CN109396182B - Multi-line bar cutting production line - Google Patents
Multi-line bar cutting production line Download PDFInfo
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- CN109396182B CN109396182B CN201811344652.1A CN201811344652A CN109396182B CN 109396182 B CN109396182 B CN 109396182B CN 201811344652 A CN201811344652 A CN 201811344652A CN 109396182 B CN109396182 B CN 109396182B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention provides a bar multi-line cutting production line, which comprises the following steps: a first section of guide groove before the 3# flying shears and a second section of guide groove before the 3# flying shears; the second section of guide groove in front of the 3# flying shear is provided with a variable frequency support roller way; the frequency conversion support roller way comprises: the variable frequency motor and the backing roll of connection variable frequency motor, variable frequency motor sets up on the lateral wall of second section guide slot before the 3# flying shear, is formed with the opening between the two lateral walls of second section guide slot before the 3# flying shear, the backing roll sets up in the opening. According to the invention, the situation that the steel subjected to multi-line cutting is askew after being cut by the 3# flying shears is changed, the running stability is improved, the possibility that the steel head is impacted and deformed in a channel is reduced, and finally, the situation that the steel is blocked due to the fact that the steel is caught on a movable apron board and flies out of a steel on a rear end is avoided.
Description
Technical Field
The invention relates to the field of steel rolling, in particular to a bar multi-line splitting rolling device, namely a bar multi-line splitting production line.
Background
The hot rolled ribbed steel bar is commonly called screw thread steel and is widely applied to buildings such as houses, bridges, roads and the like. Currently, threaded steel is produced by single line or single line, and is developed into multi-line splitting production, namely, one large threaded steel is split into a plurality of small threaded steels on a rolling mill to be rolled, the multi-line splitting production is several times of the single line or single line production efficiency, for example, two splitting is to split one large threaded steel into two small threaded steels to be rolled, four splitting is to split one large threaded steel into four small threaded steels to be rolled, in theory, two splitting is twice of the single line or single line production efficiency, and four splitting is four times of the single line or single line production efficiency.
In multi-line cutting production, after passing through a finishing mill, the finished steel is transversely cut into a plurality of steel branches, each steel branch can reach hundreds of meters in length, then enters a 3# fly shearing multiple length, is longitudinally sheared into lengths of about tens of meters, and then enters a cooling bed. After 3# flying shear divides the length to multiple, can appear the regular walking of current steel branch in the passageway after shearing in same passageway after shearing, and the irregular walking swing of some steel branch in passageway after shearing (for example in the second section guide slot behind 3# flying shear or other 3# flying shear other positions's guide slot behind), this phenomenon has greatly influenced the stability of steel branch in the passageway before last cooling bed, easily causes skirt steel branch rear-end collision to block up the steel, influences the normal travel of follow-up quick steel branch that comes to cause in the passageway before going up the cooling bed disordered steel, form the waste product, influence the production of whole roll line moreover.
In summary, the following problems exist in the prior art: and when the bar is rolled and multi-line cut, the finished steel runs and is inclined after passing through the 3# flying shears.
Disclosure of Invention
The invention provides a bar multi-line cutting production line, and aims to improve the running flatness of a steel head (the head of a steel support) after 3# cutting and dividing multiple length.
To this end, the invention proposes a multi-line bar cutting line comprising:
the finishing mill group, the water cooling device, the 3# flying shear front guide groove, the 3# flying shear rear guide groove and the cooling bed are sequentially connected; the bar steel branch is subjected to multi-line splitting on a finishing mill group; the water cooling device is a pipeline structure with openings at two ends;
the 3# flying shear front guide groove comprises: the guide groove of the first section of the 3# flying shear and the guide groove of the second section of the 3# flying shear are sequentially connected; the length of the second section of guide groove before the 3# flying shear is longer than that of the first section of guide groove before the 3# flying shear; the first section of guide groove of the 3# flying shear is in a horn mouth shape; the second section guide slot before the 3# flying shears comprises: a rectangular main guide groove and a conical auxiliary guide groove connected with the rectangular main guide groove; the outlet of the rectangular main guide groove extends into the inlet of the first section guide groove of the 3# flying shear;
the first section of guide groove in front of the 3# flying shear is close to the 3# flying shear, and the second section of guide groove in front of the 3# flying shear is far away from the 3# flying shear; the first section of guide groove before the 3# flying shear is positioned between the 3# flying shear and the second section of guide groove before the 3# flying shear;
the second section guide groove in front of the 3# flying shear is provided with two side walls and a bottom wall arranged between the two side walls, and a variable frequency support roller way is arranged in the second section guide groove in front of the 3# flying shear; the frequency conversion support roller way comprises: the frequency conversion motor and the backing roll of connection frequency conversion motor, frequency conversion motor sets up on the lateral wall of second section guide slot before the 3# flying shear, is formed with the opening between two lateral walls of second section guide slot before the 3# flying shear, the backing roll sets up in the opening, the axis of backing roll is parallel to the diapire of second section guide slot before the 3# flying shear.
Further, the support roller is arranged on the side wall of the rectangular main guide groove.
Further, the number of the supporting rollers is two, namely a supporting roller at the head end and a supporting roller at the tail end, and the supporting roller at the head end is positioned between the 3# flying shears and the supporting roller at the tail end.
Further, the distance between the two supporting rollers is 1 meter.
Further, the distance between the support roller at the head end and the shearing center of the 3# flying shear is 1550mm to 1750mm.
Further, the support roller at the head end is 450mm to 550mm from the front edge of the rectangular main guide groove.
Further, a first section of guide groove behind the 3# flying shears and a second section of guide groove behind the 3# flying shears are sequentially connected, the first section of guide groove behind the 3# flying shears is in a horn mouth shape, the second section of guide groove behind the 3# flying shears is provided with the variable frequency support roller way, and the length of the second section of guide groove behind the 3# flying shears is more than ten times of that of the second section of guide groove in front of the 3# flying shears.
Further, the finishing mill group is provided with a rolling groove for dividing four lines of bar steel branches, and four bar steel branches are conveyed through a second section of guide groove before the 3# flying shears.
Further, the size of the supporting roller is phi 180mm multiplied by 380mm; the model of the variable frequency motor: YVP100L2-4, p=2.2 KW; the transmission mode is as follows: alternating current frequency conversion, independent transmission and continuous forward running.
Further, the model of the motor adopted by the 3# flying shears is Z355-6C, the rated power is 355KW, the linear speed of the shearing edge of the 3# flying shears exceeds the running speed of the steel branch of the bar by 2-10%, and the turning radius is as follows: 505mm, the speed of the bar steel branch entering the conical auxiliary guide groove of the second section guide groove before the 3# flying shear is 10-18 m/s, and the length of the bar steel branch after shearing is 84-108 m.
The invention uses the additional speed of the newly added (variable frequency) supporting roller to forcefully support the head of the steel support after cutting the multiple length, so as to improve the travelling linearity and stability of the steel support after cutting. According to the invention, the situation that the steel subjected to multi-line cutting is askew after being cut by the 3# flying shears is changed, the running stability is improved, the possibility that the steel head is impacted and deformed in a channel is reduced, and finally, the situation that the steel is blocked due to the fact that the steel is caught on a movable apron board and flies out of a steel on a rear end is avoided.
Drawings
Fig. 1 is a schematic structural view of a 3# flying shear and front and rear guide grooves of a bar multi-line cutting production line of the invention;
FIG. 2 is a schematic front view of a second section of guide slot of the 3# flying shear of the present invention;
FIG. 3 is a schematic top view of a second section of guide slot of the 3# flying shear of the present invention;
fig. 4 is a schematic diagram of the whole structure of the bar multi-line cutting production line of the present invention.
Reference numerals illustrate:
1. the first section of guide groove in front of the 3# flying shears; 2. the second section of guide groove in front of the 3# flying shears; 21. a main guide groove; 22. a tapered auxiliary guide groove;
3. the travelling direction of the bar steel branch; 4. 3# flying shears; 25. a variable frequency support roller way; 251. a variable frequency motor; 252. a support roller; 253. a variable frequency roll surface horizontal line; 5. a first section of guide groove behind the 3# flying shears; 6. a second section of guide groove behind the 3# flying shears; 7. a water cooling device; 8. a finishing mill group; 9. and (5) a cooling bed.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, the present invention will be described with reference to the accompanying drawings.
1. Principle and problem analysis:
in daily production, the rolling line of the applicant often appears after 3# flying shear is divided into multiple lengths, and in the same post-shear channel, the problem that the existing steel support regularly walks in the post-shear channel and the existing steel support irregularly walks and swings in the post-shear channel can occur.
For this problem, applicant has not solved it. Because the same blank is subjected to the same heating, blooming, finish rolling and cutting into 4 steel bars on the same rolling mill, then sequentially and simultaneously enters the first section guide groove before the same 3# flying shear and the second section guide groove before the same 3# flying shear through the same water cooling device, and sequentially and simultaneously enters the first section guide groove after the same 3# flying shear and the second section guide groove after the same 3# flying shear through the 3# flying shear, at the moment, irregular walking swing of some steel bars in a rear-cut channel occurs, so that the problems of rear-end collision and steel disorder are caused.
The applicant found that: in the 4-cutting process, the 4 bar steel supports are formed and moved under the same conditions, however, two bar steel supports normally travel, and the other two bar steel supports do not travel linearly but travel diagonally or collide with the skirt board or the side board of the post-cutting passage. For these problems, the applicant has long studied to find out a plurality of influencing factors, which are considered to be problems between the rear-end collision and the steel disorder after 3# flying shears and the post-shearing passage, and other links have no problems, so that the applicant should mainly pay attention to the upper surfaces of the first section of guide groove after 3# flying shears and the second section of guide groove after 3# flying shears.
Therefore, the applicant carefully checks whether the bottom wall of the first section of guide groove after the 3# flying shears is uniformly manufactured, whether the friction coefficients are the same, whether the bottom wall of the second section of guide groove after the 3# flying shears is uniformly manufactured, whether the friction coefficients are the same, whether the 3# flying shears have axial eccentricity, whether the two side walls of the first section of guide groove after the 3# flying shears are different in thickness, heat dissipation is affected, whether the two side walls of the second section of guide groove after the 3# flying shears are different in thickness, and whether the widths of the first section of guide groove after the 3# flying shears and the second section of guide groove after the 3# flying shears are insufficient. After the applicant has improved all these factors, the problem is still not solved. The applicant decides to take the stove off after many failed and fuzzed investigation, and expands the factor of investigation to other links from heating to 3# flying shears.
To solve this problem, the applicant studied the links between the flying shears from heating to 3# carefully, did not find any anomalies, and did not see or find any problems in the field. However, since this problem has not been solved for a long time, the applicant believes that it is certainly a phenomenon on the surface that masks the problem. The applicant has carried out analyses from a theoretical point of view and from an actual view, respectively. The applicant improves the observation method, changes manual observation and common video recording into high-speed video photographing, performs detailed analysis on each link just like medical B ultrasonic, and finally discovers that: when the bar steel branches enter the second guide groove before the 3# flying shears, the speed of two of the 4 bar steel branches is slightly lower than that of the other two bar steel branches, the speed difference is 1-2% (about 0.13 m/s), and the bar steel branches are hardly felt by naked eyes, and no people pay attention to the bar steel branches, and no people can think the bar steel branches.
The applicant has continued to analyze the cause thereof. After analysis of the finishing mill, the applicant found that: in the last finishing mill, although the rolling reduction of the rolls on each groove is theoretically the same, in actual rolling, since the distances between the distribution of 4 bar steel stands and the motor end or the bearing block end are different, the rolling reduction of each groove for rolling 4 bar steel stands is also slightly different, and the rolling reduction of the grooves at two intermediate positions is different from the rolling reduction of the grooves at the other two edges, resulting in a slight difference in rolling radius. Thus, in high speed rolling, the rolling mill can present 4 bar steel branches, two of which have a slightly lower linear velocity than the other two, especially at the end of the life of one roll, the applicant has found that: this difference in speed is greater than the earlier part of a roll life cycle due to wear of the rolls. After finish rolling, the bar steel branch enters the flying shears (some processes are that the bar steel branch enters the flying shears through a water passing device), and enters a post-shearing channel after being sheared by the flying shears, because the shearing speed of the flying shears is generally larger than the speed of the bar steel branch by a certain proportion, the speed difference between the bar steel branches after finish rolling is enlarged, when the bar steel branch enters the post-shearing channel, the bar steel branch in the same post-shearing channel can keep the normal speed required by straight walking, and the bar steel branch is smaller than the normal speed required by straight walking, and is influenced by friction of the channel and the taper of the inlet of the channel, and the bar steel branch with low speed can walk in oblique lines or collide on the skirtboard or the side board of the post-shearing channel
Through the above analysis, the applicant found that the cause of this problem was comprehensive: although the problem occurs after shearing, the reason is that the stage before shearing is not the stage after shearing, the reason is that the rolling radius of each groove of the finishing mill is different in split rolling, the linear speed is different, and the expansion factor is that the shearing of the flying shears further expands the speed difference of the bar steel branch in the same post-shearing channel, so that the bar steel branch with low speed is difficult to keep the speed value required for straight running, and the bar steel branch is inclined to walk or collide on the skirt board or the side board of the post-shearing channel.
Accordingly, the applicant has started to improve the problem of the variation in rolling radius of each groove of the finishing mill. However, the applicant has found that, whatever the improvement, there is always a difference in the rolling radii of the various grooves of the finishing mill, and that the reduction of this difference is not significant. The applicant has also wanted to improve the through-water cooling process. However, the water cooling process system has complete requirements, and the process parameters are difficult to greatly improve. Technological challenges have encountered bottlenecks.
Although the reasons for the problems are found, the applicant does not have the expected effect on the technology of improving the rolling mill and the through water cooling, but the applicant changes the thinking, is not entangled on the root of the speed difference, and forms a new way, and under the condition of the speed difference, the speed of the bar steel branch with low speed is increased to reduce or eliminate the speed difference, so that the bar steel branch with low speed can also obtain the speed value required by straight running. For this purpose, the applicant has identified a quick and convenient way of reducing or eliminating the speed difference of the bar steel after finishing before entering the flying shears. Therefore, after finish rolling, the applicant enters the guide groove part in front of the flying shears, namely, the region range of the first section guide groove in front of the 3# flying shears and the second section guide groove in front of the 3# flying shears, and simultaneously, 4 bar steel branches are given enough speed, the speed can be increased to the speed of 2 bar steel branches with low original speed, basically the 4 bar steel branches can regain the same speed, thus, after shearing, the 4 bar steel branches also have no obvious speed difference, and finally, the actual production proves that the technology skillfully solves the technical problems of irregular walking swing of the steel branches in a post-shearing channel and rear-end collision and mess steel.
2. Implementation of the solution
As shown in fig. 1, 2, 3 and 4, the multi-line bar cutting line of the present invention comprises:
the finishing mill group 8, the water cooling device 7, the front guide groove of the 3# flying shear, the 4 of the 3# flying shear, the rear guide groove of the 3# flying shear and the cooling bed 9 are sequentially connected; the bar steel branch is subjected to multi-line splitting on the finishing mill group 8; the water passing cooling device 7 is of a pipeline structure with openings at two ends and is used for performing water cooling on a plurality of bar steel supports subjected to splitting rolling so as to improve the performance of bars; the cooling bed 9 receives bar steel rods sheared by the 3# flying shears, and a plurality of rolled and sheared bar steel rods are moved to racks of the cooling bed one by the cooling bed. And (3) carrying out air cooling on the bar steel on the cooling bed 9, and then bundling and packaging.
The 3# flying shear front guide groove comprises: the first section of guide groove 1 in front of the 3# flying shear and the second section of guide groove 2 in front of the 3# flying shear are connected in sequence; the length of the second section of guide groove 2 before the 3# flying shear is longer than that of the first section of guide groove 1 before the 3# flying shear; the first section of guide groove 1 of the 3# flying shear is in a horn mouth shape; the first section of guide groove 1 in front of the 3# flying shear is adjacent to the 3# flying shear 4, and the first section of guide groove 1 in front of the 3# flying shear plays a role in gathering bar steel, so that the bar steel is gathered at the 3# flying shear 4 for shearing; the upstream of the second section of guide groove 2 in front of the 3# flying shear can be sequentially connected with a guide groove, a water passing cooling device and a finishing mill group, and bar steel in the second section of guide groove 2 in front of the 3# flying shear is subjected to finishing rolling and/or water passing cooling treatment;
as shown in fig. 2 and 3, the second-stage guide groove 2 of the 3# flying shear includes: a rectangular main guide groove 21 and a tapered auxiliary guide groove 22 connecting the rectangular main guide groove; the sections of the rectangular main guide grooves 21 are the same along the length direction, so that the main transportation and guiding functions are realized on the bar steel support, the conical auxiliary guide grooves 22 are in a horn mouth shape, the gathering function is realized, the bar steel support is gathered into the rectangular main guide grooves 21, and the outlet of the rectangular main guide grooves 21 extends into the inlet of the first section guide groove 1 in front of the 3# flying shears;
the steel branch of the bar is in a running direction 3 from a second section of guide groove in front of the 3# flying shear to a first section of guide groove in front of the 3# flying shear, and the first section of guide groove 1 in front of the 3# flying shear is positioned between the 3# flying shear 4 and the second section of guide groove 2 in front of the 3# flying shear;
as shown in fig. 1, a variable frequency support roller way 25 is arranged in the second section of guide groove 2 in front of the 3# flying shear; as shown in fig. 2 and 3, the second section of guide slot before the 3# flying shear is provided with two side walls and a bottom wall arranged between the two side walls, an opening is formed between the two side walls of the second section of guide slot before the 3# flying shear, the supporting roller is arranged in the opening, and the axis of the supporting roller is parallel to the bottom wall of the second section of guide slot before the 3# flying shear. The variable frequency support roller way 25 includes: the device comprises a variable frequency motor 251 and a supporting roller 252 connected with the variable frequency motor, wherein the variable frequency motor 251 is arranged on the side wall of a second section of guide groove before 3# flying shears, an opening is formed in the bottom wall of a second section of guide groove 2 before 3# flying shears, and the supporting roller 252 is arranged in the opening; or the supporting roller 252 is arranged in the second section guide groove 2 in front of the 3# flying shears; the axis of the supporting roller 252 is parallel to the bottom wall of the second section of guide groove in front of the 3# flying shear, as shown in fig. 2, the horizontal line 253 of the surface of the variable frequency roller is the highest position of the supporting roller, and is a supporting surface for supporting the steel bar, and is higher than the bottom wall of the second section of guide groove in front of the 3# flying shear, so as to support the steel bar.
Further, the supporting roller is arranged on the side wall of the rectangular main guide groove, so that transmission and installation are facilitated.
Further, the number of the supporting rollers is two, namely a supporting roller at the head end and a supporting roller at the tail end, and the supporting roller at the head end is positioned between the 3# flying shears and the supporting roller at the tail end so as to share and provide enough power and enough support and speed supplement.
Furthermore, the distance between the two supporting rollers is 1 meter, so that the steel support can ensure the horizontal shearing effect and can not collide with the flying shear arm.
Further, the distance between the support roller at the head end and the shearing center of the 3# flying shear is 1550mm to 1750mm, so that the horizontal shearing effect can be ensured, and the flying shear arm cannot be impacted.
Further, the support roller at the head end is 450mm to 550mm from the front edge of the rectangular main guide groove (leftmost vertical side of the main guide groove 21 in fig. 2). Therefore, the steel support walks in the guide groove with small fluctuation, and the distance between the steel support and the last variable frequency roller is about one meter, so that the roller distance is unified to have a stabilizing effect on the bouncing of the rolled piece.
Further, the first section of guide groove 5 behind the 3# flying shears and the second section of guide groove 6 behind the 3# flying shears are sequentially connected, the first section of guide groove 5 behind the 3# flying shears is in a horn mouth shape, and the second section of guide groove 6 behind the 3# flying shears and the second section of guide groove 2 in front of the 3# flying shears have the same structure. The length of the second section of guide groove behind the 3# flying shears is longer than that of the second section of guide groove 2 in front of the 3# flying shears by several times or even tens times, and the effect of conveying the sheared bar steel support to a cooling bed is achieved. The second section guide slot behind the 3# flying shears is also provided with a variable frequency support roller way so as to ensure that each bar steel branch has a certain speed to go straight after shearing.
Furthermore, the finishing mill group is provided with a rolling groove for dividing the steel bars into four lines, and the bar multi-line dividing production line is used for dividing the bars into four lines, is 4 times of the efficiency of common single-line rolling, and is used for conveying four steel bars through a second section of guide groove before the 3# flying shears. The steel bar can be of two specifications of 12mm and 14mm in diameter. The shear section of the rolled piece and the preferred running speed are shown in Table 1:
| sequence number | Rolled piece specification (mm) | Area of rolled piece (mm 2) | Speed of rolling stock (m/s) | Remarks |
| 1 | 12 | 226.2 | 13.2 | Slit rolling |
| 2 | 14 | 307.8 | 13.5 | Slit rolling |
Table 1: rolled piece shearing section and running speed meter
Further, the size of the supporting roller is phi 180mm multiplied by 380mm; the model of the variable frequency motor: YVP100L2-4, p=2.2 KW to have sufficient power to provide support and transport for four steel bar branches; the transmission mode is as follows: alternating current frequency conversion, independent transmission and continuous forward running. The linear speed of the variable-frequency support roller way is 13.5m/s, so that four steel bars can acquire the same speed again.
Further, the model of the motor adopted by the 3# flying shears is Z355-6C, the rated power is 355KW, and the linear speed of the shearing edge of the 3# flying shears exceeds the running speed of the steel bar branch by 2-10%, for example, the linear speed is controlled within 2-5% of the running speed of the steel bar branch, so that the expansion of the speed difference is reduced as much as possible on the premise of realizing shearing; minimum shear temperature: 550 ℃, thermal tensile strength of rolled piece: less than or equal to 300MPa, maximum shearing force of 400KN, radius of gyration: 505mm, the speed of the bar steel branch entering the conical auxiliary guide groove of the second section guide groove before the 3# flying shear is 3-18 m/s, and the length of the bar steel branch after shearing is 84-108 m. The parameters of the 3# flying shears are matched with other parameters of slitting and rolling, so that normal shearing and normal running of bar steel after shearing are ensured.
According to the invention, the situation that the multi-line split steel is askew after being split by the 3# flying shears is changed, the walking stability is improved, the possibility that the steel head is impacted and deformed in a channel is reduced, the situation that the steel is blocked due to the fact that the steel flies out of a rear end on a movable apron board is finally avoided, the waste products are reduced, the time for processing faults is reduced, the production efficiency of the whole rolling line is improved, the efficiency can be improved by more than 10% in the earlier stage of the service cycle of one roller, the fault reduction time is more in the later stage of the service cycle of one roller, the efficiency is improved more obviously, and the efficiency can be improved by 20%.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. In order that the components of the invention may be combined without conflict, any person skilled in the art shall make equivalent changes and modifications without departing from the spirit and principles of the invention.
Claims (7)
1. The utility model provides a rod multi-line segmentation production line which characterized in that, rod multi-line segmentation production line includes:
the finishing mill group, the water cooling device, the 3# flying shear front guide groove, the 3# flying shear rear guide groove and the cooling bed are sequentially connected; the bar steel branch is subjected to multi-line splitting on a finishing mill group; the water cooling device is a pipeline structure with openings at two ends;
the 3# flying shear front guide groove comprises: the guide groove of the first section of the 3# flying shear and the guide groove of the second section of the 3# flying shear are sequentially connected; the length of the second section of guide groove before the 3# flying shear is longer than that of the first section of guide groove before the 3# flying shear; the first section of guide groove of the 3# flying shear is in a horn mouth shape; the second section guide slot before the 3# flying shears comprises: a rectangular main guide groove and a conical auxiliary guide groove connected with the rectangular main guide groove; the outlet of the rectangular main guide groove extends into the inlet of the first section guide groove of the 3# flying shear;
the first section of guide groove in front of the 3# flying shear is close to the 3# flying shear, and the second section of guide groove in front of the 3# flying shear is far away from the 3# flying shear;
the second section guide groove in front of the 3# flying shear is provided with two side walls and a bottom wall arranged between the two side walls, and a variable frequency support roller way is arranged in the second section guide groove in front of the 3# flying shear; the frequency conversion support roller way comprises: the device comprises a variable frequency motor and a support roller connected with the variable frequency motor, wherein the variable frequency motor is arranged on the side wall of a second section of guide groove in front of a 3# flying shear, an opening is formed between the two side walls of the second section of guide groove in front of the 3# flying shear, the support roller is arranged in the opening, and the axis of the support roller is parallel to the bottom wall of the second section of guide groove in front of the 3# flying shear;
the number of the supporting rollers is two, namely a supporting roller at the head end and a supporting roller at the tail end, and the supporting roller at the head end is positioned between the 3# flying shears and the supporting roller at the tail end;
the distance between the support roller at the head end and the shearing center of the 3# flying shear is 1550mm to 1750mm;
the distance between the support roller at the head end and the front edge of the rectangular main guide groove is 450mm to 550mm;
after finish rolling, the steel rod enters the guide groove part in front of the flying shear, namely the region range of the first section guide groove in front of the 3# flying shear and the second section guide groove in front of the 3# flying shear, and simultaneously 4 steel rods are given enough speed, and the speed can be increased by 2 steel rods with low original speed, so that the 4 steel rods can acquire the same speed again; after shearing, 4 steel bars have no obvious speed difference.
2. The bar multi-line splitting line according to claim 1, characterized in that said variable frequency motor is arranged on the side wall of said rectangular main guide slot.
3. The multi-wire rod cutting line according to claim 1, wherein the distance between the two supporting rollers is 1 meter.
4. The bar multi-line cutting production line according to claim 1, wherein a first section of guide groove behind the 3# flying shears and a second section of guide groove behind the 3# flying shears are sequentially connected, the first section of guide groove behind the 3# flying shears is in a horn mouth shape, the second section of guide groove behind the 3# flying shears is provided with the variable frequency support roller way, and the length of the second section of guide groove behind the 3# flying shears is more than ten times of that of the second section of guide groove in front of the 3# flying shears.
5. The multi-line bar splitting line according to claim 1, wherein the finishing mill group is provided with a rolling groove for splitting bar steel branches in four lines, and the second guide groove before 3# flying shears is used for conveying four bar steel branches.
6. The bar multi-line cutting line according to claim 1, wherein the dimensions of the support rollers are phi 180mm x 380mm; the model of the variable frequency motor: YVP100L2-4, rated power p=2.2 KW; the transmission mode is as follows: alternating current frequency conversion, independent transmission and continuous forward running.
7. The multi-line bar cutting production line according to claim 1, wherein a motor model adopted by the 3# flying shears is Z355-6C, rated power is 355KW, and the linear speed of a cutting edge of the 3# flying shears exceeds the running speed of a bar steel branch by 2-10%, and the turning radius is as follows: 505mm, the speed of the bar steel branch entering the conical auxiliary guide groove of the second section guide groove before the 3# flying shear is 3-18 m/s, and the length of the bar steel branch after shearing is 84-108 m.
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| CN201811344652.1A CN109396182B (en) | 2018-11-13 | 2018-11-13 | Multi-line bar cutting production line |
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| CN109396182B true CN109396182B (en) | 2023-07-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001047129A (en) * | 1999-07-30 | 2001-02-20 | Sumitomo Metal Ind Ltd | Processing method in case of being impossible to coil hot rolled steel strip |
| CN101007315B (en) * | 2007-01-18 | 2010-10-06 | 湖南华菱涟源钢铁有限公司 | Non-groove rolling technology of horizontal mill |
| CN101491812B (en) * | 2009-03-06 | 2011-09-07 | 武汉钢铁(集团)公司 | Hot continuous rolling medium-and-heavy plate production method and device without coiling micro-stress |
| CN103551403B (en) * | 2013-10-29 | 2015-06-17 | 中冶建筑研究总院有限公司 | Controlled rolling and controlled cooling system for bars |
| CN207170759U (en) * | 2017-09-27 | 2018-04-03 | 黑龙江建龙钢铁有限公司 | The leading roller arrangement of the cold flying shear of one kind bar |
| CN209255477U (en) * | 2018-11-13 | 2019-08-16 | 柳州钢铁股份有限公司 | Rolling bar production line |
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