CN111114910B - Heat sealing method of bubble cap machine - Google Patents
Heat sealing method of bubble cap machine Download PDFInfo
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- CN111114910B CN111114910B CN201811291664.2A CN201811291664A CN111114910B CN 111114910 B CN111114910 B CN 111114910B CN 201811291664 A CN201811291664 A CN 201811291664A CN 111114910 B CN111114910 B CN 111114910B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
- B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
Abstract
The invention provides a heat sealing method of a bubble cap machine, in the bubble cap machine, a forming film enters a heat sealing mechanism from a forming mechanism, and a covering film enters the heat sealing mechanism from a covering film unreeling mechanism, so that the covering film covers the surface of the forming film at a heat sealing roller; in order to realize the constant tension control of the covering film, the heat sealing method of the bubble cap machine utilizes the servo feedback of the heat sealing roller, calculates the diameter of the unwinding roller of the current covering film according to the rotating arc length of the heat sealing roller and the rotating central angle of the covering film shaft, and calculates the driving torque of the covering film shaft according to the diameter of the unwinding roller of the current covering film shaft, thereby realizing the whole-process constant tension control of the covering film in the heat sealing process of the bubble cap machine, further greatly improving the tension stability of the covering film in the heat sealing process of the covering film and the forming film, improving the sealing performance of the final product and improving the production yield of the product.
Description
Technical Field
The invention relates to the technical field of bubble cap machines, in particular to a heat sealing method of a bubble cap machine.
Background
Aluminum-plastic blister packaging is a main product packaging mode in the pharmaceutical machine industry at present, and most of tablet finished medicines can be sold in the market as products only after the process. The working process is to pack various tablets on an aluminum plastic plate by PVC molding, and the tablet is suitable for tablets, capsules, plain tablets and various irregular tablets with various specifications. In order to realize high-speed packaging of tablets with different sizes and shapes, a control system is required to have a high-speed, accurate and coordinated control function.
The flat plate type automatic blister packaging machine is used for packaging packages, PVC sheet materials are heated through an upper heating plate and a lower heating plate at first, then pressure is generated through compressed air, the products are formed according to the size of a mold, the formed blisters are placed in the products, the products are pulled backwards through pneumatic traction at the rear part and enter a heat sealing area of an aluminum-plastic composite film, an aluminum film (PTP film) and a PVC film are bonded around the blisters through certain pressure and temperature, the products are sealed, and continuous packages are cut through a blanking station.
The aluminum film tension is basically constant in the process of heat sealing of the aluminum-plastic composite film, and the aluminum film pattern points are aligned with the formed PVC packing material. The constant tension of the aluminum film can ensure that the aluminum film and the PVC film are tightly sealed, and the heat-sealing embossing is beautiful. If the tension of the aluminum film is too high, the film is likely to be broken or the sealing property is poor. If the tension of the aluminum film is too low, problems such as sealing wrinkles and easy ventilation are likely to occur, so that the quality guarantee period is affected or the aluminum film is determined to be unqualified.
In the existing scheme, most tension swing rods and magnetic powder brakes are used for controlling the constant tension, and the scheme has poor tension stability and cannot realize the register function.
Disclosure of Invention
The invention aims to provide a heat sealing method of a bubble cap machine, so that the constant tension of a covering film is realized when the covering film and a forming film are subjected to heat sealing, and the stability of the tension is greatly improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.
According to a first aspect of the invention, a heat sealing method of a bubble cap machine is provided, the bubble cap machine comprises a forming mechanism, a heat sealing mechanism and a covering film unreeling mechanism, the heat sealing mechanism comprises a heat sealing roller and a heat sealing roller driving motor, the covering film unreeling mechanism comprises a covering film shaft and a covering film shaft driving motor, a forming film enters the heat sealing mechanism from the forming mechanism, and a covering film enters the heat sealing mechanism from the covering film unreeling mechanism, so that the covering film covers the surface of the forming film at the heat sealing roller;
the method comprises the following steps:
acquiring a rotation central angle of the heat seal roller in a measurement period, and calculating the rotation arc length of the heat seal roller in the measurement period by combining the radius of the heat seal roller;
obtaining the arc length of the covering film shaft rotating in the measuring period according to the arc length of the heat seal roller rotating in the measuring period;
acquiring a rotation central angle of the covering film shaft in a measurement period, and calculating the current radius of the covering film shaft by combining the arc length of the covering film shaft rotating in the measurement period;
calculating the driving torque of the covering film shaft according to the preset covering film tension and the current radius of the covering film shaft;
and controlling the operation of the covering film shaft driving motor according to the driving torque of the covering film shaft.
Optionally, the arc length of the heat seal roll rotating during the measurement period is calculated according to the following formula:
L1＝a1*R1
wherein L1 is the arc length of the heat seal roller rotating in the measuring period, a1 is the rotation central angle of the heat seal roller in the measuring period, and R1 is the radius of the heat seal roller.
Optionally, the arc length of the heat seal roller rotating in the measuring period is used as the arc length of the covering film shaft rotating in the measuring period;
calculating the current radius of the shaft of the cover film according to the following formula:
R2＝L1/a2
wherein L1 is the arc length of the heat seal roller rotating in the measuring period, a2 is the rotating central angle of the covering film shaft in the measuring period, and R2 is the current radius of the covering film shaft.
Optionally, the driving torque of the mantle shaft is calculated according to the following formula:
Fθ＝F1*R2
wherein, F theta is the driving torque of the covering film shaft, F1 is the preset covering film tension, and R2 is the current radius of the covering film shaft.
Optionally, a plurality of color patches with known positions are arranged on the covering film at preset positions, and an image acquisition device is arranged between the covering film shaft and the heat sealing roller and used for acquiring color patch images of the covering film;
the method further comprises the steps of:
calculating the length L2 of the cover film entering the heat sealing mechanism in the measuring period according to the time when the color mark image is acquired by the image acquisition device and the known position of the color mark;
comparing the arc length of the heat-sealing roller rotating in the measuring period L1 with the length of the cover film entering the heat-sealing mechanism in the measuring period L2;
calculating a difference Δ L between an arc length L1 and a length L2, and adjusting a driving torque of the film covering shaft according to the difference Δ L to reduce the difference Δ L between the arc length L1 and the length L2;
and controlling the operation of the covering film shaft driving motor according to the adjusted driving torque of the covering film shaft.
Optionally, adjusting the driving torque of the mulch film shaft according to the difference Δ L comprises taking the difference Δ L as an input to a PID controller and adjusting the driving torque of the mulch film shaft according to an output of the PID controller.
Optionally, the forming mechanism comprises a heating mechanism and a blowing mechanism, and the formed film sequentially passes through the heating mechanism and the blowing mechanism and then enters the heat sealing mechanism;
the method further comprises the steps of:
measuring the temperature of the formed film in the blowing mechanism;
selecting a film length adjusting coefficient corresponding to the measured temperature according to the mapping relation between the temperature and the film length adjusting coefficient;
adjusting the length of the formed film passing through the heat sealing mechanism in the adjusting period according to the film length adjusting coefficient;
calculating the rotating speed of the heat sealing roller and the arc length of the heat sealing roller rotating in the adjusting period according to the length of the formed film passing through the heat sealing mechanism in the adjusting period;
and controlling the heat-sealing roller driving motor to work according to the calculation result.
Optionally, the formed film which is output by the heat sealing mechanism and covered with the covering film passes through a swing rod, and a tension sensor is arranged at the swing rod;
the method further comprises the steps of:
acquiring tension F2 at the position of the swing rod measured by the tension sensor;
calculating actual tension F3 of the cover film according to the corresponding relation between the preset tension at the swing rod and the tension of the cover film;
calculating a difference Δ F between a preset cover film tension F1 and an actual cover film tension F3;
adjusting the driving torque of the covering film shaft according to the difference value delta F to reduce the difference value delta F;
and controlling the operation of the covering film shaft driving motor according to the adjusted driving torque of the covering film shaft.
Alternatively, the actual cover film tension F3 is calculated according to the following formula:
F3＝a*F2+b
wherein a is a preset proportionality coefficient, and b is a preset constant.
Optionally, the adjusting the driving torque of the mulch film shaft according to the difference Δ F comprises the steps of:
reducing the driving torque of the cover film shaft if the preset cover film tension F1 is greater than the actual cover film tension F3;
if the preset cover film tension F1 is less than the actual cover film tension F3, the drive torque of the cover film shaft is increased.
The heat-sealing method of the bubble cap machine utilizes the servo feedback of the heat-sealing roller, calculates the diameter of the unwinding roller of the current covering film according to the rotating arc length of the heat-sealing roller and the rotating central angle of the covering film shaft, and calculates the driving torque of the covering film shaft according to the diameter of the unwinding roller of the covering film shaft, thereby realizing the whole-process constant tension control of the covering film in the heat-sealing process of the bubble cap machine, further greatly improving the tension stability of the covering film in the heat-sealing process of the covering film and the forming film, improving the sealing performance of the final product and improving the production yield of the product.
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the present invention and accompanying drawings, which are included to illustrate and not limit the scope of the present invention.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a work flow of a bubble cap machine;
FIG. 2 is a schematic structural diagram of a bubble cap machine used in the heat sealing method of the bubble cap machine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the principle of controlling the constant tension of the cover film in the heat-sealing method of the bubble-cap machine according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of the concept of adjusting the drive torque based on the change in the roll diameter of the mulch film roll in accordance with one embodiment of the invention;
FIG. 5 is a flow chart of a heat sealing method of a bubble cap machine according to an embodiment of the present invention;
FIG. 6 is a control schematic diagram of a constant tension control method in the heat-sealing method of the bubble cap machine according to an embodiment of the present invention;
FIG. 7 is a schematic block diagram of tension feedback control in a heat sealing method of a bubble cap machine according to an embodiment of the present invention;
FIG. 8 is a graph showing the change in tension of the cover film with time after the heat-sealing method using the bubble cap machine of the present invention;
FIG. 9 is a schematic block diagram of the register control in the heat-sealing method of the bubble cap machine according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of the change in stretched length of a PVC film with temperature;
fig. 11 is a schematic block diagram of a driving motor for controlling a heat-sealing roller according to a heating temperature of a PVC film according to an embodiment of the present invention.
Reference numerals:
1 PVC membrane unwinding mechanism 8 heat-seal roller
2 heating mechanism 9 pendulum rod
Code printing mechanism of 3 blow molding mechanism 10
4 punching and drawing mechanism of forming and drawing mechanism 11
5 mechanism 12 die cutting mechanism is filled to material
6 cover membrane unwinding mechanism 13 conveying mechanism
7 compression roller 14 image acquisition device
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the inventive aspects may be practiced without one or more of the specific details, or with other structures, components, steps, methods, and so forth. In other instances, well-known structures, components, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Fig. 1 shows a general workflow of a bubble cap machine. The PVC film is firstly heated by a heating mechanism and then molded in a blow molding mechanism, the PVC film is drawn to the lower part of a filling mechanism through molding after molding, materials are filled, for example, capsules, tablets and other materials are filled into the molded film, then the molded film and an aluminum film are subjected to heat sealing together at a heat sealing mechanism, the sealing performance of a final product is determined by the heat sealing effect, the finished product enters a coding mechanism for coding after heat sealing, then enters a punching mechanism through a punching traction mechanism for punching, and enters a conveying mechanism after punching is completed for finished product output and waste recovery.
Fig. 2 is a schematic structural diagram of a bubble cap machine applied to the bubble cap machine heat sealing method according to an embodiment of the present invention. The method comprises the steps that firstly, a PVC film discharged from a PVC film unwinding mechanism 1 is heated to a specified temperature through a heating mechanism 2, then the PVC film enters a blowing mechanism 3 for blowing to obtain a formed film, the formed film is fed below a material filling mechanism 5 through a formed film traction mechanism 4, a covering film, namely an aluminum film, is discharged from a covering film unwinding mechanism 6 and then enters a heat sealing mechanism together with the formed film filled with the material, the covering film and the formed film are pressed together through pressure between a compression roller 7 and a heat sealing roller 8 in the heat sealing mechanism, so that the covering film is arranged on the surface of the formed film at the heat sealing roller 8, the covering film and the formed film are covered together and then enter a coding mechanism 10 for coding, then enter a punching mechanism 12 for punching through a punching traction mechanism 11, and enter a conveying mechanism 13 after punching is finished, and finished product output and waste recovery are achieved.
Only one construction and operating principle of the bubble cap machine is shown here in fig. 1 and 2. In practice, the specific work flow and structure of the bubble machine may be different from those described above, but does not affect the application of the heat-sealing method of the bubble machine of the present invention. That is, the heat-sealing method of the bubble cap machine of the present invention is not limited to the bubble cap machine using the forms of fig. 1 and 2, and can be applied to other forms of bubble cap machines.
In order to solve the problems in the prior art, the invention provides a heat sealing method of a bubble cap machine, which is used for realizing the constant tension control of a covering film in the heat sealing process of the bubble cap machine. The bubble cap machine adopting the bubble cap machine heat sealing method at least needs to comprise a forming mechanism, a heat sealing mechanism and a covering film unwinding mechanism, wherein the heat sealing mechanism comprises a heat sealing roller and a heat sealing roller driving motor, the covering film unwinding mechanism comprises a covering film shaft and a covering film shaft driving motor, a forming film is driven by the forming mechanism to enter the heat sealing mechanism, the covering film is driven by the covering film unwinding mechanism to enter the heat sealing mechanism, so that the covering film is covered on the surface of the forming film in the heat sealing roller position.
FIG. 3 is a schematic diagram illustrating the principle of controlling the constant tension of the cover film in the heat-sealing method of the bubble-cap machine according to an embodiment of the present invention; FIG. 4 is a schematic diagram of the principle of adjusting the driving torque according to the change of the roll diameter of the covering film shaft according to one embodiment of the present invention. In this embodiment, the arc length of the molded film passing through the heat seal roller in the measurement period can be known by the radius of the heat seal roller 8 and the angle feedback of the servo controller of the heat seal roller drive motor, then the radius of the cover film shaft at the present time is calculated, and the drive torque of the cover film shaft drive motor is calculated by the relationship between the drive torque, the radius and the tension of the cover film shaft drive motor. In fig. 4, the direction of the abscissa indicates that the radius of the cover film shaft is decreasing, the ordinate y indicates the cover film tension value F or the drive torque value F θ of the cover film shaft drive motor, the line a indicates that the cover film tension is kept constant as the radius of the cover film shaft decreases, and the line B indicates that the drive torque of the cover film shaft drive motor is decreased as the radius of the cover film shaft decreases in the case where the cover film tension is constant.
Fig. 5 is a flow chart of the heat-sealing method of the bubble-cap machine, and fig. 6 is a control schematic block diagram of the constant tension control method shown in fig. 5. The heat sealing method of the bubble cap machine comprises the following steps:
s100: acquiring a rotation central angle of the heat seal roller in a measurement period, and calculating the rotation arc length of the heat seal roller in the measurement period by combining the radius of the heat seal roller; the rotation central angle of the heat-sealing roller in the measurement period can be calculated according to the rotation speed of a heat-sealing roller driving motor, for example, the rotation speed of the heat-sealing roller driving motor is n revolutions per minute, 360 degrees x n is the rotation angle of the heat-sealing roller driving motor per minute, then the measurement period time is t1 minutes, and the rotation central angle of the heat-sealing roller in the measurement period time is 360 degrees x n x t 1; the radius of the heat-sealing roller can be measured in advance or determined according to the specification of the heat-sealing roller, and the radius of the heat-sealing roller is a fixed value instead of changing along with the reduction of the covering film like the radius of the shaft of the covering film;
s200: obtaining the arc length of the covering film shaft rotating in the measurement period according to the arc length of the heat seal roller rotating in the measurement period, for example, taking the arc length of the heat seal roller rotating in the measurement period as the arc length of the covering film shaft rotating in the measurement period, or taking the product of the arc length of the heat seal roller rotating in the measurement period and a preset coefficient k as the arc length of the covering film shaft rotating in the measurement period, wherein k can be a coefficient approximately equal to 1; here, the arc length of the heat-seal roller rotating in the measurement period is the arc length of the molding film passing through the heat-seal roller in the measurement period, and the arc length of the covering film shaft rotating in the measurement period is the arc length of the covering film passing through the heat-seal roller in the measurement period;
s300: acquiring a rotation central angle of the covering film shaft in a measurement period, and calculating the current radius of the covering film shaft by combining the arc length of the covering film shaft rotating in the measurement period;
s400: calculating the driving torque of the covering film shaft according to the preset covering film tension and the current radius of the covering film shaft;
s500: and controlling the operation of the covering film shaft driving motor according to the driving torque of the covering film shaft.
In this embodiment, in the step S100, the arc length of the heat seal roller rotating in the measurement period is calculated according to the following formula:
L1＝a1*R1
wherein L1 is the arc length of the heat seal roller rotating in the measuring period, a1 is the rotation central angle of the heat seal roller in the measuring period, and R1 is the radius of the heat seal roller.
In this embodiment, in step S300, the current radius of the axis of the cover film is calculated according to the following formula:
R2＝L1/a2
wherein L1 is the arc length of the heat seal roller rotating in the measuring period, a2 is the rotating central angle of the covering film shaft in the measuring period, and R2 is the current radius of the covering film shaft.
In this embodiment, in the step S400, the driving torque of the cover film shaft is calculated according to the following formula:
Fθ＝F1*R2
wherein, F theta is the driving torque of the covering film shaft, F1 is the preset covering film tension, and R2 is the current radius of the covering film shaft.
Further, the embodiment also provides a tension feedback control method in the heat sealing process of the bubble cap machine. As shown in fig. 3, the formed film covered with the cover film output by the heat sealing mechanism passes through a swing link 9, a tension sensor is arranged at the swing link 9, and the tension sensor can measure the tension of the formed film covered with the cover film at the swing link 9 and is used as the feedback input of the constant tension control of the cover film, so as to further adjust the operation of the driving motor of the cover film.
Fig. 7 is a schematic block diagram of the tension feedback control in this embodiment. The heat sealing method of the bubble cap machine further comprises the following steps:
acquiring tension F2 at the position of the swing rod measured by the tension sensor;
calculating actual tension F3 of the cover film according to the corresponding relation between the preset tension at the swing rod and the tension of the cover film;
calculating a difference value delta F between the preset covering film tension F1 and the actual covering film tension F3, wherein the difference value delta F is a tension feedback value;
adjusting the driving torque of the covering film shaft according to the difference value delta F to reduce the difference value delta F;
and controlling the operation of the covering film shaft driving motor according to the adjusted driving torque of the covering film shaft.
In this example, the actual cover film tension F3 was calculated according to the following formula:
F3＝a*F2+b
wherein a is a preset proportionality coefficient, and b is a preset constant. The specific indexes of a and b can be set according to needs, and empirical values can be selected according to multiple measurement tests.
In this embodiment, the adjusting the driving torque of the cover film shaft according to the difference Δ F includes the steps of:
reducing the driving torque of the cover film shaft if the preset cover film tension F1 is greater than the actual cover film tension F3;
if the preset cover film tension F1 is less than the actual cover film tension F3, the drive torque of the cover film shaft is increased.
FIG. 8 is a graph showing the change in tension of the cover film with time after the heat-sealing method using the bubble-cap machine of the present invention. It can be seen that the tension of the cover film is basically kept stable along with the development of time, the sealing performance of the cover film and the forming film is improved, and the product yield is improved.
Further, this embodiment also provides a register method during the heat sealing process of the bubble-cap machine to achieve the same speed of the cover film and the formed film when they enter the heat sealing mechanism. If the cover film moves faster, namely the length of the cover film passing through the heat sealing mechanism is greater than that of the forming film passing through the heat sealing mechanism within a certain time, the cover film can be laminated at the heat sealing mechanism, and if the cover film moves slower, namely the length of the cover film passing through the heat sealing mechanism is less than that of the forming film passing through the heat sealing mechanism within a certain time, the forming film and the cover film cannot correspond to each other. Therefore, it is necessary to ensure that the length of the cover film entering the heat-sealing mechanism is consistent with the length of the formed film entering the heat-sealing mechanism during the heat-sealing process.
In this embodiment, the cover film is provided with a plurality of color patches at known positions at predetermined positions, an image pickup device 14 is provided between the cover film shaft and the heat-seal roller, and the image pickup device 14 picks up color patch images of the cover film; the heat sealing method of the bubble cap machine further comprises the following steps:
calculating the length L2 of the cover film entering the heat sealing mechanism in the measuring period according to the time when the color mark image is acquired by the image acquisition device and the known position of the color mark; for example, in the measurement period, the image acquisition device acquires three color patch images, the interval between every two color patch images is a fixed value L, and the length L2 of the covering film entering the heat sealing mechanism in the measurement period is 3L;
comparing the arc length of the heat-sealing roller rotating in the measuring period L1 with the length of the cover film entering the heat-sealing mechanism in the measuring period L2;
calculating the difference value delta L between the arc length L1 and the length L2, and adjusting the driving torque of the covering film shaft according to the difference value delta L to reduce the difference value delta L between the arc length L1 and the length L2, wherein the difference value delta L is a length feedback value;
and controlling the operation of the covering film shaft driving motor according to the adjusted driving torque of the covering film shaft.
In this embodiment, the adjusting the driving torque of the mulch film shaft according to the difference Δ L includes adjusting the driving torque of the mulch film shaft according to an output of a PID controller using the difference Δ L as an input of the PID controller. Specifically, when Δ L is greater than zero, it indicates that the molded film is moving fast, and at this time, the motor torque is reduced to increase the rotational speed of the cover film shaft, and when Δ L is less than zero, it indicates that the cover film is moving fast, and at this time, the motor torque is increased to decrease the rotational speed of the cover film shaft.
Further, in this embodiment, the forming mechanism includes a heating mechanism and a blowing mechanism, and the formed film sequentially passes through the heating mechanism and the blowing mechanism and then enters the heat-sealing mechanism. As shown in fig. 10, a schematic diagram of the change of the stretching length of the PVC film according to the change of temperature is shown. The PVC film has the characteristics of high tensile strength, good transparency, uniform thickness and good bonding performance. However, when the PVC film is heated to different temperatures in the heating mechanism, the depth of the bubble formed in the blowing mechanism is different, so that the actual length of the formed film is different from the expected length (i.e., the arc length of the heat seal roll).
The heat sealing method of the bubble cap machine further comprises the following steps:
measuring the temperature of the formed film in the blowing mechanism;
selecting a film length adjusting coefficient k corresponding to the measured temperature according to the mapping relation between the temperature and the film length adjusting coefficient; the mapping relationship between the temperature and the film length adjustment coefficient may be preset and stored mapping relationship data, such as the temperature of 40-80 ℃ corresponding to the film length adjustment coefficient k1, the temperature of 80-120 ℃ corresponding to the film length adjustment coefficient k2, etc.;
adjusting the length L4 of the formed film passing through the heat-sealing mechanism in the adjusting period according to the film length adjusting coefficient k, wherein the length L4 of the formed film passing through the heat-sealing mechanism in the adjusting period is a preset value, namely an ideal value, and the length L4 xk of the formed film passing through the heat-sealing mechanism in the adjusted adjusting period;
calculating the rotating speed of the heat sealing roller and the arc length of the heat sealing roller rotating in the adjusting period according to the length L4 xk of the formed film passing through the heat sealing mechanism in the adjusting period; the arc length of the heat sealing roller in the adjusting period is L4 xk, the central angle of the heat sealing roller in the adjusting period is a 3-L4 xk/R1, R1 is the radius of the heat sealing roller, and the rotating speed of the heat sealing roller can be calculated according to a3 and the adjusting period t 2.
And controlling the heat-sealing roller driving motor to work according to the calculation result, specifically, controlling the driving torque of the heat-sealing roller driving motor according to the rotating speed of the heat-sealing roller and the arc length of the heat-sealing roller rotating in the adjusting period.
Therefore, the embodiment can realize the constant tension control of the covering film of the bubble machine in the heat sealing process by adopting the closed-loop control in fig. 6, in addition, the tension feedback control shown in fig. 7 is further added, the tension stability of the bubble machine in the heat sealing process is enhanced, the length feedback control shown in fig. 9 is further added, the register of the covering film and the forming film of the bubble machine in the heat sealing process is realized, the temperature feedback control of fig. 11 is further added, and the constant speed output of the forming film at different temperatures is realized. Therefore, by adopting the heat sealing method of the bubble cap machine, the sealing performance in the heat sealing process can be improved, and the product yield is further improved.
In conclusion, the heat-sealing method of the bubble cap machine utilizes the servo feedback of the heat-sealing roller, calculates the diameter of the unwinding roller of the current covering film according to the rotating arc length of the heat-sealing roller and the rotating central angle of the covering film shaft, and calculates the driving torque of the covering film shaft according to the diameter of the unwinding roller of the covering film shaft, so that the whole-process constant tension control of the covering film in the heat-sealing process of the bubble cap machine is realized, the tension stability of the covering film in the heat-sealing process of the covering film and the forming film is greatly improved, the sealing performance of the final product is improved, and the production yield of the product is improved.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (10)
1. A heat sealing method of a bubble cap machine is characterized in that the bubble cap machine comprises a forming mechanism, a heat sealing mechanism and a covering film unwinding mechanism, wherein the heat sealing mechanism comprises a heat sealing roller and a heat sealing roller driving motor;
the method comprises the following steps:
acquiring a rotation central angle of the heat seal roller in a measurement period, and calculating the rotation arc length of the heat seal roller in the measurement period by combining the radius of the heat seal roller;
obtaining the arc length of the covering film shaft rotating in the measuring period according to the arc length of the heat seal roller rotating in the measuring period;
acquiring a rotation central angle of the covering film shaft in a measurement period, and calculating the current radius of the covering film shaft by combining the arc length of the covering film shaft rotating in the measurement period;
calculating the driving torque of the covering film shaft according to the preset covering film tension and the current radius of the covering film shaft;
and controlling the operation of the covering film shaft driving motor according to the driving torque of the covering film shaft.
2. A heat-sealing method of a blister machine according to claim 1, characterized in that the arc length of the rotation of the heat-sealing roller during the measuring period is calculated according to the following formula:
L1＝a1*R1
wherein L1 is the arc length of the heat seal roller rotating in the measuring period, a1 is the rotation central angle of the heat seal roller in the measuring period, and R1 is the radius of the heat seal roller.
3. The heat-sealing method of a bubble cap machine according to claim 1, wherein an arc length of the heat-sealing roller rotating in the measuring period is taken as an arc length of the cover film shaft rotating in the measuring period;
calculating the current radius of the shaft of the cover film according to the following formula:
R2＝L1/a2
wherein L1 is the arc length of the heat seal roller rotating in the measuring period, a2 is the rotating central angle of the covering film shaft in the measuring period, and R2 is the current radius of the covering film shaft.
4. A heat-sealing method of a blister machine according to claim 1, wherein the driving torque of the cover film shaft is calculated according to the following formula:
Fθ＝F1*R2
wherein, F theta is the driving torque of the covering film shaft, F1 is the preset covering film tension, and R2 is the current radius of the covering film shaft.
5. The heat-sealing method of a blister machine according to claim 1, wherein a plurality of color patches of known positions are provided on the cover film at predetermined positions, and an image pickup device is provided between the cover film shaft and the heat-sealing roller, the image pickup device picking up the color patch images of the cover film;
the method further comprises the steps of:
calculating the length L2 of the cover film entering the heat sealing mechanism in the measuring period according to the time when the color mark image is acquired by the image acquisition device and the known position of the color mark;
comparing the arc length of the heat-sealing roller rotating in the measuring period L1 with the length of the cover film entering the heat-sealing mechanism in the measuring period L2;
calculating a difference Δ L between an arc length L1 and a length L2, and adjusting a driving torque of the film covering shaft according to the difference Δ L to reduce the difference Δ L between the arc length L1 and the length L2;
and controlling the operation of the covering film shaft driving motor according to the adjusted driving torque of the covering film shaft.
6. The heat-sealing method for a bubble cap machine according to claim 5, wherein adjusting the driving torque of the cover film shaft according to the difference Δ L comprises adjusting the driving torque of the cover film shaft according to an output of a PID controller using the difference Δ L as an input of the PID controller.
7. The heat-sealing method of a bubble cap machine according to claim 1, wherein the forming mechanism comprises a heating mechanism and a blowing mechanism, and the formed film enters the heat-sealing mechanism after passing through the heating mechanism and the blowing mechanism in sequence;
the method further comprises the steps of:
measuring the temperature of the formed film in the blowing mechanism;
selecting a film length adjusting coefficient corresponding to the measured temperature according to the mapping relation between the temperature and the film length adjusting coefficient;
adjusting the length of the formed film passing through the heat sealing mechanism in the adjusting period according to the film length adjusting coefficient;
calculating the rotating speed of the heat sealing roller and the arc length of the heat sealing roller rotating in the adjusting period according to the length of the formed film passing through the heat sealing mechanism in the adjusting period;
and controlling the heat-sealing roller driving motor to work according to the calculation result.
8. The heat-sealing method of a bubble cap machine according to claim 1, wherein the formed film covered with the cover film and outputted by the heat-sealing mechanism passes through a swing rod, and a tension sensor is arranged at the swing rod;
the method further comprises the steps of:
acquiring tension F2 at the position of the swing rod measured by the tension sensor;
calculating actual tension F3 of the cover film according to the corresponding relation between the preset tension at the swing rod and the tension of the cover film;
calculating a difference Δ F between a preset cover film tension F1 and an actual cover film tension F3;
adjusting the driving torque of the covering film shaft according to the difference value delta F to reduce the difference value delta F;
and controlling the operation of the covering film shaft driving motor according to the adjusted driving torque of the covering film shaft.
9. A blister machine heat-sealing method according to claim 8, characterized in that the actual cover film tension F3 is calculated according to the following formula:
F3＝a*F2+b
wherein a is a preset proportionality coefficient, and b is a preset constant.
10. A heat-sealing method of a blister machine according to claim 8, wherein said adjusting the driving torque of said cover film shaft according to the difference Δ F comprises the steps of:
reducing the driving torque of the cover film shaft if the preset cover film tension F1 is greater than the actual cover film tension F3;
if the preset cover film tension F1 is less than the actual cover film tension F3, the drive torque of the cover film shaft is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811291664.2A CN111114910B (en) | 2018-10-31 | 2018-10-31 | Heat sealing method of bubble cap machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811291664.2A CN111114910B (en) | 2018-10-31 | 2018-10-31 | Heat sealing method of bubble cap machine |
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| CN111114910A CN111114910A (en) | 2020-05-08 |
| CN111114910B true CN111114910B (en) | 2021-09-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IT1145646B (en) * | 1981-12-30 | 1986-11-05 | Ferrero Spa | PROCESS AND MACHINE FOR PACKAGING PRODUCTS FORMED BY CASTING IN THE THERMOFORMED ENCLOSURE OF A BLISTER TYPE PACKAGE |
| US5094708A (en) * | 1990-08-28 | 1992-03-10 | Graphic Communications, Inc. | Registration system for a continuous web |
| US10421313B2 (en) * | 2005-03-24 | 2019-09-24 | Richard Lavosky | Electron-beam coating device |
| TWI455864B (en) * | 2009-12-29 | 2014-10-11 | Delta Electronics Inc | Built-in tension control system with integrated tension and velocity closed loops in inverter |
| JP2012140248A (en) * | 2010-12-13 | 2012-07-26 | Sanwa Jidoki Seisakusho:Kk | Method and device for splicing film sheets |
| CN202988367U (en) * | 2012-12-27 | 2013-06-12 | 南京鹏力塑料科技有限公司 | Automatic tension control device of straw packaging machine |
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Effective date of registration: 20210107 Address after: 215200 no.1688, Jiangxing East Road, Wujiang Economic and Technological Development Zone, Wujiang City, Suzhou City, Jiangsu Province Applicant after: Delta Electronics (Jiangsu) Ltd. Address before: 215200 no.1688, Jiangxing East Road, Wujiang Economic Development Zone, Suzhou City, Jiangsu Province Applicant before: DELTA ELECTRONICS COMPONENTS (WUJIANG) Ltd. |
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