Downward film blowing equipment with film diameter adjusting and secondary stretching functions

Abstract

The utility model discloses a lower film blowing device with film diameter adjusting and secondary stretching functions. The feeding mechanism feeds molten plastic flow into the film blowing head to blow out an annular film, the annular film is cooled and shaped by the cooling ring and then enters the reducing assembly, and the annular film is flattened and passes through the reducing feeding clamping roller and then passes through the film reducing through hole of the heating cylinder and the reducing discharging clamping roller. Due to the fact that the heating cylinder can heat the annular membrane for the second time, the annular membrane can be deformed, the air injection and exhaust mechanism can inject air into or exhaust air out of the inner space of the annular membrane in the membrane reducing through hole, and the amount of air in the annular membrane between the reducing feeding clamping roller and the reducing discharging clamping roller can be adjusted. The larger the air amount is, the larger the diameter expansion amount of the annular diaphragm is, so that the diameter of the annular diaphragm is adjustable, the final diaphragm width can meet the requirement, diaphragms of various widths can be continuously produced, the cooling ring does not need to be replaced, the influence on the production efficiency is reduced, and the material loss is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a film blowing machine, especially to a lower film blowing equipment with film diameter adjustment and secondary stretching function. BACKGROUND

[0002] Some existing lower film blowing equipment, including film blowing assembly and control module. Film blowing assembly includes film blowing head, feeding mechanism and cooling ring, feeding mechanism sends molten plastic flow into film blowing head, film blowing head blows out annular film piece, then annular film piece is cooled and shaped through cooling ring, then is collected and processed, and plastic film piece is prepared. However, the diameter of the annular film piece is basically the same as the inner diameter of the cooling ring at present, when it is needed to adjust the diameter of the annular film piece slightly, it is needed to stop to replace cooling rings of different specifications, and it is needed to waste a part of length of annular film piece, which influences the production efficiency and production material loss of the lower film blowing equipment. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. For this purpose, the utility model provides a lower film blowing equipment with film diameter adjustment and secondary stretching function, which can reduce the influence on production efficiency and material loss.

[0004] The lower film blowing equipment with film diameter adjustment and secondary stretching function according to the utility model embodiment, including frame, film blowing assembly, variable diameter assembly. Film blowing assembly is arranged in the frame, and the film blowing assembly includes film blowing head, feeding mechanism and cooling ring, the feeding mechanism is connected with the film blowing head, the film blowing head is provided with annular film piece outlet, and the cooling ring is located on the discharging side of the annular film piece outlet. Variable diameter assembly is arranged in the frame, and the variable diameter assembly includes heating cylinder, variable diameter feeding clamp roller, variable diameter discharging clamp roller and injection and exhaust mechanism, the heating cylinder is provided with film piece variable diameter through hole, the film piece variable diameter through hole is provided with feeding end and discharging end, the variable diameter feeding clamp roller is arranged corresponding to the feeding end of the film piece variable diameter through hole, the variable diameter discharging clamp roller is arranged corresponding to the discharging end of the film piece variable diameter through hole, and the injection and exhaust mechanism is located between the variable diameter feeding clamp roller and the variable diameter discharging clamp roller and can inject gas or exhaust gas into the annular film piece internal space.

[0005] The lower-blowing film equipment with the membrane diameter adjusting and secondary stretching functions has at least the following beneficial effects: the feeding mechanism sends the molten plastic flow into the blowing film head to blow out the annular film sheet, the annular film sheet is cooled and shaped by the cooling ring, and then enters the variable-diameter assembly; the annular film sheet is flattened and passes through the variable-diameter feeding clamp roller, and then passes through the membrane diameter variable hole of the heating cylinder and the variable-diameter discharging clamp roller; the heating cylinder can secondarily heat the annular film sheet, so that the annular film sheet can be deformed; the air injection and exhaust mechanism can inject air into the internal space of the annular film sheet in the membrane diameter variable hole or exhaust air, that is, the internal air amount of the annular film sheet between the variable-diameter feeding clamp roller and the variable-diameter discharging clamp roller can be adjusted; the greater the air amount is, the greater the diameter expansion amount of the annular film sheet is; and therefore, the diameter of the annular film sheet can be adjusted, so that the final film sheet width can meet the requirements, and the film sheets of various widths can be continuously produced without replacing the cooling ring, thereby reducing the influence on the production efficiency and reducing material loss.

[0006] According to some embodiments of the utility model, the air injection and exhaust mechanism includes a venting needle, an air pump and a first moving driver, the air pump is communicated with the venting needle, the venting needle is movably arranged on the rack and can be inserted into or separated from the annular film sheet, and the first moving driver is used for driving the venting needle to insert into or separate from the annular film sheet.

[0007] According to some embodiments of the utility model, the air injection and exhaust mechanism further includes a second moving driver, the venting needle is movably arranged on the rack and can move along the hole axis direction of the membrane diameter variable hole, and the second moving driver is used for driving the venting needle to move along the hole axis direction of the membrane diameter variable hole.

[0008] According to some embodiments of the utility model, the rotation speed of the variable-diameter feeding clamp roller and / or the variable-diameter discharging clamp roller can be adjusted.

[0009] According to some embodiments of the utility model, the rack is provided with a control module, the variable-diameter assembly further includes a first rotation driver and a second rotation driver, the first rotation driver is used for driving the variable-diameter feeding clamp roller to rotate, the second rotation driver is used for driving the variable-diameter discharging clamp roller to rotate, the first rotation driver and the second rotation driver are electrically connected with the control module, and the control module can control the rotation speed of the first rotation driver and the second rotation driver.

[0010] According to some embodiments of the utility model, the heating cylinder is provided with a variable-diameter heater, and the heating temperature of the variable-diameter heater can be adjusted.

[0011] According to some embodiments of the present application, the film blowing assembly further comprises a first flattening mechanism, which is located between the cooling ring and the diameter changing assembly, and the first flattening mechanism comprises two oppositely arranged guide plates, and the distance between the two guide plates gradually decreases along the advancing direction of the annular film.

[0012] According to some embodiments of the present application, at least two feeding mechanisms are provided, and all the feeding mechanisms are respectively communicated with the film blowing head, and the film blowing head is a co-extrusion film blowing head.

[0013] According to some embodiments of the present application, a heat setting assembly is further provided, which is arranged on the rack and located in the discharging direction of the diameter changing assembly, and the heat setting assembly comprises a heating compartment and a plurality of setting rollers, the setting rollers are rotationally arranged in the heating compartment, and the annular film sequentially passes through the setting rollers.

[0014] According to some embodiments of the present application, the setting rollers are alternately arranged in up and down directions along the left-to-right direction.

[0015] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0017] Fig. 1 FIG. 1 is a schematic view of a film blowing assembly of a film blowing device according to an embodiment of the present application;

[0018] Fig. 2 FIG. 2 is a schematic view of a diameter changing assembly and a heat setting assembly of a film blowing device according to an embodiment of the present application;

[0019] Fig. 3 FIG. 3 is a schematic view of a principle of a film blowing device according to an embodiment of the present application.

[0020] REFERENCE NUMERALS:

[0021] rack 100;

[0022] film blowing assembly 200, film blowing head 210, feeding mechanism 220, cooling ring 230, first flattening mechanism 240, guide plate 241;

[0023] diameter changing assembly 300, heating cylinder 310, film diameter changing through hole 311, diameter changing feeding clamp roller 320, diameter changing discharging clamp roller 330, air injection and exhaust mechanism 340, second flattening mechanism 350;

[0024] Heat setting assembly 400, heating chamber 410, setting roller 420;

[0025] Pulling roller 510, rotating guide device 520;

[0026] Annular film 600. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are merely intended to explain the present application, and cannot be understood as limiting the present application.

[0028] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application in indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0029] In the description of the present application, the plural refers to two or more. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0031] Some existing down-blowing film equipment includes a film blowing assembly and a control module. The film blowing assembly includes a film blowing head, a feeding mechanism and a cooling ring. After the feeding mechanism sends the molten plastic flow into the film blowing head, the film blowing head blows out an annular film, and then the annular film is cooled and shaped by the cooling ring, and then is flattened and post-processed to obtain a plastic film. The diameter of the current annular film is basically the same as the inner diameter of the cooling ring. When it is necessary to slightly adjust the diameter of the annular film, it is necessary to stop the machine to replace the cooling ring of different specifications, and a part of the length of the annular film needs to be wasted, which affects the production efficiency and production material loss of the down-blowing film equipment. The existing down-blowing film equipment can also cut off a part of the film edge material by a cutting mechanism to obtain a film product of a specified width, but this method wastes more materials.

[0032] REFERENCE Figs. 1 to 3The utility model discloses a lower blow film equipment with membrane diameter adjustment and secondary stretching function, including frame 100, blow film subassembly 200, variable diameter subassembly 300. Blow film subassembly 200 sets up in frame 100, and blow film subassembly 200 includes blow film head 210, feed mechanism 220 and cooling ring 230, and feed mechanism 220 is connected with blow film head 210, and blow film head 210 is provided with annular membrane sheet outlet, and cooling ring 230 is located the discharge side of annular membrane sheet outlet, variable diameter subassembly 300 sets up in frame 100, and variable diameter subassembly 300 includes heating cylinder 310, variable diameter feed clamp roller 320, variable diameter discharge clamp roller 330 and injection exhaust mechanism 340, and heating cylinder 310 is provided with membrane sheet variable diameter through -hole 311, and membrane sheet variable diameter through -hole 311 is provided with feed end and discharge end, and variable diameter feed clamp roller 320 is set up corresponding the feed end of membrane sheet variable diameter through -hole 311, and variable diameter discharge clamp roller 330 is set up corresponding the discharge end of membrane sheet variable diameter through -hole 311, and injection exhaust mechanism 340 is located between variable diameter feed clamp roller 320 and variable diameter discharge clamp roller 330 and can inject gas or exhaust to annular membrane sheet internal space.

[0033] Feed mechanism 220 sends the molten plastic stream into blow film head 210 and blows out annular membrane sheet, and after annular membrane sheet is cooled and shaped by cooling ring 230, enters variable diameter subassembly 300, and annular membrane sheet is collected and is flat through variable diameter feed clamp roller 320, and then passes through the membrane sheet variable diameter through -hole 311 of heating cylinder 310 and variable diameter discharge clamp roller 330, because heating cylinder 310 can heat annular membrane sheet secondarily, so that annular membrane sheet can be deformed, injection exhaust mechanism 340 can inject air or exhaust to the internal space of annular membrane sheet in membrane sheet variable diameter through -hole 311, that is, can adjust the internal air amount of annular membrane sheet between variable diameter feed clamp roller 320 and variable diameter discharge clamp roller 330, and the greater the air amount is, the greater the diameter expansion of annular membrane sheet is, thereby making the diameter of annular membrane sheet adjustable, so that the final membrane sheet width can meet the demand, and a plurality of widths of membrane sheet can be continuously produced without replacing cooling ring 230, thereby reducing the influence on production efficiency and reducing material loss.

[0034] Specifically, the discharge direction in the embodiment refers to the moving forward direction of the membrane sheet, and does not represent the spatial orientation of the equipment.

[0035] It should be understood that the air inside the annular membrane sheet will expand in the heating cylinder 310, and under the action of the internal and external pressure difference, the diameter of the annular membrane sheet will expand until the deformation resistance of the annular membrane sheet and the internal and external air pressure difference reach equilibrium.

[0036] Specifically, the secondary heating of the heating cylinder 310 can restore the deformation ability of the annular membrane sheet, so that the diameter of the annular membrane sheet can change, and can also have a certain heat setting effect on the annular membrane sheet, so that the strength of the annular membrane sheet is higher.

[0037] In an embodiment, the air injection and exhaust mechanism 340 comprises an air injection needle, an air pump and a first moving driver, the air pump is in communication with the air injection needle, the air injection needle is movably arranged on the rack 100 and can be inserted into or separated from the annular diaphragm, and the first moving driver is used to drive the air injection needle to be inserted into or separated from the annular diaphragm.

[0038] In the initial state, the annular diaphragm has a certain amount of air in the annular diaphragm inside the variable-diameter through hole 311. When it is needed to inject air into the annular diaphragm, the first moving driver can drive the air injection needle to be inserted into the annular diaphragm, the air pump injects air into the annular diaphragm through the air injection needle, and then the air injection needle is pulled out, so as to increase the amount of air in the annular diaphragm, and at this time, the diameter of the annular diaphragm can be increased, that is, the width of the flattened diaphragm is finally increased.

[0039] When it is needed to reduce the amount of air in the annular diaphragm, the air injection needle can be used to pierce the annular diaphragm, and the air in the annular diaphragm is slowly exhausted through the piercing hole. Alternatively, the air injection and exhaust mechanism 340 further comprises an exhaust cutter, which can be manually operated by a production worker to pierce a small hole in the annular diaphragm to exhaust the air in the annular diaphragm, or the air injection needle can be inserted into the annular diaphragm, and the air pump and the air injection needle are used to suck the air in the annular diaphragm, so as to reduce the amount of air in the annular diaphragm, and then the air injection needle is pulled out.

[0040] It can be understood that in other embodiments, the air injection and exhaust mechanism 340 can further separately provide an air injection needle, an air pump and an air exhaust needle, the air injection needle is in communication with the air pump, air is injected into the annular diaphragm through the air injection needle, and the air in the annular diaphragm is exhausted through the air exhaust needle; alternatively, the air exhaust needle can be replaced by a hole-punching cutter; the air injection and exhaust mechanism 340 can also manually move the air injection needle and the air exhaust needle by a production worker to perform air injection or air exhaust.

[0041] In an embodiment, the air injection and exhaust mechanism 340 further comprises a second moving driver, the air injection needle is movably arranged on the rack 100 and can move along the hole axis direction of the variable-diameter through hole 311 of the diaphragm, and the second moving driver is used to drive the air injection needle to move along the hole axis direction of the variable-diameter through hole 311 of the diaphragm. Since the annular diaphragm is kept moving in the production process of the downward-blowing film device, the air injection and exhaust mechanism 340 is provided with the second moving driver to drive the air injection needle to move along the hole axis direction of the variable-diameter through hole 311 of the diaphragm, so that the air injection needle can keep moving at the same speed as the annular diaphragm to avoid the air injection needle staying at the original position to perform air injection or air exhaust. When the air injection needle is inserted into the annular diaphragm, the air injection needle moves synchronously with the annular diaphragm; when the air injection needle is pulled out, the air injection needle is reset to move for the next time of insertion into the annular diaphragm.

[0042] Specifically, the venting needle can be slidably arranged on the moving table along the radial direction of the membrane variable-diameter through hole 311 through the guide column guide sleeve structure or the sliding rail sliding block structure, and the moving table is slidably arranged in the heating cylinder 310 along the hole axis direction of the membrane variable-diameter through hole 311 through the guide column guide sleeve structure or the sliding rail sliding block structure, so that the venting needle can be inserted into or separated from the annular membrane, and the venting needle can move along the hole axis direction of the membrane variable-diameter through hole 311.

[0043] Specifically, the first moving driver can adopt a structure such as a pneumatic cylinder, an oil cylinder, or an electric cylinder, to drive the venting needle to insert into or separate from the annular membrane. The second moving driver can adopt a structure such as a motor cooperating with a lead screw and a lead screw nut to drive the moving table to move synchronously with the annular membrane, or a controllable speed linear driver such as a linear motor.

[0044] It can be understood that the first moving driver and the second moving driver can also adopt a three-axis mechanical hand, or a production personnel manually controls the venting needle to insert into or separate from the annular membrane, and manually controls the venting needle to move at the same speed as the annular membrane.

[0045] Since the variable-diameter feeding clamp roller 320 and the variable-diameter discharging clamp roller 330 can clamp the annular membrane, when the air injection and exhaust mechanism 340 is not used, the amount of air in the annular membrane between the variable-diameter feeding clamp roller 320 and the variable-diameter discharging clamp roller 330 remains basically unchanged, so that the diameter of the output annular membrane remains stable.

[0046] In the embodiment, the rotating speed of the variable-diameter feeding clamp roller 320 and the variable-diameter discharging clamp roller 330 can be adjusted. When the amount of air in the annular membrane between the variable-diameter feeding clamp roller 320 and the variable-diameter discharging clamp roller 330 remains basically unchanged, if the speed of the variable-diameter discharging clamp roller 330 is greater than the speed of the variable-diameter feeding clamp roller 320, a stretching phenomenon can occur to the annular cylinder membrane, i.e., the diameter of the annular membrane is reduced, so that the width of the finally prepared membrane is reduced; in this case, if a part of the gas in the annular membrane is exhausted by using the air injection and exhaust mechanism 340, the diameter of the annular membrane can be quickly reduced. When the speed of the variable-diameter discharging clamp roller 330 is less than or equal to the speed of the variable-diameter feeding clamp roller 320, the diameter of the annular membrane can be increased.

[0047] In the embodiment, the rack 100 is provided with a control module, the variable-diameter assembly 300 further comprises a first rotation driver for driving the variable-diameter feeding clamp roller 320 to rotate and a second rotation driver for driving the variable-diameter discharging clamp roller 330 to rotate, and the first rotation driver and the second rotation driver are electrically connected with the control module through a PLC program, and the control module can control the rotation speed of the first rotation driver and the second rotation driver. The rotation speed of the first rotation driver and the second rotation driver is controlled respectively by the control module, so as to control the speed of the variable-diameter feeding clamp roller 320 and the variable-diameter discharging clamp roller 330 respectively, thereby realizing the adjustment of the speed difference between the variable-diameter discharging clamp roller 330 and the variable-diameter feeding clamp roller 320, and the structure is relatively simple and easy to implement.

[0048] Specifically, the first rotation driver and the second rotation driver can adopt, for example, a servo motor or other output rotation power structure, and the rotation speed is relatively accurately adjusted by the control module.

[0049] It can be imagined that, in some embodiments, the rotation speed of the variable-diameter feeding clamp roller 320 can be adjusted, and the speed of the variable-diameter discharging clamp roller 330 cannot be adjusted; or the speed of the variable-diameter feeding clamp roller 320 cannot be adjusted, and the speed of the variable-diameter discharging clamp roller 330 can be adjusted, and the speed difference between the variable-diameter discharging clamp roller 330 and the variable-diameter feeding clamp roller 320 can also be formed, which can be specifically selected according to actual needs by those skilled in the art. Specifically, as the speed difference between the variable-diameter discharging clamp roller 330 and the variable-diameter feeding clamp roller 320 increases, the diameter of the annular diaphragm gradually decreases.

[0050] In the embodiment, the heating cylinder 310 is provided with a variable-diameter heater, and the heating temperature of the variable-diameter heater can be adjusted. When the temperature of the variable-diameter heater increases, the internal temperature of the heating cylinder 310 increases, the deformation resistance of the annular diaphragm decreases, so that the diameter of the annular diaphragm increases under the condition that the amount of air in the annular diaphragm is unchanged; when the temperature of the variable-diameter heater decreases, the internal temperature of the heating cylinder 310 decreases, thereby increasing the deformation resistance of the annular diaphragm, so that the diameter of the annular diaphragm decreases under the condition that the amount of air in the annular diaphragm is unchanged.

[0051] Specifically, the variable-diameter assembly 300 can have several effects on the annular diaphragm:

[0052] When the speed of the variable-diameter discharging clamp roller 330 is greater than the speed of the variable-diameter feeding clamp roller 320, the diameter of the annular diaphragm can be reduced under the condition that other parameters are unchanged; when the speed of the variable-diameter discharging clamp roller 330 is equal to the speed of the variable-diameter feeding clamp roller 320, the diameter of the annular diaphragm is basically unchanged, which is equivalent to heat setting the annular diaphragm once; when the speed of the variable-diameter discharging clamp roller 330 is less than the speed of the variable-diameter feeding clamp roller 320, the diameter of the annular diaphragm can be increased.

[0053] When the air injection mechanism 340 is used to inject air into the annular film, the diameter of the tubular film can be increased, and when the air injection mechanism 340 is used to exhaust air in the annular film, the diameter of the tubular film can be reduced.

[0054] When the temperature of the heating cylinder 310 is increased, the diameter of the annular film can be increased, and when the temperature of the heating cylinder 310 is reduced, the diameter of the annular film can be reduced.

[0055] It should be understood that when the diameter of the annular film is increased, the thickness of the annular film is also thinned, so that the film thickness that cannot be formed by conventional blowing film method can be produced by the above structure, and the same amount of material can be made into a larger area of the film, thereby improving the economic benefit.

[0056] In the embodiment, the film blowing assembly 200 further comprises a first flattening mechanism 240, which is located between the cooling ring 230 and the diameter changing assembly 300, and the first flattening mechanism 240 comprises two oppositely arranged guide plates 241, and the distance between the two guide plates 241 gradually decreases along the advancing direction of the annular film. Since the film blown out by the film blowing head 210 is annular, the annular film still maintains the annular shape after passing through the cooling ring 230, which is not conducive to the guiding and conveying by the roller body and the entering into the diameter changing assembly 300. Therefore, the first flattening mechanism 240 is arranged, and the distance between the two oppositely arranged guide plates 241 gradually decreases along the advancing direction of the annular film, so that the annular film can be gradually flattened to facilitate the guiding and conveying by the roller body. Specifically, the guide plate 241 can be provided with air injection holes to reduce the direct contact between the film and the guide plate 241.

[0057] In the embodiment, the feeding mechanism 220 is provided with at least two, and all the feeding mechanisms 220 are respectively communicated with the film blowing head 210, and the film blowing head 210 is a co-extrusion film blowing head 210. The plurality of feeding mechanisms 220 simultaneously feed the film blowing head 210, which is convenient for producing co-extrusion film. Specifically, the number of feeding mechanisms 220 can be two, three, four, five or more, which can be specifically selected by those skilled in the art according to actual needs. For example, when the co-extrusion film blowing head is a 2N+1 layer co-extrusion, N feeding mechanisms 220 are needed to correspond thereto.

[0058] In the embodiment, a shaping assembly is further included, and the heat setting assembly 400 is arranged on the rack 100 and located in the discharging direction of the diameter changing assembly 300, and the heat setting assembly 400 comprises a heating compartment 410 and a plurality of shaping rollers 420, and the shaping rollers 420 are rotationally arranged in the heating compartment 410, and the annular film sequentially passes through each shaping roller 420. The annular film sequentially passes through the plurality of shaping rollers 420, and the heating compartment 410 can heat set the annular film passing therethrough, thereby improving the thermal stability of the annular film.

[0059] In the embodiment, the shaping rollers 420 are arranged alternately up and down in the left-to-right direction, so that each shaping roller 420 can be arranged relatively compactly in the heating chamber 410, the space utilization is high, the length of the annular film in the heating chamber 410 is increased as much as possible, and the heat setting effect is improved. The entering side and the output side of the heating chamber 410 are provided with traction rollers 510 to facilitate the traction of the film into and out of the heating chamber 410. The heating chamber 410 can be heated by the way of hot air circulation, so that the heating chamber 410 maintains a suitable heating temperature, and saves energy.

[0060] Specifically, the cooling ring 230 is cooled by the way of cold water circulation combined with vacuum sizing.

[0061] Specifically, the first flattening mechanism 240 is provided with a traction roller 510 and a rotary guide device 520 in the discharging direction, the rotary guide device 520 can rotate and guide the film, reduce the unevenness or wrinkle phenomenon of the film after winding, and improve the strength and appearance quality of the film.

[0062] Specifically, the rotary guide device 520 is provided with a variable diameter assembly 300 in the discharging direction, and the variable diameter assembly 300 is also provided with a second flattening mechanism 350 between the heating cylinder 310 and the variable diameter discharging clamp roller 330 to assist in flattening the annular film after variable diameter.

[0063] Specifically, the variable diameter assembly 300 is provided with a heat setting assembly 400 in the discharging direction, and the heat setting assembly 400 is provided with a cooling device in the discharging direction, which can cool the film. The cooling device is provided with a thickness measuring device in the discharging direction, which can detect the thickness of the film.

[0064] Specifically, the thickness measuring device is provided with a traction device and a corona device in the discharging direction, the corona device can improve the surface adhesion of the film and facilitate use. The corona device is provided with a winding device in the discharging direction, which can wind the film to obtain the film product.

[0065] Specifically, a deviation correcting device can be arranged at the entering position of part of the feeding rollers, for example, the film passes through the deviation correcting device for deviation correction before entering the variable diameter assembly 300, and then enters the variable diameter feeding clamp roller 320, and the film passes through the deviation correcting device for deviation correction before entering the heat setting assembly 400, and then enters the heating chamber 410, etc., which can be specifically selected by those skilled in the art according to actual needs.

[0066] In the embodiment, the film sheet outlet of the film blowing head 210 is arranged downward, and the upper and lower heights of the cooling ring 230 are adjustable, so that the cooling ring 230 can be applied to film blowing heads 210 of different heights, the universality of the cooling ring 230 is better, and the position of the cooling ring 230 can be adjusted according to the production process requirements of the annular film sheet of different materials. Specifically, the cooling ring 230 is slidingly connected to the rack 100, and the upper and lower heights can be adjusted through the structure of the motor, the lead screw and the lead screw nut.

[0067] In the embodiment, the angle and distance between the two guide plates 241 of the first flattening mechanism 240 are adjustable to adapt to film sheets of different process requirements, and the flattening effect of the film sheet can be reasonably adjusted. Specifically, the guide plates 241 are arranged in the up-down direction, the upper part of the guide plates 241 is adjusted in the left-right position through the first left-right adjusting structure, and the lower part of the guide plates 241 is also adjusted in the left-right position through the second left-right adjusting mechanism, so that the inclination angle and position of the guide plates 241 can be adjusted. The first left-right adjusting structure adopts a dial wheel cooperating with a lead screw and a lead screw nut structure, and the second left-right adjusting structure adopts a roller cooperating with a linear driver. The lower part of the guide plates 241 is slidingly connected to the rack 100 through the roller, and the linear driver is pivoted with the roller and drives the roller to move left and right. It can be understood that in other embodiments, the first left-right adjusting structure and the second left-right adjusting structure can both adopt an electric cylinder, one end of which is pivoted with the guide plates 241.

[0068] Specifically, the first flattening mechanism 240 is installed on the rotating guide device 520.

[0069] Specifically, the control module can adopt a device computer or other types of control systems for control.

[0070] Specifically, the production process of the lower film blowing equipment in the embodiment is as follows: the feeding mechanism 220 extrudes the molten flow after mixing the plastic particles according to the proportion, the molten flow is blown into an annular film sheet through the film blowing head 210, and the film sheet is flattened by the first flattening mechanism 240 after being cooled by the cooling ring 230. Then, the film sheet enters the rotating guide device 520 through the traction roller 510, then the diameter is adjusted through the diameter changing assembly 300, then the film sheet is corrected through the correction device, then the film sheet is heat set through the heat setting assembly 400, and then the film sheet is cooled through the cooling device. Then, the thickness of the film sheet is detected. When the thickness of the film sheet meets the requirements, the film sheet is guided to the corona device for corona treatment by the traction device, and then the film sheet is wound into a film roll by the winding device. When the thickness of the film sheet does not meet the requirements, the film sheet is pulled to the crushing device by the traction device for waste crushing, and then the recovered raw materials are sent to the feeding mechanism 220 for reuse. The corona device can be divided into an inner corona part and an outer corona part to perform corona treatment on the inner side and the outer side of the film sheet, respectively.

[0071] Specifically, the diameter changing assembly (300) can reduce the diameter of the annular film by no more than 30% or increase the diameter of the annular film by no more than 10% in the process of the film blowing head 210 blowing the annular film. The diameter changing assembly (300) can adjust the diameter of the annular film, i.e., the width of the film after being flattened, to control the uniformity of the thickness of the annular film.

[0072] Specifically, the diameter change ΔOX is positively correlated with the heating temperature T of the diameter changing assembly 300 and the internal pressure P of the annular film, and is negatively correlated with the speed difference ΔV of the diameter changing outfeed clamp roller 330 and the diameter changing infeed clamp roller 320, for example, f(ΔOX)=k1f(T)+k2f(P)-k3f(ΔV)+m, wherein k1, k2, and k3 are variable constants of the temperature, the pressure, and the speed difference, respectively, and m is a constant related to the film material.

[0073] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements, and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A down-blowing film apparatus having a film diameter adjusting and secondary stretching function, characterized by, The application relates to a film blowing device. The device comprises a rack (100), a film blowing assembly (200) arranged on the rack (100), the film blowing assembly (200) comprising a film blowing head (210), a feeding mechanism (220) and a cooling ring (230), the feeding mechanism (220) being connected with the film blowing head (210), the film blowing head (210) being provided with a ring-shaped film outlet, and the cooling ring (230) being arranged on the discharge side of the ring-shaped film outlet. The device further comprises a variable-diameter assembly (300) arranged on the rack (100), the variable-diameter assembly (300) comprising a heating cylinder (310), a variable-diameter feeding clamp roller (320), a variable-diameter discharge clamp roller (330) and an air injection and exhaust mechanism (340), the heating cylinder (310) being provided with a film variable-diameter through hole (311), the film variable-diameter through hole (311) being provided with a feeding end and a discharge end, the variable-diameter feeding clamp roller (320) being arranged corresponding to the feeding end of the film variable-diameter through hole (311), the variable-diameter discharge clamp roller (330) being arranged corresponding to the discharge end of the film variable-diameter through hole (311), and the air injection and exhaust mechanism (340) being arranged between the variable-diameter feeding clamp roller (320) and the variable-diameter discharge clamp roller (330) and capable of injecting or exhausting air into the internal space of the ring-shaped film. The air injection and exhaust mechanism (340) comprises an air injection needle, an air pump and a first moving driver, the air pump being communicated with the air injection needle, the air injection needle being movably arranged on the rack (100) and capable of penetrating into or separating from the ring-shaped film, and the first moving driver being used for driving the air injection needle to penetrate into or separate from the ring-shaped film.

2. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 1, characterized in that: The air injection and exhaust mechanism (340) further comprises a second moving driver, the air injection needle being movably arranged on the rack (100) and capable of moving along the hole axis direction of the film variable-diameter through hole (311), and the second moving driver being used for driving the air injection needle to move along the hole axis direction of the film variable-diameter through hole (311).

3. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 2, characterized in that: The rotation speed of the variable-diameter feeding clamp roller (320) and / or the variable-diameter discharge clamp roller (330) can be adjusted.

4. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 1, characterized in that: The rack (100) is provided with a control module, the variable-diameter assembly (300) further comprises a first rotation driver and a second rotation driver, the first rotation driver being used for driving the variable-diameter feeding clamp roller (320) to rotate, the second rotation driver being used for driving the variable-diameter discharge clamp roller (330) to rotate, the first rotation driver and the second rotation driver being electrically connected with the control module, and the control module being capable of controlling the rotation speed of the first rotation driver and the second rotation driver.

5. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 4, characterized in that: The heating cylinder (310) is provided with a variable-diameter heater, and the heating temperature of the variable-diameter heater can be adjusted.

6. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 1, wherein: The film blowing assembly (200) further comprises a first flattening mechanism (240), the first flattening mechanism (240) being arranged between the cooling ring (230) and the variable-diameter assembly (300), and the first flattening mechanism (240) comprising two oppositely arranged guide plates (241), the distance between the two guide plates (241) gradually decreasing along the advancing direction of the ring-shaped film.

7. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 1, wherein: ​ 8. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 1, wherein: The feeding mechanism (220) is provided with at least two, all the feeding mechanism (220) is communicated with the film blowing head (210) respectively, the film blowing head (210) is co-extrusion film blowing head (210).

9. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 1, wherein: Further comprising heat setting assembly (400), the heat setting assembly (400) is arranged in the rack (100) and is located in the discharging direction of the variable diameter assembly (300), the heat setting assembly (400) includes heating compartment (410) and multiple setting rollers (420), the setting roller (420) is rotationally arranged in the heating compartment (410), the annular film piece sequentially passes each setting roller (420).

10. The down-blowing film apparatus having a function of adjusting a film diameter and secondary stretching according to claim 9, wherein: In the direction from left to right, the setting roller (420) is alternately arranged up and down.

Images