Highly flexible production line for upright production of air spring sealing caps and snap ring assembly equipment

Abstract

This invention discloses a highly flexible assembly line for the upright production of air spring sealing caps and retaining rings, comprising a sealing cap assembly station and a retaining ring assembly station. The sealing cap assembly station includes a sealing cap supply device, a first lifting device, a first positioning and clamping device, and a sealing cap pressing device. The retaining ring assembly station includes a retaining ring supply device, a second lifting device, a second positioning and clamping device, and a retaining ring pressing device. The retaining ring supply device is equipped with a closing mold with a guiding structure. This invention achieves automated assembly of sealing caps and retaining rings, eliminating the risk of injury from retaining ring splashing. Precise positioning and guiding structures ensure accurate insertion of the retaining ring into the groove, improving assembly quality. The dual-station assembly line operation eliminates the need for manual force, improving production efficiency. It can quickly adapt to product changes of multiple specifications, meeting the needs of small batches and multiple varieties. The upright process of pre-assembling the sealing cap and then pressing it in synchronously avoids damage to the sealing ring on the sealing cap. Precise positioning throughout the process ensures assembly consistency.

Description

Technical Field

[0001] This invention belongs to the field of automated assembly technology for automotive parts, and relates to a technology for assembling air spring sealing covers and retaining rings, and in particular to a highly flexible assembly line for the upright production of air spring sealing covers and retaining rings. Background Technology

[0002] Air springs, as a core component of automotive air suspension systems, are increasingly widely used in new energy vehicles, especially in new energy heavy trucks and high-end passenger vehicles. The assembly of the sealing cap and the retaining ring is a crucial step in the air spring manufacturing process. Currently, the traditional assembly of the sealing cap and retaining ring is mostly done manually or with semi-automatic equipment. The existing technology mainly suffers from the following technical problems:

[0003] Significant safety hazards: Because the retaining spring is a metal component with high elasticity, it is extremely prone to flying during manual assembly, leading to workplace injuries. Statistics show that such injuries account for 23% of all accidents related to air spring assembly.

[0004] Unstable product quality: The sealing cap is made of rubber, which is easily scratched due to misalignment or uneven force during manual assembly or press-fitting with traditional equipment, resulting in a high after-sales claim rate; at the same time, traditional equipment lacks process monitoring, and product quality cannot be traced.

[0005] Low production efficiency and high labor intensity: Especially for air springs for commercial vehicles (such as heavy trucks) with a diameter of 180mm or more, manual assembly requires a force of up to 7000N or more, which is extremely labor-intensive and has low production efficiency.

[0006] Poor flexibility and significant changeover losses: With the rapid iteration of vehicle models, traditional equipment cannot quickly adapt to the production needs of different product specifications. Changeover time often lasts for several hours, resulting in huge downtime losses and making it difficult to meet the needs of modern small-batch, multi-variety production models. Summary of the Invention

[0007] The technical problem to be solved by this invention is to provide a highly flexible assembly line for the upright production of air spring sealing caps and retaining rings. This equipment can realize the automated assembly of sealing caps and retaining rings to eliminate workplace safety hazards. Through precise positioning and guiding structures, it ensures that the retaining rings are accurately inserted into the slots to improve assembly quality. The dual-station assembly line operation eliminates the need for manual force to improve production efficiency. It can quickly adapt to the changeover of multiple product specifications to meet the needs of small-batch, multi-variety production. The upright process of pre-assembling the sealing cap and then pressing it in synchronously avoids damage to the sealing rings on the sealing cap. And the precise positioning throughout the process ensures assembly consistency.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a highly flexible production line for the upright production of air spring sealing caps and snap rings, characterized in that it includes a sealing cap assembly station and a snap ring assembly station;

[0009] The sealing cap assembly station includes:

[0010] A sealing cap supply device for supplying sealing caps, the sealing caps having snap ring grooves;

[0011] The first lifting device is used to lift the carrier seat loaded with the air spring semi-finished product on the conveyor line to the pre-assembly position of the sealing cover;

[0012] The first positioning clamping device is used to clamp and position the shock absorber telescopic rod of the air spring semi-finished product during the pre-assembly of the sealing cover, and to provide support for the connecting bushing connected to the end of the shock absorber telescopic rod.

[0013] A sealing cap pressing device is used to obtain a sealing cap from the sealing cap supply device and pre-assemble the sealing cap onto the connecting bushing;

[0014] The snap ring assembly station is located adjacent to the sealing cap assembly station, and includes:

[0015] A snap ring supply device for supplying snap rings;

[0016] The second lifting device is used to lift the carrier seat of the air spring semi-finished product with the pre-assembled sealing cover on the conveyor line to the snap ring assembly position.

[0017] The second positioning and clamping device is used to clamp and position the connection between the air chamber and the air bladder of the air spring semi-finished product during the assembly of the snap ring, and to provide support for the air chamber.

[0018] The snap ring pressing device is used to simultaneously press the sealing cap pre-assembled on the connecting bushing and the snap ring on the snap ring supply device, so that the snap ring is pressed into the snap ring groove, and at the same time press the body part of the sealing cap into the air chamber.

[0019] The retaining ring supply device includes a closing mold for placing the retaining ring. The closing mold has a guiding structure for guiding the retaining ring pressing device to accurately feed the retaining ring into the retaining ring groove during the pressing process.

[0020] The snap ring pressing device includes a pressing head, on which a plurality of mounting grooves are spaced apart along the circumference. Each mounting groove is provided with a radially retractable shrink flap, and an elastic element is connected to the shrink flap. The elastic element drives the shrink flap to expand outward.

[0021] The shrinking flap is configured such that when the pressure head presses down to the closing mold, it contacts the closing mold and overcomes the elastic force of the elastic element to shrink radially inward, so that the bottom end face of the shrinking flap can contact the retaining spring placed in the closing mold.

[0022] The bottom end face of the pressure head is configured such that when the support seat of the air spring semi-finished product with the pre-assembled sealing cover is lifted to the snap ring assembly position, it contacts the top of the body part of the sealing cover.

[0023] During the downward pressing process, the retaining spring and the sealing cap move down synchronously with the pressing head. The main body of the sealing cap is first pressed into the air chamber a certain distance, and then the retaining spring is pressed into the retaining spring groove. At the same time, the main body of the sealing cap is pressed into the air chamber to a predetermined position.

[0024] In this structure, when the pressure head presses down to the closing mold, the shrinking flap contacts the closing mold and overcomes the elastic force to shrink radially inward. The bottom end face of the shrinking flap can contact the retaining spring placed in the closing mold, thereby holding the retaining spring and moving down synchronously with the pressure head. By configuring the bottom end face of the pressure head to contact the top of the sealing cover body, the retaining spring and the sealing cover move down synchronously with the pressure head during the pressing process. The body of the sealing cover is first pressed into the air chamber of the air spring a certain distance, and then the retaining spring is pressed into the retaining spring groove. At the same time, the body of the sealing cover is pressed into the air chamber to the predetermined position, thereby realizing two-stage pressing. This ensures that the sealing ring on the sealing cover is not damaged and that the retaining spring is accurately inserted into the groove.

[0025] The snap ring pressing device also includes a floating mechanism, which is located above the pressing head and is used to provide floating displacement in the horizontal plane during the pressing process to compensate for positional deviations during pressing and prevent damage to the sealing ring on the sealing cover.

[0026] The floating mechanism includes an upper plate, a middle plate, and a lower plate stacked together. The upper plate and the middle plate are connected by a first linear guide pair, and the middle plate and the lower plate are connected by a second linear guide pair. The guiding directions of the first linear guide pair and the second linear guide pair are perpendicular to each other.

[0027] The floating mechanism further includes a reset limiting structure, which includes:

[0028] A through-shaft is connected above the upper plate and passes through the upper plate and the middle plate in sequence;

[0029] A guide shaft is disposed within the through shaft, and the lower end of the guide shaft has a conical head;

[0030] A guide block is disposed on the lower plate, and a conical groove adapted to the conical head is provided on the guide block;

[0031] A gap is left between the conical head and the conical groove to limit the floating range of the floating mechanism and guide the floating mechanism to reset after floating.

[0032] In this structure, the floating mechanism allows the pressure head to float in the X and Y axes of the horizontal plane during the pressing process. This effectively compensates for workpiece positioning errors and equipment machining deviations, preventing the pressure head from skewing and cutting the sealing ring on the sealing cover. This ensures the sealing performance of the air spring chamber and improves the assembly success rate. The reset and limiting structure limits the maximum floating range of the floating mechanism in the horizontal plane by restricting the gap between the conical head and the conical groove. This prevents equipment damage or pressing failure due to excessive floating. After one pressing is completed, the conical surface of the conical head and the conical groove guides the upper and middle plates to automatically reset to their initial center positions, providing a consistent centering reference for the next pressing and ensuring repeatability accuracy for multiple pressings. At the same time, the conical surface has good self-centering characteristics, making the reset process smooth and reliable. No additional reset drive components are required, simplifying the structural design.

[0033] The snap ring supply device further includes:

[0034] A locking mechanism is used to lock the position of the closing mold during the pressing operation of the snap ring pressing device to prevent it from shaking.

[0035] An anti-tilting mechanism is provided on the side of the closing mold, and its actuating end can extend radially into the closing mold. It is used to temporarily restrict the position of the retaining spring when placing and transporting the retaining spring, so as to prevent the retaining spring from tilting.

[0036] In this structure, the closing mold is firmly locked during the pressing process, preventing it from shaking due to the pressing force and ensuring the stability of the retaining spring position. When placing and transporting the retaining spring, the actuator of the anti-skew mechanism temporarily restricts the position of the retaining spring, preventing it from skewing due to inertial force or vibration during transport. This ensures that the retaining spring maintains the correct posture in the closing mold each time it is fed, controlling the retaining spring position deviation from the source and reducing the assembly failure rate caused by retaining spring skew.

[0037] The snap ring supply device further includes a second rotating plate and a locking part extending from one end of the second rotating plate, and the closing mold is disposed on the other end of the second rotating plate;

[0038] The locking mechanism includes a locking cylinder and a locking hole opened on the locking part. The cylinder rod of the locking cylinder can extend out and be inserted into the locking hole to lock the position of the second rotating plate, thereby locking the position of the closing mold.

[0039] The anti-misalignment mechanism includes an anti-misalignment limiting cylinder and a notch opened on the side wall of the closing mold. The anti-misalignment limiting cylinder is mounted on the second rotating plate and located on the side of the closing mold. The cylinder rod of the anti-misalignment limiting cylinder is connected to two parallel supporting rods. The supporting rods, as the actuating end of the anti-misalignment mechanism, can extend radially through the notch into the closing mold to support the retaining spring.

[0040] In this structure, the cylinder rod of the locking cylinder can extend and insert into the locking hole to lock the position of the second rotating plate in a mechanical locking manner, thereby locking the position of the closing mold and ensuring that the closing mold remains stationary during pressing. The anti-tilting limit cylinder is installed on the second rotating plate, and its cylinder rod, as the actuating end, can radially pass through the notch and extend into the closing mold to support the inserted snap ring. It maintains the correct posture of the snap ring during placement and transportation. Moreover, the structure is compact, reliable in operation, and can realize the automated transportation and precise positioning of the snap ring.

[0041] The first and second lifting devices are identical two-stage lifting structures, including a first-stage drive unit for achieving rapid lifting with a large stroke and a second-stage drive unit for adjusting the lifting height according to product specifications. In this structure, the first-stage drive unit can quickly lift the support seat from the conveyor line position, overcoming the space limitations imposed by the factory's height; the second-stage drive unit precisely adjusts the lifting height according to the current product specifications, ensuring that the connecting bushing or pre-assembled sealing cover accurately reaches the predetermined position, thereby adapting to the height differences of air spring semi-finished products of different specifications, and achieving rapid changeover and flexible production.

[0042] The sealing cap pressing device includes:

[0043] A horizontal moving mechanism for moving the sealing cap from the supply position of the sealing cap supply device to directly above the sealing cap pre-assembly position;

[0044] A vertical pressing mechanism is provided on the horizontal moving mechanism to drive the sealing cover to press down and pre-assemble it onto the connecting bushing;

[0045] A cap-removing mechanism is located at the lower end of the vertical pressing mechanism. It is used to retrieve the sealing cap from the supply position of the sealing cap supply device and keep the sealing cap stationary during the pressing process.

[0046] In this structure, the sealing cap can move in two degrees of freedom, horizontal and vertical, to meet the spatial position requirements from material picking to pressing; the cap picking mechanism keeps the sealing cap stationary during the pressing process, ensuring that the sealing cap is subjected to uniform force and has a stable posture, thus improving the pre-assembly accuracy; the horizontal moving mechanism can adapt to the distance between the supply position and the pre-assembly position of the sealing cap, which facilitates the optimization of equipment layout.

[0047] The sealing cap supply device includes a positioning seat with a positioning platform that matches the opening of the sealing cap's body portion. In this structure, when the sealing cap is placed on the positioning seat manually or by a robot, its body portion opening engages with the positioning platform, achieving precise orientation positioning of the sealing cap. The cap-retrieving mechanism retrieves the sealing cap at the same supply position and in the same orientation each time, ensuring consistent positioning of the sealing cap when it is removed and providing an accurate positional reference for subsequent pre-assembly processes.

[0048] The first positioning and clamping device includes a pair of clamping members that can move towards or away from each other. The clamping members are simultaneously provided with a first clamping part for clamping and positioning the shock absorber telescopic rod and a second clamping part for supporting the connecting bushing. The dual-purpose structure design not only achieves reliable clamping and positioning of the shock absorber telescopic rod, but also provides stable support for the connecting bushing.

[0049] The second positioning and clamping device includes:

[0050] A limiting frame is provided, which has a limiting hole that matches the lower part of the closing mold. The limiting hole is used to position the closing mold before pressing. The limiting hole ensures the coaxiality of the closing mold and the pre-assembled sealing cover.

[0051] The support mechanism includes a pair of support bodies that can move toward or away from each other, and the support bodies are provided with support parts for supporting the air chamber. The support bodies support the air chamber from below to provide stable support.

[0052] The clamping mechanism includes a pair of clamping blocks that can move toward or away from each other. The clamping blocks are provided with clamping parts for clamping and positioning the protective sleeve of the airbag or the air spring semi-finished product. The clamping blocks clamp the airbag or protective sleeve from the side to achieve circumferential positioning, ensure assembly accuracy, and ensure that the retaining ring accurately enters the retaining ring groove.

[0053] The sealing cap assembly station and the snap ring assembly station also include the same clamping mechanism. This clamping mechanism is used to clamp the air chamber or the protective sleeve of the air spring semi-finished product after the support seat is lifted, for positional alignment correction. In this structure, by setting the same clamping mechanism at the sealing cap assembly station and the snap ring assembly station, and clamping the air chamber or protective sleeve of the air spring for positional alignment correction after the support seat is lifted, the clamping mechanism performs a secondary alignment correction on the air spring semi-finished product after the lifting action is completed and before precise positioning begins, eliminating the cumulative positional deviation generated during transportation. The same mechanism can clamp the air chamber or protective sleeve, adapting to the positioning requirements of different stations and different parts. The corrected air spring semi-finished product has an accurate posture, creating favorable conditions for the subsequent precise positioning of the first and second positioning clamping devices, further improving assembly accuracy.

[0054] Compared with the prior art, the advantages of the present invention are as follows:

[0055] 1) The use of automated equipment completely replaces manual assembly. The positioning, transfer and pressing of the snap rings are all completed by machinery, which fundamentally eliminates the risk of work-related injuries caused by snap rings flying during manual assembly.

[0056] 2) The guiding structure of the closing mold guides the snap ring pressing device during the pressing process, ensuring that the snap ring always enters the snap ring groove along the correct path, effectively solving the problem of poor assembly caused by snap ring misalignment or tilting; the first positioning clamping device and the second positioning clamping device accurately position multiple key parts such as the shock absorber telescopic rod, connecting bushing, air chamber, and air bag, ensuring assembly accuracy; the upright process of pre-installing the sealing cover and then pressing it in avoids the risk of the sealing ring on the sealing cover being cut during synchronous pressing, greatly reducing the after-sales claim rate.

[0057] 3) The dual-station continuous production line design allows for simultaneous pre-assembly of sealing caps and pressing of snap rings at different stations, shortening cycle time. For air springs in commercial vehicles with a diameter of 180mm or more, automated pressing eliminates the need for manual force (above 7000N), completely freeing up labor and reducing the number of operators per production line, thus significantly improving production efficiency.

[0058] 4) The first and second lifting devices can adjust the lifting height according to different product specifications to meet the assembly requirements of various models of air springs; each device is modularly designed to support rapid model changeover, reducing the changeover time from several hours in traditional equipment to several minutes, solving the problem of large production losses due to rapid model iteration and meeting the requirements of modern production mode of small batch and multiple varieties.

[0059] 5) The positive assembly process is adopted. The sealing cover is first pre-assembled onto the connecting bushing, and then pressed in synchronously with the snap ring at the snap ring assembly station. This allows the main body of the sealing cover to enter the air chamber in two stages, effectively avoiding the risk of the sealing ring being cut in the traditional synchronous pressing method and ensuring the long-term sealing performance of the air chamber.

[0060] 6) The multi-point precise positioning of the first and second positioning clamping devices, combined with the guiding structure of the closing mold, makes the pressing process stable and controllable, providing a good process foundation for subsequent visual inspection and force displacement monitoring, and ensuring that each product meets the assembly requirements. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention. Figure 1 ;

[0062] Figure 2 This is a schematic diagram of the overall structure of the device of the present invention. Figure 2 ;

[0063] Figure 3 This is a schematic diagram of the overall structure of the device of the present invention. Figure 3 ;

[0064] Figure 4 This is a partial structural diagram of the device of the present invention. Figure 1 ;

[0065] Figure 5 This is a partial structural diagram of the device of the present invention. Figure 2 ;

[0066] Figure 6 This is a partial structural diagram of the device of the present invention. Figure 3 ;

[0067] Figure 7 This is a schematic diagram of the overall structure of the sealing cap supply device in the equipment of the present invention;

[0068] Figure 8 This is a schematic diagram of the overall structure of the first lifting device and the second lifting device in the device of the present invention;

[0069] Figure 9 for Figure 8 A longitudinal sectional view of the simplified structure after removing the guide structure;

[0070] Figure 10 This is a schematic diagram of the overall structure of the first positioning and clamping device in the device of the present invention. Figure 1 ;

[0071] Figure 11 This is a schematic diagram of the overall structure of the first positioning and clamping device in the device of the present invention. Figure 2 ;

[0072] Figure 12 This is a partially exploded structural diagram of the first positioning and clamping device in the device of the present invention (after the sealing cover is pre-assembled);

[0073] Figure 13 This is a partial structural schematic diagram of the sealing cap pressing device (with the sealing cap already sucked up) in the equipment of the present invention;

[0074] Figure 14 This is a schematic diagram of the cap removal mechanism in the cap pressing device of the present invention;

[0075] Figure 15 This is a schematic diagram of the overall structure of the snap ring supply device in the device of the present invention;

[0076] Figure 16 This is a schematic diagram of the overall structure of the second positioning and clamping device in the device of the present invention. Figure 1 ;

[0077] Figure 17This is a schematic diagram of the overall structure of the second positioning and clamping device in the device of the present invention. Figure 2 ;

[0078] Figure 18 This is a partial structural diagram of the second positioning and clamping device (after removing the limiting frame) in the device of the present invention;

[0079] Figure 19 This is a schematic diagram of the second positioning and clamping device (with the sealing cover pressed in a certain distance) in the device of the present invention;

[0080] Figure 20 This is a schematic diagram of the overall structure of the snap ring pressing device in the equipment of the present invention;

[0081] Figure 21 This is a schematic diagram of the overall structure of the pressure head in the snap ring pressing device of the present invention;

[0082] Figure 22 This is a partially exploded structural diagram of the pressure head in the snap ring pressing device of the present invention;

[0083] Figure 23 This is a schematic diagram of the overall structure of the floating mechanism in the snap ring pressing device of the present invention;

[0084] Figure 24 This is a cross-sectional view of the floating mechanism in the snap ring pressing device of the present invention;

[0085] Figure 25 This is an exploded structural diagram of the reset and limiting structure in the floating mechanism of the snap ring press-fitting device in the device of the present invention.

[0086] Figure 26 This is a schematic diagram of the overall structure of the visual inspection device in the equipment of the present invention;

[0087] Figure 27 This is a schematic diagram of the overall structure of the clamping mechanism in the device of the present invention;

[0088] Figure 28 This is a schematic diagram of the overall structure of the support base in the device of the present invention;

[0089] Figure 29 This is a schematic diagram of the overall structure of an air spring.

[0090] Figure 30 This is a schematic diagram of the sealing cover for an air spring. Detailed Implementation

[0091] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0092] like Figure 29 and Figure 30 as well as Figure 12 and Figure 28 As shown, an air spring A is a vibration damping element that uses compressed air to achieve elasticity. It typically includes an air chamber A1, an air bladder A2, a protective sleeve A3, a dust cover A4, a shock absorber A5, and a sealing cap A6. The air chamber A1, as the upper cavity of the air spring A, is used to contain compressed air. The air bladder A2 is connected below the air chamber A1 and can expand and contract with changes in air pressure. The protective sleeve A3 is fitted over the air bladder A2 for protection. The dust cover A4 is located below the protective sleeve A3 to prevent dust from entering. The shock absorber A5 is located within the cavity formed by the air chamber A1, air bladder A2, protective sleeve A3, and dust cover A4. Its shock absorber telescopic rod A51 extends upwards, and a connecting bushing A52 is fitted at the end of the telescopic rod A51. The sealing cap A6 is used to seal the top opening of the air chamber A1. The sealing cover A6 includes a body portion A61. A connecting portion A62 for fixed installation with the vehicle body is provided at the top center of the body portion A61. The side of the body portion A61 has an annular retaining ring groove (not shown in the figure) and a sealing groove (not shown in the figure). A sealing ring A65 is fitted into the sealing groove, and the retaining ring groove is positioned above the sealing groove. During assembly, the body portion A61 of the sealing cover A6 is aligned with the top opening of the air chamber A1 and pressed in, so that the sealing ring A65 fits tightly against the inner wall of the air chamber A1. After the body portion A61 of the sealing cover A6 is pressed into the predetermined position, the retaining ring A7 is embedded in the retaining ring groove. Since the natural outer diameter of the retaining ring A7 is larger than the inner diameter of the top opening of the air chamber A1, when the retaining ring A7 is pressed in, its elastic tension will cause it to expand outwards and tightly lock into the inner side of the air chamber A1, thereby achieving the fixed installation of the sealing cover A6 on the air spring. The device of the present invention is used to achieve the automated assembly of the sealing cover A6 and the retaining ring A7 described above.

[0093] This invention proposes a highly flexible assembly line for the upright production of air spring sealing caps and retaining rings, such as... Figures 1 to 28 As shown, it includes a sealing cap assembly station and a snap ring assembly station.

[0094] In this embodiment, the sealing cap assembly station includes a sealing cap supply device 1, a first lifting device 2, a first positioning and clamping device 3, and a sealing cap pressing device 4.

[0095] In this embodiment, the sealing cap supply device 1 is used to supply the sealing cap A6. The sealing cap supply device 1 includes a first mounting bracket 11, a first lifting cylinder 12, a first rotary cylinder 13, a first rotating plate 14, and a positioning seat 15. The first lifting cylinder 12 is vertically arranged, and its cylinder rod is fixedly connected to the top of the first mounting bracket 11. Its cylinder body is connected to a first adapter plate 121. The first rotary cylinder 13 is horizontally mounted on the first adapter plate 121. One end of the first rotating plate 14 is mounted on the output end of the first rotary cylinder 13. The positioning seat 15 is mounted on the other end of the first rotating plate 14. The positioning seat 15 has a positioning platform 151 that matches the opening of the body portion A61 of the sealing cap A6. The first adapter plate 121 and the first mounting bracket 11 are connected by a linear guide pair to ensure the smoothness of the lifting movement. The sealing cap A6, which is loaded onto the positioning platform 151, can be transferred from the loading position to the supply position by the first lifting cylinder 12 and the first rotary cylinder 13.

[0096] In this embodiment, the first lifting device 2 is used to lift the carrier 5, which carries the air spring semi-finished product B on the conveyor line, to the pre-assembly position of the sealing cover. The first lifting device 2 is a two-stage lifting structure, including a first-stage drive unit and a second-stage drive unit. The first-stage drive unit is a lifting cylinder 21, used to achieve rapid lifting with a large stroke; the second-stage drive unit is an electric cylinder 22 driven by a servo motor 221, used to precisely adjust the lifting height according to the product specifications. Specifically, the first lifting device 2 includes a lifting fixing plate 23, a lower cylinder fixing plate 24, a lifting cylinder 21, a middle electric cylinder fixing plate 25, a servo motor 221, and an upper lifting plate 26. The lifting fixing plate 23 serves as the mounting base for the entire lifting device, is connected to the lower cylinder fixing plate 24, and is located above the lower cylinder fixing plate 24. The lifting cylinder 21 serves as the first-stage drive unit, with its cylinder body vertically mounted on the lower cylinder fixing plate 24 and its cylinder rod connected upwards to the middle electric cylinder fixing plate 25, achieving rapid lifting with a large stroke in the first stage. The electric cylinder 22 driven by the servo motor 221 serves as the second-stage drive unit, with its cylinder body vertically mounted on the middle electric cylinder fixing plate 25 and its telescopic rod connected to the upper lifting plate 26, achieving precise adjustment of the lifting height in the second stage to adapt to the height of different specifications of air spring semi-finished products B.

[0097] In this embodiment, the support seat 5 includes a support base 51 and a support bracket 52. The support base 51 is placed on the conveyor line, and the support bracket 52 is fixed on the support base 51. It is used to support and position the shock absorber A5 of the upright air spring semi-finished product B.

[0098] In this embodiment, the first positioning and clamping device 3 is used to clamp and position the shock absorber telescopic rod A51 of the air spring semi-finished product B during the pre-assembly of the sealing cover A6, and to provide support for the connecting bushing A52 connected to the end of the shock absorber telescopic rod A51. The first positioning and clamping device 3 includes a first base plate 31, a clamping cylinder 32, and a pair of clamping members 33 that can move towards or away from each other. The first base plate 31 has a first through hole 311 through which the air chamber A1 of the air spring semi-finished product B passes. The cylinder body of the clamping cylinder 32 is mounted on the first base plate 31. The clamping cylinder 32 is a double-rod cylinder with cylinder rods on both sides. The two clamping members 33 are symmetrically connected to the cylinder rods on both sides of the clamping cylinder 32. The clamping members 33 are also provided with clamping and positioning shock absorbers. The shock absorber telescopic rod A51 has a first clamping part 331 and a second clamping part 332 for supporting the connecting bushing A52. The first clamping part 331 is a semi-circular hole opened on the clamping member 33. The two semi-circular holes on the clamping member 33 are joined together to form a limiting clamping hole (not shown in the figure) that is adapted to the shock absorber telescopic rod A51. The second clamping part 332 is a semi-annular cavity opened on the clamping member 33. The two semi-annular cavities on the clamping member 33 are joined together to form a limiting support ring (not shown in the figure) that is adapted to the connecting bushing A52. This dual-purpose structural design not only achieves the clamping and positioning of the shock absorber telescopic rod A51, but also provides reliable support for the connecting bushing A52, ensuring the accuracy of the pre-assembly of the sealing cover A6.

[0099] In this embodiment, the sealing cap pressing device 4 is used to obtain the sealing cap A6 from the sealing cap supply device 1 and pre-assemble the sealing cap A6 onto the connecting bushing A52. The sealing cap pressing device 4 includes a horizontal moving mechanism 41, a vertical pressing mechanism 42, and a cap removal mechanism 43. The horizontal moving mechanism 41 is used to move the sealing cap A6 from the supply position of the sealing cap supply device 1 to directly above the pre-assembled position of the sealing cap. The horizontal moving mechanism 41 includes a first mounting platform 411, a feed cylinder 412, and a transfer platform 413. The first mounting platform 411 has an elongated through hole 4111. The cylinder body of the feed cylinder 412 is horizontally mounted on the first mounting platform 411. The cylinder rod of the feed cylinder 412 is fixedly connected to the transfer platform 413. The transfer platform 413 and the first mounting platform 411 are connected by a linear guide pair to ensure the smoothness of horizontal movement. A vertical pressing mechanism 42 is mounted on a horizontal moving mechanism 41 and is used to press down the sealing cap A6 and pre-assemble it onto the connecting bushing A52. The vertical pressing mechanism 42 includes a cap-pressing cylinder 421, the cylinder body of which is vertically mounted on a transfer platform 413. The cylinder rod of the cap-pressing cylinder 421 passes through an elongated through-hole 4111 and connects to a cap-removing mechanism 43. The cap-removing mechanism 43 is located at the lower end of the vertical pressing mechanism 42 and is used to retrieve the sealing cap A6 from the supply position of the sealing cap supply device 1, maintaining it in an adsorbed state during the pressing process to keep the sealing cap A6 stationary and ensure the stability of the pressing process. The cap removal mechanism 43 includes a suction cup assembly, which includes a fixing block 432 and a suction cup 433 for picking up the sealing cap A6. The cylinder rod of the capping cylinder 421 is connected to the fixing block 432. The top of the suction cup 433 is connected to the fixing block 432. The lower part of the suction cup 433 has a receiving hole 4331 that is adapted to the upper part of the sealing cap A6.

[0100] In this embodiment, the snap ring assembly station and the sealing cap assembly station are arranged adjacent to each other, including a snap ring supply device 6, a second lifting device 7, a second positioning and clamping device 8, a snap ring pressing device 9, and a visual inspection device 10.

[0101] In this embodiment, the snap ring supply device 6 is used to provide snap ring A7, and includes a second mounting bracket 61, a second lifting cylinder 62, a second rotating cylinder 63, a second rotating plate 64, and a closing mold 65 for placing snap ring A7. The second lifting cylinder 62 is vertically arranged, and its cylinder rod is fixedly connected to the top of the second mounting bracket 61. Its cylinder body is connected to the second adapter plate 621. The second rotary cylinder 63 is horizontally installed on the second adapter plate 621. The second adapter plate 621 and the second mounting bracket 61 are connected by a linear guide pair to ensure the smoothness of the lifting movement. One end of the second rotary plate 64 is installed on the output end of the second rotary cylinder 63. A locking part 641 is extended from one end of the second rotary plate 64. The closing mold 65 is installed on the other end of the second rotary plate 64. The diameter of the central through hole of the closing mold 65 decreases from top to bottom to form a flared structure. This flared structure serves as a guide structure to guide the snap ring pressing device 9 to accurately send the snap ring A7 into the snap ring groove during the pressing process.

[0102] In this embodiment, the snap ring supply device 6 further includes a locking mechanism 66 and an anti-tilting mechanism 67. The locking mechanism 66 is used to lock the position of the closing mold 65 during the snap ring pressing operation of the snap ring pressing device 9, preventing it from shaking. The locking mechanism 66 includes a locking cylinder 661 and a locking hole 642 opened on the locking part 641. The cylinder body of the locking cylinder 661 is vertically mounted on the second adapter plate 621, and its cylinder rod can extend out and insert into the locking hole 642 to lock the position of the second rotating plate 64, thereby locking the position of the closing mold 65. The anti-tilting mechanism 67 is disposed on the side of the closing mold 65, and its actuating end can extend radially into the closing mold 65. It is used to temporarily restrict the position of the snap ring A7 during placement and transfer, preventing the snap ring A7 from tilting. The anti-tilt mechanism 67 includes an anti-tilt limiting cylinder 671 and a notch 652 opened on the side wall of the closing mold 65. The anti-tilt limiting cylinder 671 is installed on the second rotating plate 64 and located on the side of the closing mold 65. The cylinder rod of the anti-tilt limiting cylinder 671 is connected to two parallel supporting rods 672. The supporting rods 672, as the execution end of the anti-tilt mechanism 67, can radially pass through the notch 652 and extend into the closing mold 65 to support the lower edge of the snap ring A7 when placing it, so as to ensure that the snap ring A7 maintains the correct posture during the transfer process.

[0103] In this embodiment, the second lifting device 7 has the same structure as the first lifting device 2, both being two-stage lifting structures, used to lift the carrier 5 of the air spring semi-finished product B with the pre-assembled sealing cover A6 loaded on the conveyor line to the snap ring assembly position.

[0104] In this embodiment, the second positioning and clamping device 8 is used to clamp and position the connection between the air chamber A1 and the air bag A2 of the air spring semi-finished product B during the assembly of the retaining ring A7, and to provide support for the air chamber A1. The second positioning and clamping device 8 includes a second base plate 81, a limiting frame 82, a support mechanism 83, and a clamping mechanism 84. The second base plate 81 has a second through hole 811 through which the air chamber A1 of the air spring semi-finished product B passes. The limiting frame 82 is mounted on the second base plate 81. The upper base of the limiting frame 82 has a limiting hole 821 that matches the lower part of the closing mold 65, which is used to position the closing mold 65 before pressing to ensure the coaxiality of the closing mold 65 and the sealing cover A6 pre-assembled on the connecting bushing A52. The limiting hole 821 also allows the sealing cover A6 pre-assembled on the connecting bushing A52 to extend out. The support mechanism 83 includes a support cylinder 831 and a pair of support bodies 832 that can move in opposite directions. The cylinder body of the support cylinder 831 is mounted on the second base plate 81. The support cylinder 831 is a double-rod cylinder with cylinder rods on both sides. The two support bodies 832 are symmetrically connected to the cylinder rods on both sides of the support cylinder 831. The support body 832 is provided with a support portion 833 for supporting the air chamber A1. The support portion 833 is a semi-circular hole opened on the support body 832. The semi-circular holes on the two support bodies 832 are joined together to form a limiting support hole (not shown in the figure) that matches the connection between the air chamber A1 and the airbag A2. The clamping mechanism 84 includes two clamping cylinders 841 and two clamping blocks 842. The cylinder bodies of the two clamping cylinders 841 are symmetrically mounted on the second base plate 81. The cylinder rods of the clamping cylinders 841 are connected to the clamping blocks 842. The two clamping blocks 842 can move towards or away from each other. The clamping blocks 842 are provided with clamping parts 843 for clamping and positioning the air spring airbag A2 or protective sleeve A3. The clamping parts 843 are semi-circular holes opened on the clamping blocks 842. The semi-circular holes on the two clamping blocks 842 are joined together to form a limiting clamping hole (not shown in the figure) that is adapted to the airbag A2 or protective sleeve A3.

[0105] In this embodiment, the snap ring pressing device 9 is used to simultaneously press in the sealing cap A6 pre-assembled on the connecting bushing A52 and the snap ring A7 on the snap ring supply device 6, so that the snap ring A7 is pressed into the snap ring groove, and at the same time, the body part A61 of the sealing cap A6 is pressed into the air chamber A1. The snap ring pressing device 9 includes a press 91, a second mounting platform 92, a moving plate 93, a pressing head 94, and a floating mechanism 95. The press 91 is vertically mounted on the second mounting platform 92, and its output end is connected to the moving plate 93 facing downward. The moving plate 93 is connected to the pressing head 94 through the floating mechanism 95. The pressure head 94 has multiple mounting slots 941 spaced circumferentially. Each mounting slot 941 contains a radially retractable contraction flap 942. An elastic element 943 is connected to the contraction flap 942, and the elastic element 943 drives the contraction flap 942 to expand outward. The contraction flap 942 is configured such that when the pressure head 94 presses down to the closing mold 65, it contacts the closing mold 65 and overcomes the elastic force of the elastic element 943 to radially retract inward, so that the bottom end face of the contraction flap 942 can contact the retaining spring A7 placed in the closing mold 65. The bottom end face of the pressure head 94 is configured such that when the support seat 5 of the air spring semi-finished product B, which is loaded with the pre-assembled sealing cover A6, is lifted to the retaining spring assembly position, it contacts the sealing cover A6. The top of the body part A61 of the 6 is in contact; the elastic element 943 is a spring, which is sleeved on a stud 944 and confined within the mounting groove 941. The stud 944 is connected to the contraction flap 942, and multiple elastic elements 943 can be connected to each contraction flap 942; during the pressing process of the pressure head 94, the retaining spring A7 and the sealing cover A6 move down synchronously with the pressure head 94. The body part A61 of the sealing cover A6 is first pressed into the air chamber A1 a certain distance (that is, the body part A61 of the sealing cover A6 is first pressed into the air chamber A1 to a preset depth, but has not reached the final pressed position), and then the retaining spring A7 is pressed into the retaining spring groove, while the body part A61 of the sealing cover A6 is pressed into the air chamber A1 to the predetermined position. The floating mechanism 95 is used to provide floating displacement in the horizontal plane during the pressing process to compensate for the positional deviation during pressing and prevent the sealing ring A65 on the sealing cover A6 from being damaged. The floating mechanism 95 includes an upper plate 951, a middle plate 952, and a lower plate 953 stacked together. The upper plate 951 is connected to the moving plate 93 via a receiving plate 954. The lower plate 953 is connected to the top of the pressure head 94. The upper plate 951 and the middle plate 952 are connected by two parallel first linear guide pairs 955. The middle plate 952 and the lower plate 953 are connected by two parallel second linear guide pairs 956. The guiding directions of the first linear guide pairs 955 and the second linear guide pairs 956 are perpendicular to each other, realizing floating in the X-axis and Y-axis directions.The floating mechanism 95 also includes a reset limiting structure, which includes a through shaft 957, a guide shaft 958, and a guide block 959. The through shaft 957 is connected above the upper plate 951, that is, connected to the bottom of the receiving plate 954. The through shaft 957 passes through the upper plate 951 and the middle plate 952. The guide shaft 958 with a conical head 9581 is provided inside the through shaft 957. The guide block 959 with a conical groove 9591 is provided on the lower plate 953. The conical head 9581 and the conical groove 9591 are adapted to each other and there is a gap between them, which is used to limit the floating range and realize reset, and guide the floating mechanism 95 to reset after floating.

[0106] In this embodiment, the visual inspection device 10 includes a third mounting bracket 101, a vertical moving cylinder 102, a horizontal moving cylinder 103, and a visual inspection camera 104. The cylinder body of the vertical moving cylinder 102 is vertically mounted on the third mounting bracket 101. The cylinder rod of the vertical moving cylinder 102 pushes the horizontal moving cylinder 103 to move up and down. The cylinder rod of the horizontal moving cylinder 103 is connected to the visual inspection camera 104. The visual inspection camera 104 is located on one side of the snap ring pressing device 9 and is used to take pictures to inspect the assembly status of the snap ring A7 after the snap ring A7 is pressed. The visual inspection camera 104 is connected to the control system. If the snap ring A7 is pressed into place, it is considered qualified; otherwise, it is judged as unqualified and an alarm signal is issued, thereby realizing online monitoring and traceability of product quality.

[0107] In this embodiment, the press 91 is a servo electronic press with built-in high-precision pressure and displacement sensors, providing force and displacement monitoring capabilities. During the pressing process, the press 91 collects pressure and displacement data in real time, displays the pressure-displacement curve on the control system interface, and allows setting multiple judgment windows for online monitoring of the pressing process. The force and displacement monitoring function effectively detects potential problems during the pressing process, such as the sealing ring A65 of the sealing cap A6 being cut or abnormal pressing resistance of the retaining ring A7, providing process assurance for pressing quality. After pressing is completed, the visual inspection camera 104 photographs and inspects the final assembly state of the retaining ring A7; together, these two elements constitute a complete product quality monitoring system.

[0108] In this embodiment, the sealing cap assembly station and the snap ring assembly station also include the same clamping mechanism C. The clamping mechanism C is used to clamp the air chamber A1 (in the sealing cap assembly station) or the protective sleeve A3 of the air spring semi-finished product B (in the snap ring assembly station) after the support seat 5 is lifted, so as to perform position alignment correction. The clamping mechanism C includes a fourth mounting bracket C1, an electric slide C2, a transverse bracket C3, a moving cylinder C4, and a gripper cylinder C5. The electric slide C2 is mounted on the fourth mounting bracket C1, and the transverse bracket C3 is fixed to the electric slide C2. The electric slide C2 drives the transverse bracket C3 to move up and down to accommodate air spring semi-finished products B of different heights. The cylinder body of the moving cylinder C4 is horizontally mounted on the transverse bracket C3. The cylinder rod of the moving cylinder C4 is connected to the cylinder body of the gripper cylinder C5 through the adapter C6, which is used to drive the gripper cylinder C5 to move horizontally. The gripper cylinder C5 is connected to a pair of grippers C7 for clamping the air chamber A1 or the protective cylinder A3. The adapter C6 is connected to the transverse bracket C3 through a linear guide pair to ensure the stability of horizontal movement.

[0109] In this embodiment, the device further includes a base box D and a lifting frame E. The lifting frame E is mounted on the base box D. The first mounting bracket 11, the second mounting bracket 61, the fourth mounting bracket C1, and the lifting fixing plate 23 are all fixed on the base box D. The first base plate 31, the second base plate 81, and the third mounting bracket 101 are all fixed on the platform of the lifting frame E. The first mounting platform 411 and the second mounting platform 92 are both raised and fixed on the platform of the lifting frame E.

[0110] In this embodiment, the sealing cap supply device 1 and the snap ring supply device 6 can be automatically fed.

[0111] The assembly process of the device of this invention is as follows:

[0112] Step 1: Pre-assembly of the sealing cap

[0113] The air spring semi-finished product B arrives at the sealing cover assembly station along the conveyor line with the carrier seat 5. The first lifting device 2 is activated, and its first-stage drive unit (lifting cylinder 21) quickly lifts the carrier seat 5. The second-stage drive unit (electric cylinder 22) precisely adjusts the lifting height according to the product specifications, so that the connecting bushing A52 reaches the pre-assembly position of the sealing cover.

[0114] The clamping mechanism C in the sealing cap assembly station is activated, and the clamping air chamber A1 is aligned and corrected. The first positioning clamping device 3 is activated, and a pair of clamping parts 33 move towards each other. The first clamping part 331 clamps the shock absorber telescopic rod A51, and the second clamping part 332 provides support for the connecting bushing A52. The clamping mechanism C is then released.

[0115] The sealing cap supply device 1 transfers the sealing cap A6 to the supply position. The horizontal moving mechanism 41 of the sealing cap pressing device 4 drives the cap picking mechanism 43 to move to the supply position to obtain the sealing cap A6, and then brings the sealing cap A6 directly above the sealing cap pre-assembly position; the vertical pressing mechanism 42 drives the cap picking mechanism 43 to press down, pre-assembling the sealing cap A6 onto the connecting bushing A52. The cap picking mechanism 43 maintains an adsorption state during the pressing process to keep the sealing cap A6 stationary.

[0116] After pre-assembly, the first positioning clamping device 3 is released, the first lifting device 2 falls back, and the conveyor line transports the air spring semi-finished product B to the snap ring assembly station.

[0117] Step 2: Synchronous pressing of the snap rings

[0118] The air spring semi-finished product B arrives at the snap ring assembly station. The lower part of the closing mold 65, on which the snap ring A7 has been placed, is inserted into the limiting hole 821 of the limiting frame 82 of the second positioning clamping device 8, and the position of the closing mold 65 is locked by the locking mechanism 66.

[0119] The second lifting device 7 lifts the support seat 5 to the snap ring assembly position. The clamping mechanism C in the snap ring assembly station clamps the protective sleeve A3 for positional alignment. In the second positioning and clamping device 8, the support body 832 of the support mechanism 83 moves towards each other to support the air chamber A1, and the clamping blocks 842 of the clamping mechanism 84 move towards each other to clamp the air bladder A2 or the protective sleeve A3. The clamping mechanism C then releases.

[0120] The press 91 of the snap ring pressing device 9 drives the press head 94 to press down. When the press head 94 presses down to the closing mold 65, the shrinking flap 942 contacts the flaring structure of the closing mold 65, overcomes the elastic force and shrinks radially inward, so that the bottom end face of the shrinking flap 942 contacts the snap ring A7; at the same time, the bottom end face of the press head 94 contacts the top of the body part A61 of the sealing cover A6.

[0121] The cylinder rod of the anti-tilting mechanism 67 retracts, releasing the support of the retaining ring A7.

[0122] The pressure head 94 continues to press down, and the retaining ring A7 and the sealing cap A6 move down synchronously with the pressure head 94. This process is divided into two stages:

[0123] First stage: The main body A61 of the sealing cover A6 is first pressed into the air chamber A1 a certain distance. At this time, the snap ring A7 is held by the contraction valve 942 and moves down with the pressure head 94, but has not yet entered the snap ring groove.

[0124] Second stage: Press head 94 continues to press down, the retaining ring A7 is pressed into the retaining ring groove, and at the same time the main body A61 of the sealing cover A6 is pressed into the air chamber A1 to the predetermined position, completing the synchronous pressing.

[0125] During the pressing process, the floating mechanism 95 provides floating displacement in the X and Y axes in the horizontal plane to compensate for positional deviations and prevent damage to the sealing ring A65 on the sealing cover A6.

[0126] After pressing is completed, locking mechanism 66 unlocks, closing mold 65 moves away, and visual inspection device 10 takes pictures to inspect the assembly status of snap ring A7 to determine whether the assembly is qualified. Second positioning clamping device 8 is released, and second lifting device 7 is lowered.

Claims

1. A highly flexible assembly line for the upright production of air spring sealing caps and retaining rings, characterized in that, This includes the sealing cap assembly station and the snap ring assembly station; The sealing cap assembly station includes: A sealing cap supply device for supplying sealing caps, the sealing caps having snap ring grooves; The first lifting device is used to lift the carrier seat loaded with the air spring semi-finished product on the conveyor line to the pre-assembly position of the sealing cover; The first positioning clamping device is used to clamp and position the shock absorber telescopic rod of the air spring semi-finished product during the pre-assembly of the sealing cover, and to provide support for the connecting bushing connected to the end of the shock absorber telescopic rod. A sealing cap pressing device is used to obtain a sealing cap from the sealing cap supply device and pre-assemble the sealing cap onto the connecting bushing; The snap ring assembly station is located adjacent to the sealing cap assembly station, and includes: A snap ring supply device for supplying snap rings; The second lifting device is used to lift the carrier seat of the air spring semi-finished product with the pre-assembled sealing cover on the conveyor line to the snap ring assembly position. The second positioning and clamping device is used to clamp and position the connection between the air chamber and the air bladder of the air spring semi-finished product during the assembly of the snap ring, and to provide support for the air chamber. The snap ring pressing device is used to simultaneously press the sealing cap pre-assembled on the connecting bushing and the snap ring on the snap ring supply device, so that the snap ring is pressed into the snap ring groove, and at the same time press the body part of the sealing cap into the air chamber. The retaining ring supply device includes a closing mold for placing the retaining ring. The closing mold has a guiding structure for guiding the retaining ring pressing device to accurately feed the retaining ring into the retaining ring groove during the pressing process.

2. The high-flexibility assembly line for producing air spring sealing caps and retaining rings according to claim 1, characterized in that, The snap ring pressing device includes a pressing head, on which a plurality of mounting grooves are spaced apart along the circumference. Each mounting groove is provided with a radially retractable shrink flap, and an elastic element is connected to the shrink flap. The elastic element drives the shrink flap to expand outward. The shrinking flap is configured such that when the pressure head presses down to the closing mold, it contacts the closing mold and overcomes the elastic force of the elastic element to shrink radially inward, so that the bottom end face of the shrinking flap can contact the retaining spring placed in the closing mold. The bottom end face of the pressure head is configured such that when the support seat of the air spring semi-finished product with the pre-assembled sealing cover is lifted to the snap ring assembly position, it contacts the top of the body part of the sealing cover. During the downward pressing process, the retaining spring and the sealing cap move down synchronously with the pressing head. The main body of the sealing cap is first pressed into the air chamber a certain distance, and then the retaining spring is pressed into the retaining spring groove. At the same time, the main body of the sealing cap is pressed into the air chamber to a predetermined position.

3. The high-flexibility assembly line for producing air spring sealing caps and retaining rings according to claim 2, characterized in that, The snap ring pressing device also includes a floating mechanism, which is located above the pressing head and is used to provide floating displacement in the horizontal plane during the pressing process to compensate for positional deviations during pressing and prevent damage to the sealing ring on the sealing cover. The floating mechanism includes an upper plate, a middle plate, and a lower plate stacked together. The upper plate and the middle plate are connected by a first linear guide pair, and the middle plate and the lower plate are connected by a second linear guide pair. The guiding directions of the first linear guide pair and the second linear guide pair are perpendicular to each other. The floating mechanism further includes a reset limiting structure, which includes: A through shaft is connected above the upper plate and passes through the upper plate and the middle plate in sequence; A guide shaft is disposed within the through shaft, and the lower end of the guide shaft has a conical head; A guide block is disposed on the lower plate, and a conical groove adapted to the conical head is provided on the guide block; A gap is left between the conical head and the conical groove to limit the floating range of the floating mechanism and guide the floating mechanism to reset after floating.

4. The high-flexibility assembly line for producing air spring sealing caps and retaining rings according to claim 1, characterized in that, The snap ring supply device further includes: A locking mechanism is used to lock the position of the closing mold during the pressing operation of the snap ring pressing device to prevent it from shaking. An anti-tilting mechanism is provided on the side of the closing mold, and its actuating end can extend radially into the closing mold. It is used to temporarily restrict the position of the retaining spring when placing and transporting the retaining spring, so as to prevent the retaining spring from tilting.

5. The high-flexibility assembly line for producing air spring sealing caps and retaining rings according to claim 4, characterized in that, The snap ring supply device further includes a second rotating plate and a locking part extending from one end of the second rotating plate, and the closing mold is disposed on the other end of the second rotating plate; The locking mechanism includes a locking cylinder and a locking hole opened on the locking part. The cylinder rod of the locking cylinder can extend out and be inserted into the locking hole to lock the position of the second rotating plate, thereby locking the position of the closing mold. The anti-misalignment mechanism includes an anti-misalignment limiting cylinder and a notch opened on the side wall of the closing mold. The anti-misalignment limiting cylinder is mounted on the second rotating plate and located on the side of the closing mold. The cylinder rod of the anti-misalignment limiting cylinder is connected to two parallel supporting rods. The supporting rods, as the actuating end of the anti-misalignment mechanism, can extend radially through the notch into the closing mold to support the retaining spring.

6. The high-flexibility assembly line for producing air spring sealing caps and retaining rings according to claim 1, characterized in that, The first lifting device and the second lifting device are the same two-stage lifting structure, including a first-stage drive unit for achieving large-stroke rapid lifting and a second-stage drive unit for adjusting the lifting height according to product specifications.

7. The high-flexibility assembly line for producing air spring sealing caps and retaining rings according to claim 1, characterized in that, The sealing cap pressing device includes: A horizontal moving mechanism for moving the sealing cap from the supply position of the sealing cap supply device to directly above the sealing cap pre-assembly position; A vertical pressing mechanism is provided on the horizontal moving mechanism to drive the sealing cover to press down and pre-assemble it onto the connecting bushing; A cap-removing mechanism is located at the lower end of the vertical pressing mechanism. It is used to retrieve the sealing cap from the supply position of the sealing cap supply device and keep the sealing cap stationary during the pressing process.

8. The high-flexibility assembly line for producing air spring sealing caps and retaining rings according to claim 1, characterized in that, The sealing cap supply device includes a positioning seat having a positioning platform that is adapted to the opening of the body portion of the sealing cap.

9. The high-flexibility assembly line for producing air spring sealing caps and retaining rings in an upright position according to claim 1, characterized in that, The first positioning and clamping device includes a pair of clamping members that can move towards or away from each other. The clamping members are simultaneously provided with a first clamping part for clamping and positioning the shock absorber telescopic rod and a second clamping part for supporting the connecting bushing. The second positioning and clamping device includes: A limiting frame is provided, which has a limiting hole that matches the lower part of the closing mold, for positioning the closing mold before pressing. The support mechanism includes a pair of support bodies that can move toward or away from each other, and the support bodies are provided with support portions for supporting the air chamber. The clamping mechanism includes a pair of clamping blocks that can move toward or away from each other, and the clamping blocks are provided with clamping parts for clamping and positioning the protective sleeve of the airbag or the air spring semi-finished product.

10. The high-flexibility assembly line for producing air spring sealing caps and retaining rings in an upright position according to claim 1, characterized in that, The sealing cap assembly station and the snap ring assembly station also include the same clamping mechanism, which is used to clamp the protective sleeve of the air chamber or the air spring semi-finished product after the support seat is lifted, so as to perform position centering correction.

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