A method for preventing inverted insertion of high-speed small-size hard wire steel on Stelmore air-cooled wire

Abstract

The present invention discloses a method for preventing reverse insertion of high-wire small-size hard wire steel on a Stelmore air-cooled line, comprising the following steps: (1) after the wire is rolled by a finishing mill, it is cooled by a post-rolling water tank and then fed to a spinning machine through a pinch roller; (2) the spinning machine bends the wire into a coil and simultaneously converts the high-speed linear motion into a low-speed linear motion along the axis direction, and in this process controls the outlet angle of the spinning tube of the spinning machine, adjusts the height of the lower support plate of the spinning machine, and optimizes the overspeed of the spinning machine; (3) after the coil is spit out by the spinning machine, it falls on the Stelmore air-cooled line, and several sections of cooling rollers are arranged on the Stelmore air-cooled line to transport the coil forward, and after rapid cooling by blowing air to cause phase change, it is transported to a collection drum for collection and coiling, and in this process, the chain transmission speed is improved, the cooling roller speed is adjusted, and the receiving roller height is changed, thereby realizing reverse insertion prevention. The present invention realizes reverse insertion prevention and ensures stability on the Stelmore air-cooled line.

Description

Technical Field

[0001] The invention relates to the technical field of hard wire steel production, and in particular to a method for preventing inverted insertion of high-wire small-size hard wire steel on a Stelmor air-cooled line. Background Art

[0002] The production of high-speed small-size hard wire steel is prone to inversion on the Stelmor air-cooled line. After the wire is spun, it is quickly cooled to about 600°C by blowing air through the cooling roller to obtain a sorbite structure that is conducive to drawing. However, in actual production, coils frequently invert during transportation on the cooling line, resulting in a large number of unqualified products and affecting the continuity of production, which in turn leads to a decrease in the production line operation rate and yield rate. Therefore, it has become an urgent problem to study a control method to improve the stability of the Stelmor air-cooled line for the production of high-speed small-size hard wire steel. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for preventing the back-insertion of high-wire and small-size hard wire steel on the Stelmor air-cooling line. The method prevents the back-insertion by controlling the outlet throw angle of the spinning tube, adjusting the height of the lower support plate of the spinning machine, optimizing the overspeed of the spinning machine, improving the chain transmission speed, adjusting the speed of the cooling roller, and changing the height of the receiving roller, thereby ensuring the stability of the high-wire and small-size hard wire steel on the Stelmor air-cooling line and improving the quality of the finished product.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a method for preventing inversion of high-wire small-size hard wire steel on a Stelmor air-cooled line of the present invention has the following innovative features:

[0005] (1) After the wire is rolled into a finished round shape by the finishing mill, it is cooled by the post-rolling water tank and then fed to the laying head by the pinch rollers in a full-process pinching manner;

[0006] (2) The laying machine bends the wire into a coil of a certain diameter, and at the same time converts the high-speed linear motion before bending into a low-speed linear motion along the axis after bending. In this process, the horizontal velocity component of the coil outlet is controlled by controlling the outlet pitch angle of the laying machine's laying tube, and the inclination angle of the coil when it falls is controlled by adjusting the height of the lower support plate of the laying machine. The horizontal velocity component of the coil is controlled by overspeed optimization of the laying machine, and the angle of the coil when it falls is controlled to be consistent with the receiving roller.

[0007] In the above steps, the pitch angle of the spinning tube outlet of the spinning machine affects the axial speed of the coil outlet, and the axial speed of the coil outlet is:

[0008] V a =V×sinα (1)

[0009] Where Va is the axial speed of the coil outlet; V is the speed of the wire entering the spinning machine; α is the spinning tube outlet throw angle of the spinning machine, and its value is 0.2~0.8°;

[0010] Install the top wire on the last clip of the spinning plate of the spinning machine, and adjust the spinning tube outlet angle of the spinning machine according to different specifications;

[0011] The horizontal velocity at the coil outlet is:

[0012] V x =V a ×cosβ (2)

[0013] Where V x V is the horizontal velocity at the coil outlet; a is the axial speed at the coil outlet; β is the inclination angle of the spinning machine;

[0014] The receiving roller speed V of the Stelmor air cooling line 辊 <V x ;

[0015] In the above steps, after the coil leaves the deflection guide groove of the spinning machine, before falling onto the receiving roller of the Stelmor air-cooling line, it will first fall on the lower support plate of the spinning machine, giving a friction force to the lower end of the coil, thereby reducing the axial speed of the coil when it leaves the spinning machine, so that the coil can be smoothly tilted onto the receiving roller. Therefore, the height of the lower support plate of the spinning machine is controlled at 0.2-0.25m from the receiving roller, thereby controlling the inclination angle of the coil when it falls to 20-30°;

[0016] In the above steps, the speed of the laying machine is overspeeded relative to the finishing mill. The size of the overspeed determines the size of the laying machine's spinning coil. Therefore, the laying machine overspeed is optimized to -0.8 to -0.2 m / s. At this time, the laying machine outlet coil is biased to the left, and its diameter is controlled at 1075 mm. It first rubs against the left support plate of the laying machine, and then contacts the stop block of the lower support plate of the laying machine, thereby reducing the horizontal speed component of the coil, so that the angle of the coil when falling is consistent with the receiving roller.

[0017] (3) After being spitted out by the spinning machine, the coil falls on the Stelmore air-cooling line. Several sections of cooling rollers are arranged on the Stelmore air-cooling line. Each section of cooling rollers is composed of several rollers, which are driven by chain transmission respectively. The first section of rollers on the Stelmore air-cooling line is a receiving roller, which conveys the coil forward. After being rapidly cooled by blowing air to undergo phase change, the coil is conveyed to the collection drum for collection and winding. In this process, the chain transmission speed is improved to ensure that the speed of the roller on the rear side of the same cooling roller is less than the speed of the roller on the front side. The speed of the cooling roller is adjusted to ensure that the speed of the cooling roller on the rear side is less than the speed of the cooling roller on the front side. The height of the receiving roller is changed to reduce the bouncing of the coil when it falls, thereby achieving anti-inversion.

[0018] In the above steps, the specific method to improve the chain drive speed is: change the forward main drive chain teeth of the motor to large teeth, thereby increasing the transmission speed of the roller in front of the motor to compensate for the speed drop caused by periodic fluctuations; at the same time, according to the cooling uniformity of the overlap point of the fast-cooled steel grade, increase the coil speed at the large tooth position in the middle of the roller to double the overlap misalignment point.

[0019] Preferably, in the above step (1), the clamping roller adopts a full-course clamping mode, and the clamping head can ensure that the wire head can stably enter the spinning machine, reduce shaking during the clamping process, and thus reduce scratches and damage to quality; the clamp tail is a high clamp, and its torque is greater than the torque at the wire head and the middle position. It is used after the wire tail leaves the finishing mill to ensure that the wire tail enters the spinning machine stably, avoiding the occurrence of wire tail tailing and tangled circles.

[0020] Preferably, in the above step (3), the chain drive formula is:

[0021]

[0022] Where i is the transmission ratio; N1 is the speed of the small sprocket; Z1 is the number of teeth on the small sprocket; N2 is the speed of the large sprocket; Z2 is the number of teeth on the large sprocket.

[0023] Preferably, in the above step (3), the speed of the cooling roller is adjusted to ensure that the speed of the cooling roller in the rear section is less than that of the cooling roller in the front section. At the same time, the speed of the cooling roller, the number of fans opened and the air volume, and the number of insulation covers opened determine the effect of controlled cooling after wire rolling. Therefore, the speed setting range of each section of the cooling roller is:

[0024]

[0025] Preferably, in the above step (3), the distance between the receiving roller and the bottom of the spinning machine is controlled at 0.15-0.30 m, and then the bounce of the coil when it falls is reduced by changing the height of the receiving roller, so that the coil can fall on the receiving roller according to the order after being spit out by the spinning machine.

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention prevents reverse insertion by controlling the outlet pitch angle of the spinning tube, adjusting the height of the lower support plate of the spinning machine, optimizing the overspeed of the spinning machine, improving the chain transmission speed, adjusting the speed of the cooling roller, and changing the height of the receiving roller, thereby ensuring the stability of high-line small-size hard wire steel on the Stelmor air-cooled line, thereby improving the quality of the finished product;

[0028] (2) The present invention controls the horizontal velocity of the coil outlet by controlling the outlet pitch angle of the spinning tube of the spinning machine, thereby avoiding the occurrence of tail-breaking accidents or forward ejection;

[0029] (3) The present invention controls the inclination angle of the coil when it falls by adjusting the height of the lower support plate of the spinning machine, thereby preventing the coil from failing to flip normally and causing the lower end to fall on the receiving roller first and bounce;

[0030] (4) The present invention controls the horizontal velocity component of the coil by optimizing the overspeed of the spinning machine, and controls the angle of the coil when it falls to be consistent with the receiving roller, thereby preventing the formation of reverse insertion due to uneven distribution;

[0031] (6) The present invention improves the chain drive speed to ensure that the speed of the roller on the rear side of the same cooling roller is less than the speed of the roller on the front side, thereby avoiding the occurrence of the reverse insertion phenomenon caused by the rear coil exceeding the front coil;

[0032] (7) The present invention adjusts the cooling roller speed to ensure that the cooling roller speed at the rear section is less than the cooling roller speed at the front section, thereby avoiding the occurrence of the reverse insertion phenomenon caused by the rear coil exceeding the front coil;

[0033] (8) The present invention reduces the bouncing of the coil when it falls by changing the height of the receiving roller, so that the coil can fall on the receiving roller according to the order after being spit out by the spinning machine, and the phenomenon of the rear coil exceeding the front coil will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a schematic diagram of the process of wire rod from the finishing mill to the collection drum in the present invention.

[0036] Figure 2 This is the coil outlet velocity analysis diagram of the present invention.

[0037] Figure 3 This is an axial velocity analysis diagram of the coil outlet of the present invention.

[0038] Figure 4 It is a schematic diagram of the position of the support plate of the spinning machine of the present invention.

[0039] Figure 5 It is a schematic diagram of the progress of the wire of the present invention on the Stelmor air-cooling line.

[0040] Figure 6 This is a schematic diagram of the state before the chain transmission speed is improved according to the present invention.

[0041] Figure 7This is a schematic diagram of the state after the chain transmission speed is improved according to the present invention.

[0042] Among them, 1-finishing mill; 2-pinch roll; 3-air blowing; 4-laying machine; 5-Stelmor air cooling line; 6-collecting drum. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0044] The invention discloses a method for preventing reverse insertion of high-speed small-size hard wire steel on a Stelmor air-cooled wire, which is used for Specification 35# steel, such as Figures 1 to 7 As shown, the following steps are included:

[0045] (1) The finishing mill 1 is the last process to control the size of the finished product. After the wire rod is rolled into a finished round shape by the finishing mill 1, it is cooled by a post-rolling water tank to control the spinning temperature within the process range, and then it is sent to the spinning machine 4 by the pinch roller 2 in a full-process pinching manner;

[0046] In the above steps, the clamping roller 2 adopts the full-course clamping mode, and the clamping head can ensure that the wire head can stably enter the spinning machine 4, reduce the shaking during the clamping process, and thus reduce the scratches and damage to the quality; the clamp tail is a high clamp, and its torque is greater than the torque at the wire head and the middle position. It is used after the wire tail is separated from the finishing mill 1, because the wire will lose force after leaving the finishing mill 1, thereby ensuring that the wire tail can stably enter the spinning machine 4, avoiding the phenomenon of wire tail tail and chaotic circle.

[0047] (2) The spinning machine 4 bends the wire into a coil of a certain diameter, and at the same time converts the high-speed linear motion before bending into a low-speed linear motion along the axis after bending, so as to realize the collection of high-speed wire. The wire passes through the spinning machine 4 in sequence, including the spinning inlet guide groove, the spinning tube assembly, the deflection guide groove assembly, the support plate assembly, etc., and in this process, the horizontal component speed of the coil outlet is controlled by controlling the spinning tube outlet throw angle of the spinning machine 4, the inclination angle of the coil when falling is controlled by adjusting the height of the lower support plate of the spinning machine 4, the horizontal speed component of the coil is controlled by overspeed optimization of the spinning machine 4, and the angle of the coil when falling is controlled to be consistent with the receiving roller; the specific method is as follows:

[0048] (2.1) Control the outlet throw angle of the spinning tube of the spinning machine 4: the horizontal speed of the coil is related to the inlet speed of the wire, the throw angle of the spinning tube, and the right end of the support plate of the spinning machine 4. The size of the throw angle of the spinning tube outlet of the spinning machine 4 affects the axial speed of the coil outlet. If the throw angle is too small, the wire will be close to the spinning disk surface after being spit out, and it is easy to hook with the spinning disk surface, and then a tail accident will occur; if the throw angle is too large, the forward speed of the wire will be too high after being spit out, and it is easy to rush forward; so the axial speed of the coil outlet is:

[0049] V a =V×sinα (1)

[0050] Where V a is the axial speed of the coil outlet; V is the speed of the wire entering the spinning machine 4, and its value is 115m / s; α is the spinning tube outlet throw angle of the spinning machine 4, and its value is 0.2-0.8°, here α=0.4°, then V a =0.80m / s;

[0051] Install the top wire on the last clip of the spinning disk of the spinning machine 4, and adjust the spinning tube outlet angle of the spinning machine 4 according to different specifications;

[0052] The horizontal velocity at the coil outlet is:

[0053] V x =V a ×cosβ (2)

[0054] Where V x V is the horizontal velocity at the coil outlet; a is the axial speed of the coil outlet; β is the inclination angle of the spinning machine 4, and its value is 30°, then V x =0.70m / s=42m / min;

[0055] When hard wire steel is produced, the receiving roller speed on the Stelmor air cooling line 5 is V 辊 =40~42m / min <V x , which is generally set to V 辊 =42m / min.

[0056] The present invention controls the horizontal velocity component of the coil outlet by controlling the outlet pitch angle of the spinning tube of the spinning machine 4, thereby avoiding the occurrence of tail-breaking accidents or forward ejection.

[0057] (2.2) Adjusting the height of the lower support plate of the spinning machine 4: After the coil leaves the deflection guide groove of the spinning machine 4, it will first fall on the lower support plate of the spinning machine 4 before falling on the receiving roller of the Stelmor air-cooled wire 5, giving the lower end of the coil a friction force, thereby reducing the axial speed of the coil when leaving the spinning machine 4, so that the coil can be smoothly tilted onto the receiving roller; when the present invention produces high-wire and small-size hard wire steel, the lower support plate of the spinning machine 4 is relatively low, and the lower end of the coil first falls on the receiving roller, and the coil still has The inclination angle is 30-45°. If the lower support plate of the laying machine 4 is too low, the coil cannot be turned over normally, and the lower end falls on the receiving roller first and bounces. Therefore, the height of the lower support plate of the laying machine 4 is controlled at a distance of 0.2-0.25m from the receiving roller, and the inclination angle of the coil when it falls is controlled at 20-30°; here, the height of the lower support plate of the laying machine 4 is controlled at a distance of 0.23m from the receiving roller, and the inclination angle of the coil when it falls is controlled at about 25°. The present invention controls the inclination angle of the coil when it falls by adjusting the height of the lower support plate of the laying machine 4, thereby avoiding the phenomenon that the coil cannot be turned over normally, and the lower end falls on the receiving roller first and bounces.

[0058] (2.3) Optimization of overspeed of the spinning machine 4: The speed of the spinning machine 4 is overspeed relative to the finishing mill 1. The overspeed determines the size of the spinning coil of the spinning machine 4. If the coil is too large or too small, the coil will be unevenly distributed after being spit out, which is easy to form an inverted insertion. Therefore, the overspeed optimization of the spinning machine 4 is reduced from +0.5~1.2m / s to -0.8~-0.2m / s. Here, the overspeed of the spinning machine 4 is controlled to -0.8m / s, so that the coil diameter is controlled at about 1075mm, and the coil is spit out more stably; at this time, the outlet coil of the spinning machine 4 is biased to the left, first rubbed lightly with the left support plate of the spinning machine 4, and then contacted with the lower support plate stop block of the spinning machine 4, thereby reducing the horizontal velocity component of the coil, so that the angle of the coil when falling is consistent with the receiving roller. The present invention controls the horizontal velocity component of the coil through the overspeed optimization of the spinning machine 4, and controls the angle of the coil when falling to be consistent with the receiving roller, thereby preventing the formation of an inverted insertion due to uneven distribution.

[0059] (3) The Stelmore air cooling line 5 (scattering cooling line) is a controlled cooling process designed based on the transformation law of the structure of steel during cooling. Together with the controlled cooling after rolling, it is a key process for controlling the structure and performance of the wire rod. The coil of the present invention falls on the Stelmore air cooling line 5 after being spit out by the wire laying machine 4. 20 sections of scattering cooling rollers are arranged on the Stelmore air cooling line 5. Each section of scattering cooling rollers is composed of several sections of rollers and is driven by chain transmission respectively. The first section of rollers on the Stelmore air cooling line 5 is a receiving roller, and its height can be adjusted to control the stability of the coil when it falls.

[0060] The coil is transported forward through the Stelmore air cooling line 5, and after being rapidly cooled by air blowing to undergo phase change, it is transported to the collection roll 6 for collection and coiling. In this process, the chain transmission speed is improved to ensure that the speed of the rear roller on the same section of the cooling roller is less than the speed of the front roller. The cooling roller speed is adjusted to ensure that the speed of the rear cooling roller is less than the speed of the front cooling roller. The height of the receiving roller is changed to reduce the bouncing of the coil when it falls, thereby achieving anti-inversion. Among them,

[0061] (3.1) The specific method of improving the chain drive speed is: change the main drive chain teeth of the motor forward to large teeth, thereby increasing the transmission speed of the roller in front of the motor to compensate for the speed drop caused by periodic fluctuations; at the same time, considering the cooling uniformity of the overlap point of fast-cooling steel types such as hard wire steel, increase the coil speed at the large tooth position in the middle of the roller to double the overlap misalignment point;

[0062] The chain transmission formula is:

[0063]

[0064] Where i is the transmission ratio; N1 is the speed of the small sprocket; Z1 is the number of teeth on the small sprocket; N2 is the speed of the large sprocket; Z2 is the number of teeth on the large sprocket;

[0065] According to the chain assembly standard, the chain droop length is controlled within one pitch. If the number of teeth on the small sprocket is Z1=14, the large teeth are increased by one pitch to 15, which can compensate for the speed fluctuation caused by speed fluctuation;

[0066] φ6.5mm hard wire sets the roller speed V1 = 60m / min, increases the speed △V = 3 ~ 7m / min, then

[0067]

[0068] Take Z2=15, that is, determine the number of teeth of the large gear to be 15, and then determine the number of teeth of the inner gear of the roller transmission to be 15, and the number of teeth of the outer gear to be 14.

[0069] The present invention improves the chain drive speed to ensure that the speed of the roller on the rear side of the same section of the cooling roller is less than the speed of the roller on the front side, thereby avoiding the occurrence of the reverse insertion phenomenon caused by the rear coil exceeding the front coil. (3.2) Adjust the cooling roller speed to ensure that the speed of the cooling roller on the rear section is less than the speed of the cooling roller on the front section. At the same time, the speed of the cooling roller, the number of fans opened and the air volume, and the number of insulation covers opened determine the effect of wire rod post-rolling cooling control. Therefore, the speed setting range of each cooling roller is:

[0070]

[0071]

[0072] The present invention ensures that the speed of the cooling roller at the rear section is less than that of the cooling roller at the front section by adjusting the speed of the cooling roller, thereby avoiding the occurrence of the reverse insertion phenomenon caused by the rear coil exceeding the front coil.

[0073] The last three sections of the Stelmor air cooling line 5 of the present invention are drop sections, which are conducive to the final collection into rolls. The 26 heat-insulating covers, 9 fans, the speed control of each roller, the number and position of the heat-insulating covers opened, the number, position and air volume of the fans opened jointly control the cooling process of the cooling to ensure that the mechanical properties of the final product are qualified.

[0074] (3.3) When producing small specifications, the greater the distance between the outlet of the laying machine 4 and the receiving roller, the greater the impact with the receiving roller, which easily causes the coil to bounce on the receiving roller, converting the falling speed and increasing the horizontal speed of the coil. Therefore, when the wire laying speed is higher, that is, when rolling small specifications, the distance between the receiving roller and the bottom of the laying machine 4 is controlled at 0.15-0.30m. Here, the distance is controlled at 0.20m, and then the height of the receiving roller is changed to reduce the bounce of the coil when it falls, so that the coil can fall on the receiving roller according to the order after the laying machine 4 spits out, and the phenomenon of the rear coil exceeding the front coil will not occur.

[0075] Beneficial effects of the present invention:

[0076] (1) The present invention prevents reverse insertion by controlling the outlet pitch angle of the spinning tube, adjusting the height of the lower support plate of the spinning machine 4, optimizing the overspeed of the spinning machine 4, improving the chain transmission speed, adjusting the speed of the cooling roller, and changing the height of the receiving roller, thereby ensuring the stability of the high-line small-size hard wire steel on the Stelmor air-cooled line 5, thereby improving the quality of the finished product;

[0077] (2) The present invention controls the horizontal velocity component of the coil outlet by controlling the outlet pitch angle of the spinning tube of the spinning machine 4, thereby avoiding the occurrence of tail-breaking accidents or forward ejection;

[0078] (3) The present invention controls the inclination angle of the coil when it falls by adjusting the height of the lower support plate of the spinning machine 4, thereby avoiding the phenomenon that the coil cannot be turned over normally and the lower end falls on the receiving roller first and bounces;

[0079] (4) The present invention controls the horizontal velocity component of the coil by optimizing the overspeed of the laying head 4, and controls the angle of the coil when it falls to be consistent with the receiving roller, thereby preventing the formation of reverse insertion due to uneven distribution;

[0080] (6) The present invention improves the chain drive speed to ensure that the speed of the roller on the rear side of the same cooling roller is less than the speed of the roller on the front side, thereby avoiding the occurrence of the reverse insertion phenomenon caused by the rear coil exceeding the front coil;

[0081] (7) The present invention adjusts the cooling roller speed to ensure that the cooling roller speed at the rear section is less than the cooling roller speed at the front section, thereby avoiding the occurrence of the reverse insertion phenomenon caused by the rear coil exceeding the front coil;

[0082] (8) The present invention reduces the bouncing of the coils when they fall by changing the height of the receiving roller, so that the coils can fall on the receiving roller in the order in which they are spit out by the spinning machine 4, and the phenomenon that the rear coils exceed the front coils will not occur.

[0083] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A method for preventing inverted insertion of high-speed small-size hard wire steel on Stelmor air-cooled wire, characterized in that The following steps are involved: (1) After the wire is rolled into a finished round shape by the finishing mill, it is cooled by the post-rolling water tank and then fed to the laying head by the pinch rollers in a full-process pinching manner; (2) The laying machine bends the wire into a coil of a certain diameter, and at the same time converts the high-speed linear motion before bending into a low-speed linear motion along the axis after bending. In this process, the horizontal velocity component of the coil outlet is controlled by controlling the outlet pitch angle of the laying machine's laying tube, and the inclination angle of the coil when it falls is controlled by adjusting the height of the lower support plate of the laying machine. The horizontal velocity component of the coil is controlled by overspeed optimization of the laying machine, and the angle of the coil when it falls is controlled to be consistent with the receiving roller. In the above steps, the pitch angle of the spinning tube outlet of the spinning machine affects the axial speed of the coil outlet, and the axial speed of the coil outlet is: In a =V×sinα (1) Where V a is the axial speed of the coil outlet; V is the speed of the wire entering the spinning machine; α is the spinning tube outlet throw angle of the spinning machine, and its value is 0.2~0.8°; Install the top wire on the last clip of the spinning plate of the spinning machine, and adjust the spinning tube outlet angle of the spinning machine according to different specifications; The horizontal velocity at the coil outlet is: V x =V a ×cosβ(2) Where V x V is the horizontal velocity at the coil outlet; a is the axial speed at the coil outlet; β is the inclination angle of the spinning machine; The receiving roller speed V of the Stelmor air cooling line 辊 <V x ; In the above steps, after the coil leaves the deflection guide groove of the spinning machine, before falling onto the receiving roller of the Stelmor air-cooling line, it will first fall on the lower support plate of the spinning machine, giving a friction force to the lower end of the coil, thereby reducing the axial speed of the coil when it leaves the spinning machine, so that the coil can be smoothly tilted onto the receiving roller. Therefore, the height of the lower support plate of the spinning machine is controlled at 0.2-0.25m from the receiving roller, thereby controlling the inclination angle of the coil when it falls to 20-30°; In the above steps, the speed of the laying machine is overspeeded relative to the finishing mill. The size of the overspeed determines the size of the laying machine's spinning coil. Therefore, the laying machine overspeed is optimized to -0.8 to -0.2 m / s. At this time, the laying machine outlet coil is biased to the left, and its diameter is controlled at 1075 mm. It first rubs against the left support plate of the laying machine, and then contacts the stop block of the lower support plate of the laying machine, thereby reducing the horizontal speed component of the coil, so that the angle of the coil when falling is consistent with the receiving roller. (3) After being spitted out by the spinning machine, the coil falls on the Stelmore air-cooling line. Several sections of cooling rollers are arranged on the Stelmore air-cooling line. Each section of cooling rollers is composed of several rollers, which are driven by chain transmission respectively. The first section of rollers on the Stelmore air-cooling line is a receiving roller, which conveys the coil forward. After being rapidly cooled by blowing air to undergo phase change, the coil is conveyed to the collection drum for collection and winding. In this process, the chain transmission speed is improved to ensure that the speed of the roller on the rear side of the same cooling roller is less than the speed of the roller on the front side. The speed of the cooling roller is adjusted to ensure that the speed of the cooling roller on the rear side is less than the speed of the cooling roller on the front side. The height of the receiving roller is changed to reduce the bouncing of the coil when it falls, thereby achieving anti-inversion. In the above steps, the specific method to improve the chain drive speed is: change the forward main drive chain teeth of the motor to large teeth, thereby increasing the transmission speed of the roller in front of the motor to compensate for the speed drop caused by periodic fluctuations; at the same time, according to the cooling uniformity of the overlap point of the fast-cooled steel grade, increase the coil speed at the large tooth position in the middle of the roller to double the overlap misalignment point.

2. The method for preventing inverted insertion of high-speed small-size hard wire steel on Stelmor air-cooled wire according to claim 1, characterized in that: In the above step (1), the clamping roller adopts the full-course clamping mode, and the clamp head can ensure that the wire head can stably enter the spinning machine, reduce the shaking during the clamping process, and thus reduce the scratch damage to the quality; the clamp tail is a high clamp, and its torque is greater than the torque at the wire head and the middle position. It is used after the wire tail leaves the finishing mill to ensure that the wire tail enters the spinning machine stably, avoiding the occurrence of wire tail tail and tangled circles.

3. The method for preventing inverted insertion of high-speed small-size hard wire steel on Stelmor air-cooled wire according to claim 1, characterized in that: In the above step (3), the chain drive formula is: Where i is the transmission ratio; N1 is the speed of the small sprocket; Z1 is the number of teeth on the small sprocket; N2 is the speed of the large sprocket; Z2 is the number of teeth on the large sprocket.

4. The method for preventing inverted insertion of high-speed small-size hard wire steel on Stelmor air-cooled wire according to claim 1, characterized in that: In the above step (3), the speed of the cooling roller is adjusted to ensure that the speed of the cooling roller in the rear section is less than that of the cooling roller in the front section. At the same time, the speed of the cooling roller, the number of fans opened and the air volume, and the number of insulation covers opened determine the effect of the wire rod post-rolling cooling control. Therefore, the speed setting range of each section of the cooling roller is: 。 5. The method for preventing inverted insertion of high-speed small-size hard wire steel on Stelmor air-cooled wire according to claim 1, characterized in that: In the above step (3), the distance between the receiving roller and the bottom of the spinning machine is controlled at 0.15-0.30m, and then the bounce of the coil when it falls is reduced by changing the height of the receiving roller, so that the coil can fall on the receiving roller according to the order after being spit out by the spinning machine.

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