阅读说明：本技术 一种张力计算系统及其应用方法 (Tension calculation system and application method thereof ) 是由 杨正波 杨小东 董雷 于 2019-09-19 设计创作，主要内容包括：本发明实施例公开了一种张力计算系统及其应用方法,包括由变频器驱动的放纸单元、由变频器驱动的接纸单元,以及对纸张传送并改变输送方向的送纸单元,送纸单元设置在放纸单元与接纸单元之间；放纸单元和接纸单元的动力轴上分别设有用于检测变频器转速的转速传感器；送纸单元的每个张力辊上设有用于测量纸张移动速度的测速开关；转速传感器和测速开关均连接有控制系统；本方案可实现对护面纸输送张力的实时监测,便于调控纸张输送张力,将护面纸在传输过程中的张力有效的控制在合理范围内,从而有效的避免护面纸在传输过程中断裂。(The embodiment of the invention discloses a tension calculation system and an application method thereof, wherein the tension calculation system comprises a paper placing unit driven by a frequency converter, a paper receiving unit driven by the frequency converter, and a paper feeding unit for conveying paper and changing the conveying direction, wherein the paper feeding unit is arranged between the paper placing unit and the paper receiving unit; the power shafts of the paper placing unit and the paper receiving unit are respectively provided with a rotating speed sensor for detecting the rotating speed of the frequency converter; each tension roller of the paper feeding unit is provided with a speed measuring switch for measuring the moving speed of the paper; the rotating speed sensor and the speed measuring switch are both connected with a control system; this scheme can realize carrying tensile real-time supervision to the mask paper, is convenient for regulate and control paper and carries tension, with the effectual control of mask paper in the tension of transmission in reasonable within range to effectually avoid the mask paper fracture in transmission course.)

1. A tension calculation system, characterized by: the paper receiving device comprises a paper placing unit (2) driven by a frequency converter (1), a paper receiving unit (3) driven by the frequency converter (1), and a paper feeding unit (4) for conveying paper and changing the conveying direction, wherein the paper feeding unit (4) is arranged between the paper placing unit (2) and the paper receiving unit (3);

the power shafts of the paper placing unit (2) and the paper receiving unit (3) are respectively provided with a rotating speed sensor (5) for detecting the rotating speed of the frequency converter (1);

the paper feeding unit (4) is composed of a plurality of tension rollers which are unpowered and are sequentially arranged, the tension rollers synchronously rotate under the driving of paper conveying and winding power, and a speed measuring switch (6) for measuring the moving speed of the paper is arranged on each tension roller of the paper feeding unit (4);

and the rotating speed sensor (5) and the speed measuring switch (6) are both connected with a control system (7).

2. A tension force calculation system as defined in claim 1, wherein: the frequency converters (1) of the paper placing unit (2) and the paper receiving unit (3) are respectively connected with a brake resistor (8), and the brake resistor (8) is used for reducing the speed of the frequency converters (1).

3. A tension force calculation system as claimed in claim 2, wherein: the speed measuring device is characterized in that an input end of a control system (7) is connected with a speed measuring switch (6) and a speed sensor (5), an output end of the control system (7) is connected with a brake resistor (8), the speed measuring switch (6) transmits each paper moving speed corresponding to the tension roller to the control system (7), the speed sensor (5) transmits the paper placing unit (2) and the current rotating speed of the paper receiving unit (3) to the control system (7), the control system (7) converts each paper moving speed corresponding to the tension roller into each paper tension transmitted by the tension roller, the control system (7) controls the work of the brake resistor (8) according to the paper tension transmitted by each tension roller, and the rotating speeds of the paper placing unit (2) and the paper receiving unit (3) are changed.

4. A method of using a tension calculation system, comprising the steps of:

step 100, a rotating speed sensor monitors the rotating speed of a power shaft of a paper discharging unit and the rotating speed of a power shaft of a paper receiving unit in real time, and a speed measuring switch monitors the moving speed of paper of each tension roller in real time;

step 200, converting the paper moving speed of each tension roller into the paper tension correspondingly detected by each tension roller;

step 300, collecting the paper tension of all tension rollers at regular time, and counting the change rule of the paper tension data detected by each tension roller along with the conveying of the paper placing unit;

and step 400, comparing the tension data of each tension roller with the maximum tension which can be borne by the paper, and adjusting the rotating speed of the paper feeding unit and the paper receiving unit.

5. The method as claimed in claim 4, wherein in step 100, each tension roller of the paper feeding unit rotates synchronously with the paper feeding and winding actions, the speed measuring switch on the tension roller of the paper feeding unit detects the speed of the tension roller, the paper feeding moving speed can be measured according to the speed of the tension roller, and the specific steps of the speed measuring switch measuring the paper moving speed of each tension roller are as follows:

the speed measurement switch triggers the rotating speed sensor to detect the rotating speed of each tension roller at regular time;

converting the rotating speed of each tension roller into the paper speed conveyed by each tension roller according to the rotating speed of each tension roller and the roller diameter of each tension roller;

a measurement time is set, and the length of the sheet conveyed by each tension roller during the measurement time is calculated.

6. The method of claim 4, wherein in step 300, the first method of statistics of the variation law of the paper tension data is to perform an average processing on the tension data of all tension rollers to calculate the relationship between the tension variations of the tension rollers during the transportation of the cover paper; the second method is to count the relationship between the tension changes of the single tension roller during the process of conveying the protective paper.

7. The method of claim 6, wherein in step 300, the tension of each tension roller of the paper feeding unit is related to the speed of the paper splicing unit, and the step of counting the tension variation of each tension roller is as follows:

and triggering a speed measuring switch at regular time, and calculating tension data of each tension roller.

Synchronously measuring the thickness of the paper roll of the paper placing unit, and establishing a functional relation between the thickness of the paper roll of the paper placing unit and the tension data;

and determining the tension change curve of each tension roller by linear fitting in a two-dimensional coordinate system.

8. The method of claim 6, wherein in step 300, the tension data of all tension rollers are processed in an average manner, the relationship between tension changes of the whole tension roller during the process of conveying the protective paper is counted up, and the specific steps of uniformly judging the tension changes of the whole tension roller during the process of conveying the paper are as follows:

triggering a speed measuring switch at equal time intervals, and calculating tension data of each tension roller;

removing the maximum value and the minimum value of tension data from the collected paper moving speed data every time, and extracting a plurality of stable tension data corresponding to each tension roller;

synchronously measuring the thickness of the paper roll of the paper placing unit, and establishing a functional relation between the thickness of the paper roll of the paper placing unit and stable tension data of all tension rollers;

and determining a tension change curve of the whole tension roller by linear fitting in a two-dimensional coordinate system.

9. The method of claim 7, wherein in step 400, the relationship between the maximum tension that the paper can bear and the rotation speed of the paper receiving unit is inferred according to the tension variation curve of each tension roller, and the braking resistance of the paper discharging unit or the paper receiving unit is automatically controlled to operate, and the paper discharging and receiving operation is slowed down or accelerated.

10. The method as claimed in claim 8, wherein when the paper feeding unit and the paper receiving unit adjust the rotation speed, the control system processes the received data to:

recording the time point when the paper receiving unit changes the rotating speed, namely the time point when the corresponding brake resistor works, and starting to change the rotating speed of the paper receiving unit;

recording the time point of the stable rotating speed of the paper splicing unit, and counting the tension change in the time period from the rotating speed change of the paper splicing unit to the rotating speed stabilization period of the paper splicing unit;

and eliminating the tension calculated value in the period that the rotating speed of the paper receiving unit is changed to be stable.

Technical Field

The embodiment of the invention relates to the technical field of gypsum board production, in particular to a tension calculation system and an application method thereof.

Background

On the paper feeder of supplying mask paper for gypsum board production, in the mask paper in-process after receiving processing is accepted to the paper receiving machine, in order to guarantee that the tension of mask paper in the transmission process does not exceed the setting value, the magnitude of tension needs to be regularly detected to the mask paper in the transmission, most of the existing tension detection directly has the direct signal monitoring of a tension sensor, because the mask paper is influenced by air flow, paper jitter and the like in the transmission process, the fluctuation of the monitoring data of the tension sensor is large, accurate measurement is difficult to realize, although some interference signals can be processed through means such as signal filtering, the true value at the moment of fluctuation sometimes can be flat and straight, and the tension monitoring is unstable.

Therefore, in order to stably and accurately calculate the tension value of the protective paper in the transmission process, a tension calculation system which is simple in calculation, high in accuracy and free from the influence of paper fluctuation or air flow is urgently needed.

Disclosure of Invention

Therefore, the embodiment of the invention provides a tension calculation system and an application method thereof, which convert the conveying speed into the tension change passing through each tension roller, and measure the conveying speed of the tension roller in real time, so that the real-time monitoring of the conveying tension of the facing paper can be realized, and the problems of multiple influence factors and inaccurate calculation caused by the utilization of a tension sensor in the prior art are solved.

In order to achieve the above object, an embodiment of the present invention provides the following: a tension calculation system comprises a paper placing unit driven by a frequency converter, a paper receiving unit driven by the frequency converter, and a paper feeding unit for conveying paper and changing the conveying direction, wherein the paper feeding unit is arranged between the paper placing unit and the paper receiving unit;

the power shafts of the paper placing unit and the paper receiving unit are respectively provided with a rotating speed sensor for detecting the rotating speed of the frequency converter;

the paper feeding unit consists of a plurality of tension rollers which are unpowered and are sequentially arranged, the tension rollers synchronously rotate under the driving of paper conveying and winding power, and each tension roller of the paper feeding unit is provided with a speed measuring switch for measuring the moving speed of the paper;

and the rotating speed sensor and the speed measuring switch are both connected with a control system.

As a preferable aspect of the present invention, the frequency converters of the paper feeding unit and the paper receiving unit are respectively connected with a braking resistor, and the braking resistor is used for performing deceleration processing on the frequency converters.

As a preferable scheme of the present invention, the speed measurement switch and the rotation speed sensor are connected to an input end of a control system, the brake resistor is connected to an output end of the control system, the speed measurement switch transmits a paper moving speed corresponding to each tension roller to the control system, the rotation speed sensor transmits current rotation speeds of the paper feeding unit and the paper splicing unit to the control system, the control system converts a paper moving speed corresponding to each tension roller into a paper tension transmitted by each tension roller, and the control system controls operation of the brake resistor according to the paper tension transmitted by each tension roller to change the rotation speeds of the paper feeding unit and the paper splicing unit.

In addition, the invention also provides an application method of the tension calculation system, which comprises the following steps:

step 100, a rotating speed sensor monitors the rotating speed of a power shaft of a paper discharging unit and the rotating speed of a power shaft of a paper receiving unit in real time, and a speed measuring switch monitors the moving speed of paper of each tension roller in real time;

step 200, converting the paper moving speed of each tension roller into the paper tension correspondingly detected by each tension roller;

step 300, collecting the paper tension of all tension rollers at regular time, and counting the change rule of the paper tension data detected by each tension roller along with the conveying of the paper placing unit;

and step 400, comparing the tension data of each tension roller with the maximum tension which can be borne by the paper, and adjusting the rotating speed of the paper feeding unit and the paper receiving unit.

As a preferred aspect of the present invention, in step 100, each tension roller of the paper feeding unit rotates synchronously with the paper conveying and winding action, a speed measurement switch on the tension roller of the paper feeding unit detects the speed of the tension roller, the paper conveying and moving speed can be measured according to the speed of the tension roller, and the specific steps of the speed measurement switch measuring the paper moving speed of each tension roller are as follows:

the speed measurement switch triggers the rotating speed sensor to detect the rotating speed of each tension roller at regular time;

converting the rotating speed of each tension roller into the paper speed conveyed by each tension roller according to the rotating speed of each tension roller and the roller diameter of each tension roller;

a measurement time is set, and the length of the sheet conveyed by each tension roller during the measurement time is calculated.

As a preferred scheme of the present invention, in step 300, the first method for counting the change rule of the paper tension data is to perform mean processing on the tension data of all tension rollers, and count the relationship between the tension changes of the whole tension rollers in the process of conveying the protective paper; the second method is to count the relationship between the tension changes of the single tension roller during the process of conveying the protective paper.

As a preferred aspect of the present invention, in step 300, the tension of each tension roller of the paper feeding unit is related to the speed of the paper splicing unit, and the specific steps of counting the tension variation of a single tension roller are as follows:

and triggering a speed measuring switch at regular time, and calculating tension data of each tension roller.

Synchronously measuring the thickness of the paper roll of the paper placing unit, and establishing a functional relation between the thickness of the paper roll of the paper placing unit and the tension data;

and determining the tension change curve of each tension roller by linear fitting in a two-dimensional coordinate system.

As a preferred embodiment of the present invention, in step 300, the tension data of all tension rollers are processed by mean, the relationship between the tension changes of the entire tension roller during the process of conveying the protective paper is counted, and the specific steps of uniformly judging the tension changes of the entire tension roller during the process of conveying the paper are as follows:

triggering a speed measuring switch at equal time intervals, and calculating tension data of each tension roller;

removing the maximum value and the minimum value of tension data from the collected paper moving speed data every time, and extracting a plurality of stable tension data corresponding to each tension roller;

synchronously measuring the thickness of the paper roll of the paper placing unit, and establishing a functional relation between the thickness of the paper roll of the paper placing unit and stable tension data of all tension rollers;

and determining a tension change curve of the whole tension roller by linear fitting in a two-dimensional coordinate system.

In a preferred embodiment of the present invention, in step 400, a relationship between a maximum tension that the paper can bear and a rotation speed of the paper receiving unit is inferred according to a tension variation curve of each tension roller, and a braking resistor of the paper discharging unit or the paper receiving unit is automatically controlled to operate, and the paper discharging and receiving unit is slowed down or accelerated.

As a preferred aspect of the present invention, when the paper feeding unit and the paper receiving unit adjust the rotation speed, the control system processes the received data by:

recording the time point when the paper receiving unit changes the rotating speed, namely the time point when the corresponding brake resistor works, and starting to change the rotating speed of the paper receiving unit;

recording the time point of the stable rotating speed of the paper splicing unit, and counting the tension change in the time period from the rotating speed change of the paper splicing unit to the rotating speed stabilization period of the paper splicing unit;

and eliminating the tension calculated value in the period that the rotating speed of the paper receiving unit is changed to be stable.

The embodiment of the invention has the following advantages:

the invention converts the conveying speed into the tension change passing through each tension roller, and when the conveying speed can be measured in real time, the real-time monitoring of the conveying tension of the facing paper can be realized, the conveying tension of the paper is convenient to regulate and control, and the tension of the facing paper in the conveying process is effectively controlled within a reasonable range, so that the breakage of the facing paper in the conveying process is effectively avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a block diagram of a tension calculation system according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a tension application method according to an embodiment of the present invention.

In the figure: 1-a frequency converter; 2-a paper placing unit; 3-a paper receiving unit; 4-a paper feeding unit; 5-a rotation speed sensor; 6-speed measuring switch; 7-a control system; 8-brake resistance.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.