阅读说明：本技术 酸洗机组防止跑尾机构 (Mechanism for preventing tail from running out for pickling line ) 是由 王金鹏 张世阳 邸岩 于 2021-09-13 设计创作，主要内容包括：本发明提供一种酸洗机组防止跑尾机构,包括：焊接部、第一输送部、酸洗工艺段、第二输送部和轧机,第一输送部上与焊接部连接的一侧设有检测夹紧装置,第一运输部用于将上一卷带钢输送至酸洗工艺段进行酸洗,第二输送部用于将酸洗后的上一卷带钢输送至轧机中进行冷轧,焊接部用于将下一卷带钢的卷头与上一卷带钢的卷尾焊接连接,检测夹紧装置用于检测上一卷带钢是否发生尾部脱离,并在尾部发生脱离时夹紧带钢尾部。本发明可防止带钢尾部脱离1#传动辊进入入口活套。(The invention provides a mechanism for preventing tail from running of a pickling line, which comprises: the device comprises a welding part, a first conveying part, an acid pickling process section, a second conveying part and a rolling mill, wherein a detection clamping device is arranged on one side of the first conveying part connected with the welding part, the first conveying part is used for conveying a previous strip steel to the acid pickling process section for acid pickling, the second conveying part is used for conveying the acid-pickled previous strip steel to the rolling mill for cold rolling, the welding part is used for welding the head of the next strip steel with the tail of the previous strip steel, and the detection clamping device is used for detecting whether the tail of the previous strip steel is separated or not and clamping the tail of the strip steel when the tail is separated. The invention can prevent the tail of the strip steel from separating from the No. 1 driving roller and entering the inlet loop.)

1. The utility model provides a mechanism for preventing tail running of pickling line, its characterized in that includes: weld part, first conveying part, pickling process section, second conveying part and rolling mill (18), be equipped with detection clamping device with weld part connection's one side in the first conveying part, first transportation portion is used for carrying last one book belted steel to pickling process section and carries out the pickling, second conveying part is arranged in carrying the last one book belted steel after the pickling to cold rolling in rolling mill (18), the weld part is used for rolling up head (01) of next one book belted steel and book tail (02) welded connection of last one book belted steel, detection clamping device is used for detecting whether the afterbody takes place to break away from of last one book belted steel to press from both sides the belted steel afterbody when the afterbody takes place to break away from.

2. The mechanism for preventing the tail of the pickling line from running out of the steel belt of claim 1, wherein the first conveying part comprises an inlet section, a # 1 transmission roller (7), an inlet loop (8) and a # 2 transmission roller (11) which are sequentially connected with one another from left to right, one side of the inlet section is close to the welding part and used for fixing the tail part of a previous coil of steel belt, a loop trolley (9) and a loop hoisting mechanism (10) are arranged in the inlet loop (8), the loop hoisting mechanism (10) stores the steel belt for the inlet loop (8), the loop hoisting mechanism (10) releases the rope in the time of the steel belt before and after the steel belt is rapidly welded at the welding part, the inlet loop (8) releases the steel belt storage amount in the inlet loop for the pickling process section through the # 2 transmission roller (11), and the loop trolley (9) runs towards the emptying direction; after the welding of the welding part is finished, strip steel is filled into the inlet loop (8) at a high speed which is more than 2 times of that of the pickling process section at the inlet section, the loop vehicle (9) runs in the filling direction, and the loop hoisting mechanism (10) is utilized to store the strip steel allowance for the next welding;

the pickling process section comprises a pickling part and a rinsing part dryer (14), wherein the pickling part consists of a plurality of pickling tanks (12) and is used for pickling the strip steel in sequence; the rinsing part consists of a plurality of rinsing tanks (13) and sequentially rinses the pickled strip steel; the dryer (14) dries the rinsed strip steel;

the second conveying part comprises a 3# driving roller (15), an outlet loop (16) and a loop trolley (17) which are connected with each other, and the 3# driving roller (15) conveys the dried strip steel to a rolling mill (18) for cold rolling through the loop trolley (17) and the outlet loop (16);

the welding part is a special laser welding machine (2), and one side of the welding part, which is far away from the inlet section, is provided with an uncoiler (1) for providing the next coil of strip steel.

3. The mechanism for preventing tail running of the pickling line according to claim 2, wherein the detection clamping device consists of a computer (3), and a photoelectric sensor (4) and a clamping device (5) which are electrically connected with the computer (3), wherein the photoelectric sensor (4) is arranged on the position, close to the welding part, on the inlet section and is marked as point A for detecting whether tail separation occurs on the previous strip steel; the clamping device (5) is arranged on the inlet section and close to the 1# driving roller (7) and used for clamping the tail of the strip steel when the tail of the previous strip steel is separated, so that the tail of the previous strip steel is prevented from separating from the 1# driving roller (7) and entering an inlet loop (8) interval; the loop winding mechanism (10) is electrically connected with the computer (3).

4. The mechanism of claim 3, wherein the distance between the photoelectric sensor (4) and the 1# driving roller (7) is 5 m.

5. The mechanism for preventing tail running of the pickling line according to claim 3, wherein the clamping device (5) is a pneumatic clamping device (5) and consists of an upper clamping plate, a lower clamping plate, a cylinder and an electromagnetic valve (6), the upper clamping plate and the lower clamping plate are respectively connected with the cylinder and are respectively arranged above and below the strip steel, the cylinder is connected with the electromagnetic valve (6), and the electromagnetic valve (6) is electrically connected with the computer (3);

the computer (3) controls the inlet loop (8) to reduce tension during welding according to strip steel data, when the photoelectric sensor (4) detects that the tail of the strip steel is separated from the point A, the computer (3) gives instructions of power failure of the loop winding mechanism (10) and clamping of the two clamping plates, the loop winding mechanism (10) stops tensioning the strip steel, the electromagnetic valves (6) corresponding to the two clamping plates are powered on, the cylinder extends out, the clamping device (5) clamps the tail of the strip steel, the upper clamping plate is in compression connection with the upper surface of the strip steel, and the lower clamping plate is in compression connection with the lower surface of the strip steel; the further the two clamping plates are from point a, the more time is gained for the clamping action of the clamping plates.

6. The mechanism of claim 5, wherein the inner surfaces of the upper clamping plate and the lower clamping plate, which are in contact with the strip steel, are lined with rubber layers to increase the friction force between the upper clamping plate and the strip steel; when the clamping device (5) is in an initial state, namely the strip steel is not clamped, the distance between the surfaces of the upper rubber layer and the lower rubber layer and the strip steel is 5 mm.

7. The mechanism of claim 5, wherein the clamping process after the strip steel tail is separated is as follows: after the tail part of the strip steel leaves the uncoiler (1), welding operation is carried out, meanwhile, the driving roller 1 (7) is inching, then the inching of the driving roller 1 (7) is stopped, when the band-type brake is not tight, the tail part of the strip steel leaves the point A, the photoelectric sensor (4) detects that the tail part of the strip steel is separated, at the moment, the computer (3) controls the motor of the loop winding mechanism (10) to be powered off, and the loop winding mechanism (10) is tensioned and cut off; then, controlling the two clamping plates to act, and clamping the tail of the strip steel to stop the tail of the strip steel at a position 1.5m away from the 1# driving roller (7);

and (3) processing after clamping: the two clamping plates continue to clamp the tail part of the strip steel, then a motor brake of the 1# transmission roller (7) is checked and processed, the two clamping plates are loosened by an operating button, the power supply of the loop winding mechanism (10) is recovered, the tension of the inlet loop (8) is recovered, the 1# transmission roller (7) is inching, the tail part of the strip steel is enabled to move to a welding position, the strip steel can be welded before and after, and the normal production running state is recovered.

8. The mechanism for preventing the strip from running out of the pickling line according to any one of claims 2 to 7, wherein the strip tension during the operation of the strip at the inlet section is established by the difference between the rotating speeds of the 1# driving roller (7) and the loop winding mechanism (10), and the front and the rear coils of the strip are connected during the period, so that the problem of strip tail separation is avoided; controlling the tension of the strip steel according to normal parameters;

during welding, the tension of the inlet loop (8) is established by a loop winding mechanism (10) and a motor brake of the 1# transmission roller (7), the running speed of a loop vehicle (9) is relatively low, the strip steel tension of the inlet loop (8) is reduced during the period, and the control is performed according to 76% of normal parameters, so that the speed and the probability that the tail of the strip steel is separated from the 1# transmission roller (7) are reduced.

9. The tail-running prevention mechanism of pickling line as claimed in claim 8, wherein the unit tension of inlet loop (8) during the operation of inlet section strip steel is 0.59KG/mm²(ii) a The unit tension of the inlet loop (8) during the strip steel welding of the inlet section is 0.45KG/mm²(ii) a The thickness of the strip steel in the inlet loop (8) is 3.0mm, and the width is 1525 mm.

10. The acid of claim 9The mechanism for preventing the tail from running out of the washing unit is characterized in that the strip steel tension of the inlet loop (8) is 0.59KG/mm when the strip steel at the inlet section runs²X 1525mm x 3.0mm ═ 2.7 tons;

when the strip steel at the inlet section is welded, the strip steel tension of the inlet loop (8) is 0.45KG/mm²X 1525mm x 3.0mm ═ 2.06 ton;

that is, the tension of the inlet loop (8) is transformed into:

when the strip steel at the inlet section runs, the strip steel tension of the inlet loop (8) is 2.7 tons;

when the tail part of the strip steel leaves the uncoiler (1), the tension of the inlet loop (8) is reduced to 2.06 tons;

and after the front and the back strip steel are welded, starting the inlet section to operate, and restoring the tension of the inlet loop (8) to 2.7 tons.

Technical Field

The invention relates to the technical field of cold-rolled strip steel pickling, in particular to a tail-running prevention mechanism of a pickling line.

Background

In order to ensure continuous operation of process section strip steel, a strip steel pickling unit rapidly welds front and rear strip steel by using a special laser welding machine, but during welding, when the tail of the operation strip steel is inching, the tail of the previous strip steel is separated from a No. 1 driving roller and enters an inlet loop interval. The accident is called tail running, and the operator needs to pull the tail of the strip steel back to the welding machine for welding again and wind the steel rope again, so that the processing time is more than 4 hours. Therefore, it is necessary to design a tail-running prevention mechanism of the pickling line to prevent the tail part of the strip steel from separating from the No. 1 driving roller and entering the inlet loop.

Disclosure of Invention

According to the technical problem that the tail of the previous strip steel is separated from the No. 1 transmission roller and enters the inlet loop interval when the tail of the strip steel is jogged during the strip steel welding process before and after the strip steel is welded, an operator needs to pull the tail of the strip steel back to a welding machine for re-welding and re-coil a steel rope, and the processing time needs more than 4 hours, the tail running prevention mechanism of the pickling line is provided. The invention mainly reduces the tension of the inlet loop during welding, thereby reducing the speed and probability of the strip steel tail separation and providing a guarantee on time for the clamping plate to clamp the strip steel tail; by arranging a photoelectric sensor behind the welding machine for detection and adopting a method of dual protection of loop tension cutting and clamping of a clamping plate, reliable guarantee is provided for preventing the tail of the strip steel from separating, and therefore the tail of the strip steel is prevented from separating from a No. 1 driving roller and entering an inlet loop.

The technical means adopted by the invention are as follows:

a mechanism for preventing tail from running out of pickling line comprises: weld part, first conveying part, pickling process section, second conveying part and rolling mill, be equipped with detection clamping device with weld part connection's one side in the first conveying part, first transportation portion is used for carrying last strip steel to the pickling process section and carries out the pickling, the second conveying part is arranged in carrying out cold rolling in the rolling mill with last strip steel after the pickling, the weld part is used for the book head with next strip steel and the book tail welded connection of last strip steel, detection clamping device is used for detecting whether the afterbody breaks away from of last strip steel to press from both sides tight afterbody when the afterbody takes place to break away from.

Furthermore, the first conveying part consists of an inlet section, a # 1 transmission roller, an inlet loop and a # 2 transmission roller which are sequentially connected with each other from left to right, one side of the inlet section is close to the welding part and is used for fixing the tail part of a previous coil of strip steel, a loop vehicle and a loop hoisting mechanism are arranged in the inlet loop, the loop hoisting mechanism stores the strip steel for the inlet loop, when the welding part quickly welds the strip steel before and after the strip steel, the loop hoisting mechanism releases a rope, the inlet loop releases the strip steel storage amount in the inlet loop for the pickling process section through the # 2 transmission roller, and the loop vehicle runs towards the emptying direction; after the welding of the welding part is finished, the inlet section fills strip steel into the inlet loop at a high speed which is more than 2 times of that of the pickling process section, the loop vehicle runs towards the filling direction, and the loop hoisting mechanism is utilized to store the strip steel allowance for the next welding;

the pickling process section comprises a pickling part, a rinsing part, a dryer and the like, wherein the pickling part consists of a plurality of pickling tanks and is used for pickling the strip steel in sequence; the rinsing part consists of a plurality of rinsing tanks and sequentially rinses the pickled strip steel; the dryer dries the rinsed strip steel;

the second conveying part comprises a 3# driving roller, an outlet loop and a loop trolley which are connected with each other, and the 3# driving roller conveys the dried strip steel to a rolling mill for cold rolling through the loop trolley and the outlet loop;

the welding part is a special laser welding machine, and an uncoiler is arranged on one side of the welding part, which is far away from the inlet section, and is used for providing the next coil of strip steel.

Furthermore, the detection clamping device consists of a computer, and a photoelectric sensor and a clamping device which are electrically connected with the computer, wherein the photoelectric sensor is arranged at a position close to the welding part on the inlet section and is marked as a point A for detecting whether the tail of the previous strip steel is separated; the clamping device is arranged on the inlet section and close to the 1# transmission roller and used for clamping the tail of the strip steel when the tail of the previous strip steel is separated, so that the tail of the previous strip steel is prevented from separating from the 1# transmission roller and entering an inlet loop section; the loop winding mechanism is electrically connected with the computer.

Further, the distance between the photoelectric sensor and the 1# driving roller is 5 m.

Furthermore, the clamping device is a pneumatic clamping device and consists of an upper clamping plate, a lower clamping plate, a cylinder and an electromagnetic valve, wherein the upper clamping plate and the lower clamping plate are respectively connected with the cylinder and are respectively arranged above and below the strip steel, the cylinder is connected with the electromagnetic valve, and the electromagnetic valve is electrically connected with a computer;

the computer controls the inlet loop to reduce tension during welding according to strip steel data, when the photoelectric sensor detects that the tail part of the strip steel is separated from the point A, the computer gives a power-off instruction of the loop winding mechanism and a clamping instruction of the two clamping plates, the loop winding mechanism stops tensioning the strip steel, the electromagnetic valves corresponding to the two clamping plates are electrified, the air cylinder extends out, the clamping device clamps the tail part of the strip steel, the upper clamping plate is in compression connection with the upper surface of the strip steel, and the lower clamping plate is in compression connection with the lower surface of the strip steel; the further the two clamping plates are from point a, the more time is gained for the clamping action of the clamping plates.

Furthermore, the inner surfaces of the upper clamping plate and the lower clamping plate, which are contacted with the strip steel, are lined with rubber layers, so that the friction force between the upper clamping plate and the strip steel is increased; when the clamping device is in an initial state, namely when the strip steel is not clamped, the distance between the surfaces of the upper rubber layer and the lower rubber layer and the strip steel is 5 mm.

Further, the clamping process after the tail of the strip steel is separated comprises the following steps: after the tail part of the strip steel leaves the uncoiler, welding operation is carried out, the driving roller No. 1 is inching, then the inching of the driving roller No. 1 is stopped, when the band-type brake is not tight, the tail part of the strip steel leaves the point A, the photoelectric sensor detects that the tail part of the strip steel is separated, at the moment, the motor of the loop winding mechanism is controlled by the computer to be powered off, and the loop winding mechanism is tensioned and cut off; then, controlling the two clamping plates to act, and clamping the tail of the strip steel to stop the tail of the strip steel at a position 1.5m away from the 1# driving roller;

and (3) processing after clamping: the two clamping plates continue to clamp the tail of the strip steel, then a motor band-type brake of the 1# transmission roller is checked and processed, the two clamping plates are loosened by an operating button, the power supply of the loop winding mechanism is recovered, the tension of the inlet loop is recovered, the 1# transmission roller is inching, the tail of the strip steel is made to advance to a welding position, the strip steel can be welded in front and at the back, and the normal production running state is recovered.

Furthermore, the strip steel tension during the operation of the strip steel at the inlet section is established by the rotating speed difference between the 1# driving roller and the loop winding mechanism, and the front and the rear roll of strip steel are connected during the period, so that the problem of strip steel tail separation is avoided; controlling the tension of the strip steel according to normal parameters;

during welding, the tension of the inlet loop is established by a loop winding mechanism and a motor brake of the 1# driving roller, the running speed of a loop vehicle is relatively low, the tension of the strip steel of the inlet loop is reduced during the period, and the control is carried out according to 76% of normal parameters, so that the speed and the probability that the tail of the strip steel is separated from the 1# driving roller are reduced.

Further, the unit tension of the inlet loop when the strip steel at the inlet section runs is 0.59KG/mm²(ii) a The unit tension of the inlet loop is 0.45KG/mm during the strip steel welding of the inlet section²(ii) a The thickness of the strip steel in the inlet loop is 3.0mm, and the width is 1525 mm.

Furthermore, the strip steel tension of the inlet loop is 0.59KG/mm when the strip steel of the inlet section runs²X 1525mm x 3.0mm ═ 2.7 tons;

when the strip steel at the inlet section is welded, the strip steel tension of the inlet loop is 0.45KG/mm²X 1525mm x 3.0mm ═ 2.06 ton;

i.e. the tension of the inlet loop is transformed into:

when the strip steel at the inlet section runs, the tension of the strip steel at the inlet loop is 2.7 tons;

when the tail of the strip steel leaves the uncoiler, the tension of an inlet loop is reduced to 2.06 tons;

and after the front and the back strip steel are welded, starting the inlet section to operate, and restoring the tension of the inlet loop to 2.7 tons.

Compared with the prior art, the invention has the following advantages:

1. the mechanism for preventing the tail of the pickling line from running reduces the tension of the inlet loop during welding, thereby reducing the speed and the probability of separating the tail of the strip steel and providing a guarantee on time for clamping the tail of the strip steel by the clamping plate.

2. According to the mechanism for preventing the tail of the pickling line from running out, the photoelectric sensor is arranged behind the welding machine for detection, and a method for cutting off the tension of the loop and clamping the clamping plate for double protection is adopted, so that reliable guarantee is provided for preventing the tail of the strip steel from separating.

In conclusion, the technical scheme of the invention can solve the problem that in the welding period in the prior art, when the tail of the operation strip steel is jogged, the tail of the previous strip steel is separated from the No. 1 driving roller and enters the inlet loop region, an operator needs to pull the tail of the strip steel back to a welding machine for re-welding and re-coil the hoisting steel rope, and the processing time needs more than 4 hours.

Based on the reason, the invention can be widely popularized in the fields of preventing the tail of the strip steel from separating in the pickling line and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of an upper clamping plate of the present invention, in which (a) is a side view and (b) is a front view.

Fig. 3 is a schematic structural view of a lower clamping plate of the present invention, in which (a) is a side view and (b) is a front view.

In the figure: 01. the head of the next strip steel roll; 02. the tail of the previous strip steel is rolled; 1. an uncoiler; 2. a laser welder; 3. a computer; 4. a photosensor; 5. a clamping device; 6. an electromagnetic valve; 7. 1# driving roller; 8. an inlet loop; 9. looping vehicles; 10. a loop winding mechanism; 11. a # 2 driving roller; 12. A pickling tank; 13. a rinsing tank; 14. a dryer; 15. a # 3 driving roller; 16. an outlet loop; 17. A looping trolley; 18. and (4) rolling mills.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1 to 3, the invention provides a tail-running prevention mechanism for a pickling line, which is characterized by comprising: weld part, first conveying part, pickling process section, second conveying part and rolling mill 18, be equipped with detection clamping device with weld part connection's one side in the first conveying part, first transportation portion is used for carrying last strip steel to the pickling process section and carries out the pickling, second conveying part is arranged in carrying out cold rolling in the rolling mill 18 with last strip steel after the pickling, the weld part is used for the book end 01 of next strip steel and the book tail 02 welded connection of last strip steel, detection clamping device is used for detecting whether the afterbody breaks away from of last strip steel to press from both sides tight strip steel afterbody when the afterbody takes place to break away from.

As a preferred embodiment, the first conveying part comprises an inlet section, a # 1 driving roller 7, an inlet loop 8 and a # 2 driving roller 11 which are sequentially connected with one another from left to right, one side of the inlet section is close to the welding part and is used for fixing the tail part of a previous coil of strip steel, a loop trolley 9 and a loop hoisting mechanism 10 are arranged in the inlet loop 8, the loop hoisting mechanism 10 stores the strip steel for the inlet loop 8, when the welding part welds the strip steel before and after quickly, the loop hoisting mechanism 10 releases a rope, the inlet loop 8 releases the strip steel storage amount in the inlet loop for the pickling process section through the # 2 driving roller 11, and the loop trolley 9 runs towards the emptying direction; after the welding of the welding part is finished, the inlet section fills strip steel into the inlet loop 8 at a high speed which is more than 2 times of that of the pickling process section, the loop vehicle 9 runs in the filling direction, and the loop hoisting mechanism 10 is utilized to store the strip steel allowance for the next welding;

the pickling process section comprises a pickling part, a rinsing part, a dryer 14 and the like, wherein the pickling part consists of a plurality of pickling tanks 12 and is used for pickling the strip steel in sequence; the rinsing part consists of a plurality of rinsing tanks 13 and sequentially rinses the pickled strip steel; the dryer 14 dries the rinsed strip steel;

the second conveying part comprises a 3# driving roller 15, an outlet loop 16 and a loop trolley 17 which are connected with each other, and the 3# driving roller 15 conveys the dried strip steel to a rolling mill 18 for cold rolling through the loop trolley 17 and the outlet loop 16;

the welding part is a special laser welding machine 2, and one side of the welding part, which is far away from the inlet section, is provided with an uncoiler 1 for providing the next coil of strip steel.

In a preferred embodiment, the detection clamping device is composed of a computer 3, and a photoelectric sensor 4 and a clamping device 5 which are electrically connected with the computer 3, wherein the photoelectric sensor 4 is arranged on the position, close to the welding part, on the inlet section and is marked as a point A for detecting whether the tail of the previous strip steel is separated; the clamping device 5 is arranged on the inlet section and close to the 1# transmission roller 7 and used for clamping the tail of the strip steel when the tail of the previous strip steel is separated, so that the tail of the previous strip steel is prevented from separating from the 1# transmission roller 7 and entering the inlet loop 8 region; the loop winding mechanism 10 is electrically connected with the computer 3.

In a preferred embodiment, the distance between the photoelectric sensor 4 and the 1# driving roller 7 is 5 m.

As a preferred embodiment, the clamping device 5 is a pneumatic clamping device 5, and is composed of an upper clamping plate, a lower clamping plate, a cylinder and an electromagnetic valve 6, wherein the upper clamping plate and the lower clamping plate are respectively connected with the cylinder and are respectively arranged above and below the strip steel, the cylinder is connected with the electromagnetic valve 6, and the electromagnetic valve 6 is electrically connected with the computer 3;

the computer 3 controls the inlet loop 8 to reduce tension during welding according to strip steel data, when the photoelectric sensor 4 detects that the tail part of the strip steel is separated from the point A, the computer 3 gives instructions of powering off the loop winding mechanism 10 and clamping the two clamping plates, the loop winding mechanism 10 stops tensioning the strip steel, the electromagnetic valves 6 corresponding to the two clamping plates are powered on, the air cylinder extends out, the clamping device 5 clamps the tail part of the strip steel, the upper clamping plate is in compression connection with the upper surface of the strip steel, and the lower clamping plate is in compression connection with the lower surface of the strip steel; the further the two clamping plates are from point a, the more time is gained for the clamping action of the clamping plates. The width W of both clamping plates was 150mm, the length L was 200mm, and the thickness D of each clamping plate excluding the rubber layer was 30 mm.

In a preferable embodiment, the inner surfaces of the upper clamping plate and the lower clamping plate, which are contacted with the strip steel, are lined with rubber layers, so that the friction force between the upper clamping plate and the strip steel is increased; when the clamping device 5 is in an initial state, namely when the strip steel is not clamped, the distance between the surfaces of the upper rubber layer and the lower rubber layer and the strip steel is 5 mm.

In a preferred embodiment, the clamping process after the strip steel tail is separated comprises the following steps: after the tail part of the strip steel leaves the uncoiler 1, welding operation is carried out, meanwhile, the driving roller 7 # 1 is inching, then the inching of the driving roller 7 # 1 is stopped, when the band-type brake is not tight, the tail part of the strip steel leaves the point A, the photoelectric sensor 4 (photoelectric detection switch) detects that the tail part of the strip steel is separated, at the moment, the computer 3 controls the motor of the loop winding mechanism 10 to be powered off, and the loop winding mechanism 10 is tensioned and cut off; then, controlling the two clamping plates to act, and clamping the tail of the strip steel to stop the tail of the strip steel at a position 71.5m away from the 1# driving roller;

and (3) processing after clamping: the two clamping plates continue to clamp the tail part of the strip steel, then a motor internal contracting brake of the 1# transmission roller 7 is checked and processed, the two clamping plates are loosened by an operating button, the power supply of the loop winding mechanism 10 is recovered, the tension of the inlet loop 8 is recovered, the 1# transmission roller 7 is inching, the tail part of the strip steel is made to advance to a welding position, the strip steel can be welded in front and at the back, and the normal production running state is recovered.

As a preferred embodiment, the strip tension during the strip operation at the inlet section is established by the difference between the rotating speeds of the 1# driving roller 7 and the loop winding mechanism 10, and the front and the rear coils of the strip are connected during the period, so that the problem of strip tail separation is avoided; controlling the tension of the strip steel according to normal parameters;

during welding, the tension of the inlet loop 8 is established by a loop winding mechanism 10 and a motor brake of the 1# driving roller 7, the running speed of the loop vehicle 9 is relatively low, the strip steel tension of the inlet loop 8 is reduced during the period, and the control is carried out according to 76% of normal parameters, so that the speed and the probability that the tail of the strip steel is separated from the 1# driving roller 7 are reduced.

In a preferred embodiment, the unit tension of the inlet loop 8 in the running process of the inlet section strip steel is 0.59KG/mm²(ii) a The unit tension of the inlet loop 8 is 0.45KG/mm during the strip steel welding of the inlet section²(ii) a The thickness of the strip steel in the inlet loop 8 is 3.0mm, and the width is 1525 mm.

In a preferred embodiment, the strip tension of the inlet loop 8 during the operation of the inlet strip is 0.59KG/mm²X 1525mm x 3.0mm ═ 2.7 tons;

when the strip steel at the inlet section is welded, the strip steel tension of the inlet loop 8 is 0.45KG/mm²X 1525mm x 3.0mm ═ 2.06 ton;

i.e. the tension of the inlet loop 8 is transformed into:

when the strip steel at the inlet section runs, the strip steel tension of the inlet loop 8 is 2.7 tons;

when the tail of the strip steel leaves the uncoiler 1, the tension of the inlet loop 8 is reduced to 2.06 tons;

and after the front and the back strip steel are welded, starting the inlet section to operate, and recovering the tension of the inlet loop 8 to 2.7 tons.

Example 1

Analysis of the causes of existing problems:

1. due to tail cutting, welding and the like, the brake of the 1# driving roller is frequently operated, and the braking force is gradually reduced.

2. During production, the loop winding motor is in the power-on state no matter whether the strip steel at the inlet section stops or the loop vehicle advances, and the strip steel is tensioned through the steel rope and the loop vehicle. When the braking force of the band-type brake is insufficient, the tail part of the strip steel is pulled into the movable sleeve by breaking away the 1# transmission roller until the winding steel rope is loosened and touches and presses the tension loss protection switch, the winding motor is powered off, and the tail part of the strip steel is stopped.

In order to solve the existing problems, the embodiment provides a tail-running prevention mechanism for a pickling line.

Tension control of first, inlet loop

1. The strip steel tension during the operation of the strip steel at the inlet section is established by the rotating speed difference between the 1# driving roller and the loop winding mechanism, and the strip steel is connected with the strip steel at the front and the back during the period, so that the problem of strip steel tail separation is avoided. The tension of the strip steel is controlled according to normal parameters.

2. During welding, the tension of the inlet loop is established by a loop winding mechanism and a motor brake of the 1# driving roller, the running speed of a loop vehicle is relatively low, the tension of the strip steel of the inlet loop is reduced during the period, and the control is carried out according to 76% of normal parameters, so that the speed and the probability that the tail of the strip steel is separated from the 1# driving roller are reduced.

Second, photoelectric sensor detection

The bit of the photosensor is set at point a. Under normal conditions, the tail of the strip steel moves towards the 1# driving roller and cannot exceed the position of the point A. The function of the photoelectric sensor is to detect whether the strip steel runs out of the tail (figure 1).

Third, the pneumatic clamping plate

A pneumatic clamping plate is provided. The function is to clamp the strip steel after the photoelectric sensor detects that the tail part of the strip steel is separated. The upper and lower of the strip steel are respectively provided with a clamping plate, one side of each clamping plate close to the strip steel is lined with a rubber layer to increase friction force, and the air cylinder drives the clamping plates.

Control relationship

The computer controls the inlet looper to reduce tension during welding in accordance with the strip data. When the photoelectric sensor detects that the strip steel is separated from the point A, the computer gives a power-off instruction and a clamping instruction of the clamping plate of the loop winding mechanism, and the loop winding mechanism stops tensioning the strip steel; the electromagnetic valve of the clamping plate is electrified, and the cylinder stretches out to clamp the tail part of the strip steel. The further the pinch plate is from point a, the more time is gained for the pinch plate action. The surface of the rubber layer of the clamping plate is 5mm away from the strip steel (figures 1-3).

(a) related parameter

1. Entrance loop unit tension of 0.59KG/mm during entrance section strip steel operation²。

2. The unit tension of the inlet loop is 0.45KG/mm during the welding of strip steel at the inlet section²。

3. The photoelectric sensor is 5m away from the 1# driving roller.

4. The thickness of the strip steel in the inlet loop is 3.0 mm; the width is 1525 mm.

(II) tension control

1. The strip steel tension of the inlet loop is 0.59KG/mm when the strip steel at the inlet section operates²X 1525mm x 3.0mm 2.7 ton.

2. When the strip steel at the inlet section is welded, the strip steel tension of the inlet loop is 0.45KG/mm²X 1525mm x 3.0mm 2.06 ton.

3. The tension of the inlet loop is changed.

The strip steel at the inlet section runs; the tension of the inlet loop strip steel is 2.7 tons;

the tail part of the strip steel leaves the uncoiler → the tension of the inlet loop is reduced to 2.06 tons;

the welding of the front and the rear steel strips is finished → the starting operation of the inlet section → the tension of the inlet loop is recovered to 2.7 tons.

(III) clamping after strip steel tail is separated

1. And (5) clamping. The tail part of the strip steel leaves the uncoiler → welding operation → 1# driving roller inching stop → band-type brake not tight → the tail part of the strip steel leaves a point A → a photoelectric detection switch detects that the strip steel is separated → a loop winding mechanism motor is powered off → winding tensioning is cut off; clamping plate action → clamping strip tail → strip tail stopping at a position 1.5m away from 1# driving roller.

2. And (5) processing after clamping. Continuously clamping the clamping plate → checking and processing the motor band-type brake of the transmission roller 1#, -operating the button to loosen the clamping plate → recovering the power supply of the loop winding mechanism → recovering the tension of the inlet loop → inching the transmission roller 1#, advancing the tail part of the strip steel to the inverted welding position → welding the strip steel before and after welding → recovering the normal production running state.

Comparative example

In the prior art, the accident that the tail part of the strip steel breaks away from the No. 1 driving roller and enters an inlet loop occurs 7 times every year.

After the invention is applied, the accidents that the tail part of the strip steel is separated from the No. 1 driving roller and enters the inlet loop do not occur.

The invention reduces the tension of the inlet loop during welding, thereby reducing the speed and the probability of the strip steel tail separation and providing a time guarantee for clamping the strip steel tail by the clamping plate. A photoelectric sensor is arranged behind the welding machine for detection, and a method of double protection of loop tension cutting and clamping of a clamping plate is adopted, so that reliable guarantee is provided for preventing the tail of the strip steel from separating.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.