CN105856635B - A kind of tension control system and control method for corrugated paper production line - Google Patents

Abstract

The invention discloses a tension control system for a corrugated paper production line, which includes a single-chip microcomputer, a rotational speed sensor, a voltage sensor, an acquisition card, and a tension sensor; It is connected to the drum through the transmission; the speed sensor collects the speed of the servo motor, the voltage sensor collects the excitation voltage of the separately excited generator, the tension sensor collects the tension of the corrugated paper, the speed sensor and the voltage sensor transmit the collected data to the microcontroller through the acquisition card, and the tension sensor The collected data is transmitted to the single-chip microcomputer, and the single-chip microcomputer makes the excitation regulator adjust the current of the separately excited generator according to the above data, thereby controlling the magnetic resistance torque of the separately excited generator; the separately excited generator stores the electric energy in the electric energy accumulator. The invention also provides a tension control method of a corrugated paper production line. The invention can accurately control the tension of the corrugated paper production line and improve the production quality of the corrugated paper.

Description

Tension control system and control method for corrugated paper production line

technical field

The invention relates to the field of tension control, in particular to a tension control system and control method for a corrugated paper production line.

Background technique

The process flow of corrugated cardboard production is: first put the rolls of corrugated paper on the corrugated paper racks, and the motor drives the rolls of corrugated paper to unfold. In the process of corrugated cardboard processing, the tension of corrugated paper conveyed on the equipment directly affects the processing quality of corrugated cardboard. If the force of corrugated paper exceeds the allowable range, it is easy to break the paper, affecting production efficiency and product quality. When the tension is unstable, the corrugated paper will have problems such as deviation, wrinkling and paper breakage, which will affect the production efficiency and cost, and affect the quality of corrugated board.

The existing tension control method usually adopts constantly changing the motor speed and torque to achieve tension control. This method has a low degree of automation, poor paper quality, and it is easy to cause deviation and drift of corrugated paper, which leads to a high production waste rate. This way makes the motor change speed frequently, so the impact on the internal circuit and external mechanical structure of the whole device is increased, thus reducing the service life of the whole device and increasing the production cost. Because the motor is constantly changing the speed and torque, the energy consumption is high.

Contents of the invention

The object of the present invention is to provide a tension control system and control method for a corrugated paper production line. The control system and control method can accurately control the tension of the corrugated paper production line and improve the production quality of the corrugated paper.

The technical solution adopted in the present invention is: a tension control system for a corrugated paper production line, including a single-chip microcomputer, an excitation regulator, a separate excitation generator, a transmission, a roller, a servo motor, a speed sensor, a voltage sensor, an acquisition card, and a tension sensor The single-chip microcomputer is connected with the separately excited generator through the excitation regulator, and the armature part of the separately excited generator is connected with the drum through the transmission; the speed sensor collects the speed of the servo motor, and the voltage sensor collects the separately excited generator The excitation voltage of the corrugated paper is collected by the tension sensor, the speed sensor and the voltage sensor transmit the collected data to the single-chip microcomputer through the acquisition card, and the tension sensor transmits the collected data to the single-chip microcomputer, and the single-chip microcomputer collects the data according to the tension sensor and the speed sensor. The data enables the excitation regulator to adjust the current of the separately-excited generator, thereby controlling the separately-excited generator; the voltage sensor feeds back the collected data to the single-chip microcomputer;

The separately excited generator stores electric energy in the electric energy accumulator;

The excitation regulator is connected with a DC power supply.

A further solution is that the tension sensor is placed on the roll.

A further solution is that the single-chip microcomputer is connected with the excitation regulator through a photoelectric isolation I/O card.

A further solution is that the electric energy accumulator is connected with the servo motor.

The servo motor provides a constant traction force F to drag the corrugated paper. In order to ensure that the paper remains flat during the production process, the corrugated paper needs to maintain a constant speed V ₀ movement. Since the corrugated paper is continuously retracted at the servo motor end, and the corrugated paper is continuously displayed at the drum end, in order to keep the tension and movement speed of the corrugated paper constant, the rotational speed of the servo motor end gradually decreases while the torque gradually increases; the rotational speed of the drum end gradually increases, providing a resistance torque Gradually reduce.

The present invention realizes the constant tension and movement speed of the corrugated paper by adjusting the rotational speed of the drum, and the specific steps are as follows:

1) The servo motor provides the driving force to drive the drum to rotate to pull out the corrugated paper, and connects with the separately excited generator through the transmission, and transmits the motion to the separately excited generator, so that the separately excited generator generates electricity, and at the same time, the electric energy generated by the separately excited generator Stored in the electric energy accumulator; the speed sensor collects the speed of the servo motor, and the tension sensor collects the tension of the corrugated paper; the speed sensor and the tension sensor transmit the collected data to the single-chip microcomputer;

2) As the radius of the corrugated paper on the drum decreases, the rotational speed of the drum will increase. The sensor will send the measured servo motor speed and paper tension signal to the single-chip microcomputer. The single-chip microcomputer calculates according to the above data and controls the excitation regulator to adjust the separately excited generator. Generate suitable exciting current of separately excited generator, make separately excited generator produce required separately excited generator magnetic resistance torque, and then control the rotation speed of the drum, keep the line speed of the drum constant, and thus control the tension of the corrugated paper;

3) The single-chip microcomputer monitors the excitation voltage of the separately excited generator, and adjusts the excitation current to accurately control the tension of the corrugated paper.

The beneficial effects produced by the present invention are:

(1) Sensor speed measurement combined with generator magnetic resistance torque to control the speed difference between the roller and the motor, so as to achieve stable and accurate tension control;

(2) The control method of controlling the tension of the corrugated paper by controlling the rotational speed of the drum is changed from the traditional control method of controlling the force of the corrugated paper by controlling the rotational speed of the servo motor, so as to accurately control the tension of the corrugated paper production line and improve the production quality of corrugated paper;

(3) Using a separate excitation generator to convert the kinetic energy of the drum into electrical energy, and store the electrical energy for reuse;

(4) The control system is simple in structure, easy to use, and easy to popularize and quote;

(5) The control system and control method make the tension control of corrugated paper more precise and intelligent, which ensures production efficiency and production quality, reduces energy consumption, and improves the service life of equipment;

(6) The whole system adopts a closed-loop control system of feedback control, which can effectively reduce the influence caused by various disturbance inputs and changes in internal parameters (such as drum speed), automatically correct deviations, and improve control accuracy.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the structural representation of the tension control system that the present invention is used in corrugated paper production line;

Figure 2 is a schematic diagram of corrugated paper force control.

Among them: 1. Corrugated paper, 2. Servo motor, 3. Roller, 4. Transmission, 5. Separately excited generator, 6. Single-chip microcomputer, 7. Excitation regulator, 8. Speed sensor, 9. Tension sensor, 10. Voltage sensor , 11. DC power supply, 12. Electric energy storage device, 13. Acquisition card, 14. Photoelectric isolation I/O card, 15. Roller.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to Fig. 2, the servo motor 2 provides a constant traction force F to drag the corrugated paper. In order to ensure that the paper of the corrugated paper 1 remains flat during the production process, the corrugated paper 1 needs to keep moving at a constant speed V ₀ . Since the servo motor 2 keeps taking up the corrugated paper 1, the roller 3 keeps displaying the corrugated paper 1. In order to keep the tension and movement speed of the corrugated paper 1 constant, the rotation speed of the servo motor 2 decreases gradually, and the torque increases gradually (the radius of gyration gradually increases); 3. The rotating speed gradually increases, and the resistance torque provided gradually decreases (the radius of gyration gradually decreases). According to the above principles, the present invention provides a tension control system and control method for a corrugated paper production line.

Referring to Fig. 1, a tension control system for a corrugated paper production line includes a single-chip microcomputer 10, an excitation regulator 7, an externally excited generator 5, a transmission 4, a drum 3, a servo motor 2, a rotational speed sensor 8, a voltage sensor 10, and an acquisition card 13. Tension sensor 9; single-chip microcomputer 6 is connected with separately excited generator 5 through excitation regulator 7, and the armature part of separately excited generator 5 is connected with drum 3 through transmission 4; speed sensor 8 collects the speed of servo motor 2, and voltage sensor 10 collects the excitation voltage of the separately excited generator 5, the tension sensor 9 collects the tension of the corrugated paper 1, the rotational speed sensor 8 and the voltage sensor 10 transmit the collected data to the single-chip microcomputer 6 through the collection card 13, and the tension sensor 9 transmits the collected data to the single-chip microcomputer 6. The single-chip microcomputer 6 makes the excitation regulator 7 adjust the current of the separately excited generator 5 according to the data collected by the tension sensor 9 and the rotational speed sensor 8, thereby controlling the magnetic resistance torque of the separately excited generator 5; the voltage sensor 10 feeds back the collected data Give MCU 6;

The separately excited generator 5 stores electric energy in the electric energy accumulator 12 ; the excitation regulator 7 is connected with the DC power supply 11 .

In order to accurately measure the tension of the corrugated paper, the tension sensor 9 is placed on the roller 15 . The single chip microcomputer 6 is connected with the excitation regulator 7 through the photoelectric isolation I/O card 14 . In order to save energy, the electrical energy accumulator 12 is connected to the servo motor 2 .

In the present invention, when the excitation current increases, the magnetic resistance torque of the separately excited generator 5 increases, the load of the servo motor 2 increases, and the rotation speed of the drum 3 slows down, so that the tension of the corrugated paper 1 becomes larger; on the contrary, when the excitation current decreases , the magnetic resistance torque of the separately excited generator 5 decreases, the load of the servo motor 2 decreases, and the rotation speed of the drum 3 becomes faster, so that the tension of the corrugated paper 1 becomes smaller.

The present invention also provides a method for tension control using the tension control system for a corrugated paper production line, comprising the following steps:

1) The servo motor 2 provides the driving force to drive the drum 3 to rotate to pull out the corrugated paper 1, and connects with the separately excited generator 5 through the transmission 4, and transmits the motion to the separately excited generator 5, so that the separately excited generator 5 generates electricity, and at the same time, the The electric energy generated by the separately excited generator 5 is stored in the electric energy accumulator 12; the rotational speed sensor 8 collects the rotational speed of the servo motor 2, and the tension sensor 9 collects the tension of the corrugated paper 1; the rotational speed sensor 8 and the tension sensor 9 transmit the collected data to the single-chip microcomputer 6;

2) As the radius of the corrugated paper 1 on the drum 3 decreases, the rotational speed of the drum 3 will increase, and the sensor will send the measured servo motor speed and the tension signal of the corrugated paper 1 to the single-chip microcomputer 6, and the single-chip microcomputer 6 will perform calculations based on the above data and control the excitation regulator 7. Adjust the separate excitation generator 5 to generate a suitable excitation current of the separate excitation generator, so that the separate excitation generator 5 can generate the required magnetic resistance torque of the separate excitation generator, and then control the rotation speed of the drum 3 to keep the linear speed of the drum 3 constant , so as to control the tension of corrugated paper 1;

3) The single-chip microcomputer 6 monitors the excitation voltage of the separately excited generator 5 and adjusts the excitation current to accurately control the tension of the corrugated paper 1 .

During the entire control process, the electric energy accumulator 12 supplies power to the servo motor.

In the present invention, the rotational speed of the servo motor 2 and the tension of the corrugated paper 1 are used as input signals, and the rotational speed of the servo motor 2 is used as the target rotational speed (the rotational speed of the servo motor and the force of the corrugated paper are measured by a rotational speed sensor); the rotational speed of the separately excited generator 5 is used as a feedback signal to utilize The voltage sensor 10 measures the excitation voltage of the separately-excited generator 5, and converts the rotational speed of the separately-excited generator as the actual rotational speed, which is fed back to the single-chip microcomputer 6 to form negative feedback and stabilize the system. Comparing the actual speed with the target speed, the speed deviation signal is obtained, and the deviation signal is calculated in combination with the corrugated paper force. The single-chip microcomputer 6 controls the excitation regulator 7 to adjust the excitation current of the separately excited generator 5 according to the calculation result, and then controls the magnetic resistance torque of the generator. Size, adjust the drum speed, and then keep the corrugated paper force within a stable range.

Since the rotating speed of the roller is constantly changing, in order to ensure the stable operation of the roller, it is necessary to constantly adjust the excitation current of the separately excited generator to provide a constantly changing resistance torque. In order to clarify the change of tension in this process and determine a reasonable algorithm control scheme, a mathematical model of paper tension control is established:

Setting parameters:

Paper roll radius——r

Corrugated paper supply speed - v

Equivalent moment of inertia of paper roll and shaft——J

Paper roll and shaft quality——m

Equivalent density of paper roll and shaft——ρ

Corrugated paper width——L

The resultant force of corrugated paper——F

Angular velocity of the paper roll axis—ω

The braking torque applied by the separately excited DC generator to the shaft——M

And set the rotation damping coefficient as——ξ

According to the proportionality between the damping torque and the rotational angular velocity combined with Newton's law, the law of dynamic motion that the paper roll should follow is derived as follows:

According to the actual situation of the production line, the speed of corrugated paper in the conveying process is required to maintain a reasonable value, so the speed of corrugated paper:

It is known that the equivalent moment of inertia of the paper roll and the rotating shaft is J, and its calculation formula is:

m=ρ·(πr ² ·L)

Substitute the formula into

For a separately excited DC generator, its braking torque is proportional to the applied voltage, that is, M=kU, which can be substituted into the formula

It can be concluded from the above formula that when the speed v is stable, the braking torque M and the radius r of the corrugated paper roll directly affect the change of tension. If you want to keep the tension constant, you must follow the size of r to adjust the braking torque M. But during the whole production process, the radius r of the paper roll is always changing, which leads to the time-varying type of the coefficient control model, and the range of change is large.

In the present invention, the single-chip microcomputer is MSP430F149 or the same type single-chip microcomputer. The separately excited generator not only generates magnetic torque to adjust the rotation speed of the drum, but also obtains power from the rotation of the drum to generate electricity. The rotational speed sensor adopts a projected photoelectric rotational speed sensor, which is an indirect measuring device. The voltage sensor adopts Hall voltage sensor.

The tension control of the present invention can be applied to product production in metallurgy, textile, papermaking and other industries.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

Claims (6)

1. A tension control system for a corrugated paper production line, characterized in that: comprising a single-chip microcomputer, an excitation regulator, an externally excited generator, a speed changer, a drum, a servo motor, a rotational speed sensor, a voltage sensor, an acquisition card, and a tension sensor; The single-chip microcomputer is connected with the separately excited generator through the excitation regulator, and the armature part of the separately excited generator is connected with the drum through the transmission; the speed sensor collects the speed of the servo motor, and the voltage sensor collects the excitation voltage of the separately excited generator , the tension sensor collects the tension of the corrugated paper, the speed sensor and the voltage sensor transmit the collected data to the single-chip microcomputer through the acquisition card, the tension sensor transmits the collected data to the single-chip microcomputer, and the single-chip microcomputer makes the excitation according to the data collected by the tension sensor and the speed sensor The regulator adjusts the current of the separately excited generator to control the separately excited generator; the voltage sensor feeds back the collected data to the single chip microcomputer; The separately excited generator stores electric energy in the electric energy accumulator; The excitation regulator is connected with a DC power supply. 2. The tension control system for a corrugated paper production line according to claim 1, wherein the tension sensor is placed on the roll. 3. The tension control system for corrugated paper production line according to claim 1, characterized in that: the single-chip microcomputer is connected to the excitation regulator through a photoelectric isolation I/O card. 4. The tension control system for corrugated paper production line according to claim 1, characterized in that: said electric energy accumulator is connected with a servo motor. 5. The method for tension control using the tension control system for a corrugated paper production line described in any one of claims 1-4, is characterized in that it comprises the following steps: 1) The servo motor drives the corrugated paper on the drum to move, and the drum transmits the kinetic energy to the separately excited generator through the transmission to generate electricity; the speed sensor collects the speed of the servo motor, and the tension sensor collects the tension of the corrugated paper; the speed sensor and tension sensor transmit the collected data to MCU; 2) The single-chip microcomputer controls the excitation regulator to adjust the excitation current of the separately excited generator according to the above data; the separately excited generator controls the rotation speed of the drum according to the excitation current, thereby controlling the tension of the corrugated paper; 3) The single-chip microcomputer monitors the excitation voltage of the separately excited generator, and adjusts the excitation current to accurately control the tension of the corrugated paper. 6. The tension control system for a corrugated paper production line according to claim 1, wherein the electric energy accumulator supplies power to a servo motor.