A method for preparing high-performance aging-free high-carbon SWRH82B hot-rolled wire rod

Abstract

The present invention provides a method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod, which relates to the field of hot rolling technology and comprises the following steps: feeding a high-carbon SWRH82B steel billet into a heating furnace for heating; adopting a large-billion-square-bill rolling technology with a large compression ratio under heavy pressure to rough-roll the heated high-carbon SWRH82B steel billet; feeding the rough-rolled high-carbon SWRH82B steel billet into a finishing mill for finishing rolling; feeding the finished-rolled wire rod into an ultra-long air cooling line for cooling with an ultra-large air volume; feeding the cooled wire rod into a The coiling device is used for coiling; the coiled wire rod is inspected and packaged to obtain high-performance, aging-free, high-carbon SWRH82B hot-rolled wire rod. The ultra-long air cooling line adopts a 134m ultra-long air cooling line and a 280,000m³ / h ultra-large air volume fan to accelerate the cooling speed, thereby increasing the supercooling of austenite, promoting the nucleation of ferrite, refining the ferrite grains, and refining the pearlite, reducing the pearlite lamellar spacing and cementite thickness, making it easier to transform the organization into troostite, and improving the product strength and the stability of the same circle performance.

Description

Technical Field

[0001] The invention relates to the technical field of hot rolling, and in particular to a method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod. Background Art

[0002] In the field of steel smelting technology, hot rolling technology is an important processing method, which is mainly used to make steel with specific shapes and sizes by subjecting high-temperature steel billets to a series of hot rolling processes. Among them, high-carbon SWRH82B hot-rolled wire rod is a commonly used hot-rolled product, which is widely used in the manufacture of various mechanical equipment. However, the traditional preparation method of high-carbon SWRH82B hot-rolled wire rod often requires a long time for aging treatment due to the limitation of cooling speed, which not only increases production costs, but also affects production efficiency. Summary of the invention

[0003] The present invention provides a method for preparing high-performance aging-free high-carbon SWRH82B hot-rolled wire rod, which is used to solve the technical problem that the above-mentioned traditional method for preparing high-carbon SWRH82B hot-rolled wire rod often requires a long time for aging treatment due to the limitation of cooling speed, which not only increases the production cost but also affects the production efficiency.

[0004] In order to solve the above technical problems, the present invention discloses a method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod, comprising the following steps:

[0005] Step 1: Send the high carbon SWRH82B steel billet into a heating furnace for heating;

[0006] Step 2: Rough rolling the heated high-carbon SWRH82B steel billet using heavy pressure and large compression ratio rolling technology;

[0007] Step 3: sending the rough-rolled high-carbon SWRH82B steel billet to a finishing mill for finishing rolling;

[0008] Step 4: Send the finished rolled wire rod to the 134m long air cooling line and use 280000m³ / h of ultra-large air volume for cooling, so that the wire rod cooling rate is 20℃ / sec-30℃ / sec;

[0009] Step 5: Send the cooled wire rod to the coiling device for coiling;

[0010] Step 6: Inspect and package the coiled wire rod to obtain high-performance, aging-free, high-carbon SWRH82B hot-rolled wire rod.

[0011] Preferably, in step 1, the heating temperature is controlled at 1060° C.-1140° C., and the holding time is 130 minutes to ensure that the high carbon SWRH82B steel billet is completely austenitized.

[0012] Preferably, in step 2, a 240 square steel billet is used to perform rough rolling on the heated high carbon SWRH82B steel billet.

[0013] Preferably, in step 3, the finishing rolling temperature is controlled at 900°C-960°C, and after entering the sizing process, the temperature drops to 860°C-920°C, and the thickness of the rolled material after finishing rolling is 13 mm.

[0014] Preferably, the rolling device includes a shell, a collecting chamber is provided inside the shell, discharge outlets are penetrated at the left and right ends of the shell, the collecting chamber is communicated with the discharge outlet, a telescopic rod is fixedly provided at the lower end of the shell, the telescopic rod is fixedly connected to the placing table, an outer cylinder is correspondingly provided at the upper end of the placing table, the outer cylinder is fixedly arranged at the upper end of the shell, a winding chamber is provided inside the outer cylinder, a collecting roll is provided in the winding chamber, the upper part of the collecting roll is a conical part, the conical part is fixedly connected to the connecting plate through a connecting column, the connecting plate is fixedly connected to the curved baffle, and the curved baffle is fixedly arranged at the upper end of the outer cylinder.

[0015] Preferably, a guide mechanism is provided inside the winding cavity, and the guide mechanism includes grooves symmetrically arranged on the left and right sides of the winding cavity, a guide plate is rotatably provided in the groove, and a spring is fixedly provided between the groove and the guide plate, and sliding openings are symmetrically connected at the left and right ends of the winding cavity, the guide plate is rotatably connected to the spring rod, the spring rod is rotatably connected to the fixed end of the electric telescopic rod, and the fixed end of the electric telescopic rod is fixedly connected to the sliding opening.

[0016] Preferably, a fixing block is fixedly provided at the lower end of the collection drum, a fixing sleeve is fixedly provided at the lower end of the outer drum, and an annular through hole is formed between the inner through hole of the fixing sleeve and the fixing block.

[0017] Preferably, sliding holes are symmetrically provided at the left and right ends of the fixed sleeve, a sliding block is slidably provided in the sliding hole, and the lower end of the sliding hole is slidably connected to the lower end of the sliding block, the end of the sliding block away from the fixed block is fixedly connected to the connecting block, the upper end of the connecting block is fixedly connected to a damping rod, the damping rod is fixedly connected to the limit block, the limit block cooperates with the limit groove, the limit groove is communicated and arranged at the upper end of the sliding hole, the limit block is fixedly connected to the contact block through a slider, a contactor is provided at the lower end of the contact block, the contact block is slidably connected to the matching groove, the matching groove is arranged on a side of the upper end of the sliding block close to the sliding hole, a contact switch is provided at the upper end of the matching groove, the contactor and the contact switch are arranged correspondingly, and the contact switch is electrically connected to the electric telescopic rod through a controller.

[0018] Preferably, guide grooves are symmetrically provided at the upper and lower ends of the connecting block, the guide grooves are slidably connected to the arc bars, the arc bars are symmetrically arranged at the upper and lower ends of the mounting grooves, the mounting grooves are arranged at one end of the circular wheel close to the placing table, the circular wheel is fixedly connected to the rotating shaft, the rotating shaft is symmetrically arranged on the left and right sides of the upper end of the shell, the rotating shaft is fixedly connected to the gear, the gear is meshed with the rack, and the rack is fixedly connected to the movable end of the electric telescopic rod.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the process flow of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the roll collecting device of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure of the roll collecting device of the present invention;

[0024] Figure 4 It is a schematic diagram of the top view of the circular wheel structure of the present invention;

[0025] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of area A in FIG.

[0026] In the figure: 1. shell; 2. discharge outlet; 3. outer cylinder; 4. curved baffle; 5. collection drum; 6. telescopic rod; 7. collection chamber; 8. placement table; 9. rotating shaft; 10. round wheel; 11. gear; 12. coil chamber; 13. groove; 14. damping rod; 15. spring; 16. spring rod; 17. electric telescopic rod; 18. rack; 19. sliding mouth; 20. guide plate; 21. connecting column; 22. connecting plate; 23. arc strip; 24. guide groove; 25. mounting groove; 26. fixing block; 27. fixing sleeve; 28. annular through hole; 29. ​​sliding hole; 30. connecting block; 31. sliding block; 32. matching groove; 33. contact block; 34. slider; 35. limit block; 36. limit groove. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The present invention provides the following embodiments

[0030] Example 1

[0031] The embodiment of the present invention provides a method for preparing high-performance aging-free high-carbon SWRH82B hot-rolled wire rod, such as Figure 1 As shown, the following steps are included:

[0032] Step 1: Send the high carbon SWRH82B steel billet into a heating furnace for heating;

[0033] Step 2: Rough rolling the heated high-carbon SWRH82B steel billet using heavy pressure and large compression ratio rolling technology;

[0034] Step 3: sending the rough-rolled high-carbon SWRH82B steel billet to a finishing mill for finishing rolling;

[0035] Step 4: Send the finished rolled wire rod to the 134m long air cooling line and use 280000m³ / h of ultra-large air volume for cooling, so that the wire rod cooling rate is 20℃ / sec-30℃ / sec;

[0036] Step 5: Send the cooled wire rod to the coiling device for coiling;

[0037] Step 6: inspect and package the coiled wire rod to obtain high-performance, aging-free, high-carbon SWRH82B hot-rolled wire rod;

[0038] In step 1, the heating temperature is controlled at 1060°C-1140°C, and the holding time is 130 minutes to ensure that the high carbon SWRH82B steel billet is completely austenitized;

[0039] In step 2, the heated high carbon SWRH82B steel billet is rough rolled using a 240 square steel billet;

[0040] In step 3, the finishing rolling temperature is controlled at 900°C-960°C, and after entering the sizing process, the temperature drops to 860°C-920°C, and the thickness of the rolled material after finishing rolling is 13 mm.

[0041] The beneficial effects of the above technical solution are:

[0042] The heating temperature in step 1 must be strictly controlled to be between 1060°C and 1140°C, and the holding time must be 130 minutes, so as to ensure that the structure and performance of the high-carbon SWRH82B steel billet are uniform. In step 2, a 240 square steel billet is used to increase the compression ratio of the large square billet, so that the structure and performance of the high-carbon steel SWRH82B steel billet during the rolling process can be optimized, thereby improving the strength of the product and the stability of the same-circle performance. In step 3, by reducing the final rolling temperature, the structure and performance of the high-carbon steel SWRH82B steel billet during the rolling process are further optimized, the product grain size is refined, the wire rod segregation is reduced, and the product strength is improved. In step 4, the ultra-long air cooling line uses a 134m ultra-long air cooling line and a 280,000m³ / h ultra-large air volume fan to improve the cooling of the air cooling line. Ability to accelerate the cooling rate of the wire rod after fine rolling. Accelerating the cooling rate can increase the supercooling of austenite, promote the nucleation of ferrite, refine the ferrite grains, and refine the pearlite, reduce the interlamellar spacing of pearlite and the thickness of cementite, make it easier to transform the organization into sorbite, and improve the strength of the product and the stability of the same circle performance. By controlling the operation of the ultra-large air volume fan, the cooling rate of the wire rod after fine rolling is controlled at 20℃ / sec-30℃ / sec, so that the wire rod can achieve the required organization and performance without aging treatment, thereby reducing production costs and solving the problem that the traditional preparation method of high carbon SWRH82B hot-rolled wire rod often requires a long time for aging treatment due to the limitation of cooling rate, which not only increases the production cost but also affects the production efficiency.

[0043] Example 2

[0044] On the basis of Example 1, Figure 2-Figure 3 As shown, the roll collecting device includes a shell 1, a collecting chamber 7 is provided inside the shell 1, discharge ports 2 are penetrated at the left and right ends of the shell 1, the collecting chamber 7 is communicated with the discharge port 2, a telescopic rod 6 is fixedly provided at the lower end of the shell 1, the telescopic rod 6 is fixedly connected to the placement table 8, an outer cylinder 3 is correspondingly provided at the upper end of the placement table 8, the outer cylinder 3 is fixedly arranged at the upper end of the shell 1, a coiling chamber 12 is provided inside the outer cylinder 3, a collecting roll 5 is provided in the coiling chamber 12, the upper part of the collecting roll 5 is a conical part, the conical part is fixedly connected to the connecting plate 22 through a connecting column 21, the connecting plate 22 is fixedly connected to the curved baffle 4, and the curved baffle 4 is fixedly arranged at the upper end of the outer cylinder 3.

[0045] The beneficial effects of the above technical solution are:

[0046] Referring to patent CN201921742707-high-line winding device, the cooled wire rod is conveyed by the conveyor roller. When the wire rod is fed into the winding device, the head of the wire rod contacts the bending baffle 4. After losing the support of the conveyor roller, the head of the wire rod moves downward under the action of gravity, and falls into the winding chamber 12 under the guidance of the bending baffle 4. The upper part of the winding drum 5 is a conical part, and the diameter increases from top to bottom, so that the wire rod can be smoothly put on the winding drum 5 and gradually form a coil. The telescopic rod 6 is a hydraulic telescopic rod, which can drive the placement table 8 to move up and down. The placement table 8 is used to place the completed coiled wire rod.

[0047] Example 3

[0048] On the basis of Example 2, Figure 2-Figure 5 As shown, a guide mechanism is provided inside the coil chamber 12, and the guide mechanism includes grooves 13 symmetrically arranged on the left and right sides of the coil chamber 12, a guide plate 20 is rotatably provided in the groove 13, and a spring 15 is fixedly provided between the groove 13 and the guide plate 20, and a sliding opening 19 is symmetrically connected to the left and right ends of the coil chamber 12, the guide plate 20 is rotatably connected to the spring rod 16, the spring rod 16 is rotatably connected to the fixed end of the electric telescopic rod 17, and the fixed end of the electric telescopic rod 17 is fixedly connected to the sliding opening 19.

[0049] The beneficial effects of the above technical solution are:

[0050] The guide plate 20 is set, when the diameter of the coiled wire rod is larger than the diameter of the collection drum 5, the coiled wire rod will fall quickly under the action of its gravity. At the same time, if the tail of the wire rod has not completely separated from the conveying roller, it is easy for the coiled wire rod to be in an uneven state of "up and down" around the collection drum 5, which will be unfavorable for the subsequent overall packaging of the coiled wire rod. The guide plate 20 is set so that the wire rod passes between the guide plate 20 and the collection drum 5 when it falls, and When the wire rod diameter is larger than the diameter of the collecting reel 5, it will guide the falling of the wire rod, slowing down the falling speed of the coiled wire rod. The setting of the spring 15 and the spring rod 16 enables the guide plate 20 to rotate, thereby changing the gap between the guide plate 20 and the collecting reel 5, and preventing the wire rod from being stuck in the gap between the guide plate 20 and the collecting reel 5 during the falling process. When the weight of the coiled wire rod is large enough, the guide plate 20 can be pressed to rotate, preventing the coiled wire rod from being blocked in the coiling cavity 12.

[0051] Example 4

[0052] On the basis of Example 3, Figure 2-Figure 5 As shown, a fixing block 26 is fixedly disposed at the lower end of the collection drum 5, and a fixing sleeve 27 is fixedly disposed at the lower end of the outer drum 3. An annular through hole 28 is formed between the inner through hole of the fixing sleeve 27 and the fixing block 26;

[0053] The left and right ends of the fixed sleeve 27 are symmetrically provided with sliding holes 29, and a sliding block 31 is slidably provided in the sliding hole 29, and the lower end of the sliding hole 29 is slidably connected to the lower end of the sliding block 31, and the end of the sliding block 31 away from the fixed block 26 is fixedly connected to the connecting block 30, and the upper end of the connecting block 30 is fixedly connected to the damping rod 14, and the damping rod 14 is fixedly connected to the limit block 35, and the limit block 35 cooperates with the limit groove 36, and the limit groove 36 is communicated and arranged at the upper end of the sliding hole 29, and the limit block 35 is fixedly connected to the contact block 33 through the slider 34, and the lower end of the contact block 33 is provided with a contactor, and the contact block 33 is slidably connected with the matching groove 32, and the matching groove 32 is arranged on the upper end of the sliding block 31 near the sliding hole 29. A contact switch is arranged at the upper end of the matching groove 32, and the contactor and the contact switch are correspondingly arranged, and the contact switch is electrically connected to the electric telescopic rod 17 through the controller;

[0054] The upper and lower ends of the connecting block 30 are symmetrically provided with guide grooves 24, the guide grooves 24 are slidably connected to the arc strip 23, the arc strip 23 is symmetrically arranged at the upper and lower ends of the mounting groove 25, the mounting groove 25 is arranged on the rear side of one end of the circular wheel 10 close to the placement table 8, the circular wheel 10 is fixedly connected to the rotating shaft 9, the rotating shaft 9 is symmetrically arranged on the left and right sides of the upper end of the shell 1, the rotating shaft 9 is fixedly connected to the gear 11, the gear 11 is meshed with the rack 18, and the rack 18 is fixedly connected to the movable end of the electric telescopic rod 17.

[0055] The beneficial effects of the above technical solution are:

[0056] When the coiled wire rod falls on the contact block 33, the contact block 33 is driven downward by the gravity of the wire rod. When the cooled wire rod is coiled, its weight just presses the contact block 33 to move downward, and the contact block 33 drives the limit block 35 to disengage from the limit groove 36 through the slider 34. At the same time, the damping rod 14 is compressed. At this time, the contactor just contacts the contact switch, and the contact switch works, driving the electric telescopic rod 17 to extend a certain distance through the controller. The electric telescopic rod 17 drives the rack 18 to move a certain distance, so that the rack 18 drives the gear 11 to rotate exactly ninety degrees. The gear 11 drives the rotating shaft 9 to rotate, and the rotating shaft 9 drives the round wheel 10 to rotate. When the round wheel 10 rotates, it drives the arc strip 23 to rotate, and the arc strip 23 slides along the guide groove 24, thereby driving the connecting block 30 to move in the direction of the round wheel 10, and the connecting block 30 drives the sliding block 31 to disengage from the annular through hole 28. During this process, the limit block 35 is always located in the sliding hole 29, and the lower end of the sliding hole 29 is connected to the lower end of the sliding block 31 in a sliding manner in the left and right directions, which guides the movement of the sliding block 31 and the connecting block 30. After the cooled wire rod is coiled, it passes through the annular through hole 28. 8 falls on the placement table 8, and the placement table 8 is in contact with the lower end of the fixed block 26 at this time. After the placement table 8 gradually enters the collection chamber 7 as the telescopic rod 6 contracts, it is transported out through the discharge port 2 to enter the next packaging process. In the process of the telescopic rod 6 driving the placement table 8 to move upward and restore to its original position, the electric telescopic rod 17 also contracts synchronously to drive the rack 18 and the gear 11 to work in the opposite direction, and finally the sliding block 31 re-enters the annular through hole 28 and contacts the fixed block 26. At this time, the limit block 35 just moves to the corresponding position of the limit groove 36, and under the elastic action of the damping rod 14 The lower limit block 35 cooperates with the limit groove 36 to carry out the next coiling operation. The damping coefficient of the damping rod 14 is adjusted according to the weight of the coiled wire rod. The gravity of the wire rod required when the limit block 35 is separated from the limit groove 36 is adjusted to avoid the sliding block 31 being separated from the annular through hole 28 before the coiling is completed, causing the unfinished coiled wire rod to fall directly on the placement table 8, affecting the coiling effect. The settings of the contactor, contact switch and controller can realize the automatic operation of the electric telescopic rod 17, without the need for manual control of the electric telescopic rod 17, which is convenient for operation and saves time and effort.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for preparing high-performance aging-free high-carbon SWRH82B hot-rolled wire rod, characterized in that: The following steps are involved: Step 1: Send the high carbon SWRH82B steel billet into a heating furnace for heating; Step 2: Rough rolling the heated high-carbon SWRH82B steel billet using heavy pressure and large compression ratio rolling technology; Step 3: sending the rough-rolled high-carbon SWRH82B steel billet to a finishing mill for finishing rolling; Step 4: Send the finished rolled wire rod to the 134m ultra-long air cooling line and use 280,000m³ / h of ultra-large air volume for cooling, so that the wire rod cooling rate is 20℃ / second-30℃ / second; Step 5: Send the cooled wire rod to the coiling device for coiling; Step 6: inspect and package the coiled wire rod to obtain high-performance, aging-free, high-carbon SWRH82B hot-rolled wire rod; The roll collecting device comprises a shell (1), a collecting chamber (7) is provided inside the shell (1), a discharge port (2) is provided at both left and right ends of the shell (1), the collecting chamber (7) is communicated with the discharge port (2), a telescopic rod (6) is fixedly provided at the lower end of the shell (1), the telescopic rod (6) is fixedly connected to a placement table (8), an outer cylinder (3) is correspondingly provided at the upper end of the placement table (8), the outer cylinder (3) is fixedly arranged at the upper end of the shell (1), a coiling chamber (12) is provided inside the outer cylinder (3), a roll collecting cylinder (5) is provided in the coiling chamber (12), the upper part of the roll collecting cylinder (5) is a conical part, the conical part is fixedly connected to a connecting plate (22) via a connecting column (21), the connecting plate (22) is fixedly connected to a curved baffle (4), and the curved baffle (4) is fixedly arranged at the upper end of the outer cylinder (3); A fixing block (26) is fixedly provided at the lower end of the collection drum (5), a fixing sleeve (27) is fixedly provided at the lower end of the outer drum (3), and an annular through hole (28) is formed between the internal through hole of the fixing sleeve (27) and the fixing block (26).

2. The method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod according to claim 1, characterized in that: In step 1, the heating temperature is controlled at 1060°C-1140°C and the holding time is 130 minutes to ensure that the high carbon SWRH82B steel billet is completely austenitized.

3. The method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod according to claim 2, characterized in that: In step 2, the heated high carbon SWRH82B steel billet is rough rolled using a 240 square steel billet.

4. The method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod according to claim 3, characterized in that: In step 3, the finishing rolling temperature is controlled at 900°C-960°C, and after entering the sizing process, the temperature drops to 860°C-920°C, and the thickness of the rolled material after finishing rolling is 13 mm.

5. The method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod according to claim 1, characterized in that: A guide mechanism is provided inside the coiling chamber (12), the guide mechanism comprising grooves (13) symmetrically arranged on left and right sides of the coiling chamber (12), a guide plate (20) being rotatably arranged in the groove (13), and a spring (15) being fixedly arranged between the groove (13) and the guide plate (20), a sliding opening (19) being symmetrically connected at the left and right ends of the coiling chamber (12), the guide plate (20) being rotatably connected to the spring rod (16), the spring rod (16) being rotatably connected to the fixed end of the electric telescopic rod (17), and the fixed end of the electric telescopic rod (17) being fixedly connected to the sliding opening (19).

6. The method for preparing a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod according to claim 1, characterized in that: The fixed sleeve (27) is symmetrically provided with sliding holes (29) at the left and right ends, a sliding block (31) is slidably provided in the sliding hole (29), and the lower end of the sliding hole (29) is slidably connected to the lower end of the sliding block (31), the end of the sliding block (31) away from the fixed block (26) is fixedly connected to the connecting block (30), the upper end of the connecting block (30) is fixedly connected to a damping rod (14), the damping rod (14) is fixedly connected to a limit block (35), the limit block (35) cooperates with the limit groove (36), and the limit groove ( The contact block (36) is connected and arranged at the upper end of the sliding hole (29), the limit block (35) is fixedly connected to the contact block (33) through the slider (34), the lower end of the contact block (33) is provided with a contactor, the contact block (33) is slidably connected to the matching groove (32), the matching groove (32) is arranged on the upper end of the sliding block (31) close to the sliding hole (29), the upper end of the matching groove (32) is provided with a contact switch, the contactor and the contact switch are arranged correspondingly, and the contact switch is electrically connected to the electric telescopic rod (17) through a controller.

7. The method for preparing high-performance aging-free high-carbon SWRH82B hot-rolled wire rod according to claim 6, characterized in that: The connecting block (30) is symmetrically provided with guide grooves (24) at the upper and lower ends, the guide grooves (24) are slidably connected to the arc strip (23), the arc strip (23) is symmetrically arranged at the upper and lower ends of the mounting groove (25), the mounting groove (25) is arranged at one end of the round wheel (10) close to the placement table (8), the round wheel (10) is fixedly connected to the rotating shaft (9), the rotating shaft (9) is symmetrically arranged on the left and right sides of the upper end of the housing (1), the rotating shaft (9) is fixedly connected to the gear (11), the gear (11) is meshed with the rack (18), and the rack (18) is fixedly connected to the movable end of the electric telescopic rod (17).

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