A control method for extending the service life of a roller universal shaft

Abstract

This invention discloses a control method for extending the service life of the roller table universal shaft. The rolling line PLC receives descaling settings from a host computer model and, based on slab production information, controls the operation of the descaling box and the descaling roller table. It also collects metal detector signals, issues start and stop signals for the spray system within the descaling box, and tracks and controls the position of the descaled slab, thereby extending the service life of the roller table universal shaft. This method avoids the drawbacks of existing technologies, increases hourly production capacity, reduces energy losses during abnormal downtime, and lowers equipment maintenance costs.

Description

Technical Field

[0001] The present invention relates to an automated control technology for a wide and thick plate descaling roller, and more particularly to a control method for extending the service life of a universal shaft of the roller. Background Art

[0002] Combine Figure 1 As shown, the rolling line area of ​​the 5m thick plate mill is equipped with a walking type heating furnace 1, a high-pressure water descaling box 2, a roughing mill 3, a finishing mill, an accelerated cooling and straightening area. The high-pressure water descaling box 2 is located on the descaling roller behind the walking type heating furnace 1. The high-pressure water descaling box 2 uses a jet of high-pressure water to remove the iron oxide scale on the upper and lower surfaces of the heated slab, especially the steel ingots in the heat treatment furnace and the annealing furnace. The high-pressure water descaling box 2 is welded from structural steel plates and has two sets of upper and lower manifolds. The two sets of manifolds can work at the same time. For different slab thicknesses, the upper manifold can be adjusted in height by the hydraulic cylinder at the same time. For slabs of different thicknesses, the nozzle angle will not change. In order to ensure the consistency of the nozzle angle, a connecting rod control is used to maintain parallelism. In order to ensure that the roller bearings are not sprayed by the jet water, these roller bearings are installed outside the box. Combined with Figure 2 and Figure 3 As shown, the descaling box roller table of the 5m thick plate rolling mill is driven by 14 three-phase AC variable frequency roller table motors 4 through universal joints 5 and gear boxes 6.

[0003] Combine Figure 4 However, in actual production, in order to improve the production rhythm of the rolling line, a steel plate is being rolled in the stand of the roughing mill 3 (see Figure 4 In the steel plate 1), before the roughing mill 3, that is, after the descaling box, place 1 to 2 slabs to be rolled (see Figure 4 In the example of slabs 1 and 2 in the roughing mill, once the current steel plate is rolled in the roughing mill 3, the next slab to be rolled can be quickly transported to the roughing mill 3 to start rolling. In order to prevent the high-temperature slab to be rolled from scalding the rollers during the waiting process, which may easily cause the roller bearings to swell and die, the rollers in front of the roughing mill 3, including the descaling rollers, need to be rotated forward and reversed so that the slab to be rolled can swing back and forth within a certain range. During the frequent forward and reverse rotation, the universal shaft of the descaling rollers wears faster and its service life is shortened. During the production process, if one of the rollers in the descaling area fails, it is very easy for the slab to get stuck in the high-pressure water descaling box 2, blocking the entire rolling line logistics and forcing the rolling line to stop. The slab stuck in the high-pressure water descaling box 2 must be returned to the furnace due to the long processing time and large temperature drop. Since it takes time to handle special safety procedures near the furnace area, the roller takeover repair process takes a long time, generally about 3 to 4 hours, causing huge cost losses to production. Summary of the Invention

[0004] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a control method for extending the service life of the roller universal joint, avoiding the occurrence of the defects of the prior art, increasing hourly production capacity, reducing energy consumption losses during abnormal shutdowns, and reducing equipment maintenance costs.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A control method for extending the service life of the roller universal shaft:

[0007] The rolling line PLC receives the descaling settings of the upper computer model, controls the movement of the descaling box and descaling roller according to the production information of the slab, collects the metal detector signal, sends the opening and closing signal of the spray system in the descaling box, and tracks and controls the position of the descaling slab to extend the service life of the roller universal joint.

[0008] Preferably, the control of the descaling box and the descaling roller comprises the following steps:

[0009] S1. Steel tapping from the heating furnace is completed and the heating furnace PLC issues a command;

[0010] S2, the rolling line host receives the steel tapping completion message and sends the slab thickness information;

[0011] S3, the main rolling line tracking PLC receives the telegram of slab thickness;

[0012] S4, the main descaling instrument detection interface PLC receives the slab thickness message and sends the descaling box adjustment action instruction;

[0013] S5, the trunk descaling instrument detection interface PLC determines whether the descaling box has moved to the target position. If so, it goes to step S6, if not, it continues to wait;

[0014] S6, descaling box action is completed.

[0015] Preferably, the tracking and controlling of the position of the descaled slab comprises the following steps:

[0016] S1. Steel tapping from the heating furnace is completed and the heating furnace PLC issues a command;

[0017] S2. After the heating furnace roller PLC receives the tapping completion message, the discharge roller starts to transport the slab forward;

[0018] S3, the main transmission control PLC receives the roller forward speed setting from the heating furnace roller PLC and sends it to the rolling line material tracking PLC;

[0019] S4. Determine whether the hot metal detector of the rolling line material tracking PLC detects the descaled slab. If so, enter step S5; if not, continue waiting;

[0020] S5, rolling line material tracking PLC tracks the position of descaled slab;

[0021] S6, the rolling line material tracking PLC determines whether the head position of the descaled slab reaches the selected position. If so, it goes to step S7; if not, it returns to step S5;

[0022] S7, the rolling line material tracking PLC starts the spraying system in the descaling box to descale the descaling slab;

[0023] S8. After the tail position of the descaled slab is greater than the selected position, the spray system is closed;

[0024] S9, the descaled slab is transported to the roughing mill;

[0025] S10, the rolling line coordination PLC determines whether there is a slab to be rolled in front of the roughing mill. If so, it goes to step S11; if not, it returns to step S9;

[0026] S11, the roller speed is set to zero, the roller stops rotating, and the slab to be rolled swings on the roller between the descaling box and the roughing mill;

[0027] S12, the rollers, descaling box and spray system in the descaling box area are in operation waiting for the next steel tapping completion instruction.

[0028] Preferably, in step S5, the target position is greater than 0.12 meters and less than 0.53 meters, and the target position window value is 0.14 meters.

[0029] Preferably, in step S5, the selected position reached by the head of the descaled slab is a distance that the head of the descaled slab exceeds the physical position where the hot metal detector is installed.

[0030] Preferably, the head of the descaled slab is 1.4 meters beyond the physical location where the hot metal detector is installed.

[0031] Preferably, in step S8, the tail position of the descaled slab is greater than the selected position, which is a distance that the tail of the descaled slab exceeds the physical installation position of the hot metal detector.

[0032] Preferably, the distance from the tail of the descaled slab beyond the physical location where the hot metal detector is installed is 6.2 meters.

[0033] The control method provided by this invention extends the service life of the roller table universal shaft, avoiding the drawbacks of existing technologies, increasing the hourly production capacity of the rolling line, reducing energy losses during abnormal downtime, significantly extending the service life of the roller table universal shaft, and reducing equipment maintenance costs. It can be applied to similar wide and thick plate descaling box control systems and has broad application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the on-site layout of the existing descaling box area;

[0035] Figure 2 This is a schematic diagram of the on-site arrangement of the descaling box and 14 descaling rollers;

[0036] Figure 3 This is a schematic diagram of a descaling variable frequency motor driving a universal shaft to drive a roller conveyor;

[0037] Figure 4 It is a schematic diagram of the distribution of components and slab tracking processes on site;

[0038] Figure 5 It is a schematic flow chart of the control method of the present invention;

[0039] Figure 6 It is a schematic diagram of the principle of the control method of the present invention. DETAILED DESCRIPTION

[0040] In order to better understand the above technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments.

[0041] Combine Figure 5 and Figure 6 As shown, the present invention provides a control method for extending the service life of the roller universal shaft. The rolling line PLC receives the descaling setting of the upper computer model, controls the action of the descaling box and the descaling roller according to the production information of the slab, collects the metal detector signal, sends the start and close signal of the spray system in the descaling box, and tracks and controls the position of the descaling slab to extend the service life of the roller universal shaft.

[0042] The above-mentioned control of the descaling box and the roller table includes the following steps:

[0043] S1. Steel tapping from the heating furnace is completed and the heating furnace PLC issues a command;

[0044] S2, the rolling line host receives the steel tapping completion message and sends the slab thickness information;

[0045] S3, the main rolling line tracking PLC receives the telegram of slab thickness;

[0046] S4, the main descaling instrument detection interface PLC receives the slab thickness message and sends the descaling box adjustment action instruction;

[0047] S5, the trunk descaling instrument detection interface PLC determines whether the descaling box has moved to the target position (greater than 0.12 meters and less than 0.53 meters, and the target position window value is 0.14 meters). If so, proceed to step S6, if not, continue waiting;

[0048] S6. The descaling box action is completed.

[0049] The tracking control of the descaled slab includes the following steps:

[0050] S1. Steel tapping from the heating furnace is completed and the heating furnace PLC issues a command;

[0051] S2. After the heating furnace roller PLC receives the tapping completion message, the discharge roller starts to transport the slab forward;

[0052] S3, the main transmission control PLC receives the roller forward speed setting from the heating furnace roller PLC and sends it to the rolling line material tracking PLC;

[0053] S4. Determine whether the hot metal detector of the rolling line material tracking PLC detects the descaled slab. If so, enter step S5; if not, continue waiting;

[0054] S5, rolling line material tracking PLC tracks the position of descaled slab;

[0055] S6. The rolling line material tracking PLC determines whether the head position of the descaled slab reaches 1.4 meters (the distance from the head of the descaled slab to the physical installation position of the hot metal detector). This position is the reference 0m for slab position tracking. If so, the process proceeds to step S7. If not, the process returns to step S5.

[0056] S7, the rolling line material tracking PLC starts the spraying system in the descaling box to descale the descaling slab;

[0057] S8. When the tail position of the descaled slab exceeds 6.2 meters (the distance from the tail of the descaled slab to the physical location of the hot metal detector), the spray system is shut down, and this position becomes the reference 0m for slab position tracking;

[0058] S9, the descaled slab is transported to the roughing mill;

[0059] S10, the rolling line coordination PLC determines whether there is a slab to be rolled in front of the roughing mill. If so, it goes to step S11; if not, it returns to step S9;

[0060] S11, the roller speed is set to zero, the roller stops rotating, and the slab to be rolled swings on the roller between the descaling box and the roughing mill;

[0061] S12, the rollers, descaling box and spray system in the descaling box area are in operation waiting for the next steel tapping completion instruction.

[0062] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A control method for extending the service life of a roller table universal shaft, characterized by: The rolling line PLC receives the descaling settings of the upper computer model, controls the movement of the descaling box and the descaling roller according to the production information of the slab, collects the metal detector signal, sends the opening and closing signal of the spray system in the descaling box, and tracks and controls the position of the descaling slab to extend the service life of the universal shaft of the roller. The control of the descaling box and the descaling roller comprises the following steps: S1. Steel tapping from the heating furnace is completed and the heating furnace PLC issues a command; S2, the rolling line host receives the steel tapping completion message and sends the slab thickness information; S3, the main rolling line tracking PLC receives the telegram of slab thickness; S4, the main descaling instrument detection interface PLC receives the slab thickness message and sends the descaling box adjustment action instruction; S5, the trunk descaling instrument detection interface PLC determines whether the descaling box has moved to the target position. If so, it goes to step S6, if not, it continues to wait; S6, descaling box action is completed, The tracking and controlling of the position of the descaled slab comprises the following steps: S1. Steel tapping from the heating furnace is completed and the heating furnace PLC issues a command; S2. After the heating furnace roller PLC receives the tapping completion message, the discharge roller starts to transport the slab forward; S3, the main transmission control PLC receives the roller forward speed setting from the heating furnace roller PLC and sends it to the rolling line material tracking PLC; S4. Determine whether the hot metal detector of the rolling line material tracking PLC detects the descaled slab. If so, enter step S5; if not, continue waiting; S5, rolling line material tracking PLC tracks the position of descaled slab; S6, the rolling line material tracking PLC determines whether the head position of the descaled slab reaches the selected position. If so, it goes to step S7; if not, it returns to step S5; S7, the rolling line material tracking PLC starts the spraying system in the descaling box to descale the descaling slab; S8. After the tail position of the descaled slab is greater than the selected position, the spray system is closed; S9, the descaled slab is transported to the roughing mill; S10, the rolling line coordination PLC determines whether there is a slab to be rolled in front of the roughing mill. If so, it goes to step S11; if not, it returns to step S9; S11, the roller speed is set to zero, the roller stops rotating, and the slab to be rolled swings on the roller between the descaling box and the roughing mill; S12, the rollers, descaling box and spray system in the descaling box area are in operation waiting for the next steel tapping completion instruction.

2. The control method for extending the service life of a roller table universal shaft according to claim 1, characterized in that: In step S5, the target position is greater than 0.12 meters and less than 0.53 meters, and the target position window value is 0.14 meters.

3. The control method for extending the service life of a roller table universal shaft according to claim 2, characterized in that: In step S6, the selected position reached by the head of the descaled slab is a distance that the head of the descaled slab exceeds the physical position where the hot metal detector is installed.

4. The control method for extending the service life of a roller table universal shaft according to claim 3, characterized in that: The head of the descaled slab is 1.4 meters beyond the physical location where the hot metal detector is installed.

5. The control method for extending the service life of a roller table universal joint according to claim 1, characterized in that: In step S8, the tail position of the descaled slab is greater than the selected position, which is the distance that the tail of the descaled slab exceeds the physical position where the hot metal detector is installed.

6. The control method for extending the service life of a roller table universal shaft according to claim 5, characterized in that: The tail of the descaled slab is 6.2 meters beyond the physical location where the hot metal detector is installed.

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