A safety early warning method, device, system, equipment and medium for an open mill

Abstract

Embodiments of the present application relate to a roll mill safety early warning method, device, system, equipment and medium, to improve the safety of the roll mill. The roll mill safety early warning method comprises: acquiring the output of the brake process encoder of the roll mill, wherein the encoder is located on the main shaft of the drive motor of the roll mill; determining the roll cylinder brake angle of the roll mill according to the output of the brake process encoder of the roll mill, wherein the roll cylinder brake angle is the angle through which the roll cylinder rotates during the brake process of the roll mill; determining whether the determined roll cylinder brake angle is greater than the preset safety brake angle; and if the determined roll cylinder brake angle is greater than the preset safety brake angle, performing brake safety early warning.

Description

Technical Field

[0001] This application relates to the field of safety design, and in particular to a method, device, system, equipment and medium for safety early warning of open mills. Background Technology

[0002] The open mill is one of the most commonly used pieces of equipment in the rubber industry, mainly used for the hot refining, mixing, and plasticizing of rubber compounds. During operation, the open mill's drive motor powers the rollers, and the material is placed between the two rollers and compressed. When the open mill brakes, the drive motor stops powering the rollers. Emergency braking of the open mill is crucial in the event of personal injury or equipment failure; braking capability is the most important indicator of the open mill's safety. Summary of the Invention

[0003] This application provides a method, apparatus, system, equipment, and medium for early warning of open mill safety, in order to improve the safety of open mills.

[0004] In a first aspect, embodiments of this application provide a safety early warning method for an open mill, comprising:

[0005] The output of the encoder during the braking process of the open mill is obtained, wherein the encoder is located on the main shaft of the drive motor of the open mill;

[0006] The roller braking angle of the open mill is determined based on the output of the encoder during the braking process of the open mill. The roller braking angle is the angle through which the roller rotates during the braking process of the open mill.

[0007] Determine whether the determined roller braking angle is greater than the preset safe braking angle;

[0008] If the determined roller braking angle is greater than the preset safe braking angle, a braking safety warning will be issued.

[0009] In one possible implementation, the encoder is an incremental encoder;

[0010] Obtain the output of the encoder during the refining machine braking process, including:

[0011] The first pulse from the encoder is acquired when the refining machine starts braking, and the second pulse from the encoder is acquired when the refining machine stops braking.

[0012] In one possible implementation, acquiring a first encoder pulse at the start of open mill braking and acquiring a second encoder pulse at the end of open mill braking includes:

[0013] The encoder's first pulse is recorded when the starting command of the refining machine is received, and the encoder's second pulse is recorded when the encoder's pulse stops increasing.

[0014] In one possible implementation, determining the roller braking angle of the open mill based on the output of the open mill braking process encoder includes:

[0015] Determine the pulse difference between the second pulse and the first pulse of the encoder;

[0016] The roller braking angle of the open mill is determined based on the determined pulse difference.

[0017] In one possible implementation, determining the roller braking angle of the open mill based on a determined pulse difference includes:

[0018] Based on the determined pulse difference, the number of braking revolutions of the drive motor of the open mill is determined, wherein the number of braking revolutions of the drive motor is the number of revolutions the drive motor makes during the braking process of the open mill.

[0019] The roller braking angle of the open mill is determined based on the number of braking revolutions of the drive motor.

[0020] In one possible implementation, determining the roller braking angle of the open mill based on a determined number of drive motor braking revolutions includes:

[0021] Based on the determined number of brake rotations of the drive motor, determine the number of brake rotations of the rollers of the open mill, where the number of brake rotations of the rollers is the number of rotations the rollers make during the braking process of the open mill.

[0022] The roller braking angle of the open mill is determined based on the determined number of roller braking revolutions.

[0023] Secondly, embodiments of this application provide a safety early warning device for an open mill, comprising:

[0024] The acquisition unit is used to acquire the output of the encoder of the open mill braking process, wherein the encoder is located on the main shaft of the drive motor of the open mill;

[0025] The determining unit is used to determine the roller braking angle of the open mill based on the output of the encoder of the open mill braking process, wherein the roller braking angle is the angle through which the roller rotates during the open mill braking process;

[0026] The judgment unit is used to determine whether the determined roller braking angle is greater than the preset safe braking angle;

[0027] The control unit is used to issue a braking safety warning if the determined roller braking angle is greater than the preset safe braking angle.

[0028] In one possible implementation, the encoder is an incremental encoder;

[0029] The acquisition unit is specifically used to acquire the first pulse of the encoder when the refining machine starts braking, and to acquire the second pulse of the encoder when the refining machine stops braking.

[0030] In one possible implementation, the acquisition unit is specifically configured to record the first pulse of the encoder when a starting command for the refining machine is received, and to record the second pulse of the encoder when the encoder pulse stops increasing.

[0031] In one possible implementation, the determining unit is specifically used to determine the pulse difference between the second pulse and the first pulse of the encoder; and to determine the roller braking angle of the open mill based on the determined pulse difference.

[0032] In one possible implementation, the determining unit is specifically configured to determine the number of braking revolutions of the drive motor of the open mill based on the determined pulse difference, wherein the number of braking revolutions of the drive motor is the number of revolutions the drive motor has made during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of braking revolutions of the drive motor.

[0033] In one possible implementation, the determining unit is specifically used to determine the number of roller brake rotations of the open mill based on the determined number of brake rotations of the drive motor, wherein the number of roller brake rotations is the number of rotations the rollers make during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of roller brake rotations.

[0034] Thirdly, embodiments of this application provide a safety early warning system for an open mill, including:

[0035] The encoder is located on the main shaft of the drive motor of the open mill;

[0036] The control equipment is used to acquire the output of the encoder of the open mill braking process; determine the roller braking angle of the open mill based on the output of the encoder of the open mill braking process, wherein the roller braking angle is the angle through which the roller of the open mill rotates during the braking process; determine whether the determined roller braking angle is greater than the preset safe braking angle; if the determined roller braking angle is greater than the preset safe braking angle, a braking safety warning is issued.

[0037] In one possible implementation, the encoder is an incremental encoder;

[0038] The control device is specifically used to acquire the first pulse of the encoder when the open mill brakes and to acquire the second pulse of the encoder when the open mill brakes.

[0039] In one possible implementation, the control device is specifically configured to record a first pulse from the encoder when a braking command for the open mill is received, and to record a second pulse from the encoder when the encoder pulse stops increasing.

[0040] In one possible implementation, the control device is specifically configured to determine the pulse difference between the second pulse and the first pulse of the encoder; and to determine the roller braking angle of the open mill based on the determined pulse difference.

[0041] In one possible implementation, the control device is specifically configured to determine the number of braking revolutions of the drive motor of the open mill based on a determined pulse difference, wherein the number of braking revolutions of the drive motor is the number of revolutions the drive motor makes during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of braking revolutions of the drive motor.

[0042] In one possible implementation, the control device is specifically configured to determine the number of roller braking revolutions of the open mill based on a determined number of braking revolutions of the drive motor, wherein the number of roller braking revolutions is the number of revolutions the rollers make during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of roller braking revolutions.

[0043] Fourthly, embodiments of this application provide a control device, including: at least one processor, at least one memory, and computer program instructions stored in the memory, which, when executed by the processor, implement the method provided in the first aspect of embodiments of this application.

[0044] Fifthly, embodiments of this application provide a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the method provided in the first aspect of embodiments of this application.

[0045] The open mill safety early warning method, device, system, equipment and medium provided in this application determine the roller braking angle of the open mill by the output of the encoder on the main shaft of the drive motor of the open mill. If the determined roller braking angle is greater than the preset safe braking angle, a braking safety early warning is issued. This can promptly detect the insufficient braking capability of the open mill, remind maintenance, effectively reduce production accident damage and improve the safety of the open mill.

[0046] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the open mill provided in the embodiments of this application;

[0048] Figure 2 A schematic flowchart illustrating the open mill safety early warning method provided in this application embodiment;

[0049] Figure 3 A detailed flowchart illustrating the open mill safety early warning method provided in this application embodiment;

[0050] Figure 4 This is a schematic diagram of the structure of the open mill safety early warning device provided in the embodiments of this application;

[0051] Figure 5 This is a schematic diagram of the structure of the open mill safety early warning system provided in the embodiments of this application;

[0052] Figure 6 This is a schematic diagram of the structure of a control device provided in an embodiment of this application. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are only some embodiments of the technical solutions of this application, and not all embodiments. Based on the embodiments recorded in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the technical solutions of this application.

[0054] In the prior art, the structure of an open mill is as follows: Figure 1 As shown, the drive motor 101 provides power to the roller 100 after the speed is reduced by the gearbox 102.

[0055] This application provides a method, device, system, equipment, and medium for safety early warning of an open mill. The roller braking angle of the open mill is determined by the output of an encoder located on the main shaft of the drive motor. The roller braking angle is the angle the rollers rotate during the braking process of the open mill, specifically the angle from the start to the end of braking. A smaller roller braking angle indicates stronger braking capability of the open mill, while a larger angle indicates weaker braking capability. Therefore, if the determined roller braking angle is greater than a preset safe braking angle, a braking safety early warning is issued, which can promptly detect insufficient braking capability of the open mill, remind maintenance, effectively reduce production accident damage, and improve the safety of the open mill.

[0056] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application. Furthermore, the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0057] like Figure 2The diagram shown is a flowchart of an implementation method for a safety early warning method for an open mill according to an embodiment of this application. The specific implementation process of this method is as follows: S201-S204:

[0058] S201, Obtain the output of the encoder on the main shaft of the drive motor of the open mill during the braking process of the open mill.

[0059] In this embodiment of the application, the encoder can be an incremental encoder.

[0060] When the open mill is in operation, the drive motor of the open mill provides power to the rollers, the main shaft of the drive motor rotates, and the encoder pulse increases. When the open mill brakes, the drive motor of the open mill stops providing power to the rollers, but the main shaft of the drive motor will still be driven by the rollers to continue rotating under the action of inertia, and the encoder pulse continues to increase. Until the open mill brakes, the rollers stop rotating, the main shaft of the drive motor stops rotating, and the encoder pulse stops increasing.

[0061] In actual implementation, the first pulse of the encoder can be obtained when the turning machine brakes. Specifically, the turning machine brakes start when the turning machine brake command is received. Therefore, the first pulse of the encoder, i.e., the initial pulse value, can be recorded when the turning machine brake command is received. The second pulse of the encoder can be obtained when the turning machine brakes end. Specifically, the turning machine brakes end when the encoder pulse stops increasing. Therefore, the second pulse of the encoder, i.e., the final pulse value, can be recorded when the encoder pulse stops increasing.

[0062] S202, determine the roller braking angle of the open mill based on the output of the encoder during the open mill braking process.

[0063] In actual implementation, the pulse difference between the second pulse and the first pulse of the encoder can be determined, that is, the pulse difference between the final pulse value and the initial pulse value can be determined; then, based on the determined pulse difference, the roller braking angle of the open mill can be determined.

[0064] Furthermore, when determining the roller braking angle of the open mill based on the determined pulse difference, the number of braking revolutions of the drive motor of the open mill can be determined first based on the determined pulse difference. The number of braking revolutions of the drive motor is the number of revolutions the drive motor makes during the braking process of the open mill, that is, the number of revolutions the drive motor makes from the start of the braking process to the end of the braking process. Then, the roller braking angle of the open mill can be determined based on the determined number of braking revolutions of the drive motor.

[0065] Furthermore, when determining the roller braking angle of the open mill based on the determined number of brake rotations of the drive motor, the roller braking rotations of the open mill can be determined first based on the determined number of brake rotations of the drive motor. The roller braking rotations are the number of rotations the rollers make during the open mill braking process, that is, the number of rotations the rollers make from the start of the open mill braking process to the end of the open mill braking process. Then, the roller braking angle of the open mill can be determined based on the determined number of roller braking rotations.

[0066] S203, determine whether the determined roller braking angle is greater than the preset safe braking angle.

[0067] In other words, in this embodiment of the application, the braking capacity of the open mill is quantified as the roller braking angle and compared with the preset safe braking angle. By determining the relationship between the determined roller braking angle and the preset safe braking angle, it is determined whether the braking capacity of the open mill meets the requirements for safe production.

[0068] S204 If the determined roller braking angle is greater than the preset safe braking angle, a braking safety warning will be issued.

[0069] At this point, the braking capacity of the open mill no longer meets the requirements for safe production and needs to be inspected and repaired.

[0070] Correspondingly, if the determined roller braking angle is not greater than the preset safe braking angle, it indicates that the braking capacity of the open mill meets the requirements for safe production, and no braking safety warning is issued.

[0071] A detailed flowchart of the open mill safety early warning method provided in this application embodiment is shown below. Figure 3 As shown, it includes the following steps:

[0072] S301 records the encoder's first pulse F1 when it receives the start command of the refining machine.

[0073] S302 records the second pulse F2 of the encoder when the encoder pulse stops increasing.

[0074] S303, determine the pulse difference F2-F1 between the second pulse and the first pulse of the encoder.

[0075] S304, based on the determined pulse difference F2-F1 and the encoder resolution PPR, determine the number of braking revolutions of the open mill's drive motor.

[0076] The encoder resolution PPR is the number of pulses output by the encoder in one revolution.

[0077] S305, based on the determined number of braking revolutions of the drive motor. And the reduction ratio i of the gearbox, determine the number of roller brake rotations of the open mill.

[0078] Wherein, the reduction ratio i of the gearbox is the ratio of the input shaft speed to the output shaft speed of the gearbox.

[0079] S306, based on the determined number of roller brake turns Determine the roller braking angle of the open mill for

[0080]

[0081] S307, Determine the determined roller braking angle Is it greater than the preset safe braking angle?

[0082] If the roller braking angle is determined Greater than the preset safe braking angle Proceed to step S308; if the determined roller braking angle... No greater than the preset safe braking angle This process is now complete.

[0083] S308, brake safety warning.

[0084] The open mill safety early warning method provided in this application quantifies the braking capacity of the open mill into roller braking angles, which can promptly warn of insufficient braking capacity of the open mill and improve the safety of the open mill. Furthermore, quantifying the braking capacity of the open mill into roller braking angles is more intuitive. In practical application scenarios, the roller braking angles can be displayed on the screen in real time, making it convenient for operators to confirm at any time. Moreover, the preset safe braking angles are applicable to all models of open mills and have a wide range of applications.

[0085] It should be noted that although the steps of the method of this application are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0086] Based on the same inventive concept, such as Figure 4 As shown in the figure, this application embodiment provides a safety early warning device for an open mill, including:

[0087] Acquisition unit 401 is used to acquire the output of the encoder of the open mill braking process, wherein the encoder is located on the main shaft of the drive motor of the open mill;

[0088] The determining unit 402 is used to determine the roller braking angle of the open mill based on the output of the encoder of the open mill braking process, wherein the roller braking angle is the angle through which the roller rotates during the open mill braking process;

[0089] The judgment unit 403 is used to determine whether the determined roller braking angle is greater than the preset safe braking angle;

[0090] The control unit 404 is used to issue a braking safety warning if the determined roller braking angle is greater than the preset safe braking angle; and not to issue a braking safety warning if the determined roller braking angle is not greater than the preset safe braking angle.

[0091] In some embodiments of this application, the encoder may specifically be an incremental encoder;

[0092] The acquisition unit 401 is specifically used to acquire the first pulse of the encoder when the refining machine starts braking, and to acquire the second pulse of the encoder when the refining machine stops braking.

[0093] In actual implementation, the acquisition unit 401 is specifically used to record the first pulse of the encoder when the start-up command of the refining machine is received, and to record the second pulse of the encoder when the encoder pulse stops increasing.

[0094] In actual implementation, the determining unit 402 is specifically used to determine the pulse difference between the second pulse and the first pulse of the encoder; based on the determined pulse difference, the roller braking angle of the open mill is determined.

[0095] Furthermore, the determining unit 402 is specifically used to determine the number of braking revolutions of the drive motor of the open mill based on the determined pulse difference, wherein the number of braking revolutions of the drive motor is the number of revolutions the drive motor has made during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of braking revolutions of the drive motor.

[0096] Furthermore, the determining unit 402 is specifically used to determine the number of roller brake rotations of the open mill based on the determined number of brake rotations of the drive motor, wherein the number of roller brake rotations is the number of rotations the rollers make during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of roller brake rotations.

[0097] The specific implementation of each of the above units can be found in the aforementioned method embodiments, and will not be repeated here.

[0098] It should be noted that the unit division of the above-described device is merely exemplary and not mandatory. In fact, according to the embodiments of this application, the features and functions of the above two or more units can be embodied in one unit. Conversely, the features and functions of the above-described one unit can be further divided and embodied by multiple units.

[0099] Based on the same inventive concept, such as Figure 5 As shown in the figure, this application provides a safety early warning system for an open mill, including:

[0100] Encoder 501 is located on the main shaft of the drive motor of the open mill;

[0101] Control device 502 is used to acquire the output of the encoder of the open mill braking process; determine the roller braking angle of the open mill based on the output of the encoder of the open mill braking process, wherein the roller braking angle is the angle through which the roller of the open mill rotates during the braking process; determine whether the determined roller braking angle is greater than the preset safety braking angle; if the determined roller braking angle is greater than the preset safety braking angle, a braking safety warning is issued; if the determined roller braking angle is not greater than the preset safety braking angle, no braking safety warning is issued.

[0102] In some embodiments of this application, encoder 501 may specifically be an incremental encoder;

[0103] The control device 502 is specifically used to acquire the first pulse of the encoder when the open mill brakes and to acquire the second pulse of the encoder when the open mill brakes.

[0104] In actual implementation, the control device 502 is specifically used to record the first pulse of the encoder when the start-up command of the refining machine is received, and to record the second pulse of the encoder when the encoder pulse stops increasing.

[0105] Furthermore, the control device 502 is specifically used to determine the pulse difference between the second pulse and the first pulse of the encoder; and to determine the roller braking angle of the open mill based on the determined pulse difference.

[0106] Furthermore, the control device 502 is specifically used to determine the number of braking revolutions of the drive motor of the open mill based on the determined pulse difference, wherein the number of braking revolutions of the drive motor is the number of revolutions the drive motor has made during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of braking revolutions of the drive motor.

[0107] Furthermore, the control device 502 is specifically used to determine the number of roller brake rotations of the open mill based on the determined number of brake rotations of the drive motor, wherein the number of roller brake rotations is the number of rotations the rollers make during the braking process of the open mill; and to determine the roller braking angle of the open mill based on the determined number of roller brake rotations.

[0108] The specific implementation of the control device 502 can be found in the aforementioned method embodiments, and will not be repeated here.

[0109] It should be noted that if the spindle of the open mill's drive motor is already equipped with an encoder, the system can be implemented using the existing encoder. If the spindle of the open mill's drive motor is not originally equipped with an encoder, an additional encoder can be installed to implement the system.

[0110] It should also be noted that open mills have two rollers, and typically two drive motors are installed in open mills to provide power to the two rollers respectively. In actual implementation, an encoder can be installed on the spindle of only one drive motor, and a braking safety warning can be issued if the braking angle of the corresponding roller is greater than the preset safe braking angle; alternatively, encoders can be installed on the spindles of both drive motors, and a braking safety warning can be issued if the braking angle of either roller is greater than the preset safe braking angle.

[0111] Based on the same inventive concept as the above-described method embodiments, this application also provides a control device. In this embodiment, the structure of the control device can be as follows: Figure 6 As shown, it includes at least one memory 601, at least one processor 602, and a transceiver 603.

[0112] Memory 601 is used to store computer program instructions executed by processor 602. Memory 601 can be volatile memory, such as random-access memory (RAM); memory 601 can also be non-volatile memory, such as read-only memory, flash memory, hard disk drive (HDD), or solid-state drive (SSD), but is not limited thereto. Memory 601 can be a combination of the above-mentioned memory types.

[0113] The processor 602 may include one or more central processing units (CPUs) or digital processing units, etc. The processor 602 is used to implement the aforementioned open mill safety warning method when it calls computer program instructions stored in the memory 601.

[0114] Transceiver 603 is used to communicate with other devices.

[0115] This application embodiment does not limit the specific connection medium between the memory 601, processor 602, and transceiver 603 described above. This application embodiment... Figure 6 The memory 601, processor 602 and transceiver 603 are connected via bus 604, which is only for illustrative purposes and is not intended to be limiting.

[0116] In some possible implementations, various aspects of the open mill safety warning method provided in this application can also be implemented in the form of a program product, which includes computer program instructions that implement the above-described open mill safety warning method when executed by a processor.

[0117] The program product may take the form of any combination of one or more computer-readable storage media. In the embodiments of this application, the computer-readable storage medium may be any tangible medium that contains or stores computer program instructions.

[0118] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0119] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A safety early warning method for an open mill, characterized in that, include: The output of the encoder during the braking process of the open mill is obtained, wherein the encoder is located on the main shaft of the drive motor of the open mill. Obtaining the output of the encoder during the braking process of the open mill includes: obtaining the first pulse of the encoder at the start of the braking of the open mill, and obtaining the second pulse of the encoder at the end of the braking of the open mill. Based on the output of the encoder during the opening mill braking process, the roller braking angle of the opening mill is determined. The roller braking angle is the angle through which the roller rotates during the opening mill braking process, that is, the angle through which the roller rotates from the start of the opening mill braking process to the end of the opening mill braking process. Determine whether the determined roller braking angle is greater than the preset safe braking angle; If the determined roller braking angle is greater than the preset safe braking angle, a braking safety warning will be issued. The braking safety warning is used to indicate that the braking capacity of the open mill does not meet the requirements for safe production.

2. The method according to claim 1, characterized in that, The encoder is an incremental encoder.

3. The method according to claim 2, characterized in that, Acquiring the first encoder pulse at the start of the turning process and the second encoder pulse at the end of the turning process, including: The encoder's first pulse is recorded when the starting command of the refining machine is received, and the encoder's second pulse is recorded when the encoder's pulse stops increasing.

4. The method according to claim 2 or 3, characterized in that, Based on the output of the encoder in the open mill braking process, the roller braking angle of the open mill is determined, including: Determine the pulse difference between the second pulse and the first pulse of the encoder; The roller braking angle of the open mill is determined based on the determined pulse difference.

5. The method according to claim 4, characterized in that, Based on the determined pulse difference, the roller braking angle of the open mill is determined, including: Based on the determined pulse difference, the number of braking revolutions of the drive motor of the open mill is determined, wherein the number of braking revolutions of the drive motor is the number of revolutions the drive motor makes during the braking process of the open mill. The roller braking angle of the open mill is determined based on the number of braking revolutions of the drive motor.

6. The method according to claim 5, characterized in that, Based on the determined number of braking revolutions of the drive motor, determine the roller braking angle of the open mill, including: Based on the determined number of brake rotations of the drive motor, determine the number of brake rotations of the rollers of the open mill, where the number of brake rotations of the rollers is the number of rotations the rollers make during the braking process of the open mill. The roller braking angle of the open mill is determined based on the determined number of roller braking revolutions.

7. A safety early warning device for an open mill, characterized in that, include: The acquisition unit is used to acquire the output of the encoder during the braking process of the open mill, wherein the encoder is located on the main shaft of the drive motor of the open mill. Acquiring the output of the encoder during the braking process of the open mill includes: acquiring the first pulse of the encoder when the open mill braking starts, and acquiring the second pulse of the encoder when the open mill braking ends. The determining unit is used to determine the roller braking angle of the open mill based on the output of the encoder of the open mill braking process. The roller braking angle is the angle through which the roller rotates during the open mill braking process, that is, the angle through which the roller rotates from the start of the open mill braking to the end of the open mill braking. The judgment unit is used to determine whether the determined roller braking angle is greater than the preset safe braking angle; The control unit is used to issue a braking safety warning if the determined roller braking angle is greater than the preset safe braking angle. The braking safety warning is used to indicate that the braking capacity of the open mill does not meet the requirements for safe production.

8. A safety early warning system for an open mill, characterized in that, include: The encoder is located on the main shaft of the drive motor of the open mill; The control device is used to acquire the output of the encoder during the braking process of the open mill, including acquiring the first pulse of the encoder at the start of the braking process and the second pulse of the encoder at the end of the braking process; based on the output of the encoder during the braking process, the device determines the roller braking angle of the open mill, wherein the roller braking angle is the angle rotated by the roller during the braking process, that is, the angle rotated by the roller from the start of the braking process to the end of the braking process; the device determines whether the determined roller braking angle is greater than the preset safety braking angle; if the determined roller braking angle is greater than the preset safety braking angle, a braking safety warning is issued, wherein the braking safety warning is used to indicate that the braking capacity of the open mill does not meet the safety production requirements.

9. A control device, characterized in that, include: At least one processor, at least one memory, and computer program instructions stored in the memory, which, when executed by the processor, implement the method as described in any one of claims 1-6.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by a processor, the method described in any one of claims 1-6 is implemented.

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