Rod brake control method and system

Abstract

The application discloses a kind of bar brake control method and system, the method includes the following steps: control tail clamp brake switch valve opening;The actual clamping air pressure value obtained by tail clamp brake is compared with clamping air pressure set value, and the opening of tail clamp brake proportional valve is adjusted according to the comparison result, until the actual clamping air pressure value of tail clamp brake reaches clamping air pressure set value;Control tail clamp brake clamps rolling piece but does not brake, including: sending speed set value Vset And torque set value Tset are sent to the transmission device of tail clamp brake, at this time, speed set value Vset =V+deltaV, V is rolling piece speed, torque set value Tset =Tset1;When cutting is completed, speed set value Vset Changes into V;When rolling piece continues to walk set distance, control tail clamp brake starts braking, including: speed set value Vset From V is reduced to Vfinal according to the acceleration of setting, and torque set value Tset is increased to Tset2.The method is stable after being put into operation, greatly reduces the accident of steel stacking, speeds up the rhythm of rolling, and the output is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of rolling mill processing technology, specifically relating to a bar braking control method and system. Background Technology

[0002] High-speed bar production capacity exceeds that of ordinary bar cutting, is more adaptable to the new national standards, has better rolling effect, and has advantages such as high speed, large output, good negative deviation control, and good surface quality in the production of small-specification rebar. In recent years, high-speed bar production lines have become the mainstream of newly built bar production lines in China.

[0003] Traditional bar mills typically operate at speeds of 18 m / s, stopping the rolled material through friction. However, high-speed bar mills operate at speeds of up to 48.5 m / s, making it impossible to stop the rolled material using friction alone. A tail brake is required to rapidly stop the rolled material from high speed, thus necessitating the use of a tail brake control system. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one defect in the prior art and to provide a rod braking control method and system.

[0005] The technical solution of this invention is implemented as follows: This invention discloses a rod braking control method, comprising the following steps:

[0006] Open the control valve for the tail brake;

[0007] The actual clamping air pressure value of the tail brake is compared with the clamping air pressure setting value. The opening of the proportional valve of the tail brake is adjusted according to the comparison result until the actual clamping air pressure value of the tail brake reaches the clamping air pressure setting value.

[0008] Controlling the tail brake to clamp without braking includes: sending a speed setting value Vset and a torque setting value Tset to the transmission device of the tail brake. At this time, the speed setting value Vset = V + deltaV, where V is the speed of the rolled piece, deltaV is the additional speed setting value of the transmission device of the tail brake, and the torque setting value Tset = Tset1.

[0009] Once the shearing is complete, the speed set value Vset of the transmission device sent to the tail brake will change to V;

[0010] Controlling the tail brake includes: reducing the speed setpoint Vset of the transmission device sent to the tail brake from V to a preset value V by a set acceleration. final The torque setting value Tset of the transmission device sent to the tail brake is increased from the preset value Tset1 to the preset value Tset2.

[0011] Furthermore, the opening of the proportional valve of the tail brake is adjusted according to the comparison results. Specifically, this includes adjusting the opening of the proportional valve of the tail brake using a PI controller based on the deviation between the actual clamping air pressure value and the clamping air pressure setting value of the tail brake.

[0012] Furthermore, after the tail brake clamps the rolled piece, the tail brake switch valve is closed.

[0013] Furthermore, Tset1 = Tnorm * factor 1, Tset2 = Tnorm * factor 2, factor 1 is less than factor 2, and Tnorm is the rated torque of the electric tail brake.

[0014] Furthermore, factor 1 is 0.2 to 0.4, and factor 2 is greater than 1.5.

[0015] Furthermore, a is the coefficient of friction of the bar in the hub of the tail brake, and S is the sliding distance of the bar in the hub of the tail brake.

[0016] Furthermore, after shearing is completed, wait for a set time for the workpiece to continue moving a set distance S2, and then control the tail brake to start braking.

[0017] The present invention also discloses a bar braking control system, including a PLC controller and a tail clamp brake, wherein the tail clamp brake is electrically connected to the PLC controller, and the PLC controller is used to execute the bar braking control method steps described above.

[0018] Furthermore, the bar braking control system of the present invention also includes a human-machine interface, which is electrically connected to the PLC controller.

[0019] The present invention also discloses an electronic device, comprising:

[0020] At least one processor; and

[0021] A memory communicatively connected to the at least one processor; wherein,

[0022] The memory stores one or more computer programs that can be executed by the at least one processor, and the one or more computer programs are executed by the at least one processor to enable the at least one processor to perform the bar braking control method as described above.

[0023] The present invention also discloses a computer-readable medium storing a computer program, wherein the program, when executed by a processor, implements the steps in the bar braking control method described above.

[0024] This invention has at least the following beneficial effects: Based on the speed and torque feedback from the tail brake transmission device, the size and actual pressure of the tail brake pneumatic proportional valve, and the state of the flying shear, the invention uses a PLC to calculate and control the speed and torque of the tail brake proportional valve and the tail brake motor. This invention adjusts the opening of the tail brake proportional valve through a PI controller, making the tail clamping force more stable. This invention achieves more precise braking through accurate motor speed and force control.

[0025] After its implementation, the method and system have been operating stably, greatly reducing steel pile-up accidents, accelerating the rolling pace, shortening the steel tapping interval, and significantly increasing output, fully meeting all process requirements. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A flowchart of a bar braking control method provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the process layout for a high-speed bar clamping brake provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of a bar braking control system provided in an embodiment of the present invention;

[0030] Figure 4 A schematic diagram after the rolled piece has traveled a set distance S2. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this invention, unless otherwise stated, "a plurality of" or "several" means two or more.

[0034] See Figure 1 This invention discloses a rod braking control method, comprising the following steps:

[0035] Pre-set relevant parameters, including V final Factor 1, Factor 2, and the clamping air pressure setting value of the tail brake;

[0036] Open the control valve for the tail brake;

[0037] The actual clamping air pressure value of the tail brake is obtained in real time. The actual clamping air pressure value of the tail brake is compared with the clamping air pressure setting value. The opening of the proportional valve of the tail brake is adjusted according to the comparison result until the actual clamping air pressure value of the tail brake reaches the clamping air pressure setting value.

[0038] Controlling the tail brake to clamp the workpiece without braking includes: sending a speed setting value Vset and a torque setting value Tset to the transmission device of the tail brake to control the speed and torque of the tail brake motor. At this time, the speed setting value Vset = V + deltaV, where V is the speed of the workpiece, deltaV is the additional speed setting value of the transmission device of the tail brake, and the torque setting value Tset = Tset1.

[0039] After shearing is completed, the speed set value Vset of the transmission device sent to the tail brake is changed to V; after the workpiece continues to travel the set distance S2, see... Figure 4 Controlling the tail brake to initiate braking includes: changing the speed setpoint Vset of the transmission device sent to the tail brake from V to a preset value V according to the ramp speed. final That is, decelerating to V with a certain acceleration a. finalThe torque setting value Tset of the transmission device sent to the tail brake is increased from the preset value Tset1 to the preset value Tset2.

[0040] S2 is set as needed; in some embodiments, S2 is 1 to 3 meters.

[0041] acceleration Where S1 is the distance from the flying shear to the cooling bed inlet, and S is the distance the bar (i.e. the rolled piece) slides freely on the rotating drum.

[0042] Furthermore, the opening of the proportional valve of the tail brake is adjusted based on the comparison results. Specifically, this includes adjusting the opening of the proportional valve of the tail brake using a PI controller based on the deviation e(t) between the actual clamping air pressure value and the set clamping air pressure value of the tail brake. The formula for calculating the opening of the proportional valve is as follows: Where Kp is the gain parameter, Ti is the integration parameter, and dt is the sampling time (typically 10ms).

[0043] Furthermore, after the tail brake clamps the rolled piece, the tail brake switch valve is closed. Further, Tset1 = Tnorm * factor 1, Tset2 = Tnorm * factor 2, where factor 1 is less than factor 2. Factor 1 is generally between 0.2 and 0.4, and factor 2 is generally above 1.5. Tnorm is the rated torque of the electric tail brake.

[0044] In some embodiments, factor 1 is 0.2 to 0.4, and factor 2 is 2.0 to 3.0.

[0045] Vfinal is set as needed; preferably, Vfinal is set to the final braking speed of the rolled piece. 'a' represents the coefficient of friction of the rolled piece in the hub of the tail brake, and 'S' represents the sliding distance of the rolled piece in the hub of the tail brake. In some embodiments, the final braking speed Vfinal controlled by the tail brake in this patent is 5-8 m / s, and then the rolled piece is allowed to slide slowly, where S is the sliding distance of the bar.

[0046] This invention also discloses a bar braking control system, including a controller and a tail brake, wherein the tail brake is electrically connected to the controller, and the controller is used to execute the bar braking control method steps described above. The controller is a PLC controller. The PLC controller of the bar braking control system can also be connected to the PLC controller of the rolling mill control system.

[0047] The tail brake includes the tail brake transmission device, proportional valve, pressure detection sensor, and switching valve.

[0048] See Figure 2 and Figure 3 In this embodiment, there are four tail brakes, namely tail brakes A1, A2, A3, and A4. If it is a double high bar, then in this embodiment there are eight tail brakes, namely tail brakes A1, A2, A3, A4, B1, B2, B3, and B4.

[0049] Furthermore, the bar braking control system of the present invention also includes a human-machine interface (HMI), which is electrically connected to the PLC controller.

[0050] The human-machine interface has a simulation function. In simulation mode, the tail brake can perform corresponding actions according to the status of the rolling line PLC, which is consistent with the actual steel rolling, thus enabling safer and more efficient production.

[0051] The PLC controller has a complete control program that covers various process requirements:

[0052] 1. When the simulation is canceled, the tail brake switch valves of all channels will be automatically energized and opened. The opening commands BBD_A1_CMD_OPEN, BBD_A2_CMD_OPEN, BBD_A3_CMD_OPEN, and BBD_A4_CMD_OPEN will be 1.

[0053] 2. The final braking speed v of the rolled piece final Typically, the settings are configured by the operator on the human-machine interface, based on the position of the bar stock at the stop point on the cooling bed. v final Generally, 5 to 8 m / s is taken, where a is the friction coefficient of steel in the rotating hub, and S is the sliding distance of steel in the rotating hub;

[0054] 3. The clamping air pressure setting values ​​for the tail brake (BBD_A1_PRESS_SET, BBD_A2_PRESS_SET, BBD_A3_PRESS_SET, BBD_A4_PRESS_SET) are generally set within 0.4 MPa. The PLC controller adjusts the actual pressure (BBD_A1_PRESS_ACT, BBD_A2_PRESS_ACT, BBD_A3_PRESS_ACT, BBD_A4_PRESS_SET) according to the actual pressure.

[0055] The pressure (PRESS_ACT, BBD_A4_PRESS_ACT) and the set pressure are used to adjust the opening of the proportional valve (BBD_A1_PRESS_OUT, BBD_A2_PRESS_OUT, BBD_A3_PRESS_OUT, BBD_A4_PRESS_OUT) via a PI controller. The actual valve opening value (BBD_A1_PRESS_PV, BBD_A2_PRESS_PV, BBD_A3_PRESS_PV, BBD_A4_PRESS_PV) is displayed on the human-machine interface. The algorithm is as follows:

[0056] e(t) A1 =BBD_A1_PRESS_SET-BBD_A1_PRESS_ACT;

[0057] e(t) A2 =BBD_A2_PRESS_SET-BBD_A2_PRESS_ACT;

[0058] e(t) A3 =BBD_A3_PRESS_SET-BBD_A3_PRESS_ACT;

[0059] e(t) A4 =BBD_A4_PRESS_SET-BBD_A4_PRESS_ACT;

[0060]

[0061] Where Kp is the gain parameter, Ti is the integration parameter, and dt is the sampling time (typically 10ms).

[0062] 4. When the tail brake is clamping but not braking, it uses a combination of speed control and torque limiting. The workpiece speed is V. The PLC controller of the tail brake sends a speed setpoint Vset = V + deltaV to its transmission device, while the torque setpoint Tset = Tnorm * factor 1. Factor 1 is generally 0.2 to 0.4 and can be set on the human-machine interface. When clamping, the valve closing command is 1, i.e., BBD_A1_CMD_CLOSE, BBD_A2_CMD_CLOSE, BBD_A3_CMD_CLOSE, and BBD_A4_CMD_CLOSE are all 1, de-energizing the switching valves.

[0063] 5. After shearing is completed, the speed setting value of the tail brake is Vset = V. After the rolling continues for a certain distance, generally 1 to 3 meters, the tail brake starts to brake. When braking, the speed setting value Vset changes from V to Vfinal according to the ramp speed. At this time, the torque setting value Tset = Tnorm * factor 2, where factor2 is generally 2.0 to 3.0 and can be set on the human-machine interface.

[0064] Based on the same inventive concept, the present invention also discloses an electronic device, comprising:

[0065] At least one processor; and

[0066] A memory communicatively connected to the at least one processor; wherein,

[0067] The memory stores one or more computer programs that can be executed by the at least one processor, and the one or more computer programs are executed by the at least one processor to enable the at least one processor to perform the bar braking control method as described above.

[0068] In some embodiments, the processor may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor is typically used to control the overall operation of the electronic device. In this embodiment, the processor is used to run program code stored in the memory or process data, such as program code for a bar braking control method.

[0069] Based on the same inventive concept, the present invention also discloses a computer-readable medium storing a computer program, wherein when the program is executed by a processor, it implements the steps in the bar braking control method as described above.

[0070] The memory includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the memory may be an internal storage unit of the electronic device, such as the hard disk or memory of the electronic device. In other embodiments, the memory may also be an external storage device of the electronic device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. Of course, the memory may include both internal storage units and external storage devices of the electronic device. In this embodiment, the memory is typically used to store operating methods and various application software installed on the electronic device, such as program code for a bar braking control method. Furthermore, the memory can also be used to temporarily store various types of data that have been output or will be output.

[0071] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0072] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0073] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0074] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for controlling the braking of a bar stock, characterized in that, Includes the following steps: Open the control valve for the tail brake; The actual clamping air pressure value of the tail brake is compared with the clamping air pressure setting value. The opening of the proportional valve of the tail brake is adjusted according to the comparison result until the actual clamping air pressure value of the tail brake reaches the clamping air pressure setting value. Controlling the tail brake to clamp without braking includes: sending a speed setting value Vset and a torque setting value Tset to the transmission device of the tail brake. At this time, the speed setting value Vset = V + deltaV, where V is the rolling speed, deltaV is the additional speed setting value of the transmission device of the tail brake, and the torque setting value Tset = Tset1. Once the shearing is complete, the speed set value Vset of the transmission device sent to the tail brake will change to V; Controlling the tail brake includes: reducing the speed setpoint Vset of the transmission device sent to the tail brake from V to a preset value V by a set acceleration. final The torque setting value Tset of the transmission device sent to the tail brake is increased from the preset value Tset1 to the preset value Tset2; Tset1 = Tnorm * factor1, Tset2 = Tnorm * factor2, factor1 is less than factor2, and Tnorm is the rated torque of the electric tail brake. , where a is the coefficient of friction of the bar in the hub of the tail brake, and S is the sliding distance of the bar in the hub of the tail brake.

2. The bar braking control method as described in claim 1, characterized in that: Adjusting the opening of the proportional valve of the tail brake based on the comparison results includes: adjusting the opening of the proportional valve of the tail brake using a PI controller based on the deviation between the actual clamping air pressure value and the clamping air pressure setting value of the tail brake.

3. The bar braking control method as described in claim 1, characterized in that: After the tail brake clamps the rolled piece, the tail brake switch valve is closed.

4. The bar braking control method as described in claim 1, characterized in that: Factor1 is 0.2~0.4, and factor2 is greater than 1.

5.

5. The bar braking control method as described in claim 1, characterized in that: After shearing is completed, wait for a set time for the workpiece to continue moving a set distance S2, and then control the tail brake to start braking.

6. A bar braking control system, characterized in that: It includes a controller and a tail brake, the tail brake being electrically connected to the controller, the controller being used to perform the steps of the bar braking control method as described in any one of claims 1-5.

7. The bar braking control system as described in claim 6, characterized in that: It also includes a human-machine interface, which is electrically connected to the controller.

8. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores one or more computer programs that can be executed by the at least one processor, the one or more of the computer programs being executed by the at least one processor to enable the at least one processor to perform the bar braking control method as described in any one of claims 1-5.

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