Welded bellows air spring isolator

Abstract

The application discloses a welded corrugated pipe air spring vibration isolator, which comprises a metal cylinder base, a welded corrugated pipe arranged in the metal cylinder base and kept concentric with the metal cylinder base, a welded corrugated pipe upper flange and a welded corrugated pipe lower flange connected to the top and bottom of the welded corrugated pipe respectively, a bearing column arranged concentrically on the inner side of the welded corrugated pipe, a bearing column upper plate connected to the top end of the bearing column and penetrating through the metal cylinder base upwards, a bearing column lower plate connected to the bottom end of the bearing column and penetrating through the welded corrugated pipe lower flange downwards, and the welded corrugated pipe upper flange is fixedly connected to the top of the inner side of the metal cylinder base, and the welded corrugated pipe lower flange is connected to the bearing column lower plate. The welded corrugated pipe made of metal material is used to replace the existing rubber material, so that the welded corrugated pipe air spring vibration isolator can withstand high and low temperatures and special environments which cannot be withstood by the traditional rubber air spring vibration isolator while the advantages of adjustable rigidity of the traditional rubber air spring vibration isolator are retained.

Description

Technical Field

[0001] This invention relates to the field of vibration isolator technology, specifically to a welded bellows air spring vibration isolator. Background Technology

[0002] Currently, air spring vibration isolators on the market are mainly composed of rubber and air. They have low internal friction and their vibration isolation performance is not affected by their own inherent vibrations. By changing the gas pressure inside the rubber, different load-bearing capacities can be obtained. The load-bearing capacity is directly proportional to the internal pressure, allowing a single rubber air spring to meet various load requirements. However, the rubber in existing vibration isolators is directly mounted on the top of the metal cylinder and exposed. The rubber material is mainly neoprene rubber and natural rubber. Rubber has a short service life, is prone to aging, and is difficult to use in extreme and harsh conditions, such as high and low temperatures, humid and corrosive environments. In addition, when the load on the vibration isolator vibrates with large displacement, the rubber material will experience fatigue wear due to large and high-frequency expansion, leading to a shortened service life of the vibration isolator. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a welded bellows air spring vibration isolator.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a welded bellows air spring vibration isolator, comprising a metal cylinder seat and a welded bellows disposed inside the metal cylinder seat and concentrically therewith. The top and bottom of the welded bellows are respectively connected to an upper flange and a lower flange. A receiving column is concentrically disposed on the inner side of the welded bellows. The top of the receiving column extends upward through the metal cylinder seat and is connected to an upper plate. The bottom of the receiving column extends downward through the lower flange and is connected to a lower plate. The upper flange of the welded bellows is fixedly connected to the top of the inner side of the metal cylinder seat, and the lower flange of the welded bellows is connected to the lower plate of the receiving column. Several guide columns are also arranged vertically inside the metal cylinder seat, and all guide columns are arranged in a ring around the axis of the receiving column. The lower flange of the welded bellows and the lower plate of the receiving column both penetrate the guide columns and are sleeved on them.

[0005] Preferably, limiters are fitted at the middle and bottom of the circumferential surface of the guide post, respectively, and the limiters are used to limit the deformation of the welded bellows.

[0006] Preferably, it also includes a hydraulic damping element disposed at the bottom of the metal cylinder seat.

[0007] Preferably, the hydraulic damping component includes a hydraulic cylinder installed at the bottom of the metal cylinder seat, the inside of the hydraulic cylinder is filled with hydraulic oil, a connecting rod is connected vertically at the center of the bottom of the support column lower plate, the connecting rod extends axially downward through the metal cylinder seat and the outer cylinder and into the interior of the hydraulic cylinder, and after the connecting rod extends into the interior of the hydraulic cylinder, a fixing plate is connected horizontally at its bottom, and several first sector-shaped notches are opened on the surface of the fixing plate.

[0008] Preferably, a limiting plate is formed on the circumferential surface of the connecting rod near its bottom, extending radially outward. A sleeve is rotatably fitted onto the outside of the connecting rod between the limiting plate and the fixed plate. A rotating plate of the same specifications as the fixed plate is fixedly connected to the bottom of the sleeve. The rotating plate is attached to the upper end face of the fixed plate, and a second sector-shaped notch is distributed in a ring on the surface of the rotating plate, matching the number of the first sector-shaped notches. The first and second sector-shaped notches are of the same specifications. During the operation of the vibration isolator, the rotating plate rotates relative to the fixed plate, thereby changing the communication area between the first and second sector-shaped notches.

[0009] Preferably, a circular ring plate is fitted onto the outside of the sleeve, and a limit bead is integrally formed on the inner side of the circular ring plate. A spiral groove with a diameter matching the limit bead is formed along the axial direction on the circumference of the sleeve. In the initial state, the circular ring plate is located in the middle of the sleeve. When adjusting the load capacity of the welded bellows, the circular ring plate remains stationary relative to the sleeve, and the two move synchronously in the vertical direction. When the vibration isolator is running, the circular ring plate remains fixed in the vertical direction, and the sleeve rotates along its own axial direction when it moves in the vertical direction through the cooperation of the limit bead and the spiral groove.

[0010] Preferably, an outer ring is concentrically arranged on the outer side of the annular plate, and the annular plate and the outer ring are connected and fixed by four connecting seats. A fixing rod is fixed inside the connecting seat along its length. One end of the fixing rod extends toward the center of the annular plate, passes through the connecting seat, and is fixedly sleeved with a first gear. The other end extends toward the inner wall of the hydraulic cylinder, passes through the connecting seat, and is fixedly sleeved with a second gear. A ring rack is concentrically rotatably installed on the upper end of the annular plate, and the ring rack meshes with the four first gears.

[0011] The inner wall of the hydraulic cylinder has a groove corresponding to the position of each second gear, and the groove is T-shaped. The fixing rod extends into the groove and is sleeved with the second gear. A rack that meshes with the second gear is also fixed in the vertical direction inside the groove.

[0012] The annular plate has a hollow interior. The bottom of the annular rack extends into the interior of the annular plate and is integrally connected to a T-shaped seat. A pressure ring is fixed inside the annular plate on the inner side of the T-shaped seat. Two opposing connecting seats are equipped with cylinders along their length. The piston end of each cylinder extends towards the center of the annular plate and is fixedly connected to an arc-shaped extrusion plate. The cylinder drives the arc-shaped extrusion plate to move towards the T-shaped seat, thereby clamping the T-shaped seat.

[0013] Preferably, two telescopic rods are fixed vertically on the upper surface of the fixed plate. The telescopic rods extend upward and pass through the rotating plate. The movable end of the telescopic rod is fixedly connected to the bottom of the annular plate. A second spring is also sleeved on the outside of the telescopic rod. One end of the second spring is connected to the annular plate, and the other end is connected to the fixed end of the telescopic rod. The spring force of the second spring provides support for the annular plate. An arc-shaped guide groove is provided on the rotating plate on the rotation trajectory corresponding to the telescopic rod.

[0014] Preferably, a first spring is sleeved on the outside of the connecting rod, with the bottom end of the first spring connected to the limiting plate and the top end connected to the bottom of the metal cylinder seat.

[0015] Compared with the prior art, the present invention provides a welded bellows air spring vibration isolator, which has the following characteristics:

[0016] Beneficial effects:

[0017] (1) The present invention places the rubber in the vibration isolator inside the metal cylinder to avoid direct exposure to the outside and avoid contact with the complex external environment. It also proposes to replace the existing rubber material with a welded corrugated pipe made of metal. While retaining the advantage of adjustable stiffness of the traditional rubber air spring vibration isolator, it can also cope with high and low temperatures and special environments that the traditional rubber air spring vibration isolator cannot withstand.

[0018] (2) In the operation of the vibration isolator of the present invention, not only does the welded bellows play a role in vibration isolation, but the hydraulic damping component at the bottom of the metal cylinder seat also participates in the work. When the welded bellows is extended and retracted, the rotating plate and the fixed plate at its bottom move up and down in the hydraulic oil. The resistance formed by the hydraulic oil on the two plates can play a certain damping effect. When the sleeve on the rotating plate moves back and forth in the vertical direction, the limiting bead inside the annular plate slides in the spiral groove on the circumferential surface of the sleeve, which will drive the sleeve to rotate along its axial direction. The rotating plate and the fixed plate will be misaligned, which will reduce the connection area between the first sector notch and the second sector notch, thereby increasing the damping effect of the hydraulic damping component. Moreover, the greater the vibration amplitude of the equipment, the greater the relative rotation angle between the rotating plate and the fixed plate, and the damping effect of the hydraulic damping component will also be improved. This satisfies the vibration reduction of the equipment and also plays a certain protective role for the welded bellows. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the entire device in the embodiment;

[0021] Figure 2 This is a three-dimensional cross-sectional schematic diagram of the entire device in the embodiment;

[0022] Figure 3 This is a schematic diagram of the assembly of the welded bellows and the supporting column in the embodiment;

[0023] Figure 4 This is a schematic diagram of the internal structure of the hydraulic cylinder in the embodiment;

[0024] Figure 5 This is a schematic diagram of the assembly of the fixed plate and the rotating plate in the embodiment;

[0025] Figure 6 This is a schematic diagram of the structure of the fixing plate in the embodiment;

[0026] Figure 7 This is a schematic diagram of the rotating plate in the embodiment;

[0027] Figure 8 This is a schematic diagram of the various structures on the annular plate in the embodiment;

[0028] Figure 9 This is a three-dimensional cross-sectional schematic diagram of the annular plate and the connecting seat in the embodiment;

[0029] Figure 10 This is a partial structural diagram of the hydraulic cylinder body in the embodiment.

[0030] In the diagram: 1. Outer cylinder; 2. Metal cylinder seat; 3. Upper plate of the receiving column; 4. Air inlet; 5. Solenoid valve; 6. Hydraulic cylinder; 7. Receiving column; 8. Guide column; 9. Welded bellows; 10. Limiter; 11. Connecting rod; 12. Upper flange of welded bellows; 13. Lower flange of welded bellows; 14. Lower plate of the receiving column; 15. First spring; 16. Slide groove; 17. Rack; 18. Limiting plate; 19. Rotating plate; 20. 21. Fixed plate; 22. Sleeve; 23. Telescopic rod; 24. First sector-shaped notch; 25. Second spring; 26. Spiral groove; 27. Arc-shaped guide groove; 28. Second sector-shaped notch; 29. ​​Circular ring plate; 30. Circular rack; 31. Limiting bead; 32. Outer ring; 33. Connecting seat; 34. Through groove; 35. T-shaped seat; 36. Pressure bearing ring; 37. First gear; 38. Second gear; 39. Cylinder; 30. Arc-shaped extrusion plate. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] This embodiment proposes a welded bellows air spring vibration isolator, such as... Figures 1 to 10 As shown, the device includes a metal cylinder seat 2 and a welded bellows 9 vertically disposed inside the metal cylinder seat 2. The top and bottom of the welded bellows 9 are respectively connected to an upper flange 12 and a lower flange 13. A support column 7 is concentrically disposed inside the welded bellows 9. The top of the support column 7 extends upward through the metal cylinder seat 2 and is connected to an upper support column plate 3, while the bottom of the support column 7 extends downward through the lower flange 13 and is connected to a lower support column plate 14. The upper flange 12 of the welded bellows is fixedly connected to the top of the inner side of the metal cylinder seat 2, and the lower flange 13 of the welded bellows is connected to the lower support column plate 14. Four guide columns 8 are also arranged vertically inside the metal cylinder seat 2, and the four guide columns 8 are arranged in a ring around the axis of the support column 7. The lower flange 13 of the welded bellows and the lower support column plate 14 both pass through the guide columns 8 and are sleeved on the guide columns 8. An air inlet 4 is connected to the outer wall of the metal cylinder seat 2. Limiters 10 are fitted at the middle and bottom of the circumference of the guide column 8 to prevent excessive pressure on the upper plate 3 of the supporting column, which could lead to excessive stretching or compression of the welded bellows 9 and damage its performance. When idle, the metal cylinder seat 2 is not inflated, and the welded bellows 9 should deform to +15% (stretched under gravity) when the upper plate 3 of the supporting column is unloaded. The lower flange 13 of the welded bellows and the lower plate 14 of the supporting column are located at the limiters 10 below. When the vibration isolator is running, air is introduced into the metal cylinder seat 2 through the air inlet 4. When the upper plate 3 of the supporting column is unloaded, the welded bellows 9 should deform to -50% (compressed), and the stroke can reach 75% (-60% to 15%) of the length of the welded bellows 9. By changing the air pressure inside the metal cylinder seat 2, the load range of the vibration isolator can be changed.

[0033] In addition, the diameter of the guide post 8 can be smaller than the diameter of the guide hole on the lower flange 13 of the welded bellows and the lower plate 14 of the receiving post, so as to facilitate a small-amplitude offset of the welded bellows 9. Reducing the diameter of the guide post 8 or increasing the diameter of the guide hole can increase the offset capability (tilt) of the welded bellows 9 in the x and y axis directions.

[0034] To further improve the vibration isolation performance of the vibration isolator, the present invention also provides a hydraulic damping component at the bottom of the metal cylinder seat 2. This hydraulic damping component includes a hydraulic cylinder 6 installed at the bottom of the metal cylinder seat 2, and the hydraulic cylinder 6 is embedded inside the outer cylinder 1. The entire metal cylinder seat 2 is fixedly installed on the top of the outer cylinder 1. The hydraulic cylinder 6 is filled with a certain volume of hydraulic oil. A connecting rod 11 is vertically connected to the center of the bottom of the support column lower plate 14. This connecting rod 11 extends axially downwards through the metal cylinder seat 2 and the outer cylinder 1, then extends into the hydraulic cylinder 6. After extending into the hydraulic cylinder 6, the connecting rod 11 extends along its bottom... A fixed plate 20 is horizontally connected. A limiting plate 18 extends radially outward from the bottom of the circumferential surface of the connecting rod 11. A sleeve 21 is rotatably fitted between the limiting plate 18 and the fixed plate 20 on the outside of the connecting rod 11. A rotating plate 19 of the same specifications as the fixed plate 20 is fixedly connected to the bottom of the sleeve 21, and the rotating plate 19 fits against the upper end face of the fixed plate 20. Three second sector-shaped notches 27 are distributed in a ring on the surface of the rotating plate 19, while a first sector-shaped notch 23 of the same specifications as the second sector-shaped notches 27 is opened on the surface of the fixed plate 20. In the initial state, the fixed plate 20... The first sector-shaped notch 23 and the second sector-shaped notch 27 on the rotating plate 19 are fully connected (i.e., they are vertically aligned). When gas is injected into the hydraulic cylinder 6 through the air inlet 4 to adjust the deformation of the welded bellows 9, the connecting rod 11 drives the fixed plate 20 and the rotating plate 19 to move up and down synchronously in the vertical direction. During this process, the first sector-shaped notch 23 and the second sector-shaped notch 27 are fully connected, which reduces the resistance of the rotating plate 19 and the fixed plate 20 to the hydraulic oil. After the deformation of the welded bellows 9 is adjusted, when the entire vibration isolator is running, the welded bellows 9 is affected by the vibration of the equipment. The hydraulic cylinder 6 reciprocates at a certain frequency in the vertical direction. During the movement, the hydraulic oil inside the cylinder 6 continuously passes through the first sector-shaped notch 23 and the second sector-shaped notch 27. The resistance formed by the hydraulic oil on the rotating plate 19 and the fixed plate 20 can absorb the vibration of the equipment. Furthermore, during the reciprocating motion in the vertical direction, the rotating plate 19 can also rotate relative to the fixed plate 20. This reduces the connection area between the first sector-shaped notch 23 and the second sector-shaped notch 27, increases the contact area between the hydraulic oil and the rotating plate 19 and the fixed plate 20, and further enhances its damping effect.

[0035] To achieve the above objectives, the present invention includes an annular plate 28 fitted onto the outside of the sleeve 21. A limiting bead 30 is integrally formed on the inner side of the annular plate 28. A spiral groove 25 is formed along the axial direction on the circumferential surface of the sleeve 21. Initially, the annular plate 28 is located in the middle of the sleeve 21, with an outer ring 31 concentrically arranged on its outer side. The diameter of the outer ring 31 is not limited, but it is preferable that the outer side of the outer ring 31 is as close as possible to the inner wall of the hydraulic cylinder 6. This supports the fixing rod connecting the first gear 36 and the second gear 37, preventing the fixing rod from bearing a large bending moment. The annular plate 28 and the outer ring 31 are connected and fixed by four connecting seats 32. The interior of the connecting seats 32 extends along their length... A fixing rod is fixed in the direction of the ring plate 28. One end of the fixing rod extends towards the center of the ring plate 28, passes through the connecting seat 32, and is fixedly sleeved with the first gear 36. The other end extends towards the inner wall of the hydraulic cylinder 6, passes through the connecting seat 32, and is fixedly sleeved with the second gear 37. A ring rack 29 is concentrically mounted on the upper end of the ring plate 28. The ring rack 29 meshes with the four first gears 36. A groove 16 is formed on the inner wall of the hydraulic cylinder 6 at the position of each second gear 37. The groove 16 is T-shaped. The fixing rod extends into the groove 16 and is sleeved with the second gear 37. A rack 17 that meshes with the second gear 37 is also fixed in the vertical direction inside the groove 16. In order to keep the annular plate 28 in the middle of the sleeve 21, the present invention has two telescopic rods 22 fixed vertically on the upper end face of the fixed plate 20. The telescopic rods 22 extend upward and pass through the rotating plate 19. The movable end of the telescopic rod 22 is fixedly connected to the bottom of the annular plate 28. A second spring 24 is also sleeved on the outside of the telescopic rod 22. One end of the second spring 24 is connected to the annular plate 28, and the other end is connected to the fixed end of the telescopic rod 22. The elastic force of the second spring 24 provides support for the annular plate 28, so that it is kept in the middle of the sleeve 21 as much as possible.When gas is injected into the metal cylinder seat 2 to adjust the shape of the welded bellows 9, the connecting rod 11 drives the fixed plate 20 to move vertically. As the fixed plate 20 moves upward, it drives the rotating plate 19 to move synchronously. Simultaneously, the annular plate 28 and the outer ring 31 also move synchronously. During this movement, the second gear 37 meshes with the rack 17 and rotates. The rotation of the four first gears 36 drives the annular rack 29 to rotate. After the deformation state of the welded bellows 9 is adjusted, the annular rack 29 is kept stationary relative to the limiting plate 18, preventing the four first gears 36 from rotating. The four second gears 37 and the rack 17 inside the slide groove 16 form a lock, keeping the annular plate 28 stationary in the vertical direction. When the entire vibration isolator is running, the rotating plate 19 and the fixed plate 20... Both vibrate synchronously in the vertical direction. However, since the annular plate 28 remains stationary, when the sleeve 21 reciprocates in the vertical direction, the limiting bead 30 inside the annular plate 28 slides inside the spiral groove 25 on the circumferential surface of the sleeve 21, which in turn drives the sleeve 21 to rotate along its axial direction. During the rotation of the sleeve 21, the rotating plate 19 will rotate synchronously with it. This will cause a certain misalignment between the rotating plate 19 and the fixed plate 20, reducing the connection area between the first sector notch 23 and the second sector notch 27, thereby increasing the damping effect of the hydraulic damping component. Furthermore, the greater the vibration amplitude of the equipment, the greater the relative rotation angle between the rotating plate 19 and the fixed plate 20, and the greater the damping effect of the hydraulic damping component. This satisfies the vibration reduction of the equipment and also provides a certain degree of protection for the welded bellows 9.

[0036] In the above scheme, when the vibration isolator is in operation, since the rotating plate 19 and the fixed plate 20 are always in a state of relative rotation, and the fixed plate 20 is also equipped with a telescopic rod 22 to support and fix the annular plate 28, the present invention chooses to open an arc-shaped guide groove 26 on the rotating plate 19 corresponding to the rotation trajectory of the telescopic rod 22. When the fixed plate 20 rotates relative to the rotating plate 19, the telescopic rod 22 slides inside the arc-shaped guide groove 26. Of course, the present invention also further limits the size of the first sector notch 23 and the second sector notch 27. The central angle of each first sector notch 23 and the second sector notch 27 is 60°, and the spiral angle of the spiral groove 25 is set to 120°. In the initial state, the limiting bead 30 of the annular plate 28 is located in the middle of the spiral groove 25. When the limiting bead 30 rotates to its top or bottom inside the spiral groove 25, the rotating plate 19 and the fixed plate 20 form a relatively sealed state, and the hydraulic oil cannot pass through the rotating plate 19 and the fixed plate 20. At this time, the load capacity of the hydraulic damping component reaches its maximum limit.

[0037] When the vibration isolator is running, the annular plate 28 needs to remain fixed in the vertical direction. The prerequisite for the annular plate 28 to remain fixed is that the annular rack 29 cannot rotate. In order to keep the annular rack 29 fixed relative to the annular plate 28, the present invention sets the interior of the annular plate 28 into a cavity. The bottom of the annular rack 29 extends into the interior of the annular plate 28 and is integrally connected to a T-shaped seat 34. A pressure ring 35 is fixed inside the annular plate 28 on the inner side of the T-shaped seat 34. Cylinders 38 are installed inside the two oppositely arranged connecting seats 32 along their length. The piston end of each cylinder 38 extends towards the center of the annular plate 28 and is fixedly connected to an arc-shaped extrusion plate 39. The cylinders 38 drive the arc-shaped extrusion plate 39 to move toward the T-shaped seat 34, thereby clamping the T-shaped seat 34 and finally keeping the annular rack 29 fixed. In practical applications, a solenoid valve 5 can be installed on the air inlet 4. The solenoid valve 5 is electrically connected to the cylinder 38. When gas is injected into the metal cylinder seat 2 through the air inlet 4, the solenoid valve 5 is opened first. When the solenoid valve 5 is open, the two cylinders 38 are not started. At this time, the annular plate 28 will move synchronously in the vertical direction with the rotating plate 19 and the fixed plate 20. However, after the deformation state of the welded bellows 9 is adjusted, the solenoid valve 5 is closed. At the same time as the solenoid valve 5 is closed, the cylinder 38 is started. The cylinder 38 drives the arc-shaped extrusion plate 39 to clamp the T-shaped seat 34, so that the annular plate 28 remains fixed in the vertical direction, ensuring that the hydraulic damping components can be put into normal operation during the operation of the vibration isolator.

[0038] In addition, to further improve the vibration isolation performance of the vibration isolator, the present invention can also attach a first spring 15 to the outside of the connecting rod 11. The bottom end of the first spring 15 is connected to the limiting plate 18, and the top end is connected to the bottom of the metal cylinder seat 2. During operation, the vibration isolator can also absorb vibration through the connecting rod 11.

[0039] In the description of this invention, the terms "first," "second," "another," and "yet another" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of embodiments of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A welded bellows air spring vibration isolator, comprising a metal cylinder base (2), characterized in that: It also includes a welded bellows (9) disposed inside the metal cylinder seat (2) and concentrically therewith. The top and bottom of the welded bellows (9) are respectively connected to the upper flange (12) and the lower flange (13) of the welded bellows. A support column (7) is concentrically disposed on the inner side of the welded bellows (9). The top of the support column (7) extends upward through the metal cylinder seat (2) and is connected to the upper plate (3) of the support column. The bottom of the support column (7) extends downward through the lower flange (13) of the welded bellows and is connected to the upper plate (3). There is a support column lower plate (14), a welded bellows upper flange (12) and the top of the inner side of the metal cylinder seat (2) are fixedly connected, the welded bellows lower flange (13) and the support column lower plate (14) are connected, and several guide columns (8) are arranged in the vertical direction inside the metal cylinder seat (2), and all the guide columns (8) are arranged in a ring around the axis of the support column (7). The welded bellows lower flange (13) and the support column lower plate (14) both pass through the guide columns (8) and are sleeved on the guide columns (8); Limiters (10) are respectively fitted at the middle and bottom of the circumferential surface of the guide post (8). The limiters (10) are used to limit the deformation of the welded bellows (9). It also includes a hydraulic damping component located at the bottom of the metal cylinder base (2); The hydraulic damping component includes a hydraulic cylinder (6) installed at the bottom of the metal cylinder seat (2). The hydraulic cylinder (6) is filled with hydraulic oil. A connecting rod (11) is connected vertically at the center of the bottom of the support column lower plate (14). The connecting rod (11) extends axially downward through the metal cylinder seat (2) and the outer cylinder (1) to the inside of the hydraulic cylinder (6). After the connecting rod (11) extends into the inside of the hydraulic cylinder (6), a fixing plate (20) is connected horizontally at its bottom. Several first sector-shaped notches (23) are opened on the surface of the fixing plate (20). A limiting plate (18) is formed on the circumferential surface of the connecting rod (11) near its bottom. A sleeve (21) is rotatably sleeved between the limiting plate (18) and the fixed plate (20) on the outside of the connecting rod (11). A rotating plate (19) of the same specification as the fixed plate (20) is fixedly connected to the bottom of the sleeve (21). The rotating plate (19) is attached to the upper end face of the fixed plate (20). The rotating plate (19) has a second fan-shaped notch (27) distributed in a ring on its surface, which matches the number of the first fan-shaped notch (23). The first fan-shaped notch (23) and the second fan-shaped notch (27) have the same specifications. During the operation of the vibration isolator, the rotating plate (19) rotates relative to the fixed plate (20) to change the communication area between the first fan-shaped notch (23) and the second fan-shaped notch (27). A circular ring plate (28) is sleeved on the outside of the sleeve (21). An outer ring (31) is concentrically arranged on the outside of the circular ring plate (28). The circular ring plate (28) and the outer ring (31) are connected and fixed by four connecting seats (32). A cylinder (38) is installed inside the two opposite connecting seats (32) along its length. The piston end of each cylinder (38) extends towards the center of the circular ring plate (28) and is fixedly connected to an arc-shaped extrusion plate (39). The arc-shaped extrusion plate (39) is driven by the cylinder (38) to move towards the T-shaped seat (34), thereby clamping the T-shaped seat (34). An air inlet (4) is provided on the outer wall of the metal cylinder seat (2). 4) An electromagnetic valve (5) is installed on it. The electromagnetic valve (5) and the cylinder (38) are electrically connected. When gas is injected into the metal cylinder seat (2) through the air inlet (4), the electromagnetic valve (5) is opened first. When the electromagnetic valve (5) is opened, the two cylinders (38) are not started. At this time, the annular plate (28) will move synchronously with the rotating plate (19) and the fixed plate (20) in the vertical direction. However, after the deformation state of the welded bellows (9) is adjusted, the electromagnetic valve (5) is closed. At the same time as the electromagnetic valve (5) is closed, the cylinder (38) is started. The cylinder (38) drives the arc-shaped extrusion plate (39) to clamp the T-shaped seat (34) so ​​that the annular plate (28) remains fixed in the vertical direction.

2. The welded bellows air spring vibration isolator according to claim 1, characterized in that: The inner side of the ring plate (28) is integrally connected with the limiting bead (30), and the circumferential surface of the sleeve (21) is provided with a spiral groove (25) that matches the diameter of the limiting bead (30) along its axial direction. In the initial state, the ring plate (28) is located in the middle of the sleeve (21). When the load capacity of the welded bellows (9) is adjusted, the ring plate (28) remains stationary relative to the sleeve (21), and the two move synchronously in the vertical direction. When the vibration isolator is running, the ring plate (28) remains stationary in the vertical direction, and the sleeve (21) rotates along its own axial direction when it moves in the vertical direction through the cooperation of the limiting bead (30) and the spiral groove (25).

3. The welded bellows air spring vibration isolator according to claim 2, characterized in that: A fixing rod is fixed inside the connecting seat (32) along its length. One end of the fixing rod extends toward the center of the annular plate (28), passes through the connecting seat (32), and is fixedly sleeved with the first gear (36). The other end extends toward the inner wall of the hydraulic cylinder (6), passes through the connecting seat (32), and is fixedly sleeved with the second gear (37). A ring rack (29) is concentrically mounted on the upper end of the annular plate (28). The ring rack (29) meshes with the four first gears (36). The inner wall of the hydraulic cylinder (6) is formed with a groove (16) corresponding to the position of each second gear (37), and the groove (16) is T-shaped. The fixing rod extends into the groove (16) and then is fitted with the second gear (37). The groove (16) is also fixed with a rack (17) that meshes with the second gear (37) in the vertical direction. The inner cavity of the ring plate (28) is hollow. The bottom of the ring toothed rack (29) extends into the inner cavity of the ring plate (28) and is integrally connected to the T-shaped seat (34). The inner cavity of the ring plate (28) is fixed with a pressure ring (35) located inside the T-shaped seat (34).

4. The welded bellows air spring vibration isolator according to claim 3, characterized in that: Two telescopic rods (22) are fixed vertically on the upper surface of the fixed plate (20). The telescopic rods (22) extend upward and pass through the rotating plate (19). The movable end of the telescopic rods (22) is fixedly connected to the bottom of the ring plate (28). A second spring (24) is also sleeved on the outside of the telescopic rods (22). One end of the second spring (24) is connected to the ring plate (28), and the other end is connected to the fixed end of the telescopic rods (22). The elastic force of the second spring (24) provides support for the ring plate (28). An arc-shaped guide groove (26) is provided on the rotating plate (19) on the rotation trajectory corresponding to the telescopic rods (22).

5. The welded bellows air spring vibration isolator according to claim 4, characterized in that: The first spring (15) is sleeved on the outside of the connecting rod (11). The bottom end of the first spring (15) is connected to the limiting plate (18), and the top end is connected to the bottom of the metal cylinder seat (2).

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