A cooling assembly for a film blowing machine

Abstract

The application relates to the technical field of plastic film blowing, in particular to a cooling assembly of a film blowing machine; the cooling assembly comprises a die head and an annular extrusion port on the lower surface of the die head; a gas nozzle is arranged at the center of the die head; an annular cooling shell is arranged below the die head; an annular groove is arranged on the inner side of the center of the cooling shell; partition plates are uniformly arranged on the inner side of the annular groove; two adjacent partition plates form a partition groove; an upper inner roller and an upper outer roller are rotationally connected to the upper position of the partition groove; the cooling belt connected through transmission is circulated to contact the film bubble from top to bottom, so that the cooling belt can support the film bubble before forming on one hand, and on the other hand, the cooling belt can uniformly radiate heat to the film bubble, thereby improving the quality of the film bubble after forming.

Description

Technical Field

[0001] This invention relates to the field of plastic blown film technology, specifically a cooling component for a blown film machine. Background Technology

[0002] The blown film machine melts thermoplastic granules through a heating device, then conveys them to an annular die via an extruder to form a tubular preform. Compressed air is then introduced into the tubular preform to expand it into a film bubble, which is then rapidly cooled and shaped by a cooling assembly. Subsequently, a traction device achieves stable stretching, and finally, a winding machine winds it into a continuous plastic film. Its core forming logic is a continuous operation process of "melting-blowing-cooling-traction," and the synergy of each stage directly determines the forming quality of the film product.

[0003] As a key unit in membrane bubble formation, the cooling component is mainly divided into two categories: The first is airflow cooling, which involves spraying a low-temperature airflow onto the outer surface of the membrane bubble through an annular air channel. The airflow then transfers heat away from the membrane bubble, and the heated airflow is directly discharged. This method has the advantages of simple structure and low maintenance cost, but the low thermal conductivity of gases limits cooling efficiency, making it suitable for applications with lower requirements for film forming speed and cooling uniformity. The second is liquid flow cooling, which typically uses cooling water as the medium. Liquid is sprayed onto the outer surface of the membrane bubble through a spray device to form a continuous water curtain, efficiently cooling the membrane bubble moving from top to bottom. Because the thermal conductivity of liquids is much higher than that of gases, the heat exchange efficiency of liquid flow cooling is significantly better than that of airflow cooling, meeting the cooling rate requirements of high-speed blown film production, and is therefore widely used in industrial production.

[0004] However, fluid flow cooling still presents significant technical challenges in practical applications. Firstly, the density of the coolant (mostly cooling water) is much greater than that of the airflow cooling medium, resulting in a stronger impact. Since the inflated film bubble is not yet fully formed and has low inherent strength, the direct impact of the coolant easily causes localized depressions and displacements in the film bubble. If this impact force is counteracted simply by increasing the internal air pressure of the film bubble, it can lead to excessive expansion, not only compromising the pre-set film thickness but also potentially causing the bubble to rupture due to stress concentration, thus affecting production continuity. Secondly, when the coolant flows over the outer surface of the film bubble, it is affected by gravity, surface tension, and the bubble's velocity, making it difficult to move uniformly along the pre-set path. This easily leads to localized liquid accumulation or flow blind spots, resulting in inconsistent circumferential and axial cooling rates. This cooling inhomogeneity directly causes defects such as film thickness deviations, surface wrinkles, and uneven crystallinity, severely reducing the final product's molding quality and mechanical properties. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a cooling assembly for a blown film machine. This invention uses a cooling belt connected by a transmission to circulate and contact the blown film bubble that moves from top to bottom. This allows the cooling belt to support the blown film bubble before it is formed and to dissipate heat evenly from the blown film bubble, thereby improving the quality of the blown film bubble after it is formed.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A blowing film machine cooling assembly of this invention includes a die head and an annular extrusion port on the lower surface of the die head; an air nozzle is provided at the center of the die head; an annular cooling shell is provided below the die head; an annular groove is provided at the upper inner side of the center of the cooling shell; partition plates are evenly arranged on the inner side of the annular groove; two adjacent partition plates form a partition groove; an upper inner roller and an upper outer roller are rotatably connected at the upper position of the partition groove; a lower inner roller and a lower outer roller are rotatably connected at the lower position of the partition groove; the upper inner roller, the upper outer roller, and the lower inner roller... The diameters of the rollers and the lower outer roller decrease as they approach the middle section; the outer walls of the upper inner roller, upper outer roller, lower inner roller, and lower outer roller are connected to a cooling belt; the cooling belt is composed of an inner membrane layer and an outer absorbent layer; the outer surface of the cooling belt is in contact with the outer wall of the membrane bubble; a spray pipe with nozzles and a liquid inlet connector is fixedly connected to the top of the cooling shell; the nozzles face the outer surface of the cooling belt; a liquid outlet connector is connected to the bottom of the cooling shell; the outer surface of the cooling belt is in close contact with the extrusion roller; the ends of the extrusion roller and the lower outer roller are connected to the outer vertical block.

[0007] Preferably, one end of the upper inner roller is rotatably connected to a drive groove on the inner wall of the partition groove; a worm gear fixedly connected to the end of the upper inner roller is rotatably connected in the drive groove; the worm gear meshes with a worm; a drive motor is fixedly connected to the end of the worm; and the drive motor is fixedly connected to the inner wall of the top of the annular groove.

[0008] Preferably, the nozzle is positioned close to the upper outer roller; the nozzle is aligned with the central axis of the upper outer roller through the cooling belt.

[0009] Preferably, the inner wall of the partition groove is provided with an inner vertical groove near the center of the cooling shell; an inner vertical block is slidably connected to the inner vertical groove; the inner vertical block is rotatably connected to the end of the lower inner roller; the upper surface of the inner vertical block is connected to the upper end of the inner vertical groove by a first spring; the inner wall of the partition groove is provided with an outer vertical groove away from the center of the cooling shell; an outer vertical block is slidably connected to the outer vertical groove; the outer vertical block is threadedly connected to a screw; the screw is rotatably connected to the partition plate; an adjusting gear is fixedly connected to the lower end of the screw; an annular adjusting groove is provided through the lower part of the arc-shaped outer wall of the cooling shell; an adjusting ring is rotatably connected to the adjusting groove; the inner edge of the adjusting ring is provided with teeth that mesh with the adjusting gear.

[0010] Preferably, the adjusting groove has raised rings on its outer upper and lower edges; the outer surface of the adjusting ring is threaded with bolts.

[0011] Preferably, two corresponding outer vertical blocks are fixedly connected to an intercepting plate close to each other; the intercepting plate is inclined; the upper edge of the intercepting plate is attached to the outer surface of the cooling belt; the intercepting plate is located below the extrusion roller.

[0012] Preferably, the lower edge of the interceptor plate is arc-shaped and arches upward; the end of the interceptor plate is in contact with the partition plate.

[0013] Preferably, the water-absorbing layer is composed of multiple water-absorbing blocks and multiple partition plates; the multiple water-absorbing blocks and multiple partition plates are staggered; the length direction of the partition plates is the width direction of the cooling zone.

[0014] Preferably, the extrusion roller and the lower outer roller are rotatably connected to the outer vertical block; the extrusion roller is in rolling contact with the outer surface of the cooling belt; the extrusion roller is positioned close to the lower outer roller, and the distance between the extrusion roller and the lower outer roller is less than the thickness of the cooling belt.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The present invention uses a cooling belt connected by a transmission to circulate and contact the membrane bubble moving from top to bottom. This allows the cooling belt to support the membrane bubble before it is formed and to dissipate heat evenly from the membrane bubble, thereby improving the quality of the formed membrane bubble.

[0017] 2. During the process of passing through the upper outer roller, the water-absorbing layer of the cooling belt of the present invention is in an outward-turned state, thereby increasing the adsorption gap of the water-absorbing layer. This makes it easier for the coolant sprayed from the nozzle to enter the adsorption gap of the water-absorbing layer, which facilitates the absorption and adhesion of the coolant, ensures the water content of the water-absorbing layer, and thus provides a guarantee for the cooling of the membrane bubble.

[0018] 3. This invention indirectly adjusts the cooling time of the cooling belt on the same position of the membrane bubble by adjusting the distance between the lower inner roller and the upper inner roller, thereby making the cooling time of the membrane bubble adjustable and suitable for different cooling requirements. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a perspective view of the membrane bubble under cooling conditions according to the present invention;

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a perspective view of the present invention;

[0023] Figure 4 yes Figure 3 A 3D view with the cooling shell removed;

[0024] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0025] Figure 6 This is a perspective view of two adjacent partition plates and the cooling belt in this invention;

[0026] Figure 7 This is a diagram showing the location of the drive slot in this invention;

[0027] Figure 8 yes Figure 7 Enlarged view of point C in the middle;

[0028] Figure 9 This is a perspective view of the cooling zone in this invention;

[0029] Figure 10 yes Figure 1 A sectional view;

[0030] Figure 11 yes Figure 10 Enlarged view of point D in the middle;

[0031] Figure 12 This is a perspective view of the interceptor plate in this invention.

[0032] In the diagram: Die head 1, Extrusion port 11, Air nozzle 12, Cooling shell 2, Annular groove 21, Liquid outlet connector 22, Adjustment groove 23, Adjustment ring 24, Convex ring 25, Bolt 26, Partition plate 3, Partition groove 31, Inner vertical groove 32, Inner vertical block 33, First spring 34, Outer vertical groove 35, Upper inner roller 4, Drive groove 41, Worm gear 42, Worm 43, Drive motor 44, Upper outer roller 5, Lower inner roller 6, Lower outer roller 7, Cooling belt 8, Film layer 81, Water absorption layer 82, Water absorption block 821, Partition plate 822, Extrusion roller 83, Outer vertical block 84, Screw 85, Adjustment gear 86, Interception plate 87, Spray pipe 9, Liquid inlet connector 91, Nozzle 92. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] like Figures 1 to 12 As shown, the present invention includes the following embodiments:

[0035] Example 1: A cooling assembly for a blown film machine includes a die head 1 and an annular extrusion port 11 on the lower surface of the die head 1; an air nozzle 12 is provided at the center of the die head 1; an annular cooling shell 2 is provided below the die head 1; an annular groove 21 is provided at the upper position of the inner side of the center of the cooling shell 2; partition plates 3 are evenly arranged on the inner side of the annular groove 21; two adjacent partition plates 3 form a partition groove 31; an upper inner roller 4 and an upper outer roller 5 are rotatably connected at the upper position of the partition groove 31; a lower inner roller 6 and a lower outer roller 7 are rotatably connected at the lower position of the partition groove 31; the diameters of the upper inner roller 4, upper outer roller 5, lower inner roller 6, and lower outer roller 7 vary with... The cooling belt 8 is connected to the outer walls of the upper inner roller 4, upper outer roller 5, lower inner roller 6, and lower outer roller 7. The cooling belt 8 is composed of an inner membrane layer 81 and an outer absorbent layer 82. The outer surface of the cooling belt 8 is in contact with the outer wall of the membrane bubble. A spray pipe 9 with a nozzle 92 and a liquid inlet connector 91 is fixedly connected to the top of the cooling shell 2. The nozzle 92 faces the outer surface of the cooling belt 8. A liquid outlet connector 22 is connected to the bottom of the cooling shell 2. The outer surface of the cooling belt 8 is in close contact with the extrusion roller 83. The ends of the extrusion roller 83 and the lower outer roller 7 are connected to the outer vertical block 84.

[0036] In this embodiment, one end of the upper inner roller 4 is rotatably connected to the drive groove 41 on the inner wall of the partition groove 31; a worm gear 42 fixedly connected to the end of the upper inner roller 4 is rotatably connected in the drive groove 41; the worm gear 42 meshes with a worm 43; the end of the worm 43 is fixedly connected to the output end of the drive motor 44; the drive motor 44 is fixedly connected to the top inner wall of the annular groove 21.

[0037] The annular preform extruded from the die head 1 of the blown film machine is subjected to air pressure through the nozzle 12. The preform expands under this pressure, forming an annular bubble. This bubble passes through the inner center of the cooling shell 2 from top to bottom. The expanded bubble contacts the outer surface of the cooling belt 8, which supports the bubble. The cooling belt 8 is connected to the outer walls of the upper inner roller 4, upper outer roller 5, lower inner roller 6, and lower outer roller 7. The downward-moving bubble drives the contacting cooling belt 8 synchronously through static friction. During this process, the cooling belt 8... The inner roller 4, upper outer roller 5, lower inner roller 6, and lower outer roller 7 roll on their outer walls. The cooling belt 8 is composed of an inner film layer 81 and an outer water-absorbing layer 82. As the cooling belt 8 passes the lower outer roller 7 and the squeeze roller 83, the squeeze roller 83 can roll and squeeze the outer layer of the cooling belt 8. The liquid adsorbed on the outer layer of the cooling belt 8 will be squeezed and flow downwards. The liquid squeezed out by the squeeze roller 83 will flow into the bottom of the cooling shell 2 for collection, and finally flow away along the liquid outlet 22. The cooling belt 8, after being rolled and squeezed by the squeeze roller 83, will move from bottom to top and pass through the upper outer roller 5 and the liquid inlet 22. 91 will enter the coolant, which will flow along the spray pipe 9 and finally be sprayed onto the outer surface of the cooling belt 8 through the nozzle 92. After re-absorbing the coolant, the outer layer of the cooling belt 8 will continue to move, and the cooling belt 8 will be moved from the upper outer roller 5 to the upper inner roller 4. Then, the cooling belt 8 and the membrane bubble will move down synchronously. The outer layer of the cooling belt 8 will drive the coolant to circulate and contact the membrane bubble, which will provide support for the membrane bubble before it is formed and cool the membrane bubble. Because the coolant has poor flow inside the outer layer of the cooling belt 8, the coolant can contact the membrane bubble as the outer layer of the cooling belt 8 moves, thereby... The cooling liquid makes the membrane bubble more evenly contacted, improving the uniformity of membrane bubble cooling and thus improving the quality of the membrane bubble after forming. The cooling belt 8 from the upper inner roller 4 to the lower inner roller 6 is in contact with the outer surface of the membrane bubble. The outer surface of the membrane bubble is covered by the cooling belt 8. The heat on the membrane bubble is absorbed by the cooling liquid contained in the cooling belt 8. The cooling belt 8 that crosses the lower inner roller 6 will move radially away from the membrane bubble along the cooling shell 2. The cooling belt 8 will pass through the extrusion roller 83 again. The extrusion roller 83 will squeeze out the cooling liquid containing heat from the cooling belt 8 again. This process is repeated to achieve the cyclic cooling and forming of the membrane bubble by the cooling belt 8.

[0038] Furthermore, during the top-to-bottom transmission of the membrane bubble, the drive motor 44 will work to drive the worm 43 to rotate. The rotation of the worm 43 will drive the worm wheel 42 to rotate. The rotation of the worm wheel 42 will drive the upper inner roller 4 to rotate. The rotation of the upper inner roller 4 will drive the cooling belt 8 connected to the transmission to rotate. In order to avoid slippage, anti-slip teeth (not shown in the figure) can be provided on the inner surface of the cooling belt 8. Anti-slip grooves (not shown in the figure) are provided on the outer walls of the upper inner roller 4, upper outer roller 5, lower inner roller 6 and lower outer roller 7. The anti-slip teeth on the inner surface of the cooling belt 8 can be inserted into the anti-slip grooves in sequence to achieve the purpose of anti-slip. The transmission speed of the cooling belt 8 is consistent with the top-to-bottom transmission speed of the membrane bubble, turning the cooling belt 8 from the original driven part into the driving part. This avoids slippage between the membrane bubble and the cooling belt 8, and also makes the transmission speed of each cooling belt 8 in the circumferential direction of the membrane bubble consistent, so as to achieve uniform cooling of the outer surface of the membrane bubble in the circumferential direction.

[0039] In this embodiment, the distance between the extrusion roller 83 and the lower outer roller 7 is less than the thickness of the cooling belt 8. In addition, existing coolant is not easy to collect after contacting the membrane bubble. For example, the existing technology uses negative pressure adsorption to collect coolant, which can easily scratch the membrane bubble. The present invention facilitates the collection of coolant while minimizing damage to the membrane bubble. The present invention uses a transmission-connected cooling belt 8 to circulate and contact the membrane bubble that moves from top to bottom. This allows the cooling belt 8 to support the membrane bubble before it is formed and to dissipate heat evenly from the membrane bubble, thereby improving the quality of the formed membrane bubble.

[0040] Example 2: The nozzle 92 is positioned close to the upper outer roller 5; the nozzle 92 is aligned with the central axis of the upper outer roller 5 through the cooling belt 8.

[0041] Since the nozzle 92 is aligned with the central axis of the upper outer roller 5 through the cooling belt 8, the coolant sprayed by the nozzle 92 will directly spray onto the water-absorbing layer 82 on the outer layer of the cooling belt 8. The cooling belt 8 is connected to the outer wall of the upper outer roller 5. Therefore, as the water-absorbing layer 82 of the cooling belt 8 passes through the upper outer roller 5, the water-absorbing layer 82 on the cooling belt 8 is in an outward-turned state, thereby increasing the material adsorption gap of the water-absorbing layer 82. This makes it easier for the coolant sprayed by the nozzle 92 to enter the adsorption gap of the water-absorbing layer 82, which facilitates the absorption and adhesion of the coolant, ensures the water content of the water-absorbing layer 82, and thus provides a guarantee for the cooling of the membrane bubble.

[0042] Example 3: An inner vertical groove 32 is provided on the inner wall of the partition groove 31 near the center of the cooling shell 2; an inner vertical block 33 is slidably connected to the inner vertical groove 32; the inner vertical block 33 is rotatably connected to the end of the lower inner roller 6; the upper surface of the inner vertical block 33 is connected to the upper end of the inner vertical groove 32 by a first spring 34; an outer vertical groove 35 is provided on the inner wall of the partition groove 31 away from the center of the cooling shell 2; an outer vertical block 84 is slidably connected to the outer vertical groove 35; the outer vertical block 84 is threadedly connected to a screw 85; the screw 85 is rotatably connected to the partition plate 3; an adjusting gear 86 is fixedly connected to the lower end of the screw 85; an annular adjusting groove 23 is provided on the lower part of the arc-shaped outer wall of the cooling shell 2; an adjusting ring 24 is rotatably connected to the adjusting groove 23; the inner edge of the adjusting ring 24 is provided with teeth that mesh with the adjusting gear 86.

[0043] In this embodiment, the adjusting groove 23 is provided with a raised ring 25 on its outer upper and lower edges; the adjusting ring 24 is threaded with a bolt 26 on its outer surface.

[0044] The contact time between the cooling band 8 and the membrane bubble directly affects the cooling time of the membrane bubble. To ensure adequate cooling, the contact time between the cooling band 8 and the membrane bubble can be adjusted. Specifically, this is achieved by loosening bolt 26 until the holding end of bolt 26 is no longer in contact with the convex ring 25, thus unlocking bolt 26. Then, by moving bolt 26, the adjusting ring 24 rotates within the adjusting groove 23. During this rotation, the teeth on the inner edge of the adjusting ring 24 rotate synchronously. The teeth on the inner edge of the adjusting ring 24 mesh with the adjusting gear 86, which in turn drives the screw 85. This rotation causes the outer vertical block 84 within the outer vertical groove 35 to move up or down. The upward movement of the outer vertical block 84 causes the lower outer roller 7 and the extrusion roller 83 to move up, while the first spring 34 pushes the inner vertical block 33 downward. This downward movement of the inner vertical block 33 causes the lower inner roller 6 to move down, increasing the distance between the lower inner roller 6 and the upper inner roller 4. This ensures proper contact between the cooling band 8 and the membrane bubble. The increased area extends the cooling time of the cooling belt 8 at the same position as the membrane bubble. As the outer vertical block 84 moves downward, it drives the lower outer roller 7 and the extrusion roller 83 downward, causing the cooling belt 8 to pull the lower inner roller 6 upward. This upward movement of the lower inner roller 6 drives the inner vertical block 33 upward along the inner vertical groove 32. The inner vertical block 33 needs to overcome the elastic force of the first spring 34 during its upward movement. The lower inner roller 6 shortens its distance from the upper inner roller 4, thus reducing the contact area between the cooling belt 8 and the membrane bubble, and shortening the cooling time at the same position. Therefore, by adjusting the distance between the lower inner roller 6 and the upper inner roller 4, the cooling time of the cooling belt 8 at the same position of the membrane bubble can be indirectly adjusted, making the cooling time of the membrane bubble adjustable to suit different cooling requirements. After adjusting the position of the outer vertical block 84, the bolt 26 is tightened so that its gripping position abuts against the convex ring 25, locking the adjusting ring 24.

[0045] Example 4: Two corresponding outer vertical blocks 84 are fixedly connected to an intercepting plate 87 on one side close to each other; the intercepting plate 87 is inclined; the upper edge of the intercepting plate 87 is attached to the outer surface of the cooling strip 8; the intercepting plate 87 is located below the extrusion roller 83.

[0046] In this embodiment, the lower edge of the interceptor plate 87 is arc-shaped and arches upward; the end of the interceptor plate 87 is in contact with the partition plate 3.

[0047] As the cooling belt 8 passes through the lower outer roller 7 and the extrusion roller 83, the coolant on the cooling belt 8 is squeezed and detached from the absorbent layer 82 of the cooling belt 8 by the rolling extrusion roller 83. If the lower inner roller 6 is vertically higher than the lower outer roller 7, the coolant squeezed out by the extrusion roller 83 will directly detach from the outer surface of the cooling belt 8 and drip down. If the lower inner roller 6 is vertically lower than the lower outer roller 7, the coolant squeezed out by the extrusion roller 83 will easily flow along the cooling belt 8 towards the bubble, causing coolant overflow. However, by attaching an interceptor plate 87 to the outer surface of the cooling belt 8, and the interceptor plate 87 is inclined at the extrusion roller 8, the coolant can be effectively removed. Below 3, the interceptor plate 87 can block and intercept the coolant squeezed out by the extrusion roller 83, allowing the coolant to drip smoothly into the bottom of the cooling shell 2 for collection. In addition, since the lower edge of the interceptor plate 87 is arc-shaped and arched upwards, the interceptor plate 87 can guide the coolant. The end of the interceptor plate 87 is lower than the middle section in the vertical direction, so the coolant guided on the interceptor plate 87 will flow along the end of the interceptor plate 87 to the partition plate 3, and finally flow along the partition plate 3 to the bottom of the cooling shell 2, reducing the drip height of the coolant and reducing the probability of splashing caused by the coolant dripping.

[0048] Example 5: The water-absorbing layer 82 is composed of multiple water-absorbing blocks 821 and multiple partition plates 822; the multiple water-absorbing blocks 821 and multiple partition plates 822 are staggered; the length direction of the partition plate 822 is the width direction of the cooling strip 8.

[0049] Under the action of the partition plate 822, the coolant attached to the water-absorbing layer 82 will not flow along the length of the cooling band 8. During the cooling process of the cooling band 8 contacting the outer surface of the membrane bubble, the coolant adheres to the water-absorbing block 821. Two adjacent water-absorbing blocks 821 are separated by the partition plate 822, so the coolant remaining in the upper water-absorbing block 821 will not flow downwards. This ensures that the water content of the water-absorbing layer 82 of the cooling band 8 is consistent throughout, further improving the uniformity of cooling the outer surface of the membrane bubble by the cooling band 8. This improves the membrane bubble forming effect. In this embodiment, the partition plate 822 occupies a small space, for example, with a thickness of less than 1 mm, so it will not affect the cooling effect of the water-absorbing layer 82 of the cooling belt 8 on the membrane bubble. In addition, with the partition plate 822 in place, when the water-absorbing layer 82 of the coolant is squeezed and drained by the squeezing roller 83, the coolant attached to the water-absorbing block 821 will be pressurized and flow out in the width direction of the cooling belt 8, making it easier for the coolant to flow downward along the partition plate 3, further reducing the probability of coolant splashing downward.

[0050] Example 6: The extrusion roller 83 and the lower outer roller 7 are rotatably connected to the outer vertical block 84; the extrusion roller 83 makes rolling contact with the outer surface of the cooling belt 8; the extrusion roller 83 is positioned close to the lower outer roller 7, and the distance between the extrusion roller 83 and the lower outer roller 7 is less than the thickness of the cooling belt 8; since the extrusion roller 83 rolls and extrudes the outer surface of the cooling belt 8, compared with non-rolling extrusion, the sliding friction is converted into rolling friction, which greatly reduces the extrusion wear of the extrusion roller 83 on the cooling belt 8, and achieves protection of the cooling belt 8.

[0051] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A film blowing machine cooling assembly, comprising a die head and an annular extrusion port of a lower surface of the die head; a gas nozzle is arranged at the center of the die head; characterized in that: The lower part of the die is provided with an annular cooling shell; the inner side of the center of the cooling shell is provided with an annular groove at the upper position; the inner side of the annular groove is uniformly provided with a partition plate; adjacent two partition plates form a partition groove; the upper position of the partition groove is rotationally connected with an upper inner roller and an upper outer roller; the lower position of the partition groove is rotationally connected with a lower inner roller and a lower outer roller; the diameters of the upper inner roller, the upper outer roller, the lower inner roller and the lower outer roller decrease as they approach the middle position; the outer wall of the upper inner roller, the upper outer roller, the lower inner roller and the lower outer roller is drivingly connected with a cooling belt; the cooling belt is composed of an inner film layer and an outer water absorption layer; the outer surface of the cooling belt is in contact with the outer wall of the film bubble; the top of the cooling shell is fixedly connected with a spraying pipe provided with a nozzle and a liquid inlet connector; the nozzle faces the outer surface of the cooling belt; the bottom of the cooling shell is provided with a liquid outlet connector; the outer surface of the cooling belt is in close contact with the extrusion roller; the ends of the extrusion roller and the lower outer roller are jointly connected to the outer vertical block; One end of the upper inner roller is rotationally connected in the driving groove in the inner wall of the partition groove; the driving groove is rotationally connected with a worm gear fixedly connected with the end of the upper inner roller; the worm gear is engaged with a worm; the end of the worm is fixedly connected with a driving motor; the driving motor is fixedly connected to the top inner wall of the annular groove; The inner wall of the partition groove is provided with an inner vertical groove near the center of the cooling shell; the inner vertical block is slidingly connected in the inner vertical groove; the end of the inner vertical block is rotationally connected with the lower inner roller; the upper surface of the inner vertical block is connected with the upper end of the inner vertical groove through a first spring; the inner wall of the partition groove is provided with an outer vertical groove away from the center of the cooling shell; the outer vertical block is slidingly connected in the outer vertical groove; the outer vertical block is threadedly connected with a screw rod; the screw rod is rotationally connected with the partition plate; the lower end of the screw rod is fixedly connected with an adjusting gear; the arc outer wall of the cooling shell is provided with an annular adjusting groove at the lower position; the adjusting ring is rotationally connected in the adjusting groove; the inner edge of the adjusting ring is provided with teeth engaged with the adjusting gear.

2. A film blowing machine cooling assembly according to claim 1, characterized in that: The nozzle is provided near the upper outer roller; the nozzle is aligned with the central axis of the upper outer roller through the cooling belt.

3. A film blowing machine cooling assembly as claimed in claim 1, wherein: The adjusting groove is provided with a convex ring on the outer upper and lower edges; the outer surface of the adjusting ring is threadedly connected with a bolt.

4. A film cooler assembly according to claim 1, wherein: Two corresponding outer vertical blocks are fixedly connected with an intercepting piece on one side close to each other; the intercepting piece is obliquely arranged; the upper edge of the intercepting piece is attached to the outer surface of the cooling belt; the intercepting piece is located below the extrusion roller.

5. A film cooler assembly according to claim 4, wherein: The lower edge of the intercepting piece is arc-shaped and arches upward; the end of the intercepting piece is in contact with the partition plate.

6. A film cooler assembly according to claim 1, wherein: The water absorption layer is composed of a plurality of water absorption blocks and a plurality of partition pieces; the plurality of water absorption blocks and the plurality of partition pieces are distributed alternately; the length direction of the partition piece is the width direction of the cooling belt.

7. A film cooler assembly according to claim 1 wherein: The extrusion roller and the lower outer roller are jointly rotationally connected to the outer vertical block; the extrusion roller is in rolling contact with the outer surface of the cooling belt; the extrusion roller is provided close to the lower outer roller, and the distance between the extrusion roller and the lower outer roller is less than the thickness of the cooling belt.

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