Air spring bag skin, preparation method of air spring bag skin, quality detection method of air spring bag skin and application of air spring bag skin

Abstract

The invention relates to the technical field of air springs, in particular to an air spring bag skin, a preparation method of the air spring bag skin, a quality detection method of the air spring bag skin and application of the air spring bag skin. The air spring bag skin comprises an inner rubber layer, a cord thread reinforcing layer and an outer rubber layer which are sequentially compounded from inside to outside, the cord thread reinforcing layer comprises a fiber reinforcing framework composed of cord threads; the surface of the cord thread is covered with a gum dipping layer, and a fluorescent agent is dispersed in the gum dipping layer. According to the air spring bag skin, the quality of the air spring bag skin can be rapidly detected on the premise that the structure of the air spring bag skin is not damaged.

Description

Technical Field

[0001] This invention relates to the field of air spring technology, and more specifically, to an air spring bladder and its preparation method, a quality inspection method for the air spring bladder, and its application. Background Technology

[0002] An air spring is an elastic element that utilizes the reaction force of compressed air within a sealed air chamber as its restoring force. It is widely used in automotive suspensions, industrial machinery, and rail transportation to provide shock absorption and vibration isolation. Its core component is a flexible sheath composed of rubber and a cord skeleton. The cord skeleton, woven or wound from high-strength synthetic fibers (such as polyester, nylon, and aramid), is a key structure for bearing the internal air pressure load. The cords undergo an impregnation process to form an adhesive layer, ensuring thorough adhesion between the cord surface and the rubber. The quality of the impregnation, including the degree of wetting of the cords by the impregnating solution, the uniformity of the adhesive distribution, and the presence of defects such as insufficient adhesive or air bubbles, directly determines the bonding strength (adhesion) between the cords and rubber. Furthermore, the cord skeleton layer is formed through weaving or winding; the uniformity and correctness of the cord arrangement directly affect the fatigue life, durability, and safety of the air spring.

[0003] Currently, the testing of cord impregnation quality and cord arrangement uniformity mainly relies on test strip testing and destructive sampling testing of finished products, for example: 1. Specimen Extraction Test (H): A single impregnated cord specimen is extracted from the rubber sample block. The required force and extraction pattern are measured to evaluate the adhesive strength. This method is a test specimen test and cannot provide 100% inspection of the finished product; it only reflects the performance of the test specimen.

[0004] 2. Scanning electron microscopy (SEM) observation of finished product sections: After the finished capsule skin is cut and sputter-coated with gold, the cross-sectional morphology of the resin impregnation layer is observed under SEM. This method is destructive, involves complex sample preparation, and can only observe a limited cross-section, making it difficult to comprehensively assess the resin impregnation state of the entire product.

[0005] 3. Finished Product Peeling Observation: After cutting and peeling the surface rubber of the finished shell, observe the peeling pattern to assess the bonding strength, and observe the cord gaps, angles, and quantities to evaluate the uniformity and correctness of the cord arrangement. This method is also destructive and makes it difficult to assess the impregnation and arrangement of the cords in all products.

[0006] Currently, existing technologies cannot achieve online, non-destructive, and comprehensive monitoring of the quality of the impregnation process and the arrangement of the cords in the semi-finished shell, which may lead to potentially defective products entering the market and causing quality risks.

[0007] In view of this, the present invention is hereby proposed. Summary of the Invention

[0008] The purpose of this invention is to provide an air spring bladder and its preparation method, a quality inspection method for the air spring bladder, and its application. The air spring bladder can be rapidly inspected for quality without damaging its structure.

[0009] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: Another aspect of the present invention relates to an air spring bladder, comprising an inner adhesive layer, a cord reinforcement layer and an outer adhesive layer sequentially laminated from the inside out; The cord reinforcement layer includes: a fiber-reinforced skeleton composed of cords; The surface of the cord is covered with an impregnation layer, in which a fluorescent agent is dispersed.

[0010] The aforementioned air spring bladder can be rapidly tested for quality without damaging its structure.

[0011] Another aspect of the present invention relates to a method for preparing the aforementioned air spring bladder, comprising the following steps: (a) The cord is immersed in a sizing solution containing a fluorescent agent for sizing and drying to obtain a sizing cord; (b) The impregnated cord is made into a fiber-reinforced skeleton using a fiber laying process; (c) The inner adhesive layer, the fiber-reinforced skeleton and the outer adhesive layer are combined and then subjected to vulcanization treatment.

[0012] The method for preparing the air spring bladder is simple, easy to implement, and has low preparation cost.

[0013] Another aspect of the present invention relates to an air spring, comprising the air spring skin described above or an air spring skin prepared by the method for preparing the air spring skin described above.

[0014] Another aspect of the present invention relates to a quality inspection method for air spring bladder skin, applicable to the air spring bladder skin described above or the air spring bladder skin prepared by the aforementioned method, comprising the following steps: (a) Illuminate the cord reinforcement layer region of the air spring sheath with a light source to excite the fluorescent agent in the cord impregnation layer to produce fluorescence; (b) Acquire the fluorescence pattern generated in the irradiated area; (c) The quality of the cord reinforcement layer is evaluated by analyzing the characteristics of the fluorescent pattern and comparing it with the acceptance criteria.

[0015] The aforementioned quality inspection method for air spring bladders enables non-destructive, full-coverage online inspection of air spring bladders. This method significantly improves inspection efficiency and accuracy through intuitive defect visualization, and allows for real-time monitoring of the process, thereby improving product quality from the source.

[0016] Another aspect of the present invention relates to a method for quality testing of an air spring, including the aforementioned method for quality testing of the air spring bladder.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The air spring skin provided by the present invention has a fluorescent agent dispersed in the impregnation layer of the cord. The fluorescent agent can emit visible fluorescence under ultraviolet light. Without damaging the structure of the air spring skin, the quality of the cord reinforcement layer of the air spring skin can be judged by the fluorescent pattern, which is beneficial to improving the speed and accuracy of air spring skin quality detection.

[0018] (2) The method for preparing the air spring bladder skin provided by this invention seamlessly integrates the addition of fluorescent agents into the existing standard impregnation process, rather than introducing complex and expensive new production steps. This method is simple in process and easy to implement on existing production lines, significantly reducing the cost and barriers to technological upgrades. It provides a reliable path for efficient, stable, and industrially scalable mass production of the aforementioned inventive product.

[0019] (3) The quality inspection method for air spring bladders provided by the present invention can achieve comprehensive inspection without damaging the product structure, and can monitor the finished product in real time with 100% accuracy; defects are visualized and the inspection results are clear at a glance, which improves the efficiency and accuracy of inspection and reduces the reliance on human judgment; the technology can be integrated into the production line to realize real-time monitoring and feedback of the impregnation process, and adjust the process parameters in a timely manner to improve product quality from the source; by effectively eliminating products with poor impregnation, uneven cord arrangement, incorrect cord angle, and incorrect cord quantity, the overall fatigue life and reliability of the air spring are significantly improved, and the risk of failure is reduced. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram illustrating the good fluorescence effect of the impregnated curtain under ultraviolet light irradiation; Figure 2This is a schematic diagram of the fluorescence effect of a curtain with poor impregnation (insufficient adhesive) under ultraviolet irradiation; Figure 3 A schematic diagram of the fluorescence effect of well-arranged curtains under ultraviolet light irradiation; Figure 4 This is a schematic diagram of the fluorescence effect of a missing line in a curtain under ultraviolet light. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0023] One aspect of the present invention also relates to an air spring bladder, comprising an inner adhesive layer, a cord reinforcement layer and an outer adhesive layer sequentially laminated from the inside out; The cord reinforcement layer includes: a fiber-reinforced skeleton composed of cords; The surface of the cord is covered with an impregnation layer, in which a fluorescent agent is dispersed.

[0024] This invention is the first to propose a technical solution for dispersing fluorescent agents in the cord impregnation layer of an air spring bladder. By deeply integrating detection functionality with the product's key load-bearing structure, it creates an intelligent bladder product with "self-tracing" characteristics. This fundamentally changes the traditional quality assessment model that relies on destructive sampling, laying the material foundation for online, non-destructive, and comprehensive quality inspection. This ingenious structural design does not significantly alter the original product's mechanical properties or manufacturing process complexity, yet it endows the product with unprecedented quality visualization capabilities.

[0025] Furthermore, the fluorescent agent emits visible fluorescence under illumination by a light source. This visible light emission ensures high contrast and recognizability of the detection signal, while also guaranteeing that the product's appearance remains unaffected by normal lighting conditions.

[0026] Furthermore, the light source includes, but is not limited to, ultraviolet light with a wavelength of 300~380nm. Emitting visible light under ultraviolet light of a certain wavelength ensures that the detection signal is strong enough to be clearly captured by the naked eye or equipment.

[0027] Furthermore, the fluorescent agent is colorless or light-colored under visible light, and the fluorescent agent includes, but is not limited to, organic fluorescent agents and / or inorganic fluorescent agents. Fluorescent agents with good dispersibility and excellent heat resistance to withstand the high temperatures of rubber vulcanization can be used to implement the technical solution of this invention. No specific limitation is made on the type of fluorescent agent; its excellent system compatibility ensures long-term stability without migration or precipitation.

[0028] Furthermore, the impregnated layer is mainly prepared from an impregnating solution; the mass of the fluorescent agent is 0.01% to 5.0% of the mass of the impregnating solution, including but not limited to point values ​​or ranges between any one of 0.01%, 0.05%, 0.1%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, or 5.0%. This ratio ensures a noticeable fluorescent effect after irradiation by a light source without negatively impacting the physical and mechanical properties and adhesive properties of the adhesive.

[0029] Furthermore, the mass of the fluorescent agent is 0.1% to 1.0% of the mass of the impregnation solution.

[0030] Another aspect of the present invention relates to a method for preparing the aforementioned air spring bladder, comprising the following steps: (a) The cord is immersed in a sizing solution containing a fluorescent agent for sizing and drying to obtain a sizing cord; (b) The impregnated cord is made into a fiber-reinforced skeleton using a fiber laying process; (c) The inner adhesive layer, the fiber-reinforced skeleton and the outer adhesive layer are combined and then subjected to vulcanization treatment.

[0031] The method for preparing the air spring bladder seamlessly integrates the addition of fluorescent agents into the existing standard impregnation process, rather than introducing complex and expensive new production steps. This method is simple, easy to implement on existing production lines, and significantly reduces the cost and barriers to technology upgrades. It provides a reliable path for efficient, stable, and industrially scalable mass production of this innovative product.

[0032] Further, the mass of the fluorescent agent is 0.01% to 5.0% of the mass of the impregnation solution, including but not limited to point values ​​or ranges between any one of 0.01%, 0.05%, 0.1%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, or 5.0%.

[0033] Furthermore, the temperature of the vulcanization treatment is 155~165℃, including but not limited to any one of 155℃, 157℃, 159℃, 161℃, 163℃ or 165℃ or any range between two of them.

[0034] Furthermore, the vulcanization treatment time is 10 to 20 minutes, including but not limited to any one of 10 minutes, 12 minutes, 14 minutes, 16 minutes, 18 minutes or 20 minutes, or any range between two of them.

[0035] Furthermore, in preparing the impregnation solution, the fluorescent agent and diluent are mixed to form a fluorescent solution, and the fluorescent solution and the remaining components of the impregnation solution are mixed evenly. When the fluorescent agent is a solid powder or a viscous liquid, it is easy to cause uneven dispersion when directly mixed into the viscous impregnation solution, and it needs to be dispersed evenly with a diluent first.

[0036] The present invention achieves the corresponding technical effects by adding fluorescent agents to conventional impregnation solutions in the art. Furthermore, the remaining components of the impregnation solution include at least one of carbon black, rubber, or adhesive.

[0037] This invention does not specifically limit the type of diluent; any diluent conventional in the art can be used to implement the technical solutions of this invention. In some preferred embodiments, the diluent includes, but is not limited to, at least one of toluene, xylene, methyl ethyl ketone (MEK), or acetone.

[0038] Another aspect of the present invention relates to an air spring, comprising the air spring skin described above or an air spring skin prepared by the method for preparing the air spring skin described above.

[0039] Another aspect of the present invention relates to a quality inspection method for air spring bladder skin, applicable to the air spring bladder skin described above or the air spring bladder skin prepared by the aforementioned method, comprising the following steps: (a) Illuminate the cord reinforcement layer region of the air spring sheath with a light source to excite the fluorescent agent in the cord impregnation layer to produce fluorescence; (b) Acquire the fluorescence pattern generated in the irradiated area; (c) The quality of the cord reinforcement layer is evaluated by analyzing the characteristics of the fluorescent pattern and comparing it with the acceptance criteria.

[0040] The aforementioned method for quality testing of air spring bladder skin has the following advantages: 1. Non-destructive testing: Comprehensive testing can be achieved without damaging the product structure, and 100% real-time monitoring of finished products can be performed.

[0041] 2. Intuitive and efficient: Defects are visualized, and the detection results are clear at a glance, which greatly improves detection efficiency and accuracy and reduces reliance on human judgment.

[0042] 3. Online monitoring: This technology can be integrated into the production line to achieve real-time monitoring and feedback of the dipping process, allowing for timely adjustment of process parameters and improving product quality from the source.

[0043] 4. Improve quality and reliability: By effectively eliminating products with poor impregnation, uneven cord arrangement, incorrect cord angle, or incorrect cord quantity, the overall fatigue life and reliability of the air spring are significantly improved, and the risk of failure is reduced.

[0044] 5. Cost-effectiveness: The amount of fluorescent agent added is small and the cost is low, but the resulting improvement in quality and reduction in risk are huge benefits.

[0045] The aforementioned method for quality inspection of air spring bladder covers involves irradiating the cord with ultraviolet light and observing whether the emitted fluorescent pattern is uniform, continuous, and undamaged. This allows for a rapid assessment of the wetting and coating quality of the adhesive on the cord, thereby identifying defects such as insufficient adhesive or air bubbles. Similarly, when weaving or winding the cord, ultraviolet light is used to irradiate the cord, and the spacing, angle, and quantity of the fluorescent lines are observed to determine whether the cord arrangement is uniform and correct.

[0046] This invention is the first to achieve efficient, intuitive, online, and non-destructive evaluation of the core quality indicator of air springs—the quality and distribution of the cord impregnation. It breaks through the limitations of traditional destructive sampling inspection and provides a breakthrough means for product quality control and reliability improvement.

[0047] The light source of this invention is not limited to a certain light source; any light source that can produce visible fluorescence when irradiating the fluorescent agent can achieve the technical solution of this invention. In some specific embodiments, the light source includes, but is not limited to, ultraviolet light with a wavelength of 300~380nm (for example, it can be any point value or any range between 300nm, 310nm, 320nm, 330nm, 340nm, 350nm, 365nm, 375nm or 380nm).

[0048] Furthermore, the evaluation of the quality of the cord reinforcement layer includes an evaluation of the quality of the cord impregnation layer: If the fluorescence brightness of the fluorescent patterns is consistent, the quality of the impregnation layer is deemed to be qualified. If the fluorescence brightness of the fluorescent pattern is inconsistent, the quality of the impregnation layer is deemed unqualified.

[0049] The quality of the impregnation layer can be judged by the brightness, uniformity, and continuity of the fluorescent pattern: a uniform and bright fluorescent pattern indicates good impregnation and uniform distribution of the adhesive; dim, uneven, or dark areas with interrupted fluorescence indicate defects such as insufficient adhesive, poor wetting, bubbles, or contamination in that area.

[0050] Furthermore, the evaluation of the quality of the cord reinforcement layer includes an evaluation of the quality of cord installation: If the fluorescent pattern meets all of the following (1) to (4), then the quality of the curtain laying is deemed to be qualified; (1) The gap between two adjacent fluorescent lines on the fluorescent pattern is 0.01~2mm, including but not limited to the point value of any one of 0.01mm, 0.05mm, 0.1mm, 0.5mm, 1mm, 1.5mm or 2mm or the range value between any two of them; (2) The acute angle between the fluorescent line on the fluorescent pattern and the central axis is 0°~45°, including but not limited to any one of 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45° or any range between two of them; (3) The number of fluorescent lines on the fluorescent pattern is 200 to 1000, including but not limited to any one of 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950 or 1000 points or any range between two. (4) There are no overlapping fluorescent lines on the fluorescent pattern; If the fluorescent pattern does not conform to any of the above (1) to (4), the quality of the curtain laying is deemed unqualified.

[0051] The uniformity and correctness of the cord arrangement in the capsule skin can be judged by the gap, angle and number of fluorescent lines: if the gap between two adjacent fluorescent lines is uniform, there are no missing lines, no overlap, the angle is correct and the number is correct, it indicates that the cord distribution in the capsule skin is uniform and correct; if the gap between fluorescent lines is large, there is overlap, the angle is wrong and the number is wrong, it indicates that the cord distribution in the capsule skin is uneven and the arrangement is wrong.

[0052] Another aspect of the present invention relates to a method for quality testing of an air spring, including the aforementioned method for quality testing of the air spring bladder.

[0053] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0054] Example 1 The method for preparing the air spring bladder skin provided in this embodiment includes the following steps: 1. Preparation of fluorescent solution: Mix the fluorescent agent that emits green light under 365nm ultraviolet light with toluene until homogeneous; 2. Preparation of impregnation solution: The mass of fluorescent agent is 0.1% of the mass of impregnation solution. Mix the fluorescent solution and impregnation solution thoroughly. 3. Cord impregnation: The impregnation solution obtained in step 2 is used to impregnate the surface of the cord using an impregnation equipment and then dried. 4. Shell molding and vulcanization: The rubber-impregnated cord is woven or wound onto the compound rubber according to the design requirements, and then placed in a mold for vulcanization at a temperature of 160℃ for 15 minutes to obtain the finished shell.

[0055] Example 2 The method for preparing the air spring bladder skin provided in this embodiment includes the following steps: 1. Preparation of fluorescent solution: Mix the fluorescent agent with toluene until homogeneous; 2. Preparation of impregnation solution: The mass of fluorescent agent is 0.01% of the mass of impregnation solution. Mix the fluorescent solution and impregnation solution thoroughly. 3. Cord impregnation: The impregnation solution obtained in step 2 is used to impregnate the surface of the cord using an impregnation equipment and then dried. 4. Shell molding and vulcanization: The rubber-impregnated cord is woven or wound onto the compound rubber according to the design requirements, and then placed in a mold for vulcanization at a temperature of 155℃ for 20 minutes to obtain the finished shell.

[0056] Example 3 The method for preparing the air spring bladder skin provided in this embodiment includes the following steps: 1. Preparation of fluorescent solution: Mix the fluorescent agent with toluene until homogeneous; 2. Preparation of impregnation solution: The mass of fluorescent agent is 5.0% of the mass of impregnation solution. Mix the fluorescent solution and impregnation solution thoroughly. 3. Cord impregnation: The impregnation solution obtained in step 2 is used to impregnate the surface of the cord using an impregnation equipment and then dried. 4. Shell molding and vulcanization: The rubber-impregnated cord is woven or wound onto the compound rubber according to the design requirements, and then placed in a mold for vulcanization at a temperature of 165℃ for 10 minutes to obtain the finished shell.

[0057] Example 4 The air spring bladder quality inspection method provided in this embodiment includes the following steps: 1. Irradiate the cord reinforcement layer region of the air spring bladder skin of Example 1 with ultraviolet light of wavelength 365nm to excite the fluorescent agent in the cord impregnation layer to produce fluorescence; 2. Obtain the fluorescence pattern generated in the irradiated area; 3. The quality of the cord reinforcement layer is evaluated by analyzing the characteristics of the fluorescent pattern and comparing it with the qualification standard. 4. Evaluate the quality of the cord impregnation layer: If the fluorescence brightness of the fluorescent pattern is consistent, the quality of the impregnation layer is deemed to be qualified; if the fluorescence brightness of the fluorescent pattern is inconsistent, the quality of the impregnation layer is deemed to be unqualified. like Figure 1 As shown, under ultraviolet excitation, well-impregnated cords emit uniform and bright green fluorescence with consistent fluorescence intensity, indicating that the impregnation solution has fully and uniformly impregnated and coated the cords, and the quality of the impregnation layer is qualified. like Figure 2 As shown, under ultraviolet excitation, the fluorescence brightness is significantly darkened or black lines without fluorescence are observed on a certain section or a certain cord, indicating that there is a defect of insufficient glue or poor wetting at that location, and the quality of the glue layer is unqualified. 5. Evaluate the quality of the curtain laying: If the fluorescent pattern meets all of the following items (1) to (4), the quality of the curtain laying is deemed to be qualified; (1) The gap between two adjacent fluorescent lines on the fluorescent pattern is 0.01~2mm; (2) The acute angle between the fluorescent line on the fluorescent pattern and the central axis is 0°~45°; (3) The number of fluorescent lines on the fluorescent pattern is 200 to 1000; (4) There are no overlapping fluorescent lines on the fluorescent pattern; If the fluorescent pattern does not conform to any of the above (1) to (4), the quality of the curtain laying is deemed unqualified; like Figure 3 As shown, under ultraviolet excitation, the fluorescent cords were observed to be evenly distributed on the woven shell semi-finished product, emitting bright green fluorescence, which conforms to all items in (1) to (4), indicating that the cords are evenly distributed.

[0058] like Figure 4 As shown, under ultraviolet excitation, black gaps without fluorescence were observed on the woven shell semi-finished product. If the gap between two adjacent fluorescent lines is greater than 2 mm, it indicates that the shell semi-finished product has a defect in the distribution of missing cord threads.

[0059] By using this simple and rapid ultraviolet light irradiation, quality inspectors can immediately identify problematic areas, thereby achieving effective control over product quality.

[0060] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. An air spring bladder, characterized in that, It includes an inner adhesive layer, a cord reinforcement layer, and an outer adhesive layer, which are sequentially laminated from the inside out; The cord reinforcement layer includes: a fiber-reinforced skeleton composed of cords; The surface of the cord is covered with an impregnation layer, in which a fluorescent agent is dispersed.

2. The air spring bladder according to claim 1, characterized in that, The fluorescent agent emits visible fluorescence when irradiated by a light source; And / or, the impregnation layer is mainly prepared from an impregnation solution; the mass of the fluorescent agent is 0.01% to 5.0% of the mass of the impregnation solution.

3. The method for preparing the air spring bladder skin as described in claim 1 or 2, characterized in that, Includes the following steps: (a) The cord is immersed in a sizing solution containing a fluorescent agent for sizing and drying to obtain a sizing cord; (b) The impregnated cord is made into a fiber-reinforced skeleton using a fiber laying process; (c) The inner adhesive layer, the fiber-reinforced skeleton and the outer adhesive layer are combined and then subjected to vulcanization treatment.

4. The method for preparing the air spring bladder according to claim 3, characterized in that, The mass of the fluorescent agent is 0.01% to 5.0% of the mass of the impregnation solution.

5. The method for preparing the air spring bladder according to claim 3, characterized in that, The vulcanization treatment temperature is 155~165℃; And / or, the vulcanization treatment time is 10~20 min.

6. An air spring, characterized in that, The air spring bladder includes the air spring bladder as described in claim 1 or 2, or the air spring bladder prepared by the method described in any one of claims 3 to 5.

7. A quality inspection method for air spring bladders, applicable to air spring bladders prepared by the method described in claim 1 or 2, or by the method described in any one of claims 3 to 5, characterized in that, Includes the following steps: (a) Illuminate the cord reinforcement layer region of the air spring sheath with a light source to excite the fluorescent agent in the cord impregnation layer to produce fluorescence; (b) Acquire the fluorescence pattern generated in the irradiated area; (c) The quality of the cord reinforcement layer is evaluated by analyzing the characteristics of the fluorescent pattern and comparing it with the acceptance criteria.

8. The method for quality inspection of air spring bladder skin according to claim 7, characterized in that, The evaluation of the quality of the cord reinforcement layer includes the evaluation of the quality of the cord impregnation layer: If the fluorescence brightness of the fluorescent patterns is consistent, the quality of the impregnation layer is deemed to be qualified. If the fluorescence brightness of the fluorescent pattern is inconsistent, the quality of the impregnation layer is deemed unqualified.

9. The method for quality inspection of air spring bladder skin according to claim 7, characterized in that, The evaluation of the quality of the cord reinforcement layer includes an evaluation of the quality of cord installation: If the fluorescent pattern meets all of the following (1) to (4), then the quality of the curtain laying is deemed to be qualified; (1) The gap between two adjacent fluorescent lines on the fluorescent pattern is 0.01~2mm; (2) The acute angle between the fluorescent line on the fluorescent pattern and the central axis is 0°~45°; (3) The number of fluorescent lines on the fluorescent pattern is 200 to 1000, based on one ring of the air spring bladder. (4) There are no overlapping fluorescent lines on the fluorescent pattern; If the fluorescent pattern does not conform to any of the above (1) to (4), the quality of the curtain laying is deemed unqualified.

10. A method for quality inspection of an air spring, characterized in that, The method for quality testing of air spring bladder as described in any one of claims 6 to 9.

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