Solution pipeline connecting structure of extrusion part of film two-way stretching equipment

Abstract

The utility model relates to the technical field of film stretching, in particular to a solution pipeline connecting structure of an extrusion part of film two-way stretching equipment, which comprises a main extruder and an auxiliary extruder with outlets opposite to each other, and an adapter is arranged in the middle of a connecting line of the two outlets. Metering pumps, start-up valves and fine filters are connected between an outlet of the main extruder and the adapter and between an outlet of the auxiliary extruder and the adapter through solution pipelines, connecting flanges are arranged at the two ends of the solution pipelines, transition plates are arranged between the connecting flanges and inlets and outlets of all devices, material passing channels are formed in the centers of the transition plates, and connecting through holes are formed in the transition plates. The connecting flange, the transition plate and the devices are connected into a whole through connecting screws, and channel ports on the two sides of the material passing channel are in smooth transition fit with the inner diameter of the solution pipeline and the inner diameter of the device inlet and outlet through polishing. According to the device, micro-steps can be prevented from being generated at the joint of the solution pipeline and equipment, residual materials are avoided, crystal points and gels in the plasticizing process of the polyvinegar are effectively controlled, and the quality and the performance of a final product are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of film stretching, in particular to a pipe connection structure for extruding a melt of a film bidirectional stretching device. Background Art

[0002] In recent years, high-end PET film has been widely used in many high-tech fields due to its excellent physical properties, chemical stability and mechanical strength. In the production of high-end PET film, gel and crystal point are two common defects, which have a significant negative impact on the quality and application performance of the film.

[0003] In the current existing technology, the connection between the melt pipes in the film biaxial stretching equipment and the connection between the melt pipe and the equipment generally adopts the stopper positioning connection. The stopper matching tolerance is too small, which makes it difficult to install on site. The current conventional matching tolerance is 0.1-0.2mm, resulting in inaccurate positioning, resulting in micro-steps at the stopper connection in the melt pipe, such as Figure 1 As shown, during use, the micro-steps at the stop will cause material hanging and residual material, and when the pipeline is connected and after the pipeline is connected to the equipment, it is impossible to observe and effectively deal with whether there are micro-steps inside the melt pipeline, which will eventually lead to a decrease in the quality of the produced film products. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a melt pipeline connection structure for the extrusion part of a film biaxial stretching device, which utilizes a transition plate to connect the melt pipeline and the equipment inlet and outlet, thereby avoiding micro-steps and residual materials at the connection, effectively controlling the crystal points and gel in the plasticization process of polyester, and improving the quality and performance of the final product.

[0005] The utility model is realized through the following technical solutions:

[0006] Provided is a melt pipeline connection structure for the extrusion part of a film biaxial stretching device, comprising a main extruder and an auxiliary extruder arranged in parallel, the outlet of the main extruder is directly opposite to the outlet of the auxiliary extruder, and an adapter is arranged in the middle of the connection line of the two outlets, the outlet of the main extruder and the adapter, and the outlet of the auxiliary extruder and the adapter are connected in sequence through a melt pipeline to a metering pump, a start valve and a fine filter, both ends of the melt pipeline are provided with connecting flanges, and a transition plate is further provided between the connecting flange of the melt pipeline and the inlet and outlet of each device, a material passing channel is provided in the center of the transition plate, and the transition plate is provided at the material passing channel. Threaded through holes corresponding to the flange holes on the connecting flange are provided circumferentially, and at least two first locating pin holes are also provided on the transition plate in the circumferential direction of the feed channel. Second locating pin holes facing the first locating pin holes are respectively provided on the connecting flange surface and the inlet and outlet surfaces of the equipment. The connecting flange, the transition plate and each equipment are positioned and matched by locating pins and connected as a whole by connecting screws. The channel port of the feed channel facing the solution pipeline is smoothly transitioned to the inner diameter of the solution pipeline through processing and grinding, and the channel port of the feed channel facing the inlet and outlet of the equipment is smoothly transitioned to the inner diameter of the inlet and outlet of the equipment through processing and grinding.

[0007] Furthermore, an outer jacket is provided on the outside of the fine filter, and heating oil is provided in the outer jacket, and the outer jacket is connected to an oil heater through an oil pipe; a heat conductive sleeve is provided on the outer jacket of the melt pipeline, an electric heater is installed on the outer jacket of the heat conductive sleeve, and an insulation sleeve is provided on the outer jacket of the electric heater.

[0008] The fine filter uses an oil heater to control its temperature to ensure the stability of filtration. The melt pipeline uses electric heating to control the temperature. Together with the outer insulation sleeve, the temperature of the melt pipeline can be kept constant. Each heater is divided into a zone for temperature control, which enables refined temperature control during the melt conveying and filtration process from the extruder outlet to the adapter, ensuring that the reaction is fully carried out and reducing the formation of crystal points.

[0009] Furthermore, a transition plate with a material transfer channel opened in the center is also provided at the connection between the two adjacent sections of the melt pipeline between the adapter and the fine filter. The transition plate is connected to the connecting flanges of the melt pipelines on both sides by bolts and nuts. The two channel ports of the material transfer channel are processed and polished to smoothly transition with the inner diameter of the melt pipeline.

[0010] A transition plate is provided at the interface of two adjacent sections of the melt pipeline, and the two channel ports of the material transfer channel of the transition plate are smoothly adapted to the inner diameter of the melt pipeline respectively, so as to reduce the diameter change of the melt pipeline as much as possible and reduce the occurrence of micro-steps.

[0011] Beneficial effects of the utility model:

[0012] During the melt conveying and filtration process from the extruder outlet to the adapter, a transition plate connection is designed at the interface of the melt pipeline, and the transition plate's material transfer channel is used to smoothly connect the melt pipeline and the equipment's inlet and outlet, minimizing the change in diameter of the melt pipeline and reducing the occurrence of material hanging and residual material due to micro-steps during equipment connection. When the equipment is installed, each connection can be checked for micro-steps, and the transition plate's material transfer channel port can be ground on site after micro-steps are found to achieve a smooth transition at the connection. This can greatly reduce the crystal points and gels in the polyester plasticization process, effectively control the crystal points and gels in the polyester plasticization process, and improve the quality and performance of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of the stopper positioning connection between the melt pipe and the adapter interface in the prior art.

[0014] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 3 It is a schematic diagram of the connection structure between the melt pipe and the adapter in the utility model.

[0016] Figure 4 It is a schematic diagram of the connection structure between the melt pipe and the melt pipe in the utility model.

[0017] Figure 5 It is a structural schematic diagram of the transition plate in the utility model.

[0018] Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure.

[0019] As shown in the figure:

[0020] 1. melt pipeline, 2. adapter, 3. screw, 4. main extruder, 5. metering pump, 6. start valve, 7. fine filter, 8. auxiliary extruder, 9. transition plate, 10. connecting screws, 11. locating pin, 12. connecting flange, 13. material transfer channel, 14. flange hole, 15. threaded through hole, 16. first locating pin hole, 17. second locating pin hole. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0022] A film biaxial stretching device extrusion part melt pipeline connection structure, comprising a main extruder 4 and an auxiliary extruder 8 arranged in parallel, the outlet of the main extruder 4 is directly opposite to the outlet of the auxiliary extruder 8, and an adapter 2 is arranged at the middle position of the connection line between the two outlets, the outlet of the main extruder 4 and the adapter 2, the outlet of the auxiliary extruder 8 and the adapter 2 are connected in sequence through a melt pipeline 1. A metering pump 5, a start valve 6 and a fine filter 7 are connected in sequence through a melt pipeline 1. Both ends of the melt pipeline 1 are provided with a connecting flange 12, and a transition plate 9 is further provided between the connecting flange 12 of the melt pipeline 1 and the inlet and outlet of each device, and a material passing channel 13 is provided in the center of the transition plate 9, and a connecting flange 12 is provided in the circumferential direction of the material passing channel 13. The flange holes 14 on the flange 12 correspond one to one with the threaded through holes 15, and the flange holes 14 are threaded holes. The transition plate 9 is also provided with at least two first positioning pin holes 16 in the circumferential direction of the feed channel 13. The surface of the connecting flange 12 and the inlet and outlet surfaces of the equipment are respectively provided with second positioning pin holes 17 that are opposite to the first positioning pin holes 16. The connecting flange 12, the transition plate 9 and each equipment are positioned and matched by the positioning pins 11 and connected as a whole by the connecting screws 10. The channel port of the feed channel 13 facing the solution pipeline 1 is smoothly transitioned to the inner diameter of the solution pipeline 1 through processing and grinding, and the channel port of the feed channel 13 facing the inlet and outlet of the equipment is smoothly transitioned to the inner diameter of the inlet and outlet of the equipment through processing and grinding.

[0023] The fine filter 7 is provided with an outer jacket body outside, and heating oil is provided in the outer jacket body, and the outer jacket body is connected to the oil heater through an oil pipe; the melt pipeline 1 is provided with a heat-conducting sleeve outside, and an electric heater is installed outside the heat-conducting sleeve, and the electric heater is provided with a heat-insulating sleeve outside.

[0024] A transition plate 9 with a material transfer channel opened in the center is also provided at the connection between the two adjacent sections of the melt pipeline 1 between the adapter 2 and the fine filter 7. The transition plate 9 is connected to the connecting flanges 12 of the melt pipelines 1 on both sides by connecting screws 10. The two channel ports of the material transfer channel 13 are processed and polished to smoothly transition with the inner diameter of the melt pipeline 1.

[0025] The utility model adopts a vertical arrangement of the melt pipeline 1 in the melt conveying and filtering process from the extruder outlet to the adapter 2, so as to shorten the length of the melt pipeline 1 as much as possible and shorten the residence time of the material in the melt pipeline 1. At the same time, in order to coordinate the refinement of the temperature control in the melt conveying and filtering process from the extruder outlet to the adapter 2, the fine filter 7 is heated and insulated by hot oil using an oil heater alone, while the relatively long melt pipeline 1 is temperature controlled by an oil heating unit, and the shorter melt pipeline 1 is temperature controlled by electric heating, and each heater is divided into a zone for temperature control, so as to ensure that the material reaction temperature is properly set to avoid insufficient reaction and the generation of crystal points.

[0026] During the process of melt conveying and filtering from the extruder outlet to the adapter 2, a transition plate 9 is added at the interface of the melt pipeline 1. During installation, the locating pin 11 can be first installed in the first locating pin hole 16 of the transition plate 9, and the two ends of the locating pin 11 extend out of the two ends of the first locating pin hole 16. Then, the transition plate 9 and the outlet or inlet of the equipment are first positioned and installed through the locating pin 11, and the locating pin 11 is inserted into the second locating pin hole 17 on the surface of the outlet or inlet of the equipment. Then, the second locating pin hole 17 on the connecting flange 12 of the melt pipeline 1 is plugged into the locating pin 11, and then the connecting flange 12 of the melt pipeline 1, the transition plate 9 and the equipment are connected as a whole through the connecting screws 10. There is a micro-interference fit between the two ends of the locating pin 11 and the second locating pin hole 17 of the connecting flange 12 and the second locating pin hole 17 on the surface of the equipment, which plays a precise positioning role. Compared with the connection of the threaded through hole 15 with the screw, the positioning pin 11 has higher positioning accuracy, and the tightening and fixing effect of the connecting screw 10 can greatly improve the fineness of the connection, which helps to reduce the occurrence of micro-steps. At the same time, because the connection method of the transition plate 9 is adopted, the two ends of the material transfer channel 13 on the transition plate 9 can be processed separately, and the micro-steps can be observed during installation and disposed of in time after being found, so as to minimize the diameter change of the solution pipeline 1 and reduce the micro-steps occurring during the equipment connection process, thereby avoiding the occurrence of hanging materials, residual materials and the like. During the equipment installation project, it can be checked whether there are micro-steps for each section of the connection. If there are micro-steps, the material transfer channel port of the transition plate can be ground on site to achieve a smooth transition at the connection.

[0027] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A melt pipe connection structure for the extrusion part of a film biaxial stretching device, comprising a main extruder and an auxiliary extruder arranged in parallel, the outlet of the main extruder is directly opposite to the outlet of the auxiliary extruder, and an adapter is arranged in the middle of the connection line of the two outlets, the outlet of the main extruder and the adapter, the outlet of the auxiliary extruder and the adapter are connected in sequence through a melt pipe, a metering pump, a start valve and a fine filter, and connecting flanges are arranged at both ends of the melt pipe, characterized in that: A transition plate is also arranged between the connecting flange of the solution pipeline and the inlet and outlet of each device. A material passing channel is provided in the center of the transition plate. The transition plate is provided with threaded through holes corresponding to the flange holes on the connecting flange in the circumferential direction of the material passing channel. The transition plate is also provided with at least two first positioning pin holes in the circumferential direction of the material passing channel. The connecting flange surface and the inlet and outlet surfaces of the equipment are respectively provided with second positioning pin holes opposite to the first positioning pin holes. The connecting flange, the transition plate and each device are positioned and matched by positioning pins and connected as a whole through connecting screws. The channel port of the material passing channel facing the solution pipeline is smoothly transitioned to the inner diameter of the solution pipeline through processing and grinding, and the channel port of the material passing channel facing the inlet and outlet of the equipment is smoothly transitioned to the inner diameter of the inlet and outlet of the equipment through processing and grinding.

2. The film biaxial stretching equipment extrusion part melt pipe connection structure according to claim 1, characterized in that: An outer jacket is arranged outside the fine filter, and heating oil is arranged in the outer jacket, and the outer jacket is connected to the oil heater through an oil pipe; a heat-conducting jacket is arranged outside the melt pipeline, an electric heater is installed outside the heat-conducting jacket, and an insulation jacket is arranged outside the electric heater.

3. The film biaxial stretching equipment extrusion part melt pipe connection structure according to claim 1, characterized in that: A transition plate with a material transfer channel opened in the center is also provided at the connection between the two adjacent sections of the melt pipeline between the adapter and the fine filter. The transition plate is connected to the connecting flanges of the melt pipelines on both sides by connecting screws, and the two channel ports of the material transfer channel are processed and polished to smoothly transition with the inner diameter of the melt pipeline.

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