A rubberized cord layer processing equipment and an air spring air bag production process

Abstract

The application relates to a rubber-coated cord layer processing equipment and an air spring air bag production process, and relates to the technical field of air spring processing and production. The rubber-coated cord layer processing equipment comprises, in sequence, a cord guide opening device, a tension control device, a cord arrangement device, a rubber-coating device and a storage device. The rubber-coating device comprises a rubber extruder and a rubber-coating die head. The rubber-coating die head comprises, in sequence, an inlet template, a die body and an outlet template. A plurality of inlet holes are formed in the inlet template. A forming channel is formed in the die body. A forming outlet is formed in the outlet template. The inlet holes, the forming channel and the forming outlet are sequentially communicated. The rubber extruder is connected with the die body. A glue injection runner is formed in the die body. One end of the glue injection runner is communicated with the forming channel, and the other end of the glue injection runner is communicated with the rubber extruder. The application can make the cord layer have better interface bonding force, thereby improving the durability and reliability of the finally produced air bag.

Description

Technical Field

[0001] This application relates to the technical field of air spring processing and production, and in particular to a processing equipment for rubber-coated cord layers and a production process for air spring airbags. Background Technology

[0002] An air spring is an elastic element that uses the restoring force of compressed air to achieve shock absorption and cushioning. It is widely used in automotive suspensions, rail transportation, commercial vehicles, and industrial machinery. The core pressure-bearing and sealing component of an air spring is the air bladder, which must withstand the expansion force of the internal high-pressure gas and cope with complex, high-frequency dynamic alternating loads during use. To ensure sufficient strength, pressure resistance, and flexibility, air spring air bladders are typically made of a composite of rubber and cord. The cord, as the skeleton layer, plays a major role in bearing the load and limiting excessive air bladder expansion, while the rubber seals the gas and protects the cord from wear.

[0003] Currently, existing air spring airbags are typically manufactured using a layered bonding process. Specifically, the process involves first using a rubber layer as the inner layer, then rotating and bonding a cord layer to the outside of the inner layer, followed by rotating and bonding an outer rubber layer as the outer layer. Finally, a vulcanization process is used to solidify all layers together, and after cutting, the final airbag is formed. The inner and outer rubber layers, as well as the cords used in the cord layer, all require separate calendering. After calendering, they need to be cut into appropriately sized small cord layers and small rubber sheets before being transferred to the molding process for bonding. The entire production process involves numerous steps, requires large and expensive equipment, and each step is highly dependent on manual labor.

[0004] Regarding the aforementioned technologies, in the production process of the airbag, on the one hand, because the cord layers are pre-calendered and cut separately before being rotated and bonded to the outside of the inner rubber layer, the structure of each layer is relatively stable before vulcanization and curing, resulting in weak interfacial bonding between the cord layers and the inner and outer rubber layers; on the other hand, the rotational bonding method easily leads to multiple cord overlaps at the cord layer joints, which easily become stress concentration points. Therefore, during the process of the airbag being subjected to repeated dynamic alternating loads, stress concentration easily occurs at the interface between layers and at the cord overlaps, leading to early damage phenomena such as cord delamination and interlayer delamination. Summary of the Invention

[0005] This application provides a processing equipment for coated cord layers and a manufacturing process for air spring airbags. The purpose is to continuously process the cords into coated cord layers to replace the existing cord layers, so that the cord layers have better interfacial bonding force and the cords can be evenly arranged in the airbag embryo without overlapping, thereby improving the durability and reliability of the final airbag under repeated dynamic alternating loads.

[0006] Firstly, the technical solution adopted by the adhesive-coated cord layer processing equipment provided in this application is as follows: A rubber-coated cord processing device includes: a cord unwinding device, a tension control device, a cord arranging device, a rubber coating device, and a material storage device arranged sequentially. The cord unwinding device is used to unwind a plurality of cords and pass them sequentially through the tension control device, the cord arranging device, the rubber coating device, and the material storage device. The rubber coating device includes a rubber extruder and a rubber coating die head. The rubber coating die head includes an inlet template, a die body, and an outlet template connected sequentially. The inlet template has a plurality of inlet holes for the cords to pass through. The die body has a forming channel, and the outlet template has a forming outlet. The inlet holes, the forming channel, and the forming outlet are sequentially connected. The rubber extruder is connected to the die body, and the die body has a rubber injection channel. One end of the rubber injection channel is connected to the forming channel, and the other end is connected to the rubber extruder.

[0007] By adopting the above technical solution, when processing the rubber-coated cord layer using the above processing equipment, the cords are led out from the cord opening device and then pass through the tension control device for tension adjustment, making the cords taut and tight. Then, they enter the cord arranging device to achieve parallel arrangement of several cords at a preset spacing. After that, the parallel cords pass through the inlet hole of the inlet template into the forming channel of the mold body. At the same time, the rubber extruder injects plasticized rubber into the forming channel. The rubber fills the gaps between the cords and completely covers the outer surface of the cords, forming a rubber layer with embedded cords, i.e., the rubber-coated cord layer. Subsequently, the rubber-coated cord layer is extruded from the forming outlet of the outlet template. Finally, the extruded rubber-coated cord layer is collected and stored by the storage device.

[0008] This processing equipment allows the cords to be continuously processed into coated cord layers before airbag production, replacing the existing method of separately fabricating and rotating the cord layers for bonding. On one hand, compared to the conventional bonding method which requires separately calendering the cord layers, cutting them, and then bonding them in layers, the coated cord layers can be directly bonded to the inner film after production. This simplifies both the equipment and the process, enabling continuous and automated production of airbag preforms, reducing reliance on manual labor, and improving production efficiency and product quality uniformity. Furthermore, the coated cord layer process ensures uniform cord arrangement within the airbag preform, avoiding stress concentration caused by cord overlap in the existing bonding method. On the other hand, during the subsequent production of the airbag, when this rubber-coated cord layer is used to bond with the inner and outer rubber layers, the rubber on the surface of the rubber-coated cord layer can undergo sufficient molecular diffusion and cross-linking reaction with the rubber of the inner and outer rubber layers during vulcanization, forming a strong vulcanization bonding interface. This improves the interfacial bonding force between the rubber-coated cord layer and the inner and outer rubber layers inside the airbag, reduces the risk of early damage such as cord pulling and interlayer delamination under repeated dynamic alternating loads, and improves the fatigue life and reliability of the air spring airbag.

[0009] Optionally, the cord arrangement device includes a cord comb, which includes a comb base and a plurality of cord-separating teeth. The comb base is horizontally arranged, and the plurality of cord-separating teeth are arranged sequentially at intervals along the length direction of the comb base. Adjacent two cord-separating teeth are spaced apart to form a cord-laying groove. The cord-laying groove is arranged in a one-to-one correspondence with the cord inlet hole, and the cord-laying groove is used for passing the cord through.

[0010] By adopting the above technical solution, after several cords pass through the grooving groove on the splitter, the several cords are separated and arranged in parallel at a preset equal interval. This allows the several cords to enter the coating device with a stable interval and in a parallel state, thereby improving the uniformity and consistency of the cord arrangement in the final coated cord layer.

[0011] Optionally, the cord arrangement device further includes a limiting strip, which is arranged parallel to and spaced apart from the comb seat, and the dividing teeth are located on the side of the comb seat facing the limiting strip. The limiting strip and a plurality of the dividing teeth are detachably connected.

[0012] By adopting the above technical solution, when the cord passes through the cable tray, the limiting strip can prevent the cord from jumping out of the cable tray due to its own tension fluctuations or external vibrations during transmission.

[0013] Optionally, the dividing teeth slide in engagement with the comb holder along its length; a plurality of spacing adjustment plates are provided between two adjacent dividing teeth, the thickness direction of the spacing adjustment plates is set along the length direction of the comb holder, and the spacing adjustment plates slide in engagement with the comb holder along their own thickness direction; both ends of the comb holder are detachably connected to abutment seats, a plurality of dividing teeth are located between two abutment seats along the length direction of the comb holder, a handwheel screw is provided between the abutment seat and the adjacent dividing teeth, the handwheel screw is axially set along the length direction of the comb holder, the handwheel screw is screwed to the abutment seat, and one end of the handwheel screw abuts against the corresponding dividing tooth.

[0014] By adopting the above technical solution, the operator sequentially inserts the required number and thickness of spacing adjustment plates between adjacent dividing teeth. Then, the contact seats are installed at both ends of the comb holder and the handwheel screw is tightened. The handwheel screw axially presses the dividing teeth and spacing adjustment plates along the length of the comb holder, thus firmly locking each dividing tooth at the preset spacing position, forming a structurally stable dividing comb. Because this dividing comb can adjust the spacing between adjacent dividing teeth to accommodate different specifications of cord by replacing spacing adjustment plates of different thicknesses or adjusting the combination of spacing adjustment plates, the coated cord layer processing equipment has better production flexibility and can adapt to different production needs.

[0015] Optionally, the upper surface of the comb holder is provided with a sliding guide rail, the length direction of which is along the length direction of the comb holder; dovetail grooves are provided on the dividing teeth, the spacing adjustment plate, and the abutment seat, the dovetail grooves passing through the corresponding dividing teeth, the spacing adjustment plate, or the abutment seat along the length direction of the sliding guide rail, and the sliding guide rail is inserted into the dovetail grooves; a locking bolt is also screwed onto the abutment seat, one end of which abuts against the sliding guide rail.

[0016] By adopting the above technical solution, the sliding guide rail and the dovetail groove are engaged to guide and limit the sliding direction of the parting teeth, the spacing adjustment plate, and the contact seat. At the same time, the contact seat can be first fixed to the sliding guide rail on the comb seat by locking bolts, and then the parting teeth and the spacing adjustment plate are axially pressed by the handwheel screw. This makes the position of the contact seat adjustable, thus making the entire parting comb more flexible.

[0017] Optionally, the inlet hole is elongated and its length direction is along the length direction of the comb seat. Several inlet holes are connected sequentially along their own length direction to form threading holes. An adapter threading plate is provided on the side of the inlet template away from the mold body. The adapter threading plate is detachably connected to the inlet template and closes the threading holes. Several threading holes for the cord to pass through are opened on the adapter threading plate, and the threading holes are connected to the threading holes.

[0018] By adopting the above technical solution, when the spacing of several cords needs to be adjusted, the threading holes provide clearance for the horizontal adjustment of the cords. Furthermore, the adapter threading plate seals the threading holes, preventing rubber from overflowing during injection, while the threading holes on the adapter threading plate ensure that the cords can pass through the plate and enter the threading holes. Since the adapter threading plate and the insertion template are detachably connected, the adapter threading plate can be removed and replaced to accommodate the adjusted cords.

[0019] Optionally, the adapter wire guide plate includes a base plate with a mounting groove extending through the base plate along its length. A plurality of wire guide modules are disposed on the base plate, each module being inserted into and slidably engaged with the base plate along the length of the mounting groove. Each wire guide module corresponds to a wire inlet hole, with the hole extending through the corresponding module. A plurality of thin plates are disposed between adjacent wire guide modules, their thickness extending along the length of the mounting groove. These plates are located within the mounting groove and slidably engaged with the base plate along their thickness. Limiting seats are detachably connected to both ends of the base plate along its length. A plurality of wire guide modules are positioned between two limiting seats along the base plate's length. An abutting screw is disposed between the limiting seat and an adjacent wire guide module, the screw axially extending along the base plate's length. The screw is threaded to the limiting seat, and one end of the screw abuts against the corresponding wire guide module.

[0020] By adopting the above technical solution, each threading module can slide along the length of the mounting groove, so the position of the threading hole can be adjusted accordingly based on the cord spacing after the split comb is adjusted.

[0021] When the operator adjusts the cord spacing, a corresponding number or thickness of thin plates can be placed between adjacent threading modules to keep the distance between adjacent threading holes consistent with the distance between adjacent branch teeth. After the threading modules and thin plates are combined, the limiting seats are installed on both ends of the base plate and the contact screws are tightened. The contact screws press the threading modules and thin plates from both ends toward the middle, locking all the threading modules in the mounting groove.

[0022] Therefore, the adapter threading plate forms an adjustable thread entry structure corresponding to the thread divider, which keeps the cord in a straight conveying state from the thread divider to the coating die head, reducing the possibility of the cord being laterally deflected, frictionally worn, or experiencing sudden changes in local tension before entering the coating die head.

[0023] Secondly, the air spring airbag manufacturing process provided in this application adopts the following technical solution: An air spring airbag manufacturing process, utilizing the aforementioned adhesive-coated cord layer processing equipment, includes the following steps: S1, preparing an inner adhesive layer, an outer adhesive layer, and an adhesive-coated cord layer; S2, winding the inner adhesive layer onto a forming mandrel on a corresponding winding device, and after the adhesive-coated cord layer is output from the adhesive-coated cord layer processing device, rotating and attaching the adhesive-coated cord layer to the outside of the inner adhesive layer, and then rotating and winding the outer adhesive layer to form an airbag preform; S3, post-processing the airbag preform to form the final airbag product.

[0024] By adopting the above technical solution, the rubber-coated cord layer used in the production process of air spring airbags is produced by the aforementioned rubber-coated cord layer processing equipment. After production, the rubber-coated cord layer can be laminated onto the inner rubber sheet, replacing the existing production method that requires separate calendering, cutting, and layering. This allows the arrangement, coating, and lamination of the cords to be completed in a continuous process, which is conducive to continuous and automated production, reduces reliance on manual labor, and improves production efficiency and quality uniformity. During the production of airbags using this rubber-coated cord layer, each cord in the rubber-coated cord layer can be evenly distributed according to the preset winding angle without overlapping, improving the problem of local stress concentration caused by uneven cord spacing, weak cord-rubber bonding, or cord overlap. In the subsequent vulcanization and shaping process, the pre-coated rubber in the rubber-coated cord layer can fully diffuse and cross-link with the inner and outer rubber layers, forming a strong vulcanization bonding interface. This process improves the interfacial bonding between the cord layer, inner rubber layer, and outer rubber layer of the air spring airbag produced by this process, thereby enhancing the fatigue life and reliability of the airbag under repeated dynamic alternating loads.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a rubber-coated cord layer processing device to arrange and coat continuously unwound cords in the same process, forming a rubber-coated cord layer with embedded cords, which is then bonded to the inner rubber layer. On the one hand, this eliminates the need for separate calendering, cutting, and manual rotation bonding of the cord layer, allowing the cord arrangement, coating, and bonding to be completed in a continuous process. This facilitates continuous and automated production, reduces reliance on manual labor, and improves production efficiency and product quality uniformity. Furthermore, the cords in the rubber-coated cord layer are evenly arranged without overlapping, avoiding stress concentration at the joints in existing bonding methods. On the other hand, the rubber pre-coated on the surface of the rubber-coated cord layer can fully diffuse and cross-link with the inner and outer rubber layers during vulcanization, forming a strong vulcanized bonding interface. This improves the interfacial bonding force, reduces the risk of early damage such as cord delamination and interlayer delamination in the airbag under repeated dynamic alternating loads, and improves the fatigue life and reliability of the air spring airbag.

[0026] 2. This application, through the coordinated design of the wire sorting comb, the matching wire threading plate, and the wire entry template, ensures that the cords are always transported in a straight line with equal spacing from the wire sorting comb to the coating die head. This improves production flexibility and changeover efficiency, while also addressing the problems of bending, deviation, or sudden changes in local tension that occur during the cord transport process. This, in turn, improves the positional accuracy of the coated cord layer formation and the uniformity of the cord arrangement. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the adhesive-coated cord layer processing equipment of Embodiment 1 of this application.

[0028] Figure 2 This is a schematic diagram of the overall structure of the cord opening device in Embodiment 1 of this application.

[0029] Figure 3 This is a schematic diagram of the overall structure of the cord arrangement device in Embodiment 1 of this application.

[0030] Figure 4 This is a schematic diagram of the overall structure of the coating device in Embodiment 1 of this application.

[0031] Figure 5 This is a cross-sectional structural schematic diagram of the adhesive coating mold head of Embodiment 1 of this application.

[0032] Figure 6 This is a schematic diagram of the overall structure of the guide roller group, the linear conveyor belt, and the cutting assembly in Embodiment 1 of this application.

[0033] Figure 7 This is a partial structural schematic diagram of the cord arrangement device and the adhesive coating die head of Embodiment 2 of this application.

[0034] Figure 8 This is a schematic diagram of the overall structure of the cord arrangement device in Embodiment 2 of this application.

[0035] Figure 9 This is a schematic diagram of the overall structure of the inlet template in Embodiment 2 of this application.

[0036] Figure 10 This is a schematic diagram of the overall structure of the adapter threading plate in Embodiment 2 of this application.

[0037] Figure 11 This is a schematic diagram of the overall structure of the cord pretreatment device according to Embodiment 3 of this application.

[0038] In the diagram, 1 is the cord opening device; 11 is the cord feeding frame; 12 is the cord feeding shaft; 13 is the cord reel; and 14 is the conductor roller. 2. Tension control device; 3. Cord aligning device; 31. Cord comb; 311. Comb base; 312. Cord teeth; 3121. Cord clamping groove; 313. Cord routing groove; 315. Spacing adjustment plate; 316. Contact seat; 317. Handwheel screw; 318. Sliding guide rail; 319. Dovetail groove; 320. Locking bolt; 32. Limiting strip; 321. Connecting elongated hole; 322. Fixing bolt; 4. Adhesive coating device; 41. Glue-coated die head; 411. Wire inlet template; 4111. Wire inlet hole; 4112. Wire threading hole; 412. Mold body; 4121. Molding channel; 4122. Glue injection channel; 413. Outlet template; 4131. Molding outlet; 4144. Adaptor threading plate; 4141. Wire threading hole; 4142. Base plate; 4143. Mounting groove; 4144. Wire threading module; 4145. Thin plate; 4146. Limiting seat; 4147. Abutting screw; 42. Rubber extruder; 5. Material storage device; 51. Guide roller assembly; 511. Roller frame; 512. Lead-out roller; 513. Guide gap; 514. Guide motor; 52. Cutting assembly; 521. Knife holder; 522. Cylinder; 523. Knife base; 524. Cutting knife; 53. Material storage rack; 531. Drive base; 54. Linear conveyor belt; 6. Cord pretreatment device; 61. Preheating mechanism; 611. Preheating rack; 612. Infrared heating head; 62. Plasma treatment mechanism; 621. Treatment rack; 622. Plasma nozzle. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 - Appendix Figure 11 This application will be described in further detail below.

[0040] Example 1: A processing equipment for coated cord layers, referring to... Figure 1 It includes a cord opening device 1, a tension control device 2, a cord arranging device 3, an adhesive coating device 4, and a material storage device 5 arranged in sequence.

[0041] Based on the above structural design, after the cord is led out from the cord opening device 1, it passes through the tension control device 2 for tension adjustment, so that the cord is straightened and tightened; then the cord enters the cord arranging device 3, so that several cords are arranged in parallel at a preset interval; then, the several parallel cords enter the rubber coating device 4, where several cords are wrapped with rubber in the rubber coating device 4, thereby forming a rubber layer with embedded cords, that is, the rubber-coated cord layer; finally, the rubber-coated cord layer is transported to the storage device 5 for natural cooling and temporary storage.

[0042] Reference Figure 1 and Figure 2The cord guiding device 1 includes a cord feeding frame 11, on which a cord feeding shaft 12 is rotatably mounted and horizontally positioned. Several cord reels 13 are coaxially sleeved on the outer side of the cord feeding shaft 12, each reel having cord pre-wound on it. The reels 13 are arranged sequentially along the axial direction of the cord feeding shaft 12, and are fixedly connected to the cord feeding shaft 12.

[0043] Reference Figure 1 and Figure 2 A plurality of guide rollers 14 are rotatably mounted on the wire feeding frame 11. The guide rollers 14 are all arranged parallel to and spaced apart from the wire feeding shaft 12. A plurality of guide ring grooves are opened on the outer side wall of the guide rollers 14. The guide ring grooves are arranged sequentially along the axial direction of the guide rollers 14, and the guide ring grooves are arranged one-to-one with the wire reel 13. The guide rollers 14 are arranged sequentially and spaced apart between the tension control device 2 and the wire feeding shaft 12 in the horizontal direction, and adjacent two guide rollers 14 are arranged spaced apart in the vertical direction.

[0044] Based on the structural design of the cord opening device 1, several cords are released from the corresponding reels 13 and pass through the corresponding guide ring grooves on several guide rollers 14 in sequence, so that the several cords are arranged in a parallel state with equal spacing and enter the tension control device 2.

[0045] Reference Figure 1 The tension control device 2 adopts a magnetic powder automatic tension controller or a servo closed-loop tension controller, and several cords pass through the tension control device 2, which can adjust the tension of the passing cords so that all cords can be kept taut and taut during transport.

[0046] It should be noted that the tension control device 2 is a mature existing technology in winding / unwinding equipment for textile, cable, and tire cord production, and will not be elaborated on here.

[0047] Reference Figure 1 and Figure 3 The cord arrangement device 3 includes a cord separating comb 31, which includes a comb base 311 and a plurality of cord separating teeth 312. The comb base 311 is elongated and its length direction is arranged along the interval direction of the cords. The plurality of cord separating teeth 312 are located on the upper side of the comb base 311 and are fixedly connected to the comb base 311. The plurality of cord separating teeth 312 are arranged evenly and sequentially along the length direction of the comb base 311, which forms a cord tracing groove 313 between two adjacent cord separating teeth 312. The cord tracing groove 313 is arranged in a one-to-one correspondence with the cord reel 13, that is, the cord is arranged in a one-to-one correspondence with the cord tracing groove 313, and the cord unwound on the corresponding cord reel 13 passes through the corresponding cord tracing groove 313, and the cord slides along its own length direction with the inner wall of the corresponding cord tracing groove 313.

[0048] With the design of the splitting comb 31, several cords after passing through the tension control device 2 enter the corresponding cord trays 313 in sequence. Two adjacent splitting teeth 312 limit and constrain the two sides of the cords, so that the cords are separated and arranged in parallel at a preset equal interval, forming a neat cord array. This ensures that the cords can enter the coating device 4 with a consistent spacing and parallel state, thereby ensuring the uniformity and consistency of the cord arrangement in the subsequent coated cord layer.

[0049] Reference Figure 3 The cord arrangement device 3 also includes a limiting strip 32, which is arranged parallel to and spaced apart from the comb seat 311. A number of branch teeth 312 are located between the limiting strip 32 and the comb seat 311, and the two ends of the limiting strip 32 are connected to the corresponding branch teeth 312 by bolts.

[0050] In this embodiment, each of the dividing teeth 312 has a wire-locking groove 3121 at its upper end. The wire-locking groove 3121 passes through the corresponding dividing tooth 312 along the length direction of the comb seat 311. The limiting strip 32 is inserted and engaged with all the wire-locking grooves 3121 along its own length direction.

[0051] With the design of the limiting strip 32, when the cord passes through the corresponding cable tray 313, the limiting strip 32 limits the cord to prevent the cord from jumping out of the corresponding cable tray 313.

[0052] Reference Figure 1 and Figure 4 The coating device 4 includes a coating die head 41, which is located horizontally between the cord arrangement device 3 and the material storage device 5.

[0053] Reference Figure 4 and Figure 5 The coating die head 41 includes an inlet template 411, a die body 412, and an outlet template 413. The inlet template 411, die body 412, and outlet template 413 are arranged sequentially along the conveying direction of the cord, and the inlet template 411 and outlet template 413 are fixedly installed on opposite sides of the die body 412. The inlet template 411 has several inlet holes 4111, which are spaced apart horizontally. The die body 412 has a forming channel 4121 that extends through the die body 412 along the cord conveying direction. The outlet template 413 has a forming outlet 4131, which is elongated and its length is aligned with the spacing of the inlet holes 4111. The wire inlet hole 4111, the forming channel 4121 and the forming outlet 4131 are connected in sequence. The wire inlet hole 4111 is set to correspond one-to-one with the cord. The cord passes through the corresponding wire inlet hole 4111 into the corresponding forming channel 4121.

[0054] Reference Figure 4 and Figure 5 The molding channel 4121 is connected to the molding outlet 4131. The mold body 412 is also provided with a material injection channel 4122. One end of the material injection channel 4122 is connected to the molding channel 4121, and the other end passes through the mold body 412.

[0055] Reference Figure 1 and Figure 4 The rubber coating device 4 also includes a rubber extruder 42, which is connected to the mold body 412, and the rubber outlet of the rubber extruder 42 is connected to the rubber injection channel 4122.

[0056] Under the design of the coating device 4, several cords sequentially pass through the corresponding inlet holes 4111 on the inlet template 411 into the forming channel 4121. At the same time, the rubber extruder 42 extrudes the plasticized rubber compound into the forming channel 4121. At this time, the rubber compound fills the forming channel 4121, which allows the rubber compound to fill the gaps between the cords, so that the rubber compound completely covers the outer surface of the cords, thereby forming a rubber layer with embedded cords, i.e., a rubber-coated cord layer. After this, the rubber-coated cord layer is extruded from the forming outlet 4131, and the cross-section of the rubber-coated cord layer is shaped by the cross-sectional shape of the forming outlet 4131, thereby forming a rubber-coated cord layer with a regular cross-section.

[0057] In this embodiment, the rubber extruder 42 is a cold-feed pin-type extruder, a cold-feed venting type extruder, or a hot-feed extruder.

[0058] Reference Figure 1 and Figure 6 The storage device 5 includes a guide roller group 51, a cutting component 52, and a storage rack 53. The guide roller group 51, the cutting component 52, and the storage rack 53 are arranged in sequence. The guide roller group 51 is located between the cutting component 52 and the adhesive coating die head 41. A straight conveyor belt 54 is provided between the cutting component 52 and the guide roller group 51, and between the cutting component 52 and the storage rack 53.

[0059] Reference Figure 6 The guide roller assembly 51 includes a roller frame 511, on which two lead-out rollers 512 are rotatably mounted. The lead-out rollers 512 are horizontally positioned, and the two lead-out rollers 512 are spaced apart vertically to form a guide gap 513. The coated cord layer output from the coating die head 41 passes through the guide gap 513. Two guide motors 514 are mounted on the roller frame 511, and each guide motor 514 is correspondingly positioned to one of the lead-out rollers 512. One end of each lead-out roller 512 is coaxially connected to the output shaft of the corresponding guide motor 514.

[0060] In this embodiment, the roller face of the lead-out roller 512 is coated with a polytetrafluoroethylene layer or a rubber layer to prevent the hot rubber on the surface of the coated cord layer from sticking to the roller face of the lead-out roller 512. Simultaneously, the guide motor 514 drives the two lead-out rollers 512 to rotate synchronously in opposite directions, and the rotational linear velocity of the two lead-out rollers 512 matches the adhesive dispensing speed of the coating die head 41, thereby enabling the coated cord layer to be smoothly output from the coating die head 41 at a constant speed.

[0061] Reference Figure 1 and Figure 6 The cutting assembly 52 includes a blade holder 521, a cylinder 522, a blade base 523, and a cutter 524. The blade base 523 is fixed on the blade holder 521, and the cutter 524 is located directly above the blade base 523, with the cutter 524 and the blade base 523 facing each other vertically. The cutter 524 slides vertically with the blade holder 521. The cylinder 522 is fixedly mounted on the blade holder 521 and is located above the cutter 524. The cylinder 522 is vertically positioned, and its drive section is connected to the cutter 524.

[0062] With the design of the cutting assembly 52, the rubber-coated cord layer output from the guide roller group 51 is conveyed to the cutter holder 523 via the linear conveyor belt 54. When the rubber-coated cord layer reaches the preset length, the cylinder 522 drives the cutter 524 to move downwards in the vertical direction. The cutter 524 cooperates with the cutter holder 523 to cut the rubber-coated cord layer, thereby cutting the continuous rubber-coated cord layer into fixed-length rubber-coated cord layers. After cutting, the cylinder 522 drives the cutter 524 to reset, waiting for the next cutting action.

[0063] Reference Figure 1 The storage rack 53 is horizontally arranged, and a drive base 531 is provided below the storage rack 53. A drive motor is provided in the drive base 531. The drive motor is connected to the storage rack 53 to drive the storage rack 53 to rotate, so that different positions on the storage rack 53 rotate sequentially to the output end of the corresponding linear conveyor belt 54. Thus, when the fixed-length coated cord layer cut by the cutting component 52 is conveyed to the storage rack 53 via the linear conveyor belt 54, the coated cord layer falls off sequentially and is laid in sections on different sections of the storage rack 53, realizing the temporary storage of the coated cord layer.

[0064] The implementation principle of this application embodiment is as follows: through the cooperation of the rubber coating die head 41 and the rubber extruder 42, the plasticized rubber compound is continuously injected into the molding channel 4121 through the rubber injection channel 4122, continuously coating several parallel cords entering from the wire inlet hole 4111, and extruding and shaping through the molding outlet 4131, thereby producing a rubber layer with embedded cords, namely the rubber-coated cord layer.

[0065] Therefore, in the subsequent bladder molding process, the use of a rubber-coated cord layer process replaces the existing cord layer production process that requires separate calendering, cutting, and bonding. This allows the cord arrangement, rubber coating, and bonding to be completed in a continuous process, which is beneficial for continuous and automated production and reduces reliance on manual labor. Simultaneously, the cords in the rubber-coated cord layer are arranged in parallel without overlapping, avoiding stress concentration at the joints of the cord layers in the existing bonding method. Furthermore, the rubber on the surface of the rubber-coated cord layer can undergo sufficient molecular diffusion and cross-linking reactions with the inner and outer rubber layers, forming a strong vulcanized bonding interface. This improves the interfacial bonding force between the rubber-coated cord layer and the inner and outer rubber layers inside the airbag, reducing the risk of early damage such as cord delamination and interlayer delamination under repeated dynamic alternating loads, and improving the fatigue life and reliability of the air spring airbag.

[0066] This embodiment also discloses an air spring airbag manufacturing process, including the following steps: S1. Prepare the inner adhesive layer, outer adhesive layer, and adhesive-coated cord layer.

[0067] Specifically, step S1 includes the following steps: Based on the performance requirements of the air spring airbag, select the corresponding rubber compound. The rubber compound can be one or more blends of natural rubber, styrene-butadiene rubber, chloroprene rubber or ethylene propylene diene monomer (EPDM) rubber. Add vulcanizing agents, accelerators, antioxidants, reinforcing fillers and softeners to the rubber compound to prepare a rubber compound that meets the process requirements.

[0068] The aforementioned rubber compound is calendered into a continuous rubber layer of a predetermined thickness using a calender, and then cut according to the required dimensions of the inner and outer rubber layers to obtain inner and outer rubber layers of corresponding specifications. Simultaneously, the aforementioned rubber-coated cord layer processing equipment is used to produce the rubber-coated cord layer.

[0069] S2. The inner rubber layer is wound on the forming mandrel of the corresponding winding equipment. After the rubber-coated cord layer is output from the rubber-coated cord layer processing equipment, the rubber-coated cord layer is rotated and attached to the outside of the inner rubber layer. Then the outer rubber layer is wound by rotation to form a blastocyst.

[0070] Specifically, step S2 includes the following steps: First, the cleaned molding mandrel is installed on the winding equipment. The outer diameter of the molding mandrel is designed according to the inner diameter of the air spring bladder. The outer surface of the molding mandrel is pre-coated with a release agent to facilitate the subsequent demolding of the bladder.

[0071] Then, the winding equipment is started to wind the inner rubber layer on the molding mandrel to form a molding mandrel with the inner rubber layer; after the rubber-coated cord layer is output from the rubber-coated cord layer processing equipment, the rubber-coated cord layer is rotated and bonded to the molding mandrel with the inner rubber layer, and then the outer rubber layer is rotated and bonded to the molding mandrel with the inner rubber layer and the rubber-coated cord layer to finally form the blastocyst.

[0072] In this embodiment, depending on the load-bearing capacity requirements of the air spring airbag, a single layer of adhesive-coated cord can be wound, or two or more layers of adhesive-coated cord can be wound continuously, thereby improving the airbag's pressure-bearing capacity and deformation resistance.

[0073] S3. Post-process the blastocyst to form the final airbag product.

[0074] Specifically, step S3 includes the following steps: S31. Pre-shape the blastocyst to initially shape it and remove it from the molding mandrel.

[0075] Specifically, step S31 includes the following steps: removing the entire molding mandrel with the preform from the winding equipment, and then placing the preform along with the molding mandrel into a pre-forming device. Inside the pre-forming device, the preform is held at a temperature of 60°C to 80°C for 10 to 15 minutes to allow for slight plastic deformation, further tightening the inner adhesive layer, the adhesive-coated cord layer, and the outer adhesive layer, thus initially fixing the shape of the preform. After pre-forming is completed, the preform is cooled to room temperature, and then separated from the molding mandrel.

[0076] S32. Cut the blastocyst to the corresponding size according to the design size of the blastocyst.

[0077] Specifically, in step S32, during the cutting process of placing the blastocyst into the cutting equipment, it is essential to ensure precise cutting position and a smooth, burr-free end face to avoid adverse effects on the subsequent vulcanization and setting quality due to end face defects. After cutting, the cut end face is cleaned to remove any attached rubber debris and cord lint, resulting in a cut blastocyst that meets the required length dimensions.

[0078] S33. Expand and shape the blastocyst to achieve the designed geometry.

[0079] Specifically, step S33 includes the following steps: The cut blastocyst is placed in an expansion and shaping device, which includes a shaping mold with an airbag design. Both ends of the blastocyst are sealed with end caps. After sealing, compressed air is introduced into the blastocyst through an air inlet pipe. The compressed air pressure is controlled within the range of 0.2 MPa to 0.4 MPa. Under the action of compressed air pressure, the blastocyst gradually expands from its original cylindrical shape to the target shape consistent with the inner cavity of the shaping mold. During the expansion and shaping process, the internal pressure of the blastocyst should be kept stable. The pressure holding time during expansion and shaping is 3 to 5 minutes to ensure that the geometry of the blastocyst meets the design requirements and has good shape memory.

[0080] S34. The blastocyst is vulcanized and shaped to form the final airbag product.

[0081] Specifically, step S34 includes the following steps: The expanded and shaped capsule preform, along with the shaping mold, is placed into a vulcanizing device for vulcanization. The vulcanizing device can be a tank vulcanizing machine or a flat vulcanizing machine. During vulcanization, the rubber compound inside the capsule undergoes a cross-linking reaction under high temperature and the action of the vulcanizing agent. A stable three-dimensional network structure is formed between the rubber molecular chains. The inner rubber layer, the rubber-coated cord layer, and the outer rubber layer are completely bonded together under high temperature and high pressure, thus transforming the capsule preform from a plastic rubber semi-finished product into a vulcanized rubber product with high elasticity, high strength, and high durability. After vulcanization, the capsule preform forms a finished airbag. The finished airbag is then removed from the vulcanizing device and detached from the shaping mold. After cooling, deburring, and surface cleaning, a final airbag product with precise dimensions and stable performance is obtained.

[0082] The implementation principle of this application embodiment is as follows: This air spring airbag production process realizes the continuous and standardized production of air spring airbags from raw materials to finished products.

[0083] In step S1, the inner rubber layer, outer rubber layer, and coated cord layer are prepared. In step S2, the inner rubber layer, outer rubber layer, and coated cord layer are wound together to form a capsule embryo through a winding molding process. In step S3, the capsule embryo is transformed into the final airbag product through pre-shaping, cutting, expansion shaping, and vulcanization shaping.

[0084] It is particularly important to note that the rubber-coated cord layer used in step S2 is produced by the aforementioned rubber-coated cord layer processing equipment. This rubber-coated cord layer has precise cord spacing, a strong bond between the cord and rubber interface, and uniform coating thickness. Furthermore, it is integrally formed in a continuous process, replacing the existing cord layers that require separate calendering, cutting, and bonding. This facilitates continuous and automated production, reduces reliance on manual labor, and improves production efficiency and quality uniformity. Thus, during the winding process, each cord in the rubber-coated cord layer can be evenly distributed according to the preset winding angle without overlapping, improving the problem of local stress concentration caused by uneven cord spacing, weak cord rubber bonding, or cord overlap. In the subsequent vulcanization and shaping process, the rubber in the rubber-coated cord layer can fully diffuse and cross-link with the inner and outer rubber layers, thereby improving the interfacial bonding force between the inner rubber layer, the rubber-coated cord layer, and the outer rubber layer, reducing early damage phenomena such as cord delamination and interlayer delamination in the airbag, and thus improving the fatigue life and reliability of the airbag under repeated dynamic alternating loads.

[0085] Example 2: A processing equipment for coated cord layers, referring to... Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 is that in the parting comb 31, a number of parting teeth 312 slide and engage with the comb base 311 along the length direction of the comb base 311.

[0086] Reference Figure 8 A plurality of spacing adjustment plates 315 are provided between two adjacent dividing teeth 312. The thickness direction of the spacing adjustment plates 315 is arranged along the length direction of the comb seat 311. The spacing adjustment plates 315 slide in cooperation with the comb seat 311 along their own thickness direction. The plurality of spacing adjustment plates 315 are arranged sequentially along their own thickness direction, and the spacing adjustment plates 315 abut against the adjacent spacing adjustment plates 315 or the adjacent dividing teeth 312.

[0087] Reference Figure 8 The comb holder 311 has detachable abutment seats 316 at both ends along its length. Several dividing teeth 312 are located between two abutment seats 316 along the length of the comb holder 311. A handwheel screw 317 is provided between the abutment seat 316 and the adjacent dividing tooth 312. The handwheel screw 317 is axially arranged along the length of the comb holder 311. The handwheel screw 317 is screwed to the abutment seat 316, and one end of the handwheel screw 317 abuts against the corresponding dividing tooth 312.

[0088] With this design, the operator sequentially inserts the required number and thickness of the spacing adjustment plates 315 between adjacent dividing teeth 312, and pushes all the spacing adjustment plates 315 and dividing teeth 312 together along the length of the comb seat 311. Then, two abutment seats 316 are installed, and the handwheel screws 317 on the two abutment seats 316 are tightened. At this time, the two handwheel screws 317 apply pressure to each other along the length of the comb seat 311, pressing and locking all the spacing adjustment plates 315 and dividing teeth 312, thereby steadily maintaining the position of each dividing tooth 312 along the length of the comb seat 311.

[0089] Based on the above structure, operators only need to replace the spacing adjustment plates 315 of different thicknesses or adjust the combination of several spacing adjustment plates 315 to flexibly adjust the distance between adjacent dividing teeth 312 within a large range, thereby improving the production flexibility of the coated cord layer processing equipment and shortening the changeover time between multiple specifications of products.

[0090] In this embodiment, refer to Figure 8 The upper surface of the comb holder 311 is provided with a sliding guide rail 318, the length of which is along the length of the comb holder 311. Dovetail grooves 319 are formed on the parting teeth 312, the spacing adjustment plate 315, and the contact seat 316, respectively, and these grooves penetrate the corresponding parting teeth 312, spacing adjustment plate 315, or contact seat 316 along the length of the comb holder 311. The sliding guide rail 318 is inserted into the dovetail groove 319, and the parting teeth 312, spacing adjustment plate 315, and contact seat 316 are all slidably engaged with the sliding guide rail 318 along its length. Several locking bolts 320 are screwed onto the contact seat 316, one end of which abuts against the sliding guide rail 318.

[0091] Based on this structural design, the cooperation between the sliding guide rail 318 and the dovetail groove 319 guides and limits the sliding direction of the dividing teeth 312, the spacing adjustment plate 315, and the contact seat 316. This ensures that the dividing teeth 312 and the spacing adjustment plate 315 can only move along the length of the comb seat 311, and are less likely to move up and down or shift back and forth relative to the comb seat 311, thus guaranteeing the straightness and positional stability of each dividing tooth 312 during the adjustment process. Furthermore, because the dovetail groove 319 and the sliding guide rail 318 have a mutually interlocking limiting relationship, even if the dividing teeth 312 are affected by the tension fluctuations of the cord or equipment vibration during the operation of the cord, the dividing teeth 312 are not likely to detach from the comb seat 311 or tilt, thereby improving the overall structural stability of the dividing comb 31.

[0092] Meanwhile, the abutment seat 316 can slide along the sliding guide rail 318 to a preset position via the dovetail groove 319, and be abutted and fixed to the sliding guide rail 318 by the locking bolt 320. Thus, after completing the combined adjustment of the dividing teeth 312 and the spacing adjustment plate 315, the operator can first move the abutment seat 316 to a position close to the outermost dividing teeth 312, then tighten the locking bolt 320 to lock the abutment seat 316, and finally use the handwheel screw 317 to axially press the dividing teeth 312 and the spacing adjustment plate 315. Therefore, the locking bolt 320 is used to fix the abutment seat 316 to the comb seat 311, and the handwheel screw 317 presses the dividing teeth 312 and the spacing adjustment plate 315 together. The two work together to improve the locking reliability after the spacing of the dividing teeth 312 is adjusted, preventing changes in the spacing of the dividing teeth 312 due to vibration during production, thereby ensuring a stable and consistent spacing of the cord array entering the coating die head 41.

[0093] In this embodiment, refer to Figure 8 The spacing adjustment plate 315 has one or more thicknesses, with each spacing adjustment plate 315 having a thickness of 0.05mm to 1.0mm. This allows the operator to select one or more spacing adjustment plates 315 in combination according to the required cord spacing, thereby allowing the spacing between two adjacent branch teeth 312 to be freely adjusted to adapt to the corresponding cord requirements.

[0094] In this embodiment, refer to Figure 8 The limiting strip 32 has a connecting elongated hole 321, the length of which is along the length of the limiting strip 32. Furthermore, a fixing bolt 322 is provided between the dividing tooth 312 adjacent to the abutment seat 316 and the limiting strip 32. The fixing bolt 322 is screwed to the corresponding dividing tooth 312, and passes through the connecting elongated hole 321.

[0095] With this design, no matter how the spacing between the dividing teeth 312 is adjusted, the fixing bolt 322 is always located in the corresponding connecting elongated hole 321, which can ensure the stability of the installation of the limiting strip 32, so that the limiting strip 32 always has the function of limiting the cord in the vertical direction.

[0096] Reference Figure 7 and Figure 9 In the coated die head 41, the wire inlet hole 4111 on the wire inlet template 411 is elongated, and the length direction of the wire inlet hole 4111 is set along the length direction of the comb seat 311. Several wire inlet holes 4111 are connected sequentially along their own length direction to form a threading hole 4112.

[0097] Reference Figure 7 and Figure 9An adapter threading plate 414 is provided on the side of the wire inlet template 411 facing away from the mold body 412. The adapter threading plate 414 is detachably connected to the wire inlet template 411 and closes the threading hole 4112. Several threading holes 4141 are provided through the adapter threading plate 414. The threading holes 4141 are arranged one-to-one with the wire spool 13, that is, the threading holes 4141 are arranged one-to-one with the cord, which allows the corresponding cord to pass through the corresponding threading hole 4141.

[0098] Based on the above design, the threading hole 4112 can reserve clearance for adjusting the horizontal position of the cord, so that after the splitter comb 31 adjusts the cord spacing, the cord can correspondingly change its position in the glue-coating die head 41 along the length of the threading hole 4112. Since the adapter threading plate 414 is detachably connected to the inlet template 411, the adapter threading plate 414 can be disassembled and replaced or the spacing of several threading holes 4141 can be adjusted according to changes in the cord spacing to accommodate the adjusted cord spacing specifications, ensuring that the cord is always conveyed in a straight line with equal spacing from the splitter comb 31 to the glue-coating die head 41.

[0099] In this embodiment, refer to Figure 10 The adapter board 414 includes a base plate 4142, which is detachably connected to the wire insertion template 411 by bolts. The length direction of the base plate 4142 is set along the length direction of the wire insertion hole 4112, and the base plate 4142 is provided with a mounting groove 4143, which passes through the base plate 4142 along the length direction of the base plate 4142.

[0100] Reference Figure 10 The adapter board 414 also includes several threading modules 4144. Each threading module 4144 is inserted into a mounting groove 4143 and slides along the length of the substrate 4142 against the inner wall of the mounting groove 4143. Several thin plates 4145 are disposed between adjacent threading modules 4144. The thickness of each thin plate 4145 is along the length of the substrate 4142, and each thin plate 4145 abuts against an adjacent threading module 4144 or an adjacent thin plate 4145 along its own thickness. The threading modules 4144 and the thin plates 4145 close the threading hole 4112.

[0101] Reference Figure 10The substrate 4142 is detachably connected to the two ends of the limiting seat 4146 along its length. The substrate 4142 and the limiting seat 4146 are connected by bolts. Several threading modules 4144 are located between two limiting seats 4146. An abutting screw 4147 is provided between the limiting seat 4146 and the adjacent threading module 4144. The abutting screw 4147 is axially arranged along the length of the substrate 4142. The abutting screw 4147 is screwed to the limiting seat 4146, and one end of the abutting screw 4147 abuts against the corresponding threading module 4144.

[0102] Reference Figure 10 Each threading module 4144 is configured to correspond one-to-one with a threading hole 4141, and the threading hole 4141 is opened through the corresponding threading module 4144.

[0103] With the structural design of the adapter threading plate 414, each threading module 4144 can slide along the length direction of the mounting groove 4143. Therefore, the position of the threading hole 4141 can be adjusted according to the cord spacing adjusted by the splitting comb 31. When adjusting the cord spacing, the operator can simultaneously place a corresponding number or thickness of thin plates 4145 between adjacent threading modules 4144 to make the distance between adjacent threading modules 4144 consistent with the distance between adjacent splitting teeth 312. After the threading modules 4144 and thin plates 4145 are combined, the limiting seat 4146 is installed at both ends of the substrate 4142 along its length direction, and the abutment screw 4147 is tightened. The abutment screw 4147 presses the threading modules 4144 and thin plates 4145 from both ends toward the middle, thereby locking all threading modules 4144 in the mounting groove 4143.

[0104] Therefore, referring to Figure 8 and Figure 10 The adapter threading plate 414 forms an adjustable thread entry structure corresponding to the splitting comb 31. The splitting comb 31 initially arranges the cords at equal intervals on the outside of the coating die head 41, and the adapter threading plate 414 performs secondary positioning and guidance on the cords after the spacing has been adjusted at the entrance of the coating die head 41. The two can maintain the same spacing specification, so that the cords are kept in a straight conveying state from the splitting comb 31 to the coating die head 41, reducing the possibility of lateral deviation, friction wear or local tension change of the cords before entering the coating die head 41.

[0105] At the same time, refer to Figure 9 and Figure 10 Since the threading module 4144 and the thin plate 4145 jointly seal the threading hole 4112, while making the position of the threading hole 4141 adjustable, the open area at the threading hole 4112 can be minimized, reducing the risk of rubber compound leaking from the inlet end of the coating die head 41, ensuring stable rubber pressure in the molding channel 4121, and making the rubber coating thickness in the coated cord layer more uniform.

[0106] The implementation principle of this application embodiment is as follows: When it is necessary to produce coated cord layers of different specifications, firstly, according to the design spacing of the cords in the target coated cord layer, select the corresponding thickness and quantity of spacing adjustment plates 315, and install the spacing adjustment plates 315 sequentially between adjacent dividing teeth 312 so that the target spacing is formed between each dividing tooth 312. Subsequently, install the abutment seat 316 to both ends of the comb seat 311 and fix it with locking bolts 320, and then tighten the handwheel screws 317 so that the two handwheel screws 317 press against the dividing teeth 312 and the spacing adjustment plates 315 along the length direction of the comb seat 311, thereby completing the adjustment and locking of the cord spacing at the dividing comb 31.

[0107] Subsequently, the adapter threading plate 414 is adjusted synchronously according to the cord spacing adjusted by the wire comb 31. Specifically, the threading module 4144 is installed into the mounting groove 4143 of the base plate 4142, and a thin plate 4145 matching the spacing adjustment plate 315 at the wire comb 31 is placed between adjacent threading modules 4144, so that the distance between adjacent threading holes 4141 is consistent with the distance between adjacent cable trays 313; then the limiting seat 4146 is installed and the contact screw 4147 is tightened to press and fix the threading module 4144 and the thin plate 4145. After the adjustment is completed, the adapter threading plate 414 is installed on the side of the inlet template 411 away from the mold body 412, so that the threading module 4144 and the thin plate 4145 close the threading hole 4112.

[0108] During the production of the rubber-coated cord layer, the cords are led out from the spool 13 and enter the split comb 31 through the tension control device 2. The cords are arranged in a cord array with a preset spacing by the wire grooves 313 between the splitting teeth 312. Subsequently, the cord array continues to enter the corresponding threading holes 4141 on the adapter threading plate 414. The threading holes 4141 guide the cords a second time, so that the cords enter the rubber-coating die head 41 in a stable, straight position that matches the forming channel 4121. The rubber extruder 42 injects plasticized rubber compound into the forming channel 4121. The rubber compound coats the cords in the forming channel 4121 and is extruded through the forming outlet 4131 to form the rubber-coated cord layer.

[0109] Through the synchronously adjustable design of the wire separating comb 31 and the adapter threading plate 414, this embodiment can achieve rapid adjustment of the cord spacing without replacing the entire wire separating comb 31 and the coating die head 41. At the same time, the cords can maintain a straight and evenly spaced conveying state before entering the coating die head 41, thereby reducing cord wear, deviation and uneven tension caused by mismatched hole positions, and improving the changeover efficiency and forming quality of the coated cord layer.

[0110] Example 3: A processing equipment for coated cord layers, referring to... Figure 11The difference between this embodiment and embodiment 2 is that the coated cord layer processing equipment also includes a cord pretreatment device 6, which includes a preheating mechanism 61 and a plasma treatment mechanism 62. The cord arrangement device 3, the preheating mechanism 61, the plasma treatment mechanism 62 and the coated die head 41 are arranged sequentially along the cord conveying direction.

[0111] Reference Figure 11 The preheating mechanism 61 includes a preheating frame 611 and a plurality of infrared heating heads 612. The preheating frame 611 is vertically arranged, and a plurality of curtains pass through the preheating frame 611. The plurality of infrared heating heads 612 are arranged on the preheating frame 611, and are arranged sequentially along the interval direction of the plurality of curtains, and are vertically arranged.

[0112] Based on the design of the preheating mechanism 61, the several cords arranged by the cord arrangement device 3 pass through the preheating frame 611 before entering the coating device 4, and are non-contactly heated by several infrared heating heads 612. Since the several infrared heating heads 612 are arranged sequentially along the interval direction of the several cords, each infrared heating head 612 can cover the cords at different positions, so that each cord can be radiated and heated more evenly. By preheating the cords through the preheating mechanism 61, on the one hand, the temperature difference between the cords and the hot rubber compound in the coating die head 41 can be reduced, avoiding the local rapid cooling of the hot rubber when it comes into contact with the low temperature cords, which would lead to a decrease in rubber fluidity, thereby improving the uniformity of rubber coating on the outer surface of the cords; on the other hand, preheating can remove trace amounts of moisture adsorbed on the surface of the cords, reducing the possibility of bubbles generated due to moisture vaporization during the coating process, thereby improving the interfacial bonding quality between the cords and rubber in the coated cord layer.

[0113] In this embodiment, the infrared heating head 612 uses a point-shaped infrared radiation element. The heating temperature of the infrared heating head 612 is controlled within a closed-loop range of 40°C to 80°C by a temperature controller. This temperature range reduces the temperature difference between the cord and the hot rubber compound inside the coating die 41 when the cord enters the die. The power of a single infrared heating head 612 ranges from 20W to 100W. Under suitable preheating temperature, the micro-expansion effect occurs in the micro-gap between the cord fibers. This facilitates the full penetration of the rubber compound into the gaps between the cord fibers during the subsequent coating process, improving the wetting degree of the rubber on the cord, and thus enhancing the bonding force between the rubber and the cord in the coated cord layer.

[0114] Reference Figure 11The plasma processing mechanism 62 includes a processing frame 621 and a plurality of plasma nozzles 622. The processing frame 621 is vertically arranged, and a plurality of curtains pass through the processing frame 621. The plurality of plasma nozzles 622 are arranged on the processing frame 621, and the plurality of plasma nozzles 622 are arranged sequentially along the interval direction of the plurality of curtains. The plasma nozzles 622 are vertically arranged.

[0115] In this embodiment, the plasma nozzle 622 is a miniature plasma nozzle of atmospheric pressure dielectric barrier discharge type. The distance between the outlet of the plasma nozzle 622 and the surface of the curtain is 5mm to 15mm. The power range of a single plasma nozzle 622 is 50W to 200W. The working atmosphere of the plasma nozzle 622 is compressed air.

[0116] Based on the design of the plasma treatment mechanism 62, each cord is subjected to atmospheric pressure plasma surface activation treatment by the corresponding plasma nozzle 622 before entering the coating device 4. On the one hand, plasma can introduce polar functional groups such as hydroxyl and carbonyl groups onto the cord surface, enhancing the chemical activity of the cord surface; on the other hand, plasma can form a micro-rough morphology on the cord surface, enhancing the mechanical anchoring ability of the cord surface. This improves the interfacial adhesion between the cord and the rubber, thereby increasing the fatigue life of the air spring bladder made from the coated cord layer.

[0117] The implementation principle of this application embodiment is as follows: During the conveying process of the cord, the cord passes sequentially through the preheating mechanism 61 and the plasma treatment mechanism 62. In the preheating mechanism 61, several infrared heating heads 612 in the preheating mechanism 61 perform non-contact radiative heating on the cord, raising the cord temperature to a suitable range for subsequent coating, removing any trace moisture that may be adsorbed on the cord surface, and reducing the temperature difference between the cord and the heated rubber in the coating die 41. In the plasma treatment mechanism 62, plasma nozzles 622 perform atmospheric pressure plasma treatment on the cord surface, removing trace contaminants such as oil and dust from the cord surface, and generating polar functional groups and a micro-rough structure on the cord surface, thereby improving the activity and wettability of the cord surface.

[0118] Through the synergistic action of the preheating mechanism 61 and the plasma treatment mechanism 62, the cord can undergo dehumidification preheating, reduction of interfacial temperature difference, surface activation, and roughening treatment before coating. Consequently, in the coating device 4, the rubber can more fully coat the cord and form a strong bond with it, thereby reducing defects such as interfacial bubbles, exposed cords, and insufficient adhesion in the coated cord layer. This improves the overall structural stability of the coated cord layer and further enhances the durability and reliability of the subsequently produced air spring bladder under repeated dynamic alternating loads.

[0119] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A processing equipment for coated cord layers, characterized in that, include: The cord opening device (1), tension control device (2), cord arrangement device (3), adhesive coating device (4) and storage device (5) are arranged in sequence. The cord opening device (1) is used to unwind several cords and pass them sequentially through the tension control device (2), the cord arrangement device (3), the adhesive coating device (4) and the storage device (5). The coating device (4) includes a rubber extruder (42) and a coating die (41). The coating die (41) includes an inlet template (411), a die body (412), and an outlet template (413) connected in sequence. The inlet template (411) has a plurality of inlet holes (4111) for the cord to pass through. The die body (412) has a forming channel (4121) inside. The outlet template (413) has a forming outlet (4131). The inlet holes (4111), the forming channel (4121), and the forming outlet (4131) are connected in sequence. The rubber extruder (42) is connected to the die body (412), and the die body (412) has a rubber injection channel (4122). One end of the rubber injection channel (4122) is connected to the forming channel (4121), and the other end is connected to the rubber extruder (42).

2. The equipment for processing coated cord layers according to claim 1, characterized in that, The cord arrangement device (3) includes a cord comb (31), which includes a comb base (311) and a plurality of cord teeth (312). The comb base (311) is horizontally arranged, and the plurality of cord teeth (312) are arranged sequentially at intervals along the length direction of the comb base (311). Adjacent cord teeth (312) are spaced apart to form a cord routing groove (313). The cord routing groove (313) is arranged in a one-to-one correspondence with the cord inlet hole (4111). The cord routing groove (313) is used to pass the cord through.

3. The equipment for processing coated cord layers according to claim 2, characterized in that, The cord arrangement device (3) further includes a limiting strip (32), which is arranged parallel to and spaced apart from the comb seat (311), and the dividing teeth (312) are located on the side of the comb seat (311) facing the limiting strip (32). The limiting strip (32) is detachably connected to a plurality of the dividing teeth (312).

4. The equipment for processing coated cord layers according to claim 2, characterized in that, The dividing teeth (312) slide in cooperation with the comb base (311) along the length direction of the comb base (311); A plurality of spacing adjustment plates (315) are provided between two adjacent dividing teeth (312). The thickness direction of the spacing adjustment plate (315) is arranged along the length direction of the comb seat (311), and the spacing adjustment plate (315) slides with the comb seat (311) along its own thickness direction. Both ends of the comb base (311) are detachably connected to abutment seats (316). Several of the dividing teeth (312) are located between two abutment seats (316) along the length direction of the comb base (311). A handwheel screw (317) is provided between the abutment seat (316) and the adjacent dividing tooth (312). The handwheel screw (317) is axially arranged along the length direction of the comb base (311). The handwheel screw (317) is screwed to the abutment seat (316), and one end of the handwheel screw (317) abuts against the corresponding dividing tooth (312).

5. The equipment for processing coated cord layers according to claim 4, characterized in that, The upper surface of the comb holder (311) is provided with a sliding guide rail (318), and the length direction of the sliding guide rail (318) is arranged along the length direction of the comb holder (311). The dividing tooth (312), the spacing adjustment plate (315), and the abutment seat (316) are all provided with dovetail grooves (319). The dovetail grooves (319) pass through the corresponding dividing tooth (312), the spacing adjustment plate (315), or the abutment seat (316) along the length direction of the sliding guide rail (318). The sliding guide rail (318) is inserted into the dovetail grooves (319). A locking bolt (320) is also screwed onto the abutment seat (316), and one end of the locking bolt (320) abuts against the sliding guide rail (318).

6. The equipment for processing coated cord layers according to claim 4, characterized in that, The wire inlet hole (4111) is elongated and its length direction is along the length direction of the comb seat (311). Several wire inlet holes (4111) are connected in sequence along their own length direction to form a wire threading hole (4112). The wire entry template (411) is provided with an adapter wire threading plate (414) on the side away from the mold body (412). The adapter wire threading plate (414) is detachably connected to the wire entry template (411) and closes the wire threading hole (4112). The adapter threading plate (414) has a plurality of threading holes (4141) for the cord to pass through, and the threading holes (4141) are connected to the threading holes (4112).

7. The equipment for processing coated cord layers according to claim 6, characterized in that, The adapter board (414) includes a base plate (4142), on which a mounting groove (4143) is formed, and the mounting groove (4143) passes through the base plate (4142) along the length direction of the base plate (4142). The substrate (4142) is provided with a plurality of wire-passing modules (4144), which are inserted into the mounting groove (4143) and slide along the length of the mounting groove (4143) with the substrate (4142); the wire-passing modules (4144) are provided in a one-to-one correspondence with the wire inlet holes (4111), and the wire inlets (4141) are opened through the corresponding wire-passing modules (4144); A plurality of thin plates (4145) are provided between two adjacent threading modules (4144). The thickness direction of the thin plates (4145) is arranged along the length direction of the mounting groove (4143). The thin plates (4145) are located in the mounting groove (4143), and the thin plates (4145) slide in cooperation with the substrate (4142) along their own thickness direction. The substrate (4142) is detachably connected to two limiting seats (4146) at both ends along its length. A plurality of threading modules (4144) are located between two limiting seats (4146) along the length of the substrate (4142). An abutting screw (4147) is provided between the limiting seat (4146) and the adjacent threading module (4144). The abutting screw (4147) is axially arranged along the length of the substrate (4142). The abutting screw (4147) is screwed to the limiting seat (4146), and one end of the abutting screw (4147) abuts against the corresponding threading module (4144).

8. A manufacturing process for an air spring airbag, utilizing the adhesive-coated cord layer processing equipment described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Prepare the inner adhesive layer, the outer adhesive layer, and the adhesive-coated cord layer; S2. The inner rubber layer is wound on the forming mandrel of the corresponding winding equipment. After the coated cord layer is output from the coated cord layer processing equipment, the coated cord layer is rotated and attached to the outside of the inner rubber layer, and then the outer rubber layer is wound in a rotating manner to form a blastocyst. S3. Post-process the blastocyst to form the final airbag product.

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