Forming method and extrusion device of tight seam rubber for elastic air bag

Abstract

The invention discloses a forming method and an extrusion device of tight seam rubber for an elastic air bag, and the forming method comprises the following steps: S1, starting an extruder, injecting a heated and melted rubber stock solution into a screw rod through a discharge hole of the extruder, and then injecting the rubber stock solution into the extrusion device through a discharge end of the screw rod; s2, the rubber stock solution injected into the extrusion device is subjected to injection molding through the extrusion device to form a round rubber tube rubber skin, then the round rubber tube rubber skin formed through injection molding is cut off through a blade, finally, the cut round rubber tube rubber skin is subjected to solidification forming, and the tight seam rubber skin is obtained. According to the forming method and the extrusion device, one set of extrusion device is additionally arranged on an existing extruder, one-time injection molding of the tight seam rubber can be achieved, the machining efficiency is greatly improved, the product quality is improved, the forming method and the extrusion device are applied to the oil tank, and the use requirement of the oil tank can be met; and the configured extrusion device is simple in overall structure, convenient to operate and use and suitable for popularization and application.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to a molding method and an extrusion device of a tight-seam rubber for an elastic air bag. Background Art

[0002] An injection mold is a tool for producing plastic products. It is also a tool that gives plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. It mainly achieves the processing of the shape of the object by changing the physical state of the molded material. It is known as the "mother of industry". Specifically, it refers to the high-pressure injection of heated and melted plastic into the mold cavity by an injection molding machine, and after cooling and solidification, a molded product is obtained.

[0003] At present, a large number of elastic bag fuel tanks are used in the fuel systems of aviation, ships or other vehicles. When processing elastic bag fuel tanks, strict seam rubber is required. The strict seam rubber is used at the elastic bag seams of the elastic bag fuel tank to enhance the tensile strength of the bag body and the sealing of the bag body. How to process qualified strict seam rubber is an important component to meet the use of fuel tanks. At present, the injection molding method of strict seam rubber is to repeatedly roll it into a large piece of film with the required thickness on an open rubber mixing machine, and then use manual marking and cutting to produce strict seam rubber of the required length and width. Using the existing processing method, the size of the strict seam rubber cut out by processing, marking and cutting not only has problems such as large errors, poor surface roughness, wrinkles and bubbles on the surface, but also is time-consuming and labor-intensive, and has low processing efficiency.

[0004] After searching, the patent document with the authorization announcement number CN220129415U discloses an injection mold for automobile top rubber parts, and the patent document with the application publication number CN102128263A discloses a fully enclosed rubber-coated sponge rubber sealing strip and its continuous extrusion vulcanization molding method. From the contents disclosed in the two retrieved patent documents, an injection mold and a molding method that meet the use requirements are provided from different angles. In view of the problems existing in the existing injection molding of tight-seam rubber, in order to meet the use requirements of the fuel tank, the existing extruder is used to provide an extrusion device different from the prior art. By adding a set of extrusion devices to cooperate with the existing extruder, the injection molding of tight-seam rubber can be realized, so that the processed product can meet the use requirements of the fuel tank. Summary of the invention

[0005] The technical problem to be solved by the present invention is to address the problems existing in the background technology, thereby providing an extrusion device with a simple structure and easy operation. The extrusion device is used in conjunction with an extruder to achieve injection molding of a tight-seam rubber, so as to improve product quality and meet the use requirements of the fuel tank. Specifically, it is a molding method and extrusion device for a tight-seam rubber for an elastic air bag.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a molding method of a tight-seam rubber for an elastic air bag, the molding method comprising the following steps: S1. Start the extruder, and inject the heated and melted rubber stock solution into the screw through the discharge hole of the extruder, and then inject it into the extrusion device through the discharge end of the screw; S2. The rubber stock liquid injected into the extrusion device passes through the guide sleeve, the punch connection block, the limit screw sleeve and the fixed screw sleeve in the extrusion device in sequence, and then is injection-molded by the tube punch in the extrusion device to form a round hose rubber skin. Then, the thickness of the round hose rubber skin formed by injection molding is adjusted by the tube die installed in the fixed screw sleeve, and then the round hose rubber skin formed by injection molding is cut off by a blade installed at the end of the tube punch. Finally, the cut round hose rubber skin is solidified to obtain a tight-seam rubber skin.

[0007] Furthermore, using the molding method described in the present invention, during the extrusion process in step S2, the method for adjusting the thickness of the rubber skin of the round hose formed by injection molding is to screw the fixed screw sleeve installed in the limiting screw sleeve inward in the direction of the guide sleeve, so that the gap between the tube die and the tube punch becomes smaller, and the tube die is used to squeeze the rubber stock liquid flowing out along the tube punch, thereby reducing the thickness of the rubber skin of the round hose; conversely, by screwing the fixed screw sleeve outward away from the guide sleeve, the gap between the tube die and the tube punch becomes larger, and the tube die is used to squeeze the rubber stock liquid flowing out along the tube punch, thereby increasing the thickness of the rubber skin of the round hose.

[0008] The present invention also discloses an extrusion device for the molding method of the tight-seam rubber for the elastic air bag, the extrusion device includes a blade, a fixed screw sleeve, a limiting screw sleeve, a tube die, a tube punch, a punch connecting block and a guide sleeve, the fixed screw sleeve, the limiting screw sleeve and the guide sleeve all have an axial through hole, and the punch connecting block has an injection channel, the limiting screw sleeve and the guide sleeve are connected by the punch connecting block, and the axial through hole between the limiting screw sleeve and the guide sleeve is communicated with the injection channel in the punch connecting block; the fixed screw sleeve is connected to the limiting screw sleeve by a threaded connection, the tube die is arranged in the axial through hole in the fixed screw sleeve, and the tube punch is connected to the punch connecting block through the axial through hole in the fixed screw sleeve, a gap is formed between the tube die and the tube punch for the rubber stock to flow out, and the blade is installed on the tube punch close to the side of the tube die.

[0009] Furthermore, using the extrusion device described in the present invention, an internal thread is provided in the axial through hole of the limiting screw sleeve, and an external thread matching the internal thread in the limiting screw sleeve is provided on the outer side of the fixing screw sleeve, and the fixing screw sleeve is threadedly connected to the limiting screw sleeve.

[0010] Furthermore, using the extrusion device described in the present invention, the fixed screw sleeve includes a cover and a plugging portion and a screw connection portion, the fixed screw sleeve forms a T-shaped boss-shaped cavity structure through the cover and the screw connection portion, the external thread in the fixed screw sleeve is arranged on the outer side surface of the screw connection portion, and the fixed screw sleeve is screwed with the axial through hole in the limit screw sleeve through the screw connection portion.

[0011] Furthermore, using the extrusion device described in the present invention, the axial through hole in the fixed screw sleeve includes a coaxially arranged mounting hole and a discharge hole, the mounting hole and the discharge hole constitute a stepped hole structure, and the aperture of the discharge hole is smaller than the aperture of the mounting hole, wherein the discharge hole is located at the center of the cover plugging portion, and the mounting hole passes through the center of the screw connecting portion along the axial direction of the screw connecting portion and communicates with the discharge hole; the tube die is annularly fixed in the mounting hole close to one side of the discharge hole, and the tube punch is connected to the punch connecting block after passing through the discharge hole and the mounting hole.

[0012] Furthermore, using the extrusion device described in the present invention, the tube die is set as a cylindrical structure, and an extrusion channel is provided at the center along its axial direction. The tube die forms a gap for the rubber stock solution to flow out through the extrusion channel and the outer side surface of the tube punch; the blade is installed on the tube punch close to the side of the extrusion channel.

[0013] Furthermore, using the extrusion device described in the present invention, the extrusion channel includes an extrusion guide hole and an extrusion through hole, the extrusion guide hole is arranged in a conical through hole structure, and the extrusion through hole is arranged in a circular hole structure, the tube die forms a gap for the rubber stock solution to flow out through the extrusion through hole and the outer side surface of the tube punch, and the blade is installed on the tube punch close to the side of the extrusion through hole; the relationship between the aperture d of the extrusion through hole and the width b of the tight seam rubber to be extruded is, d=b / 3.14.

[0014] Furthermore, using the extrusion device described in the present invention, the tube punch is configured as a conical structure, a semi-circular arc transition structure is provided at the front end of the tube punch, and a connecting portion is provided at the rear end thereof, and the tube punch is connected to the punch connecting block via the connecting portion; and a card groove corresponding to the blade is provided on the side surface of the tube punch close to its front end, and the blade is detachably mounted on the tube punch via the card groove.

[0015] Furthermore, the extrusion device described in the present invention is adopted, and the punch connecting block includes a screw block and a punch body, the screw block is configured as a T-shaped boss-shaped cavity structure, the outer structure of the punch body matches the tube punch, the punch body is located inside the screw block, and its front end extends to the outside of the screw block; there are multiple injection channels in the punch connecting block, and the multiple injection channels are arranged in a ring state in the screw block outside the punch body, and a screw blind hole corresponding to the connecting part in the tube punch is provided at the rear end of the punch body, and the tube punch is screwed in the screw blind hole through the connecting part, so as to realize a detachable connection between the tube punch and the punch connecting block.

[0016] The molding method and extrusion device of the elastic airbag bag with a tight seam rubber described in the present invention, compared with the prior art, has the following beneficial effects: using the existing rubber extruder, inserting the guide sleeve in the extrusion device into the mounting hole of the discharge end of the extruder, configuring the extrusion device to cooperate with the extruder, during injection molding, only the rubber material required for the tight seam rubber needs to be put into the rubber extruder each time, the extrusion device is installed on the rubber extruder, the extruder is started, and the tight seam rubber of the required width size can be extruded through the cooperation of the tube concave mold and the tube convex mold, and the thickness size of the extruded tight seam rubber is uniform, the width size of the tight seam rubber is consistent, the surface roughness is high, and the surface has no wrinkles and bubbles. In subsequent use, it only needs to be cut according to the length size of the tight seam rubber, and then installed in the fuel tank, so as to meet the use requirements of the fuel tank, and is particularly suitable for the processing of the tight seam rubber required for the elastic bag tank in the fuel system of aviation, ships or other vehicles, and has the advantages of simple operation, time and labor saving, fast processing speed, and good quality of the processed tight seam rubber film.

[0017] It can be seen that by adopting the molding method and extrusion device described in the present invention, by adding a set of extrusion device to the existing extruder, one-time injection molding of tight-seam rubber can be achieved, which not only greatly improves the processing efficiency, but also improves the product quality. Applying it to the oil tank can meet the use requirements of the oil tank. The configured extrusion device has a simple overall structure, is easy to operate and use, and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structure of the extrusion device of the present invention; Figure 2 It is a structural schematic diagram of the fixing screw sleeve described in the present invention; Figure 3 It is a structural schematic diagram of the tube concave mold described in the present invention; Figure 4 It is a structural schematic diagram of the male die connecting block described in the present invention; Figure 5 It is a schematic diagram of the structure of the extrusion device of the present invention in the installed state; Figure 6 This is a schematic diagram of the structure of the tight seam rubber in the extrusion state of the present invention; Figure 7 It is a schematic diagram of the structure of the tight seam rubber in the present invention when it is cut open along the blade edge.

[0020] As shown in the figure: 1-blade, 2-fixing screw sleeve, 21-cover plugging part, 22-screw connection part, 23-mounting hole, 24-discharge hole, 3-limiting screw sleeve, 4-tube die, 41-extrusion guide hole, 42-extrusion through hole, 5-tube punch, 6-punch connecting block, 61-screw connection block, 62-punch body, 7-guide sleeve, 8-tight seam rubber. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the description of the orientation involved in this specification, such as the terms "upper", "lower", "left", "right", etc., are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship, without substantial change in the technical content, should also be regarded as the scope of the implementation of the present invention. Its purpose is only to facilitate the description of the present invention and simplify the description, and it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. Example 1

[0025] like Figures 1 to 4 As shown, an extrusion device for a molding method of a tight-seam rubber for an elastic air bag provided by the present embodiment is used, the extrusion device includes a blade 1, a fixed screw sleeve 2, a limiting screw sleeve 3, a tube die 4, a tube punch 5, a punch connection block 6 and a guide sleeve 7, the fixed screw sleeve 2, the limiting screw sleeve 3 and the guide sleeve 7 all have an axial through hole, and the punch connection block 6 has an injection channel, the limiting screw sleeve 3 and the guide sleeve 7 are connected by the punch connection block 6, and the axial through hole between the limiting screw sleeve 3 and the guide sleeve 7 is communicated through the injection channel in the punch connection block 6; the fixed screw sleeve 2 is connected to the limiting screw sleeve 3 by a screw connection, the tube die 4 is arranged in the axial through hole in the fixed screw sleeve 2, and the tube punch 5 is connected to the punch connection block 6 through the axial through hole in the fixed screw sleeve 2, a gap for the rubber stock solution to flow out is formed between the tube die 4 and the tube punch 5, and the blade 1 is installed on the tube punch 5 close to the tube die 4 side.

[0026] Furthermore, using the extrusion device described in this embodiment, in the specific manufacturing process, an internal thread is provided in the axial through hole of the limiting screw sleeve 3, and an external thread matching the internal thread in the limiting screw sleeve 3 is provided on the outer side of the fixed screw sleeve 2, and the fixed screw sleeve 2 is screwed into the limiting screw sleeve 3 by threading. At the same time, the fixed screw sleeve 2 includes a cover and plug part 21 and a screw connection part 22, and the fixed screw sleeve 2 forms a T-shaped boss-shaped cavity structure through the cover and plug part 21 and the screw connection part 22, and the external thread in the fixed screw sleeve 2 is arranged on the outer side of the screw connection part 22, and the fixed screw sleeve 2 is screwed with the axial through hole in the limiting screw sleeve 3 through the screw connection part 22. The fixed screw sleeve 2 and the limiting screw sleeve 3 are arranged in a screw connection mode, so as to facilitate the adjustment of the depth of the fixed screw sleeve 2 screwed into the limiting screw sleeve 3.

[0027] Furthermore, the extrusion device described in this embodiment is adopted, and the axial through hole in the fixed screw sleeve 2 includes a coaxially arranged mounting hole 23 and a discharge hole 24, and the mounting hole 23 and the discharge hole 24 constitute a stepped hole structure, and the aperture of the discharge hole 24 is smaller than the aperture of the mounting hole 23, wherein the discharge hole 24 is located at the center of the cover plugging portion 21, and the mounting hole 23 passes through the center of the screw connecting portion 22 along the axial direction of the screw connecting portion 22 and communicates with the discharge hole 24; the tube die 4 is annularly fixed in the mounting hole 23 close to the side of the discharge hole 24, and the tube punch 5 passes through the discharge hole 24 and the mounting hole 23, and is connected to the punch connecting block 6.

[0028] Furthermore, the extrusion device described in this embodiment is adopted, the tube die 4 is set as a cylindrical structure, and an extrusion channel is provided at the center along its axial direction, and the tube die 4 forms a gap for the rubber stock solution to flow out through the extrusion channel and the outer side surface of the tube punch 5; the blade 1 is installed on the tube punch 5 close to the side of the extrusion channel; and the tube punch 5 is set as a conical structure, a semi-circular arc transition structure is provided at the front end of the tube punch 5, and a connecting part is provided at the rear end, and the tube punch 5 is connected to the punch connecting block 6 through the connecting part; and a groove corresponding to the blade 1 is provided on the side of the tube punch 5 close to its front end, and the blade 1 is detachably mounted on the tube punch 5 through the groove.

[0029] Furthermore, the extrusion device described in this embodiment is adopted, and the punch connecting block 6 includes a screw block 61 and a punch body 62, the screw block 61 is set as a T-shaped boss-shaped cavity structure, and the outer structure of the punch body 62 matches the tube punch 5, and the punch body 62 is located inside the screw block 61, and its front end extends to the outside of the screw block 61; there are multiple injection channels in the punch connecting block 6, and the multiple injection channels are arranged in a ring state in the screw block 61 outside the punch body 62, and a screw blind hole corresponding to the connecting part in the tube punch 5 is provided at the rear end of the punch body 62, and the tube punch 5 is screwed in the screw blind hole through the connecting part, so as to realize the detachable connection between the tube punch 5 and the punch connecting block 6. During the specific production process, in order to achieve a tight connection between the tube punch 5 and the punch connecting block 6, a limiting portion that can be clamped together is provided between the tube punch 5 and the punch connecting block 6, and the front end of the punch connecting block 6 is inserted into the rear end face of the punch connecting block 6, so that a sealed connection effect can be achieved.

[0030] Furthermore, the extrusion device described in this embodiment is adopted, and the extrusion channel includes an extrusion guide hole 41 and an extrusion through hole 42, the extrusion guide hole 41 is arranged as a conical through hole structure, and the extrusion through hole 42 is arranged as a circular hole structure, and the tube die 4 forms a gap for the rubber stock solution to flow out through the extrusion through hole 42 and the outer side surface of the tube punch 5, and the blade 1 is installed on the tube punch 5 close to the side of the extrusion through hole 42. In the specific production process, when designing the tube die 3, since the circumference of the hole size of the extrusion through hole 42 in the tube die 3 is the width size of the tight seam rubber 8, the aperture d of the extrusion through hole 42 is the width b of the tight seam rubber 8 ÷ 3.14. For example, if the width size of the tight seam rubber 8 is 40 mm, the hole diameter of the injection hole 42 in the tube die 3 is 40 ÷ 3.14 = 12.74 mm. The conversion formula is: the diameter of the extrusion through hole d = the width b of the tight seam rubber 8 ÷ 3.14. Example 2

[0031] like Figures 5 to 7 As shown, this embodiment provides a method for forming a tight-seam rubber for an elastic airbag bag, and the forming method comprises the following steps: S1. Start the extruder, and inject the heated and melted rubber stock solution into the screw through the discharge hole of the extruder, and then inject it into the extrusion device through the discharge end of the screw; S2. The rubber stock liquid injected into the extrusion device passes through the guide sleeve 7, the male die connecting block 6, the limiting screw sleeve 3 and the fixed screw sleeve 2 in the extrusion device in turn, and is then injection-molded into a round hose rubber skin using the tube male die 5 in the extrusion device. Then, the thickness of the round hose rubber skin formed by injection molding is adjusted by the tube female die 4 installed in the fixed screw sleeve 2, and then the round hose rubber skin formed by injection molding is cut off by the blade 1 installed at the end of the tube male die 5. Finally, the cut round hose rubber skin is solidified to obtain a tight-seam rubber product.

[0032] Furthermore, using the molding method described in this embodiment, during the extrusion process in step S2, the method for adjusting the thickness of the rubber skin of the round hose formed by injection molding is to screw the fixed screw sleeve 2 installed in the limiting screw sleeve 3 inwardly in the direction of the guide sleeve 7, so that the gap between the tube die 4 and the tube punch 5 becomes smaller, and the tube die 4 is used to squeeze the rubber stock solution flowing out along the tube punch 5, thereby reducing the thickness of the rubber skin of the round hose; conversely, by screwing the fixed screw sleeve 2 outwardly away from the guide sleeve 7, the gap between the tube die 4 and the tube punch 5 becomes larger, and the tube die 4 is used to squeeze the rubber stock solution flowing out along the tube punch 5, thereby increasing the thickness of the rubber skin of the round hose.

[0033] The molding method described in the present invention completely changes the existing manufacturing method of the tight-seam rubber. By adding a set of extrusion devices to the existing rubber extruder, the manufacturing and processing of the tight-seam rubber, that is, integrated injection molding, is realized. Its working principle is: the guide sleeve 7 is installed in the innermost mounting hole of the extruder discharge end in advance, the pipe punch 5 is screwed into the screw hole of the punch connecting block 6, and the combination formed by connecting the pipe punch 5 and the punch connecting block 6 is installed together into the axial through hole of the limiting screw sleeve 3, and then the combination of the pipe punch 5, the punch connecting block 6 and the limiting screw sleeve 3 is installed together into the end screw hole of the extruder discharge end, and connected and fixed by the threaded hole of the extruder discharge end and the thread of the limiting sleeve 3, the pipe die 4 is installed in the fixed screw sleeve 2, and then the combination of the pipe die 4 and the fixed screw sleeve 2 is installed together into the axial through hole of the limiting screw sleeve 3, and connected and fixed by the internal thread of the limiting screw sleeve 3 and the external thread of the fixed screw sleeve 2. Since the limiting screw sleeve 3 and the fixed screw sleeve 2 are connected by screw connection, the wall thickness of the rubber skin of the extruded round hose is adjusted by the screwing distance of the fixed screw sleeve 2. The more the fixed screw sleeve 2 is screwed in, the smaller the wall thickness of the round hose is, and vice versa. Since the blade 1 is clamped into the groove of the conical end of the tube punch 5, and the upper end of the blade 1 is in contact with the end of the tube die 4, it can be ensured that the extruded round hose rubber skin is strictly disconnected at the blade 1 to form a qualified tight seam rubber skin 8. The required type of rubber is loaded into the extruder, and the extruder is started, and the tight seam rubber skin 8 of the required width size can be extruded. When using it, it only needs to be cut according to the required length of the tight seam rubber skin 8.

[0034] It can be seen that the molding method of the present invention is used, compared with the manufacturing method of the existing tight seam rubber 8, its advantage is that each time, only the rubber material required for the tight seam rubber 8 needs to be put into the rubber extruder, the extrusion device is installed on the rubber extruder, and the machine is started, and the tight seam rubber 8 of the required width size can be extruded, and the thickness size of the extruded tight seam rubber 8 is uniform, the width size of the tight seam rubber 8 is good, the surface roughness is high, and there are no wrinkles and bubbles on the surface. When using, it is only necessary to cut it according to the length size of the required tight seam rubber 8. It is simple to operate, save time and labor, and the extrusion device has a simple and compact structure, few components, and each part is fixedly installed in the screw hole of the rubber extruder end, which is safe and reliable. The thickness and width size consistency of the tight seam rubber sheet processed by the molding method of the present invention are good, the surface roughness is high, and there are no wrinkles and bubbles on the surface. The tight seam rubber 8 processed by this method is applied to the fuel tank, which can improve the tensile strength of the elastic bag body and the air tightness of the bag body. The invention is particularly suitable for processing the tight seam rubber 8 required for the elastic bag oil tank in the manufacturing of the elastic bag oil tank in the fuel system of aviation, ships or other vehicles.

[0035] In summary, by adopting the molding method and extrusion device described in the present invention, by adding a set of extrusion device to the existing extruder, it is possible to achieve one-time injection molding of the tight-seam rubber 8, which not only greatly improves the processing efficiency, but also improves the product quality. Applying it to the oil tank can meet the use requirements of the oil tank. The configured extrusion device has a simple overall structure, is easy to operate and use, and is suitable for promotion and application.

[0036] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0037] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. The above description is only a preferred implementation method of the present invention and does not limit the present invention. Any minor modifications, equivalent substitutions and improvements made according to the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.

Claims

1. A method for forming a tight-seam rubber for an elastic airbag bag, characterized in that: The molding method comprises the following steps: S1. Start the extruder, and inject the heated and melted rubber stock solution into the screw through the discharge hole of the extruder, and then inject it into the extrusion device through the discharge end of the screw; S2. The rubber stock liquid injected into the extrusion device passes through the guide sleeve (7), the male die connecting block (6), the limiting screw sleeve (3) and the fixed screw sleeve (2) in the extrusion device in sequence, and then is injection-molded by the tube male die (5) in the extrusion device to form a round rubber hose skin. Then, the thickness of the round rubber hose skin formed by injection molding is adjusted by the tube female die (4) installed in the fixed screw sleeve (2). Then, the round rubber hose skin formed by injection molding is cut off by the blade (1) installed at the end of the tube male die (5). Finally, the cut round rubber hose skin is solidified to obtain a tight-seam rubber skin.

2. The method for forming a tight-seam rubber for an elastic air bag according to claim 1, characterized in that: During the extrusion process of step S2, the method for adjusting the thickness of the rubber skin of the round rubber hose formed by injection molding is to screw the fixing screw sleeve (2) installed in the limiting screw sleeve (3) inwardly in the direction of the guide sleeve (7), so that the gap between the tube die (4) and the tube punch (5) becomes smaller, and the tube die (4) is used to squeeze the rubber stock liquid flowing out along the tube punch (5), thereby reducing the thickness of the rubber skin of the round rubber hose; On the contrary, by rotating the fixing screw sleeve (2) outward away from the guide sleeve (7), the gap between the tube die (4) and the tube punch (5) becomes larger, and the tube die (4) is used to squeeze the rubber stock solution flowing out along the tube punch (5), thereby increasing the thickness of the rubber skin of the round rubber hose.

3. An extrusion device used in the molding method of a tight-seam rubber for an elastic air bag as claimed in claim 1 or 2, characterized in that: The extrusion device comprises a blade (1), a fixed screw sleeve (2), a limiting screw sleeve (3), a tube die (4), a tube punch (5), a punch connection block (6) and a guide sleeve (7); the fixed screw sleeve (2), the limiting screw sleeve (3) and the guide sleeve (7) all have axial through holes, and the punch connection block (6) has an injection channel; the limiting screw sleeve (3) and the guide sleeve (7) are connected via the punch connection block (6); the axial through hole between the limiting screw sleeve (3) and the guide sleeve (7) is connected via the punch connection block (6); The injection channels in the mold connecting block (6) are connected; the fixed screw sleeve (2) is connected to the limiting screw sleeve (3) by screw connection; the tube die (4) is arranged in the axial through hole in the fixed screw sleeve (2); the tube punch (5) passes through the axial through hole in the fixed screw sleeve (2) and is connected to the punch connecting block (6); a gap is formed between the tube die (4) and the tube punch (5) for the rubber stock solution to flow out; the blade (1) is installed on the tube punch (5) on the side close to the tube die (4).

4. The extrusion device according to claim 3, characterized in that: An internal thread is provided in the axial through hole of the limiting screw sleeve (3), and an external thread matching the internal thread in the limiting screw sleeve (3) is provided on the outer side surface of the fixing screw sleeve (2); the fixing screw sleeve (2) is screwed into the limiting screw sleeve (3) by means of threads.

5. The extrusion device according to claim 4, characterized in that: The fixed screw sleeve (2) comprises a cover and plugging portion (21) and a screw-connecting portion (22); the fixed screw sleeve (2) forms a T-shaped boss-shaped cavity structure through the cover and plugging portion (21) and the screw-connecting portion (22); the external thread in the fixed screw sleeve (2) is arranged on the outer side surface of the screw-connecting portion (22); the fixed screw sleeve (2) is screw-connected with the axial through hole in the limit screw sleeve (3) through the screw-connecting portion (22).

6. The extrusion device according to claim 5, characterized in that: The axial through hole in the fixed screw sleeve (2) includes a coaxially arranged mounting hole (23) and a discharge hole (24), wherein the mounting hole (23) and the discharge hole (24) form a stepped hole structure, and the hole diameter of the discharge hole (24) is smaller than the hole diameter of the mounting hole (23), wherein the discharge hole (24) is located at the center of the cover plug (21), and the mounting hole (23) passes through the center of the screw connection part (22) along the axial direction of the screw connection part (22) and communicates with the discharge hole (24); the tube die (4) is annularly fixed in the mounting hole (23) on one side close to the discharge hole (24), and the tube punch (5) passes through the discharge hole (24) and the mounting hole (23) and is connected to the punch connection block (6).

7. The extrusion device according to claim 6, characterized in that: The tube die (4) is configured as a cylindrical structure and is provided with an extrusion channel at the center along its axial direction. The tube die (4) forms a gap for the rubber stock solution to flow out through the extrusion channel and the outer side surface of the tube punch (5). The blade (1) is mounted on the tube punch (5) on the side close to the extrusion channel.

8. The extrusion device according to claim 7, characterized in that: The injection channel comprises an injection guide hole (41) and an injection through hole (42); the injection guide hole (41) is arranged in a conical through hole structure, while the injection through hole (42) is arranged in a round hole structure; the tube die (4) forms a gap for the rubber stock solution to flow out through the injection through hole (42) and the outer side surface of the tube punch (5); and the blade (1) is installed on the tube punch (5) near the side of the injection through hole (42); the relationship between the hole diameter d of the injection through hole (42) and the width b of the tight seam rubber to be extruded is d=b / 3.

14.

9. The extrusion device according to claim 8, characterized in that: The tube punch (5) is configured as a conical structure, a semicircular arc transition structure is provided at the front end of the tube punch (5), and a connecting portion is provided at the rear end thereof, and the tube punch (5) is connected to the punch connecting block (6) via the connecting portion; and a slot corresponding to the blade (1) is provided on the side surface of the tube punch (5) near its front end, and the blade (1) is detachably mounted on the tube punch (5) via the slot.

10. The extrusion device according to claim 9, characterized in that: The male mold connecting block (6) comprises a screw block (61) and a male mold body (62); the screw block (61) is configured as a T-shaped boss-shaped cavity structure; the external structure of the male mold body (62) matches the tube male mold (5); the male mold body (62) is located inside the screw block (61), and its front end extends to the outside of the screw block (61); a plurality of injection channels are provided in the male mold connecting block (6), and the plurality of injection channels are arranged in a ring state inside the screw block (61) outside the male mold body (62); a screw blind hole corresponding to the connecting portion in the tube male mold (5) is provided at the rear end of the male mold body (62); the tube male mold (5) is screwed into the screw blind hole through the connecting portion, thereby realizing a detachable connection between the tube male mold (5) and the male mold connecting block (6).

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