Method for detecting diameter of paper placing roll of kraft paper packaging machine

Abstract

The invention relates to a kraft paper packaging machine paper unwinding roll diameter detection method, in the kraft paper packaging process, firstly, paper of a paper unwinding roll is in a tightened state, the linear speed of a bottom roller is the same as the linear speed of the paper unwinding roll, and the current rotating speed of a bottom roller motor and the rotating speed of a paper unwinding roller motor are obtained through a bottom roller frequency converter and a paper unwinding roller frequency converter; and the diameter data of the paper feeding roller is obtained through formula conversion. In practical application, a sensor is omitted, the cost is saved, the diameter of the paper roll can be accurately detected regardless of the size of the diameter of the placed paper roll, manual adjustment is not needed in the follow-up process, and the workload of operators is reduced. The only work to be done by an operator is that the diameter value of a new paper roll needs to be input when the new paper roll is replaced, and the diameter of the subsequent paper roll is obtained through detection and calculation of the system.

Description

Technical Field

[0001] The invention relates to a fully automatic kraft paper packaging machine equipment for a papermaking enterprise, in particular to a method for detecting the diameter of a paper roll of a kraft paper packaging machine. Background Art

[0002] At present, many papermaking enterprises use kraft paper packaging machines to prevent paper rolls from getting damp and ensure the quality of paper. The entire paper roll packaging is first placed in the inner head (corrugated cardboard), and the paper roll body is wrapped with coated kraft paper. The coated kraft paper beyond the end surface is folded by the folding wheel and then close to the end surface of the paper roll. The outermost end is heated and pressed to the end surface of the paper roll by hot pressing. The principle of the roll wrapping station is as follows: Figure 1 As shown: the paper feeding roller 3, the paper placing roller 2 and the bottom roller 5 are started, the paper is fed into the bottom roller 5, the paper roll 4 is wrapped on the paper roll 1, and the packaging of the paper roll body is completed.

[0003] Before the entire packaging process begins, the diameter of the paper roll (wrapping paper) must be confirmed, and the speed of the paper roll drive motor must be confirmed based on the diameter data. In the past, there were the following methods:

[0004] (1) By using the detection and measurement method, an ultrasonic sensor or a laser distance sensor is placed directly above the paper roll, so that the diameter data of the paper roll can be accurately obtained. In particular, the laser distance sensor can obtain accurate data when the paper roll diameter is small (about 150 mm in diameter). However, since the sensor is located directly above the paper roll, it is inconvenient to lift and replace the paper roll (wrapping paper roll), and the sensor is easily damaged.

[0005] (2) Through the detection and measurement method, since the first method is easy to cause damage to the sensor, the second method changes the installation position of the sensor and installs the sensor at the 7:30 direction of the paper roll, with the direction aligned with the center of the paper roll. Although method 2 avoids damage to the sensor, once the paper roll slips or the paper roll is loose, the paper may cover the sensor surface, causing a large deviation in the measurement, especially for ultrasonic sensors.

[0006] (3) By calculation. When replacing the paper roll, first input the diameter data of the paper roll, and calculate the paper length of the paper roll and the diameter data of the remaining paper roll according to the diameter and number of layers of the wrapped paper roll and the thickness of the paper roll. This method is more accurate when the paper roll diameter is large at the beginning. As the use continues, the accumulated error will become larger and larger, and finally manual adjustment is required. Although this method abandons the method of using sensor measurement and saves costs, it will increase the operation process of the operator. Summary of the invention

[0007] The present invention provides a method for detecting the diameter of a paper roll of a kraft paper packaging machine, which can abandon the sensor detection method to save costs, and can accurately detect or calculate the diameter of the paper roll, thereby reducing the workload of operators.

[0008] To achieve the above-mentioned purpose, the technical solution of the present invention is: a method for detecting the diameter of a paper roll of a kraft paper packaging machine. During the kraft paper packaging process, first, the paper of the paper roll is in a taut state, the linear speed of the bottom roller is the same as the linear speed of the paper roll, and the current rotation speed of the bottom roller and the paper roll motor is obtained through the bottom roller inverter and the paper roll inverter, and then, the diameter data of the paper roll is obtained by converting the formula.

[0009] Furthermore, the bottom roller motor and the paper placing roller motor are both controlled by a frequency converter and have encoder feedback on the motor side to obtain accurate motor speed values.

[0010] Furthermore, the linear speed of the bottom roller is made the same as the linear speed of the paper roll. The specific method is: first, ensure that the paper on the paper roll is in a taut state, the paper on the paper roll is fed into the bottom roller by the paper feeding roller, and the paper is glued to the wrapped paper roll after being sprayed with glue; the paper feeding roller in the control is turned on, and the control of the paper roll is switched to the torque limiting control mode. The input speed of the paper roll is less than the running speed of the bottom roller. After switching to the torque control, the paper on the paper roll is taut, and the bottom roller pulls the paper roll to run through the set torque, so that the linear speed of the bottom roller is the same as the linear speed of the paper roll.

[0011] Furthermore, the specific method of converting the formula to obtain the diameter data of the paper placing roller is: based on the linear speed of the bottom roller being the same as the linear speed of the paper placing roller, the diameter of the paper placing roller is calculated by the following formula:

[0012]

[0013] Among them: R1 is the diameter of the paper roll, n1 is the speed of the paper roller motor, i1 is the speed ratio of the paper roll motor, R2 is the diameter of the bottom roll, n2 is the speed of the bottom roll motor, i2 is the speed ratio of the bottom roll motor; among them, n1 and n2 are read through the frequency converter, i1 and i2 are obtained from the reducer nameplate, R2 is the known data of the bottom roll diameter, and the paper roll diameter data is calculated by this formula.

[0014] The beneficial effects of the present invention are:

[0015] In practical applications, when the paper on the paper roll is taut, a time point is set to simultaneously read the rotation speed values ​​of the paper roll inverter and the bottom roll inverter, and the diameter data of the paper roll is obtained by calculation. The effect is remarkable in practical application. This method not only eliminates the sensor and saves costs, but also can accurately detect the diameter of the paper roll regardless of the diameter of the paper roll, and no manual adjustment is required later, reducing the workload of the operator. The only work that the operator needs to do is to input the new diameter value of the paper roll when replacing the new paper roll, and the subsequent diameter of the paper roll is obtained by system detection and calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the schematic diagram of the roll package;

[0017] In the figure: 1. paper roll (wrapping paper roll), 2. paper roller, 3. paper feed roller, 4. paper roll, 5. bottom roller. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] The present invention provides a method for detecting the diameter of a paper roll of a kraft paper packaging machine. During the packaging process, Figure 1 As shown in the figure, if the paper of the paper roll is taut, the linear speed of the bottom roller is the same as that of the paper roll. The current motor speed is obtained through the bottom roller inverter and the paper roll inverter, and the diameter data of the paper roll is obtained through the formula.

[0020] In the embodiment, the bottom roller motor and the paper placing roller motor are both controlled by a frequency converter and the motor side is provided with encoder feedback to obtain an accurate motor speed value.

[0021] In this example, first ensure that the paper on the paper roll is in a taut state when the reading point is reached. The paper on the paper roll is fed into the bottom roll by the paper feed roll, and the paper is attached to the wrapped paper roll after the glue is sprayed. In this example, the paper feed roll is turned on, and the control of the paper roll is switched to the torque limit control mode. The input speed of the paper roll is less than the running speed of the bottom roll. After switching to torque control, the actual situation is that the paper on the paper roll is taut, and the bottom roll is pulled by the set torque to run the paper roll, and the linear speed of the bottom roll is the same as the linear speed of the paper roll.

[0022] According to the linear speed of the bottom roller being the same as that of the paper placing roller, the diameter of the paper placing roller is calculated by the following formula:

[0023]

[0024] Among them: R1 is the diameter of the paper roll, n1 is the speed of the paper roller motor, i1 is the speed ratio of the paper roll motor, R2 is the diameter of the bottom roll, n2 is the speed of the bottom roll motor, and i2 is the speed ratio of the bottom roll motor.

[0025] Among them, n1 and n2 are read by the inverter, i1 and i2 are obtained from the reducer nameplate, and the diameter of the bottom roller R2 is known data. The diameter data of the paper roller is calculated by this formula.

Claims

1. A method for detecting the diameter of a paper roll of a kraft paper packaging machine, characterized in that: In the process of kraft paper packaging, first, the paper on the paper roll is kept in a taut state, the linear speed of the bottom roller is the same as the linear speed of the paper roll, the current rotation speed of the bottom roller and paper roll motor is obtained through the bottom roller inverter and the paper roll inverter, and then the diameter data of the paper roll is converted through the formula.

2. The method for detecting the diameter of the paper roll of a kraft paper packaging machine according to claim 1, characterized in that: The bottom roller motor and paper feed roller motor are both controlled by a frequency converter and have encoder feedback on the motor side to obtain accurate motor speed values.

3. The method for detecting the diameter of the paper roll of a kraft paper packaging machine according to claim 1, characterized in that: The specific method for making the linear speed of the bottom roller the same as the linear speed of the paper roll is as follows: first, ensure that the paper on the paper roll is in a taut state, the paper on the paper roll is fed into the bottom roller by the paper feeding roller, and the paper is glued to the wrapped paper roll after being sprayed with glue; the paper feeding roller in the control is turned on, and the control of the paper roll is switched to the torque limiting control mode. The input speed of the paper roll is less than the running speed of the bottom roller. After switching to torque control, the paper on the paper roll is taut, and the bottom roller pulls the paper roll to run through the set torque, so that the linear speed of the bottom roller is the same as the linear speed of the paper roll.

4. The method for detecting the diameter of the paper roll of a kraft paper packaging machine according to claim 1, characterized in that: The specific method of converting the formula to obtain the diameter data of the paper placing roller is: based on the linear speed of the bottom roller being the same as the linear speed of the paper placing roller, the diameter of the paper placing roller is calculated using the following formula: Among them: R1 is the diameter of the paper roll, n1 is the speed of the paper roller motor, i1 is the speed ratio of the paper roll motor, R2 is the diameter of the bottom roll, n2 is the speed of the bottom roll motor, i2 is the speed ratio of the bottom roll motor; among them, n1 and n2 are read through the frequency converter, i1 and i2 are obtained from the reducer nameplate, R2 is the known data of the bottom roll diameter, and the paper roll diameter data is calculated by this formula.

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