An on-line switching method of a roll coater unit

Abstract

The application discloses an online switching method of a roller coating unit, which comprises the following steps: when the first roller coating machine is connected with a steel wire and the second roller coating machine is disconnected with the steel wire at the same time, the first supporting roller and the second supporting roller are arranged at the rising position, and the third supporting roller is arranged at the falling position; or when the second roller coating machine is connected with the steel wire and the first roller coating machine is disconnected with the steel wire at the same time, the first supporting roller is kept at the rising position, and the second supporting roller and the third supporting roller are adjusted at corresponding positions according to actual conditions on the spot, so as to change the position of the steel wire and ensure that the running steel belt does not affect the connection and disconnection of the first roller coating machine or the second roller coating machine, thereby realizing online replacement of the roller coating machine without stopping the steel wire, ensuring continuous and normal annealing treatment of the steel belt in the previous process, ensuring that the coating of the steel belt is not scraped, preventing the steel belt from being accumulated in the coating work station of the roller coating unit, ensuring the quality of the steel belt product, and improving the overall operation efficiency.

Description

Technical Field

[0001] This invention relates to the field of cold-rolled strip steel coating production technology, and in particular to an online switching method for roll coating units. Background Technology

[0002] In the production process of cold-rolled silicon steel continuous annealing coating unit, the strip steel is usually annealed first, and then a certain thickness of insulating coating liquid is applied to the surface of the strip steel by a roller coating machine. Then it is dried at high temperature in a drying oven to form an insulating coating, which gives the silicon steel product good insulation, rust prevention and processability.

[0003] Generally, before the strip steel is coated with the coating liquid by the roller coater, the strip steel undergoes continuous annealing in a tunnel annealing furnace. However, due to unexpected failures of the operating roller coater or changes in raw materials during production, it is necessary to switch to another roller coater online. During the period of switching roller coaters, some strip steel will be kept in the annealing furnace, or the strip steel transfer speed will be significantly reduced to prevent the strip steel from accumulating at the next roller coater station. However, this will cause some strip steel to stay in the annealing furnace for a longer period of time or for longer annealing than specified, resulting in abnormal annealing and a downgrade in the quality of some strip steel, or even the need for scrapping.

[0004] Some operations involve continuing informal production of strip samples, which are then kept in the annealing furnace or operated at reduced speed as a substitute for normal strip, before being switched to the roll coating machine online. This also leads to a lower overall operating efficiency of the cold-rolled silicon steel continuous annealing coating unit. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an online switching method for roller coating units, enabling online replacement of roller coating machines without interrupting the production line. This ensures continuous and normal annealing of the strip steel in the previous process, thereby guaranteeing the quality of the strip steel products and improving overall operational efficiency.

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

[0007] This invention provides an online switching method for a roller coating unit, comprising the following steps: S1, arranging a liftable first idler, a second idler, and a third idler sequentially along the strip's guide line, and placing an offline first roller coating machine between the first and second idlers, and an offline second roller coating machine between the second and third idlers; S2, bringing the first roller coating machine into the line, and simultaneously taking the second roller coating machine offline, at which point both the first and second idlers are placed in the rising position, and the third idler is placed in the falling position, to change the position of the guide line and ensure that the running strip does not affect the entry of the first roller coating machine or the offline operation of the second roller coating machine, thereby ensuring the continuous and normal annealing treatment of the strip in the previous process, while ensuring that the strip coating is not scratched; S3, when the first roller coating machine is running online, keeping the first idler... In the rising position, both the second and third idlers are adjusted to the falling position to prevent the coated strip from being rubbed off by the second and third idlers; S4, the second roller coater is brought into the line, and the first roller coater is simultaneously taken offline. At this time, the first idler is kept in the rising position, and the second and third idlers are adjusted to their corresponding positions according to the actual site conditions to change the position of the steel line and ensure that the running strip does not affect the entry of the second roller coater or the offline of the first roller coater, thereby ensuring the continuous and normal annealing treatment of the strip in the previous process, while ensuring that the strip coating is not scratched; S5, when the second roller coater is running online, the first idler is kept in the rising position, and the third idler is set to the falling position to prevent the coated strip coating from being rubbed off by the third idler, and the second idler is adjusted to its corresponding position according to the actual site conditions.

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

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

[0010] Furthermore, in S5, when the position of the steel wire meets the infeed requirements of the second roller coater, the second and third idlers are kept in the descending position to prevent the strip coating completed by the first roller coater from being damaged by the second and third idlers.

[0011] Furthermore, in S5, when the position of the steel wire corresponding to the lowered position of both the second and third idlers does not meet the line entry requirements of the second roller coating machine, the second and third idlers are each raised to the raised position, or both are raised to the raised position.

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

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

[0014] By coordinating the lifting first, second, and third idlers and using the offline first or second roller coater as a backup, the position of the steel wire can be changed, ensuring that the running strip does not affect the entry or exit of the first or second roller coater. This allows for online replacement of the roller coater without stopping the line, ensuring continuous and normal annealing of the strip in the previous process. It also prevents the strip coating from being scratched and avoids the strip accumulating in the coating station of the roller coater unit, thus ensuring the quality of the strip products and improving overall operational efficiency. Attached Figure Description

[0015] Figure 1 The diagram shows a flowchart of the online switching method for the roller coating unit in this embodiment;

[0016] Figure 2 The diagram shown is a schematic of the roller coating unit in the embodiment;

[0017] Figure 3 The diagram shown is a schematic of the roller coating unit when both the first and second roller coating machines are offline in the embodiment.

[0018] Figure 4 The diagram shown is a schematic of the roller coating unit when the first roller coating machine is online and the second roller coating machine is offline in the embodiment.

[0019] Figure 5 The diagram shown is a schematic of the roller coating unit in the embodiment when the second roller coating machine is online and the first roller coating machine is offline. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and 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 drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings 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 in conjunction with the accompanying drawings and specific embodiments.

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

[0023] Step S1, as follows Figure 2 As shown, the first roller 3, the second roller 4, and the third roller 5, which can be raised and lowered, are arranged sequentially along the steel strip passing line 6. The first roller coating machine 1, which can be operated offline, is set between the first roller 3 and the second roller 4, and the second roller coating machine 2, which can be operated offline, is set between the second roller 4 and the third roller 5.

[0024] Step S2, as follows Figure 4 As shown, the first roller coater 1 is brought into the line, and the second roller coater 2 is simultaneously taken offline. At this time, the first idler roller 3 and the second idler roller 4 are both set in the rising position, and the third idler roller 5 is set in the falling position to change the position of the steel wire and ensure that the running strip does not affect the entry of the first roller coater 1 and the offline of the second roller coater 2, thereby ensuring the continuous and normal annealing treatment of the strip in the previous process, while ensuring that the strip coating is not scratched, and the height of the rising position of the same idler roller is greater than the height of its falling position.

[0025] Step S3: When the first roller coating machine 1 is running online, the first idler roller 3 is kept in the rising position, and the second idler roller 4 and the third idler roller 5 are both adjusted to the falling position to prevent the coated strip from being rubbed off by the second idler roller 4 and the third idler roller 5.

[0026] Step S4, as follows Figure 5 As shown, the second roller coater 2 is brought into the line, and the first roller coater 1 is simultaneously taken offline. At this time, the first idler roller 3 is kept in the rising position, and the second idler roller 4 and the third idler roller 5 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 entry of the second roller coater 2 and the offline of the first roller coater 1, thereby ensuring the continuous and normal annealing treatment of the strip in the previous process, while ensuring that the strip coating is not scratched.

[0027] Step S5: When the second roller coating machine 2 is running online, the first idler roller 3 is kept in the rising position and the third idler roller 5 is set in the falling position to prevent the coated strip from being rubbed off by the third idler roller 5. The second idler roller 4 is adjusted to the appropriate position according to the actual situation on site.

[0028] More specifically, the starting end of the steel wire 6 is connected to the outlet of the strip annealing furnace, and the ending end of the steel wire 6 is connected to the inlet of the drying furnace 7 used for coating drying. Then, through the cooperation of three liftable rollers and two offline roller coating machines, a coating is formed as follows: Figure 2The roll coating unit shown is used for continuous coating operations of cold-rolled silicon steel.

[0029] In this embodiment, the rising positions of the first idler roller 3, the second idler roller 4, and the third idler roller 5 are extended positions used to support the strip and prevent the strip from sagging. The idler rollers of the first idler roller 3, the second idler roller 4, and the third idler roller 5 are driven to rise and fall by corresponding hydraulic cylinders, and the actual lifting height is detected by corresponding sensors.

[0030] The first idler roller 3, the second idler roller 4, and the third idler roller 5 are lowered to a retracted position that is far away from the strip surface and does not directly contact the strip, in order to prevent the coated strip coating from being rubbed off by the corresponding idler rollers.

[0031] The bottom of both the first roller coater 1 and the second roller coater 2 is equipped with a transverse mechanism and a matching track. When it is necessary to move the first roller coater 1 or the second roller coater 2 into or out of the coating unit, the transverse mechanism and the track work together to drive the first roller coater 1 or the second roller coater 2 to move back and forth on the track, so as to switch 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 unit.

[0032] like Figure 3 As shown, when both the first roller coater 1 and the second roller coater 2 are offline, the heights of the first idler roller 3, the second idler roller 4, and the third idler roller 5 are adjusted to the preset initial positions to ensure that the steel wire 6 between the first idler roller 3 and the second idler roller 4 allows the first roller coater 1 to enter the line, and at the same time, it ensures that the steel wire 6 between the second idler roller 4 and the third idler 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 position of the strip passing through the steel line in the coating station is related to the strip tension, the position of the inlet roller near the annealing furnace outlet, the inlet position or furnace door position of the drying furnace 7, the furnace rollers inside 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] By coordinating the lifting first roller 3, second roller 4, and third roller 5, and by using the offline first roller coater 1 or second roller coater 2 as a backup machine, the position of the strip steel line can be changed, ensuring that the strip steel does not scrape against the oven door of the drying oven 7 and thus avoids damage to the strip steel. At the same time, the roller coater can be changed online without stopping the line, so as to ensure the continuous and normal annealing treatment of the strip steel in the previous process. The strip steel will not accumulate in the coating station of the roller coater unit, which can also ensure the quality of the strip steel products and improve the overall operation efficiency.

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

[0036] Alternatively, the height of the first idler roller 3, the second idler roller 4, and the third idler roller 5 can be adjusted to a preset initial position to ensure that the steel wire 6 between the second idler roller 4 and the third idler roller 5 allows the second roller coating machine 2 to enter the line, thereby ensuring that the second roller coating machine 2 can enter the line as needed, while the first roller coating machine 1 is already running online.

[0037] In step S5 of another preferred embodiment, when the position of the steel wire 6 meets the infeed requirements of the second roller coater 2, the second idler roller 4 and the third idler roller 5 are still kept in the descending position to avoid the strip coating completed by the first roller coater 1 being damaged by the second idler roller 4 and the third idler roller 5.

[0038] In step S5 of another preferred embodiment, when the positions of the steel line 6 corresponding to the lowered positions of the second idler roller 4 and the third idler roller 5 do not meet the requirements for the entry of the second roller coating machine 2, the second idler roller 4 and the third idler roller 5 are each raised to the raised position, or both are raised to the raised position. Both of these can achieve the entry of the second roller coating machine 2. When the second roller coating machine 2 needs to be switched, the roller coating machine will be switched near the weld of the strip steel. Moreover, at the outlet of the drying oven 7, the strip steel before and after the weld is usually cut off. Therefore, even if part of the coating on the strip steel is rubbed off by the idler roller, the amount of strip steel cut off is within the allowable range of normal production and will not cause excessive strip steel scrap.

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

Claims

1. An online switching method for a roller coating unit, characterized in that, Includes the following steps: S1, the first, second and third rollers that can be raised and lowered are arranged sequentially along the steel strip's steel passage line, and the first roller coating machine that can be taken offline is set between the first and second rollers, and the second roller coating machine that can be taken offline is set between the second and third rollers. S2, the first roller coater is brought into the line and the second roller coater is taken offline simultaneously. At this time, the first and second idlers are both set in the rising position and the third idler is set in the falling position to change the position of the steel line and ensure that the running strip does not affect the entry of the first roller coater and the exit of the second roller coater, thereby ensuring the continuous and normal annealing treatment of the strip in the previous process, and ensuring that the strip coating is not scratched. S3, when the first roller coating machine is running online, keep the first idler roller in the rising position and adjust the second and third idler rollers to the falling position to prevent the coated strip from being rubbed off by the second and third idler rollers; S4, the second roller coater is brought into the line and the first roller coater is taken offline simultaneously. At this time, the first idler roller is kept in the rising position, and the second and third idlers rollers are adjusted to the corresponding positions according to the actual site conditions to change the position of the steel line and ensure that the running strip does not affect the entry of the second roller coater and the exit of the first roller coater, thereby ensuring the continuous and normal annealing treatment of the strip in the previous process, while ensuring that the strip coating is not scratched. S5. When the second roller coating machine is running online, the first idler roller is kept in the rising position and the third idler roller is set in the falling position to prevent the coating on the coated strip from being rubbed off by the third idler roller. The position of the second idler roller is adjusted according to the actual situation on site.

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

4. The online switching method for the roller coating unit according to claim 1, characterized in that: In S5, when the position of the steel wire meets the infeed requirements of the second roller coater, the second and third idlers are kept in the descending position to prevent the coating on the strip steel completed by the first roller coater from being damaged by the second and third idlers.

5. The online switching method for a roller coating unit according to claim 1, characterized in that: In S5, when the steel wire crossing positions corresponding to the lowering positions of the second and third idlers do not meet the line entry requirements of the second roller coating machine, the second and third idlers are each raised to the rising position, or both are raised to the rising position.

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

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