A method for controlling a steel coil transport device to prevent cold-rolled coil rollover

Abstract

The application discloses a kind of steel coil transport device control methods for preventing cold rolling roll-over, first, a virtual grating is set to each saddle on the steel coil transport device;According to the motion data of steel coil trolley and transport trolley, the data of winding machine core expansion and shrinkage and the center position data of each saddle, determine the take-off and put-on operation of a certain saddle, when the take-off of a certain saddle is put on, the virtual grating signal is set;When the take-off from a certain saddle is identified, the virtual grating signal is reset;Secondly, the physical grating signal for identifying whether there is a steel coil on each saddle is obtained;Finally, the virtual grating signal and the physical grating signal corresponding to each saddle are compared in real time during production process, when they are consistent, normal operation;When they are inconsistent, the action of the relevant trolley is locked and an alarm is given, which is confirmed and subsequently processed by the operator.The method of the application can effectively avoid the collision of steel coil caused by special steel coil or grating failure, reduce the safety risk, and improve the production safety and continuity.

Description

Technical Field

[0001] This invention belongs to the field of cold rolling technology, specifically relating to a control method for a steel coil transport device to prevent cold rolling coil overturning. Background Technology

[0002] In continuously operating cold rolling mills, after rolling or processing by related lines, the strip steel is typically re-coiled at the mill exit using a coiler. Once the coil reaches the required length or weight, it is sheared and slit, then transferred to weighing, bundling, and labeling processes via a coil transport device. The coil transport device mainly consists of a coil trolley, a transport trolley, and multiple saddles. The specific transfer process is as follows: the coil trolley unloads the coil from the coiler and places it on a saddle; then the transport trolley gradually places the coil to the corresponding saddle for subsequent processing steps.

[0003] In existing advanced production units, the motion control, weighing, bundling, and labeling of the coil trolley and transport trolley are all automated, reducing the labor intensity of operators and improving production efficiency. However, due to continuous production and the varying sizes of the coils, they need to be transported back and forth between different saddles via the coil trolley and transport trolley, often resulting in some saddles having coils while others do not. During transport, if the trolley pushes a coil towards a saddle that already has coils, it can easily cause the coil to collide or even overturn. To address this, existing technology typically installs physical gratings at appropriate locations on each saddle, using the presence or absence of a coil at the saddle to determine if the grating signal is blocked. In actual production, using physical grating detection to determine the presence of a coil at a saddle generally meets production requirements, but it can lead to inaccurate detection in the following two situations: (1) The grating sensor itself is normal, but the steel coil diameter is small or the width is narrow. The light signal is not blocked by the steel coil, but passes through the outside of the steel coil or the hollow part inside the steel coil, resulting in the grating detection signal being incorrect and unable to truly reflect whether there is a steel coil at the saddle.

[0004] (2) The saddle actually has a coil, but the grating itself is faulty and the fault state is uncertain. If the signal fed back to the control system by the faulty grating is the same as the light transmission state signal, the control system will mistakenly judge that the saddle has no coil, causing signal distortion in the control system. When the grating detection signal is incorrect or the signal in the control system is distorted, causing the information that the saddle has a coil to be inconsistent with the actual object, the steel coil is very likely to collide and overturn in the fully automatic production process that relies on automatic step control. Since the weight of the steel coil is usually several tons to about 30 tons, once it overturns, it may damage a lot of equipment; and if the end face is facing down after the steel coil is abnormally overturned and falls, it is difficult to fix with the sling or wire rope, and subsequent hoisting and handling is very difficult.

[0005] Therefore, it is evident that existing physical grating detection methods are insufficient to meet the requirements for accurate detection of the coiled state of the saddle in fully automated production. Summary of the Invention

[0006] The purpose of this invention is to provide a control method for a steel coil transport device to prevent cold-rolled coil overturning. This method can effectively avoid steel coil collisions caused by special steel coil specifications or grating failure leading to unidentifiable coils, thereby reducing safety risks and improving production safety and continuity.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: A method for controlling a steel coil transport device to prevent cold-rolled coil overturning, characterized by comprising the following steps: S1. A virtual grating is set for each saddle on the steel coil transport device; the unwinding and rewinding operation of a certain saddle is determined based on the motion data of the steel coil trolley and the transport trolley, the expansion and contraction data of the coiler core shaft, and the center position data of each saddle; when an unwinding operation is performed on a certain saddle, the virtual grating signal corresponding to that saddle is set; when it is detected that a coil is being unwound from a certain saddle, the virtual grating signal corresponding to that saddle is reset. S2. Acquire the physical grating signal used to identify whether there is a steel coil on each saddle; S3. During the production process, the virtual grating signal and physical grating signal corresponding to each saddle are compared in real time. When the two are consistent, the system operates normally; when the two are inconsistent, the movement of the relevant trolley is locked and an alarm is triggered, requiring confirmation and subsequent processing by the operator.

[0008] Furthermore, the motion data of the steel coil trolley and the transport trolley includes data from the steel coil trolley lateral encoder, the steel coil trolley lifting encoder, the transport trolley lateral encoder, and the limit sensor data for the lifting of the transport trolley.

[0009] Furthermore, the alarm is triggered by outputting an alarm on the operation screen and / or on-site terminal.

[0010] Furthermore, the operator confirms the information either manually on-site or via camera.

[0011] The beneficial effects of this invention are: The control method of this invention requires no additional hardware; it can promptly alarm and terminate the automatic operation of the relevant trolleys in case of abnormalities, resuming automatic production only after on-site confirmation and reset on the screen by the operator. This control method effectively avoids steel coil collisions caused by special specifications or grating failure, reducing safety risks, improving production safety and continuity, and creating good economic benefits. Attached Figure Description

[0012] Figure 1 This is a flowchart illustrating the control method of the present invention.

[0013] Figure 2This is a schematic diagram showing the distribution of the saddles and related trolleys in the steel coil transport device of the present invention.

[0014] Figure 3 This is another schematic diagram showing the distribution of the saddles and related trolleys in the steel coil transport device of the present invention.

[0015] In the diagram: 1 is the winding machine spindle; 2 is the steel coil to be unloaded; 3, 4, 5, 6, and 7 are saddles; 8 is the steel coil trolley, equipped with a horizontal movement position encoder and a height lifting encoder; 9 is the transport trolley, equipped with a horizontal movement position encoder and a maximum lifting position and a descent position limit sensor; 10, 11, 12, 13, and 14 are physical gratings. Detailed Implementation

[0016] To make the technical problems, technical solutions, and beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, the present invention provides a control method for a steel coil transport device to prevent cold-rolled coil overturning, which mainly includes the following steps.

[0018] 1. Set up a virtual grating for each saddle and define the conditions for setting and resetting the virtual grating signal.

[0019] The main approach involves adding a control program to the existing PLC of the unit's basic automation system. This program acquires data from the coil trolley's lateral encoder, coil trolley's lifting encoder, transport trolley's lateral encoder, transport trolley's lifting limit sensor, and the center position of each saddle. Using logic and data processing, the program accurately determines the movements of the coil trolley and transport trolley, generating a virtual grating signal within the program to indicate whether a coil is on the saddle. When a trolley performs a coil unwinding operation towards a saddle, the corresponding virtual grating signal is set, indicating that a coil is present at that saddle. When a coil is detected being retrieved from a saddle, the corresponding virtual grating signal is reset, indicating that no coil is present at that saddle.

[0020] 2. Acquire physical grating signals to identify whether there are steel coils on each saddle. The physical grating is an existing physical detection component in the existing unit. When there is a steel coil on the saddle, the acquired physical grating signal is a set signal; when there is no steel coil on the saddle, the acquired physical grating signal is a reset signal.

[0021] Third, the virtual grating signal in step one is compared with the physical grating signal in step two in real time. When the two are consistent, it is judged as normal; when the two are inconsistent, it is judged as abnormal, an alarm is automatically triggered, and the trolley related to the unwinding and unwinding of this saddle is locked, causing it to automatically pause. The trolley is then manually confirmed on-site or through a camera. After the alarm problem is resolved, the trolley can be restarted or switched to manual operation. This greatly reduces or eliminates the problem of roll collision, reduces the risk of roll over, and reduces the occurrence of equipment damage and production stoppage.

[0022] The following is combined with Figure 2 The process of the trolley taking up and unwinding the roll is explained.

[0023] Initially, there are no steel coils on saddles 3, 4, 5, 6, and 7. At this time, the physical grating signal and the virtual grating signal on each saddle are reset (representing no coil). For ease of explanation, saddles 3, 4, 5, 6, and 7 will be referred to as saddle 3, saddle 4, saddle 5, saddle 6, and saddle 7 in the following text.

[0024] During production, if it is necessary to transfer the steel coil from the coiler spindle 1 to the saddle 3, the transfer process is as follows: The steel coil trolley 8 moves to the coil-taking position below the coiler, and the steel coil tray of the trolley rises to support the steel coil; then the coiler spindle retracts, and the steel coil trolley moves towards saddle 3, leaving the coil-taking position. At this time, a "steel coil trolley with coil" condition signal is obtained, and the steel coil trolley continues to move to saddle 3. When the lifting encoder of the steel coil trolley descends to the bottom, the virtual grating of saddle 3 is set, meaning there is a steel coil on saddle 3. When the virtual grating of saddle 3 is in the set state, it is not allowed to unwind the coil onto the saddle.

[0025] To transfer the steel coil from saddle #3 to saddle #4, the process is as follows: The transport trolley 9 moves to saddle #3 and lifts the steel coil. Upon leaving the area of ​​saddle #3, the virtual grating of saddle #3 is reset (a reset signal indicates no coil). The transport trolley 9 continues to move to saddle #4. When the steel coil tray of the transport trolley 9 descends to the bottom, the virtual grating corresponding to saddle #4 is set, indicating that there is a steel coil on saddle #4. While the virtual grating of saddle #4 is set, no further coil loading onto saddle #4 is permitted.

[0026] The same operating method used to transfer the steel coil from saddle 3 to saddle 4 can be used to transfer the steel coil from saddle 4 to saddle 5, from saddle 5 to saddle 6, and from saddle 6 to saddle 7. The specific process will not be detailed here.

[0027] During production, if the virtual grating signal of any one of the saddles (saddles 3, 4, 5, 6, and 7) is inconsistent with the physical grating signal, an alarm will be output on the operation screen and / or the field terminal, and the relevant actions of the steel coil trolley 8 and / or the transport trolley 9 will be locked for manual intervention.

[0028] For example, if the virtual grating signal and the physical grating signal of saddle No. 3 are inconsistent, an alarm will be issued, and the operation of the steel coil trolley 8 unwinding the coil to saddle No. 3 and the operation of the transport trolley 9 retrieving the coil from saddle No. 3 will be suspended; manual intervention is required.

[0029] For example, if the virtual grating signal and the physical grating signal of saddle No. 5 are inconsistent, an alarm will be issued and the operation of transport trolley 9 to unwind or rewind at saddle No. 5 will be suspended; manual intervention is required.

[0030] in addition, Figure 2 The diagram illustrates one embodiment of the present invention. In practical applications, the number of saddles can be adjusted according to actual conditions, and can be reduced or increased. The control method of the present invention, in addition to... Figure 2 The direction of steel coil transportation (the running direction of transport trolley 9 is perpendicular to the running direction of steel coil trolley 8). For Figure 3 The control method is also applicable to the direction of steel coil transportation (the running direction of the transport trolley 9 is horizontal with the running direction of the steel coil trolley 8).

[0031] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A control method for a steel coil transport device to prevent cold-rolled coil overturning, characterized in that, Includes the following steps: S1. A virtual grating is set for each saddle on the steel coil transport device; the unwinding and rewinding operation of a certain saddle is determined based on the motion data of the steel coil trolley and the transport trolley, the expansion and contraction data of the coiler core shaft, and the center position data of each saddle; when an unwinding operation is performed on a certain saddle, the virtual grating signal corresponding to that saddle is set; when it is detected that a coil is being unwound from a certain saddle, the virtual grating signal corresponding to that saddle is reset. S2. Acquire the physical grating signal used to identify whether there is a steel coil on each saddle; S3. During the production process, the virtual grating signal and physical grating signal corresponding to each saddle are compared in real time. When the two are consistent, the system operates normally; when the two are inconsistent, the movement of the relevant trolley is locked and an alarm is triggered, requiring confirmation and subsequent processing by the operator.

2. The control method for the steel coil conveying device to prevent cold-rolled coil overturning according to claim 1, characterized in that, The motion data of the steel coil trolley and the transport trolley include data from the steel coil trolley lateral encoder, the steel coil trolley lifting encoder, the transport trolley lateral encoder, and the limit sensor data for the lifting of the transport trolley.

3. The control method for the steel coil conveying device to prevent cold-rolled coil overturning according to claim 1 or 2, characterized in that, The alarm is triggered by outputting an alarm on the operation screen and / or on-site terminal.

4. The control method for the steel coil conveying device to prevent cold-rolled coil overturning according to claim 1 or 2, characterized in that, The operator confirms the information either manually on-site or via camera.

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