Device for controlling diameter of film bubble

Abstract

The utility model relates to a device for controlling the diameter of a film bubble, and relates to the technical field of film blowing equipment. The device comprises a film bubble stabilizing mechanism and a film bubble diameter adjusting mechanism, the film bubble stabilizing mechanism comprises a bubble stabilizing assembly and a film bubble flattening assembly, the bubble stabilizing assembly is arranged at the outlet end of the film blowing machine and used for supporting film bubbles, and the film bubble flattening assembly is arranged on the side, away from the outlet end of the film blowing machine, of the bubble stabilizing assembly and used for flattening the film bubbles to form films; the film bubble diameter adjusting mechanism comprises a film width measuring assembly and an exhaust assembly, the film width measuring assembly is used for measuring the width of a film, and the exhaust assembly is arranged at the outlet end of the film blowing machine and used for exhausting part of gas going to enter the film bubble. According to the device for controlling the diameter of the film bubble, accurate control over the diameter of the film bubble can be achieved, and then the shrinkage rate of a product is controlled.

Description

Technical Field

[0001] The present application relates to the technical field of film blowing equipment, and in particular to a device for controlling the diameter of a film bubble. Background Art

[0002] Blown film refers to a plastic film prepared by a blow molding process, and its preparation method includes: extruding the resin material into a thin-walled tube after melting and plasticization, and then using compressed air to blow it into a film bubble under the action of a traction device, and finally obtaining a plastic film after traction, cooling and shaping. For some resin materials, such as polyvinyl chloride (PVC), due to its poor thermal stability, it will produce gas during the heating process, and the gas and compressed air will inflate the thin-walled tube together; because the amount of gas generated by the resin material during the heating process is difficult to control, it will cause the volume (diameter) of the film bubble during the blowing process to change, and then cause the performance of the prepared plastic film (such as lateral shrinkage) to change. Therefore, how to control the diameter of the film bubble is a problem that needs to be solved. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a device for controlling the diameter of the film bubble, which can accurately control the diameter of the film bubble and thereby control the shrinkage rate of the product.

[0004] The present application provides a device for controlling the diameter of a film bubble, comprising:

[0005] A film bubble stabilizing mechanism, the film bubble stabilizing mechanism comprising a film bubble stabilizing component and a film bubble flattening component, the film bubble stabilizing component is arranged at the outlet end of the film blowing machine and is used to support the film bubble, the film bubble flattening component is arranged on the side of the film stabilizing component away from the outlet end of the film blowing machine, and is used to flatten the film bubble to form a film sheet;

[0006] The film bubble diameter adjustment mechanism comprises a film width measuring component and an exhaust component. The film width measuring component is used to measure the width of the film. The exhaust component is arranged at the outlet end of the film blowing machine and is used to exhaust part of the gas that is about to enter the film bubble.

[0007] In some embodiments of the present application, the bubble stabilizing component includes two opposite supporting parts, and the distance between the two supporting parts gradually decreases along the direction approaching the membrane bubble flattening component.

[0008] In some embodiments of the present application, the supporting component includes a plurality of guide rollers and a bracket supporting the plurality of guide rollers, and the plurality of guide rollers are arranged at intervals along the outlet end of the film blowing machine toward the film bubble flattening assembly.

[0009] In some embodiments of the present application, the film bubble flattening assembly includes a first pressing roller and a second pressing roller, and a channel is left between the first pressing roller and the second pressing roller, and the channel is used for the film bubble to pass through to form the film sheet.

[0010] In some embodiments of the present application, the film bubble flattening assembly further includes a first support plate and a second support plate, wherein the first support plate and the second support plate are respectively disposed at two ends of the first pressing roller and the second pressing roller;

[0011] The first pressing roller is rotatably connected to both the first supporting plate and the second supporting plate, and the second pressing roller is rotatably connected to both the first supporting plate and the second supporting plate.

[0012] In some embodiments of the present application, the first pressure roller is a chrome-plated steel roller, and the second pressure roller is a rubber roller.

[0013] In some embodiments of the present application, the diaphragm width measurement component includes:

[0014] A light source plate is arranged on one side of the membrane and is attached to the membrane, and the width of the light source plate is greater than the width of the membrane;

[0015] A camera, arranged on the other side of the diaphragm and corresponding to the light source board, for collecting a projection formed by the diaphragm on the light source board;

[0016] A width measuring device is electrically connected to the camera and is used to measure the width of the projection captured by the camera.

[0017] In some embodiments of the present application, the device further includes a heat preservation component disposed outside the screw sleeve of the film blowing machine.

[0018] In some embodiments of the present application, the insulation component includes an insulation pipe, and heat transfer oil is arranged in the insulation pipe.

[0019] In some embodiments of the present application, the apparatus further includes a control device, and the control device is electrically connected to both the diaphragm width measurement component and the exhaust component.

[0020] The technical solution provided by the present application may include the following beneficial effects: the present application can support the membrane bubble through the bubble stabilizing component, and by reducing the jitter of the membrane bubble, the bubble shape and position of the membrane bubble are kept stable to facilitate subsequent work; the membrane bubble is flattened by the membrane bubble flattening component to form a membrane sheet to facilitate the subsequent measurement of the membrane sheet diameter; the membrane sheet width is measured by the membrane sheet width measuring component, and according to the measurement data, the exhaust component discharges excess gas to adjust the amount of gas entering the membrane bubble, thereby achieving precise control of the membrane bubble diameter and further controlling the shrinkage rate of the product.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 It is a schematic structural diagram of a device for controlling the diameter of a membrane bubble according to an exemplary embodiment.

[0024] Reference numerals

[0025] 1. Film bubble stabilizing mechanism; 11. Film bubble stabilizing assembly; 111. Guide roller; 112. Bracket; 12. Film bubble flattening assembly; 121. First pressing roller; 122. Second pressing roller; 123. Channel; 124. First support plate; 125. Second support plate; 2. Film bubble diameter adjusting mechanism; 21. Film sheet width measuring assembly; 211. Light source board; 212. Camera; 213. Width measuring device; 22. Exhaust assembly; 3. Traction mechanism; 4. Film blowing machine; 5. Film bubble; 6. Film sheet. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other.

[0027] Since polyvinyl chloride has poor thermal stability, it begins to decompose hydrogen chloride gas when the heating temperature exceeds 150°C, and the plasticizing temperature of polyvinyl chloride is greater than 170°C. Therefore, when polyvinyl chloride is plasticized and blown into film, the gas produced by its own decomposition will work together with the compressed air to inflate the thin-walled tube, causing the amount of gas in the film bubble to exceed the predetermined amount, resulting in a change in the volume of the film bubble. In addition, because the amount of gas generated by polyvinyl chloride during the heating process is difficult to control, the amount of gas entering the film bubble is difficult to accurately control, resulting in unstable changes in the volume of the film bubble.

[0028] Based on this, the present application provides a device for controlling the diameter of a membrane bubble, including a membrane bubble stabilizing mechanism and a membrane bubble diameter adjusting mechanism, the membrane bubble stabilizing mechanism including a bubble stabilizing component and a membrane bubble flattening component, the membrane bubble diameter adjusting mechanism including a membrane sheet width measuring component and an exhaust component; the membrane bubble can be supported by the bubble stabilizing component to reduce the jitter of the membrane bubble; the membrane bubble is flattened by the membrane bubble flattening component to form a membrane sheet, so as to facilitate the subsequent measurement of the membrane sheet diameter; the width of the membrane sheet is measured by the membrane sheet width measuring component, and according to the measurement data, the exhaust component discharges excess gas to adjust the amount of gas entering the membrane bubble, thereby achieving precise control of the membrane bubble diameter and further controlling the shrinkage rate of the product.

[0029] Some specific implementation modes described below are intended to facilitate those skilled in the art to understand the present embodiment, and the present embodiment is not limited to some specific implementation modes described below.

[0030] like Figure 1 As shown, an exemplary embodiment of the present application provides a device for controlling the diameter of a film bubble, including a film bubble stabilizing mechanism 1 and a film bubble diameter adjusting mechanism 2; the film bubble stabilizing mechanism 1 includes a film bubble stabilizing component 11 and a film bubble flattening component 12, the film bubble stabilizing component 11 is arranged at the outlet end of the film blowing machine 4 and is used to support the film bubble 5, and the film bubble flattening component 12 is arranged on the side of the film stabilizing component 11 away from the outlet end of the film blowing machine 4, and is used to flatten the film bubble 5 to form a film sheet 6; the film bubble diameter adjusting mechanism 2 includes a film sheet width measuring component 21 and an exhaust component 22, the film sheet width measuring component 21 is used to measure the width of the film sheet 6, and the exhaust component 22 is arranged at the outlet end of the film blowing machine 4 and is used to exhaust part of the gas that will enter the film bubble 5. Among them, the exhaust component 22 can adopt a manual valve, and the exhaust is operated by the operator; it can also adopt an electromagnetic valve, and the exhaust is automatically controlled by the circuit.

[0031] In this embodiment, the bubble 5 can be supported by the bubble stabilizing component 11 to reduce the shaking of the bubble 5; the bubble 5 is flattened by the bubble flattening component 12 to form a diaphragm 6, so as to facilitate the subsequent measurement of the diameter of the diaphragm 6; the width of the diaphragm 6 is measured by the diaphragm width measuring component 21, and according to the measurement data, the exhaust component 22 discharges excess gas to adjust the amount of gas entering the bubble 5, thereby achieving precise control of the diameter of the bubble 5 and further controlling the shrinkage rate of the product.

[0032] The device for controlling the diameter of the film bubble of this embodiment may further include a support frame (not shown) and a traction mechanism 3, wherein the film bubble stabilizing mechanism 1, the film bubble diameter adjusting mechanism 2 and the traction mechanism 3 are arranged on the support frame, and the support frame supports the film bubble stabilizing mechanism 1, the film bubble diameter adjusting mechanism 2 and the traction mechanism 3. After the film bubble 5 is formed into a film sheet 6 by the film bubble flattening assembly 12, it can be pulled by the traction mechanism 3.

[0033] In one embodiment, the bubble stabilizing component 11 includes two opposing supporting components, and the distance between the two supporting components gradually decreases along the direction approaching the membrane bubble flattening component 12 .

[0034] In this embodiment, the bubble stabilizing component 11 is located above the film blowing machine 4 and below the film bubble flattening component 12; the bubble stabilizing component 11 can support the film bubble 5 through two opposing supporting components to reduce the shaking of the film bubble 5. In the direction close to the film bubble flattening component 12, the distance between the two supporting components gradually decreases, so that the bubble stabilizing component 11 can adapt to film bubbles 5 of different volumes, so as to play a good supporting role for film bubbles 5 of different volumes.

[0035] In one embodiment, the supporting component includes a plurality of guide rollers 111 and a bracket 112 for supporting the plurality of guide rollers 111 , and the plurality of guide rollers 111 are arranged at intervals along the outlet end of the film blowing machine 4 toward the film bubble flattening assembly 12 .

[0036] In this embodiment, by providing a plurality of guide rollers 111, the film bubble 5 can be easily transferred to the film bubble flattening assembly 12. The bracket 112 supports the guide roller 111, and the bracket 112 can be fixed on the support frame. In order to increase the service life of the guide roller 111, the guide roller 111 can be made of stainless steel, and the guide roller 111 and the bracket 112 can be fixed by screws.

[0037] In one embodiment, the film bubble flattening assembly 12 includes a first pressing roller 121 and a second pressing roller 122 , and a channel 123 is left between the first pressing roller 121 and the second pressing roller 122 , and the channel 123 is used for the film bubble 5 to pass through to form a film sheet 6 .

[0038] In this embodiment, the bubble stabilizing component 11 supports the film bubble 5, and then the film bubble 5 passes through the gap between the two supporting components and moves to the channel 123 between the first pressing roller 121 and the second pressing roller 122. Under the pressure of the first pressing roller 121 and the second pressing roller 122, the gas of the film bubble 5 is squeezed out to form a membrane sheet 6.

[0039] In one embodiment, the bubble flattening assembly 12 also includes a first support plate 124 and a second support plate 125, which are respectively arranged at the two ends of the first pressure roller 121 and the second pressure roller 122; the first pressure roller 121 is rotatably connected to the first support plate 124 and the second support plate 125, and the second pressure roller 122 is rotatably connected to the first support plate 124 and the second support plate 125.

[0040] In this embodiment, the first support plate 124 and the second support plate 125 can support the first pressure roller 121 and the second pressure roller 122 , and the first support plate 124 and the second support plate 125 can be fixed on the support frame.

[0041] Among them, bearing seats can be installed at both ends of the first pressure roller 121 and the second pressure roller 122, and the bearing seats are fixed to the first support plate 124 and the second support plate 125 by screws; the first pressure roller 121 and the second pressure roller 122 are rotatably connected to the first support plate 124 and the second support plate 125 through the bearing seats, which can reduce the wear of the first pressure roller 121 and the second pressure roller 122 to increase their service life.

[0042] In one embodiment, the first pressing roller 121 is a chrome-plated steel roller, and the second pressing roller 122 is a rubber roller.

[0043] In this embodiment, the first pressure roller 121 adopts a chrome-plated steel roller to provide the required extrusion hardness so that it has a long service life. The second pressure roller 122 adopts a rubber roller to provide elastic extrusion. Through the cooperation of the chrome-plated steel roller and the rubber roller, the membrane bubble 5 can be squeezed to form a membrane sheet 6 without causing damage to the surface of the membrane bubble 5.

[0044] In one embodiment, the diaphragm width measuring component 21 includes a light source board 211, a camera 212 and a width measuring device 213. The light source board 211 is arranged on one side of the diaphragm 6 and is in contact with the diaphragm 6. The width of the light source board 211 is greater than the width of the diaphragm 6. The camera 212 is arranged on the other side of the diaphragm 6 and corresponds to the light source board 211, and is used to collect the projection formed by the diaphragm 6 on the light source board 211. The width measuring device 213 is electrically connected to the camera 212, and is used to measure the width of the projection collected by the camera 212.

[0045] In this embodiment, the light source plate 211 can be set below the diaphragm 6 and close to the surface of the diaphragm 6, and the camera 212 is set above the diaphragm 6. When the diaphragm 6 passes through the diaphragm width measuring component 21, the projection of the diaphragm 6 on the light source plate 211 is collected by the camera 212 and uploaded to the width measuring device 213. The width measuring device 213 can analyze and process the image collected by the camera 212; when the width measuring device 213 analyzes that the diameter of the membrane bubble (that is, the diaphragm width) is too large, the excess gas is discharged through the exhaust component 22.

[0046] In one embodiment, the device further comprises a heat preservation component (not shown in the figure) arranged outside the screw sleeve of the film blowing machine 4 .

[0047] Since polyvinyl chloride resin has relatively poor thermal stability, it is more likely to decompose and release gas when the heating temperature fluctuates. In addition, the heat released by the resin raw material during the extrusion process and its own excessive heating can easily cause overheating. Therefore, in this embodiment, a heat preservation component is provided outside the screw sleeve of the film blowing machine 4 to reduce the temperature fluctuation of the screw to maintain the stability of the polyvinyl chloride heating.

[0048] In one embodiment, the thermal insulation component includes a thermal insulation pipe, and heat transfer oil is arranged in the thermal insulation pipe.

[0049] In this embodiment, the insulation component can be configured as an insulation tube, which can be arranged around the outside of the screw sleeve to insulate the screw. Heat transfer oil is arranged in the insulation tube, which has a better insulation effect and a small temperature fluctuation, and can play a better role in reducing the temperature fluctuation of the screw.

[0050] In one embodiment, the device includes a bubble stabilizing mechanism 1, a bubble diameter adjusting mechanism 2 and a control device, wherein the bubble stabilizing mechanism 1 includes a bubble stabilizing component 11 and a bubble flattening component 12, and the bubble diameter adjusting mechanism 2 includes a diaphragm width measuring component 21 and an exhaust component 22, and the control device is electrically connected to the diaphragm width measuring component 21 and the exhaust component 22. Among them, the structures of the bubble stabilizing mechanism 1 and the bubble diameter adjusting mechanism 2 are the same as those in the above embodiment, and will not be repeated here.

[0051] In this embodiment, after the film bubble 5 is blown out by the film blowing machine 4, it is supported by the bubble stabilizing component 11, and then the film bubble 5 is flattened by the film bubble flattening component 12 to form a film sheet 6. When the film sheet 6 passes through the film sheet width measuring component 21, the projection formed by the film sheet 6 on the light source board 211 is collected by the camera 212 and uploaded to the width measuring device 213. The width measuring device 213 can analyze and process the image collected by the camera 212; when the width measuring device 213 analyzes that the film bubble diameter (that is, the film sheet width) is too large, the control device controls the solenoid valve of the exhaust component 22 to automatically open the exhaust. After the excess gas is discharged, the solenoid valve of the exhaust component 22 is automatically closed to complete the precise control of the film bubble diameter.

[0052] In summary, the bubble diameter adjustment mechanism 2 of the present application can adjust the amount of gas that will enter the bubble 5 in real time to accurately control the diameter of the bubble 5, thereby controlling the shrinkage rate of the product to improve product quality.

[0053] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and embodiments are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims of the present application.

[0054] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A device for controlling the diameter of a film bubble, characterized in that: include: A film bubble stabilizing mechanism, the film bubble stabilizing mechanism comprising a film bubble stabilizing component and a film bubble flattening component, the film bubble stabilizing component is arranged at the outlet end of the film blowing machine and is used to support the film bubble, the film bubble flattening component is arranged on the side of the film stabilizing component away from the outlet end of the film blowing machine, and is used to flatten the film bubble to form a film sheet; The film bubble diameter adjustment mechanism comprises a film width measuring component and an exhaust component. The film width measuring component is used to measure the width of the film. The exhaust component is arranged at the outlet end of the film blowing machine and is used to exhaust part of the gas that is about to enter the film bubble.

2. The device for controlling the diameter of a film bubble according to claim 1, characterized in that: The bubble stabilizing component includes two opposing supporting parts, and the distance between the two supporting parts gradually decreases along the direction approaching the membrane bubble flattening component.

3. The device for controlling the diameter of a film bubble according to claim 2, characterized in that: The supporting component comprises a plurality of guide rollers and a bracket for supporting the plurality of guide rollers, and the plurality of guide rollers are arranged at intervals along the outlet end of the film blowing machine toward the film bubble flattening assembly.

4. The device for controlling the diameter of a film bubble according to claim 1, characterized in that: The film bubble flattening assembly includes a first pressing roller and a second pressing roller, wherein a channel is left between the first pressing roller and the second pressing roller, and the channel is used for the film bubble to pass through to form the film sheet.

5. The device for controlling the diameter of a film bubble according to claim 4, characterized in that: The film bubble flattening assembly further comprises a first support plate and a second support plate, wherein the first support plate and the second support plate are respectively arranged at two ends of the first pressing roller and the second pressing roller; The first pressing roller is rotatably connected to both the first supporting plate and the second supporting plate, and the second pressing roller is rotatably connected to both the first supporting plate and the second supporting plate.

6. The device for controlling the diameter of a film bubble according to claim 4, characterized in that: The first pressing roller is a chrome-plated steel roller, and the second pressing roller is a rubber roller.

7. The device for controlling the diameter of a film bubble according to claim 1, characterized in that: The diaphragm width measuring assembly comprises: A light source plate is arranged on one side of the membrane and is attached to the membrane, and the width of the light source plate is greater than the width of the membrane; A camera, arranged on the other side of the membrane and corresponding to the light source board, for collecting a projection formed by the membrane on the light source board; A width measuring device is electrically connected to the camera and is used to measure the width of the projection captured by the camera.

8. The device for controlling the diameter of a film bubble according to claim 1, characterized in that: The device also includes a heat preservation component arranged outside the screw sleeve of the film blowing machine.

9. The device for controlling the diameter of a film bubble according to claim 8, characterized in that: The heat preservation component comprises a heat preservation pipe, and heat transfer oil is arranged in the heat preservation pipe.

10. The device for controlling the diameter of a film bubble according to claim 1, characterized in that: The device also includes a control device, which is electrically connected to the diaphragm width measurement component and the exhaust component.

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