CN111361118A - Rotary traction film blowing production process - Google Patents
Rotary traction film blowing production process Download PDFInfo
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- CN111361118A CN111361118A CN202010154693.5A CN202010154693A CN111361118A CN 111361118 A CN111361118 A CN 111361118A CN 202010154693 A CN202010154693 A CN 202010154693A CN 111361118 A CN111361118 A CN 111361118A
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- guide roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/355—Conveyors for extruded articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
In the rotary traction process, the rotating speed of a bidirectional motor is gradually reduced along with the increase of an included angle between the central axis of a fourth horizontal movable guide roller and a reference direction, and the rotating speed of the bidirectional motor is increased along with the reduction of the numerical value of the included angle; when the included angle value is zero, the rotating speed of the bidirectional motor reaches the maximum value; the central controller also controls the output wind speed of the variable frequency fan at each moment according to the size of an included angle between the central axis of the fourth horizontal movable guide roller and the reference direction. The invention can reduce the problems of scratching and pulling of the film, and the finally rolled film roll is more compact and has more regular edges.
Description
Technical Field
The invention belongs to the technical field of plastic film production processes, and particularly relates to a rotary traction film blowing production process.
Background
When traditional inflation film manufacturing machine produced, the plastics raw materials melts the back and is extruded by the ring shape extrusion orifice of die head, forms cylindric bubble, then draws the clamp roller and flattens the bubble into double-deck film, and the fixed deflector roll of level is walked around to double-deck film, is rolled up by the rolling axle at last, and the installation direction of the fixed deflector roll of level is on a parallel with the central axis of rolling axle.
However, due to reasons of mechanical design, mechanical structure, machining, etc., the thickness of each point of the cylindrical bubble extruded from the circular extrusion port of the film blowing apparatus is different, for example, the thickness of the bubble in the corresponding direction of the injection port is obviously thicker, and the thickness deviation belongs to a systematic error, that is, if the point in a certain direction of the bubble is thicker, the subsequent bubble is continuously thicker in the certain direction, whereas if the point in a certain direction of the bubble is thinner, the subsequent bubble is continuously thinner in the certain direction, so that the thick points (or referred to as bumps) of the film wound in the above conventional manner are gradually accumulated and superposed at the same position of the roll if not processed, so that the thickness of the wound roll is seriously uneven, a rib popping phenomenon is generated, and the winding quality is poor.
In order to overcome the above disadvantages, a rotary traction device is designed, for example, the structure shown in CN203331410U chinese utility model patent, which can make the traction nip roller rotate around the central axis of the circular extrusion port (the central axis s of the circular extrusion port theoretically overlaps with the central axis of the film bubble), so that the distribution position of the thin film thickness points on the coiled material presents a wave distribution state, and the thin film thickness points are dispersed along the axial direction of the coiled material, thereby better solving the rolling accumulation problem caused by the systematic error of the thickness and the thin film, making the thin film thickness points be uniformly distributed in the axial direction of the coiled material, not being accumulated in the same position, and achieving the purpose of leveling the coiled material.
In the above-mentioned rotary drawing structure disclosed in CN203331410U, in order to stably transfer the film on the continuously rotating drawing nip roller to the stationary horizontal fixed guide roller, it is usually necessary to further provide a first horizontal movable guide roller 31, a second horizontal movable guide roller 32, a third horizontal movable guide roller 33, and a fourth horizontal movable guide roller 34 between the drawing nip roller 30 and the horizontal fixed guide roller, and the vertical distances between the vertical positions of the fourth horizontal movable guide roller 34, the third horizontal movable guide roller 33, the second horizontal movable guide roller 32, and the first horizontal movable guide roller 31 and the drawing nip roller 30 are sequentially increased when viewed from the vertical position, wherein the horizontal positions of the first horizontal movable guide roller and the third horizontal movable guide roller are far from the central axis of the circular extrusion opening, and the horizontal positions of the second horizontal movable guide roller and the fourth horizontal movable guide roller are close to the central axis of the circular extrusion opening, as shown in fig. 1; two ends of a first horizontal movable guide roller 31 are arranged on a first guide roller bracket 41, two ends of a second horizontal movable guide roller 32 are arranged on a second guide roller bracket 42, two ends of a third horizontal movable guide roller 33 are arranged on a third guide roller bracket 43, two ends of a fourth horizontal movable guide roller 34 are arranged on a fourth guide roller bracket 44, a gear transmission mechanism 6 is used for driving the traction clamping roller 30, the first guide roller bracket 41, the second guide roller bracket 42, the third guide roller bracket 43 and the fourth guide roller bracket 44 to rotate back and forth around the central axis s of the circular extrusion opening at a constant speed, the first guide roller bracket, the second guide roller bracket, the third guide roller bracket and the fourth guide roller bracket correspondingly drive the first horizontal movable guide roller 31, the second horizontal movable guide roller 32, the third horizontal movable guide roller 33 and the fourth horizontal movable guide roller 34 to rotate back and forth around the central axis s of the circular extrusion opening at a constant speed, wherein the traction clamping roller 30 and the first horizontal movable guide roller 31 rotate synchronously, the rotating angles of the first horizontally movable guide roller 31, the second horizontally movable guide roller 32, the third horizontally movable guide roller 33 and the fourth horizontally movable guide roller 34 are 4:3:2:1, when the first horizontally movable guide roller is parallel to the horizontally fixed guide roller, the second horizontally movable guide roller, the third horizontally movable guide roller and the fourth horizontally movable guide roller are parallel to the horizontally fixed guide roller, and the direction of the central axis of the fourth horizontally movable guide roller is called as a reference direction. When the deviation direction of the fourth horizontal movable guide roller from the reference direction reaches a set value, the fourth guide roller bracket 44 touches a travel switch, the travel switch sends a signal, the gear transmission mechanism 6 moves reversely, and the first horizontal movable guide roller 31, the second horizontal movable guide roller 32, the third horizontal movable guide roller 33 and the fourth horizontal movable guide roller 34 rotate reversely around the central axis of the circular extrusion opening
When the plastic film winding machine works, after passing through the traction clamping roller, the plastic film sequentially bypasses the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller and reaches the horizontal fixed guide roller, and no matter what angle the traction clamping roller rotates, the plastic film winding machine successfully realizes winding due to the folding effect of the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller, and when the plastic film theoretically reaches the horizontal fixed guide roller, the conveying direction of the plastic film is perpendicular to the horizontal fixed guide roller. For example, in fig. 2, the bubble 20 is flattened into the double-layer plastic film 2 by the drawing nip roller 30, and when each horizontally movable guide roller rotates by 0 °, the double-layer plastic film 2 reaches the horizontally fixed guide roller 35, and the running direction of the double-layer plastic film is vertical to the horizontally fixed guide roller 35; for another example, in fig. 3, when the first horizontally movable guide roller 31 rotates 180 °, the plastic film passes through the pulling nip roller, then passes around the first horizontally movable guide roller 31, becomes a segment of the plastic film abcd in fig. 3 (running rightward in the drawing plane of fig. 3), then passes around the second horizontally movable guide roller 32, becomes a segment of the plastic film cdfe in fig. 3 (running upward in the drawing plane of fig. 3), then passes around the third horizontally movable guide roller 33, becomes a segment of the plastic film efhg in fig. 3 (running downward in the drawing plane of fig. 3), and then passes around the fourth horizontally movable guide roller 34, becomes a segment of the plastic film ghmn in fig. 3 (running rightward in the drawing plane of fig. 3). As can be seen from fig. 3, the ghmn section of the plastic film, when it reaches the horizontal stationary guide roller 35, also travels in a direction perpendicular to the horizontal stationary guide roller 35.
However, in the process that the horizontal movable guide rollers continuously twist back and forth around the central axis of the circular extrusion opening, the surfaces of the film and the horizontal movable guide rollers can twist relatively and twist relatively. For example, in fig. 4, when the second horizontally movable guide roller 32 rotates counterclockwise around the central axis of the circular extrusion opening (the horizontal projection position is shown as S in fig. 4) during the rotating and drawing process, the M point of the second horizontally movable guide roller 32 will move leftward (shown as arrow v in fig. 4) relative to the film 2, the N point of the second horizontally movable guide roller 32 will move rightward (shown as arrow k in fig. 4) relative to the film 2, and only the middle point (point Q) of the second horizontally movable guide roller 32 will not move relative to the film 2. The method is obviously different from the common guide roller, the rotating linear speed of each point on the surface of the common guide roller is just equal to the running speed of the film, so that no relative twisting occurs between the common guide roller and the film.
Because the surface of the film in the rotary traction process and the surface of the horizontal movable guide roller can generate relative rubbing movement, the film is just extruded at the moment, and the physical performance is not stable yet, the film is easy to be irregularly pulled or scratched in the twisting process of the rotary traction, and particularly when the horizontal movable guide roller deviates from the reference direction by a large angle, the film is more easy to be pulled or scratched, and the reasons are as follows: although each horizontal movable guide roller rotates around the central axis S of the circular extrusion opening at a constant speed in the rotating and drawing process, the relative twisting speed between the horizontal movable guide roller and the film is not constant in the constant-speed rotating process, but is smaller when the horizontal movable guide roller is closer to the reference direction; when the angle of the horizontal movable guide roller deviating from the reference direction is larger, the relative twisting speed between the horizontal movable guide roller and the film is larger, and the twisting degree is more violent. Thus, when the horizontal movable guide roller deviates from the reference direction by a larger angle, the destructive power for pulling and scratching the film is stronger. On the other hand, the above twisting process is a back and forth rotation, and when the motor suddenly changes direction (for short, reversing), the film is more easily damaged.
In order to reduce the degree of the strain or scratch, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller are designed into air cushion rollers, small air holes are arranged on the surfaces of the air cushion rollers, and a fan for conveying air to the air cushion rollers is also arranged The third horizontal movable guide roller and the fourth horizontal movable guide roller are shifted in the axial direction and cannot be flattened all the time (flattening along the axial direction of the guide roller), so that the finally rolled film roll is not compact and has irregular edges (commonly called as edge swinging in the row).
Disclosure of Invention
The invention aims to overcome the defects and provide a rotary traction film blowing production process, which can reduce the problems of scratching and pulling of a film and ensure that a finally wound film roll is denser and has more tidy edges.
The purpose can be realized according to the following scheme: a rotary traction film blowing production process adopts rotary traction film blowing production equipment which is provided with a central controller and an extrusion die head, wherein the extrusion die head is provided with a circular extrusion port, two traction clamping rollers, a first horizontal movable guide roller, a second horizontal movable guide roller, a third horizontal movable guide roller and a fourth horizontal movable guide roller are sequentially arranged above or below the extrusion die head, the horizontal positions of the first horizontal movable guide roller and the third horizontal movable guide roller are far away from the central axis of the circular extrusion port, the horizontal positions of the second horizontal movable guide roller and the fourth horizontal movable guide roller are close to the central axis of the circular extrusion port, the downstream of the fourth horizontal movable guide roller is also provided with a horizontal fixed guide roller, the downstream of the horizontal fixed guide roller is also provided with a winding shaft, and the installation direction of the horizontal fixed guide roller is parallel to the winding shaft;
the vertical distances between the traction pinch roll, the first horizontal movable guide roll, the second horizontal movable guide roll, the third horizontal movable guide roll and the fourth horizontal movable guide roll and the circular ring-shaped extrusion opening are sequentially increased; the traction clamping roller and the first horizontal movable guide roller are arranged on the first bracket, the second horizontal movable guide roller is arranged on the second bracket, the third horizontal movable guide roller is arranged on the third bracket, and the fourth horizontal movable guide roller is arranged on the fourth bracket; the first support, the second support, the third support and the fourth support can horizontally rotate around the central axis of the circular extrusion port; the bidirectional motor is also arranged for driving the first support to horizontally rotate around the central axis of the circular extrusion port, a speed reduction transmission mechanism is arranged between the first support and the second support, between the first support and the fourth support, between the second support and the third support, between the third support and between the fourth support, and the rotation angle of the first support, the rotation angle of the second support, the rotation angle of the third support and the rotation angle of the fourth support are kept to be 4:3:2:1; the adopted second horizontal movable guide roller, third horizontal movable guide roller and fourth horizontal movable guide roller are air cushion rollers, small air holes are formed in the surfaces of the air cushion rollers, and a fan for conveying air to the air cushion rollers is further arranged;
the method comprises the following steps: the circular extrusion port of the extrusion die head continuously extrudes circular film bubbles, the film bubbles pass through the space between the two traction clamping rollers, and the circular film bubbles are flattened by the two traction clamping rollers and folded into a double-layer plastic film; then the double-layer plastic film sequentially bypasses the traction pinch roller, the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller to reach the horizontal fixed guide roller, and when the double-layer plastic film reaches the horizontal fixed guide roller, the running direction of the double-layer plastic film is vertical to the horizontal fixed guide roller; after reaching the horizontal fixed guide roller, the double-layer plastic film continues to run and is finally wound by a winding shaft;
in the process, the bidirectional motor drives the first support, the second support, the third support and the fourth support to periodically rotate back and forth around the central axis of the circular extrusion opening, the traction nip roller, the first horizontal movable guide roller and the first support synchronously periodically rotate back and forth, the second horizontal movable guide roller and the second support synchronously periodically rotate back and forth, the third horizontal movable guide roller and the third support synchronously periodically rotate back and forth, and the fourth horizontal movable guide roller and the fourth support synchronously periodically rotate back and forth, wherein the rotating angle of the first horizontal movable guide roller and the traction nip roller is kept to be 1:1, and the rotating angle of the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller is kept to be 4:3:2:1; when the first horizontal movable guide roller is parallel to the horizontal fixed guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller are also parallel to the horizontal fixed guide roller, and the direction of the central axis of the fourth horizontal movable guide roller is called as a reference direction;
the method is characterized in that: the rotating shaft of the adopted bidirectional motor is also connected in series with a rotary encoder, and the rotary encoder is connected to a central controller; the adopted fan is a variable frequency fan; the adopted bidirectional motor is a variable frequency motor; the central controller is connected to the variable frequency fan and the bidirectional motor;
in the process, the rotary encoder continuously measures the rotation angle of the rotating shaft of the bidirectional motor and feeds a signal back to the central controller, and the central controller calculates the rotation angle of the fourth horizontal movable guide roller around the central axis of the circular extrusion port at each moment according to the detection result of the rotary encoder, and further calculates the included angle between the central axis of the fourth horizontal movable guide roller and the reference direction at each moment; when the included angle between the fourth horizontal movable guide roller and the reference direction reaches 45 degrees, the central controller commands the bidirectional motor to change the rotating direction, the rotating directions of the first support, the second support, the third support and the fourth support around the central axis of the circular ring extrusion opening are changed along with the change of the rotating directions, and the rotating directions of the traction clamping roller, the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller around the central axis of the circular ring extrusion opening are changed along with the change of the rotating directions;
in the process, the central controller controls the rotating speed of the bidirectional motor at each moment according to the following rule according to the size of an included angle between the central axis of the fourth horizontal movable guide roller and the reference direction: the rotating speed of the bidirectional motor is gradually reduced along with the increase of the numerical value of the included angle, and the rotating speed of the bidirectional motor is increased along with the reduction of the numerical value of the included angle; when the included angle value is zero, the rotating speed of the bidirectional motor reaches the maximum value;
the central controller also controls the output wind speed of the variable frequency fan at each moment according to the following rules according to the size of an included angle between the central axis of the fourth horizontal movable guide roller and the reference direction: when the included angle is smaller than a set value ⍬, the output wind speed of the variable frequency fan is zero; when the included angle is larger than a set value ⍬, the output wind speed of the variable frequency fan increases along with the increase of the included angle value and decreases along with the decrease of the included angle value; the value range of the set value ⍬ of the included angle is 6-12 degrees, namely ⍬ is more than or equal to 6 degrees and less than or equal to 12 degrees.
The numerical value of the included angle between the central axis of the fourth horizontally movable guide roller and the reference direction refers to the absolute value of the included angle, and does not consider the positive and negative directions (do not consider the clockwise and anticlockwise directions).
Downstream is defined as the direction of travel of the film, which is from upstream to downstream.
The invention has the following advantages and effects:
firstly, when the numerical value of the included angle is less than a set value ⍬, the staggered included angle between the central axes of the horizontal movable guide rollers is very small, the adjacent guide rollers are basically close to parallel, the twisting speed of the surface of the film and the surface of the horizontal movable guide roller is relatively small, and the twisting degree is not violent, so that the risk of scratching or pulling the film at the stage is relatively low, the invention uses the time machine to pause the work of the variable frequency fan, so that the film can be tightly attached to the surface of each horizontal movable guide roller at the time, the film is periodically flattened (i.e. flattened along the axial direction of the guide roller), and the position of the film along the axial direction of the horizontal movable guide roller is subjected to one-time regression (because when the included angle is equal to 0, the axial component force of the stretched horizontal guide roller of the film is zero, the air speed of the air cushion roller is zero, and the axial position deviation of the film, the edges of the two ends of the finally wound film roll are tidy, and the film roll is compact;
when the included angle between the central axis of the fourth horizontal movable guide roller and the reference direction is smaller, the staggered included angle between the central axes of the horizontal movable guide rollers is smaller, the rubbing speed of the film and the surface of the horizontal movable guide roller is low, and the damage force to the film is lower;
when the included angle between the central axis of the fourth horizontal movable guide roller and the reference direction is larger, the rotating speed of the bidirectional motor is automatically reduced, and the rotating speed of each horizontal movable guide roller around the central axis of the circular extrusion opening is reduced, so that the relative speed of the film and the surface rubbing of the horizontal movable guide rollers is reduced in this way, and the risk that the film is scratched or pulled is reduced; especially, when the included angle is close to the maximum value (close to reversing), the rotating speed of each horizontal movable guide roller around the central axis of the circular extrusion opening is very small, so that the film is slowly and gently rubbed in the reversing process, and the risk of pulling and scratching the film in the reversing process is reduced.
Drawings
Fig. 1 is a schematic structural view of a rotary traction mechanism of a film blowing machine used in the conventional structure and the present invention.
Fig. 2 is a schematic view of the structure shown in fig. 1 in a use state when the fourth horizontally movable guide roller rotates around the central axis of the circular extrusion opening by an angle of 0 °.
Fig. 3 is a schematic view of the structure shown in fig. 1 in a use state when the fourth horizontally movable guide roller rotates around the central axis of the circular extrusion opening by an angle of 45 °.
FIG. 4 is a schematic illustration of the relative rubbing of the film surface with the horizontally movable guide roller surface during rotational drawing.
Detailed Description
A rotary traction film blowing production process adopts rotary traction film blowing production equipment which is provided with a central controller and an extrusion die head, wherein the extrusion die head is provided with a circular extrusion port 11, a traction pinch roll 30, a first horizontal movable guide roll 31, a second horizontal movable guide roll 32, a third horizontal movable guide roll 33 and a fourth horizontal movable guide roll 34 are sequentially arranged above the extrusion die head 11, wherein the horizontal positions of the first horizontal movable guide roller 31 and the third horizontal movable guide roller 33 are far away from the vertical central axis S of the circular extrusion opening 11, the horizontal positions of the second horizontal movable guide roller 32 and the fourth horizontal movable guide roller 34 are close to the central axis S of the circular extrusion opening, a horizontal fixed guide roller 35 is further arranged at the downstream of the fourth horizontal movable guide roller 34, a winding shaft is further arranged at the downstream of the horizontal fixed guide roller 35, and the installation direction of the horizontal fixed guide roller 35 is parallel to the winding shaft; the vertical distances between the traction pinch roller 30, the first horizontal movable guide roller 31, the second horizontal movable guide roller 32, the third horizontal movable guide roller 33, the fourth horizontal movable guide roller 34 and the circular extrusion port 11 are sequentially increased; the traction nip roller 30 and the first horizontally movable guide roller 31 are installed on a first bracket 41, the second horizontally movable guide roller 32 is installed on a second bracket 42, the third horizontally movable guide roller 33 is installed on a third bracket 43, and the fourth horizontally movable guide roller 34 is installed on a fourth bracket 44; the first support, the second support, the third support and the fourth support can horizontally rotate around the central axis S of the circular extrusion port; the two-way motor is used for driving the first support to horizontally rotate around the central axis of the circular extrusion opening, and the adopted two-way motor is a variable frequency motor; a speed reduction transmission mechanism 6 is arranged between the first support and the second support, and between the third support and the fourth support, and the rotation angles of the first support 41, the second support 42, the third support 43 and the fourth support 44 are kept at a ratio of 4:3:2:1, as shown in fig. 1; the rotating shaft of the bidirectional motor is also connected in series with a rotary encoder, and the rotary encoder is connected to the central controller; the adopted second horizontal movable guide roller 21, third horizontal movable guide roller 31 and fourth horizontal movable guide roller 41 are air cushion rollers, small air holes are arranged on the surfaces of the air cushion rollers, and a variable frequency fan for conveying air to the air cushion rollers is also arranged; the central controller is connected to the variable frequency fan and the variable frequency motor (namely, the bidirectional motor);
the production process comprises the following steps: the circular extrusion port 11 of the extrusion die head continuously extrudes the circular film bubble 20, the film bubble 20 runs between two traction clamping rollers 30, the circular film bubble 20 is flattened by the two traction clamping rollers 30 and is folded into a double-layer plastic film 2, then the double-layer plastic film 2 sequentially bypasses the traction clamping rollers 30, a first horizontal movable guide roller 31, a second horizontal movable guide roller 32, a third horizontal movable guide roller 33 and a fourth horizontal movable guide roller 34 and reaches a horizontal fixed guide roller 35, and when the double-layer plastic film 2 reaches the horizontal fixed guide roller 35, the running direction of the double-layer plastic film is vertical to the horizontal fixed guide roller 35; the double-layer plastic film 2 continues to run after reaching the horizontal fixed guide roller, and is finally wound by a winding shaft;
in the process of the steps, the bidirectional motor drives the first support 42, the second support 42, the third support 43 and the fourth support 44 to periodically rotate back and forth around the central axis S of the circular extrusion opening, the traction pinch roller 30, the first horizontal movable guide roller 31 and the first support 41 synchronously periodically rotate back and forth, the second horizontal movable guide roller 32 and the second support 42 synchronously periodically rotate back and forth, the third horizontal movable guide roller 33 and the third support 43 synchronously periodically rotate back and forth, and the fourth horizontal movable guide roller 34 and the fourth support 44 synchronously periodically rotate back and forth, wherein the rotating angle of the first horizontal movable guide roller 31 and the traction pinch roller 30 is kept to be 1:1, and the rotating angle of the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller is kept to be 4:3:2:1; when the first horizontally movable guide roller 31 is parallel to the horizontally fixed guide roller 35, the second horizontally movable guide roller 32, the third horizontally movable guide roller 33 and the fourth horizontally movable guide roller 34 are also parallel to the horizontally fixed guide roller 35, and the direction of the central axis of the fourth horizontally movable guide roller 34 is called as a reference direction;
in the process of the steps, the rotary encoder continuously measures the rotation angle of the rotating shaft of the bidirectional motor, and feeds a signal back to the central controller, and the central controller calculates the rotation angle of the fourth horizontal movable guide roller 34 around the central axis S of the circular extrusion port at each moment according to the detection result of the rotary encoder, and further calculates the included angle between the central axis S of the fourth horizontal movable guide roller and the reference direction at each moment; when the included angle between the fourth horizontal movable guide roller 34 and the reference direction reaches 45 degrees, the central controller commands the bidirectional motor to change the rotating direction, the rotating direction of the first bracket 31, the second bracket 32, the third bracket 33 and the fourth bracket 34 around the central axis S of the circular extrusion opening is changed along with the change of the rotating direction, and the rotating direction of the traction clamping roller 30, the first horizontal movable guide roller 31, the second horizontal movable guide roller 32, the third horizontal movable guide roller 33 and the fourth horizontal movable guide roller 34 around the central axis S of the circular extrusion opening is changed along with the change of the rotating direction;
during the above steps, the central controller controls the rotation speed of the bidirectional motor at each moment according to the following rule according to the size of the included angle between the central axis 34 of the fourth horizontally movable guide roller and the reference direction: the rotating speed of the bidirectional motor is gradually reduced along with the increase of the numerical value of the included angle, and the rotating speed of the bidirectional motor is increased along with the reduction of the numerical value of the included angle; when the included angle value is zero, the rotating speed of the bidirectional motor reaches the maximum value;
in the process of the above steps, the central controller further controls the output wind speed of the variable frequency fan at each moment according to the following rule according to the size of an included angle between the central axis of the fourth horizontal movable guide roller and the reference direction: when the included angle is smaller than a set value ⍬ (⍬ =8 °), the output wind speed of the variable frequency fan is zero; when the included angle is larger than a set value ⍬ (⍬ =8 °), the output wind speed of the variable frequency fan increases with the increase of the included angle value and decreases with the decrease of the included angle value.
The numerical value of the included angle between the central axis of the fourth horizontally movable guide roller and the reference direction is the absolute value of the included angle, and the positive and negative directions (the clockwise and anticlockwise directions are not considered) are not considered, so that the fourth horizontally movable guide roller continuously rotates by 16 degrees, namely, the clockwise 8-degree range and the anticlockwise 8-degree range in the process that the output wind speed of the variable frequency fan is zero each time.
In the above embodiment, the setting value ⍬ of the included angle between the central axis of the fourth horizontally movable guide roller and the reference direction may be changed to 6 °, or to 12 °.
In the above embodiment, the pulling nip roller 30, the first horizontally movable guide roller 31, the second horizontally movable guide roller 32, the third horizontally movable guide roller 33, and the fourth horizontally movable guide roller 34 may be disposed below the extrusion die 11 instead, i.e., in a down-blowing manner.
Claims (2)
1. A rotary traction film blowing production process adopts rotary traction film blowing production equipment which is provided with a central controller and an extrusion die head, wherein the extrusion die head is provided with a circular extrusion port, two traction clamping rollers, a first horizontal movable guide roller, a second horizontal movable guide roller, a third horizontal movable guide roller and a fourth horizontal movable guide roller are sequentially arranged above or below the extrusion die head, wherein the horizontal positions of the first horizontal movable guide roller and the third horizontal movable guide roller are far away from the central axis of the circular extrusion opening, the horizontal positions of the second horizontal movable guide roller and the fourth horizontal movable guide roller are close to the central axis of the circular extrusion port, a horizontal fixed guide roller is further arranged at the downstream of the fourth horizontal movable guide roller, a winding shaft is further arranged at the downstream of the horizontal fixed guide roller, and the installation direction of the horizontal fixed guide roller is parallel to the winding shaft;
the vertical distances between the traction pinch roll, the first horizontal movable guide roll, the second horizontal movable guide roll, the third horizontal movable guide roll and the fourth horizontal movable guide roll and the circular ring-shaped extrusion opening are sequentially increased; the traction clamping roller and the first horizontal movable guide roller are arranged on the first bracket, the second horizontal movable guide roller is arranged on the second bracket, the third horizontal movable guide roller is arranged on the third bracket, and the fourth horizontal movable guide roller is arranged on the fourth bracket; the first support, the second support, the third support and the fourth support can horizontally rotate around the central axis of the circular extrusion port; the bidirectional motor is also arranged for driving the first support to horizontally rotate around the central axis of the circular extrusion port, a speed reduction transmission mechanism is arranged between the first support and the second support, between the first support and the fourth support, between the second support and the third support, between the third support and between the fourth support, and the rotation angle of the first support, the rotation angle of the second support, the rotation angle of the third support and the rotation angle of the fourth support are kept to be 4:3:2:1; the adopted second horizontal movable guide roller, third horizontal movable guide roller and fourth horizontal movable guide roller are air cushion rollers, small air holes are formed in the surfaces of the air cushion rollers, and a fan for conveying air to the air cushion rollers is further arranged;
the method comprises the following steps: the circular extrusion port of the extrusion die head continuously extrudes circular film bubbles, the film bubbles pass through the space between the two traction clamping rollers, and the circular film bubbles are flattened by the two traction clamping rollers and folded into a double-layer plastic film; then the double-layer plastic film sequentially bypasses the traction pinch roller, the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller to reach the horizontal fixed guide roller, and when the double-layer plastic film reaches the horizontal fixed guide roller, the running direction of the double-layer plastic film is vertical to the horizontal fixed guide roller; after reaching the horizontal fixed guide roller, the double-layer plastic film continues to run and is finally wound by a winding shaft;
in the process of the steps, a bidirectional motor drives a first support, a second support, a third support and a fourth support to periodically rotate back and forth around the central axis of the circular extrusion opening, a traction clamping roller, a first horizontal movable guide roller and the first support synchronously periodically rotate back and forth, a second horizontal movable guide roller and the second support synchronously periodically rotate back and forth, a third horizontal movable guide roller and the third support synchronously periodically rotate back and forth, and a fourth horizontal movable guide roller and the fourth support synchronously periodically rotate back and forth, wherein the rotating angle of the first horizontal movable guide roller and the traction clamping roller is kept to be 1:1, and the rotating angle of the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller is kept to be 4:3:2:1; when the first horizontal movable guide roller is parallel to the horizontal fixed guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller are also parallel to the horizontal fixed guide roller, and the direction of the central axis of the fourth horizontal movable guide roller is called as a reference direction;
the method is characterized in that: the rotating shaft of the adopted bidirectional motor is also connected in series with a rotary encoder, and the rotary encoder is connected to a central controller; the adopted fan is a variable frequency fan; the adopted bidirectional motor is a variable frequency motor; the central controller is connected to the variable frequency fan and the bidirectional motor;
in the process of the steps, the rotary encoder continuously measures the rotation angle of the rotating shaft of the bidirectional motor and feeds a signal back to the central controller, and the central controller calculates the rotation angle of the fourth horizontal movable guide roller around the central axis of the circular extrusion port at each moment according to the detection result of the rotary encoder, and further calculates the included angle between the central axis of the fourth horizontal movable guide roller and the reference direction at each moment; when the included angle between the fourth horizontal movable guide roller and the reference direction reaches 45 degrees, the central controller commands the bidirectional motor to change the rotating direction, the rotating directions of the first support, the second support, the third support and the fourth support around the central axis of the circular ring extrusion opening are changed along with the change of the rotating directions, and the rotating directions of the traction clamping roller, the first horizontal movable guide roller, the second horizontal movable guide roller, the third horizontal movable guide roller and the fourth horizontal movable guide roller around the central axis of the circular ring extrusion opening are changed along with the change of the rotating directions;
in the process of the steps, the central controller controls the rotating speed of the bidirectional motor at each moment according to the following rules according to the size of an included angle between the central axis of the fourth horizontal movable guide roller and the reference direction: the rotating speed of the bidirectional motor is gradually reduced along with the increase of the numerical value of the included angle, and the rotating speed of the bidirectional motor is increased along with the reduction of the numerical value of the included angle; when the included angle value is zero, the rotating speed of the bidirectional motor reaches the maximum value;
in the process of the above steps, the central controller further controls the output wind speed of the variable frequency fan at each moment according to the following rule according to the size of an included angle between the central axis of the fourth horizontal movable guide roller and the reference direction: when the included angle is smaller than a set value ⍬, the output wind speed of the variable frequency fan is zero, and the output wind speed of the variable frequency fan is zero; when the included angle is larger than a set value ⍬, the output wind speed of the variable frequency fan increases along with the increase of the included angle value and decreases along with the decrease of the included angle value; wherein the value range of the set value ⍬ of the included angle is 6-12 degrees.
2. The production process according to claim 1, characterized in that: the set value ⍬ of the angle is equal to 8 °.
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| US3716322A (en) * | 1969-09-27 | 1973-02-13 | Windmoeller & Hoelscher | Apparatus for flattening and taking away blown tubing of plastics material |
| EP0191114A1 (en) * | 1985-01-18 | 1986-08-20 | Alpine Aktiengesellschaft | Pull-off device for tubular plastic films |
| EP0292614A2 (en) * | 1987-05-27 | 1988-11-30 | Alpine Aktiengesellschaft | Take-off apparatus for tubular films |
| CN2491212Y (en) * | 2001-08-13 | 2002-05-15 | 马镇鑫 | Rotary tractor of blow molding machine |
| CN2635332Y (en) * | 2003-07-10 | 2004-08-25 | 武汉二轻工业科学研究设计有限责任公司 | Upper drawing rotary device of blow moulding film equipment |
| CN109605719A (en) * | 2017-12-27 | 2019-04-12 | 广东金明精机股份有限公司 | Rotation traction traction blown film production technology |
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2020
- 2020-03-08 CN CN202010154693.5A patent/CN111361118B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3716322A (en) * | 1969-09-27 | 1973-02-13 | Windmoeller & Hoelscher | Apparatus for flattening and taking away blown tubing of plastics material |
| EP0191114A1 (en) * | 1985-01-18 | 1986-08-20 | Alpine Aktiengesellschaft | Pull-off device for tubular plastic films |
| EP0292614A2 (en) * | 1987-05-27 | 1988-11-30 | Alpine Aktiengesellschaft | Take-off apparatus for tubular films |
| CN2491212Y (en) * | 2001-08-13 | 2002-05-15 | 马镇鑫 | Rotary tractor of blow molding machine |
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| CN109605719A (en) * | 2017-12-27 | 2019-04-12 | 广东金明精机股份有限公司 | Rotation traction traction blown film production technology |
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