CN117800136A - Tension detection control system and constant tension control method in medical paper production - Google Patents
Tension detection control system and constant tension control method in medical paper production Download PDFInfo
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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
- B65H23/26—Registering, tensioning, smoothing or guiding webs longitudinally by transverse stationary or adjustable bars or rollers
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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
- B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
- B65H26/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
- B65H26/04—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs for variation in 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
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
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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
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/30—Forces; Stresses
- B65H2515/31—Tensile forces
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- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
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Abstract
The invention discloses a tension detection control system and a constant tension control method in medical paper production, raw paper of the system is conveyed to a roll feeding end roller through an unreeling end roller by a paper feeding device, the paper feeding device comprises a raw paper roll, a paper feeding control motor, a gravity pendulum and an angle measuring device, the gravity pendulum comprises a swing arm and a roller pendulum which rotate around a swing shaft, one end of the swing arm is rotationally connected with the unreeling end roller, the roller pendulum is rotationally connected with the other end of the swing arm, the angle measuring device is connected with the gravity swing shaft, and a control module is electrically connected with the paper feeding control motor and the angle measuring device. In the unreeling and conveying process, the gravity pendulum is utilized to measure the gravity pressing angle of the raw paper and the rotating speed of the unreeling device and/or the reeling device is controlled in a feedback manner, so that the unreeling tension of the raw paper is controlled.
Description
Technical Field
The invention belongs to the technical field of medical paper production, and particularly relates to a tension detection control system and a constant tension control method in medical paper production.
Background
The medical multi-layer absorptive fiber reinforced material is a medical consumable material special for operating rooms, and is mainly used for cleaning hands before and after operations of doctors, cleaning liquid in the operations, and wiping and cleaning surgical instruments.
In the medical paper composite production process, the raw material paper is fed and unreeled to keep constant tension (the tension fluctuation range is small), so that the requirements of uniform feeding and ensuring the composite quality (including uniform strength, uniform wrinkles and the like) of the subsequent composite process are met, and the phenomena of breakage (excessive tension), relaxation (excessive tension and easy abnormal winding) and the like of the raw material are also met, so that the continuity of the production process and the product quality are ensured.
In engineering application, general tension control is not separated from tension detection, traditional tension detection is connected in series on a transmission device in the generation direction of tension of a detected raw material through a special tension detector, such as a winding/unwinding roller shaft or a chest expander, and the like, and typical application is disclosed in China patent with publication number of CN114486041A, a cloth tension detection system for textile production, publication number of CN111220457A, a cloth tension detection grading device and the like. The design is easy to cause complicated structure and difficult fault maintenance of the transmission device, and especially the medical paper composite applied to the transmission device has high requirement on the force control precision of raw paper, and the traditional method is not convenient and practical.
Disclosure of Invention
Aiming at the problems, the invention designs a constant tension control method in the production of medical paper, and the constant tension control on the feeding of raw paper can be realized by tilting a gravity roller at a fixed angle and controlling the feeding unreeling speed by angle measurement feedback.
The invention relates to a constant tension control method in medical paper production, which is characterized in that raw paper is sequentially conveyed to a backward device through an unreeling end roller and a feeding end roller by a paper feeding device, and the method is characterized in that the measurement of gravity compression angle of the raw paper by a gravity pendulum and the feedback control of the rotation speed of the unreeling device and/or a reeling device are utilized in the unreeling conveying process, so as to achieve the purpose of controlling unreeling tension of the raw paper, the gravity pendulum comprises a swing arm and a roller pendulum which can rotate around a swing shaft, the swing arm is parallel to the raw paper when the raw paper at two sides of the roller pendulum is not deformed by pressing down, and the constant tension control method mainly means that the raw paper is kept in a constant tension state in the feeding unreeling process, so that the quality of the medical paper in compounding is ensured, and the generation of unbalance and deformation of compound stress is avoided, and comprises a swing angle control method:
the said method is recordedSwing arm length d of gravity pendulum 1 Equivalent weight g (the equivalent weight comprises equivalent swing arm gravity and swing gravity), and the unreeling angle theta of the raw paper during gravity-free swing 1 (for ease of calculation expression is defined as the angle between the feeding direction and the vertical axis perpendicular to the horizontal plane), the unreeling motor speed V r (rpm), line speed V x The initial diameter d of the raw material paper roll (unit mm/s), the accumulated unreeling number of turns (motor rotation number) n, the thickness h of the raw material paper (unit mm), and the gravity pendulum setting swing angle theta 0 Actual measurement of the swing angle θ x ，θ 0 <θ 1 The method comprises the steps of carrying out a first treatment on the surface of the Radius r of roller pendulum 1 The radius of the unreeling end roller and the reeling end roller is r 2 The method comprises the steps of carrying out a first treatment on the surface of the The distance between the swinging shaft and the roller shaft at the feeding end is c;
when the actual measurement swing angle is theta x In the swing angle control method, the actual length b of the raw paper between the rollers at the two sides of the gravity pendulum is controlled by the speed change of the unreeling end or the reeling end x The control of the target swing angle is realized;
according to the corresponding gravity pendulum, the pendulum angle theta is actually measured x Recording
d x ＝d 1 -(r 1 +r 2 )ctg(θ x )
d x In fact, the swing angle theta x The lower roller is swung to the length of the raw paper between the unreeling end rollers, then the measured length of the raw paper between the unreeling end rollers and the reeling end rollers at the two sides of the roller pendulum and b x In order to achieve this, the first and second,
fixed swing angle theta corresponding to gravity decoration 0 Ideal length b of raw paper between rollers at two sides of roller pendulum 0 In order to achieve this, the first and second,
wherein d is 0 ＝d 1 -(r 1 +r 2 )ctg(θ 0 )
Note Δb=b x -b 0 Then when theta x And theta 0 Deviation occurs, and the system automatically measures theta according to actual measurement x Calculating Δb and then based on
Δb＝ΔV x * Δt (equation 1)
Determining a speed adjustment amount DeltaV of a motor x And adjusting the duration Δt; when the unreeling end is adjusted, deltaV x When the feeding end is adjusted, deltaV is opposite to Deltab x The same sign as Δb.
Further, the speed adjustment amount DeltaV x And the determination method of the adjustment duration Δt includes a fixed time interval method or a fixed speed adjustment amount method;
the fixed time interval method presets a fixed value for the adjustment duration deltat, so that the speed adjustment quantity can be calculated according to the formula 1;
here DeltaV x The linear velocity is converted into the rotational velocity DeltaV r Realize the regulation to inverter motor:
ΔV r ＝60ΔV x /(d-2nh)/π
the fixed speed regulation method fixes the speed variation to a fixed amount DeltaV r Or DeltaV r If the fixed amount is DeltaV r To be converted into a linear velocity adjustment quantity DeltaV x ，
ΔV x ＝ΔV r (d-2nh)π/60
The time Δt for which the adjustment is to be maintained is then calculated by equation 1.
Further, the swing angle adjusting strategy of the swing angle control method comprises a real-time adjusting strategy or a threshold adjusting strategy; the real-time adjustment strategy comprises the following steps of according to the measured swing angle theta x Calculating delta b in real time and determining the speed adjustment quantity delta V of the motor in real time x And adjusting the duration Δt in real time; the threshold adjustment strategy includes, when θ x And theta 0 Absolute value of deviation exceeds threshold delta theta max And when the motor is started to regulate.
Further, the method for actually measuring the swing angle comprises a method for real-time measurement by using an axial angle encoder.
In another aspect, a system for controlling tension in the production of medical paper is characterized in that the system implements the method for controlling constant tension in the production of medical paper according to any one of claims 1 to 4.
In still another aspect, a tension detection control system in medical paper production, the system includes paper feeding device, unreels end cylinder, send a roll end cylinder and control module at least, and raw materials paper is passed through unreels end cylinder by paper feeding device and is sent a roll end cylinder, paper feeding device includes raw materials scroll and paper feed control motor, its characterized in that, the system still includes gravity pendulum and angle measurement device, gravity pendulum includes swing arm and the cylinder pendulum that can rotate around the swing axis, the one end and unreels end cylinder swivelling joint of swing arm, the cylinder pendulum is connected with the other end swivelling joint of swing arm, angle measurement device is connected with the swing angle of gravity swing axis, measurable swing arm's swing angle, control module is connected with paper feed control motor, angle measurement device electricity. The system can perform any of the above-described constant tension control methods in the production of medical paper.
Further, the gravity pendulum is fixedly connected with the unreeling end drum shaft through a vertical supporting rod, or is directly connected with the unreeling end drum shaft and swings around the shaft.
Further, the angle measuring device comprises a rotary transformer or a photoelectric encoder.
Further, a control motor is arranged at the roll feeding end and is electrically connected with the control module.
The invention has the advantages and beneficial effects that: according to the tension detection control system and the constant tension control method in the medical paper production, tension is applied to raw paper through gravity pendulum, tension is detected through swing angle measurement, and tension is controlled through swing angle, and the essential characteristics are that tension detection and control are integrated into a whole, so that the accurate control of tension in the multi-layer paper compounding process is realized, the phenomenon of overlarge or overlarge tension is not easy to occur, and the compounded medical paper product is small in deformation, uniform in wrinkling, fluffy in texture and good in texture, and has great significance for continuous compounding production of medical paper. The system and method of the invention are also advantageous in that the reserved length adjustment of the paper is adjusted by micro-adjustmentThe tension is saved, the phenomenon of over-regulation or under-regulation is avoided, and the phenomenon of paper breakage caused by excessive tension is avoided; furthermore, even if the tracking adjustment is not in place once because the elastic deformation of the sheet is not considered, the adjustment once according to the calculated Δb may not satisfy θ x ＝θ 0 But because the present invention is an error tracking adjustment, the system can be continuously fine tuned without causing significant oscillations.
Drawings
FIG. 1 is a schematic diagram of the principle of a tension detection control system in the production of medical paper when gravity pendulum has no gravity effect;
FIG. 2 is a schematic diagram of the principle of the tension detection control system in the production of medical paper when gravity is exerted on the tension detection control system;
fig. 3 is a schematic diagram of a tension detection control system in medical paper production in which a swing shaft is coaxial with an unreeling end drum shaft.
The marks in the figure:
the paper feeding device 1, raw paper 2, an unreeling end roller 3, a supporting rod 4, a swinging shaft 5, a swinging arm 6, a roller pendulum 7 and a reeling end roller 8.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
As shown in figure 1, according to the constant tension control method in the medical paper production, raw paper 2 is conveyed to a follow-up device by a paper feeding device 1 sequentially through an unreeling end roller 3 and a feeding end roller 8, the gravity compression angle of the raw paper is measured by a gravity pendulum in the unreeling conveying process, and the rotating speed of the unreeling device and/or a reeling device is controlled in a feedback manner, so that the unreeling tension of the raw paper is controlled, the gravity pendulum comprises a swing arm 6 and a roller pendulum 7 which can rotate around a swing shaft 5, the swing arm 6 is parallel to the raw paper when the raw paper 2 at two sides of the roller pendulum 7 is not deformed by pressing, namely, the gravity effect is not considered, and the vertical distance between the center line of the swing arm 6 and the surfaces of the raw paper 2 at two sides of the roller pendulum 7 is equal to the radius of the roller pendulum (as shown in figure 1); the supporting rod 4 is fixedly connected with the rotary shaft of the unreeling end roller 3, one end of the swing arm 6 is rotatable around a swing shaft on the supporting rod 4, the roller pendulum 7 is rotatable around a rolling shaft on the other end of the swing arm 6, the roller pendulum is an auxiliary tension applying (controlling) device and a tension testing device (tension is measured through a swing angle, and the swing angle measurement can be completed through a mature angle measuring sensor such as a photoelectric encoder or a rotary transformer, etc.), the constant tension control method mainly means that raw paper is kept in a constant tension state in the feeding unreeling process so as to ensure the quality of medical paper during compounding, avoid unbalance and deformation of compound stress, and comprises a swing angle control method:
recording the swing arm length d of the gravity pendulum 1 Equivalent weight g (the equivalent weight comprises equivalent swing arm gravity and swing gravity), and the unreeling angle theta of the raw paper during gravity-free swing 1 (original angle when not influenced by gravity pendulum, for the sake of calculation expression definition is the included angle of the feeding direction and the vertical axis, which is perpendicular to the horizontal plane), unreeling motor rotation speed V r (rpm), line speed V x (unit mm/s), the gravity pendulum sets the pendulum angle θ 0 (corresponding to the preset ideal compound tension, can be obtained directly through experiments or can be obtained through experimental verification after theoretical calculation), and the actual measured swing angle theta x ，θ 0 <θ 1 The method comprises the steps of carrying out a first treatment on the surface of the Radius r of roller pendulum 1 The radius of the unreeling end roller and the reeling end roller is r 2 This embodiment r 1 ＝r 2 The method comprises the steps of carrying out a first treatment on the surface of the The distance between the swinging shaft and the roller shaft at the feeding end is c; the length units are consistent, the embodiment adopts the radian of mm and the angle units, so that the arc length is convenient to calculate, the angle is sometimes expressed by the custom degree, and the radian is uniformly converted during calculation;
the set swing angles are in one-to-one correspondence with preset tension, and ideal medical paper composite feeding gravity swing angles are obtained through calculation or test according to the preset raw paper tension; because the raw paper is under different tension under different swing angles, the relationship between tension and swing angle is not needed to be calculated strictly in principle, only an appropriate swing angle is needed to be tested, and the swing angle is used as a control reference when the swing angle theta is actually measured x Exceeding theta 0 Or when a certain limit is exceeded, control theta x Reduced to theta 0 Nearby, when the swing angle θ is measured x Below theta 0 Or below a certain limit, control theta x Increased to theta 0 A vicinity; of course, according to the relation theory of the swing angle and the tension, the tension corresponding to the swing angle is calculated or experimentally measured, so that the adjustment of test parameters can be better guided, especially, in consideration of different friction force influences caused by different speeds, in the actual swing angle control adjustment, adjustment factors of influences of the linear speed, the friction force and the like of additional raw material paper can be considered, and the accuracy and the actual effect of swing angle control are better; under the action of gravity pendulum, if theta x Infinite approach theta 1 When the tension of the raw paper becomes infinite, the situation of the gravity pendulum is not possible to happen in fact, and the situation is theta x When a certain angle is reached (not reached θ 1 Front) the raw paper will break naturally.
The change of the swing angle inevitably causes the change of the length of the raw paper between the two tangent points of the unreeling end roller and the reeling end roller, and the swing angle can be naturally changed by adjusting the length; under the condition that the raw paper speeds of the unreeling end and the reeling end are balanced, the length of the raw paper between the unreeling end and the reeling end can be changed only by short-time change of the paper feeding speed of one or both sides. The principle of the invention is to calculate the length to be regulated of the raw paper at the unreeling end and the feeding end according to the swing angle regulation requirement, and accurately regulate the variation quantity and/or the variation duration of the paper feeding speed, thereby realizing the constant tension control in the medical paper composite production.
Regarding the principle and method of controlling the swing angle, as shown in FIG. 2, when the actually measured swing angle is θ x In the swing angle control method, the actual length b of the raw paper between the rollers at the two sides of the gravity pendulum is controlled by the speed change of the unreeling end or the reeling end x (unit mm) to control the target swing angle;
taking unreeling end adjustment as an example, the swing angle theta is actually measured according to the corresponding gravity pendulum x Recording
d x ＝d 1 -(r 1 +r 2 )ctg(θ x )
d x In fact, the swing angle theta x The lower roller swings to the unreeling end rollerThe length of the raw paper is measured between the unreeling end roller and the reeling end roller at the two sides of the roller pendulum and b x In order to achieve this, the first and second,
fixed swing angle theta corresponding to gravity decoration 0 Ideal length b of raw paper between rollers at two sides of roller pendulum 0 In order to achieve this, the first and second,
wherein d is 0 ＝d 1 -(r 1 +r 2 )ctg(θ 0 )
Theta is then x ＝θ 1 During the process, the straight line length b of the raw paper between the rollers at the two sides of the gravity pendulum 0 The contact point of the roller pendulum 7 and the non-deformation part of the raw material paper is at a distance b from the unreeling end roller 3 1 At a distance b from the nearest feed end drum 8 2 Can be calculated according to the principle, wherein b 0 ＝b 1+ b 2 The method comprises the steps of carrying out a first treatment on the surface of the And has
r 1 +r 2 ＝(d 1 -b 1 )tg(θ 1 )
Note Δb=b x -b 0 Then when theta x And theta 0 Deviation occurs, and the system automatically measures theta according to actual measurement x Calculating Δb and then based on
Δb＝-ΔV x * Δt (equation 1)
Determining the speed regulation DeltaV of the unreeling motor x And adjusting the duration Δt.
Note that unreeling end adjusts Δv x Opposite sign to Δb, i.e. when θ x <θ 0 Time b x >b 0 ，Δb>0, then there is DeltaV x <0, namely, the actually measured swing angle is smaller, raw paper on two sides of a gravity pendulum needs to be tightened, so that the unreeling motor is required to run at a short time in a decelerating way under the condition that the speed of the reeling end is unchanged, and the purpose of tightening can be achieved; when theta is as x >θ 0 Time b x <b 0 ，Δb<0, then there is DeltaV x >0, that is to say, the measured swing angle is partial, the raw paper on two sides of the gravity pendulum needs to be loosened a bit, so that the unreeling motor is accelerated to run for a short time under the condition that the speed of the reeling end is unchanged, and the purpose of loosening can be achieved.
When the motor for feeding or winding is mainly regulated, the speed regulating quantity DeltaV of the motor x Consistent with the adjustment duration Δt determination method, except for ΔV x Opposite sign of (i.e. equation 1 changes to Δb=Δv) x * The speed regulating quantity symbol of the delta t, the roll feeding end or the roll-up motor is consistent with the delta b symbol.
In the embodiment, the radius of the unreeling end roller, the reeling end roller and the roller swing are consistent, namely r 1 ＝r 2 At this time b 0 And b x The calculation formula of (2) can be simplified; when the linear speeds are considered to be different, the friction force between the raw paper and the roller is slightly changed, so that the actual adjusting effect of the swing angle is also affected, and the speed adjusting amount is required to be corrected by more accurate calculation; i.e. in actual engineering it is also possible to work with Δb or directly with ΔV x Carrying out additional adjustment quantity correction, wherein the specific correction quantity is a small quantity and can be obtained according to a test; additional adjustment test methods, e.g. artificial theta x Deviation occurs and the ideal correction (i.e. the sum of calculated correction and additional adjustment) should be such that θ x At most once, the oscillation converges to theta quickly (within 20s, for example) 0 。
Preferably, the speed adjustment amount Δv x And the determination method of the adjustment duration Δt includes a fixed time interval method or a fixed speed adjustment amount method;
in the embodiment, a fixed time interval method is adopted, and in actual engineering application, under the condition of small speed variation, the faster and better the system is stabilized, namely the shorter the adjusting time is, the better the adjusting time is; because the implementation design is all fine-tuning in real time, the angle change amount is not large, and the speed adjustment amount is not large, a fixed value is preset for the adjustment duration deltat, such as 1s or 2s, and the like, and the adjustment duration deltat is generally controlled within 10s, and can be specifically redetermined according to the speed adjustment amount obtained by calculation later, the pulsation characteristic of the system is obvious due to the overlarge speed adjustment amount, and in fact, the situation cannot occur in engineering application because the fine-tuning is continuously performed; thus, the speed adjustment can be calculated according to the formula 1;
here DeltaV x The linear velocity is converted into the rotational velocity DeltaV r Realize the regulation to inverter motor:
ΔV r ＝60ΔV x /(d-2nh)/π
wherein, the initial diameter d of the raw material paper roll, the accumulated unreeling number of turns (the number of turns of a motor) n and the thickness h (unit mm) of the raw material paper.
Preferably, the swing angle adjusting strategy of the swing angle control method adopts a real-time adjusting strategy, namely according to the measured swing angle theta x Calculating delta b in real time and determining the speed adjustment quantity delta V of the motor in real time x And adjusting the duration Δt in real time.
Preferably, the method for actually measuring the swing angle includes a method for real-time measurement by using an axial angle encoder, wherein the axial angle encoder comprises a rotary transformer or a photoelectric encoder.
The gravity pendulum of the invention sets a pendulum angle theta 0 Generally, for a certain determined paper feeding speed (balance speed) of a production line, a better swing angle, namely a better tension, is obtained through a test; since the tension changes at the same swing angle due to different influences of the additional tension at different speeds, such as different influences of friction force between the paper and the drum, and the composite quality of the medical paper is also affected, it is sometimes necessary to re-test and adjust the set swing angle.
The embodiment realizes the constant tension control of the raw paper between the unreeling end roller and the reeling end roller, and for a feeding unreeling system in the medical paper production, the raw paper is mainly conveyed through various rollers at the rear end of the reeling end roller until a compound link is reached, which is equivalent to realizing the constant tension control of the whole conveying link of the raw paper.
The embodiment theta 1 ＝45°，θ 0 ＝15°，d 1 ＝250mm，r 1 ＝r 2 =50mm, d=1200 mm, h=0.045 mm, n is the actual count result.
Example 2
The difference from embodiment 1 is that the speed adjustment amount Δv is as follows x And a determination method for adjusting the duration Δt, in which the speed variation is fixed at a certain fixed amount Δv by a fixed speed adjustment method r Or DeltaV r If the fixed amount is DeltaV r For example, 2 rpm or 5 rpm, is converted into a linear velocity adjustment amount DeltaV x ，
ΔV x ＝ΔV r (d-2nh)π/60
The time Δt for which the adjustment is to be maintained is then calculated by equation 1.
Example 3
The difference from embodiment 1 is that the swing angle adjustment strategy of the swing angle control method adopts a threshold adjustment strategy, namely, when θ x And theta 0 Absolute value of deviation exceeds threshold delta theta max When the motor is started to adjust, the upper limit and the lower limit can be respectively set with the same method and principle, the specific adjustment amount is calculated by referring to a fixed time interval method or a fixed speed adjustment amount method, the difference between the specific adjustment amount and a real-time adjustment strategy is that the time for starting the speed adjustment of the variable frequency motor is different, one is always in micro adjustment, and the adjustment is started after the other exceeds a certain threshold, so that the variable frequency motor belongs to irregular adjustment; it should be noted that the threshold value should not be too large when implementing the threshold adjustment strategy, otherwise significant ripple oscillations may occur.
In this embodiment, since the raw paper reaches the compounding and winding end from the unwinding end through the middle several sections of conveying rollers, only the rotation speed of the unwinding motor is adjusted, and the swing angle deviation threshold Δθ is preset in this embodiment max ＝0.5°。
Example 4
A system for controlling tension in medical paper production, the system implementing the method for controlling constant tension in medical paper production according to any one of embodiments 1 to 3 and possible combinations thereof.
Example 5
The system comprises a paper feeding device 1, an unreeling end roller 3, a feeding end roller 8 and a control module (not shown in the figure), wherein raw paper 2 is conveyed to the feeding end roller through the unreeling end roller by the paper feeding device, the paper feeding device comprises a raw paper roll and a paper feeding control motor (mature technology, not shown in the figure), the system further comprises a gravity pendulum and an angle measuring device (mature technology, not shown in the figure), the gravity pendulum comprises a swinging arm 6 and a roller pendulum 7 which can rotate around a swinging shaft 5, one end of the swinging arm is rotatably connected with the unreeling end roller, the roller pendulum is rotatably connected with the other end of the swinging arm, the angle measuring device is connected with the gravity swinging shaft 5 (not shown in the figure), the swinging angle of the swinging arm is measured, the control module is electrically connected with the paper feeding control motor and the angle measuring device, the tension is applied to raw paper between the unreeling end roller and the feeding end roller by the gravity pendulum, the control system realizes constant control of the length of the raw paper between the unreeling end roller and the feeding end roller by controlling the swinging angle of the swinging motor and the paper feeding end of the swinging end roller; for a feeding unreeling system in the production of medical paper, as the raw paper is mainly conveyed through various rollers at the rear end of a roller at a reeling end until a compound link is achieved, the raw paper between the unreeling end roller and the roller at the reeling end realizes constant tension, which is equivalent to constant tension in the whole conveying link of the raw paper.
The system can be directly applied to the constant tension control method in the production of the medical paper in any one of the embodiments 1 to 3.
Preferably, the gravity pendulum is fixedly connected with the unreeling end drum shaft through a vertical supporting rod 4 (shown in fig. 1 and 2).
Preferably, the angular device comprises a rotary transformer or a photoelectric encoder.
Preferably, the feeding end is provided with a control motor (not shown in the figures) electrically connected to the control module (not shown in the figures, the control motor does not have to be connected to the feeding end roller, and it may be provided on the subsequent feeding or winding device).
The general paper feeding device is provided with a controllable rotating motor, and the controllable rotating motor is matched with the angle measuring device to realize the constant tension control on the feeding of the raw paper; the control motor of the feeding or winding device is arranged, and the constant tension control on the feeding of the raw paper can be realized by matching with the angle measuring device; or the paper feeding control motor, the paper feeding or winding device control motor and the angle measuring device are matched to realize the constant tension control on the feeding of the raw paper, and the control method is different, and the effect is different.
Example 6
The difference from example 5 is that the gravity pendulum is directly connected to the unwind-end drum shaft and swings around this shaft (the system connection principle is shown in fig. 3).
The tension detection control system and the constant tension control method in the production of the medical paper are focused on solving the constant tension problem of the unreeling end, and are realized by tightening or loosening the conveying amount of the raw paper, and when the production line is simpler, the system is only needed. When the number of the transmission links from the coil feeding to the composite intermediate is more, the balance of the coil unreeling, the coil reeling and the material storing of the whole system can be controlled by adding another set of circulating detection and control system, and finally, the coil unreeling balance and the constant tension control of the whole production line are realized by resultant force, so that the system can stably operate.
The basic principle of the invention is as follows: the system synchronously realizes tension measurement and control of raw paper in medical paper production by utilizing gravity pendulum, and mainly realizes measurement and control of a pendulum angle. The final aim of the invention is to change the tension of the raw paper by adjusting the transmission quantity of the raw paper at two sides of the gravity pendulum, under the condition of balanced winding and unwinding speeds, the transmission quantity of the raw paper at two sides of the gravity pendulum can be changed by changing the winding and unwinding speeds for a short time (when the winding and unwinding speeds are changed simultaneously, the two variable quantities are different, the process is generally not performed in the process, and only one side of the process needs to be changed). Specifically, the length of the raw paper between the unreeling end roller and the feeding end roller is adjusted through short-time speed change of unreeling or reeling of the raw paper, so that the swing angle is controlled and adjusted, the swing angle is enabled to track a constant target angle, and the constant tension control of the raw paper between the unreeling end roller and the feeding end roller is realized; because the raw material paper is mainly conveyed through various rollers at the rear end of the roller at the feeding end, the whole conveying composite link is equal to constant tension.
The above-mentioned embodiments are only some of the embodiments of the system and method for detecting and controlling tension in the production of medical paper with a relatively comprehensive system, and because the two factors of speed change and duration jointly meet the requirement of the raw paper on the transmission change Δb of the raw paper on both sides of the gravity pendulum, there are various combined adjustment strategies, such as determining the speed adjustment Δv of the motor x And a fixed time interval method or a fixed speed adjustment method for adjusting the duration deltat, wherein the swing angle adjustment strategy of the swing angle control method comprises a real-time adjustment strategy or a threshold adjustment strategy and the like which can be combined in a crossing way, b x And b 0 The calculation of (a) can adopt an approximate calculation strategy and the like; on the other hand, for the tension detection control system in the medical paper production, the change of the angle measuring device, the change of the roller structure, the change of the relative position relation and the like can be regarded as the protection scope of the invention as long as the basic principle and the application are the same or similar to the invention; furthermore, although the invention is developed for application in medical paper composite production, the invention is practically applicable to the composite of other sheet-like soft materials such as paper, cloth, film and the like. Such combinations or preferred embodiments or applications are also considered to be within the scope of the invention and are not listed here.
Claims (9)
1. The utility model provides a constant tension control method in medical paper production, raw materials paper is carried to the back device by paper feeding device through unreeling end cylinder, feed end cylinder in proper order, and characterized in that utilizes gravity pendulum to the measurement of raw materials paper gravity oppression angle and feedback control unreeling device and/or coiling mechanism's rotational speed in unreeling transportation process, reaches the purpose of controlling raw materials paper unreeling tension, gravity pendulum includes swing arm and the cylinder pendulum of rotatory around the swing axis, the swing arm is parallel with raw materials paper when cylinder pendulum both sides raw materials paper does not push down the deformation, constant tension control method includes the swing angle control method:
the swing angle control method controls the actual length b of the raw paper between the rollers at the two sides of the gravity swing through the speed change of the unreeling end or the reeling end x And gravity setting fixed swing angle theta 0 Corresponding raw paper length b 0 Is realized to target by the difference value of (2)Controlling the swing angle;
note Δb=b x -b 0 When gravity pendulum actually measures the pendulum angle theta x And theta 0 Deviation occurs, and the system automatically measures theta according to actual measurement x Calculating Δb from
Δb＝ΔV x * Δt (equation 1)
Determining a speed adjustment amount DeltaV of a motor x And adjusting the duration Δt; when the unreeling end is adjusted, deltaV x When the feeding end is adjusted, deltaV is opposite to Deltab x The same sign as Δb.
2. The method for controlling constant tension in medical paper production according to claim 1, wherein b x And b 0 The method comprises measuring the swing angle theta according to the corresponding gravity pendulum x ，
Recording the swing arm length d of the gravity pendulum 1 Unreeling angle theta of raw paper during gravity-free swing 1 Unreeling motor rotating speed V r Linear velocity V x The initial diameter d of the raw material paper roll, the accumulated unreeling number n, the thickness h of the raw material paper and the gravity pendulum set the swing angle theta 0 Actual measurement of the swing angle θ x ，θ 0 <θ 1 The method comprises the steps of carrying out a first treatment on the surface of the Radius r of roller pendulum 1 The radius of the unreeling end roller and the reeling end roller is r 2 The method comprises the steps of carrying out a first treatment on the surface of the The distance between the swinging shaft and the roller shaft at the feeding end is c;
d x ＝d 1 -(r 1 +r 2 )ctg(θ x )
the measured length and b of the raw paper between the unreeling end roller and the reeling end roller at the two sides of the roller pendulum x In order to achieve this, the first and second,
fixed swing angle theta corresponding to gravity decoration 0 Ideal length b of raw paper between rollers at two sides of roller pendulum 0 In order to achieve this, the first and second,
wherein d is 0 ＝d 1 -(r 1 +r 2 )ctg(θ 0 )。
3. The method for controlling constant tension in medical paper production according to claim 2, wherein the speed adjustment amount Δv x And the determination method of the adjustment duration Δt includes a fixed time interval method or a fixed speed adjustment amount method;
the fixed time interval method is used for presetting a fixed value for the adjustment duration deltat and calculating the speed adjustment quantity according to a formula 1;
the fixed speed regulation method fixes the speed variation to a fixed amount DeltaV r Or DeltaV r If the fixed amount is DeltaV r To be converted into a linear velocity adjustment quantity DeltaV x ，
ΔV x ＝ΔV r (d-2nh)π/60
The time Δt for which the adjustment is to be maintained is then calculated by equation 1.
4. A method of constant tension control in medical paper production according to claim 3, wherein the swing angle adjustment strategy of the swing angle control method comprises a real-time adjustment strategy or a threshold adjustment strategy; the real-time adjustment strategy comprises the following steps of according to the measured swing angle theta x Calculating delta b in real time and determining the speed adjustment quantity delta V of the motor in real time x And adjusting the duration Δt in real time; the threshold adjustment strategy includes, when θ x And theta 0 Absolute value of deviation exceeds threshold delta theta max And when the motor is started to regulate.
5. The method for controlling constant tension in medical paper production according to claim 1, wherein the method for actually measuring the swing angle comprises a method for real-time measurement by using an axial angle encoder.
6. The utility model provides a tension detection control system in medical paper production, the system includes paper feeding device, unreels end cylinder, feed end cylinder and control module at least, and raw materials paper is passed to feed end cylinder by paper feeding device through unreeling end cylinder, paper feeding device includes raw materials scroll and paper feed control motor, its characterized in that, the system still includes gravity pendulum and angle measurement device, gravity pendulum includes rotatory swing arm and the cylinder pendulum around the swing axis, the one end and the unreeling end cylinder swivelling joint of swing arm, the other end swivelling joint of cylinder pendulum and swing arm, angle measurement device is connected with gravity pendulum swing axis, control module is connected with paper feed control motor, angle measurement device electricity.
7. The tension detecting and controlling system for medical paper production according to claim 6, wherein the gravity pendulum is fixedly connected with the unreeling end drum shaft through a vertical supporting rod, or directly connected with the unreeling end drum shaft and swings around the shaft.
8. The tension detection control system in medical paper production according to claim 6, wherein the angle measuring device comprises a rotary transformer or a photoelectric encoder.
9. The tension testing control system for medical paper production according to claim 6, wherein the roll feeding end is provided with a control motor, and the control motor is electrically connected with the control module.
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