Preparation method, mold, and air spring of the air spring's bladder assembly

Abstract

This invention provides a method for preparing an air spring bladder assembly, a mold, and an air spring. The method for preparing the air spring bladder assembly includes the following steps: adhesive coating, material feeding, inner bladder expansion, thermal bonding, pressure holding and cooling, and inner bladder recovery and demolding. Adhesive is coated on the inner surface of the clamping ring. The clamping ring is placed at the positioning surface of the main mold fixture, so that the bottom surface of the bladder contacts and is positioned with the upper plane of the lower seat. Inflation is performed through the inflation pipe at the bottom of the expanding inner bladder fixture. The rubber-cord composite fabric of the inner mesh expands under the internal air pressure and contacts the bladder, causing the bladder to expand until the outer surface of the bladder is bonded to the inner surface of the main mold fixture and the inner surface of the clamping ring, achieving thermal bonding. After pressure holding and cooling, the inner bladder recovers and is demolded. By using the internal inflation of the expanding inner bladder fixture to achieve bonding between the bladder and the clamping ring, the limitations of existing air spring manufacturing techniques are solved.

Description

Technical Field

[0001] This invention relates to the field of air spring bladder assembly technology, and more specifically, to a method for preparing an air spring bladder assembly, a mold, and an air spring. Background Technology

[0002] In recent years, air springs have gradually become more widely used in automotive suspensions. An air spring is a cylindrical bladder that can enclose gas, formed by assembling a rubber bladder with a clamping ring and other fitting parts. The existing manufacturing process has the following problems: (1) Due to the limitation of the bladder diameter, large-diameter air springs cannot be manufactured; (2) Inaccurate positioning of the bladder and related clamping fitting parts leads to variations in air spring quality; (3) Some structural designs lack constraints on the outer diameter of the bladder, resulting in limited air spring performance.

[0003] Faced with these problems, the industry is currently unable to prevent them from occurring and can only resort to compromise or avoidance to deal with them. For example: (1) Large-diameter air springs cannot be manufactured, so the design requirements for the diameter of the air spring are reduced; (2) The positioning of the air spring and the mating parts is inaccurate during mass production, so the only way to avoid unqualified products from entering the market is to add testing methods later; (3) When the outer diameter of the air spring lacks restraint, the only way to meet the restraint requirements of the air spring is to add auxiliary positioning components or reduce the axial length of the exposed part, which leads to a significant increase in the complexity of the structure or a significant increase in torsional stiffness. Summary of the Invention

[0004] The main objective of this invention is to provide a method for preparing the bladder assembly of an air spring, a mold, and an air spring, so as to solve the problem of limited air spring preparation technology in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a method for preparing an air spring bladder assembly is provided, comprising the following steps: adhesive coating: applying adhesive to the inner surface of a clamping ring; material feeding: inserting at least one clamping ring into a main mold fixture to place the clamping ring at the positioning surface of the main mold fixture; inserting a bladder outer shell outside an inflatable inner bladder fixture, with the bottom surface of the bladder outer shell contacting and positioning the upper plane of the lower seat; inner bladder inflation: inflating the interior of the inner bladder fixture through an inflation pipe at the bottom of the inflatable inner bladder fixture, wherein the inner mesh of the inner bladder fixture is inflated. After the adhesive-cord composite fabric expands under internal air pressure, it comes into contact with the bladder and causes the bladder to expand until the outer surface of the bladder is attached to the inner surface of the main mold fixture, and the outer surface of the bladder is attached to the inner surface of the clamping ring, at which point inflation stops; thermal bonding: the main mold fixture is heated by a heating component to transfer heat to the clamping ring; pressure holding and cooling: the gas pressure inside the expanded inner bladder fixture is maintained for a preset time to air-cool the main mold fixture; inner bladder recovery and demolding: the gas inside the expanded inner bladder fixture is expelled, and the bladder sample with the clamping ring is removed to obtain the bladder assembly.

[0006] Furthermore, in the material delivery step, two clamping rings are inserted into the main mold fixture, and the two clamping rings are placed at intervals along the height direction of the main mold fixture on the positioning surface of the main mold fixture.

[0007] Furthermore, the thermal bonding step includes: controlling the heating of the main mold tooling until the temperature of the contact surface between the clamping ring and the bladder reaches T1, wherein T1 ≥ 100℃.

[0008] Furthermore, the thermal bonding step includes: after detecting that the temperature of the contact surface between the clamping ring and the bladder reaches T1, maintaining the heating assembly to heat the main mold tooling.

[0009] Furthermore, the duration for which the heating component heats the main mold tooling is H1, where H1 ≥ 10 min.

[0010] Furthermore, in the pressure holding and cooling step, the preset time for maintaining the gas pressure inside the expansion inner bladder tooling is H2, wherein H2 ≥ 30 min.

[0011] Furthermore, the pressure holding and cooling step also includes: while maintaining the gas pressure inside the expansion inner bladder tooling, controlling the temperature at which the heating components heat the main mold tooling, so as to reduce the temperature of the main mold tooling.

[0012] Furthermore, the pressure holding and cooling step also includes: controlling the temperature of the heating component on the main mold tooling to decrease to T2, wherein T2≤50℃.

[0013] According to another aspect of the present invention, an air spring is provided, including a bladder assembly, the bladder assembly being obtained by the method for preparing the bladder assembly of the air spring described above.

[0014] According to another aspect of the present invention, a mold is provided for processing the aforementioned bladder assembly. The mold includes: a lower seat having a bladder positioning surface; an inner bladder, one end of which is connected to the lower seat, and the other end of which is provided with a plug; the bladder positioning surface being arranged circumferentially along the inner bladder; a first air passage communicating with the inner cavity of the inner bladder being provided at the bottom of the lower seat; the inner bladder being used to place the bladder to be bonded to a clamping ring; and a main mold fixture being arranged circumferentially along the inner bladder, and at least one positioning surface being provided on the inner circular surface of the main mold fixture for placing the clamping ring; a heating component and a second air passage being provided inside the main mold fixture; wherein, by introducing gas at a preset pressure into the first air passage, the inner bladder can move the bladder to the inner circular surface of the main mold fixture, so that a portion of the outer surface of the bladder contacts the inner surface of the clamping ring, and another portion of the outer surface of the bladder contacts the inner circular surface of the main mold fixture.

[0015] By applying the technical solution of this invention, the diameter of the bladder port is expanded to match the size of the clamping ring during the initial assembly stage through the application of the outer ring bonding process, thus achieving precise positioning of the bladder and the clamping ring. At the same time, the outer diameter of the bladder is limited, which solves the problem of limited air spring manufacturing technology in the prior art. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic flowchart of an embodiment of a method for preparing an air spring bladder assembly according to the present invention is shown;

[0018] Figure 2 A schematic diagram of an embodiment of a mold for preparing a method for preparing an air spring bladder assembly according to the present invention is shown;

[0019] Figure 3 A schematic diagram of the structure of a first embodiment of a method for preparing an air spring bladder assembly according to the present invention is shown;

[0020] Figure 4 A schematic diagram of a second embodiment of a method for preparing an air spring bladder assembly according to the present invention is shown;

[0021] Figure 5 A schematic diagram of an embodiment of the bladder assembly of an air spring according to the present invention is shown;

[0022] Figure 6 A schematic diagram of a third embodiment of the method for preparing the bladder assembly of an air spring according to the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Lower seat; 11. Skin positioning surface; 12. First airway;

[0025] 20. Internal capsule;

[0026] 30. Main mold tooling; 31. Positioning surface; 32. Second air passage;

[0027] 40. Heating assembly; 41. Temperature sensor;

[0028] 50. Bud skin;

[0029] 60. Crimping ring. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0034] Combination Figures 1 to 6 As shown, according to an embodiment of the present invention, a method for preparing an air spring bladder assembly is provided.

[0035] Specifically, the preparation method of the air spring's bladder assembly includes the following steps: Adhesive coating: Applying adhesive to the inner surface of the clamping ring. Material placement: Placing at least one clamping ring in the main mold fixture to position it at the positioning surface of the main mold fixture. Placing the bladder skin outside the inflatable inner bladder fixture, with the bottom surface of the bladder skin contacting and positioning the upper plane of the lower seat. Inner bladder inflation: Inflating the inner bladder fixture through the inflation pipe at the bottom of the inflatable inner bladder fixture. The rubber-cord composite fabric of the inner mesh inside the inner bladder fixture expands under the internal air pressure, contacting the bladder skin and causing it to expand until the outer surface of the bladder skin is bonded to the inner surface of the main mold fixture, and the outer surface of the bladder skin is bonded to the inner surface of the clamping ring, after which inflation stops. Thermal bonding: Heating the main mold fixture using a heating component to transfer heat to the clamping ring. Pressure holding and cooling: Maintaining the gas pressure inside the inflatable inner bladder fixture for a preset time while air-cooling the main mold fixture. Inner bladder recovery and demolding: the gas inside the inflated inner bladder tooling is removed, and the bladder skin sample with the buckling ring is taken out to obtain the bladder skin assembly.

[0036] Combination Figures 1 to 4 As shown, in this embodiment, by applying the internal inflation of the expansion-type inner bladder tooling to drive the bladder skin and the clamping ring to achieve adhesion, the diameter of the bladder skin port is expanded to be consistent with the size of the clamping ring in the initial stage of assembly. This solves the problem of limited air spring manufacturing technology in the prior art, improves the positioning accuracy of the bladder skin and the clamping ring, and achieves the technical effect of limiting the outer diameter of the bladder skin without increasing structural complexity and structural rigidity, thus providing a more practical air spring manufacturing technology.

[0037] During the material feeding step, two clamping rings are inserted into the main mold tooling (combined with...). Figure 3 and Figure 5As shown in the diagram, two clamping rings are placed at intervals along the height direction of the main mold fixture on the positioning surface of the main mold fixture. At this time, the relative position of the expansion inner bladder fixture and the main mold fixture is fixed. The clamping rings are inserted into the main mold fixture and positioned by relying on the positioning surface in the main mold fixture. This embodiment only specifically describes the case where metal rings are used for the clamping rings. After the two clamping rings are bonded to the bladder skin, the initial inner diameter of the bladder skin can be expanded, so that the bladder skin assembly can adapt to the large-diameter upper air chamber scheme, greatly expanding the application range of the bladder skin assembly. At the same time, after the clamping rings and the bladder skin are initially positioned relative to each other, there is no need to position and fix them again in subsequent process steps, avoiding the problem that the soft bladder skin material makes it difficult to achieve accurate positioning during assembly, thus improving the practicality of the bladder skin assembly.

[0038] The thermal bonding step includes: controlling the heating of the main mold tooling until the temperature of the contact surface between the crimping ring and the bladder skin reaches T1, wherein T1 ≥ 100°C. In this embodiment, since the inner surface of the crimping ring has been coated with adhesive beforehand, the adhesive can achieve optimal results within a specific temperature range (100–120°C) below the vulcanization temperature. This setup enables good adhesion between the crimping ring and the bladder skin.

[0039] The thermal bonding step includes: after detecting that the temperature of the contact surface between the clamping ring and the bladder skin reaches T1, maintaining the heating assembly to heat the main mold fixture. This setup ensures stable bonding between the clamping ring and the bladder skin within the optimal range of the adhesive's effect.

[0040] The heating component maintains heating of the main mold tooling for a duration of H1, where H1 ≥ 10 min. In this embodiment, the heating component heats the main mold, transferring heat to the clamping ring and then to the contact surface between the clamping ring and the bladder skin, raising the contact surface temperature to 110°C and maintaining it for 10 minutes. This setup ensures that the clamping ring and the bladder skin are properly positioned relative to each other, eliminating the need for further positioning and fixing in subsequent processes. This avoids the problem of difficulty in achieving precise positioning during assembly due to the softness of the bladder skin material, thus improving the practicality of the bladder skin assembly.

[0041] The pressure holding and cooling step includes maintaining the gas pressure inside the expanding inner bladder tooling for a preset time of H2, where H2 ≥ 30 min. In this embodiment, during the pressure holding and cooling process, the gas pressure inside the expanding inner bladder tooling is maintained, and the mold is air-cooled for 30 min. This setting effectively prevents the inner bladder from shrinking, achieving ideal quality control of the inner bladder product.

[0042] The pressure-holding and cooling step also includes: while maintaining the gas pressure inside the expansion bladder fixture, controlling the temperature of the heating components on the main mold fixture to lower its temperature. This setup allows for simultaneous air cooling and temperature control of the main mold fixture, thus completing the cooling process.

[0043] The pressure-holding and cooling step also includes controlling the temperature of the heating assembly on the main mold fixture to decrease to T2, where T2 ≤ 50°C. In this embodiment, the gas pressure inside the expanding inner bladder fixture is maintained, and the mold is air-cooled for 30 minutes until the temperature drops below 50°C. During the inner bladder recovery and demolding process, the gas inside the expanding inner bladder fixture is expelled, and the fixture returns to its original size and shape. At the same time, the outer bonding ring bladder skin sample can be removed, completing the demolding process. This setup ensures that the bladder skin can complete the recovery and demolding process in optimal condition.

[0044] In another embodiment of the present invention, an air spring is also provided, including a bladder assembly, which is obtained by the method for preparing the bladder assembly of the air spring in the above embodiments. This air spring can be a large-diameter bladder air spring that cannot be manufactured in the prior art, and it has higher precision, better quality, and a higher pass rate compared to air springs produced in the prior art.

[0045] In another embodiment of the present invention, a mold is also provided for processing the bladder skin 50 assembly in the above embodiment. The mold includes a lower seat 10, an inner bladder 20, and a main mold fixture 30. The lower seat 10 has a bladder skin positioning surface 11. One end of the inner bladder 20 is connected to the lower seat 10, and the other end of the inner bladder 20 is provided with a plug 22. The bladder skin positioning surface 11 is arranged circumferentially along the inner bladder 20. The bottom of the lower seat 10 is provided with a first air passage 12 communicating with the inner cavity of the inner bladder 20. The inner bladder 20 is used to place the bladder skin 50 to be bonded to the clamping ring 60. The main mold fixture 30 is arranged circumferentially along the inner bladder 20, and the inner circular surface of the main mold fixture 30 is provided with at least one positioning surface 31 for placing the clamping ring 60. A heating component 40 and a second air passage 32 are provided inside the main mold fixture 30. In this process, introducing gas at a preset pressure into the first air passage 12 can cause the inner bladder 20 to move the bladder skin 50 to the inner circular surface of the main body mold tooling 30, so that part of the outer surface of the bladder skin 50 contacts the inner surface of the clamping ring 60, and another part of the outer surface of the bladder skin 50 contacts the inner circular surface of the main body mold tooling 30.

[0046] In the above embodiment, the main mold tooling 30 has a positioning surface 31 (combined with...). Figure 2 As shown), heating component 40 and temperature monitoring point group (in combination with) Figure 6(As shown). The width of the positioning surface 31 is slightly smaller than the thickness of the clamping ring 60 (0.8mm ± 0.1mm), ensuring that the inner side of the clamping ring 60 can protrude from the local inner surface of the main mold while positioning. In this embodiment, only the case where the heating component 40 is a ring matrix heating source is specifically described. The edge of the ring matrix heating source is 10mm away from the inner surface of the mold. The number of ring matrix heating sources is determined according to the inner diameter of the main mold. To ensure the heating rate and a small temperature fluctuation tolerance, at least 10 heating sources with a power of 20kW or more need to be evenly arranged along the axial direction. The temperature monitoring point group includes a temperature sensor 41, which is set in the main mold fixture 30 near the installation position of the clamping ring 60, and at least 4 are evenly arranged along the circumference of the main mold fixture 30. The expansion inner bladder fixture consists of a rubber-cord composite fabric, an upper plug, and a lower seat 10. The expansion inner bladder needs to ensure good airtightness and be able to support the filling of gas above 10 bar without bursting or leaking. A second air passage 32 is provided so that the inner bladder forms a negative pressure during the expansion process, preventing localized gas retention and air pocketing when the bladder skin 50 is fitted to the outer main mold fixture 30. The upper surface of the lower seat 10 of the inner bladder fixture serves as the bladder skin positioning surface 11, thereby better positioning the bladder skin. Through the technical solution of this embodiment, bladder skin 50 components with better quality and higher pass rate as described in the above embodiments can be manufactured, broadening the application range of the bladder skin 50 components.

[0047] In another embodiment of the present invention, a capsule skin with an outer ring bonding process is also provided. The capsule skin is the capsule skin in the capsule skin assembly produced in the above embodiment, and has the following application scenarios:

[0048] 1) The outer ring bonding process is applied to the upper clamping ring. After the upper clamping ring is bonded to the skin, the initial inner diameter of the skin is enlarged, which can adapt to the upper air chamber scheme with a large diameter and greatly expand the application range of the skin. At the same time, the upper clamping ring and the skin are initially positioned relative to each other, so there is no need to position and fix them in subsequent process steps. This avoids the problem that it is difficult to achieve accurate positioning during the assembly process due to the softness of the skin material.

[0049] 2) The outer ring bonding process is applied to the outer casing support ring, which eliminates the need for the inner support ring scheme and its corresponding assembly process, and avoids the problem that the precise positioning of the outer ring material is difficult to achieve during the assembly process due to its softness.

[0050] 3) The outer ring bonding process is applied to the bladder expansion limiting ring, which effectively limits the expansion diameter of the bladder and eliminates the need for other auxiliary components to position the limiting ring. In existing non-bonded solutions, the limiting ring requires an additional layer of positioning rubber sleeve to ensure its position. However, adding a rubber sleeve would cause wear between the sleeve and the bladder, making this solution impractical. This embodiment, however, allows for the implementation of this technical solution.

[0051] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0052] After bonding the outer surface of the bladder to the clamping ring, the diameter of the bladder port is expanded to match the size of the clamping ring during the initial assembly. This initial expansion of the bladder port ensures smooth assembly when adapting to a large-diameter upper air chamber, thus ensuring the feasibility of manufacturing a large-diameter air spring solution.

[0053] By bonding the clamping ring and the bladder skin in the mold in the early stage, their relative positional relationship can be accurately guaranteed. This eliminates the need for positioning and fixing during the assembly process. Moreover, since the bladder skin material is relatively soft, it is difficult to achieve precise positioning during the assembly process. Therefore, the bonding process in the mold in the early stage can effectively guarantee the assembly positioning accuracy.

[0054] By implementing this process, the air spring can be constrained at any design location without relying on other auxiliary positioning components or shortening the axial exposed length of the air spring in the design scheme. This simplifies the structure of the air spring while ensuring its performance, and solves the problem of limited air spring manufacturing technology in the prior art.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of making a bladder skin assembly for an air spring, the method comprising: The air spring's bladder assembly is prepared using a mold, the mold comprising: ​ The lower seat (10) has a skin positioning surface (11). The inner capsule (20) is connected at one end to the lower seat (10), and the other end of the inner capsule (20) is provided with a plug (22). The capsule skin positioning surface (11) is arranged along the circumference of the inner capsule (20). The bottom of the lower seat (10) is provided with a first air passage (12) communicating with the inner cavity of the inner capsule (20). The inner capsule (20) is used to place the capsule skin (50) to be bonded to the buckling ring. The main mold fixture (30) is arranged along the circumference of the inner bladder (20), and the inner circular surface of the main mold fixture (30) is provided with at least one positioning surface (31), the positioning surface (31) is used to place the buckling ring, and the main mold fixture (30) is provided with a heating component (40) and a second air passage (32). The preparation method includes the following steps: Adhesive coating: Apply adhesive to the inner surface of the crimping ring; Material placement: Insert at least one clamping ring into the main mold tooling to place the clamping ring at the positioning surface of the main mold tooling. Insert the bladder skin outside the expansion inner bladder tooling, with the bottom surface of the bladder skin contacting and positioning the upper plane of the lower seat. Inner bladder inflation: Inflate the inner bladder through the inflation tube at the bottom of the inflation inner bladder tooling. The rubber-cord composite fabric of the inner mesh inside the inner bladder tooling expands under the internal air pressure, contacts the bladder skin and drives the bladder skin to expand until the outer surface of the bladder skin is in contact with the inner surface of the main mold tooling and the outer surface of the bladder skin is in contact with the inner surface of the buckling ring, and then stop inflation. Thermal bonding: The main mold tooling is heated by a heating component to transfer heat to the clamping ring; Pressure holding and cooling: The gas pressure inside the expansion inner bladder tooling is maintained for a preset time to air cool the main mold tooling; In the process of inner bladder recovery and demolding: the gas inside the inflated inner bladder tooling is removed, and the bladder skin sample with the buckling ring is taken out to obtain the bladder skin assembly; The hot bonding step includes: controlling the heating of the main mold tooling until the temperature of the contact surface between the clamping ring and the bladder skin reaches T1, wherein T1≥100℃; The hot bonding step includes: after detecting that the temperature of the contact surface between the clamping ring and the bladder reaches T1, maintaining the heating component to heat the main mold tooling; maintaining the heating component to heat the main mold tooling for a duration of H1, wherein H1 ≥ 10 min; The pressure holding and cooling step includes: maintaining the gas pressure inside the expansion inner bladder tooling for a preset time of H2, wherein H2 ≥ 30 min.

2. The preparation method according to claim 1, characterized in that, In the material delivery step, two clamping rings are inserted into the main mold fixture, and the two clamping rings are placed at intervals along the height direction of the main mold fixture on the positioning surface of the main mold fixture.

3. The preparation method according to claim 1, characterized in that, The pressure holding and cooling process also includes: While maintaining the gas pressure inside the expansion bladder tooling, the temperature of the heating components used to heat the main mold tooling is controlled to reduce the temperature of the main mold tooling.

4. The preparation method according to claim 3, characterized in that, The pressure holding and cooling process also includes: The temperature of the main mold tooling is controlled by the heating component to be reduced to T2, where T2≤50℃.

5. An air spring comprising a bladder assembly, characterized in that, The bladder assembly is obtained by the method for preparing the bladder assembly of the air spring according to any one of claims 1 to 4.

6. A mold for processing the capsule assembly of claim 5, characterized in that, The mold includes: The lower seat (10) has a skin positioning surface (11). The inner capsule (20) is connected at one end to the lower seat (10), and the other end of the inner capsule (20) is provided with a plug (22). The capsule skin positioning surface (11) is arranged along the circumference of the inner capsule (20). The bottom of the lower seat (10) is provided with a first air passage (12) communicating with the inner cavity of the inner capsule (20). The inner capsule (20) is used to place the capsule skin (50) to be bonded to the buckling ring. The main mold fixture (30) is arranged along the circumference of the inner bladder (20), and the inner circular surface of the main mold fixture (30) is provided with at least one positioning surface (31), the positioning surface (31) is used to place the buckling ring, and the main mold fixture (30) is provided with a heating component (40) and a second air passage (32). In this process, the gas with a preset pressure is introduced into the first air passage (12) so that the inner bladder (20) can move the bladder skin (50) to the inner circular surface of the main body mold tool (30), so that part of the outer surface of the bladder skin (50) contacts the inner surface of the buckling ring, and another part of the outer surface of the bladder skin (50) contacts the inner circular surface of the main body mold tool (30).

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