CN110654918A - Tension calculation system and application method thereof - Google Patents
Tension calculation system and application method thereof Download PDFInfo
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- CN110654918A CN110654918A CN201910886349.2A CN201910886349A CN110654918A CN 110654918 A CN110654918 A CN 110654918A CN 201910886349 A CN201910886349 A CN 201910886349A CN 110654918 A CN110654918 A CN 110654918A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/044—Sensing web tension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
- B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
- B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/11—Dimensional aspect of article or web
- B65H2701/113—Size
- B65H2701/1133—Size of webs
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Abstract
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.
Description
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.
Example 1
As shown in fig. 1, in the production process of the gypsum plaster board, a tension sensor is mostly installed on a tension roller of a paper feeding unit, and the tension sensor is used for detecting tension change in the winding and unwinding processes, but because the liner paper of the gypsum plaster board is easy to jump in the transmission process, the detection of the tension sensor is unstable, the tension change of the liner paper cannot be monitored in real time, and the liner paper cannot be accurately prevented from being broken in the transmission process.
In order to solve the problems, the speed measuring switch is arranged on the tension roller of the paper feeding unit, the conveying speed of the protective paper is detected through the speed measuring switch at regular time, the conveying speed is converted into the tension change of each tension roller, when the conveying speed can be measured in real time, the real-time monitoring of the conveying tension of the protective paper can be realized, the conveying tension of the paper is convenient to regulate and control, the tension of the protective paper in the transmission process is effectively controlled in a reasonable range, and therefore the protective paper is effectively prevented from being broken in the transmission process.
The paper conveying device specifically 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 conveying unit 4 for conveying paper and changing the conveying direction, wherein the paper conveying unit 4 is arranged between the paper placing unit 2 and the paper receiving unit 3.
The paper placing unit 2 is provided with an initial face-protecting paper roll which is released under the power of a frequency converter, conveyed by the paper feeding unit 4 and changed in conveying direction, and is rewound on the paper receiving unit 3 after other face-protecting paper processing, such as cutting and the like.
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 frequency converters 1 of the paper placing unit 2 and the paper receiving unit 3 are respectively connected with a brake resistor 8, the brake resistor 8 is used for reducing the speed of the frequency converter 1, and the brake resistor 8 is a corrugated resistor and is mainly used in a mechanical system for controlling the motor to stop rapidly by the frequency converter to help the motor to convert the regenerated electric energy generated by rapid stopping into heat energy.
When the speed of the paper placing unit 2 or the paper receiving unit 3 is adjusted to be reduced, the frequency converter 1 is in a regenerative braking state in the process of reducing the working frequency, and the kinetic energy of the dragging system is fed back to the direct current circuit, so that the direct current voltage UD is continuously increased, and even dangerous ground steps can be achieved. Therefore, the energy regenerated to the dc circuit must be consumed to keep UD within an allowable range, and the braking resistor 8 is used to consume this energy, thereby achieving a rapid deceleration of the discharging unit 2 or the splicing unit 3.
The paper feeding unit 4 is composed of a plurality of tension rollers which are unpowered and are arranged in sequence, 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. Switch 6 and tacho sensor 5 that tests the speed are connected at control system 7's input, braking resistance 8 is connected at control system 7's output, switch 6 will every test the speed of paper removal that the tension roller corresponds transmits to control system 7, tacho sensor 5 will put paper unit 2 with the current rotational speed of paper receiving unit 3 transmits to control system 7, control system 7 will every the speed of paper removal that the tension roller corresponds converts into every the paper tension of tension roller transmission, and control system 7 is according to the paper tension control of every tension roller transmission braking resistance 8's work, changes the rotational speed of putting paper unit 2 and paper receiving unit 3.
Example 2
In order to supplement the operation of the above computing system, as shown in fig. 2, the present invention further provides a method for applying a tension computing system, comprising the following steps:
and step 100, monitoring the rotating speed of the power shaft of the paper discharging unit and the rotating speed of the power shaft of the paper receiving unit in real time by a rotating speed sensor, and monitoring the moving speed of paper of each tension roller in real time by a speed measuring switch.
Each tension roller of the paper feeding unit synchronously rotates along with the paper conveying and winding actions, a speed measuring 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 paper tension transmitted by each tension roller can be converted.
The specific steps of measuring the paper moving speed of each tension roller by the speed measuring switch are as follows:
the speed measurement switch triggers the rotating speed sensor to detect the rotating speed of each tension roller at regular time, and the unit of the rotating speed is r/s;
according to the rotating speed of each tension roller and the roller diameter of each tension roller, the rotating speed of each tension roller is converted into the paper speed conveyed by each tension roller, and the circumference corresponding to one rotation of each tension roller can be calculated according to the roller diameter and further converted into the paper speed correspondingly conveyed by one rotation of each tension roller;
and setting the measurement time, calculating the length of the paper conveyed by each tension roller in the measurement time, and calculating the length of the paper, so as to facilitate the next step of the facing paper processing.
Generally, in order to ensure that the length of the protective paper conveyed by the paper discharge unit can be timely wound by the paper receiving unit and ensure that the surface tension of the protective paper is stable, the linear speed of the paper discharge unit is approximately the same as that of the paper receiving unit.
Step 200, collecting the paper moving speed of each tension roller and the standard tension of each tension roller in a plurality of groups to obtain the mathematical model logical relation between the paper moving speed and the paper tension, and converting the paper moving speed into the paper tension correspondingly detected by each tension roller.
The accuracy of paper moving speed collection of every tension roller is high to it does not receive influence such as air current, paper shake to gather paper moving speed, consequently converts paper moving speed into the tensile degree of accuracy of paper high, guarantees data acquisition's accuracy, and then realizes the automatic accurate function of regulating and control of tension.
And 300, collecting the paper tension of all tension rollers at regular time, and counting the change rule of the paper tension detected by each tension roller along with the conveying of the paper placing unit.
The roll diameter of the paper roll is smaller and smaller along with the conveying of the paper roll of the paper discharging unit, the roll diameter of the paper roll of the opposite paper receiving unit is larger and larger, so that the linear speeds of the paper discharging unit and the paper receiving unit are kept the same, in the process of conveying paper, the tension of the protective paper conveyed on each tension roller is detected in time, the situation that the normal conveying of the protective paper is influenced due to the fact that the tension of the protective paper is too large or too small is avoided, the stability of the tension of the protective paper is kept, the rotating speeds of the paper discharging unit and the paper receiving unit need to be adjusted continuously, and the linear speeds of the paper discharging.
In order to solve the problems, the tension of the conveying face paper on each tension roller needs to be collected at regular time, the tension of the face paper in the next conveying stage is predicted, and the situation that the transmission of the face paper is influenced due to the fact that the tension of the face paper is too large or too small is avoided.
Therefore, the invention is divided into two research directions, the first is to process the tension data mean value of all tension rollers and count the relation between the tension changes of the whole tension roller in the process of conveying the mask paper; the second is the relationship between the tension changes of the single tension roller in the process of conveying the mask paper.
For the first type, the tension data mean value processing of all tension rollers is carried out, the relation among the tension changes of the whole tension roller in the process of conveying the mask paper is counted, and the specific steps of uniformly judging the tension changes when the whole tension roller conveys the paper are as follows:
(1) triggering a speed measuring switch at equal time intervals, and calculating tension data of each tension roller;
(2) 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;
(3) 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;
(4) and determining a tension change curve of the whole tension roller by linear fitting in a two-dimensional coordinate system.
After a tension change curve of the integral tension roller is obtained, tension change in the paper releasing and conveying process can be integrally predicted according to the rotating speed conditions of the current paper releasing unit and the paper receiving unit, so that the tension change value is compared with standard tension in real time, the rotating speed of the paper releasing unit and the paper receiving unit is adjusted, the tension of the protective paper conveyed by the tension roller between the paper releasing unit and the paper receiving unit is guaranteed to be slightly smaller than the standard tension value, and the protective paper is prevented from being broken in the conveying process.
For the second type, in the process of conveying the protective paper, the specific steps of counting the tension change of a single tension roller are as follows:
(1) and triggering a speed measuring switch at regular time, and calculating tension data of each tension roller.
When the tension of each tension roller is calculated, the large error value and the small error value of the tension data are removed from the paper moving speed data collected at regular time, and the effective stability of the tension data of each tension roller is ensured.
(2) 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;
(3) and determining the tension change curve of each tension roller by linear fitting in a two-dimensional coordinate system.
After the tension change curve of each tension roller is obtained, the tension change curves of all the tension rollers are concentrated into a two-dimensional coordinate system, the tension change of each tension roller in the paper releasing and conveying process can be compared, meanwhile, the standard tension for conveying the protective paper is increased in the tension change curve of each tension roller, the rotating speeds of the paper releasing unit and the paper receiving unit are adjusted according to the relation between the tension change curve and the standard tension, and the tension value of the protective paper conveyed by the tension rollers between the paper releasing unit and the paper receiving unit is guaranteed to be slightly smaller than the standard tension value.
The invention respectively establishes the average tension change curve of the whole tension roller and the single tension change curve of the single tension roller, and can reduce the error by calculating the average tension value, thereby leading the experimental result to be closer to the theoretical value. And the tension change curve of single tension roller is compared alone, can avoid single tension roller's the moment tension value to reach standard tension, effectively adjusts the transmission speed of putting paper unit and receiving unit, can avoid the too big cracked condition that produces of tension.
If the paper feeding unit and the paper receiving unit are in the current rotating speed condition, when the tension monitored by the tension roller is gradually increased, the rotating speed of the paper feeding unit or the paper receiving unit needs to be changed, and in the process of changing the rotating speed, the tension change range detected by each tension roller is large, so that in the process of adjusting the rotating speed of the paper feeding unit or the paper receiving unit, in order to avoid the tension data in the adjusting process from influencing data analysis, the control system processes the received data to operate as follows:
1) 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;
2) 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;
3) and eliminating the tension calculated value in the period that the rotating speed of the paper receiving unit is changed to be stable.
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.
And according to the tension change curve of each tension roller, deducing the relation between the maximum tension which can be borne by the paper and the rotating speed of the paper receiving unit, automatically controlling the brake resistor of the paper releasing unit or the paper receiving unit to work, and slowing down or accelerating the paper releasing and receiving work.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
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.
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