CN110328832B - Bubble inflation condensation form accurate measurement and control equipment and accurate measurement and control method - Google Patents
Bubble inflation condensation form accurate measurement and control equipment and accurate measurement and control method Download PDFInfo
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- CN110328832B CN110328832B CN201910629784.7A CN201910629784A CN110328832B CN 110328832 B CN110328832 B CN 110328832B CN 201910629784 A CN201910629784 A CN 201910629784A CN 110328832 B CN110328832 B CN 110328832B
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
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Abstract
The accurate measurement and control equipment for the film bubble inflation condensation form comprises an extrusion die head, wherein a cooling air ring is arranged on the extrusion die head, two cameras are fixedly arranged above the cooling air ring, the orientation of the first camera is horizontal longitudinal, the orientation of the second camera is horizontal transverse, an upright first background plate is arranged in the front direction of the first camera, and an upright second background plate is arranged in the front direction of the second camera; the first background plate is provided with a first vertical reference line and a first reference point which can be shot by a first camera and recognized by the central controller, and the second background plate is provided with a second vertical reference line and a second reference point which can be shot by a second camera and recognized by the central controller; and four vertical air suction plates are arranged beside the moving track of the film bubble. The invention also provides a method for accurately measuring and controlling the bubble inflation condensation form. The invention can accurately measure and control the diameter of the bubble, the condensation speed of the bubble and the horizontal shaking degree of the bubble.
Description
Technical Field
The invention belongs to the technical field of plastic film production, and particularly relates to a device and a method for accurately measuring and controlling a bubble inflation and condensation state of a film.
Background
The plastic film may be produced by a plastic film blowing apparatus. As shown in fig. 1, the conventional film blowing apparatus includes an extrusion die head 1, the extrusion die head is provided with a circular extrusion port 10, a cooling air ring 11 is disposed above the extrusion die head 1, the extrusion die head 1 is further provided with an air inlet pipe 12 and an air outlet pipe 13, the air inlet pipe is connected to an air blower 14, the air outlet pipe is connected to an air exhauster 15, and an inner end 120 of the air inlet pipe and an inner end 130 of the air outlet pipe are respectively opened in the central area of the upper surface of the extrusion die head 1. During production, a molten plastic material is extruded from the circular extrusion port 10 of the extrusion die head 1 to form a circular film bubble 8 and moves upwards, the circular film bubble is cooled by cold air blown out from the air outlet of the cooling air ring 11 in the operation process to be gradually cooled, when the circular film bubble 8 moves to a certain vertical position, the temperature of the circular film bubble 8 is reduced to a condensation temperature, condensation and crystallization occur, and the vertical position is called a condensation line (the position is shown as a dotted line RS in fig. 1). In the above process, the blower 14 fills the bubble 8 with compressed air with a certain pressure through the intake duct 12, and the bubble 8 below the condensation line will be blown up by the compressed air because it is not yet condensed, so that the diameter of the bubble 8 is gradually enlarged, and the section of the bubble between the circular extrusion opening 10 and the condensation line is called a blowing section (for example, RM/SN section in fig. 1). After the bubble 8 passes through the condensation line, the bubble can not be blown up due to condensation, the diameter of the bubble does not change any more, and the final forming effect of the bubble is mainly determined by the stage of the blowing section before condensation, namely the stage below the condensation line, so that the shape monitoring and the regulation of the bubble at the position below the condensation line and the position close to the condensation line are very important.
The monitoring and control of the film bubble part below the condensation line and near the condensation line mainly comprises the following three aspects:
first, bubble diameter
The bubble diameter (the diameter after the bubble is completely blown and condensed) is one of the important control parameters in the blown film production process, so the bubble diameter must be measured and controlled continuously in the production process. In the prior art, the bubble diameter detection device is mainly an ultrasonic range finder, as shown in fig. 1, an ultrasonic range finder 16 is fixedly installed beside a moving track of a bubble 8, and a vertical central axis of an extrusion die head 1 (which is also equivalent to a vertical central axis of a circular extrusion die head 1 with an accurate position) is aligned right in front of the ultrasonic sensing range finder 16. During production, the ultrasonic distance meter 16 continuously detects the horizontal distance r between itself and the film bubble 81(ii) a On the other hand, the horizontal distance r due to the ultrasonic range finder 16 from the vertical central axis of the circular extrusion die 12The size is fixed, so the diameter d of the bubble can be according to the formula d =2 (r)2-r1) And calculating to obtain the product.
However, the detection result of the existing bubble diameter detection device is not accurate enough, which is mainly due to the following reasons: in the upward movement process of the film bubble, the film bubble can generate horizontal swinging and shaking, namely the center of the film bubble deviates from the vertical central axis of the circular extrusion die head 1, so that the theoretical model of the formula is distorted. The detection result of the bubble diameter is not accurate enough, so that the transverse stretching proportion of the film and the width control of the final film product are not accurate enough, and the quality of the film blowing process is influenced.
Second, bubble condensation rate
The bubble condensation speed is also an important control factor of the film blowing process, and directly influences the condensation quality of plastic crystals and the blowing effect of the bubbles. The film bubble condensation speed is intuitively reflected in the height of the vertical position of the film bubble condensation line, and specifically, the faster the cooling speed is, the earlier the film bubble is condensed, and the lower the position of the condensation line is. In the prior art, the position of the condensation line of the bubble is mainly judged by visual inspection and experience of workers, and is regulated and controlled accordingly.
Thirdly, the horizontal deviation or shaking degree of the film bubble in the vertical operation process
In the process of continuously drawing and vertically operating the film bubble after being extruded, because the film bubble is very soft and under the influence of unstable factors of internal and external airflow, the center of the film bubble cannot be automatically kept on the central axis of the extrusion die head, and horizontal deviation or shaking can be inevitably generated. Obviously, because the film bubble near the condensation line and below the condensation line is very young and tender, if the horizontal deflection of the film bubble is too serious, the forming quality of the film bubble below the condensation line can be affected. In order to control the degree of deflection or sloshing within a certain range, bubble stabilizers are generally used in the prior art. The bubble stabilizer comprises an annular fixing frame, a plurality of stabilizing rollers are mounted on the annular fixing frame, the rotating shaft mounting direction of each stabilizing roller is horizontal and close to the tangential direction of the film bubble, the stabilizing rollers on the annular fixing frame are arranged into a plurality of layers and a plurality of columns, the bubble stabilizing rollers on the same layer are arranged into a circle, and the stabilizing rollers on the same column are arranged from top to bottom. During operation, each stabilizing roller of the same layer surrounds the film bubble at the center, and when the horizontal deflection of the film bubble reaches a certain degree, the film bubble can contact the stabilizing rollers and cannot deviate any further, so that the shaking amplitude of the film bubble is limited. However, the above-mentioned measures for limiting the horizontal bubble oscillation amplitude by means of the bubble stabilizer have the following disadvantages: (1) the regulation and control mode belongs to passive control, namely the stabilizing roller only acts when the film bubble deflects to a certain degree; (2) when the bubble contacts the stabilizing roller, although the stabilizing roller can rotate to reduce the friction with the bubble surface, the power of the rotation of the stabilizing roller is also the twisting of the vertically running bubble, according to the principle of acting force and reacting force, the reacting force of the twisting force is the acting force of the stabilizing roller on the bubble surface, and the thin and tender bubble can be pulled or scratched due to the pulling force of the stabilizing roller on the bubble surface.
Disclosure of Invention
The invention aims to overcome the defects and provide the accurate measurement and control equipment and the accurate measurement and control method for the bubble inflation condensation form, which can accurately measure and control the diameter of the bubble, the condensation speed of the bubble and the horizontal shaking degree of the bubble.
The purpose can be realized according to the following scheme: the accurate measurement and control equipment for the blown and condensed shape of the film bubble comprises an extrusion die head, wherein the extrusion die head is provided with a circular extrusion port for extruding the film bubble, a cooling air ring is arranged on the extrusion die head, and the central point of the cooling air ring and the central point of the circular extrusion port are both positioned on the vertical central axis of the extrusion die head;
the cooling air ring is matched with a cooling fan and a cooling air flow temperature control unit; the extrusion die head is also provided with a central controller, the central controller is connected to the cooling air flow temperature control unit, the extrusion die head is provided with an air inlet pipeline and an air outlet pipeline, the air inlet pipeline is connected with an air blower, the air outlet pipeline is connected with an exhaust fan, the inner end of the air inlet pipeline and the inner end of the air outlet pipeline are respectively opened in the central area of the upper surface of the extrusion die head, and the central controller is connected to the air blower and the exhaust fan;
the method is characterized in that: two cameras are fixedly arranged above the cooling air ring and are respectively connected to the central controller; the vertical positions of the two cameras are the same, the vertical positions of the two cameras are close to and higher than the highest condensation position of the bubble, the two cameras are aligned to the vertical central axis of the extrusion die head, the orientation of the first camera is horizontal longitudinal direction, the orientation of the second camera is horizontal transverse direction, the orientations of the two cameras are mutually vertical, an upright first background plate is further arranged in the front direction of the first camera, an upright second background plate is further arranged in the front direction of the second camera, the horizontal projection extending direction of the first background plate is transverse direction, and the horizontal projection extending direction of the second background plate is longitudinal direction; the first camera and the first background plate are respectively positioned at the front and back opposite sides of the moving track of the bubble, and the second camera and the second background plate are respectively positioned at the left and right opposite sides of the moving track of the bubble;
a first vertical datum line and a first datum point which can be shot by a first camera and identified by a central controller are arranged on the first background plate, the vertical position of the first datum point is flush with the vertical position of the first camera, and the extending direction of the first vertical datum line is vertical;
a second vertical datum line and a second datum point which can be shot by a second camera and identified by the central controller are arranged on the second background plate, the vertical position of the second datum point is flush with the vertical position of the second camera, and the extending direction of the second vertical datum line is vertical;
four upright air suction plates are arranged beside the film bubble moving track and are respectively positioned in the front, back, left and right directions of the film bubble moving track, and the vertical position of each upright air suction plate is higher than the vertical positions of the two cameras; the plane of the first air suction plate and the plane of the third air suction plate are parallel to the first background plate, the first air suction plate and the third air suction plate are positioned at the front side and the rear side of the moving track of the bubble, the second air suction plate and the fourth air suction plate are positioned at the left side and the right side of the moving track of the bubble, and the plane of the second air suction plate and the plane of the fourth air suction plate are parallel to the second background plate; the surface of each air suction plate is provided with a plurality of air suction holes, a negative pressure chamber is arranged at the back of each air suction plate, the air suction holes of the air suction plates are communicated with the corresponding negative pressure chambers, and each negative pressure chamber is correspondingly connected with an air suction pump; the central controller is connected with each air suction pump.
After the film bubble is extruded, the position of the condensation line of the film bubble can fluctuate to a certain extent due to the temperature of cooling air flow, the change of the formula of the film bubble, the change of the thickness of the film bubble and the like, namely, a certain fluctuation range exists. The "highest condensation position of the bubble" refers to the highest point position of the fluctuation range of the condensation line position.
By "the vertical position of the camera is close to and above the highest condensation position of the bubble" it is meant that the vertical position of the camera is slightly above the highest condensation position of the bubble. So the vertical position of camera needs the highest condensation position that is a little higher than the membrane bubble, mainly has two purposes: firstly, ensuring that a film bubble right in front of the camera level is condensed (the diameter is not increased any more); secondly, satisfying under the prerequisite of first point, the inflation section that makes the vertical position of camera be close to the membrane bubble to can shoot the inflation section of membrane bubble. From the two effects mentioned above, it can be seen that: in order to realize that the vertical position of the camera is slightly higher than the highest condensation position of the film bubble, the highest condensation position of the film bubble does not need to be determined very accurately, and the vertical position of the CCD camera is close to and higher than the highest condensation position of the film bubble only by roughly estimating the highest condensation position of the film bubble according to experience and then adjusting the vertical position of the camera by a distance on the basis of the estimation.
The "front direction of the first camera" refers to a direction in which the first camera is oriented.
The "front direction of the second camera" refers to a direction in which the second camera is directed.
The "background plate" refers to a plate that forms a background as a bubble during image capture.
A bubble inflation condensation form accurate measurement and control method is characterized in that bubble inflation condensation form measurement and control equipment is adopted, in the measurement and control process, bubbles are extruded by a circular extrusion port of an extrusion die head and then are continuously pulled to run upwards, vertically penetrate through a space between a first camera and a first background plate and a space between a second camera and a second background plate, then vertically penetrate through a space between a first air suction plate and a third air suction plate and a space between a second air suction plate and a fourth air suction plate, the bubbles and the first background plate are photographed by the first camera to form a first image, an image formed by the bubbles in the first image is a first bubble image, an image formed by a first vertical datum line in the first image is a first vertical datum line image, and an image formed by a first datum point in the first image is a first datum point image;
the bubble and the second background plate are shot by a second camera to form a second image, the image formed by the bubble in the second image is a second bubble image, the image formed by the second vertical datum line in the second image is a second vertical datum line image, and the image formed by the second datum point in the second image is a second datum point image;
the central controller identifies a first image obtained by a first camera, and determines the left and right edge positions of a first bubble image, the position of a first vertical datum line image and the position of a first datum point image in the first image; the central controller identifies a second image obtained by the second camera, determines the front edge position and the rear edge position of a second bubble image, the position of a second vertical datum line image and the position of a second datum point image in the second image, measures and calculates the form of the bubble after blowing and condensation by using the first image and the second image, and then regulates and controls, wherein each regulation and control process comprises the following steps:
(a) measuring and controlling the diameter of the bubble after the bubble is blown and condensed, and sequentially comprising the following steps (a 1) to (a 6):
(a1) determining a first transverse distance between a left edge point of the first bubble image and the first vertical datum line image and a second transverse distance between a right edge point of the first bubble image and the first vertical datum line image on a horizontal transverse line passing through the first datum point image in the first image; in the second image, on a horizontal cross-section line passing through the second reference point image, determining a first longitudinal distance between the front edge point of the second bubble image and the second vertical reference line image, and determining a second longitudinal distance between the rear edge point of the second bubble image and the second vertical reference line image; when determining the values of the first and second lateral distances, the scale of the first image should be 1: 1, proportioning; when determining the numerical values of the first longitudinal distance and the second longitudinal distance, the proportion of the second image should be 1: 1, proportioning;
(a2) establishing a coordinate system on a horizontal section where the first camera is located, wherein the intersection point of extension lines of the first background plate and the second background plate on the horizontal section is taken as an origin, the extension direction of the first background plate on the horizontal section is taken as an x-axis direction, and the extension direction of the second background plate on the horizontal section is taken as a y-axis direction; determining a coordinate value of a point A where a first CCD camera is located, and determining a coordinate value of a point E where a second CCD camera is located; determining the abscissa position of the point of the first vertical datum line on the horizontal section and the ordinate position of the point of the second vertical datum line on the horizontal section;
according to the abscissa position of the point of the first vertical datum line on the horizontal section and the first transverse distance, determining a coordinate value of a first intersection point of a left tangent of a bubble circle at the point A of the first CCD camera and the x axis;
according to the abscissa position of the point of the first vertical datum line on the horizontal section and the second transverse distance, determining a coordinate value of a second intersection point of the right tangent of the bubble circle at the point A of the first CCD camera and the x axis;
according to the vertical coordinate position of the point of the second vertical datum line on the horizontal section and the first longitudinal distance, determining the coordinate value of a third intersection point of the tangent line at the front side of the bubble circle of the point E where the second CCD camera is located and the y axis;
according to the vertical coordinate position of the point of the second vertical datum line on the horizontal section and the second longitudinal distance, determining the coordinate value of a fourth intersection point of the rear tangent line of the bubble circle at the point E of the second CCD camera and the y axis;
(a3) determining a coordinate equation of a first connecting line between a point A where a first camera is located and the first intersection point, determining a coordinate equation of a second connecting line between the point A where the first camera is located and the second intersection point, determining a coordinate equation of a third connecting line between a point E where a second camera is located and the third intersection point, and determining a coordinate equation of a fourth connecting line between the point E where the second camera is located and the fourth intersection point;
(a4) determining a coordinate equation of a first angle bisector between the first connecting line and the second connecting line, and determining a coordinate equation of a second angle bisector between the third connecting line and the fourth connecting line;
(a5) determining the coordinate position of the intersection point of the first angular bisector and the second angular bisector, wherein the intersection point is the circle center of the bubble, calculating the distance between the circle center position of the bubble and the first connecting line, and twice the distance is the actual diameter value of the bubble after the bubble is blown and condensed;
(a6) the central controller regulates and controls the diameter of the bubble according to the actual value of the diameter of the bubble measured and calculated in the step (a 5), and when the actual value of the diameter of the bubble measured and calculated deviates from the target value, the central controller sends a command to the blower or the exhaust fan to regulate and control the internal air pressure of the bubble, so that the degree of inflation of the bubble is changed to regulate the diameter;
(b) the method for measuring and controlling the actual condensation line position of the bubble sequentially comprises the following steps (b 1) - (b 5):
(b1) determining the width of the first bubble image on each horizontal section in the first image;
(b2) defining the vertical position of the condensation line in the first bubble image according to the following rules: the horizontal width of the condensation line of the first bubble image is larger than the horizontal width of the first bubble image on each horizontal section below the condensation line and is equal to the horizontal width of the first bubble image on each horizontal section above the condensation line; and determining the absolute value H of the vertical height difference between the position of the film bubble condensation line image in the first image and the position image of the first datum point, wherein when the absolute value H of the vertical height difference is determined, the proportion of the first image is 1: 1, proportioning;
(b3) calculating a longitudinal horizontal distance m between the first camera and the center of the bubble according to the coordinate positions of the first camera and the center of the bubble, wherein the coordinate position of the center of the bubble is taken according to the calculation result of the substep (a 5), and the coordinate position of the first camera is taken according to the result of the substep (a 2);
(b4) and calculating the vertical position of the actual condensation line of the film bubble according to the following formula: the height difference value between the vertical position of the actual condensation line of the bubble and the vertical position of the first camera is H = -H multiplied by m/n, wherein H is the absolute value of the vertical height difference between the image position of the bubble condensation line in the first image and the first reference point image, and m is the longitudinal horizontal distance between the first camera and the center of the bubble; n is the longitudinal horizontal distance between the first camera and the first background plate; h is a negative value, which indicates that the actual condensation line of the film bubble is lower than the vertical position of the first camera;
(b5) the central controller regulates and controls the vertical position of the actual condensation line of the film bubble according to the result obtained in the sub-step (b 4); if the vertical position of the actual condensation line of the film bubble is higher, the central controller commands the cooling air flow temperature control unit of the cooling air ring to act, so that the temperature of the cooling air flow blown out by the cooling air ring is reduced, the condensation time of the film bubble is shortened, and the vertical position of the actual condensation line of the film bubble is reduced; on the contrary, if the vertical position of the actual condensation line of the film bubble is lower, the central controller commands the cooling air flow temperature control unit of the cooling air ring to act, so that the temperature of the cooling air flow blown out by the cooling air ring is increased, the condensation time of the film bubble is prolonged, and the vertical position of the actual condensation line of the film bubble is increased;
(c) measuring and controlling the deflection degree of the film bubble: calculating the center line position of a first bubble image in the first image according to the left and right edge positions of the first bubble image in the first image, and judging whether the bubble has shake deviation and deviation amplitude in the transverse direction or not according to the center line position of the first bubble image in the first image and the position of a first vertical reference line image in the first image; the central controller commands the air suction pump corresponding to the second air suction plate or the fourth air suction plate to start according to the offset direction and the offset amplitude of the film bubble in the transverse direction, so that the film bubble is correspondingly close to the direction close to the second air suction plate or the fourth air suction plate, and the offset amplitude is reduced;
calculating the center line position of a second bubble image in the second image according to the front edge position and the rear edge position of the second bubble image in the second image, and judging whether the bubble has offset in the longitudinal direction and the offset amplitude according to the center line position of the second bubble image in the second image and the position of a second vertical reference line image in the second image; the central controller commands the air suction pump corresponding to the first air suction plate or the third air suction plate to start according to the offset direction and the offset amplitude of the bubble in the longitudinal direction, so that the bubble is correspondingly close to the direction close to the first air suction plate or the third air suction plate, and the offset amplitude is reduced;
the above step (b) is followed by the step (a), and the step (c) is followed by the step (b).
The bubble image centerline is a line connecting the midpoints of the bubble images on the respective horizontal cross-sections.
The invention has the following advantages and effects:
the diameter of the bubble can be accurately measured and calculated no matter how the bubble shakes or how the bubble deviates from the central axis of the extrusion die head, so that the diameter of the bubble can be accurately controlled.
The invention can accurately determine the actual condensation line position of the film bubble, and regulate and control the condensation line position of the film bubble according to the actual condensation line position, namely control the condensation speed of the film bubble, thereby ensuring the condensation quality of the film bubble.
The invention can accurately measure and calculate the left-right shaking degree and the front-back shaking degree of the film bubble, and accordingly, the circle center position of the film bubble is close to the vertical central axis direction of the extrusion die head by utilizing the air suction plate, so that the shaking degree of the film bubble can be dynamically regulated and controlled in time, and the film bubble cannot be scratched or pulled in the regulation and control process.
Drawings
FIG. 1 is a schematic diagram of the prior bubble production process and measurement and control principle.
Fig. 2 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 3 is a schematic sectional view taken along line J-J in fig. 2.
Fig. 4 is a schematic view of the image pickup apparatus seen in the direction indicated by the arrow v in fig. 3.
Fig. 5 is a schematic view of the image pickup apparatus seen in the direction indicated by the arrow f in fig. 3.
Fig. 6 is a schematic horizontal cross-sectional view of the bubble imaged by the two CCD cameras of fig. 3 and the first and second images obtained by imaging.
Fig. 7 is a schematic diagram of the position relationship among the coordinates of the two CCD cameras, the first background plate, the second background plate and the film bubble in fig. 6.
Fig. 8 is a schematic sectional view taken along line L-L in fig. 2.
Fig. 9 is a schematic diagram of the effect of the first image obtained by the first CCD camera.
Fig. 10 is a schematic diagram of the effect of the second image obtained by the second CCD camera.
FIG. 11 is a schematic diagram showing the positional relationship between the position of the condensation line in the first bubble image and the actual condensation line of the bubble.
Detailed Description
Example one
As shown in fig. 2, 3, 4 and 5, the bubble inflation condensation form accurate measurement and control device comprises an extrusion die head 1, wherein the extrusion die head 1 is provided with a circular extrusion port 10 for extruding a bubble, a cooling air ring 11 is mounted on the extrusion die head 1, and the central point of the cooling air ring 11 and the central point of the circular extrusion port are both located on the vertical central axis of the extrusion die head 1; the cooling air ring 11 is provided with a cooling fan and a cooling air flow temperature control unit in a matching way; the extrusion die head is characterized by further comprising a central controller, the central controller is connected to a cooling air flow temperature control unit, the extrusion die head 1 is provided with an air inlet pipeline 12 and an air outlet pipeline 13, the air inlet pipeline 12 is connected with an air blower 14, the air outlet pipeline 13 is connected with an exhaust fan 15, the inner end 120 of the air inlet pipeline and the inner end 130 of the air outlet pipeline are respectively opened in the central area of the upper surface of the extrusion die head 1, and the central controller is connected to the air blower 14 and the exhaust fan 15.
As shown in fig. 2, fig. 3, fig. 4 and fig. 5, two CCD cameras (so-called CCD cameras, all of which are referred to as charge coupled device cameras in chinese) are fixedly installed above the cooling air ring 11, the vertical positions of the two CCD cameras are the same, the vertical positions of the two CCD cameras are close to and higher than the highest condensation position of the bubble, the two CCD cameras are both aligned with the vertical central axis of the extrusion die head 1, wherein the orientation of the first CCD camera 21 is horizontal and longitudinal, the orientation of the second CCD camera 22 is horizontal and transverse, the orientations of the two CCD cameras are horizontal and vertical to each other, a vertical first background plate 31 is arranged in the front direction of the first CCD camera, a vertical second background plate 32 is arranged in the front direction of the second CCD camera 22, the horizontal projection extending direction of the first background plate 31 is transverse, and the horizontal projection extending direction of the second background plate 32 is longitudinal; the first CCD camera 21 and the first background plate 31 are respectively positioned at the front and back opposite sides of the moving track of the bubble 8, and the second CCD camera 22 and the second background plate 32 are respectively positioned at the left and right opposite sides of the moving track of the bubble 8; a first vertical reference line 41 and a first reference point 51 which can be shot by the first CCD camera 21 and recognized by the central controller are arranged on the first background plate 31, the vertical position of the first reference point 51 is flush with the vertical position of the first CCD camera 21, and the extending direction of the first vertical reference line 41 is vertical, as shown in fig. 4;
a second vertical reference line 42 and a second reference point 52 which can be shot by the second CCD camera 22 and recognized by the central controller are arranged on the second background plate 32, the vertical position of the second reference point 52 is flush with the vertical position of the second CCD camera 22, and the extending direction of the second vertical reference line 42 is vertical, as shown in fig. 5; the first CCD camera 21 and the second CCD camera 22 are respectively connected to the central controller;
as shown in fig. 2, 3 and 8, four upright air suction plates are further arranged beside the moving track of the bubble 8, the four upright air suction plates are respectively positioned in the front, back, left and right directions of the moving track of the bubble 8, and the vertical position of each upright air suction plate is higher than the vertical positions of the two CCD cameras; the plane of the first air suction plate 61 and the plane of the third air suction plate 63 are parallel to the first background plate 31, the first air suction plate 61 is positioned on the front side of the bubble moving track, the third air suction plate 63 is positioned on the rear side of the bubble moving track, the second air suction plate 62 is positioned on the left side of the bubble moving track, the fourth air suction plate 64 is positioned on the right side of the bubble moving track, and the plane of the second air suction plate 62 and the fourth air suction plate 64 is parallel to the second background plate 32; the surface of each air suction plate is provided with a plurality of air suction holes 71, the back of each air suction plate is provided with a negative pressure chamber 72, the air suction holes 71 of each air suction plate are communicated with the corresponding negative pressure chambers 72, and each negative pressure chamber 72 is correspondingly connected with an air suction pump 73; the central controller is connected to each of the suction pumps 73.
Example two
A method for accurately measuring and controlling a bubble inflation condensation form adopts measurement and control equipment of the bubble inflation condensation form, in the measurement and control process, a bubble 8 is extruded by a circular extrusion port 10 of an extrusion die head 1 and then continuously pulled to run upwards, vertically penetrates through a space between a first CCD camera 21 and a first background plate 31 and a space between a second CCD camera 22 and a second background plate 32, then vertically penetrates through a space between a first air suction plate 61 and a third air suction plate 63 and a space between a second air suction plate 62 and a fourth air suction plate 64, as shown in figures 2, 3 and 8,
the bubble 8 and the first background plate 31 are imaged by the first CCD camera 21 to form a first image 91, the image formed by the bubble 8 in the first image 91 is a first bubble image 801, the image formed by the first vertical reference line 41 in the first image 91 is a first vertical reference line image 410, and the image formed by the first reference point 51 in the first image is a first reference point image 510, as shown in fig. 6 and 9;
the bubble 8 and the second background plate 32 are imaged by the second CCD camera 22 to form a second image 92, the image formed by the bubble 8 in the second image 92 is a second bubble image 802, the image formed by the second vertical reference line 42 in the second image 92 is a second vertical reference line image 420, and the image formed by the second reference point 52 in the second image is a second reference point image 520, as shown in fig. 6 and 10;
the central controller identifies the first image 91 obtained by the first CCD camera, and determines the left and right edge positions of the first bubble image 801, the position of the first vertical reference line image 410 and the position of the first reference point image 510 in the first image 91; the central controller identifies the second image 92 obtained by the second CCD camera, determines the front and rear edge positions of the second bubble image 802, the position of the second vertical reference line image 420 and the position of the second reference point image 520 in the second image, measures and calculates the form of the bubble after inflation and condensation by using the first image and the second image, and then performs regulation, each regulation process including the following steps:
(a) measuring and controlling the diameter of the bubble after the bubble is blown and condensed, and sequentially comprising the following steps (a 1) to (a 6):
(a1) in the first image 91, on a horizontal cross-section line passing through the first reference point image 510, determining a first lateral distance bz between a left edge point (point b in fig. 6 and 9) of the first bubble image 801 and the first vertical reference line image 410 (point z in fig. 6 and 9), and determining a second lateral distance cz between a right edge point (point c in fig. 6 and 9) of the first bubble image 801 and the first vertical reference line image (point z in fig. 6 and 9); in the second image 92, on a horizontal cross-section line passing through the second reference point image 520, a first longitudinal distance fq between a front edge point (point f in fig. 6 and 10) of the second bubble image 802 and the second vertical reference line image 420 (point q in fig. 6 and 10) is determined, and a second longitudinal distance gq between a rear edge point (point g in fig. 6 and 10) of the second bubble image 802 and the second vertical reference line image 420 (point q in fig. 6 and 10) is determined; in determining the values of the first and second lateral distances bz, cz, the scale of the first image should be 1: 1, proportioning; when determining the numerical values of the first longitudinal distance fq and the second longitudinal distance gq, the proportion of the second image should be 1: 1, proportioning; a
(a2) Establishing a coordinate system on a horizontal section where the first CCD camera 21 is located, with an intersection point of extension lines of the first background plate 31 and the second background plate 32 on the horizontal section as an origin O, with an extending direction of the first background plate 31 on the horizontal section as an x-axis direction, and with an extending direction of the second background plate 32 on the horizontal section as a y-axis direction, as shown in fig. 7; determining the coordinate value of the point a where the first CCD camera 21 is located, and determining the coordinate value of the point E where the second CCD camera 22 is located (since the positions of the two CCD cameras are fixed, and the positions of the first background plate 31 and the second background plate 32 are fixed, the coordinate values of the points where the two CCD cameras are located can be determined); determining the abscissa position of the point of the first vertical reference line 41 on the horizontal section (point Z in fig. 7) and the ordinate position of the point of the second vertical reference line 42 on the horizontal section (point Q in fig. 7);
according to the abscissa position of the point (point Z in fig. 7) on the horizontal section (i.e., the horizontal section passing through the first CCD camera 21, the same below) of the first vertical reference line 41 and the first transverse distance BZ, determining the coordinate value of the first intersection point (point B in fig. 7) of the left tangent line of the bubble circle at the point a of the first CCD camera and the x-axis (because the first image, the second image and the real object are in equal proportion of 1: 1, the BZ length in fig. 7 is equal to the BZ length in fig. 6 and 9); in fig. 7, the circles represent the film bubble 8;
according to the abscissa position of the point (point Z in fig. 7) of the first vertical reference line 41 on the horizontal section and the second transverse distance CZ, determining a coordinate value of a second intersection point (point C in fig. 7) of the tangent line on the right side of the bubble circle of the point a where the first CCD camera is located and the x-axis (because the first image, the second image and the real object are in equal 1: 1 proportion, the CZ length in fig. 7 is equal to the CZ length in fig. 6 and 9);
according to the ordinate position of the point (point Q in fig. 7) of the second vertical reference line 42 on the horizontal section and the first longitudinal distance FQ, determining the coordinate value of a third intersection point (point F in fig. 7) of the tangent line at the front side of the bubble circle of the point E where the second CCD camera is located and the y axis (because the first image, the second image and the real object are in equal 1: 1 proportion, the FQ length in fig. 7 is equal to the FQ length in fig. 6 and 10);
according to the ordinate position of the point (point Q in fig. 7) of the second vertical reference line 42 on the horizontal section and the second longitudinal distance GQ, determining the coordinate value of the fourth intersection point (point G in fig. 7) of the tangent line at the rear side of the bubble circle of the point E where the second CCD camera is located and the y axis (because the first image, the second image and the real object are in equal 1: 1 proportion, the GQ length in fig. 7 is equal to the GQ length in fig. 6 and 10);
(a3) determining a coordinate equation of a first connecting line AB between a point (point A in fig. 7) where a first CCD camera is located and a first intersection point (point B in fig. 7), determining a coordinate equation of a second connecting line AC between the point (point A in fig. 7) where the first CCD camera is located and a second intersection point (point C in fig. 7), determining a coordinate equation of a third connecting line EF between a point (point E in fig. 7) where a second CCD camera is located and a third intersection point (point F in fig. 7), and determining a coordinate equation of a fourth connecting line EG between the point (point E in fig. 7) where the second CCD camera is located and a fourth intersection point (point G in fig. 7);
(a4) determining a coordinate equation of a first angle bisector AM between the first connecting line AB and the second connecting line AC, and determining a coordinate equation of a second angle bisector EN between the third connecting line EF and the fourth connecting line EG, as shown in FIG. 7;
(a5) determining the coordinate position of an intersection point K of the first angular bisector AM and the second angular bisector EN, wherein the intersection point K is the circle center of the bubble 8, calculating the distance between the circle center position of the bubble 8 and the first connecting line AB as shown in FIG. 7, and twice the distance is the actual diameter value of the bubble after the bubble is blown up and condensed;
(a6) the central controller regulates and controls the diameter of the bubble according to the actual value of the diameter of the bubble measured and calculated in the step (a 5), and when the actual value of the diameter of the bubble measured and calculated deviates from the target value, the central controller sends a command to the blower 14 or the exhaust fan 15 to regulate and control the internal air pressure of the bubble, so that the degree of the bubble inflation is changed to regulate the diameter;
(b) the actual condensation line position of the measurement and control film bubble 8 sequentially comprises the following steps (b 1) - (b 5):
(b1) in the first image 91, the width of the first bubble image 801 in each horizontal section is determined;
(b2) defining the vertical position of the condensation line in the first bubble image according to the following rules: the horizontal width at the condensation line of the first bubble image 801 is greater than the horizontal width of the first bubble image on each horizontal section below it and equal to the horizontal width of the first bubble image on each horizontal section above it; the absolute value of the vertical height difference H between the bubble condensate line image position in the first image (as indicated by the UW line in fig. 9) and the first fiducial position image 510 is determined, and the scale of the first image should be 1: 1, proportioning;
(b3) calculating a longitudinal horizontal distance m between the first CCD camera 21 and the center of the bubble according to the coordinate positions of the first CCD camera 21 and the center of the bubble, as shown in fig. 11, wherein the coordinate position of the center of the bubble is taken according to the calculation result of the substep (a 5), and the coordinate position of the first CCD camera 21 is taken according to the result of the substep (a 2);
(b4) and calculating the vertical position of the actual condensation line of the film bubble according to the following formula: the height difference value between the vertical position of the actual condensation line of the bubble and the vertical position of the first CCD camera 21 is H = -H x m/n, wherein H is the absolute value of the vertical height difference between the image position of the bubble condensation line in the first image and the first reference point image, and m is the longitudinal horizontal distance between the first CCD camera 21 and the center of the bubble; n is the longitudinal horizontal distance between the first CCD camera 21 and the first background plate 31, and the geometrical positional relationship thereof is shown in fig. 11; h is a negative value, indicating that the vertical position of the actual condensation line of the bubble is lower than that of the first CCD camera 21, as shown in fig. 9 and 11;
(b5) the central controller regulates and controls the vertical position of the actual condensation line of the film bubble according to the result obtained in the sub-step (b 4); if the vertical position of the actual condensation line of the film bubble is higher, the central controller commands the cooling air flow temperature control unit of the cooling air ring to act, so that the temperature of the cooling air flow blown out by the cooling air ring 11 is reduced, the condensation time of the film bubble 8 is shortened, and the vertical position of the actual condensation line of the film bubble 8 is reduced; on the contrary, if the vertical position of the actual condensation line of the film bubble 8 is lower, the central controller commands the cooling air flow temperature control unit of the cooling air 11 to act, so that the temperature of the cooling air flow blown out by the cooling air ring 11 is increased, the condensation time of the film bubble 8 is prolonged, and the vertical position of the actual condensation line of the film bubble 8 is increased;
(c) measuring and controlling the deflection degree of the film bubble: calculating the position of the center line (shown by the dotted line XY in fig. 9) of the first bubble image 801 in the first image 91 according to the left and right edge positions of the first bubble image 801 in the first image 91, and determining whether the bubble 8 has a shake deviation and a deviation amplitude in the transverse direction by referring to the position of the first vertical reference line image 410 in the first image according to the position of the center line of the first bubble image 801 in the first image 91 (i.e. determining the distance between the center line of the first bubble image 801 and the first vertical reference line image 410, if the distance is greater than a normal value, the bubble is deviated to the left, and if the distance is less than the normal value, the bubble is deviated to the right); the central controller commands the air suction pumps 73 corresponding to the second air suction plate 62 or the fourth air suction plate 64 to start according to the offset direction and the offset amplitude of the bubble 8 in the transverse direction (if the bubble is deviated to the left, the air suction pump 73 corresponding to the fourth air suction plate 64 is started, so that the bubble 8 correspondingly approaches to the direction close to the fourth air suction plate 64, thereby reducing the offset amplitude; if the bubble is deviated to the right, the air suction pump 73 corresponding to the second air suction plate 62 is started, so that the bubble 8 correspondingly approaches to the direction close to the second air suction plate 62, thereby reducing the offset amplitude);
from the front and back edge positions of the second bubble image 802 in the second image 92, the line position of the second bubble image 802 in the second image 92 is calculated, and from the line of the second bubble image 802 in the second image 92 (as shown by the dotted line X in fig. 10)1Y1Shown) position, and with reference to the position of the second vertical reference line image 420 in the second image 92, determine whether the bubble 8 has a deviation in the longitudinal direction and the deviation amplitude (i.e., determine the distance between the centerline of the first bubble image 802 and the second vertical reference line image 420, if the distance is greater than a normal value, the bubble is deviated backward, and if the distance is less than a normal value, the bubble is deviated forward); the central controller is based on the direction and magnitude of the deflection of the bubble in the longitudinal direction,commanding the suction pump corresponding to the first suction plate or the third suction plate to start (if the bubble 8 is forward, starting the suction pump 73 corresponding to the third suction plate 63, so that the bubble 8 is correspondingly closed to the direction close to the third suction plate 63, thereby reducing the offset amplitude; if the bubble is backward, starting the suction pump 73 corresponding to the first suction plate 61, so that the bubble 8 is correspondingly closed to the direction close to the first suction plate 61, thereby reducing the offset amplitude);
each of the above regulation processes comprises a step (a), a step (b), and a step (c), wherein the step (b) is after the step (a), and the step (c) is after the step (b). In the process of bubble production, the above regulation and control process can be repeated for many times.
Claims (2)
1. The accurate measurement and control equipment for the blown and condensed shape of the film bubble comprises an extrusion die head, wherein the extrusion die head is provided with a circular extrusion port for extruding the film bubble, a cooling air ring is arranged on the extrusion die head, and the central point of the cooling air ring and the central point of the circular extrusion port are both positioned on the vertical central axis of the extrusion die head;
the cooling air ring is matched with a cooling fan and a cooling air flow temperature control unit; the extrusion die head is also provided with a central controller, the central controller is connected to the cooling air flow temperature control unit, the extrusion die head is provided with an air inlet pipeline and an air outlet pipeline, the air inlet pipeline is connected with an air blower, the air outlet pipeline is connected with an exhaust fan, the inner end of the air inlet pipeline and the inner end of the air outlet pipeline are respectively opened in the central area of the upper surface of the extrusion die head, and the central controller is connected to the air blower and the exhaust fan; the method is characterized in that: two cameras are fixedly arranged above the cooling air ring and are respectively connected to the central controller; the vertical positions of the two cameras are the same, the vertical positions of the two cameras are close to and higher than the highest condensation position of the bubble, the two cameras are aligned to the vertical central axis of the extrusion die head, the orientation of the first camera is horizontal longitudinal direction, the orientation of the second camera is horizontal transverse direction, the orientations of the two cameras are mutually vertical, an upright first background plate is further arranged in the front direction of the first camera, an upright second background plate is further arranged in the front direction of the second camera, the horizontal projection extending direction of the first background plate is transverse direction, and the horizontal projection extending direction of the second background plate is longitudinal direction; the first camera and the first background plate are respectively positioned at the front and back opposite sides of the moving track of the bubble, and the second camera and the second background plate are respectively positioned at the left and right opposite sides of the moving track of the bubble;
a first vertical datum line and a first datum point which can be shot by a first camera and identified by a central controller are arranged on the first background plate, the vertical position of the first datum point is flush with the vertical position of the first camera, and the extending direction of the first vertical datum line is vertical;
a second vertical datum line and a second datum point which can be shot by a second camera and identified by the central controller are arranged on the second background plate, the vertical position of the second datum point is flush with the vertical position of the second camera, and the extending direction of the second vertical datum line is vertical;
four upright air suction plates are arranged beside the film bubble moving track and are respectively positioned in the front, back, left and right directions of the film bubble moving track, and the vertical position of each upright air suction plate is higher than the vertical positions of the two cameras; the plane of the first air suction plate and the plane of the third air suction plate are parallel to the first background plate, the first air suction plate and the third air suction plate are positioned at the front side and the rear side of the moving track of the bubble, the second air suction plate and the fourth air suction plate are positioned at the left side and the right side of the moving track of the bubble, and the plane of the second air suction plate and the plane of the fourth air suction plate are parallel to the second background plate; the surface of each air suction plate is provided with a plurality of air suction holes, a negative pressure chamber is arranged at the back of each air suction plate, the air suction holes of the air suction plates are communicated with the corresponding negative pressure chambers, and each negative pressure chamber is correspondingly connected with an air suction pump; the central controller is connected with each air suction pump.
2. A method for accurately measuring and controlling the bubble-blown condensation form, which is characterized in that the device for measuring and controlling the bubble-blown condensation form of claim 1 is adopted, in the measurement and control process, the film bubble is extruded by the circular ring-shaped extrusion port of the extrusion die head and then is continuously drawn to run upwards, vertically penetrates through the space between the first camera and the first background plate and the space between the second camera and the second background plate, then vertically penetrating through the space between the first suction plate and the third suction plate and the space between the second suction plate and the fourth suction plate, and utilizing a first camera to shoot the bubble and the first background plate to form a first image, wherein the image formed by the bubble in the first image is a first bubble image, the image formed by the first vertical reference line in the first image is a first vertical reference line image, and the image formed by the first reference point in the first image is a first reference point image;
the bubble and the second background plate are shot by a second camera to form a second image, the image formed by the bubble in the second image is a second bubble image, the image formed by the second vertical datum line in the second image is a second vertical datum line image, and the image formed by the second datum point in the second image is a second datum point image;
the central controller identifies a first image obtained by a first camera, and determines the left and right edge positions of a first bubble image, the position of a first vertical datum line image and the position of a first datum point image in the first image; the central controller identifies a second image obtained by the second camera, determines the front edge position and the rear edge position of a second bubble image, the position of a second vertical datum line image and the position of a second datum point image in the second image, measures and calculates the form of the bubble after blowing and condensation by using the first image and the second image, and then regulates and controls, wherein each regulation and control process comprises the following steps:
(a) measuring and controlling the diameter of the bubble after the bubble is blown and condensed, and sequentially comprising the following steps (a 1) to (a 6):
(a1) determining a first transverse distance between a left edge point of the first bubble image and the first vertical datum line image and a second transverse distance between a right edge point of the first bubble image and the first vertical datum line image on a horizontal transverse line passing through the first datum point image in the first image; in the second image, on a horizontal cross-section line passing through the second reference point image, determining a first longitudinal distance between the front edge point of the second bubble image and the second vertical reference line image, and determining a second longitudinal distance between the rear edge point of the second bubble image and the second vertical reference line image; when determining the values of the first and second lateral distances, the scale of the first image should be 1: 1, proportioning; when determining the numerical values of the first longitudinal distance and the second longitudinal distance, the proportion of the second image should be 1: 1, proportioning;
(a2) establishing a coordinate system on a horizontal section where the first camera is located, wherein the intersection point of extension lines of the first background plate and the second background plate on the horizontal section is taken as an origin, the extension direction of the first background plate on the horizontal section is taken as an x-axis direction, and the extension direction of the second background plate on the horizontal section is taken as a y-axis direction; determining a coordinate value of a point A where a first CCD camera is located, and determining a coordinate value of a point E where a second CCD camera is located; determining the abscissa position of the point of the first vertical datum line on the horizontal section and the ordinate position of the point of the second vertical datum line on the horizontal section;
according to the abscissa position of the point of the first vertical datum line on the horizontal section and the first transverse distance, determining a coordinate value of a first intersection point of a left tangent of a bubble circle at the point A of the first CCD camera and the x axis;
according to the abscissa position of the point of the first vertical datum line on the horizontal section and the second transverse distance, determining a coordinate value of a second intersection point of the right tangent of the bubble circle at the point A of the first CCD camera and the x axis;
according to the vertical coordinate position of the point of the second vertical datum line on the horizontal section and the first longitudinal distance, determining the coordinate value of a third intersection point of the tangent line at the front side of the bubble circle of the point E where the second CCD camera is located and the y axis;
according to the vertical coordinate position of the point of the second vertical datum line on the horizontal section and the second longitudinal distance, determining the coordinate value of a fourth intersection point of the rear tangent line of the bubble circle at the point E of the second CCD camera and the y axis;
(a3) determining a coordinate equation of a first connecting line between a point A where a first camera is located and the first intersection point, determining a coordinate equation of a second connecting line between the point A where the first camera is located and the second intersection point, determining a coordinate equation of a third connecting line between a point E where a second camera is located and the third intersection point, and determining a coordinate equation of a fourth connecting line between the point E where the second camera is located and the fourth intersection point;
(a4) determining a coordinate equation of a first angle bisector between the first connecting line and the second connecting line, and determining a coordinate equation of a second angle bisector between the third connecting line and the fourth connecting line;
(a5) determining the coordinate position of the intersection point of the first angular bisector and the second angular bisector, wherein the intersection point is the circle center of the bubble, calculating the distance between the circle center position of the bubble and the first connecting line, and twice the distance is the actual diameter value of the bubble after the bubble is blown and condensed;
(a6) the central controller regulates and controls the diameter of the bubble according to the actual value of the diameter of the bubble measured and calculated in the step (a 5), and when the actual value of the diameter of the bubble measured and calculated deviates from the target value, the central controller sends a command to the blower or the exhaust fan to regulate and control the internal air pressure of the bubble, so that the degree of inflation of the bubble is changed to regulate the diameter;
(b) the method for measuring and controlling the actual condensation line position of the bubble sequentially comprises the following steps (b 1) - (b 5):
(b1) determining the width of the first bubble image on each horizontal section in the first image;
(b2) defining the vertical position of the condensation line in the first bubble image according to the following rules: the horizontal width of the condensation line of the first bubble image is larger than the horizontal width of the first bubble image on each horizontal section below the condensation line and is equal to the horizontal width of the first bubble image on each horizontal section above the condensation line; and determining the absolute value H of the vertical height difference between the position of the film bubble condensation line image in the first image and the position image of the first datum point, wherein when the absolute value H of the vertical height difference is determined, the proportion of the first image is 1: 1, proportioning;
(b3) calculating a longitudinal horizontal distance m between the first camera and the center of the bubble according to the coordinate positions of the first camera and the center of the bubble, wherein the coordinate position of the center of the bubble is taken according to the calculation result of the substep (a 5), and the coordinate position of the first camera is taken according to the result of the substep (a 2);
(b4) and calculating the vertical position of the actual condensation line of the film bubble according to the following formula: the height difference value between the vertical position of the actual condensation line of the bubble and the vertical position of the first camera is H = -H multiplied by m/n, wherein H is the absolute value of the vertical height difference between the image position of the bubble condensation line in the first image and the first reference point image, and m is the longitudinal horizontal distance between the first camera and the center of the bubble; n is the longitudinal horizontal distance between the first camera and the first background plate; h is a negative value, which indicates that the actual condensation line of the film bubble is lower than the vertical position of the first camera;
(b5) the central controller regulates and controls the vertical position of the actual condensation line of the film bubble according to the result obtained in the sub-step (b 4); if the vertical position of the actual condensation line of the film bubble is higher, the central controller commands the cooling air flow temperature control unit of the cooling air ring to act, so that the temperature of the cooling air flow blown out by the cooling air ring is reduced, the condensation time of the film bubble is shortened, and the vertical position of the actual condensation line of the film bubble is reduced; on the contrary, if the vertical position of the actual condensation line of the film bubble is lower, the central controller commands the cooling air flow temperature control unit of the cooling air ring to act, so that the temperature of the cooling air flow blown out by the cooling air ring is increased, the condensation time of the film bubble is prolonged, and the vertical position of the actual condensation line of the film bubble is increased;
(c) measuring and controlling the deflection degree of the film bubble: calculating the center line position of a first bubble image in the first image according to the left and right edge positions of the first bubble image in the first image, and judging whether the bubble has shake deviation and deviation amplitude in the transverse direction or not according to the center line position of the first bubble image in the first image and the position of a first vertical reference line image in the first image; the central controller commands the air suction pump corresponding to the second air suction plate or the fourth air suction plate to start according to the offset direction and the offset amplitude of the film bubble in the transverse direction, so that the film bubble is correspondingly close to the direction close to the second air suction plate or the fourth air suction plate, and the offset amplitude is reduced;
calculating the center line position of a second bubble image in the second image according to the front edge position and the rear edge position of the second bubble image in the second image, and judging whether the bubble has offset in the longitudinal direction and the offset amplitude according to the center line position of the second bubble image in the second image and the position of a second vertical reference line image in the second image; the central controller commands the air suction pump corresponding to the first air suction plate or the third air suction plate to start according to the offset direction and the offset amplitude of the bubble in the longitudinal direction, so that the bubble is correspondingly close to the direction close to the first air suction plate or the third air suction plate, and the offset amplitude is reduced;
the above step (b) is followed by the step (a), and the step (c) is followed by the step (b).
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| CN204869636U (en) * | 2015-08-20 | 2015-12-16 | 广东金明精机股份有限公司 | Inflation film manufacturing machine membrane base form adjusting device |
| CN109263029A (en) * | 2018-09-03 | 2019-01-25 | 广东金明精机股份有限公司 | Inflation film manufacturing machine vesicle diameter regulation device and regulation method |
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