A protective cover device for a high-speed rolling mill unit and a control method thereof

Abstract

The present invention relates to the technical field of high-speed rolling mill units, and provides a protective cover device of a high-speed rolling mill unit and a control method thereof, wherein the protective cover device of the high-speed rolling mill unit comprises a shell, a high-speed rolling mill unit module is arranged inside the shell, an opening portion aligned with the high-speed rolling mill unit module is formed on the shell, a protective cover is hinged on the shell, the protective cover has an open state position and a closed state position, the protective cover is connected to a flip mechanism, the flip mechanism can drive the protective cover to switch back and forth between the open state position and the closed state position, and the shell is also provided with an open state locking mechanism and a closed state locking mechanism acting on the protective cover. The present invention can effectively prevent broken rods and wires from being ejected to the outside.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed rolling mill units, and in particular to a protective cover device for a high-speed rolling mill unit and a control method thereof. Background Art

[0002] The high-speed finishing mills and sizing mills in metallurgical bar and wire production lines operate at speeds ranging from tens to over a hundred meters per second. If a bar or wire breaks during rolling, the broken material can be ejected at extremely high speeds, causing incredible destructive power. Without appropriate protective measures, this can damage equipment in adjacent rolling mills at best, and even cause casualties at nearby operating points. Therefore, high-speed bar and wire rolling mills must be equipped with protective covers to prevent the broken material from being ejected. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a protective cover device for a high-speed rolling mill unit and a control method thereof, which can effectively prevent broken rods and wires from being ejected to the outside.

[0004] The present invention adopts the following technical solutions.

[0005] A protective cover device for a high-speed rolling mill unit includes a shell, a high-speed rolling mill unit module is provided inside the shell, so an opening portion aligned with the high-speed rolling mill unit module is formed on the shell, and a protective cover is hinged on the shell, and the protective cover has an open state position and a closed state position. When the protective cover is in the open state position, the opening portion is opened; when the protective cover is in the closed state position, the opening portion is closed. The protective cover is connected to a flip mechanism, and the flip mechanism can drive the protective cover to switch back and forth between the open state position and the closed state position. An open state locking mechanism and a closed state locking mechanism are provided on the shell, and the open state locking mechanism and the closed state locking mechanism both have a restricted state position and a released state position. When the protective cover is in the open state position and the open state locking mechanism is in the restricted state position, the protective cover is restricted by the open state locking mechanism and cannot be rotated in the direction of closing the opening portion; when the protective cover is in the closed state position and the closed state locking mechanism is in the restricted state position, the protective cover is restricted by the closed state locking mechanism and cannot be rotated in the direction of opening the opening portion.

[0006] Furthermore, the flipping mechanism includes a connecting rod and a first driving member connected to the connecting rod, and the connecting rod is hinged to the protective cover.

[0007] Furthermore, the first driving member includes a first cylinder, a first piston head is slidably connected to the interior of the first cylinder, a first piston rod is connected to the first piston head, the first piston rod is hinged to the connecting rod, and the first cylinder is connected to a proportional valve.

[0008] Furthermore, first position sensing switches are sequentially provided on the working path of the first driving member, at least one first position sensing switch is triggered when the protective cover moves in the direction of opening the opening portion and passes the open state position, at least one first position sensing switch is triggered when the protective cover is in the open state position, at least one first position sensing switch is triggered when the protective cover is in the closed state position, and at least one first position sensing switch is triggered when the protective cover moves in the direction of closing the opening portion and passes the closed state position.

[0009] Furthermore, the open state locking mechanism and the closed state locking mechanism both include a locking member and a second driving member. The protective cover is provided with a locking portion that is compatible with the locking member. The locking member is hinged to the shell, and the second driving member can drive the locking member to embed into or out of the motion trajectory of the locking member.

[0010] Furthermore, the locking piece and the locking portion are both L-shaped.

[0011] Furthermore, the second driving member includes a second cylinder, a second piston head is slidably connected to the interior of the second cylinder, a second piston rod is connected to the second piston head, and the second piston rod is slidably connected to the locking member.

[0012] Furthermore, a plurality of second position sensing switches are sequentially provided on the working path of the second driving member, at least one of the second position sensing switches is triggered when the locking member is embedded in the motion trajectory of the locking portion, and at least one of the second position sensing switches is triggered when the locking member is separated from the motion trajectory of the locking portion.

[0013] A method for controlling a protective cover device of a high-speed rolling mill unit is provided. The method is based on the protective cover device of the high-speed rolling mill unit described above, and the method comprises:

[0014] In the step of switching to an open state, the flipping mechanism drives the protective cover to rotate from the closed state to the open state at a speed V1;

[0015] In the step of switching to a closed state, the flipping mechanism drives the protective cover to rotate from the open state to the closed state at a speed V1.

[0016] Furthermore, before the step of converting to the open state, a closed state unlocking step is also included, and the closed state unlocking step includes:

[0017] S11, the flipping mechanism drives the protective cover to pass through the closed state position at a speed V2 in the direction of closing the opening;

[0018] S12, the closed state locking mechanism is switched to the released state position;

[0019] S13, the flipping mechanism drives the protective cover to reset to the closed state position at an acceleration a1.

[0020] Furthermore, after the step of converting the open state, an open state locking step is also included, and the open state locking step includes:

[0021] S14, the flipping mechanism drives the protective cover to pass through the open state position at an acceleration a2 in the direction of opening the opening portion;

[0022] S15, the open state locking mechanism is switched to the restricted state position;

[0023] S16. The flipping mechanism drives the protective cover to return to the open state at a speed of V3.

[0024] Furthermore, before the step of converting to the closed state, an open state unlocking step is also included, and the open state unlocking step includes:

[0025] S21, the flipping mechanism drives the protective cover to pass through the open state position at a speed of V3 in the direction of opening the opening portion;

[0026] S22, the open state locking mechanism is switched to the release state position;

[0027] S23, the flipping mechanism drives the protective cover to return to the open state position at an acceleration a2.

[0028] Furthermore, after the step of converting to the closed state, a closed state locking step is also included, and the closed state locking step includes:

[0029] S24, the flipping mechanism drives the protective cover to pass through the closed state position in the direction of opening the opening portion at an acceleration a1;

[0030] S25, the closed state locking mechanism is switched to the restricted state position;

[0031] S26, the flipping mechanism drives the protective cover to return to the closed state at a speed V2.

[0032] The beneficial effects of the present invention are:

[0033] The housing of the present invention is hingedly connected to a protective cover connected to a flip mechanism. The flip mechanism drives the protective cover to rotate, thereby opening and closing the opening. When the protective cover is in the closed position, the opening of the housing is closed, effectively preventing broken rods and wires from being released to the outside. Furthermore, the housing is provided with an open-state locking mechanism and a closed-state locking mechanism. The open-state locking mechanism restricts the movement of the protective cover in the open position, while the closed-state locking mechanism restricts the movement of the protective cover in the closed position, thereby effectively preventing the protective cover from being accidentally opened or closed due to its own gravity or under abnormal circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 This is a schematic structural diagram of the protective cover device of the high-speed rolling mill unit of this embodiment;

[0036] Figure 2 A speed-time curve diagram of the protective cover in this embodiment during the process of switching from a closed state to an open state;

[0037] Figure 3 FIG. 1 is a speed-time curve diagram of the protective cover during the process of switching from the open state to the closed state of the embodiment.

[0038] Description of reference numerals:

[0039] Shell 1,

[0040] High-speed rolling mill module 2,

[0041] Protective cover 3, locking portion 31,

[0042] Flipping mechanism 4, connecting rod 41, first driving member 42, first position sensing switch 43,

[0043] First cylinder 421, first piston head 422, first piston rod 423,

[0044] Open state locking mechanism 5a, closed state locking mechanism 5b,

[0045] Locking member 51, second driving member 52, second position sensing switch 53,

[0046] Second cylinder 521 , second piston head 522 , second piston rod 523 . DETAILED DESCRIPTION

[0047] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. In order to better illustrate this embodiment, certain components of the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the actual size of the product.

[0048] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0049] As shown in the accompanying drawings, a protective cover device for a high-speed rolling mill unit includes a shell 1. A high-speed rolling mill unit module 2 is provided inside the shell 1, so an opening aligned with the high-speed rolling mill unit module 2 is formed on the shell 1, and a protective cover 3 is hinged on the shell 1. In this embodiment, the protective cover 3 is hinged to the top of the shell 1, and the protective cover 3 has an open state position and a closed state position. When the protective cover 3 is in the open state position, the protective cover 3 is horizontally arranged and the opening portion is opened; when the protective cover 3 is in the closed state position, the protective cover 3 is vertically arranged and the opening portion is closed. The protective cover 3 is connected to a flip mechanism 4, which can drive the protective cover 3 to open and close. It switches back and forth between the closed state positions. An open state locking mechanism 5a is provided at the top of the shell 1, and a closed state locking mechanism 5b is provided at the bottom of the shell 1. Both the open state locking mechanism 5a and the closed state locking mechanism 5b have a restricted state position and a released state position. When the protective cover 3 is in the open state position and the open state locking mechanism 5a is in the restricted state position, the protective cover 3 is restricted by the open state locking mechanism 5a and cannot be rotated in the direction of closing the opening part; when the protective cover 3 is in the closed state position and the closed state locking mechanism 5b is in the restricted state position, the protective cover 3 is restricted by the closed state locking mechanism 5b and cannot be rotated in the direction of opening the opening part.

[0050] Preferably, the flip mechanism 4 includes a connecting rod 41 and a first driving member 42 connected to the connecting rod 41. The connecting rod 41 is hinged to the protective cover 3. The first driving member 42 includes a first cylinder 421. A first piston head 422 is slidably connected to the interior of the first cylinder 421. The first piston head 422 is connected to a first piston rod 423. The first piston rod 423 is hinged to the connecting rod 41. The first cylinder 421 is connected to a proportional valve (not shown in the drawings). In this embodiment, one end of the first piston rod 423 is fixedly connected to the first active head, and the other end of the first piston rod 423 is hinged to one end of the connecting rod 41. The other end of the connecting rod 41 is hinged to the protective cover 3.

[0051] Preferably, first position sensing switches 43 are sequentially provided on the working path of the first driving member 42. In this embodiment, one first position sensing switch 43 is triggered when the protective cover 3 moves in the direction of opening the opening portion and passes the open state position, and the first position sensing switch 43 is regarded as the open state unlocking position sensing switch; one first position sensing switch 43 is triggered when the protective cover 3 is in the open state position, and the first position sensing switch 43 is regarded as the open state position sensing switch; one first position sensing switch 43 is triggered when the protective cover 3 is in the closed state position, and the first position sensing switch 43 is regarded as the closed state position sensing switch; one first position sensing switch 43 is triggered when the protective cover 3 moves in the direction of closing and opening and passes the closed state position, and the first position sensing switch 43 is regarded as the closed state unlocking position sensing switch.

[0052] Preferably, both the open state locking mechanism 5a and the closed state locking mechanism 5b include a locking member 51 and a second driving member 52. A locking portion adapted to the locking member 51 is provided on the protective cover 3. The locking member 51 is hingedly connected to the housing 1. The second driving member 52 can drive the locking member 51 to engage in or disengage from the motion trajectory of the locking portion. In this embodiment, the locking member 51 of the open state locking mechanism 5a is considered the open state locking member, the locking portion adapted to the open state locking member is the open state locking portion, the open state locking portion is provided at one end where the protective cover 3 is hingedly connected to the housing 1, and the second driving member 52 of the open state locking member is considered the top driving member; the locking member 51 of the closed state locking mechanism 5b is considered the closed state locking member, the locking portion adapted to the closed state locking member is the closed state locking portion, the closed state locking portion is provided at the other end of the protective cover 3, and the second driving member 52 of the closed state locking member is considered the bottom driving member.

[0053] When the protective cover 3 is in the open state position, if the open state locking mechanism 5a is in the restricted state position, the open state locking piece is embedded in the movement trajectory of the open state locking portion, and the protective cover 3 cannot rotate in the direction of closing the opening portion; when the protective cover 3 is in the closed state position, if the closed state locking mechanism 5b is in the restricted state position, the closed state locking piece is embedded in the movement trajectory of the closed state locking portion, and the protective cover 3 cannot rotate in the direction of opening the opening portion.

[0054] In this embodiment, both the locking member 51 and the locking portion are L-shaped.

[0055] Preferably, the second driving member includes a second cylinder 521, a second piston head 522 being slidably connected to the interior of the second cylinder 521, a second piston rod 523 being connected to the second piston head 522, and the second piston rod 523 being slidably connected to the locking member 51. In this embodiment, one end of the second piston rod 523 is fixedly connected to the second piston head 522, and the other end of the second piston rod 523 is slidably connected to the locking member 51.

[0056] Preferably, a plurality of second position sensing switches 53 are sequentially provided on the working paths of the second driving members 52 of the open state locking mechanism 5a and the closed state locking mechanism 5b. In the open state locking mechanism 5a, one second position sensing switch 53 is triggered when the open state locking member is embedded in the motion trajectory of the open state locking part, and one second position sensing switch is triggered when the open state locking member is separated from the motion trajectory of the open state locking part; in the closed state locking mechanism 5b, one second position sensing switch 53 is triggered when the closed state locking member is embedded in the motion trajectory of the closed state locking part, and one second position sensing switch 53 is triggered when the closed state locking member is separated from the motion trajectory of the closed state locking part.

[0057] A method for controlling a protective cover device of a high-speed rolling mill unit is provided. The method is based on the protective cover device of the high-speed rolling mill unit described above, and the method comprises:

[0058] In the step of switching to the open state, the flip mechanism 4 drives the protective cover 3 to rotate from the closed state to the open state at a speed V1;

[0059] In the step of switching to the closed state, the flip mechanism 4 drives the protective cover 3 to rotate from the open state to the closed state at a speed V1.

[0060] Preferably, before the step of converting to the open state, a closed state unlocking step is further included, and the closed state unlocking step includes:

[0061] S11, the flipping mechanism 4 drives the protective cover 3 to pass through the closed state position at a speed V2 in the direction of closing the opening;

[0062] S12, the closed state locking mechanism 5b is switched to the released state position, that is, the bottom driving member drives the closed state locking member to separate from the motion track of the closed state locking portion;

[0063] S13 , the flipping mechanism 4 drives the protective cover 3 to reset to the closed state at an acceleration a1 .

[0064] Preferably, after the step of converting the open state, an open state locking step is further included, and the open state locking step includes:

[0065] S14, the flipping mechanism 4 drives the protective cover 3 to pass through the open state position along the direction of opening the opening portion at an acceleration a2;

[0066] S15, the open state locking mechanism 5a is switched to the restricted state position, that is, the top driving member drives the open state locking member to fit into the motion track of the open state locking portion;

[0067] S16, the flipping mechanism 4 drives the protective cover 3 to return to the open state position at a speed of V3, and the open state locking piece and the open state locking portion are tightly pressed against each other.

[0068] Preferably, before the step of converting to the closed state, an open state unlocking step is also included, and the open state unlocking step includes:

[0069] S21, the flip mechanism 4 drives the protective cover 3 to pass the open state position along the direction of opening the opening portion at a speed of V3;

[0070] S22, the open state locking mechanism 5a is switched to the release state position, that is, the top driving member drives the open state locking member to separate from the motion track of the open state locking portion;

[0071] S23 , the flipping mechanism 4 drives the protective cover 3 to return to the open state position at an acceleration a2 .

[0072] Preferably, after the step of converting to the closed state, a closed state locking step is further included, and the closed state locking step includes:

[0073] S24, the flipping mechanism 4 drives the protective cover 3 to pass through the closed state position in the direction of opening the opening portion at an acceleration a1;

[0074] S25, the closed state locking mechanism 5b is switched to the restricted state position, that is, the bottom driving member drives the closed state locking member to fit into the motion track of the closed state locking portion;

[0075] S26, the flipping mechanism 4 drives the protective cover 3 to return to the closed state at a speed V2, and the closed state locking piece and the closed state locking portion are tightly pressed against each other.

[0076] In general, the process of switching the protective cover 3 from the closed state to the open state in this embodiment is as follows:

[0077] First, the first driving member 42 drives the protective cover 3 through the connecting rod 41 at a speed V2 along the direction of closing the opening portion to cross the closed state position, so that the closed state unlocking position sensing switch is triggered. Then, the second driving member 52 of the closed state locking mechanism 5b drives the closed state locking member to break away from the motion trajectory of the closed state locking portion. Then, the first driving member 42 drives the protective cover 3 through the connecting rod 41 to rotate to the closed state position along the direction of opening the opening portion at an acceleration a1, and triggers the closed state position sensing switch. Then, the first driving member 42 drives the protective cover 3 through the connecting rod 41. It rotates to the open state position at a speed of V1 and triggers the open state position sensing switch. Then, the first driving member 42 drives the protective cover 3 through the connecting rod 41 to cross the open state position at an acceleration a2 along the direction of the opening part, so that the open state unlocking position sensing switch is triggered. Then, the second driving member 52 of the open state locking mechanism 5a drives the open state locking member to embed into the motion trajectory of the open state locking part. Finally, the first driving member 42 drives the protective cover 3 to rotate to the open state position at a speed of V3 through the connecting rod 41, and the open state locking member and the open state locking part are tightly pressed against each other.

[0078] The speed-time curve of the process of the protective cover 3 switching from the closed state to the open state is shown in the attached figure. Figure 2 shown.

[0079] In general, the process of switching the protective cover 3 from the open state to the closed state in this embodiment is as follows:

[0080] First, the first driving member 42 drives the protective cover 3 through the connecting rod 41 at a speed V3 along the direction of opening the opening portion to cross the open state position, so that the open state unlocking position sensing switch is triggered. Then, the second driving member 52 of the open state locking mechanism 5a drives the open state locking member to break away from the motion trajectory of the open state locking portion. Then, the first driving member 42 drives the protective cover 3 through the connecting rod 41 to rotate to the open state position along the direction of closing the opening portion at an acceleration a2, and triggers the open state position sensing switch. Then, the first driving member 42 drives the protective cover 3 through the connecting rod 41 to close the opening portion. It rotates to the closed state position at a speed of V1 and triggers the closed state position sensing switch. Then, the first driving member 42 drives the protective cover 3 through the connecting rod 41 to cross the closed state position with an acceleration a1 in the direction of closing the opening part, so that the closed state unlocking position sensing switch is triggered. Then, the second driving member 52 of the closed state locking mechanism 5b drives the closed state locking member to embed into the motion trajectory of the closed state locking. Finally, the first driving member 42 drives the protective cover 3 to rotate to the closed state position at a speed of V2 through the connecting rod 41, and the closed state locking member and the closed state locking part are tightly pressed against each other.

[0081] The speed-time curve of the process of the protective cover 3 switching from the open state to the closed state is shown in the attached figure. Figure 3 shown.

[0082] It is understood that, since both the locking member and the locking portion of this embodiment are L-shaped, in the closed-state unlocking step, the closed-state locking portion first rotates along the direction of the closing opening portion with the protective cover 3 by a certain angle, thereby reserving sufficient space for the closed-state locking member to disengage from the closed-state locking portion's motion trajectory. This helps avoid any jamming between the closed-state locking member and the closed-state locking portion. In the open-state locking step, the open-state locking portion first rotates along the direction of the opening opening portion with the protective cover 3 by a certain angle, thereby reserving sufficient space for the open-state locking member to engage with the open-state locking portion's motion trajectory. This helps avoid any jamming between the open-state locking member and the open-state locking portion. Similarly, in the open-state unlocking step, the open-state locking portion first rotates along the direction of the opening opening portion with the protective cover 3 by a certain angle, thereby avoiding any jamming between the open-state locking member and the open-state locking portion. In the closed-state locking step, the closed-state locking portion first rotates along the direction of the closing opening portion with the protective cover 3 by a certain angle, thereby avoiding any jamming between the closed-state locking member and the closed-state locking portion.

[0083] It should be noted that the open state locking mechanism 5a and the closed state locking mechanism 5b of this embodiment can automatically limit the movement of the protective cover 3 or automatically release the restriction on the movement of the protective cover 3 without the need for a separate manual latch, and the degree of automation is relatively high.

[0084] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the claims of the present invention.

Claims

1. A protective cover device for a high-speed rolling mill unit, comprising a housing, wherein a high-speed rolling mill unit module is arranged inside the housing, so that an opening portion aligned with the high-speed rolling mill unit module is formed on the housing, characterized in that: A protective cover is hinged on the housing, and the protective cover has an open state position and a closed state position. When the protective cover is in the open state position, the opening portion is opened; when the protective cover is in the closed state position, the opening portion is closed. The protective cover is connected to a flip mechanism, and the flip mechanism can drive the protective cover to switch back and forth between an open state position and a closed state position. The housing is provided with an open state locking mechanism and a closed state locking mechanism, and both the open state locking mechanism and the closed state locking mechanism have a restricted state position and a released state position. When the protective cover is in the open state position and the open state locking mechanism is in the restricted state position, the protective cover is restricted by the open state locking mechanism and cannot rotate in the direction of closing the opening portion; when the protective cover is in the closed state position and the closed state locking mechanism is in the restricted state position, the protective cover is restricted by the closed state locking mechanism and cannot rotate in the direction of opening the opening portion; The flip mechanism includes a connecting rod and a first driving member connected to the connecting rod, and the connecting rod is hinged to the protective cover; The first position sensing switches are sequentially arranged on the working path of the first driving member, at least one of the first position sensing switches is triggered when the protective cover moves in the direction of opening the opening portion and passes the open state position, at least one of the first position sensing switches is triggered when the protective cover is in the open state position, at least one of the first position sensing switches is triggered when the protective cover is in the closed state position, and at least one of the first position sensing switches is triggered when the protective cover moves in the direction of closing the opening portion and passes the closed state position; The open state locking mechanism and the closed state locking mechanism both include a locking piece and a second driving piece. The protective cover is provided with a locking portion that is compatible with the locking piece. The locking piece is hinged to the shell. The second driving piece can drive the locking piece to embed into or escape from the motion trajectory of the locking piece. The locking piece and the locking portion are both L-shaped.

2. A protective cover device for a high-speed rolling mill unit according to claim 1, characterized in that: The first driving member includes a first cylinder barrel, a first piston head is slidably connected to the interior of the first cylinder barrel, a first piston rod is connected to the first piston head, the first piston rod is hinged to a connecting rod, and the first cylinder barrel is connected to a proportional valve.

3. The protective cover device of a high-speed rolling mill unit according to claim 1, characterized in that: The second driving member includes a second cylinder barrel, a second piston head is slidably connected to the interior of the second cylinder barrel, a second piston rod is connected to the second piston head, and the second piston rod is slidably connected to the locking member.

4. The protective cover device for a high-speed rolling mill unit according to claim 1, characterized in that: A plurality of second position sensing switches are sequentially arranged on the working path of the second driving member, at least one of the second position sensing switches is triggered when the locking member is embedded in the motion trajectory of the locking portion, and at least one of the second position sensing switches is triggered when the locking member is separated from the motion trajectory of the locking portion.

5. A control method for a protective cover device of a high-speed rolling mill unit, characterized in that: The method is based on the protective cover device of the high-speed rolling mill unit according to any one of claims 1 to 4, and the method comprises: The step of switching to an open state, wherein the flipping mechanism drives the protective cover to rotate from a closed state to an open state at a speed V1; The step of switching to a closed state, wherein the flipping mechanism drives the protective cover to rotate from the open state to the closed state at a speed V1; Before the step of converting to the open state, a closed state unlocking step is also included, and the closed state unlocking step includes: S11, the flipping mechanism drives the protective cover to pass through the closed state position along the direction of closing the opening portion at a speed V2; S12, the closed state locking mechanism is switched to the released state position; S13, the flipping mechanism drives the protective cover to reset to the closed state position at an acceleration of a1; After the step of converting the open state, the method further includes a step of locking the open state, wherein the step of locking the open state includes: S14, the flipping mechanism drives the protective cover to pass through the open state position along the direction of opening the opening portion at an acceleration a2; S15, the open state locking mechanism is switched to the restricted state position; S16, the flipping mechanism drives the protective cover to return to the open state at a speed of V3.

6. The control method of the protective cover device of the high-speed rolling mill unit according to claim 5, characterized in that: Before the step of converting to the closed state, the step of unlocking the open state is also included, and the unlocking of the open state includes: S21, the flipping mechanism drives the protective cover to pass the open state position along the direction of opening the opening portion at a speed of V3; S22, the open state locking mechanism is switched to the released state position; S23, the flipping mechanism drives the protective cover to reset to the open state position at an acceleration of a2; After the step of converting the closed state, a closed state locking step is also included, and the closed state locking step includes: S24, the flipping mechanism drives the protective cover to pass through the closed state position along the direction of opening the opening portion at an acceleration a1; S25, the closed state locking mechanism is switched to the restricted state position; S26, the flipping mechanism drives the protective cover to return to the closed state at a speed V2.

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