A control method for improving the production efficiency of a rewinder

Abstract

The application discloses a control method for improving production efficiency of a rewinding machine, and calculates and sets the maximum acceleration time and minimum deceleration time of each set of paper of a parent roll, dynamically calculates the shortest acceleration and deceleration time of the second set of paper, automatically corrects the acceleration and deceleration time, and sequentially circulates until all the paper on the parent roll is completely withdrawn, so that the energy consumption of the rewinding machine is reduced, and the production efficiency of the rewinding machine is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the rewinding machine technical field, and particularly relates to a control method for improving production efficiency of a rewinding machine. BACKGROUND

[0002] The rewinding machine is the last process in the papermaking industry, and is the fastest mechanical equipment in the paper machine, and the speed can reach 3000 m / min. The raw paper from the paper machine must be rewound to be the finished product. The paper speed of the rewinding machine is generally 0-10 m / min. After the paper is introduced, the speed is increased and the tension is controlled to be constant to ensure the quality of the paper roll. The acceleration and deceleration time is generally 60-70 seconds to increase to the design speed of 2500 m / min. According to the size of the mother roll, 3-5 sets of finished paper can be rewound. In the prior art, the motor of the rewinding machine is designed to have a large motor, and a uniform moment of inertia is used to rewind the paper, which causes large energy consumption of the rewinding machine and low production efficiency of the equipment. Therefore, it is necessary to provide a control method for improving the production efficiency of the rewinding machine. SUMMARY

[0003] The present application aims at solving the above problems and provides a control method for improving the production efficiency of the rewinding machine.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme: the control method comprises:

[0005] Step 1: according to the maximum overload multiple of the motor, a matching frequency converter is selected to work;

[0006] Step 2: the PLC controller calculates the moment of inertia J according to the diameter of the mother paper, and then calculates the initial maximum acceleration time T1ACC and the minimum deceleration time T1DEC according to the moment of inertia J of the mother paper;

[0007] Step 3: when the mother paper finishes the first set of paper, the PLC controller calculates the moment of inertia J according to the remaining diameter of the current mother paper, and then calculates the maximum acceleration time T2ACC and the minimum deceleration time T2DEC of the next set of paper according to the moment of inertia J;

[0008] Step 4: when the mother paper finishes the second set of paper, the PLC controller calculates the moment of inertia J according to the remaining diameter of the current mother paper, and then calculates the maximum acceleration time T3ACC and the minimum deceleration time T3DEC of the next set of paper according to the moment of inertia J;

[0009] Step 5: according to the same calculation method, when the last set of paper of the mother paper is finished, the PLC controller optimizes and determines the final acceleration time and deceleration time of each link of the mother paper.

[0010] Further preferably, the rotational inertia J is calculated by the formula: J = J_R + π / 32 * P * W * (DNR^4 - DR^4).

[0011] Further preferably, in the formula, J_R is the inertia of the reel, P is the paper density, W is the paper width, DNR is the paper diameter, and DR is the reel diameter.

[0012] Further preferably, the maximum acceleration time TACC is calculated by the formula: TJ = DW * J / (T + TZ + TM), and the minimum deceleration time TDEC is calculated by the formula: TS = DW * J / (T - TZ - TM).

[0013] Further preferably, in the formula, DW is the angular velocity, TZ is the tension torque, TM is the friction torque, and T is the rated torque of the motor.

[0014] The present application has the following advantages: through the design of the present application, the maximum acceleration time and the minimum deceleration time of each set of paper from the parent roll are calculated and set, the shortest acceleration and deceleration time of the second set of paper can be dynamically calculated, the acceleration and deceleration time is automatically corrected, and the process is repeated until all the paper on the parent roll is rewound, thereby reducing the energy consumption of the rewinding machine and improving the production efficiency of the rewinding machine. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The flowchart of the present application is shown in the figure. DETAILED DESCRIPTION

[0016] The control method for improving the production efficiency of the rewinding machine will be further described in detail below in combination with the drawings.

[0017] Referring to the drawings Figure 1 The control method for improving the production efficiency of the rewinding machine in the embodiment is characterized in that the control method comprises the following steps.

[0018] First step: according to the maximum overload multiple of the motor, a matching frequency converter is selected to work.

[0019] Second step: the PLC controller calculates the rotational inertia J according to the diameter of the parent paper, which is a cylindrical shape formed by winding several layers, by the formula: J = J_R + π / 32 * P * W * (DNR^4 - DR^4), and then calculates the initial maximum acceleration time T1ACC and the minimum deceleration time T1DEC according to the rotational amount of the parent paper; the acceleration time is calculated by the formula: T1ACC = DW * J / (T + TZ + TM), and the deceleration time is calculated by the formula: T1DEC = DW * J / (T - TZ - TM).

[0020] Third step: when the mother paper finishes the first set of paper, the PLC controller calculates the moment of inertia J according to the remaining diameter of the current mother paper through the formula J = J_R + π / 32 × P × W × (DNR^4-DR^4), and calculates the maximum acceleration time T2ACC and the minimum deceleration time T2DEC of the next set of paper according to the moment of inertia J; the acceleration time calculation method is T2ACC=DW*J / (T+TZ+TM), and the deceleration time calculation method is T2DEC=DW*J / (T-TZ-TM).

[0021] Fourth step: when the mother paper finishes the second set of paper, the PLC controller calculates the moment of inertia J according to the remaining diameter of the current mother paper through the formula J = J_R + π / 32 × P × W × (DNR^4-DR^4), and calculates the maximum acceleration time T3ACC and the minimum deceleration time T3DEC of the next set of paper according to the moment of inertia J; the acceleration time calculation method is T3ACC=DW*J / (T+TZ+TM), and the deceleration time calculation method is T3DEC=DW*J / (T-TZ-TM).

[0022] Fifth step: according to the same calculation method, until the mother paper finishes the last set of paper, the PLC controller optimizes and determines the final acceleration time and deceleration time T1ACC, T1DEC, T2ACC, T2DEC,..., T5ACC, T5DEC of the mother paper in each link.

[0023] In the formula, J_R is the inertia of the reel, P is the paper density, W is the width of the paper, DNR is the diameter of the paper, DR is the diameter of the reel, and the calculation method of the moment of inertia J of the mother paper is J = J_R + π / 32 × P × W × (DNR^4-DR^4); in the formula, DW is the angular velocity, TZ is the tension torque, TM is the friction torque, T is the rated torque of the motor, the acceleration time calculation method is TACC=DW*J / (T+TZ+TM), and the deceleration time calculation method is TDEC=DW*J / (T-TZ-TM).

[0024] Control process, when a new mother roll is loaded on the paper return frame, if the control mode is set to automatic optimization production, the PLC program automatically sets T1ACC and T1DEC as the current acceleration time and deceleration time; when a set of paper is completed, a new moment of inertia J is calculated, T2ACC and T2DEC are set as the current acceleration time and deceleration time, and the next set of cycle is executed until the original paper is completed.

[0025] The protection scope of the application is not limited to the above embodiments and their transformations. The routine modifications and replacements made by the skilled person in the art based on the content of the embodiments all belong to the protection scope of the application.

Claims

1. A control method for improving the production efficiency of a rewinding machine, characterized in that: The control method includes: Step 1: Selecting a matching frequency converter based on the maximum overload multiple of the motor; Step 2: The PLC controller calculates the moment of inertia J based on the diameter of the mother paper, and then calculates the initial maximum acceleration time T1ACC and minimum deceleration time T1DEC based on the moment of inertia J of the mother paper. Step 3: After the first set of paper is output from the mother paper, the PLC controller calculates the moment of inertia J based on the remaining diameter of the current mother paper, and calculates the maximum acceleration time T2ACC and the minimum deceleration time T2DEC for the next set of paper based on the moment of inertia J. Step 4: After the mother paper finishes the second set of paper output, the PLC controller calculates the moment of inertia J based on the remaining diameter of the current mother paper, and calculates the maximum acceleration time T3ACC and minimum deceleration time T3DEC for the next set of paper based on the moment of inertia J. Step 5: Using the same calculation method as above, until the last set of mother paper is output, the PLC controller optimizes and determines the final acceleration and deceleration time of the mother paper retraction at each stage.

2. The control method for improving the production efficiency of a rewinding machine according to claim 1, characterized in that: The moment of inertia J is calculated using the following formula: J = J_R + π / 32 × P × W × (DNR^4 - DR^4), where J_R is the roll inertia, P is the paper density, W is the roll width, DNR is the roll diameter, and DR is the roll diameter.

3. The control method for improving the production efficiency of a rewinding machine according to claim 1, characterized in that: The maximum acceleration time TACC is calculated using the formula: TACC = DW * J / (T + TZ + TM); the minimum deceleration time TDEC is calculated using the formula: TDEC = DW * J / (T - TZ - TM); where DW is the angular velocity, TZ is the tension torque, TM is the friction torque, and T is the rated torque of the motor.

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