An extrusion mechanism for PVC film

Abstract

The utility model discloses an extrusion mechanism for PVC film belongs to PVC film production technical field, including conveying melting subassembly, drive assembly and blow molding assembly, the blanking assembly includes with conveying melting subassembly intercommunication blanking shell, the inside of blanking shell is provided with the adjusting shell, the inner wall fixedly connected with fixed shell of blanking shell, the inside of fixed shell is provided with the thread rod, the inner wall of adjusting shell is passed into fixed shell and is arranged on the surface of thread rod, through setting blanking shell into inverted cylinder conical shape, cooperation can be adjusted shell that goes up and down in its inside, through changing the position of adjusting shell in the inside of blanking shell to can adjust the size of the gap between adjusting shell edge and blanking shell inner wall, thereby more convenient control the discharge capacity of blanking outlet, so that the staff can control more accurate when processing the film of different thickness.

Description

Technical Field

[0001] This utility model relates to the field of PVC film production technology, specifically to an extrusion mechanism for PVC film. Background Technology

[0002] PVC film is a flexible plastic film made primarily of polyvinyl chloride resin with added plasticizers, stabilizers, and other additives. It features corrosion resistance, insulation, and ease of printing, and is widely used in packaging, building materials, and other fields. To ensure a more uniform thickness during the processing of PVC film, an extrusion mechanism is required.

[0003] As shown in the reference case "An extrusion blown film device for PVC shrink film production" announcement number "CN219191266U", this utility model sets a conical cover in the feed hopper. The rotation of the cover drives the pusher block to push the raw material falling on the mounting plate into the feed area, so that the raw material entering the feed hopper at any angle can maintain a stable feed amount, ensuring stable operation of the motor of the conveying device, stable feeding, and ensuring the quality of blown film.

[0004] Although the aforementioned application can push the raw material falling on the mounting plate into the feeding area by rotating the cover and pusher block, making the raw material more uniform when entering the feeding hopper, the device cannot control the amount of material fed, which can easily lead to an inability to control the thickness of the film.

[0005] Based on this, the present invention designs an extrusion mechanism for PVC film to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an extrusion mechanism for PVC film.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An extrusion mechanism for PVC film includes a melting conveying component, a driving component, and a blow molding component, wherein the driving component and the blow molding component are respectively disposed at both ends of the melting conveying component;

[0009] Furthermore, the feeding assembly includes a feeding shell connected to the conveying and melting assembly. An adjusting shell is provided inside the feeding shell, and a fixing shell is fixedly connected to the inner wall of the feeding shell. A threaded rod is provided inside the fixing shell, and the inner wall of the adjusting shell penetrates the fixing shell and is disposed on the surface of the threaded rod.

[0010] Furthermore, a diverter block is fixedly connected to the top of the fixed shell. The diverter block is a cone. The fixed shell penetrates the adjusting shell, and the adjusting shell is located below the diverter block.

[0011] Furthermore, a servo motor is fixedly connected to the bottom end of the fixed shell, and the drive end of the servo motor penetrates through the fixed shell and is fixedly connected to the bottom end of the threaded rod. The adjusting shell is frustum-shaped.

[0012] Furthermore, two through slots are provided on both sides of the fixed shell, and the inner wall of the adjusting shell is installed on the surface of the threaded rod through the through slots. A baffle is provided above the through slots and slidably connected to the inner wall of the fixed shell (450). The cross-sectional area of ​​the baffle is equal to the area of ​​the through slots, and a spring is fixedly connected between the baffle and the inner wall of the fixed shell.

[0013] Furthermore, a concentrator shell is fixedly connected to the inner wall of the discharge shell. The concentrator shell is located above the diverter block and is an inverted cylindrical cone shape.

[0014] Furthermore, the conveying and melting assembly includes a housing and a conveying channel disposed inside the housing, wherein the discharge shell penetrates the housing and communicates with the conveying channel.

[0015] Furthermore, the conveying channel is internally rotatably connected to a conveying screw, and the end of the conveying screw near the unloading assembly is driven by a drive assembly.

[0016] Furthermore, a heating coil is provided between the conveying channel and the inner wall of the outer shell, the heating coil is spirally wound around the outer wall of the conveying channel, and the outlet of the conveying channel is connected to the blow molding assembly.

[0017] Beneficial effects

[0018] 1. By setting the feeding shell as an inverted cylindrical cone shape, and using an adjustable shell that can be raised and lowered inside it, the gap between the edge of the adjustable shell and the inner wall of the feeding shell can be adjusted by changing the position of the adjustable shell inside the feeding shell. This makes it easier to control the discharge amount from the feeding port, so that the workers can control it more precisely when processing films of different thicknesses.

[0019] 2. By setting up a central shell and a diversion block below the central shell, when the operator adds material to the feeding port, the material will pass evenly around the adjusting shell and then enter the conveying and melting component from the feeding shell, making the melting component melt the material more evenly and the material conveying more stable. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of the main structure of an extrusion mechanism for PVC film according to the present invention.

[0022] Figure 2 This is a schematic diagram of the overall mechanism of the conveying and melting component of an extrusion mechanism for PVC film according to the present invention;

[0023] Figure 3 This is a schematic diagram of the overall structure of the feeding assembly of an extrusion mechanism for PVC film according to the present invention.

[0024] Figure 4 This is a schematic diagram showing the connection between the protective shell and the adjusting shell of an extrusion mechanism for PVC film according to the present invention.

[0025] Figure 5 This is a cross-sectional view of a protective shell and an adjusting shell for an extrusion mechanism of PVC film according to the present invention.

[0026] 100. Melting conveyor assembly; 110. Housing; 120. Conveying channel; 130. Conveying screw; 140. Heating coil; 200. Blow molding assembly; 300. Drive assembly; 400. Discharge assembly; 410. Discharge shell; 420. Centralizing shell; 430. Diverter block; 440. Adjusting shell; 441. Threaded rod; 442. Servo motor; 450. Fixed shell; 451. Baffle; 452. Spring. Detailed Implementation

[0027] 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.

[0028] The present invention will be further described below with reference to the embodiments.

[0029] In some embodiments, please refer to the appendix to the instruction manual. Figure 1-5An extrusion mechanism for PVC film includes a melting conveying assembly 100, a driving assembly 300, and a blow molding assembly 200, wherein the driving assembly 300 and the blow molding assembly 200 are respectively disposed at both ends of the melting conveying assembly 100.

[0030] The feeding assembly 400 includes a feeding shell 410 connected to the conveying and melting assembly 100. An adjusting shell 440 is provided inside the feeding shell 410. A fixing shell 450 is fixedly connected to the inner wall of the feeding shell 410. A threaded rod 441 is provided inside the fixing shell 450. The inner wall of the adjusting shell 440 penetrates the fixing shell 450 and is disposed on the surface of the threaded rod 441.

[0031] In some embodiments, such as Figure 3 , Figure 4 as well as Figure 5 As shown, in a preferred embodiment of this utility model, a diverter block 430 is fixedly connected to the top of the fixed shell 450. The diverter block 430 is conical. The fixed shell 450 penetrates the adjusting shell 440, which is located below the diverter block 430. A servo motor 442 is fixedly connected to the bottom of the fixed shell 450. The drive end of the servo motor 442 penetrates the fixed shell 450 and is fixedly connected to the bottom of the threaded rod 441. The adjusting shell 440 is frustum-shaped. The two sides of the fixed shell 450... Two through slots are provided. The inner wall of the adjusting shell 440 is installed on the surface of the threaded rod 441 through the through slots. A baffle 451 is slidably connected to the inner wall of the fixed shell 450 above the through slots. The cross-sectional area of ​​the baffle 451 is equal to the area of ​​the through slots. A spring 452 is fixedly connected between the baffle 451 and the inner wall of the fixed shell 450. A concentrating shell 420 is fixedly connected to the inner wall of the discharge shell 410. The concentrating shell 420 is located above the diverter block 430 and is an inverted cylindrical cone shape.

[0032] In this embodiment, the drive assembly 300 includes a drive motor and a base for supporting the drive motor. A small sprocket is fixedly connected to the drive end of the drive motor, and the small sprocket is connected to a large sprocket via a chain. The large sprocket passes through the outer shell 110 of the conveying melt assembly 100 via an adapter and is connected to the threaded rod 441. The rotation of the drive motor drives the small sprocket to rotate, and the cooperation of the small sprocket and the chain drives the large sprocket to rotate. While the large sprocket is rotating, it drives the conveying screw 130 to rotate via the adapter, thereby driving the conveying screw 130. The blow molding assembly 200 mainly consists of a spiral die head, a cooling air ring, and a traction device. Its operating principle is as follows: After the PVC resin is melted and plasticized by the conveying and melting component 100, it forms a tubular preform through the die head. Compressed air is injected from the bottom of the die head to inflate the preform into a film bubble. The cooling air ring quickly sets the film thickness through uniform airflow. When the adjusting shell 440 is raised and lowered, the through groove below the connection between the adjusting shell 440 and the threaded rod 441 is protected by the adjusting shell 440 to prevent material from passing through. This is because the material will fall from the edge of the adjusting shell 440 and then slide down the inner wall of the feeding shell 410, so it will not affect the normal movement of the threaded rod 441. At the same time, the connection between the adjusting shell 440 and the threaded rod 441 is also protected. The channel above the connection point will prevent material from contacting the threaded rod 441 under the action of the diverting block 430 and the baffle 451. After the material is diverted by the diverting block 430, it will fall onto the surface of the adjusting shell 440. Since the surface of the adjusting shell 440 is sloped, the material will only move downwards, which reduces most of the material's impact on the channel. At the same time, the baffle 451 will always be in contact with the connection between the adjusting shell 440 and the threaded rod 441 under the action of the spring 452, preventing the material from passing through the channel. Therefore, the cooperation between the baffle 451 and the diverting block 430 can effectively prevent the material from affecting the threaded rod 441.

[0033] The feeding components 400 of this device are all located inside the feeding shell 410. They are only used to adjust the uniformity and feeding rate of the material when adding material. They will not affect other components of the extrusion mechanism or hinder the normal operation of other components.

[0034] In some embodiments, such as Figure 1 as well as Figure 2As shown, in a preferred embodiment of the present invention, the conveying and melting component 100 includes a housing 110 and a conveying channel 120 disposed inside the housing 110. The unloading shell 410 penetrates the housing 110 and communicates with the conveying channel 120. A conveying screw 130 is rotatably connected inside the conveying channel 120. One end of the conveying screw 130 near the unloading component 400 is driven by a driving component 300. A heating coil 140 is disposed between the conveying channel 120 and the inner wall of the housing 110. The heating coil 140 is spirally wound around the outer wall of the conveying channel 120. The outlet of the conveying channel 120 is connected to the blow molding component 200.

[0035] In this embodiment, when the material falls into the conveying and melting assembly 100 through the feed shell 410, it will fall to the bottom of the conveying channel 120. At this time, the conveying screw 130 is driven by the driving assembly 300, and the material is transported to the blow molding assembly 200 through the conveying screw 130. At the same time, the heating coil 140 heats the conveying channel 120, so that the material in the conveying channel 120 melts. Finally, the molten material is conveyed into the blow molding assembly 200 through the conveying screw 130 to complete the extrusion work.

[0036] Working principle: When the staff adds the material into the feeding shell 410, the material will fall from the middle of the concentrating shell 420 to the top of the diverting block 430 under the action of gravity. Then, it will spread outwards from the top of the diverting block 430 along the surface of the diverting block 430 until it falls onto the surface of the regulating shell 440. Then, it will fall evenly through the edge of the regulating shell 440 and enter the conveying and melting component 100 through the feeding port. After being heated and melted by the conveying and melting component 100, it will be conveyed to the blow molding component 200 to form a film.

[0037] When it is necessary to control the material feeding rate at the discharge port, the servo motor 442 can be started. The rotating threaded rod 441 of the servo motor 442 will rotate. As the threaded rod 441 rotates, it will drive the inner wall of the adjusting shell 440 to move along its surface, thereby raising and lowering the adjusting shell 440 as a whole. This will adjust the size of the gap between the adjusting shell 440 and the inner wall of the discharge shell 410, thereby controlling the feeding rate.

[0038] It should be noted that the servo motor 442, the conveying and melting component 100, the drive component 300, and the blow molding component 200 mentioned above are all devices with relatively mature existing technologies. The specific models can be selected according to actual needs. At the same time, the servo motor 442 can be powered by the built-in power supply or by the mains power. The specific power supply method can be selected according to the situation, and will not be elaborated here.

[0039] 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. An extrusion mechanism for PVC film, comprising a melting conveying assembly (100), a driving assembly (300), and a blow molding assembly (200), wherein the driving assembly (300) and the blow molding assembly (200) are respectively disposed at both ends of the melting conveying assembly (100), characterized in that: The feeding assembly (400) includes a feeding shell (410) connected to the conveying and melting assembly (100). An adjusting shell (440) is provided inside the feeding shell (410). A fixing shell (450) is fixedly connected to the inner wall of the feeding shell (410). A threaded rod (441) is provided inside the fixing shell (450). The inner wall of the adjusting shell (440) penetrates into the fixing shell (450) and is disposed on the surface of the threaded rod (441).

2. The mechanism for extrusion of PVC film as claimed in claim 1 wherein, A diverter block (430) is fixedly connected to the top of the fixed shell (450). The diverter block (430) is a cone. The fixed shell (450) penetrates the adjusting shell (440). The adjusting shell (440) is located below the diverter block (430).

3. The mechanism for extrusion of PVC film as claimed in claim 1 wherein, A servo motor (442) is fixedly connected to the bottom end of the fixed housing (450). The driving end of the servo motor (442) passes through the fixed housing (450) and is fixedly connected to the bottom end of the threaded rod (441). The adjusting housing (440) is frustum-shaped.

4. The mechanism for extrusion of PVC film as claimed in claim 1 wherein, Two through slots are provided on both sides of the fixed shell (450). The inner wall of the adjusting shell (440) is installed on the surface of the threaded rod (441) through the through slots. A baffle (451) is provided above the through slots and is slidably connected to the inner wall of the fixed shell (450). The cross-sectional area of ​​the baffle (451) is equal to the area of ​​the through slots. A spring (452) is fixedly connected between the baffle (451) and the inner wall of the fixed shell (450).

5. The mechanism for extrusion of PVC film as claimed in claim 1 wherein, The inner wall of the feed shell (410) is fixedly connected to a central shell (420), which is located above the diverter block (430) and is an inverted cylindrical cone.

6. The mechanism for extrusion of PVC film as claimed in claim 1 wherein, The conveying and melting assembly (100) includes a housing (110) and a conveying channel (120) disposed inside the housing (110). The discharge shell (410) penetrates the housing (110) and communicates with the conveying channel (120).

7. The mechanism for extrusion of PVC film as claimed in claim 6 wherein, The conveying channel (120) is rotatably connected to a conveying screw (130), and the end of the conveying screw (130) near the unloading assembly (400) is driven by a drive assembly (300).

8. The mechanism for extrusion of PVC film as claimed in claim 6 wherein, A heating coil (140) is provided between the conveying channel (120) and the inner wall of the outer shell (110). The heating coil (140) is spirally wound around the outer wall of the conveying channel (120). The outlet of the conveying channel (120) is connected to the blow molding assembly (200).

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