Three-lip cooling air ring for film blowing machine
Technical Field
The invention relates to a film blowing machine, in particular to a three-lip cooling air ring for the film blowing machine.
Background
Referring to fig. 1 and 2, the existing cooling air ring in the film blowing machine generally has only two air channels, is limited by the air outlet direction and the air outlet quantity, has poor cooling effect of the film bubble, and often neglects cooling of the die discharge port. Such as: chinese patent document No. CN204844842U discloses a cooling air ring in 2015, 12 months and 9 days, and specifically discloses: the cooling air ring is provided with a double-air-channel cooling air ring with an upper air channel and a lower air channel (an upper air channel and a lower air channel) in the axial direction, and the upper air channel and the lower air channel can be communicated with the same air inlet to blow air blown from the air inlet to a film bubble blown out by a die of a film blowing machine. The cooling air ring is basically annular, thus forming an annular integral structure, and is concentrically arranged with an annular die (a discharge hole of the die) of the film blowing machine, and because the cooling air ring has the annular integral structure, two air channels (an upper air channel and a lower air channel) of the cooling air ring are annular and face to a bubble opening blown from the discharge hole of the die, so that wind energy blown from the two air channels can act on the surface of the bubble to cool and shape the bubble; in the two air channels, an opening of a lower air channel closest to a discharge hole of the die is positioned above the discharge hole, and the opening of the lower air channel is inclined upwards relative to the horizontal direction, namely, a central line of the opening of the lower air channel is inclined upwards relative to the horizontal direction; at the opening of the lower air duct, the lower surface of the lower air duct is provided with a protruding part protruding upwards from the lower surface; in the axial direction of the cooling air ring, the height of the protruding part protruding upwards from the lower surface gradually decreases from the radial inner side to the radial outer side of the cooling air ring; the structure cools the film bubble by arranging the upper air duct and the lower air duct, but the air outlets of the upper air duct and the lower air duct are far apart, so that the film bubble cannot obtain a comprehensive and effective cooling effect, and the generation of the film bubble is influenced; in addition, the opening part of the lower air duct is provided with the protruding part to reduce the influence caused by the fact that cooling air directly blows to the film bubble, the protruding part has a steering effect on the cooling air, and the cooling air cannot cool the discharge hole of the die head, so that the overall cooling effect is poor. In addition, in order to eliminate melt fracture of the film surface and reduce thickness deviation of the film, the grinding lip is generally heated to 200-250 ℃, the cooling requirement on the film is higher, each part in the traditional air ring is respectively made of metal materials, and as the metal materials dissipate heat too quickly, heat can be transferred to the film along with air, and the cooling effect is reduced.
Therefore, further improvements are needed.
Disclosure of Invention
The invention aims to provide the three-lip cooling air ring for the film blowing machine, which has the advantages of simple and reasonable structure, reliable and stable performance, good cooling effect, small influence on film bubble and capability of effectively improving the film bubble productivity, so as to overcome the defects in the prior art.
The three-lip cooling air ring for the film blowing machine comprises an air ring body, wherein an annular main air duct is arranged in the air ring body; the method is characterized in that: a first flow distribution disc and a second flow distribution disc are arranged in the main air duct, the first flow distribution disc is in interval fit with the main air duct to form a first air duct, the first flow distribution disc is in interval fit with the second flow distribution disc to form a second air duct, and the second flow distribution disc is in interval fit with the bottom wall of the main air duct to form a third air duct; the air inlet ends of the first air channel, the second air channel and the third air channel are respectively communicated with the main air channel, the first air channel, the second air channel and the third air channel respectively extend towards the center, the air outlet end of the first air channel is inclined to blow upwards, the air outlet end of the second air channel is vertical to blow upwards, and the air outlet end of the third air channel is vertical to blow downwards; the first air channel is located above the second air channel, and the third air channel is located below the second air channel.
The wind ring body comprises an adjustable movable ring, the movable ring is located above the first flow distribution disc, the movable ring is matched with the first wind disc at intervals to form the first wind channel, and the movable ring moves back and forth relative to the first flow distribution disc to adjust the air inlet quantity of the first wind channel.
The first air duct consists of a first horizontal conveying section extending horizontally towards the center and an inclined conveying section extending obliquely towards the center, and the air outlet end of the first air duct is positioned at the top of the inclined conveying section and blows air obliquely outwards.
The second air duct consists of a second horizontal conveying section extending horizontally towards the center and a first arc-shaped conveying section turning upwards, and the air outlet end of the second air duct is positioned at the top of the first arc-shaped conveying section and blows air vertically upwards.
The third air duct consists of a third horizontal conveying section extending horizontally towards the center and a second arc conveying section turning downwards, and the air outlet end of the third air duct is positioned at the bottom of the second arc conveying section and blows air vertically downwards.
The wind ring body further comprises a wind ring cover assembly and a ventilation ring; the movable ring is in adjustable screw connection with the inner side of the windup ring cover assembly, and an adjusting handle is arranged on the movable ring; the ventilation ring is arranged at the top of the movable ring.
The movable ring and/or the upwind ring cover assembly and/or the first flow dividing disk and/or the second flow dividing disk are/is made of carbon fiber materials.
The upper wind ring cover assembly is provided with a plurality of wind cavities communicated with the main wind channel in a rotating and uniform manner, the wind cavities are formed by a bottom plate, a side plate and a top plate in a surrounding mode, and the bottom plate, the side plate and the top plate are respectively made of carbon fiber materials
The first flow dividing disc and/or the second flow dividing disc are/is provided with a flow dividing tip on the periphery side.
The three-lip cooling air ring further comprises an annular upper bubble stabilizing ring and a lower bubble stabilizing ring, wherein the upper bubble stabilizing ring is located above the lower bubble stabilizing ring, the lower bubble stabilizing ring is located above the air ring body, the inner diameter of the upper bubble stabilizing ring is larger than that of the lower bubble stabilizing ring, and the upper bubble stabilizing ring and/or the lower bubble stabilizing ring are arranged in an up-down adjusting mode relative to the air ring body.
According to the invention, the first air flow disc and the second air flow disc are arranged, so that the main air channel is divided into three air channels, and the three air channels are respectively distributed in an up-down mode, so that the up-down position of the film bubble demolding position is cooled, and the purpose of comprehensive and efficient cooling is achieved; according to the demolding shape of the film bubble, the first air duct is used for obliquely discharging air, the second air duct is used for vertically discharging air upwards, the third air duct is used for vertically discharging air downwards, the air discharging direction of each air duct is in compliance with the trend of the outer wall of the film bubble, and the phenomenon of deformation of the film bubble caused by the fact that cooling air directly impacts the film bubble is effectively prevented; the vertical downward air outlet mode of the third air duct can effectively cool the discharge port of the die head, and can critically cool the film bubble just exiting the die head, so that the cooling effect is greatly improved, and the productivity of the film bubble can be effectively improved; the air inlet of the first air channel can be adjusted through the movable ring, and under the condition that the air inlet in the main air channel is stable, the air inlet of the second air channel and the air inlet of the third air channel can be adjusted simultaneously, so that the effect of simultaneously adjusting the air inlet of the three air channels is achieved; the peripheral walls of the upper wind cavity of the upper wind ring cover assembly are respectively made of carbon fiber materials, and the physical properties of the carbon fibers are utilized, so that the temperature rise amplitude of cold wind in the wind cavity is smaller, the cooling effect is further improved, the production efficiency is effectively improved, and the productivity is further improved.
Drawings
Fig. 1 is a partial cross-sectional view of the prior art.
Fig. 2 is an enlarged schematic view at a in fig. 1.
Fig. 3 is an assembled perspective view of an embodiment of the present invention.
Fig. 4 is an assembled front view of an embodiment of the present invention.
Fig. 5 is an assembled top view of an embodiment of the present invention.
Fig. 6 is a sectional view of the operating state in the direction C-C of fig. 5.
Fig. 7 is an enlarged schematic view at B in fig. 6.
Fig. 8 is an exploded view of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Referring to fig. 3-8, the three-lip cooling air ring for the film blowing machine comprises an air ring body, wherein an annular main air duct is arranged in the air ring body; a first flow distribution disc 3 and a second flow distribution disc 4 are arranged in the main air duct, a first air duct 7 is formed by the interval fit of the outer top wall of the first flow distribution disc 3 and the inner top wall of the main air duct, a second air duct 8 is formed by the interval fit of the outer bottom wall of the first flow distribution disc 3 and the outer top wall of the second flow distribution disc 4, and a third air duct 9 is formed by the interval fit of the outer bottom wall of the second flow distribution disc 4 and the inner bottom wall of the main air duct; the air inlet ends of the first air channel 7, the second air channel 8 and the third air channel 9 are respectively communicated with the main air channel, the first air channel 7, the second air channel 8 and the third air channel 9 respectively extend towards the center, the air outlet end of the first air channel 7 is inclined to blow upwards, the air outlet end of the second air channel 8 is vertical to blow upwards, and the air outlet end of the third air channel 9 is vertical to blow downwards; the first air duct 7 is located above the second air duct 8, and the third air duct 9 is located below the second air duct 8. The structure is characterized in that the first air flow disc and the second air flow disc are arranged to divide the main air duct into three air ducts, and the three air ducts are respectively distributed in an up-down mode, so that the up-down position of the demolding position of the bubble C is cooled, and the purpose of comprehensive and efficient cooling is achieved; according to the demolding shape of the film bubble C, the first air duct 7 is inclined to discharge air, the second air duct 8 is vertically upwards discharged air, the third air duct 9 is vertically downwards discharged air, the air discharge direction of each air duct conforms to the trend of the outer wall of the film bubble C, and the film bubble deformation phenomenon caused by the direct impact of cooling air on the film bubble C is effectively prevented; the vertical downward air-out mode of third wind channel 9 can carry out effectual cooling to die head D's discharge gate, carries out critical cooling to just going out die head D's membrane bubble C, has improved the cooling effect greatly, can effectively promote the ability of producing of membrane bubble C moreover.
Further, the air ring body comprises an adjustable movable ring 1, the movable ring 1 is located above the first flow dividing disc 3, the movable ring 1 is matched with the first air duct 7 formed by the first air dividing disc at intervals, and the movable ring 1 moves back and forth relative to the first flow dividing disc 3 so as to adjust the air inlet quantity of the first air duct 7. Under the condition that the air quantity in the main air channel is stable, the air quantity of the second air channel and the air quantity of the third air channel can be adjusted simultaneously by adjusting the air quantity of the first air channel 7, so that the effect of simultaneously adjusting the air quantity of the three air channels is achieved.
Further, the first air duct 7 is bent integrally, and consists of a first horizontal conveying section 7.1 extending horizontally towards the center and an inclined conveying section 7.2 extending obliquely towards the center, and the air outlet end of the first air duct 7 is positioned at the top of the inclined conveying section 7.2 and blows air obliquely outwards.
Further, the second air duct 8 is composed of a second horizontal conveying section 8.1 extending horizontally towards the center and a first arc conveying section 8.2 turning upwards, and the air outlet end of the second air duct 8 is located at the top of the first arc conveying section 8.2 and blows air vertically upwards.
Further, the third air duct 9 is composed of a third horizontal conveying section 9.1 extending horizontally towards the center and a second arc-shaped conveying section 9.2 turning downwards, and the air outlet end of the third air duct 9 is positioned at the bottom of the second arc-shaped conveying section 9.2 and blows air vertically downwards.
Further, the wind ring body further comprises an upper wind ring cover assembly 2, a ventilation ring 13 and a lower wind ring cover assembly 5; the movable ring 1 is adjustably screwed on the inner side of the upper wind ring cover assembly 2, and the upper wind ring cover assembly 2 and the movable ring 1 are matched with the upper wind ring cover assembly 2 up and down to form a main air duct; the movable ring 1 is provided with the adjusting handle 6, so that the movable ring 1 is convenient to adjust; the ventilation ring 13 is sleeved on the top of the movable ring 1, and the middle through cavity of the ventilation ring 13 is communicated with the middle through cavity of the movable ring 1.
Further, the movable ring 1 and/or the upper wind ring cover assembly 2 and/or the first flow distribution disc 3 and/or the second flow distribution disc 4 and/or the lower wind ring cover assembly 5 are made of carbon fiber materials; the component made of carbon fiber is lighter than the traditional component made of metal, and convenient handling assembly, and carbon fiber is thermal-insulated effectual moreover, greatly reduced is to the heat transfer of film, improves the cooling effect.
Further, a plurality of air chambers 10 communicated with the main air duct are uniformly and rotatably arranged on the upper air ring cover assembly 2, the air chambers 10 are formed by encircling a bottom plate 10.1, a side plate 10.2 and a top plate 10.3 together, and the bottom plate 10.1, the side plate 10.2 and the top plate 10.3 are respectively made of carbon fiber materials; tests prove that when the bottom plate 10.1, the side plates 10.2 and the top plate 10.3 made of carbon fibers work, the surface temperature is generally only 40-60 ℃, the temperature of cold air in the air cavity is only 10-15 ℃, and the temperature of the cold air is low enough, so that the cooling effect on the film is good, the production efficiency is effectively improved, and the productivity is greatly improved.
Further, the outer peripheral sides of the first flow distribution disc 3 and the second flow distribution disc 4 are provided with flow distribution tips 4.1, so that wind resistance and wind noise are effectively reduced.
Further, this three-lip cooling wind ring for inflation film manufacturing machine still includes annular last bubble stabilizing ring 11 and lower bubble stabilizing ring 12, go up bubble stabilizing ring 11 and be located lower bubble stabilizing ring 12 top, go up bubble stabilizing ring 11 well and lead to the inner chamber and correspond and communicate from top to bottom in going up bubble stabilizing ring 12, lower bubble stabilizing ring 12 is located ventilative ring 13 top in the wind ring body, go up bubble stabilizing ring 12 well and correspond and communicate from top to bottom in going up the inner chamber and ventilative ring 13, go up bubble stabilizing ring 11's internal diameter is greater than lower bubble stabilizing ring 12's internal diameter, lower bubble stabilizing ring 12's internal diameter is greater than ventilative ring 13's internal diameter, go up bubble stabilizing ring 11 and lower bubble stabilizing ring 12 respectively relative wind ring body up-down regulation formula setting.
The foregoing is a preferred embodiment of the invention showing and describing the general principles, features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.