A multi-layer co-extrusion blown film machine

Abstract

This utility model relates to a multi-layer co-extrusion blown film machine, belonging to the technical field of co-extrusion blown film machines. The multi-layer co-extrusion blown film machine includes: a mounting frame; the disassembly and assembly mechanism includes a die head and a die head installed inside the die head. Multiple interlocking blocks and slots are provided between the die head and the die head. A drive plate is provided above the die head. By using interlocking blocks and locking blocks to cooperate with the slots and blocks for installation, when installing the die head and die head, the operator only needs to align the blocks below the die head with the slots on the die head surface and insert them. Then, as the die head descends, it automatically locks itself inside the die head, greatly simplifying the installation process, eliminating the tedious bolt alignment and tightening operations, significantly reducing the installation time, and improving production efficiency and equipment utilization. At the same time, it also reduces the technical requirements and labor intensity for operators, achieving quick and easy installation of the die head.

Description

Technical Field

[0001] This utility model relates to the field of co-extrusion blown film machine technology, and in particular to a multi-layer co-extrusion blown film machine. Background Technology

[0002] Multilayer co-extrusion blown film machines are advanced plastic film production equipment. They pump polymer melts with different functions into a precisely designed common die through multiple extruders. After layering and laminating inside the die, the melts are extruded through an annular die to form a cylindrical preform. This preform is then inflated into a film bubble by compressed air from the die core, cooled by a cooling fan ring, folded by a herringbone plate, and pulled by traction rollers before finally being wound into a multilayer composite film. This technology can produce films with superior comprehensive properties such as high strength, high barrier properties, and self-adhesion in a single process, and is widely used in food packaging, pharmaceuticals, agriculture, and industrial fields.

[0003] The die head of a blown film extrusion machine requires regular cleaning. However, during installation, operators must use cranes or other lifting equipment to move the die head to the front of the extruder head and rely on experience for rough manual alignment. After ensuring the bolt holes of the die head flange and the extruder head flange are roughly aligned, operators must insert multiple high-strength bolts sequentially from the bottom. Using a professional torque wrench, following a crisscross pattern, the specified torque is applied to all bolts in multiple stages to ensure uniform stress on the mating surfaces and reliable sealing, preventing material leakage during production. However, the traditional bolt connection installation method is extremely cumbersome and time-consuming. Tightening and loosening a large number of bolts consumes a lot of manpower and time, which seriously affects production efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a multi-layer co-extrusion blown film machine to address the problem of cumbersome die head installation in traditional co-extrusion blown film machines.

[0005] A multi-layer co-extrusion blown film machine includes: a mounting frame; The disassembly and assembly mechanism includes a machine head and a mold head installed inside the machine head. Multiple interlocking blocks and slots are provided between the mold head and the machine head. A drive plate is provided above the mold head.

[0006] In one embodiment, the plurality of said inserts are fixedly connected to the lower surface of the die head, and the plurality of said slots are opened on the upper surface of the die head.

[0007] In one embodiment, a locking block is slidably connected to the inner wall of the insert block, the locking block having a right-angled triangular cross-section, and a spring is fixedly connected between the locking block and the inner wall of the insert block.

[0008] In one embodiment, the machine head has a slot inside, the slot is located at the bottom of the slot and communicates with the slot, and the slot cooperates with the card block.

[0009] A reset ring is slidably connected to the inner wall of the machine head. The reset ring is located at the bottom of the slot. In one embodiment, multiple telescopic rods are fixedly connected to the inner wall of the machine head. Springs are installed inside the telescopic rods. The top ends of the multiple telescopic rods are fixedly connected to the lower surface of the reset ring.

[0010] In one embodiment, a plurality of lifting rods are fixedly connected to the upper surface of the reset ring, the top end of the lifting rods extends out of the machine head, a magnetic block is fixedly connected to the top end of the lifting rods, and a plurality of magnetic blocks that cooperate with the magnetic block at the top end of the lifting rods are fixedly connected to the lower surface of the drive plate.

[0011] In one embodiment, a plurality of slide rods are fixedly connected to the lower surface of the drive plate, and the bottom end of the slide rods is slidably connected to the inner wall of the mold head.

[0012] In one embodiment, a plurality of lifting rings are fixedly connected to the upper surface of the drive plate.

[0013] Beneficial effects 1. By setting insert blocks and locking blocks between the die head and the machine head, and using slots and insert blocks for installation, the operator only needs to align the insert block under the die head with the slot on the surface of the machine head and insert it. Then, as the die head descends, it will automatically lock in the machine head. This greatly simplifies the installation process, eliminates the tedious bolt alignment and tightening work, significantly reduces the installation time, and improves production efficiency and equipment utilization. At the same time, it also reduces the technical requirements and labor intensity of the operators, and realizes quick and easy installation of the die head. 2. By setting up a drive plate in conjunction with a reset ring, when workers need to clean the mold head, they can simply use a lifting device with the lifting ring on the drive plate to lift the entire mold. During the lifting process, the drive plate will automatically drive the reset ring to push the locking blocks from the slots into the insert blocks, thus quickly "unlocking" the mold head from the machine head. This combines the unlocking action with the lifting operation, automating the disassembly process. It not only completely avoids the component damage and personal safety hazards that may be caused by manual use of tools to knock or pry, but also ensures that all locking blocks disengage from the slots synchronously and accurately through the reset ring, improving the stability and reliability of the disassembly process. It minimizes the mold head disassembly time, greatly facilitating subsequent cleaning, color changing, or mold replacement work, and significantly improving equipment maintenance efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the disassembly and assembly mechanism of this utility model; Figure 3 This is an exploded view of the disassembly and assembly mechanism of this utility model; Figure 4 This is a cross-sectional view of the disassembly and assembly mechanism of this utility model; Figure 5 This is a schematic diagram showing the connection between the insert block and the card block of this utility model.

[0016] Figure label: 100. Mounting bracket; 200. Disassembly and assembly mechanism; 210. Machine head; 211. Slot; 212. Card slot; 213. Lifting rod; 214. Reset ring; 215. Telescopic rod; 220. Die head; 221. Insert block; 222. Card block; 230. Drive board; 231. Lifting ring; 232. Slide rod. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] The following is combined Figure 1 - Figure 5 This invention describes a multi-layer co-extrusion blown film machine.

[0019] In one embodiment, a multilayer co-extrusion blown film machine includes: a mounting frame 100; The disassembly and assembly mechanism 200 includes a machine head 210 and a mold head 220 installed inside the machine head 210. Multiple interlocking blocks 221 and slots 211 are provided between the mold head 220 and the machine head 210. A drive plate 230 is provided above the mold head 220.

[0020] The mounting frame 100 mainly integrates the core mechanisms for film bubble forming, cooling, and traction. At its bottom is a cooling air ring, which uses uniformly sprayed cooling air to initially cool and shape the high-temperature film bubble extruded from the die 220, and uses a certain airflow speed to stabilize the initial shape of the film bubble. Above this is a herringbone plate composed of two symmetrically arranged "V"-shaped plates or rollers. Its function is to gradually converge and flatten the cylindrical film bubble into a straight double-layer film, while further aiding in film cooling. At the top of the herringbone plate is a pair of closely fitted, relatively rotating traction rollers. Their main function is to actively clamp and uniformly traction the flattened film upwards, providing stable tensile traction force for the entire film bubble, precisely controlling the speed of the production line, and ultimately conveying the cooled and shaped film to the upper winding device.

[0021] like Figure 3 , Figure 4 and Figure 5 As shown, multiple insert blocks 221 are fixedly connected to the lower surface of the die head 220, and multiple slots 211 are formed on the upper surface of the die head 210. A locking block 222 is slidably connected to the inner wall of the insert block 221. The locking block 222 has a right-angled triangular cross-section, and a spring is fixedly connected between the locking block 222 and the inner wall of the insert block 221. A slot 212 is formed inside the die head 210, located at the bottom end of the slot 211 and communicating with it. The slot 212 and the locking block 222 cooperate with each other. A reset ring 214 is slidably connected to the inner wall of the die head 210, located at the bottom end of the slot 212. Multiple telescopic rods 215 are fixedly connected to the inner wall of the die head 210, each containing a spring. The top ends of the multiple telescopic rods 215 are fixedly connected to the lower surface of the reset ring 214. Multiple lifting rods 213 are fixedly connected to the upper surface of the reset ring 214. The top end of the lifting rod 213 extends out of the machine head 210. A magnetic block is fixedly connected to the top end of the lifting rod 213. Multiple magnetic blocks that cooperate with the magnetic block at the top end of the lifting rod 213 are fixedly connected to the lower surface of the drive plate 230.

[0022] In this embodiment, the surface of the mold is provided with through holes corresponding to the lifting rod 213. When the insert block 221 is aligned with the slot 211, the through holes are also aligned with the lifting rod 213. When the mold is fully inserted into the machine head 210, the magnetic block at the top of the lifting rod 213 and the magnetic block on the lower surface of the drive plate 230 are in contact with each other, and a magnetic force is generated to attract each other. This magnetic force can stably connect the lifting rod 213 and the drive plate 230, so that the reset ring 214 moves along the inclined surface of the card block 222 and pushes the card block 222 back into the insert block 221. When the reset ring 214 moves to the top of the card block 222, the reset ring 214 will be unable to move, and the drive plate 230 continues to rise. The tension between the two magnetic blocks increases instantaneously, causing the two magnetic blocks to separate. It should be noted that this device achieves the optimization effect by changing the connection method between the die head 220 and the machine head 210. Since the disassembly and assembly mechanisms 200 are all located on the inner wall of the machine head 210 and below the working area of ​​the die head 220, they will not affect the normal blown film operation of the die head 220.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, a plurality of sliding rods 232 are fixedly connected to the lower surface of the drive plate 230, and the bottom ends of the sliding rods 232 are slidably connected to the inner wall of the mold head 220. A plurality of lifting rings 231 are fixedly connected to the upper surface of the drive plate 230.

[0024] In this embodiment, the slide bar 232 mainly consists of a round rod and a limiting block fixedly connected to the bottom of the round rod. The diameter of the limiting block is larger than the diameter of the round rod. When the reset ring 214 moves to the top of the slot 212, the limiting block part of the slide bar 232 also moves to the limit position on the inner wall of the mold head 220. At this time, the lifting equipment pulls the lifting ring 231, which will directly drive the mold head 220 to move upward, thereby pulling the mold head 220 out of the machine head 210.

[0025] Working principle: When the operator needs to clean the mold head 220, it needs to be removed from the machine head 210. The operator simply connects the hook of the equipment to the lifting ring 231 on the surface of the drive plate 230, and then starts the lifting equipment. The hook drives the lifting ring 231 upwards, which in turn drives the drive plate 230. Initially, the mold head 220 is stationary. A displacement difference is created between the drive plate 230 and the sliding rod 232. At this point, the drive plate 230 connects to the magnetic block at the top of the lifting rod 213 via its bottom magnetic block. The lifting rod 213 then drives the reset ring 214 upwards. The reset ring 214 moves upwards within the slot 212. Multiple locking blocks 222 will be pushed synchronously into the interior of the insert block 221 along the inclined surface of the locking block 222. When the reset ring 214 moves to the top of the slot 212, the reset ring 214 can no longer move, while the drive plate 230 continues to move upward. When the pulling force between the drive plate 230 and the lifting rod 213 is greater than the magnetic force between the two sets of magnetic blocks, the lifting rod 213 separates from the drive plate 230. At this time, the slide rod 232 moves to the limit position inside the mold head 220 and gets stuck. At this time, the lifting equipment will pull the mold head 220 upward through the drive plate 230. The locking block 222 is located inside the insert block 221 and will not cooperate with the slot 212. The insert block 221 can be directly pulled out from the slot 211 to complete the disassembly. The reset block is reset under the action of the telescopic rod 215. After the cleaning is completed, the mold head 220 needs to be reinstalled on the machine head 210. The operator uses a lifting device to hoist the mold head 220 above the machine head 210, aligns the insert block 221 with the slot 211, and then lowers the mold head 220 using the lifting device. The insert block 221 is then pulled into the slot 211. When the insert block 221 enters the slot 211, its internal locking block 222 is pushed into the slot 212 by the inner wall of the machine head 210 and compresses the spring. When the insert block 221 moves to the bottom of the slot 211, the locking block 222 aligns with the slot 212. At this time, the locking block 222 loses its restraint, and the spring pushes the locking block 222 into the slot 212, completing the engagement.

[0026] It should be noted that the mounting bracket 100, mold head 220, machine head 210 and lifting ring 231 mentioned above are all components with relatively mature existing technology. The specific models can be selected according to actual needs, and will not be elaborated here.

[0027] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-layer co-extrusion blown film machine, characterized in that, include: Mounting bracket (100); The disassembly and assembly mechanism (200) includes a machine head (210) and a mold head (220) installed inside the machine head (210). A plurality of mutually cooperating inserts (221) and slots (211) are provided between the mold head (220) and the machine head (210). A drive plate (230) is provided above the mold head (220).

2. The multi-layer co-extrusion blown film machine according to claim 1, characterized in that, Multiple inserts (221) are fixedly connected to the lower surface of the mold head (220), and multiple slots (211) are opened on the upper surface of the machine head (210).

3. The multi-layer co-extrusion blown film machine according to claim 1, characterized in that, The inner wall of the insert (221) is slidably connected to a locking block (222), the cross-section of the locking block (222) is a right triangle, and a spring is fixedly connected between the locking block (222) and the inner wall of the insert (221).

4. The multi-layer co-extrusion blown film machine according to claim 3, characterized in that, The machine head (210) has a slot (212) inside. The slot (212) is located at the bottom of the slot (211) and communicates with the slot (211). The slot (212) cooperates with the card block (222).

5. The multi-layer co-extrusion blown film machine according to claim 4, characterized in that, A reset ring (214) is slidably connected to the inner wall of the machine head (210). The reset ring (214) is located at the bottom of the slot (212). A plurality of telescopic rods (215) are fixedly connected to the inner wall of the machine head (210). A spring is provided inside the telescopic rods (215). The top ends of the plurality of telescopic rods (215) are fixedly connected to the lower surface of the reset ring (214).

6. The multi-layer co-extrusion blown film machine according to claim 5, characterized in that, The upper surface of the reset ring (214) is fixedly connected with a plurality of lifting rods (213), the top end of the lifting rods (213) extends out of the machine head (210), the top end of the lifting rods (213) is fixedly connected with a magnetic block, and the lower surface of the drive plate (230) is fixedly connected with a plurality of magnetic blocks that cooperate with the magnetic blocks at the top end of the lifting rods (213).

7. The multi-layer co-extrusion blown film machine according to claim 1, characterized in that, The lower surface of the drive plate (230) is fixedly connected with a plurality of slide rods (232), and the bottom end of the slide rods (232) is slidably connected to the inner wall of the mold head (220).

8. The multi-layer co-extrusion blown film machine according to claim 1, characterized in that, Multiple lifting rings (231) are fixedly connected to the upper surface of the drive plate (230).

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