A control method and device for protecting the process of transporting steel coils at the exit of a cold rolling mill

Abstract

The present invention discloses a control method and device for protecting the steel coil during transportation at the outlet of a cold rolling mill, including: judging whether the steel coil is cored by the feedback time of the photoelectric pair-switch signal, and performing core-pulling protection for the uncoiling of the uncoiler and coiler; controlling the height of the coil unloading trolley of the cold rolling mill, and judging the anti-falling of the coil on the uncoiler according to the height deviation of the coil unloading trolley. The steel coil transportation protection control method provided by the present invention judges the core-pulling situation of the steel coil through the time of the pair-switch signal and the deviation of the recorded height of the coil unloading trolley, so as to prevent the coil-turning accident caused by the core-pulling of the steel coil. It has low investment, few equipment modifications, improves the operation stability of the continuous rolling mill unit, reduces the occurrence of coil-turning accidents, and avoids the equipment damage caused by coil-turning and the economic losses brought by long-time shutdown.

Description

Technical Field

[0001] The present invention relates to the technical field of steel coil transportation, and particularly to a control method and device for protecting the process of transporting steel coils at the outlet of a cold rolling mill. Background Art

[0002] Currently, the acid rolling production process flow in a cold rolling strip plant is as follows: hot coil - loading and uncoiling - welding - pickling - circular shear - rolling - coiling - uncoiling - uncoiling - walking beam transportation. After the steel coil is rolled by the rolling mill, it needs to be transported to the walking beam and then transferred to the next process by a crane.

[0003] At present, after the steel coil of the acid rolling unit is rolled, it needs to be transported to the walking beam or transported to the walking beam after being inspected by the uncoiler. When the uncoiling trolley automatically uncoils the steel coil at the coiler and the uncoiler, the uncoiling trolley needs to move downward along the mandrel direction after the mandrel of the coiler and the uncoiler is reduced in diameter to transport the steel coil away from the coiler and the uncoiler. During the transportation process, when the inner ring of the steel coil gets stuck on the mandrel, the downward movement of the uncoiling trolley at this time will cause major equipment accidents such as the steel coil tipping over and falling; at the same time, during the process of transporting the steel coil to the mandrel of the uncoiler, due to different arrival heights, the steel coil will collide with the mandrel of the uncoiler, resulting in accidents such as the steel coil tipping over and falling, with a high equipment damage rate and increased costs. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a control method and device for protecting the process of transporting steel coils at the outlet of a cold rolling mill. To solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a control method for protecting the process of transporting steel coils at the outlet of a cold rolling mill, including:

[0008] Judging whether the steel coil is core - pulled by the feedback time of the photoelectric pair - shooting switch signal to protect the core - pulling of the steel coil during uncoiling of the uncoiler and the coiler;

[0009] Controlling the height of the uncoiling trolley of the cold rolling mill, and judging the anti - dropping of the coil loading on the uncoiler according to the height deviation of the uncoiling trolley.

[0010] As a preferred embodiment of the control method for protecting the steel coil during the export transportation process of the cold rolling mill of the present invention, it further includes:

[0011] When the uncoiler and coiler of the cold rolling mill unload the steel coil, if the unloading trolley shows a downward trend, it will cause a coil overturning accident. An optoelectronic opposed switch is arranged on one side of the mandrel at the coiling position at the mill outlet, and the optoelectronic opposed switch passes through the coil core on the steel coil removal route.

[0012] As a preferred embodiment of the control method for protecting the steel coil during the export transportation process of the cold rolling mill of the present invention, it includes, by judging the feedback time of the optoelectronic opposed switch signal, whether the steel coil is core-pulled:

[0013] The first feedback time judgment: When the steel coil is removed from the uncoiler mandrel, it will cover the light signal of the optoelectronic opposed switch. At this time, the opposed switch cannot receive the feedback information. If the uncoiler moves more than the width of the steel coil and no feedback information is received yet, it is judged that the steel coil has a core-pulling phenomenon at this time, and the machine automatically stops for manual confirmation;

[0014] The second feedback time judgment: When the steel coil is removed from the coiler mandrel, it will cover the light signal of the optoelectronic opposed switch. At this time, the opposed switch cannot receive the feedback information. If the coiler moves more than the width of the steel coil and no feedback information is received yet, it is judged that the steel coil has a core-pulling phenomenon at this time, and the machine automatically stops for manual confirmation.

[0015] As a preferred embodiment of the control method for protecting the steel coil during the export transportation process of the cold rolling mill of the present invention, it further includes:

[0016] When the coiler unloads the steel coil, the calculation formula for judging the core-pulling of the steel coil is expressed as:

[0017] T1>W÷V1

[0018] Wherein, T1 is the time when the opposed switch of the coiler does not sense the signal, W is the width of the finished strip steel, and V1 is the removal speed of the unloading trolley;

[0019] When the uncoiler unloads the steel coil, the calculation formula for judging the core-pulling of the steel coil is expressed as:

[0020] T2>W÷V2

[0021] Wherein, T2 is the time when the opposed switch of the uncoiler does not sense the signal; W is the width of the finished strip steel; V2 is the removal speed of the unloading trolley.

[0022] As a preferred embodiment of the control method for protecting the steel coil during the export transportation process of the cold rolling mill of the present invention, it includes controlling the height of the unloading trolley of the cold rolling mill and judging the anti-drop of the coil loading on the uncoiler according to the height deviation of the unloading trolley, including:

[0023] When the coil uncoiling trolley transports the steel coil to the uncoiler and conducts a surface inspection of the strip steel, the coil core of the steel coil needs to be aligned with the mandrel of the uncoiler and then moved onto the mandrel of the uncoiler.

[0024] If there is a deviation in the height of the steel coil during the process of transporting the steel coil to the mandrel of the uncoiler, the body of the steel coil will touch the mandrel of the uncoiler, resulting in an accident of the steel coil falling. Therefore, it is necessary to provide anti-falling protection during the process of transporting the steel coil to the mandrel of the uncoiler.

[0025] As a preferred solution of the control method for protecting the process of transporting steel coils at the exit of the cold rolling mill of the present invention, it further includes:

[0026] The calculation formula for anti-falling judgment during the loading of the uncoiler is expressed as:

[0027] │h - (H - Δh)│ < 5mm

[0028] Where h is the real-time height of the coil uncoiling trolley, H is the height of the coil uncoiling trolley when receiving the steel coil at the coiler, and Δh is the fixed height difference between the mandrel of the uncoiler and the mandrel of the coiler.

[0029] As a preferred solution of the control method for protecting the process of transporting steel coils at the exit of the cold rolling mill of the present invention, when the current height of the coil uncoiling trolley is within the range difference of the height, the steel coil can be normally transported onto the mandrel of the uncoiler and the next step can be continued; otherwise, the vehicle will stop automatically and wait for manual confirmation.

[0030] In a second aspect, an embodiment of the present invention provides a control device for protecting the process of transporting steel coils at the exit of a cold rolling mill, including:

[0031] An optoelectronic signal feedback module, which is used to judge whether the steel coil is cored by the feedback time of the optoelectronic opposed switch signal, and to protect the cored unloading of the steel coil by the uncoiler and the coiler.

[0032] A control module, which is used to control the height of the coil uncoiling trolley of the cold rolling mill and make an anti-falling judgment on the loading of the uncoiler according to the height deviation of the coil uncoiling trolley.

[0033] In a third aspect, an embodiment of the present invention provides a computing device, including:

[0034] A memory and a processor;

[0035] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the one or more programs are executed by the one or more processors, the one or more processors implement the control method for protecting the process of transporting steel coils at the exit of the cold rolling mill as described in any embodiment of the present invention.

[0036] Fourthly, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the control method for protecting the process of transporting steel coils at the outlet of a cold rolling mill.

[0037] Advantages of the present invention: The steel coil transportation protection control method provided by the present invention judges the core-pulling situation of the steel coil by the time of the photoelectric switch signal and the deviation of the recorded height of the coil unloading trolley, so as to prevent the coil overturning accident caused by core-pulling. It has low investment, few equipment modifications, improves the operation stability of the continuous rolling mill unit, reduces the occurrence of coil overturning accidents, and avoids equipment damage caused by coil overturning and economic losses caused by long-term shutdown. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0039] Figure 1 It is a schematic flow chart of a control method and device for protecting the process of transporting steel coils at the outlet of a cold rolling mill according to an embodiment of the present invention;

[0040] Figure 2 It is a schematic wiring diagram of a photoelectric pair of switches of a control method and device for protecting the process of transporting steel coils at the outlet of a cold rolling mill according to an embodiment of the present invention;

[0041] Figure 3 It is a diagram of the equipment installation position of a control method and device for protecting the process of transporting steel coils at the outlet of a cold rolling mill according to an embodiment of the present invention;

[0042] Figure 4 It is a sectional view of steel coil transportation of a control method and device for protecting the process of transporting steel coils at the outlet of a cold rolling mill according to an embodiment of the present invention. Detailed Embodiments

[0043] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways than those specifically described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0045] Secondly, as used herein, the term "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other.

[0046] The present invention will be described in detail in conjunction with the schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0047] Meanwhile, in the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper, lower, inner, and outer" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first, second, or third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0048] Unless otherwise clearly defined and limited in the present invention, the terms "installed, connected, and coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, and may also be indirectly connected through an intermediate medium, or may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Embodiment 1

[0050] Referring to Figure 1 , which is an embodiment of the present invention, this embodiment provides a control method for protecting the steel coil during the transportation at the outlet of a cold rolling mill, including:

[0051] S1: Judging whether the steel coil is cored by the feedback time of the photoelectric pair-switch signal, and performing the core protection for the uncoiling of the uncoiler and the recoiler.

[0052] Furthermore, it also includes:

[0053] When the uncoiler and coiler of a cold rolling mill unload the steel coil, if the uncoiling trolley shows a downward trend, it will cause a coil overturning accident. An optoelectronic opposed switch is set on one side of the mandrel at the coiling position at the mill exit, and the optoelectronic opposed switch passes through the coil core on the steel coil removal route.

[0054] Furthermore, it is judged whether the steel coil has its core pulled out through the feedback time of the optoelectronic opposed switch signal, including:

[0055] The first feedback time judgment: When the steel coil is removed from the mandrel of the uncoiler, it will cover the light signal of the optoelectronic opposed switch. At this time, the opposed switch cannot receive the feedback information. If the uncoiler moves more than the width of the steel coil and no feedback information is received yet, it is judged that the steel coil has its core pulled out at this time, and the machine automatically stops for manual confirmation;

[0056] The second feedback time judgment: When the steel coil is removed from the mandrel of the coiler, it will cover the light signal of the optoelectronic opposed switch. At this time, the opposed switch cannot receive the feedback information. If the coiler moves more than the width of the steel coil and no feedback information is received yet, it is judged that the steel coil has its core pulled out at this time, and the machine automatically stops for manual confirmation.

[0057] Specifically, it also includes:

[0058] When the coiler unloads the steel coil, the calculation formula for judging the core pulling of the steel coil is expressed as:

[0059] T1>W÷V1

[0060] Wherein, T1 is the time when the opposed switch of the coiler does not sense the signal, W is the width of the finished strip steel, and V1 is the moving speed of the uncoiling trolley;

[0061] When the uncoiler unloads the steel coil, the calculation formula for judging the core pulling of the steel coil is expressed as:

[0062] T2>W÷V2

[0063] Wherein, T2 is the time when the opposed switch of the uncoiler does not sense the signal; W is the width of the finished strip steel; V2 is the moving speed of the uncoiling trolley.

[0064] It should be noted that when the steel coil moves out and blocks the opposed switch, the timing starts. After the time when the opposed switch is blocked is greater than the theoretical calculation time of the steel coil width divided by the steel coil speed, the program will make a protection and automatically terminate the movement of the uncoiling trolley.

[0065] S2: Control the height of the uncoiling trolley of the cold rolling mill, and judge the anti-drop of the coil on the uncoiler according to the height deviation of the uncoiling trolley;

[0066] Furthermore, controlling the height of the uncoiling trolley of the cold rolling mill and judging the anti-drop of the coil on the uncoiler according to the height deviation of the uncoiling trolley includes:

[0067] When the coil uncoiling trolley transports the steel coil to the uncoiler and conducts a surface inspection of the strip steel, the coil uncoiling trolley needs to align the coil core of the steel coil with the mandrel of the uncoiler and move it onto the mandrel of the uncoiler;

[0068] If there is a deviation in the height of the steel coil during the process of transporting the steel coil to the mandrel of the uncoiler, the body of the steel coil will touch the mandrel of the uncoiler, causing a steel coil dropping accident. Therefore, it is necessary to provide anti-dropping protection during the process of transporting the steel coil to the mandrel of the uncoiler.

[0069] Specifically, it further includes:

[0070] The calculation formula for anti-dropping judgment during the process of loading the uncoiler is expressed as:

[0071] │h - (H - Δh)│<5mm

[0072] Wherein, h is the real-time height of the coil uncoiling trolley, H is the height of the coil uncoiling trolley when receiving the steel coil at the coiler, and Δh is the fixed height difference between the mandrel of the uncoiler and the mandrel of the coiler.

[0073] Furthermore: When the current height of the coil uncoiling trolley is within the height range difference, the steel coil can be normally transported to the mandrel of the uncoiler and the next step can be continued; otherwise, it will automatically stop and wait for manual confirmation.

[0074] The control device for protecting the process of transporting the steel coil at the exit of the cold rolling mill in this embodiment includes:

[0075] An optoelectronic signal feedback module, which is used to judge whether the steel coil is cored by the feedback time of the optoelectronic opposed switch signal, and conduct anti-coring protection for the steel coil unloaded by the uncoiler and the coiler;

[0076] A control module, which is used to control the height of the coil uncoiling trolley of the cold rolling mill and conduct anti-dropping judgment on the process of loading the uncoiler according to the height deviation of the coil uncoiling trolley.

[0077] This embodiment also provides a computing device, which is applicable to the situation of the control method for protecting the process of transporting the steel coil at the exit of the cold rolling mill, including:

[0078] A memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the control method for protecting the process of transporting the steel coil at the exit of the cold rolling mill as proposed in the above embodiment.

[0079] The computer device may be a terminal, which includes a processor, a memory, a communication interface, a display screen, and an input device connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner. The wireless manner can be achieved through WIFI, carrier network, NFC (Near Field Communication), or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, trackball, or touchpad provided on the housing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0080] This embodiment also provides a storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the control method for protecting the process of transporting steel coils at the exit of a cold rolling mill as proposed in the above embodiment.

[0081] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. Technical details not described in detail in this embodiment can be referred to in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0082] Embodiment 2

[0083] Refer to Figures 2 to 4 , which is an embodiment of the present invention. Taking the 1250mm continuous rolling mill of Liuzhou Iron and Steel Cold Rolling as an example, actual operations are carried out to verify the beneficial effects.

[0084] The working process of this example:

[0085] 1. After the steel coil 1000 with a width of 1250 mm and a diameter of 1817 mm is rolled, the lifting hydraulic cylinder 1100 of the coil unloading trolley 500 rises and tops against the steel coil. At this time, the height of the coil unloading trolley lifted is calculated to be 1284 mm by using the absolute value encoder 600 of the coil unloading trolley height and this height is recorded. Then, the coil unloading trolley 500 carries the steel coil 1000 and horizontally moves out of the mandrel 100 at the coiling position of the coiler. At this time, the horizontal moving speed of the trolley is 0.19 m / s. During the movement, the steel coil passes through the photoelectric switch 200 of the coiler. At this time, the photoelectric switch signal cannot be returned through the reflector 300 of the coiler. The protection time is obtained as 6.58 s by reading the width of the steel coil 1000 from the secondary system and the speed feedback from the speed increment encoder 400 of the coil unloading trolley. When the protection time is reached and the photoelectric switch 200 of the coiler still does not get the feedback signal, it is judged that the steel coil is cored at the mandrel 100 at the coiling position of the coiler, and the machine automatically stops and transfers to the operator for handling.

[0086] 2. When the coil unloading trolley 500 needs to transport the steel coil 1000 to the uncoiler mandrel 900, it is judged whether it can automatically continue to transport the coil by calculating the difference between the existing height and the calculated theoretical height of the coil unloading trolley 500. The fixed height difference between the mandrel 100 at the coiling position of the coiler and the uncoiler mandrel 900 is 310 mm. The recorded height of the coil unloading trolley 500 when receiving the steel coil at the mandrel 100 at the coiling position of the coiler is 1284 mm. At this time, it is judged whether the height of the coil unloading trolley is within the range of (1284 - 310) ± 5 mm to achieve the anti-drop protection of the steel coil when loading the uncoiler.

[0087] 3. When it is necessary to automatically unload the steel coil 1000 from the uncoiler mandrel 900, after the coil unloading trolley 500 receives the steel coil 1000, it horizontally moves out and leaves the uncoiler mandrel 900. At this time, the horizontal moving speed of the trolley is 0.05 m / s. During the movement, the steel coil passes through the photoelectric switch 700 of the uncoiler. At this time, the photoelectric switch signal cannot be returned through the reflector 800 of the uncoiler. The protection time is obtained as 25 s by reading the width of the steel coil and the speed feedback from the speed increment encoder 400 of the coil unloading trolley. When the protection time is reached and the photoelectric switch 7 of the coiler still does not get the feedback signal, it is judged that the steel coil is cored at the coiling mandrel 900, and the machine automatically stops and transfers to the operator for handling.

[0088] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A control method for protecting the steel coil during the export transportation process of a cold rolling mill, characterized in that, Including: Judging whether the steel coil is cored by the feedback time of the optoelectronic opposed switch signal, and performing the core extraction protection for the uncoiling machine and the recoiling machine to unload the steel coil; Judging whether the steel coil is cored by the feedback time of the optoelectronic opposed switch signal, including: The first feedback time judgment. When the steel coil moves out of the uncoiling mandrel, it will cover the light signal of the optoelectronic opposed switch. At this time, the opposed switch cannot receive the feedback information. If the uncoiling machine moves more than the width of the steel coil and no feedback information is received yet, it is judged that the steel coil has a core extraction phenomenon at this time, and the machine automatically stops to wait for manual confirmation; The second feedback time judgment. When the steel coil moves out of the recoiling mandrel, it will cover the light signal of the optoelectronic opposed switch. At this time, the opposed switch cannot receive the feedback information. If the recoiling machine moves more than the width of the steel coil and no feedback information is received yet, it is judged that the steel coil has a core extraction phenomenon at this time, and the machine automatically stops to wait for manual confirmation; Controlling the height of the uncoiling trolley of the cold rolling mill, and judging the anti-drop of the uncoiling of the uncoiling machine according to the height deviation of the uncoiling trolley, including: When the uncoiling trolley transports the steel coil to the uncoiling machine and conducts a surface inspection of the strip steel, the uncoiling trolley needs to align the core of the steel coil with the mandrel of the uncoiling machine and move into the mandrel of the uncoiling machine; If there is a height deviation of the steel coil during the process of transporting the steel coil to the mandrel of the uncoiling machine, the body of the steel coil will touch the mandrel of the uncoiling machine, causing a steel coil dropping accident. Therefore, anti-drop protection is required during the process of transporting the steel coil to the mandrel of the uncoiling machine; Also including: The calculation formula for judging the anti-drop of the uncoiling of the uncoiling machine is expressed as: │h - (H - Δh)│ < 5mm Wherein, h is the real-time height of the uncoiling trolley, H is the height of the uncoiling trolley when receiving the steel coil at the recoiling machine, and Δh is the fixed height difference between the mandrel of the uncoiling machine and the mandrel of the recoiling machine.

2. The control method for protecting the steel coil during the export transportation process of a cold rolling mill as described in claim 1, characterized in that, Also including: When the uncoiling machine and the recoiling machine of the cold rolling mill unload the steel coil, if the uncoiling trolley shows a downward trend, it will cause a coil overturning accident. An optoelectronic opposed switch is set on one side of the mandrel at the recoiling position at the exit of the rolling mill, and the optoelectronic opposed switch passes through the core of the steel coil on the steel coil moving-out route.

3. The control method for protecting the process of transporting steel coils at the exit of a cold rolling mill as described in claim 2, characterized in that, Also including: When the recoiling machine unloads the steel coil, the calculation formula for judging the core extraction of the steel coil is expressed as: ; Among them, is the time when the coiling machine opposed switch fails to sense the signal, W is the width of the finished strip steel, is the moving-out speed of the coil unloading trolley; When the uncoiling machine unloads the steel coil, the calculation formula for judging the core extraction of the steel coil is expressed as: ; Among them, is the time when the proximity switch of the decoiler fails to sense the signal; W is the width of the finished strip steel; is the moving-out speed of the coil car.

4. The control method for protecting the steel coil during the export transportation process of a cold rolling mill as described in claim 3, wherein: When the current height of the uncoiling trolley is within the height range difference, the steel coil can be normally transported to the mandrel of the uncoiling machine and the next step can be continued. Otherwise, the machine automatically stops to wait for manual confirmation.

5. A control device for protecting the process of transporting steel coils at the outlet of a cold rolling mill, which is applied to the method according to any one of claims 1-4, characterized in that, Including: An optoelectronic signal feedback module, which is used to judge whether the steel coil is cored by the feedback time of the optoelectronic opposed switch signal, and perform the core extraction protection for the uncoiling machine and the recoiling machine to unload the steel coil; A control module, which is used to control the height of the uncoiling trolley of the cold rolling mill and judge the anti-drop of the uncoiling of the uncoiling machine according to the height deviation of the uncoiling trolley.

6. A computing device, including: A memory and a processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the control method for protecting the process of transporting the steel coil at the exit of the cold rolling mill described in any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium stores computer-executable instructions that, when executed by a processor, implement the steps of the control method for protecting the process of transporting a steel coil at the outlet of a cold rolling mill according to any one of claims 1 to 4.

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