Steel strip threading device and steel strip threading method in continuous processing line

Abstract

To provide a steel strip threading device and a steel strip threading method in a continuous processing line that can prevent meandering and entanglement of a sling by applying a constant tension to the sling coupled to a leading end of a steel strip during a strip-extraction process and a strip-threading process of the steel strip.SOLUTION: A steel strip threading device 10 in a continuous processing line includes: a reel 22 that pays out a sling 40 coupled to a leading end Sa in a threading direction of a steel strip S while applying a first tension F1 to the sling 40 during a strip-extraction process of the steel strip S, and that winds the sling 40 coupled to the leading end Sa in the threading direction of the steel strip S while applying a second tension F2 to the sling 40 during a strip-threading process of the steel strip S; an electric motor 24 that rotates the reel 22 in a sling winding direction such that the first tension F1 is applied to the sling 40 when the reel 22 pays out the sling 40, and the second tension F2 is applied to the sling 40 when the reel 22 winds the sling 40; and a control panel 25 that controls driving of the electric motor 24.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a steel strip threading device for a continuous processing line, which is used in a steel strip blanking process to remove the steel strip from the continuous processing line and in a steel strip threading process to allow the steel strip to be threaded again on the continuous processing line, and a steel strip threading method for a continuous processing line using this steel strip threading device. [Background technology]

[0002] Hot-rolled steel strips have scale (oxides) formed on their surfaces. Therefore, after hot rolling, the hot-rolled steel strips are pickled in a pickling line to remove the scale formed on the surface of the hot-rolled steel strips. Patent Document 1 discloses a method and equipment for pickling a steel strip. In this pickling line, it is necessary to periodically repair or replace table rolls, bridle rolls, etc. When performing this periodic repair, it is necessary to ensure that no steel strip is threaded on the pickling line where the table roll or bridle roll to be repaired is located (steel strip blanking process).Once the periodic repair is completed, the pickling line is once again returned to a state where steel strips can be threaded (steel strip threading process).

[0003] Conventionally, in this steel strip blanking process, the rear end of a sling, the front end of which is wound on a winder, is connected to the front end of the steel strip in the threading direction on the pickling line, and the steel strip is reversed and retreated using line power (reverse rotation of the bridle roll), with the sling interposed on the pickling line, and the steel strip on the pickling line is replaced with the sling.The rear end of this replaced sling is then detached from the front end of the retreating steel strip, and the sling is removed from the pickling line.

[0004] In the steel strip threading process, the rear end of the sling, the front end of which is wound on a winding machine, is connected to the front end of the steel strip in the threading direction as it retreats on the pickling line, and the steel strip is driven forward (rearward) by line power (forward rotation of the bridle roll) to move forward and pay out the sling to the front of the steel strip.The paid-out sling is then collected and wound up on the winding machine, and the rear end of the sling is detached from the front end of the steel strip and removed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-87876 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional steel strip blanking and threading processes have the following problems. That is, in the steel strip blanking process, when the steel strip is reversed by the line power, the sling is pulled by the steel strip, so to avoid danger, workers must work without touching the sling. However, if the sling becomes tangled or entangled, the steel strip blanking process will not proceed smoothly, so the worker must correct it. In this case, if the conditions are not set correctly and the sling becomes tangled or entangled, there is a risk that the worker will be pulled by the sling.

[0007] Furthermore, in the steel strip threading process, workers retrieve the slings that have been let out in front of the steel strip and wind them up on a winding machine. In this case, the slings are let out in front of the steel strip by running the steel strip in the forward direction (rearward) using line power (forward rotation of the bridle roll), so they often become tangled in complex formations without tension applied, and there is a risk that workers will be pulled by the slings if the line power is reversed (reverse rotation of the bridle roll) by mistake. For this reason, during the steel strip blanking and threading processes, it is preferable to apply a certain tension to the sling attached to the front end of the steel strip in the threading direction to prevent the sling from meandering or becoming tangled.

[0008] Therefore, the present invention has been made to solve this conventional problem, and its object is to provide a steel strip threading device and a steel strip threading method in a continuous processing line that can apply a constant tension to a sling attached to the front end of the steel strip in the threading direction during the steel strip punching process and the steel strip threading process, thereby preventing the sling from meandering or tangling. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, one aspect of the present invention provides a steel strip threading device for a continuous processing line, which is used during a steel strip blanking process to make the continuous processing line into a state where there is no steel strip threaded on it, and a steel strip threading process to make the continuous processing line into a state where the steel strip is threaded again, and during the steel strip blanking process, a sling is wound up, and the rear end of the sling is connected to the front end of the steel strip in the threading direction, and the sling is unwound while applying a first tension to the sling, The gist of the system is that it comprises: a reel that winds up a sling, with the rear end of the sling being paid out connected to the front end of the steel strip in the plate threading direction during the plate threading process, while applying a second tension to the sling that is smaller than the first tension; an electric motor that rotates the reel in the sling winding direction so that the sling is subjected to the first tension when the reel pays out the sling and to the second tension when the reel winds up the sling; and a control panel that controls the drive of the electric motor.

[0010] In addition, another aspect of the present invention is a method of threading a steel strip on a continuous processing line, which uses the above-mentioned steel strip threading device to perform a steel strip blanking process to remove the steel strip from the continuous processing line, and a strip threading process to return the steel strip to a state where it can be threaded again on the continuous processing line. [Effects of the Invention]

[0011] According to the steel strip threading device and steel strip threading method in a continuous processing line of the present invention, a steel strip threading device and steel strip threading method can be provided that can apply a constant tension to the sling attached to the front end of the steel strip in the threading direction during the steel strip punching process and plate threading process, preventing the sling from meandering or tangling. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic configuration diagram of a part of a pickling line as a continuous processing line to which a steel strip threading device according to one embodiment of the present invention is applied. [Figure 2] FIG. 2 is a right side view of the steel strip threading device shown in FIG. [Figure 3] FIG. 2 is a rear view of the steel strip threading device shown in FIG. [Figure 4] 2 is a diagram for explaining a pendant switch as a remote control device in the steel strip threading device shown in FIG. 1. FIG. [Figure 5] This is an illustration explaining the steel strip punching process using a steel strip threading device, showing the initial stage in which a sling with the rear end wound on a reel connected to the front end of the steel strip in the threading direction is paid out from the reel. [Figure 6] This is an illustration explaining the steel strip punching process using a steel strip threading device, showing the final stage in which the sling, with the rear end of the sling wound on the reel connected to the front end of the steel strip in the threading direction, has been unwound from the reel. [Figure 7] This is an illustration explaining the steel strip threading process using a steel strip threading device, showing the initial stage of winding a sling onto a reel, with the rear end of the sling being unwound from the reel and connected to the front end of the steel strip in the threading direction. [Figure 8] This is an illustration explaining the steel strip threading process using a steel strip threading device, showing the final stage in which the rear end of the sling being paid out from the reel is connected to the front end of the steel strip in the threading direction and the sling is wound onto the reel. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below are examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the materials, shapes, structures, arrangements, etc. of the components. In addition, the drawings are schematic, and therefore it should be noted that the relationship between thickness and planar dimensions, ratios, etc. may differ from the actual relationship, and the dimensional relationships and ratios may differ between the drawings.

[0014] FIG. 1 shows a schematic configuration of a part of a pickling line as a continuous processing line to which a steel strip threading device according to one embodiment of the present invention is applied. In the pickling line 1 shown in FIG. 1 as a continuous processing line, a hot-rolled hot-rolled steel strip (hereinafter referred to as "steel strip") S is pickled in a pickling bath (not shown), dried in a dryer (not shown), and then edge-slit on both widthwise edges of the steel strip S using a trimmer 2. In the pickling line 1, the edge-slit steel strip S is transported in the sheet passing direction indicated by arrow A by a plurality of bridle rolls 7, while inspection of the front and back surfaces of the steel strip S for defects is carried out in an inspection room 3. In the pickling line 1, the steel strip S inspected in the inspection room 3 is transported in the sheet passing direction by a plurality of table rolls 8, and rust-preventive oil is applied to the front and back surfaces of the steel strip S using an electrostatic oil applicator 4. In the pickling line 1, defective portions of the steel strip S coated with rust-preventive oil are cut off using a flying shear 5, and the steel strip S from which the defective portions have been cut is wound into a coil by a winding device 6.

[0015] In this pickling line 1, for example, the bridle roll 7 may be periodically repaired or replaced. When performing this periodic repair, it is necessary to ensure that no steel strip S is threaded at the location of the bridle roll 7 to be repaired on the pickling line 1 (the strip punching process for the steel strip S, see Figures 5 and 6). Then, after the periodic repair is completed, the pickling line 1 is again brought into a state where the steel strip is threaded (the strip threading process for the steel strip S, see Figures 7 and 8).

[0016] In the pickling line 1 of this embodiment, in order to perform the blanking process and the plate threading process of the steel strip S, a steel strip threading device 10 is installed on a stand 9 provided on the outlet side of the electrostatic oil application device 4, and the blanking process and the plate threading process are carried out using the steel strip threading device 10. As shown in FIGS. 1 to 3, the steel strip threading device 10 includes a strip threading device main body 20 and a pendant switch 30. The plate threading device main body 20 comprises a box-shaped housing 21, a reel 22 rotatably supported in the housing 21, an electric motor 24 housed within the housing 21, and a control panel 25 housed within the housing 21. The housing 21 of the strip threading device main body 20 is placed on a stand 9 provided on the outlet side of the electrostatic oil application device 4.

[0017] During the blanking process of the steel strip S, the reel 22 pays out the sling 40 with the rear end 40a of the wound sling 40 connected to the front end Sa in the strip threading direction (direction indicated by arrow A) of the steel strip S, while applying a first tension F1 to the sling 40, as shown in Figures 5 and 6. Also, during the strip threading process of the steel strip S, the reel 22 pays out the sling 40 with the rear end 40a of the fed sling 40 connected to the front end Sa in the strip threading direction, while applying a second tension F2 that is smaller than the first tension F1 to the sling 40, as shown in Figures 7 and 8. The front end of the sling 40 in the strip threading direction is fixed to a sling fixing portion 22c, which will be described later.

[0018] During the blanking process of the steel strip S, as shown in Figures 5 and 6, the steel strip S moves in the opposite direction (direction indicated by arrow B) to the threading direction (direction indicated by arrow A) due to a line power (the bridle roll 7 rotates in the reverse direction indicated by arrow b) to move the steel strip S in the opposite direction. On the other hand, during the strip threading process of the steel strip S, as shown in Figures 7 and 8, the steel strip S moves in the threading direction (direction indicated by arrow A) due to a line power (the bridle roll 7 rotates forward in the direction indicated by arrow c) to move the steel strip S in the threading direction.

[0019] As shown in FIGS. 1 to 3, the reel 22 includes a rotary shaft 22a rotatably supported on the rear wall of the housing 21, and a pair of reel plates 22b fixed to the rotary shaft 22a for winding and unwinding the sling 40. A sling fixing portion 22c for fixing the front end of the sling 40 in the passing direction is provided on the rotary shaft 22a. In this embodiment, the sling 40 is a PP sling rope made of polypropylene, with a width of 80 - 120 mm, a thickness of 3 - 8 mm, and a mass per unit length of 0.2 - 0.8 kg / m. Therefore, the reel 22 can wind a PP sling rope with a width of 80 - 120 mm × a thickness of 3 - 8 mm and a mass per unit length of 0.2 - 0.8 kg / m.

[0020] As shown in FIGS. 5 and 6, when the reel 22 pays out the sling 40, the electric motor 24 rotates the reel 22 in the sling winding direction shown by the arrow a so that a first tension F1 in the direction opposite to the passing direction is applied to the sling 40. When paying out the sling 40, the rotation torque T of the reel 22 by the electric motor 24 is smaller than the first tension F1 of the sling 40 (T < F1). Therefore, the reel 22 rotates in the direction opposite to the sling winding direction, and the payout of the sling 40 and the punching of the steel strip S are performed without any trouble.

[0021] That is, in the steel strip punching process, when the line power for moving the steel strip S in the direction opposite to the passing direction (the direction shown by the arrow B) stops, the reel 22 rotates in the sling winding direction by the rotation torque T of the reel 22 by the electric motor 24, applying a tension smaller than the first tension F1 to the sling 40. When the steel strip S is moved in the direction opposite to the passing direction (the direction shown by the arrow B) by the line power, the reel 22 rotates in the direction opposite to the sling winding direction against the rotation torque T of the reel 22 by the electric motor 24, and pays out the sling 40 while applying the first tension F1 to the sling 40.

[0022] 7 and 8, when the reel 22 winds up the sling 40, the electric motor 24 rotates the reel 22 in the sling winding direction indicated by arrow a so that a constant second tension F2 is applied to the sling 40 in the direction opposite to the strip threading direction. When winding up the sling 40, the rotational torque T of the reel 22 in the sling winding direction by the electric motor 24 is greater than the second tension F2 of the sling 40 (T>F2), so the reel 22 rotates in the sling winding direction, allowing the winding of the sling 40 and the threading of the steel strip S to be carried out without any hindrance.

[0023] In other words, during the steel strip S plate threading process, when the line power moving the steel strip S in the plate threading direction (direction indicated by arrow A) is stopped, the reel 22 rotates in the sling winding direction due to the rotational torque T of the reel 22 from the electric motor 24, applying a tension greater than the second tension F2 to the sling 40, and when the line power is driven to move the steel strip S in the plate threading direction (direction indicated by arrow A), the reel 22 continues to rotate in the sling winding direction due to the rotational torque T of the reel 22 from the electric motor 24, and winds up the sling 40 while applying the second tension F2 to the sling 40.

[0024] As shown in FIG. 3, the electric motor 24 has a motor shaft 24a connected to a rotation shaft 22a of the reel 22 via a reducer 23. The control panel 25 is also connected to the electric motor 24 and controls the driving of the electric motor 24 . Here, the control panel 25 controls the operation of the electric motor 24 so that the sling winding speed of the reel 22 in the sling winding direction driven by the electric motor 24 is 20-50 m / min and the acceleration time is 0.2-1.0 seconds when the reel 22 pays out and takes up the sling 40. If the sling winding speed of the reel 22 in the sling winding direction driven by the electric motor 24 is slower than 20 m / min, the operability of the reel 22 paying out and taking up the sling 40 is poor. On the other hand, if the sling winding speed is faster than 50 m / min, there is a risk that the sling 40 will meander when the reel 22 pays out and takes up the sling 40. Furthermore, if the acceleration time is faster than 0.2, there is a risk that the sling 40 will meander when the reel 22 pays out and takes up the sling 40. On the other hand, if the acceleration time is slower than 1.0 second, the workability when the reel 22 pays out and retracts the sling 40 is poor.

[0025] The control panel 25 also controls the operation of the electric motor 24 so that the rotational torque T of the reel 22 generated by the electric motor 24 is such that the first tension F1 applied to the sling 40 when the reel 22 pays out the sling 40 is a tension set arbitrarily within the range of 35-150 kgf. The control panel 25 also controls the operation of the electric motor 24 so that the rotational torque T of the reel 22 generated by the electric motor 24 is such that the second tension F2 applied to the sling 40 when the reel 22 reels out and reels out the sling 40 is a tension set arbitrarily within the range of 35-150 kgf. If the rotational torque T of the reel 22 generated by the electric motor 24 is such that the first tension F1 and second tension F2 applied to the sling 40 when the reel 22 pays out and reels out the sling 40 are less than 35 kgf, there is a risk that the sling 40 will meander when the reel 22 reels out and reels out the sling 40. On the other hand, if the first tension F1 and the second tension F2 applied to the sling 40 are greater than 150 kgf, the sling 40 may break.

[0026] A power cable inlet 21a is provided in the housing 21 of the strip threading device main body 20. A 220V AC power cable (not shown) with an outlet (not shown) is drawn into this power cable inlet 21a, and this power cable is connected to a control panel 25. Next, the pendant switch 30 drives the electric motor 24 when turned ON and stops the driving of the electric motor 24 when turned OFF, and is remotely connected to the control panel 25 by a pendant switch cable 34 via the pendant switch cable inlet 21b provided in the housing 21.

[0027] Specifically, as shown in Fig. 4, the pendant switch 30 includes an operation switch 31, a brake release switch 32, and an emergency stop switch 33. When an operator presses (turns ON) the operation switch 31, the operation switch 31 lights up and the electric motor 24 starts to operate. When the operator presses (turns OFF) the operation switch 31 while the electric motor 24 is running, the operation of the electric motor 24 stops. When the operator presses the brake release switch 32, a brake (not shown) is released. Furthermore, when the operator presses the emergency stop switch 33 when the operating state of the electric motor 24 is abnormal, the electric motor 24 stops.

[0028] Next, the blanking process and the threading process of the steel strip S using the steel strip threading device 10 will be described with reference to Figures 5 to 8. Figure 5 shows the initial stage of the blanking process of the steel strip S using the steel strip threading device 10, in which the sling 40, with the rear end 40a of the sling 40 wound around the reel 22 and connected to the front end Sa of the steel strip S in the threading direction, is unwound from the reel 22. Figure 6 shows the final stage of the blanking process of the steel strip S using the steel strip threading device 10, in which the sling 40, with the rear end 40a of the sling 40 wound around the reel 22 and connected to the front end Sa of the steel strip S in the threading direction, is unwound from the reel 22. Figure 7 shows the initial stage of the steel strip threading process using the steel strip threading device, in which the sling 40, with the rear end 40a of the sling 40 being unwound from the reel 22 and connected to the front end Sa of the steel strip S in the threading direction, is wound onto the reel 22. Figure 8 shows the final stage of the steel strip threading process using the steel strip threading device 10, in which the sling 40, with the rear end 40a of the sling 40 being unwound from the reel 22 and connected to the front end Sa of the steel strip S in the threading direction, is wound onto the reel 22.

[0029] First, during the strip punching process of the steel strip S using the steel strip threading device 10, as shown in Figure 5, an operator enters the pickling line 1 and connects the rear end 40a of the sling 40 wound on the reel 22 to the front end Sa of the steel strip S in the threading direction. Next, the worker goes outside the pickling line 1 and, while the line power for moving the steel strip S in the direction opposite to the strip threading direction (the direction indicated by arrow B) is stopped, presses the operation switch 31 of the pendant switch 30. This drives the electric motor 24, and the rotational torque T of the reel 22 generated by the electric motor 24 rotates the reel 22 in the sling winding direction indicated by arrow a, applying a tension to the sling 40 that is smaller than the first tension F1.

[0030] Next, the operator moves the steel strip S in a direction opposite to the strip passing direction (the direction indicated by arrow B) using the line power. That is, the operator reverses the bridle roll 7 in the direction indicated by arrow b in FIG. 5 to move the steel strip S backward in a direction opposite to the strip passing direction (the direction indicated by arrow B). As a result, the reel 22 rotates in a direction opposite to the sling winding direction against the rotational torque T of the reel 22 by the electric motor 24, and pays out the sling 40 while applying the first tension F1 to the sling 40. When paying out the sling 40, since the rotational torque T of the reel 22 in the sling winding direction by the electric motor 24 is smaller than the first tension F1 of the sling 40 (T < F1), the reel 22 rotates in a direction opposite to the sling winding direction, and the payout of the sling 40 and the blanking of the steel strip S are performed without any trouble.

[0031] Then, as shown in FIG. 6, when the operator has backed the steel strip S until the front end Sa of the steel strip S has passed beyond the trimmer 2, the operator stops the line power, that is, the reverse rotation of the bridle roll 7, and presses the operation switch 31 of the pendant switch 30 again to stop the drive of the electric motor 24. Thereby, the blanking process of the steel strip S is completed. In this blanking process of the steel strip S, since it is necessary to move the front end Sa of the steel strip S backward until it has passed beyond the trimmer 2, the length of the sling 40 is preferably 150 m or more in consideration of the length from the reel 22 to the point where it has passed beyond the trimmer 2.

[0032] Then, the operator enters the pickling line 1, removes the rear end 40a of the sling 40 from the front end Sa in the strip passing direction of the steel strip S, removes the sling 40, and, for example, repairs or replaces the bridle roll 7. Also, during the strip passing process of the steel strip S using the steel strip passing device 10 after regular maintenance, as shown in FIG. 7, the operator enters the pickling line 1, connects the rear end 40a of the sling 40 being paid out from the reel 22 to the front end Sa in the strip passing direction of the steel strip S, and passes the sling 40 over the pickling line 1.

[0033] Next, the worker goes outside the pickling line 1 and, while the line power for moving the steel strip S in the threading direction indicated by arrow A is stopped, presses the operation switch 31 of the pendant switch 30. This drives the electric motor 24, and the rotational torque T of the reel 22 generated by the electric motor 24 rotates the reel 22 in the sling winding direction indicated by arrow a, applying a tension to the sling 40 that is greater than the second tension F2.

[0034] Next, the worker uses the line power to move the steel strip S in the threading direction indicated by arrow A. That is, the worker rotates the bridle roll 7 in the forward direction indicated by arrow c in Figure 7 to advance the steel strip S in the threading direction. At this time, the reel 22 continues to rotate in the sling winding direction due to the rotational torque T of the reel 22 generated by the electric motor 24, and winds up the sling 40 while applying a second tension F2 to the sling 40. During this winding up of the sling 40, the rotational torque T of the reel 22 generated by the electric motor 24 in the sling winding direction is greater than the second tension F2 of the sling 40 (T > F2), so the reel 22 rotates in the sling winding direction, allowing the winding of the sling 40 and the threading of the steel strip S to be carried out without any hindrance.

[0035] Then, as shown in Figure 8, when the front end Sa of the steel strip S has advanced past the bridle roll 7 located at the forefront in the strip threading direction, the worker stops the line power, i.e., the forward rotation of the bridle roll 7, and presses the operation switch 31 of the pendant switch 30 again to stop driving the electric motor 24. This completes the strip threading process of the steel strip S. Then, the worker enters the pickling line 1, removes the rear end 40a of the sling 40 from the front end Sa of the steel strip S in the running direction, removes the sling 40, and proceeds to normal operation.

[0036] Thus, the steel strip threading device 10 according to this embodiment is provided with a reel 22 that, during the blanking process of the steel strip S, pays out the sling 40 with the rear end 40a of the wound sling 40 connected to the front end Sa in the threading direction of the steel strip S while applying a first tension F1 to the sling 40, and that, during the threading process of the steel strip S, takes up the sling 40 with the rear end 40a of the fed sling 40 connected to the front end Sa in the threading direction of the steel strip S while applying a second tension F2 to the sling 40. The steel strip threading device 10 also includes an electric motor 24 that rotates the reel 22 in the sling winding direction so that the first tension F1 is applied to the sling 40 when the reel 22 pays out the sling 40 and the second tension F2 is applied to the sling 40 when the reel 22 winds up the sling 40, and a control panel 25 that controls the drive of the electric motor 24.

[0037] As a result, during the blanking and threading processes of the steel strip S, the first tension F1 and the second tension F2 are applied to the sling 40 connected to the front end Sa in the threading direction of the steel strip S, preventing meandering and tangling of the sling 40. Therefore, there is no need for the worker to correct the meandering or tangling of the sling 40, and the blanking and threading operations of the steel strip S can be carried out safely.

[0038] Furthermore, in the steel strip threading device 10 according to this embodiment, the control panel 25 controls the operation of the electric motor 24 so that the sling winding speed of the reel 22 in the sling winding direction by the electric motor 24 is 20-50 m / min and the acceleration time is 0.2-1.0 seconds when the reel 22 pays out and takes up the sling 40. This improves the operability when the reel 22 pays out and takes up the sling 40, and also prevents the risk of the sling 40 meandering.

[0039] Furthermore, in the steel strip threading device 10 according to this embodiment, the control panel 25 controls the drive of the electric motor 24 so that the rotational torque T of the reel 22 generated by the electric motor 24 is such that the first tension F1 applied to the sling 40 when the reel 22 pays out the sling 40 and the second tension F2 applied to the sling 40 when the reel 22 takes up the sling 40 are tensions set arbitrarily within the range of 35-150 kgf. This avoids the risk of the sling 40 meandering when the reel 22 pays out and takes up the sling 40, and also avoids the risk of the sling 40 breaking due to the first tension F1 and the second tension F2.

[0040] Furthermore, according to the steel strip threading device 10 of this embodiment, during the blanking process of the steel strip S, when the line power moving the steel strip S in the direction opposite to the threading direction is stopped, the reel 22 rotates in the sling winding direction by the rotational torque T of the reel 22 generated by the electric motor 24, thereby applying a tension smaller than the first tension F1 to the sling 40. Furthermore, when the steel strip S is moved in the direction opposite to the threading direction by the line power, the reel 22 rotates in the direction opposite to the sling winding direction against the rotational torque T of the reel 22 generated by the electric motor 24, thereby paying out the sling 40 while applying the first tension F1 to the sling 40. Furthermore, during the threading process of the steel strip S, when the line power moving the steel strip S in the threading direction is stopped, the reel 22 rotates in the sling winding direction by the rotational torque T of the reel 22 generated by the electric motor 24, thereby applying a tension larger than the second tension F2 to the sling 40. In addition, when the line power is driven to move the steel strip S in the strip threading direction, the reel 22 continues to rotate in the sling winding direction due to the rotational torque T of the reel 22 from the electric motor 24, and winds up the sling 40 while applying a second tension F2 to the sling 40.

[0041] As a result, during the blanking and threading processes of the steel strip S, a first tension F1 and a second tension F2 can be applied to the sling 40 connected to the front end Sa of the steel strip S in the threading direction before and after the steel strip S is moved by the line power, thereby appropriately preventing the sling 40 from meandering or tangling. In addition, according to the steel strip threading device 10 of this embodiment, a pendant switch 30 is remotely connected to the control panel 25, which drives the electric motor 24 when turned ON and stops the drive of the electric motor 24 when turned OFF.

[0042] As a result, during the blanking and threading processes of the steel strip S, the electric motor 24 can be turned on and off using a remotely controlled pendant switch 30, so that the electric motor 24 can be turned on and off from outside the pickling line 1, allowing the worker to safely perform the blanking and threading operations of the steel strip S without approaching the sling 40.

[0043] In addition, according to the steel strip threading method of this embodiment, a steel strip threading device 10 is used to perform a steel strip S strip punching process to ensure that no steel strip S is threaded on the pickling line 1, and a strip threading process to ensure that the steel strip S is threaded again on the pickling line 1. As a result, during the blanking and threading processes of the steel strip S, the first tension F1 and the second tension F2 are applied to the sling 40 connected to the front end Sa in the threading direction of the steel strip S, preventing meandering and tangling of the sling 40. Therefore, there is no need for the worker to correct the meandering or tangling of the sling 40, and the blanking and threading operations of the steel strip S can be carried out safely. Although the embodiment of the present invention has been described above, the present invention is not limited to this and various modifications and improvements can be made.

[0044] For example, the steel strip threading device 10 is installed on the outlet side of the electrostatic oil application device 4 in the pickling line 1 and is used to perform the strip punching process and strip threading process of the steel strip S, but the installation location to which the steel strip threading device 10 is applied is not limited to the outlet side of the electrostatic oil application device 4, and may be other locations in the pickling line 1 where objects that are subject to regular maintenance are located, such as near the pickling layer. In addition, the steel strip threading device 10 may be applied to continuous processing lines other than the pickling line 1, such as plating lines, cold rolling lines, surface treatment lines, etc., and may be used during the steel strip blanking process and steel strip threading process on the continuous processing line.

[0045] Furthermore, the pendant switch 30 is connected to the control panel 25 by a pendant switch cable 34, but it may also be configured with a transmitter and receiver so as to be connected to the control panel 25 wirelessly so as to be remotely operable. Furthermore, although the housing 21 of the steel strip threading device 10 is installed on the stand 9, it may be placed on a transportable device such as a traveling cart and transported. [Explanation of symbols]

[0046] 1. Pickling line (continuous processing line) 2 trimmers 3 Examination Room 4. Electrostatic oil applicator 5 Flying Sher 6 Winding device 7 Bridle Roll 8 table rolls 9 Mounting stand 10 Steel strip threading equipment 20 Strip threading device body 21. Cabinet 21a Power cable inlet 21b Pendant switch cable inlet 22 reels 22a Rotation axis 22b Reel board 22c sling fixing part 23 Reducer 24 Electric motor 24a motor shaft 25 Control Panel 30 Pendant switch 31 Operation switch 32 Brake release switch 33 Emergency stop switch 34 Pendant switch cable 40 Sling 40a rear end S Hot rolled steel strip (steel strip) Sa front end

Claims

1. A steel strip threading device for a continuous processing line, which is used in a steel strip blanking process to remove the steel strip from the continuous processing line and in a steel strip threading process to thread the steel strip again on the continuous processing line, a reel that, during the blanking process of the steel strip, pays out a sling in which the rear end of the wound sling is connected to the front end of the steel strip in the threading direction while applying a first tension to the sling, and that, during the plate threading process of the steel strip, pays out a sling in which the rear end of the wound sling is connected to the front end of the steel strip in the threading direction while applying a second tension smaller than the first tension to the sling; an electric motor that rotates the reel in a sling winding direction so that the first tension is applied to the sling when the reel pays out the sling and the second tension is applied to the sling when the reel winds up the sling; a control panel that controls the driving of the electric motor; A steel strip threading device comprising:

2. The steel strip threading device of claim 1, characterized in that the control panel controls the drive of the electric motor so that the sling winding speed in the sling winding direction of the reel driven by the electric motor is 20-50 m / min and the acceleration time is 0.2-1.0 seconds when the reel pays out and winds up the sling.

3. The control panel controls the drive of the electric motor so that the rotational torque of the reel by the electric motor is such that the first tension applied to the sling when the reel pays out the sling and the second tension applied to the sling when the reel winds up the sling are tensions that are arbitrarily set within the range of 35-150 kgf.

4. 2. The steel strip threading device according to claim 1, wherein, during the steel strip blanking process, when the line power moving the steel strip in the opposite direction to the strip threading direction is stopped, the reel rotates in the sling winding direction by the rotational torque of the reel generated by the electric motor, thereby applying a tension to the sling that is smaller than the first tension; and when the steel strip is moved in the opposite direction to the strip threading direction by the line power, the reel rotates in the opposite direction to the sling winding direction against the rotational torque of the reel generated by the electric motor, thereby paying out the sling while applying the first tension to it; and during the steel strip threading process, when the line power moving the steel strip in the strip threading direction is stopped, the reel rotates in the sling winding direction by the rotational torque of the reel generated by the electric motor, thereby applying a tension to the sling that is larger than the second tension to it; and when the line power is driven to move the steel strip in the strip threading direction, the reel continues to rotate in the sling winding direction by the rotational torque of the reel generated by the electric motor, thereby winding up the sling while applying the second tension to it.

5. 2. The steel strip threading device according to claim 1, wherein a pendant switch is remotely connected to the control panel, the pendant switch driving the electric motor when turned ON and stopping the driving of the electric motor when turned OFF.

6. A method for threading a steel strip on a continuous processing line, characterized in that a steel strip blanking process is carried out using a steel strip threading device as described in any one of claims 1 to 5, in which no steel strip is threaded on the continuous processing line, and a strip threading process is carried out in which the steel strip is threaded again on the continuous processing line.

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