Online switching method of roller coating unit

Abstract

The invention discloses an online switching method of a roller coating unit, which comprises the following steps of: feeding a first roller coating machine into a line, synchronously offline a second roller coating machine, arranging a first carrier roller and a second carrier roller at an ascending position, arranging a third carrier roller at a descending position, or feeding the second roller coating machine into the line, and synchronously offline the first roller coating machine; at the moment, the first carrier roller is kept at the rising position, and the second carrier roller and the third carrier roller are adjusted to the corresponding positions according to the on-site actual condition so as to change the position of a steel wire, and the running strip steel is ensured not to influence the wire feeding and wire discharging of the first roller coater or the second roller coater, so that the roller coater is replaced on line on the premise of not stopping the wire, and the production efficiency is improved. The continuous and normal annealing treatment of the strip steel in the previous procedure can be ensured, the coating of the strip steel can be prevented from being scraped, the strip steel cannot be accumulated in a coating station of the roller coating unit, the quality of the strip steel product can be ensured, and meanwhile, the overall operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cold-rolled strip steel coating production, and in particular to an online switching method for a roller coating unit. Background Art

[0002] In the production process of the cold-rolled silicon steel continuous annealing coating unit, it is usually necessary to anneal the strip first, and then use a roller coater to coat a certain thickness of insulating coating liquid on the surface of the strip, and then put it into a drying furnace for high-temperature drying to form an insulating coating, so that the silicon steel products have good insulation, rust resistance and processability.

[0003] Generally, before the roller coater coats the strip with coating liquid, the strip will be continuously annealed in a tunnel annealing furnace. However, due to an unexpected failure of the running roller coater or replacement of raw materials during the production process, it is necessary to switch to another roller coater online. During the period of time when the roller coater is replaced, part of the strip will be controlled to stay in the annealing furnace, or the transfer speed of the strip will be greatly reduced so that the strip will not accumulate at the station where the next roller coater is located. However, this will cause the residence time or annealing time of some strips in the annealing furnace to exceed the specified range, thereby causing the quality of some strips to be degraded due to abnormal annealing, or even have to be scrapped.

[0004] There are also some operating methods that use the continued informal production of strip samples, making them stay or slow down in the annealing furnace as a substitute for normal strip, and then the roller coater is switched online. This will also lead to low overall operating efficiency of the cold-rolled silicon steel continuous annealing coating unit. Summary of the invention

[0005] To this end, in order to solve the above-mentioned problem, the present invention provides an online switching method for a roller coating machine group, which can replace the roller coating machine online without stopping the line to ensure continuous and normal annealing treatment of the strip steel in the previous process, thereby ensuring the quality of the strip steel product and achieving an improvement in the overall operating efficiency.

[0006] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0007] The present invention provides an online switching method of a roller coating machine group, comprising the following steps: S1, arranging a first roller, a second roller and a third roller that can be raised and lowered in sequence along a steel strip passing line, and arranging a first roller coating machine that can be offline between the first roller and the second roller, and arranging a second roller coating machine that can be offline between the second roller and the third roller; S2, bringing the first roller coating machine online, and synchronously taking the second roller coating machine offline, at this time, both the first roller and the second roller are set in an ascending position, and the third roller is set in a descending position, so as to change the position of the steel strip passing line, and ensure that the running strip steel does not affect the first roller coating machine's entry into the line and the second roller coating machine's offline, thereby ensuring that the strip steel of the previous process is continuously and normally annealed, and at the same time ensuring that the strip steel coating is not scratched; S3, when the first roller coating machine is online, keeping the first roller In the raised position, the second roller and the third roller are both adjusted to the lowered position to prevent the coated strip coating from being rubbed off by the second roller and the third roller; S4, the second roller coater is brought into the line, and the first roller coater is synchronously offline. At this time, the first roller is kept in the raised position, and the second roller and the third roller are adjusted to the corresponding positions according to the actual situation on site to change the position of the steel line and ensure that the running strip does not affect the second roller coater's introduction and the first roller coater is offline, thereby ensuring the continuous normal annealing treatment of the strip in the previous process, and at the same time ensuring that the strip coating is not scratched; S5, when the second roller coater is running online, the first roller is kept in the raised position, and the third roller is set in the lowered position to prevent the coated strip coating from being rubbed off by the third roller, and the second roller is adjusted to the corresponding position according to the actual situation on site.

[0008] Furthermore, in S1, the starting end of the steel wire is connected to the discharge port of the strip annealing furnace.

[0009] Furthermore, in S1, the end of the steel wire is connected to the entrance of a drying furnace for drying the coating.

[0010] Furthermore, in S5, when the position of the steel wire meets the wire feeding requirement of the second roller coater, the second roller and the third roller are still kept in the lowered position to prevent the strip coating coated by the first roller coater from being damaged by the second roller and the third roller.

[0011] Further, in S5, when the second roller and the third roller are both in the lowered position and the corresponding steel wire position does not meet the wire feeding requirement of the second roller coater, the second roller and the third roller are each raised to the raised position, or all are raised to the raised position.

[0012] Furthermore, when the first roller coater and the second roller coater are both offline, the roller heights of the first roller, the second roller and the third roller are adjusted to preset initial positions to ensure that the steel line between the first roller and the second roller allows the first roller coater to enter the line, and at the same time ensure that the steel line between the second roller and the third roller allows the second roller coater to enter the line, thereby ensuring that the first roller coater or the second roller coater can be switched to enter the line as needed.

[0013] The technical solution provided by the present invention has the following beneficial effects:

[0014] Through the mutual cooperation of the liftable first roller, the second roller and the third roller and the offline first roller coater or the second roller coater as a spare machine, the position of the steel line can be changed and the running strip steel can not affect the line feeding and offline of the first roller coater or the second roller coater, so as to realize the online replacement of the roller coater without stopping the line, to ensure the continuous and normal annealing treatment of the strip steel in the previous process, to ensure that the strip steel coating is not scratched, and the strip steel will not accumulate in the coating station of the roller coating unit, to ensure the quality of the strip steel product, and to realize the improvement of the overall operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a flow chart of an online switching method of a roller coating unit in an embodiment;

[0016] Figure 2 Shown is a schematic diagram of a roller coating unit in an embodiment;

[0017] Figure 3 Shown is a schematic diagram of a roller coating unit in an embodiment when the first roller coating machine and the second roller coating machine are both offline;

[0018] Figure 4 Shown is a schematic diagram of a roller coating unit in an embodiment when a first roller coating machine is online and a second roller coating machine is offline;

[0019] Figure 5 Shown is a schematic diagram of a roller coater group when the second roller coater is online and the first roller coater is offline in an embodiment. DETAILED DESCRIPTION

[0020] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0021] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1 As shown, this embodiment provides an online switching method for a roller coating machine group (hereinafter referred to as the online switching method), which is used to replace the roller coating machine online without stopping the entire production line. The specific online switching method includes the following steps:

[0023] Step S1, such as Figure 2 As shown, the liftable first roller 3, the second roller 4 and the third roller 5 are arranged in sequence along the steel strip passing line 6, and the offline first roller coater 1 is arranged between the first roller 3 and the second roller 4, and the offline second roller coater 2 is arranged between the second roller 4 and the third roller 5.

[0024] Step S2, such as Figure 4 As shown, the first roller coater 1 is brought online, and the second roller coater 2 is synchronously offline. At this time, the first roller 3 and the second roller 4 are both set in the raised position, and the third roller 5 is set in the lowered position to change the position of the steel wire and ensure that the running strip does not affect the first roller coater 1 and the second roller coater 2 offline, thereby ensuring continuous and normal annealing of the strip in the previous process, and at the same time ensuring that the strip coating is not scratched, and the height of the raised position of the same roller is greater than the height of its lowered position.

[0025] Step S3, when the first roller coater 1 is running online, the first roller 3 is kept in the raised position, and the second roller 4 and the third roller 5 are adjusted to the lowered position to prevent the coated strip coating from being rubbed off by the second roller 4 and the third roller 5.

[0026] Step S4, such as Figure 5 As shown, the second roller coater 2 is brought online and the first roller coater 1 is taken offline synchronously. At this time, the first roller 3 is kept in the raised position, and the second roller 4 and the third roller 5 are adjusted to the corresponding positions according to the actual situation on site to change the position of the steel wire and ensure that the running strip does not affect the second roller coater 2 being brought online and the first roller coater 1 being taken offline, thereby ensuring the continuous and normal annealing treatment of the strip in the previous process and ensuring that the strip coating is not scratched.

[0027] Step S5, when the second roller coater 2 is running online, the first roller 3 is kept in the raised position and the third roller 5 is set in the lowered position to prevent the coated strip coating from being rubbed off by the third roller 5, and the second roller 4 adjusts the corresponding position according to the actual situation on site.

[0028] More specifically, the starting end of the steel wire 6 is connected to the discharge port of the strip annealing furnace, and the end of the steel wire 6 is connected to the entrance of the drying furnace 7 for coating drying, and then through the cooperation of three lifting rollers and two offline roller coaters, a coating is formed. Figure 2The roller coating unit shown is used for continuous coating of cold-rolled silicon steel.

[0029] In this embodiment, the raised position of the first roller 3, the second roller 4 and the third roller 5 is an extended position for supporting the strip and preventing the strip from sagging, and the rollers of the first roller 3, the second roller 4 and the third roller 5 are driven to rise and fall by corresponding hydraulic cylinders, and the actual lifting height is detected by corresponding sensors.

[0030] The descending positions of the first roller 3, the second roller 4 and the third roller 5 are retracted positions away from the surface of the steel strip and not in direct contact with the steel strip, so as to prevent the coated steel strip coating from being rubbed off by the corresponding rollers.

[0031] The bottom of the first roller coater 1 and the second roller coater 2 are both installed with a transverse movement mechanism and a matching track. When the first roller coater 1 or the second roller coater 2 needs to be brought online or offline, the transverse movement mechanism and the track cooperate to realize that the first roller coater 1 or the second roller coater 2 is driven by the corresponding transverse movement mechanism and moves back and forth on the track to complete the switching of the first roller coater 1 or the second roller coater 2 into or out of the coating position or coating station of the roller coater group.

[0032] like Figure 3 As shown, when the first roller coater 1 and the second roller coater 2 are both offline, the roller heights of the first roller 3, the second roller 4 and the third roller 5 are adjusted to the preset initial positions to ensure that the steel wire 6 between the first roller 3 and the second roller 4 allows the first roller coater 1 to enter the line, and at the same time ensure that the steel wire 6 between the second roller 4 and the third roller 5 allows the second roller coater 2 to enter the line, thereby ensuring that either the first roller coater 1 or the second roller coater 2 can be switched to enter the line as needed.

[0033] The steel strip passing line position in the coating station is related to the strip tension, the position of the entrance roller near the annealing furnace exit, the entrance position or furnace door position of the drying furnace 7, the rollers in the drying furnace 7, and the first roller coater 1 and the second roller coater 2 in the online state, and the strip tension is a stable set value.

[0034] Through the mutual cooperation of the liftable first roller 3, the second roller 4 and the third roller 5 and the offline first roller coater 1 or the second roller coater 2 as a spare machine, the position of the strip line can be changed, and it can be ensured that the strip does not scrape the furnace door of the drying furnace 7 to avoid damage to the strip. At the same time, the roller coater can be replaced online without stopping the line to ensure continuous and normal annealing of the strip in the previous process, and the strip will not be accumulated in the coating station of the roller coating unit, which can also ensure the quality of the strip product and improve the overall operating efficiency.

[0035] Of course, in step S2 of other embodiments, the roller heights of the first roller 3, the second roller 4 and the third roller 5 are adjusted to preset initial positions to ensure that the steel wire 6 between the first roller 3 and the second roller 4 allows the first roller coater 1 to enter the line, thereby ensuring that the first roller coater 1 can enter the line as needed, while the second roller coater 2 is already in online operation.

[0036] Or adjust the roller heights of the first roller 3, the second roller 4 and the third roller 5 to a preset initial position to ensure that the steel wire 6 between the second roller 4 and the third roller 5 allows the second roller coater 2 to enter the line, thereby ensuring that the second roller coater 2 can enter the line as needed, while the first roller coater 1 is already running online.

[0037] In step S5 of another preferred embodiment, when the position of the steel wire 6 meets the feed requirement of the second roller coater 2, the second roller 4 and the third roller 5 are still maintained in the lowered position to prevent the strip coating coated by the first roller coater 1 from being damaged by the second roller 4 and the third roller 5.

[0038] In step S5 of another preferred embodiment, when the second roller 4 and the third roller 5 are both in the lowered position and the corresponding position of the steel line 6 does not meet the feeding requirement of the second roller coater 2, the second roller 4 and the third roller 5 are each raised to the raised position, or all of them are raised to the raised position, all of which can achieve the feeding of the second roller coater 2. When the second roller coater 2 needs to be switched, the roller coater will be switched near the weld of the strip, and at the exit of the drying furnace 7, the strip parts before and after the weld are generally cut off. Therefore, even if part of the coating on the strip is rubbed off by the rollers, the amount of strip cut off is within the allowable range of normal production, and will not cause too much strip to be scrapped.

[0039] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An online switching method for a roller coating unit, characterized in that: The steps include: S1, arranging a first roller, a second roller and a third roller that can be raised and lowered in sequence along a steel strip passing line, and arranging a first roller coating machine that can be offline between the first roller and the second roller, and arranging a second roller coating machine that can be offline between the second roller and the third roller; S2, the first roller coating machine is brought into line, and the second roller coating machine is synchronously offline. At this time, the first roller and the second roller are both set in the ascending position, and the third roller is set in the descending position, so as to change the position of the steel line, and ensure that the running strip steel does not affect the first roller coating machine and the second roller coating machine is offline, thereby ensuring the continuous and normal annealing of the strip steel in the previous process, and at the same time ensuring that the strip steel coating is not scratched; S3, when the first roller coater is running online, the first roller is kept in the raised position, and the second roller and the third roller are adjusted to the lowered position to prevent the coated strip coating from being rubbed off by the second roller and the third roller; S4, the second roller coating machine is brought into line, and the first roller coating machine is taken offline synchronously. At this time, the first roller is kept in the raised position, and the second roller and the third roller are adjusted to the corresponding positions according to the actual situation on site to change the position of the steel line, and ensure that the running strip steel does not affect the second roller coating machine and the first roller coating machine is taken offline, thereby ensuring the continuous and normal annealing treatment of the strip steel in the previous process, and at the same time ensuring that the strip steel coating is not scratched; S5, when the second roller coater is running online, the first roller is kept in the raised position and the third roller is set in the lowered position to prevent the coated strip coating from being rubbed off by the third roller, and the second roller adjusts the corresponding position according to the actual situation on site.

2. The online switching method of the roller coating unit according to claim 1, characterized in that: In S1, the starting end of the steel wire is connected to the discharge port of the strip annealing furnace.

3. The online switching method of the roller coating unit according to claim 1 or 2, characterized in that: In S1, the end of the steel wire is connected to the entrance of a drying furnace for drying the coating.

4. The online switching method of the roller coating unit according to claim 1, characterized in that: In S5, when the position of the steel wire meets the wire feeding requirement of the second roller coater, the second and third rollers are still kept in the lowered position to prevent the strip coating coated by the first roller coater from being damaged by the second and third rollers.

5. The online switching method of the roller coating unit according to claim 1, characterized in that: In S5, when the second roller and the third roller are both in the lowered position and the corresponding steel wire position does not meet the wire feeding requirement of the second roller coater, the second roller and the third roller are each raised to the raised position, or all are raised to the raised position.

6. The online switching method of the roller coating unit according to claim 1, characterized in that: When the first roller coater and the second roller coater are both offline, the roller heights of the first roller, the second roller and the third roller are adjusted to the preset initial positions to ensure that the steel line between the first roller and the second roller allows the first roller coater to enter the line, and at the same time ensure that the steel line between the second roller and the third roller allows the second roller coater to enter the line, thereby ensuring that the first roller coater or the second roller coater can be switched to enter the line as needed.

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