CN113858568A - Adhesive tape width closed-loop control method and control device - Google Patents
Adhesive tape width closed-loop control method and control device Download PDFInfo
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- CN113858568A CN113858568A CN202111184317.1A CN202111184317A CN113858568A CN 113858568 A CN113858568 A CN 113858568A CN 202111184317 A CN202111184317 A CN 202111184317A CN 113858568 A CN113858568 A CN 113858568A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
Abstract
The invention discloses a closed-loop control method and a closed-loop control device for the width of a rubber strip. The method comprises the steps of obtaining a real-time width value of an adhesive tape; reading the real-time width value in a time-sharing manner, setting a timed interrupt to perform PID calculation, calculating an actual speed ratio between the extruder and the profiling roller, and comparing the obtained actual speed ratio with a preset standard speed ratio value; adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the preset standard speed ratio; and acquiring the real-time width value of the adhesive tape again, and repeating the steps to realize the closed-loop control of the adhesive tape width. The device is used for implementing the method, the adhesive tape width is acquired in real time, the adhesive tape width value is read in a time-sharing manner, whether the profiling/extrusion speed ratio meets a preset standard value or not is judged according to the adhesive tape width value by adopting timed interruption, the profiling roller is adjusted, and the stretching/stacking of the adhesive tape is controlled, so that the adhesive tape width is controlled to be stable.
Description
Technical Field
The invention relates to the technical field of tire manufacturing, in particular to a rubber strip width closed-loop control method and a control device.
Background
In the production and manufacturing of the tire, due to the fact that the requirement for splicing precision of a high-end tire section is improved, and the requirement that a special part of a giant tire cannot be extruded and molded at one time is met, profiling winding needs to be conducted on the tire, the section of a winding adhesive tape needs to be accurately controlled in order to guarantee winding size and weight stability in winding, the adhesive tape is extruded by a compression roller and is in a special trapezoid shape, the stretching angle of the adhesive tape is detected and the width data of the adhesive tape is controlled, and relevant mapping can be conducted on the adhesive tape section. Because the adhesive tape is stressed to generate shaking and deformation under different pulling forces, a plurality of uncertainties exist in the size of the whole winding section, and the traditional measuring and controlling device is high in complexity, complex in algorithm, more in limitation to external conditions and greatly limited in practical use.
Disclosure of Invention
Therefore, the invention aims to provide a closed-loop control method and a control device for the width of an adhesive tape, which are used for acquiring the width of the adhesive tape in real time, reading the width value of the adhesive tape in a time-sharing manner, judging whether the ratio of the profiling speed to the extrusion speed meets a preset standard value or not according to the width value of the adhesive tape by adopting timing interruption, adjusting a profiling roller, and controlling the stretching/stacking of the adhesive tape out of the profiling roller so as to control the width of the adhesive tape to be stable.
As shown in fig. 1, the present invention provides a closed-loop control method for the width of a rubber strip, comprising the following steps:
s1, acquiring a real-time width value of the adhesive tape;
s2, reading the real-time width value in a time-sharing manner, setting a timing interruption to perform PID calculation, calculating the actual speed ratio between the extruder and the profiling roller, and comparing the obtained actual speed ratio with a preset standard speed ratio; the preset standard speed ratio is calculated by the following steps:
s201, obtaining previous adhesive tape width values and corresponding speeds of an extruder and a profiling roller under each previous adhesive tape width value;
s202, under a certain rubber strip width value, taking the speed of an extruder as a horizontal axis and the speed of a profiling roller as a vertical axis, and drawing a linear fitting curve of the speed ratio of the extruder to the profiling roller according to the speed ratio variation trend of different extruders at different speeds;
s203, setting a fluctuation range according to the width value of the past rubber strip by adopting a PID algorithm, keeping the speed of the profiling roller unchanged, drawing a corresponding speed ratio value nonlinear fitting curve when the speeds of different extruders are different, and obtaining the speed ratio of the extruder and the profiling roller as a preset standard speed ratio;
s3, adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the preset standard speed ratio;
and S4, acquiring the real-time width value of the adhesive tape again, and repeating the steps S2-S3 to realize the closed-loop control of the adhesive tape width.
Further preferably, in S1, the method for acquiring the real-time width value of the adhesive tape includes the following steps:
acquiring position pixels reflected on the reflector when the infrared light source is shielded by the adhesive tape;
and calculating the real-time width value of the rubber strip according to the position pixels.
Further preferably, calculating the actual speed ratio between the extruder and the profiling roll based on the real-time width value comprises the steps of:
acquiring a real-time adhesive tape width value;
and (5) performing quadratic curve fitting on all the previous rubber strip width values in the step (S201) and the corresponding speed ratio values of the extruder and the profiling roller, and obtaining a relational expression of the rubber strip width values and the speed ratio values according to a fitting curve formed by quadratic curve fitting.
Further preferably, in S3, the adjusting the profiling speed of the profiling roller according to the difference between the actual speed ratio and the standard speed ratio includes the following steps:
s301, searching a preset standard speed ratio corresponding to the real-time adhesive tape width value according to the acquired real-time adhesive tape width value;
s302, comparing an actual speed ratio value obtained by calculation according to the speed ratio value relational expression with a preset standard speed ratio value, wherein the set speed ratio value is the compression roller speed/the extruder speed, and when the actual speed ratio value is larger than the preset standard speed ratio value, keeping the speed of the extruder unchanged and regulating the compression roller speed; when the actual speed ratio value is smaller than the preset standard speed ratio value, keeping the speed of the extruder unchanged, and regulating the speed of the high-pressure compression roller; and when the actual speed ratio value is equal to the preset standard speed ratio value, keeping the speed of the extruder and the speed of the profiling roller unchanged.
The invention also provides a rubber strip width closed-loop control device which is used for implementing the control method and comprises a width measuring device, an extruder, a profiling roller and a PLC (programmable logic controller);
extruding the rubber material by the extruder at a constant speed according to a set speed;
the compression roller is used for compressing the extruded rubber material to form an adhesive tape;
the width measuring device is used for acquiring the real-time width value of the adhesive tape;
the PLC is used for reading the real-time width value in a time-sharing manner, setting a timing interruption to perform PID calculation, calculating an actual speed ratio between the extruder and the profiling roller, and comparing the obtained actual speed ratio with a preset standard speed ratio; and adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the preset standard speed ratio.
Further preferably, the width measuring device comprises an infrared width measuring sensor and a reflector; the infrared width measuring sensor is used for emitting infrared light and acquiring position pixels reflected on the reflector when the infrared light source is shielded by the rubber strip.
Further preferably, the adhesive tape feeding device further comprises an adhesive tape guide roller for guiding the adhesive tape to smoothly pass through the width measuring device.
Further preferably, the adhesive tape guide roller consists of 2 round rollers which are fixed in parallel up and down; the upper guide roll is arranged at a discharge port of the profiling roll, and the lower guide roll is arranged at the width measuring device.
Further preferably, the molding roller is formed by rolling and combining the sizing material through an upper roller and a lower roller according to the required shape; the upper roller is a trapezoidal section roller with a reverse groove, and the lower roller is a plane roller.
Compared with the prior art, the adhesive tape width closed-loop control method and the adhesive tape width closed-loop control device at least have the following beneficial effects:
1. according to the adhesive tape width closed-loop control method and the adhesive tape width closed-loop control device, the adhesive tape width is acquired in real time, the adhesive tape width value is read in a time-sharing manner, whether the compression/extrusion speed ratio meets the preset standard value or not is judged according to the adhesive tape width value by adopting timing interruption, the compression roller is adjusted, and the stretching/stacking of the adhesive compression adhesive tape is controlled, so that the adhesive tape width is controlled to be stable.
2. The adhesive tape width closed-loop control method and the adhesive tape width closed-loop control device can more stably acquire and control the adhesive tape width, can avoid overshoot and signal interference by relative real-time PID (proportion integration differentiation) adjustment, and can greatly improve the stability of the conventional adhesive tape on the basis of an easily-realized original width measurement and detection device by adding a closed-loop control program so as to improve the precision of the shape and weight of the integral winding section.
3. According to the adhesive tape width closed-loop control method and the control device, the speeds of the profiling roller and the extruder are subjected to curve fitting, and the profiling/extrusion speed ratio is obtained through calculation, so that the accurate relation between the adhesive tape width and the profiling/extrusion speed ratio is realized, the method can be expanded to the production of different adhesive tape widths, and the method is simple and convenient to popularize and apply.
Drawings
FIG. 1 is a schematic flow chart of a rubber strip width closed-loop control method of the present invention.
FIG. 2 is a schematic structural view of a rubber strip width closed-loop control device according to the present invention.
FIG. 3 is a schematic diagram of a velocity ratio fit curve of a profiling roll and an extruder in the closed-loop control method of strip width of the present invention.
FIG. 4 is a schematic diagram of PID adjustment in the adhesive tape width closed-loop control method of the invention.
In the figure:
1, a compression roller; 2, an upper guide roller; 3, a reflector; 4, infrared width measuring sensor; and 5, a lower guide roller.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1, a closed-loop control method for the width of a rubber strip includes the following steps:
s1, acquiring a real-time width value of the adhesive tape; further, in S1, the method for obtaining the width value of the adhesive tape includes the steps of: acquiring position pixels of an infrared light source, which are shielded by the adhesive tape and reflected on the reflector; calculate adhesive tape width value according to position pixel, specifically can be, according to the pixel quantity between two relative sides of count position pixel, can regard as the real-time width value of adhesive tape, adopt infrared width measuring sensor direct output measuring signal's analog quantity in this application, after carrying out digital conversion with the analog quantity, can directly obtain the real-time width value of adhesive tape.
And S2, carrying out PID calculation on the real-time width value, calculating the actual speed ratio between the extruder and the profiling roller, and comparing the obtained actual speed ratio with a preset standard speed ratio.
As shown in fig. 3, further in S2, the preset reference speed ratio is calculated by:
s201, obtaining the width value of the past adhesive tape and the corresponding speeds of an extruder and a profiling roller;
s202, under a certain rubber strip width value, taking the speed of an extruder as a horizontal axis and the speed of a profiling roller as a vertical axis, and drawing a linear fitting curve of the speed ratio of the extruder to the profiling roller according to the speed ratio variation trend under different extruder speeds; i.e. the solid line in the graph shown in fig. 3.
S203, adopting a PID algorithm, and setting a fluctuation range according to the previous adhesive tape width value, wherein the fluctuation range of all the adhesive tape width values is an error range allowed by the adhesive tape width, and for example, when the adhesive tape width is 14.95 and 15.05, the fluctuation range corresponds to the adhesive tape width value of 15. Keeping the speed of the profiling roller unchanged, and drawing a corresponding speed ratio value nonlinear fitting curve when different extruder speeds are drawn to obtain the speed ratio of the extruder and the profiling roller as a preset standard speed ratio.
Wherein, the speed of the profiling roller is kept unchanged, and when different extruder speeds are drawn, the corresponding speed ratio value nonlinear fitting curve is obtained by the following method: when the speed of the molding roller is constant at a certain value, adjusting the speed of the extruder; after the speed of the extruder is adjusted, the width value of the pressed rubber strip conforms to a set fluctuation range, and the speed value of the pressing roller corresponds to the speed value of the extruder in a specific range; when the speed value of the profiling roller is adjusted to be another fixed value, the speed of the extruder is adjusted again, so that the width value of the pressed rubber strip conforms to the set fluctuation range. Repeating the steps until all the molding roll speed values can correspond to the extruder speed values in a certain range, adjusting the extruder speed change gradient of the transverse shaft according to industrial requirements, reducing the area corresponding to the extruder speed value range corresponding to the molding roll speed values into points, and connecting the points into a line, or taking the middle value of the extruder speed value range as a value point, and connecting the points into a line; and obtaining a corresponding velocity ratio value nonlinear fitting curve (the dotted line in figure 3 is the middle value), and obtaining the velocity ratio of the extruder and the profiling roller under the fluctuation range of the width value of the rubber strip as a preset standard velocity ratio.
It should be noted that, because the width of the rubber strip is proportional to the speed ratio of the extruder to the profiling roller, and when the width of the rubber strip is changed, the speed ratio is changed, because the rubber discharge performance and the rotation speed of the extruder are not strict linear relationship, the width of the rubber strip is actually proportional to the speed ratio range, and the speed ratio range is determined, when the profiling roller speed needs to be determined to be a certain value, the speed change range of the extruder needs to be determined, so the profiling roller speed needs to be adjusted continuously. Therefore, when setting the fitting curve, it is first required to test the approximate linear speed ratio of the extruder and the profiling roller, that is, under the linear speed ratio, the width of the rubber extruded by the extruder is in a more uniform range under different speeds after profiling, and this value needs to be tested under the condition of the rubber to obtain an empirical value of the linear speed ratio, as shown in fig. 3, where the solid line is the linear speed ratio obtained when fitting linearly for the first time. And (3) drawing a dotted line in a fitting curve chart, which is a nonlinear linear speed ratio in a real state, according to the speed ratio change of different extruders at different speeds under the condition that the final width closed-loop program operation rubber strip is basically in small-range fluctuation or stability.
For example, in the actual control, the conventional adhesive tape width values are respectively 15cm, 16cm and 17 cm; because the width value of the rubber strip is related to the speed ratio, taking the rubber strip width value of 15cm as an example, the speed of the corresponding forming roll is y1, and the speed of the extruder is x 1; or a die roll speed of y2 and an extruder speed of x 2; as long as the speed ratio a is ensured
The width value of the adhesive tape is not changed; namely, it is
When the strip width value is 15cm, a linear fitting curve (a solid line in FIG. 3) is drawn according to the corresponding multiple compression roller speeds (y 1, y2, y 3) and the extruder speeds (x 1, x2, x 3), and the slope of the curve is the speed ratio.
Since the strand discharge performance and the rotational speed of the extruder are not strictly linear, if the profiling roll speed y1 is used when the strand width is 15, the extruder speed is actually a range of values, i.e., (I)
) (ii) a Thus maintaining each of the profiling roll speeds y1, y2, y3, adjusting the extruder speed to (respectively) ((R))
，
，
) Taking the middle value of the numerical range of the speed of the extruder as a numerical point and connecting the numerical point into a line; then a corresponding velocity ratio value nonlinear fitting curve can be obtained, (the dotted line in figure 3) the slope or curvature of the nonlinear fitting curve is calculated and used as the preset standard velocity ratio value.
Further, calculating an actual speed ratio between the extruder and the profiling roll based on said width value, comprising the steps of:
acquiring a real-time adhesive tape width value;
performing quadratic curve fitting on the speed ratio of the extruder and the profiling roller corresponding to the width value of the rubber strip and the fluctuation range of all the width values of the rubber strip in the past in the step S201, and obtaining a relational expression between the width value of the rubber strip and the speed ratio according to a fitting curve;
and calculating the obtained real-time adhesive tape width value according to the speed ratio value relational expression to obtain the actual speed ratio.
According to the steps, when the adhesive tape width value is 15, the corresponding speed ratio is a, when the adhesive tape width value is 16, the corresponding speed ratio is b, and when the adhesive tape width value is 17, the corresponding speed ratio is c; and fitting a quadratic curve again, and obtaining a relational expression between the adhesive tape width value and the speed ratio value according to the fitted curve. Wherein, all the fluctuation ranges of the strip width values are the error ranges allowed by the strip width, for example, when the strip width is 14.95 and 15.05, the corresponding strip width value is 15. And substituting the obtained real-time adhesive tape width value into a speed ratio value relational expression to calculate the actual speed ratio.
S3, adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the standard speed ratio; adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the standard speed ratio; the method comprises the following steps:
s301, searching a preset standard speed ratio corresponding to the real-time adhesive tape width value according to the acquired real-time adhesive tape width value;
s302, comparing an actual speed ratio value obtained by calculation according to the speed ratio value relational expression with a preset standard speed ratio value, wherein the set speed ratio value is the compression roller speed/the extruder speed, and when the actual speed ratio value is larger than the preset standard speed ratio value, keeping the speed of the extruder unchanged and regulating the compression roller speed; when the actual speed ratio value is smaller than the preset standard speed ratio value, keeping the speed of the extruder unchanged, and regulating the speed of the high-pressure compression roller; and when the actual speed ratio value is equal to the preset standard speed ratio value, keeping the speed of the extruder and the speed of the profiling roller unchanged.
And S4, collecting the width value of the adhesive tape again, repeating the steps S2-S3, and realizing the closed-loop control of the width of the adhesive tape.
For example, the width of the rubber strip collected in real time is 15cm, the actual speed ratio calculated according to the speed ratio value relational expression is 3, the preset standard speed ratio corresponding to the width value of the rubber strip of 15cm is searched for and is 2.8, and when the actual speed ratio is greater than the preset standard speed ratio, the speed of the extruder is kept unchanged, and the speed of the low-pressure roller is adjusted. If the actual speed ratio value is equal to the preset standard speed ratio value, keeping the speed of the extruder and the speed of the profiling roller unchanged; and if the actual speed ratio value is larger than the preset standard speed ratio value, keeping the speed of the extruder unchanged, and reducing the speed of the compression roller. In fact, when the adhesive tape is produced, the width of the adhesive tape is certain, the set preset standard speed ratio is a fixed value, and repeated searching is not needed.
As shown in FIG. 2, the invention also provides a closed-loop control device for the width of the adhesive tape, which is used for implementing the control method and comprises a width measuring device, an extruder, a profiling roller and a PLC (programmable logic controller).
The extruder extrudes the rubber material into a rubber body with a certain shape through a mouth-shaped plate through temperature control and screw operation; extruding the rubber material at a constant speed according to a set speed; to facilitate the uniformity of the compound, the extruder is typically set at a relatively constant speed in a zone, so that the extruded strip shape control is achieved by stretching at the speed of the extruder and the profiling rolls.
The compression roller is used for compressing the extruded rubber compound to form the rubber strip.
The width measuring device is used for collecting the width value of the adhesive tape; further, the width measuring device comprises an infrared width measuring sensor and a reflector; the infrared width measuring sensor is used for emitting infrared light, obtaining that an infrared light source is shielded by the rubber strip, and obtaining position pixels reflected on the reflector.
The infrared width measuring sensor used by the width measuring device is actually an infrared linear scanner, and the principle of the infrared width measuring sensor is that an infrared light source emitted by the sensor irradiates a reflector, an adhesive tape material is placed between the sensor and the reflector, and a sensor scanning array receives reflected light for analysis to form a position pixel. The precision main point of the width measuring device is that a side object needs to be relatively static or in a stable state on light perpendicular to a sensor and a reflector, and the sensor, a material and the reflector need to be arranged as required to ensure that the measurement has enough visual angle and accuracy.
Sensor parameters:
power supply: the voltage is 15-28 VDC, and the current < =150 mA; and (3) analog output: 4-20 mA; width measurement range < =150 mm; measuring the distance: 200 mm; resolution ratio: 0.15 mm; the minimum detectable material is 1.2 mm.
During installation, the distance from the sensor to the adhesive tape is set as A, the distance from the adhesive material to the reflector is set as B, and the distance from the sensor to the reflector is set as GAP = A + B. GAP _ MAX = a × 1.2, B _ MAX = a × 0.2, i.e. the optimal B/a ratio is 0.2/1= 1/5.
Assuming that B =40mm, a =5 × 40=200mm, and the maximum range of the reflector is 150mm, X =125 can detect a 125mm object according to 200/240= X/150, but there is a left-right offset of installation, and the actual measurement range is small, generally < 110mm, which can meet the requirement.
The sensor has three modes of edge fixing, centering and width, wherein the width mode is used in the invention, namely MOD =3, and for the convenience of calculation of the pixels of the rubber strip, the mode of 'total black pixels' is used, namely the three lamps of LED3, LEDL and LEDR are in a normally-on mode.
The actual width of the adhesive tape needs to be calibrated before use, a standard thin calibration plate with known width is taken, the upper and lower parts of the calibration plate are in a tangent state with 2 guide rollers, the two sides of the calibration plate are in an effective monitoring range for measuring the width, the width is generally in a range of 60-70 and is close to the width of the adhesive tape, and the calibration accuracy is highest. And calculating the actual real adhesive tape width by the PLC side according to the actually read analog quantity data, wherein the actual real adhesive tape width is used as a main parameter for closed-loop control of the adhesive tape width.
The PLC is used for reading the real-time width value in a time-sharing manner, setting a timing interruption to perform PID calculation, calculating an actual speed ratio between the extruder and the profiling roller, and comparing the obtained actual speed ratio with a preset standard speed ratio; and adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the standard speed ratio.
And for PLC data time-sharing reading, a current mode analog quantity input module is adopted in the PLC to time-share read signals of the width measuring sensor, and the required acquisition time is calculated according to the maximum linear speed (for example, V =100 m/min) of the existing design, the distance between a pressure mode and the sensor (assuming that L =500 mm) and the number of acquisition interval points (assuming that 5 are adopted). That is, the width signal needs to be acquired once within a distance of at least L1= L/5=500/5=100mm, and the acquisition time = L1/V =100/(100 × 1000/60) =0.06s =60ms, that is, the acquisition time interval needs to be less than 60ms to eliminate the influence of the pressure on the execution delay of the sizing material extrusion and the like, and therefore, the AI module acquisition frequency is preferably set to 40-50 ms.
And (3) program timing interruption: because the uncertainty of the PLC execution cycle time, each cycle period can be subject to different complexity of the execution program, and has larger difference, in order to avoid the problem of calling calculation caused by system reasons in operation, a timing interrupt program block is adopted to improve the priority of program calling, when the timing arrives, an adjustment value is calculated and output preferentially to ensure the reliability of the program, and the calculation interval needs to be matched with the module acquisition time, so the timing interrupt time is 40-50 ms.
The method also comprises the following steps of filtering and data calculation processing: for the continuous operation rubber strip, the data collected due to the conditions such as interference of single-point measurement, signal interference and the like exist. The acquired data needs to be filtered, that is, the fluctuation quantity of the width of the rubber strip needs to be calculated as small as possible, so that the mean value of the width measurement data is calculated. As the collection and the program are timed, the time required for calculating the distance L between the pressure and the detection point is used for storing the data value of the effective collection point according to the pressure linear velocity, and the data value is subjected to mean value calculation before the pressure data is calculated, so that a relatively stable adhesive tape width trend value is obtained, and the speed ratio calculation is facilitated.
And (3) data calculation: the input data is processed rubber strip width data, and the velocity ratio of the compression roller and the extruder is calculated by intermittent calling in an interrupt program by using PID (proportion integration differentiation) operation. According to the graph of FIG. 4, the overshoot and the fluctuation are as small as possible by optimizing PID enabling and PID parameters, and the width change of the normal 60-70mm rubber strip is +/-1- +/-2 mm when the extruder is in a constant speed or is gradually changed at a relatively slow speed.
Controlling the profiling extrusion speed ratio: the intermittent speed change of the profiling driving is controlled, so that the width of the rubber strip is influenced, and the closed-loop system comprises periodic collection → control → collection and the width of the stroke rubber strip.
As shown in fig. 2, the adhesive tape measuring device further comprises an adhesive tape guide roller for guiding the adhesive tape to smoothly pass through the width measuring device. Further, the adhesive tape guide roller consists of 2 round rollers which are fixed in parallel up and down; the upper guide roll is arranged at a discharge port of the profiling roll, and the lower guide roll is arranged at the width measuring device. The molding roller is formed by rolling and combining the rubber material through an upper roller and a lower roller according to the required shape; the upper roller is a trapezoidal section roller with a reverse groove, and the lower roller is a plane roller. The adhesive tape is arranged on the two rollers, and due to the stretching effect of the rear part on the adhesive tape, the adhesive tape is in a stretched state on the two rollers, and only has displacement or width change on the left and right, so that the shape change can be truly reflected when the width is measured.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A closed-loop control method for the width of a rubber strip is characterized by comprising the following steps:
s1, acquiring a real-time width value of the adhesive tape;
s2, reading the real-time width value in a time-sharing manner, setting a timing interruption to perform PID calculation, calculating the actual speed ratio between the extruder and the profiling roller, and comparing the obtained actual speed ratio with a preset standard speed ratio; the preset standard speed ratio is calculated by the following steps:
s201, obtaining previous adhesive tape width values and corresponding speeds of an extruder and a profiling roller under each previous adhesive tape width value;
s202, under a certain rubber strip width value, taking the speed of an extruder as a horizontal axis and the speed of a profiling roller as a vertical axis, and drawing a linear fitting curve of the speed ratio of the extruder to the profiling roller according to the speed ratio variation trend of different extruders at different speeds;
s203, setting a fluctuation range according to the width value of the past rubber strip by adopting a PID algorithm, keeping the speed of the profiling roller unchanged, drawing a corresponding speed ratio value nonlinear fitting curve when the speeds of different extruders are different, and obtaining the speed ratio of the extruder and the profiling roller as a preset standard speed ratio;
s3, adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the preset standard speed ratio;
and S4, acquiring the real-time width value of the adhesive tape again, and repeating the steps S2-S3 to realize the closed-loop control of the adhesive tape width.
2. The adhesive tape width closed-loop control method according to claim 1, wherein in step S1, when acquiring the real-time width value of the adhesive tape, the method comprises the following steps:
acquiring position pixels reflected on the reflector when the infrared light source is shielded by the adhesive tape;
and calculating the real-time width value of the rubber strip according to the position pixels.
3. The closed-loop control method for the width of the rubber strip as claimed in claim 1, wherein the step of calculating the actual speed ratio between the extruder and the profiling roll according to the real-time rubber strip width value comprises the following steps:
acquiring a real-time adhesive tape width value;
performing quadratic curve fitting on all the previous rubber strip width values in the S201 and the corresponding speed ratio of the extruder to the profiling roller, and obtaining a relational expression of the rubber strip width values and the speed ratio values according to a fitting curve formed by quadratic curve fitting;
and calculating the obtained real-time adhesive tape width value according to the adhesive tape width value and the speed ratio value relational expression to obtain the actual speed ratio.
4. The closed-loop control method for the width of the rubber strip as claimed in claim 3, wherein the step of adjusting the profiling speed of the profiling roller according to the difference between the actual speed ratio and the standard speed ratio in S3 comprises the following steps:
s301, searching a preset standard speed ratio corresponding to the real-time adhesive tape width value according to the acquired real-time adhesive tape width value;
s302, comparing an actual speed ratio value obtained by calculation according to the speed ratio value relational expression with a preset standard speed ratio value, wherein the set speed ratio value is the compression roller speed/the extruder speed, and when the actual speed ratio value is larger than the preset standard speed ratio value, keeping the speed of the extruder unchanged and regulating the compression roller speed; when the actual speed ratio value is smaller than the preset standard speed ratio value, keeping the speed of the extruder unchanged, and regulating the speed of the high-pressure compression roller; and when the actual speed ratio value is equal to the preset standard speed ratio value, keeping the speed of the extruder and the speed of the profiling roller unchanged.
5. A closed-loop control device for the width of a rubber strip, which is used for implementing the control method of any one of claims 1 to 4, and comprises a width measuring device, an extruder, a profiling roller and a PLC controller;
extruding the rubber material by the extruder at a constant speed according to a set speed;
the compression roller is used for compressing the extruded rubber material to form an adhesive tape;
the width measuring device is used for acquiring the real-time width value of the adhesive tape;
the PLC is used for reading the real-time width value in a time-sharing manner, setting a timing interruption to perform PID calculation, calculating the actual speed ratio between the extruder and the profiling roller, and comparing the obtained actual speed ratio with a preset standard speed ratio value; and adjusting the profiling speed of the profiling roller according to the difference value of the actual speed ratio and the preset standard speed ratio.
6. The adhesive tape width closed-loop control device of claim 5, wherein the width measuring device comprises an infrared width measuring sensor and a reflector; the infrared width measuring sensor is used for emitting infrared light and acquiring position pixels reflected on the reflector when the infrared light source is shielded by the rubber strip.
7. The adhesive tape width closed-loop control device according to claim 5, further comprising an adhesive tape guide roller for guiding the adhesive tape smoothly through the width measuring device.
8. The adhesive tape width closed-loop control device of claim 7, wherein the adhesive tape guide roller consists of 2 round rollers fixed in parallel up and down; the upper guide roll is arranged at a discharge port of the profiling roll, and the lower guide roll is arranged at the width measuring device.
9. The closed-loop control device for the width of the rubber strip as claimed in claim 8, wherein the profiling roller presses the rubber material through an upper roller and a lower roller according to a required shape; the upper roller is a trapezoidal section roller with a reverse groove, and the lower roller is a plane roller.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116222462A (en) * | 2023-05-11 | 2023-06-06 | 天津赛象科技股份有限公司 | Device for detecting cut section of tail end of adhesive |
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