Air cylinder lifting device

Abstract

The embodiment of the invention provides an air cylinder lifting device, and belongs to the field of railway engineering trucks, the air cylinder lifting device comprises an air cylinder mounting bottom plate, an arc-shaped groove cylinder seat and a lifting device, an arc-shaped structure of a groove provides multi-point contact support in the air cylinder lifting process, axial movement of an air cylinder is restrained through a limiting plate, and the air cylinder is prevented from inclining or sliding due to gravity or external force. The fixed connection of the lifting device and the air cylinder mounting bottom plate ensures that the driving force is directly transmitted to the air cylinder mounting bottom plate, and the stability of the lifting process is improved. And the gap design between the arc-shaped groove cylinder seat and the air cylinder mounting bottom plate further prevents friction between the air outlet of the air cylinder and the bottom plate, and the equipment damage risk is reduced. According to the technical means, through structural adaptability optimization, the safety and efficiency of air cylinder installation are remarkably improved, meanwhile, the multifunctionality of the device is expanded through modular design, and stable and reliable air cylinder lifting operation can be achieved in different installation scenes.

Description

Technical Field

[0001] This application relates to the field of railway engineering vehicles, and more particularly to a pneumatic cylinder lifting device. Background Technology

[0002] During the maintenance and manufacturing of railway engineering vehicles, critical components such as air cylinders often need to be installed at the bottom of the car body. Because the overhaul platforms of railway cranes, locomotives, and other equipment are typically designed to be at a low height, cranes cannot directly lift the air cylinders to the designated position at the bottom of the car body. In this case, the air cylinders are lifted from the ground to the bottom of the car body for installation.

[0003] In existing operations, lifting platforms are typically designed with a concave surface to limit the movement of the air cylinders.

[0004] However, the air outlet at the bottom of the air cylinder is prone to friction with the platform during transportation, which poses a risk of wear and affects the performance and service life of the equipment. Summary of the Invention

[0005] This application provides a cylinder lifting device to address the risk of wear.

[0006] In a first aspect, embodiments of this application provide a cylinder lifting device, comprising:

[0007] Air cylinder mounting base plate;

[0008] At least one arc-shaped groove cylinder seat is disposed on the air cylinder mounting base plate; the arc-shaped groove cylinder seat is provided with a groove suitable for accommodating the air cylinder; the bottom of the groove is at a first height from the air cylinder mounting base plate;

[0009] A lifting device is provided, which is connected to the air cylinder mounting base plate, and the lifting device drives the air cylinder mounting base plate to move in the height direction.

[0010] In one possible implementation, the first height is greater than or equal to 30 mm and less than or equal to 50 mm.

[0011] In one possible implementation, when there are multiple arc-shaped groove cylinder seats, the multiple arc-shaped groove cylinder seats are spaced apart along the axial direction of the air cylinder.

[0012] In one possible implementation, the air cylinder mounting base plate is provided with a plurality of adjustment holes; the plurality of adjustment holes are arranged along the axial direction of the air cylinder, and air cylinders of different lengths can be adapted through the adjustment holes; it also includes:

[0013] A fixing plate is fixed to the arc-shaped groove cylinder seat on one side, and the fixing plate is connected to the adjustment hole by bolts.

[0014] In one possible implementation, the adjustment hole is a strip-shaped hole; the adjustment hole extends along the axial direction of the air cylinder.

[0015] In one possible implementation, it also includes:

[0016] A rubber layer is disposed between the arc-shaped groove cylinder seat and the air cylinder.

[0017] In one possible implementation, the lifting device includes:

[0018] At least two primary support structures;

[0019] At least two second support structures, the number of which corresponds to the number of the first support structures, and the middle part of the corresponding second support structure is hinged to the middle part of the first support structure;

[0020] The first connecting rod has two ends connected to the two first support structures, respectively, near the ends of the arc-shaped groove cylinder seat; the first connecting rod is provided with threaded holes;

[0021] The second connecting rod has two ends connected to the ends of the second support structure near the arc-shaped groove cylinder seat; the second connecting rod is provided with through holes;

[0022] A threaded rod has a threaded portion on its outer surface, forming a threaded section. The threaded section passes through a threaded hole on the connecting rod and is threadedly connected to the first connecting rod. A portion of the threaded rod passes through the through hole and is connected to the second connecting rod. During rotation, the threaded rod drives the first connecting rod to move closer to or away from the second connecting rod.

[0023] In one possible implementation, the lifting device further includes:

[0024] A rocker arm is connected to the end of the threaded rod away from the second connecting rod; the rocker arm drives the threaded rod to rotate.

[0025] In one possible implementation, it also includes:

[0026] A movable seat, wherein the lifting device is mounted on the movable seat;

[0027] A plurality of movable wheels are disposed at the bottom of the movable base; the movable base moves by means of the movable wheels.

[0028] In one possible implementation, the end of the second connecting rod away from the arc-shaped groove cylinder seat is provided with a slide rail on one side and a slider on the other side; the end of the second connecting rod away from the arc-shaped groove cylinder seat is slidably connected to the moving seat through the slider and the slide rail.

[0029] This application provides a cylinder lifting device, including a cylinder mounting base plate, an arc-shaped groove cylinder seat, and a lifting device. The arc-shaped structure of the groove provides multi-point contact support during cylinder lifting. A limiting plate constrains the axial movement of the cylinder, preventing tilting or sliding due to gravity or external forces. The fixed connection between the lifting device and the cylinder mounting base plate ensures that the driving force is directly transmitted to the base plate, improving the stability of the lifting process. The gap design between the arc-shaped groove cylinder seat and the cylinder mounting base plate further prevents friction between the cylinder outlet and the base plate, reducing the risk of equipment damage. This technology significantly improves the safety and efficiency of cylinder installation through structural adaptability optimization. Simultaneously, modular design (such as the detachable arc-shaped groove cylinder seat) expands the device's versatility, enabling stable and reliable cylinder lifting operations in various installation scenarios. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 A schematic diagram of the overall structure of a cylinder lifting device provided in this application;

[0032] Figure 2 A schematic diagram of a lifting device for a cylinder lifting device provided in this application;

[0033] Figure 3 A schematic diagram of the air cylinder mounting base plate of an air cylinder lifting device provided in this application.

[0034] Figure label:

[0035] 10. Air cylinder; 100. Air cylinder mounting base plate; 110. Adjustment hole;

[0036] 200. Arc-shaped groove cylinder seat; 210. Groove;

[0037] 300. Lifting device; 310. First support structure; 320. Second support structure; 330. First connecting rod; 340. Second connecting rod; 350. Threaded rod; 360. Rocker arm;

[0038] 400. Fixing plate;

[0039] 500. Movable seat; 510. Movable wheels;

[0040] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0042] This application discloses a cylinder lifting device specifically designed for railway engineering vehicle maintenance, particularly suitable for cylinder installation operations within the confined space under the vehicle body. The device utilizes a lightweight metal frame structure (square tube, rectangular tube, steel plate, etc.), allowing for flexible movement via bottom guide rails and wheels. Manual operation with a joystick eliminates the need for an external power source. The cylinder mounting base adapts to the cylinder's cylindrical structure using an arc-shaped groove and rubber protective layer, preventing friction damage to the air outlet. The scissor-arm lifting mechanism achieves smooth lifting through the linkage of a screw and bearing, adapting to operational needs within a 500mm height range. This device can be used as a standalone unit or integrated with a material storage platform to meet diverse on-site requirements.

[0043] In existing technologies, general-purpose lifting devices are not optimized for the cylindrical structure of the air cylinder, making it prone to tilting or sliding during lifting. This requires manual fixing by workers, impacting efficiency. Furthermore, hydraulic or electric drive systems rely on precision components (such as motors and hydraulic pumps), resulting in high equipment costs, complex maintenance, and inconvenient operation in confined spaces. Additionally, the air cylinder outlet is in direct contact with the platform, making it susceptible to damage due to friction, and existing devices lack specific protective measures. For example, in scenarios where the vehicle body repair platform is low, workers must manually move the air cylinder within a limited space, resulting in high labor intensity and low efficiency.

[0044] Starting from the existing technical problems, the applicant provides a cylinder lifting device to solve the aforementioned issues. This device includes a cylinder mounting base plate, an arc-shaped groove cylinder seat, and a lifting device. The arc-shaped structure of the groove provides multi-point contact support during cylinder lifting. A limiting plate constrains the axial movement of the cylinder, preventing tilting or sliding due to gravity or external forces. The fixed connection between the lifting device and the cylinder mounting base plate ensures that the driving force is directly transmitted to the base plate, improving the stability of the lifting process. The gap design between the arc-shaped groove cylinder seat and the cylinder mounting base plate further prevents friction between the cylinder outlet and the base plate, reducing the risk of equipment damage. This technical approach significantly improves the safety and efficiency of cylinder installation through structural adaptability optimization. Simultaneously, modular design (such as the detachable arc-shaped groove cylinder seat) expands the device's versatility, enabling stable and reliable cylinder lifting operations in various installation scenarios.

[0045] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0046] like Figure 1 and Figure 2 As shown, this application embodiment provides a lifting device for a cylinder 10, including a cylinder mounting base plate 100, at least one arc-shaped groove cylinder seat 200, and a lifting device 300. The arc-shaped groove cylinder seat 200 is disposed on the cylinder mounting base plate 100. A groove 210 suitable for accommodating the cylinder 10 is provided in the arc-shaped groove cylinder seat 200. The bottom of the groove 210 is at a first height from the cylinder mounting base plate 100. The lifting device 300 is connected to the cylinder mounting base plate 100, and the lifting device 300 drives the cylinder mounting base plate 100 to move in the height direction.

[0047] like Figure 3 As shown, the air cylinder mounting base plate 100 is a rectangular flat plate structure used to support the air cylinder 10. It is connected to the lifting device 300 by bolts to achieve movement in the height direction.

[0048] It can be made of steel plate or aluminum alloy plate, with adjustment holes 110 or fixing holes on the surface.

[0049] The arc-shaped groove cylinder seat 200 is a structural component welded to the air cylinder mounting base plate 100, and the shape of its groove 210 is adapted to the shape of the air cylinder 10.

[0050] The groove 210 is semi-circular or elliptical, with a gap between its bottom and the base plate 100 for mounting the air cylinder.

[0051] The lifting device 300 is a component that drives the air cylinder mounting base plate 100 to lift via a mechanical structure, and is fixedly connected to the air cylinder mounting base plate 100.

[0052] Examples could be scissor rod structures, hydraulic cylinders, or electric actuators.

[0053] The air cylinder mounting base plate 100 serves as a support platform and is fixedly connected to the lifting device 300 by bolts. The arc-shaped groove cylinder seat 200 is welded to the air cylinder mounting base plate 100, and the shape of its groove 210 completely matches the cylindrical outline of the air cylinder 10, ensuring that the air cylinder 10 will not tilt or slide during the lifting process.

[0054] The lifting device 300 drives the air cylinder mounting base plate 100 to move vertically through mechanical transmission (such as scissor bar, screw, etc.), thereby raising or lowering the air cylinder 10.

[0055] A gap is left between the bottom of the groove 210 of the arc-shaped cylinder seat 200 and the base plate 100 of the air cylinder to prevent the air outlet of the air cylinder 10 from directly contacting the base plate and to prevent friction damage.

[0056] The driving method of the lifting device 300 can be replaced by a hydraulic, electric or manual structure, but the connection relationship between the arc-shaped cylinder seat 200 and the air cylinder mounting base plate 100 remains unchanged.

[0057] The arc-shaped groove cylinder seat 200 solves the technical problem that traditional flat lifting platforms cannot stably fix the air cylinder 10 by adapting the shape of the groove 210 to the shape of the air cylinder 10.

[0058] The arc-shaped structure of the groove 210 provides multi-point contact support during the lifting and lowering of the air cylinder 10. The axial movement of the air cylinder 10 is constrained by the limiting plate, preventing it from tilting or sliding due to gravity or external forces. The fixed connection between the lifting device 300 and the air cylinder mounting base plate 100 ensures that the driving force is directly transmitted to the air cylinder mounting base plate 100, improving the stability of the lifting and lowering process.

[0059] The gap design between the arc-shaped groove cylinder seat 200 and the air cylinder mounting base plate 100 further prevents the air outlet of the air cylinder 10 from rubbing against the base plate, reducing the risk of equipment damage.

[0060] This technology significantly improves the safety and efficiency of air cylinder 10 installation through structural adaptability optimization. At the same time, it expands the versatility of the device through modular design (such as the detachability of the arc-shaped groove cylinder seat 200), enabling it to achieve stable and reliable air cylinder 10 lifting operations in different installation scenarios.

[0061] Furthermore, the first height is greater than or equal to 30mm and less than or equal to 50mm.

[0062] The first height is the vertical distance between the bottom of the groove 210 and the air cylinder mounting base plate 100, used to prevent the air outlet of the air cylinder 10 from directly contacting the base plate.

[0063] It should be noted that the first height can be 30mm to 50mm, and the specific value can be adjusted according to the position of the air outlet of the air cylinder 10.

[0064] The first height design between the bottom of the groove 210 and the air cylinder mounting base plate 100 ensures that the air outlet of the air cylinder 10 will not directly contact the base plate during the lifting and lowering process by reserving space between the arc-shaped groove cylinder seat 200 and the air cylinder mounting base plate 100.

[0065] This design reduces friction through spatial isolation, while utilizing the arc structure of the arc groove to provide multi-point support for the air cylinder 10, thereby improving the stability of the air cylinder 10 during the lifting and lowering process.

[0066] By setting the initial height, direct friction between the air outlet of the air cylinder 10 and the base plate is avoided, thus preventing surface damage to the air cylinder 10. This design ensures the stability of the air cylinder 10 while improving its protective performance, reducing the risk of equipment failure due to friction during installation, and extending the service life of the air cylinder 10.

[0067] Furthermore, when there are multiple arc-shaped groove cylinder seats 200, the multiple arc-shaped groove cylinder seats 200 are spaced apart along the axial direction of the air cylinder 10.

[0068] By increasing the number of arc-shaped groove cylinder seats 200, the support effect on the air cylinder 10 can be further increased. When the air cylinder 10 has a large volume or weight, it is necessary to appropriately increase the number of arc-shaped groove cylinder seats 200.

[0069] In this embodiment, there are two arc-shaped groove cylinder seats 200.

[0070] Furthermore, the air cylinder mounting base plate 100 is provided with a number of adjustment holes 110; the number of adjustment holes 110 are arranged along the axial direction of the air cylinder 10, and air cylinders 10 of different lengths can be adapted through the adjustment holes 110; it also includes a fixing plate 400, one side of the fixing plate 400 is fixed to the arc-shaped groove cylinder seat 200, and the fixing plate 400 is connected to the adjustment holes 110 by bolts.

[0071] The adjusting hole 110 is an elongated hole extending axially along the air cylinder 10, used to adjust the position of the arc-shaped groove cylinder seat 200. For example, the adjusting hole 110 can be a T-slot or a dovetail slot, which mates with the fixing plate 400 with bolts.

[0072] Specifically, the fixing plate 400 is made of steel plate or aluminum alloy plate, and the fixing plate 400 is fixedly connected to the arc-shaped groove cylinder seat 200 by welding.

[0073] The adjustment hole 110 extends along the axial direction of the air cylinder 10, allowing the arc-shaped groove cylinder seat 200 to slide along the adjustment hole 110 via the fixing plate 400 to adapt to air cylinders 10 of different lengths.

[0074] The fixing plate 400 and the adjusting hole 110 are connected by bolts. By rotating the bolts to tighten the fixing plate 400, the precise positioning of the arc-shaped groove cylinder seat 200 is achieved. This design expands the adaptability of the device through a modular structure.

[0075] By adjusting the hole 110 in conjunction with the fixing plate 400, the installation position of the air cylinder 10 can be flexibly adjusted, allowing the device to adapt to air cylinders 10 of different sizes. This design improves the versatility of the device and reduces the problem of equipment being idle or requiring duplicate purchases due to differences in the size of the air cylinder 10.

[0076] Furthermore, it also includes a rubber layer, which is disposed between the arc-shaped groove cylinder and the air cylinder 10.

[0077] Adding a rubber layer can reduce impact stress. When two parts come into contact or collide, the elasticity of the rubber layer can effectively absorb and disperse impact energy.

[0078] This avoids direct, hard-on-hard impacts, transforming concentrated impact forces into more widely distributed, gentler elastic deformation, thereby significantly reducing peak stress and instantaneous wear at the contact point.

[0079] By setting a rubber layer, the impact and wear of the air cylinder 10 when it is placed on the arc-shaped slot cylinder seat 200 can be effectively avoided, thereby increasing the service life of the air cylinder 10.

[0080] Furthermore, the lifting device 300 includes at least two first support structures 310, at least two second support structures 320, a first connecting rod 330, a second connecting rod 340, and a threaded rod 350.

[0081] The number of second support structures 320 corresponds to the number of first support structures 310, and the middle part of the corresponding second support structure 320 is hinged to the middle part of the first support structure 310; the two ends of the first connecting rod 330 are respectively connected to the ends of the two first support structures 310 near the arc-shaped groove cylinder seat 200; the first connecting rod 330 is provided with threaded holes; the two ends of the second connecting rod 340 are respectively connected to the ends of the second support structure 320 near the arc-shaped groove cylinder seat 200; the second connecting rod 340 is provided with through holes;

[0082] A portion of the outer surface of the threaded rod 350 is provided with threads, forming a threaded portion; the threaded portion passes through the threaded hole on the connecting rod and is threadedly connected to the first connecting rod 330; a portion of the threaded rod 350 passes through the through hole and is connected to the second connecting rod 340; during the rotation of the threaded rod 350, it drives the first connecting rod 330 to move closer to or away from the second connecting rod 340.

[0083] The first support structure 310 and the second support structure 320 are hinged at the middle to form a scissor bar structure, and the first connecting rod 330 and the second connecting rod 340 are respectively connected to the two ends of the scissor bar.

[0084] The threaded part of the threaded rod 350 is threadedly engaged with the first connecting rod 330, and the non-threaded part of the threaded rod 350 passes through the through hole of the second connecting rod 340. By rotating the threaded rod 350, the scissor bar is driven to expand or contract, thereby realizing the lifting and lowering of the air cylinder mounting base plate 100.

[0085] The combination of a scissor bar structure and a threaded rod 350 enables manually driven lifting, eliminating the need for an external power source. This design reduces equipment costs and maintenance complexity, while the hinged structure distributes the load, improving the stability and reliability of the device.

[0086] It should be noted that the hinge point between the first support structure 310 and the second support structure 320 is provided with a self-lubricating coating, which can be a graphite-based coating, a PTFE coating, or a molybdenum disulfide coating; and an anti-slip rubber pad is provided on the outside of the hinge point.

[0087] A self-lubricating coating covers the metal surface of the hinge point, reducing frictional loss from direct metal-to-metal contact; anti-slip rubber pads are placed on the outside of the hinge point, increasing friction through elastic deformation to prevent the hinge point from sliding or shifting. The combination of these two elements ensures the stability of the scissor-bar structure.

[0088] The combination of a self-lubricating coating and anti-slip rubber pads reduces wear at the hinge points and prevents slippage, thereby extending the device's lifespan and improving the smoothness of the lifting process.

[0089] Furthermore, the lifting device 300 also includes a rocker arm 360, which is connected to the end of the threaded rod 350 away from the second connecting rod 340; the rocker arm 360 drives the threaded rod 350 to rotate.

[0090] By setting the rocker arm 360, the operator can drive the threaded rod 350 to rotate by turning the rocker arm 360.

[0091] Furthermore, it also includes a movable seat 500 and several movable wheels 510, with the lifting device 300 mounted on the movable seat 500; the several movable wheels 510 are mounted on the bottom of the movable seat 500; the movable seat 500 moves via the movable wheels 510.

[0092] In this embodiment, the movable wheel 510 is specifically selected as a universal wheel, and four of them are provided, respectively located at the four corners of the movable seat 500.

[0093] Furthermore, the end of the second connecting rod 340 away from the arc-shaped groove cylinder seat 200 is provided with a slide rail on one side and a slider on the other side; the end of the second connecting rod 340 away from the arc-shaped groove cylinder seat 200 is slidably connected to the moving seat 500 through the slider and the slide rail.

[0094] The slide rail is a guide rail structure that cooperates with the slider. For example, it can be a linear guide rail or a ball bearing guide rail.

[0095] The slide rail is set on the movable seat 500, and the slider is connected to the second connecting rod 340. The smooth lifting and lowering of the air cylinder mounting base plate 100 is achieved through the cooperation of the slide rail and the slider.

[0096] The cooperation between the slide rail and the slider improves the smoothness of the lifting process, reduces vibration and noise during operation, and enhances the stability of the overall structure.

[0097] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A pneumatic cylinder lifting device, characterized in that, include: Air cylinder mounting base plate (100); At least one arc-shaped groove cylinder seat (200) is disposed on the air cylinder mounting base plate (100); the arc-shaped groove cylinder seat (200) is provided with a groove (210) suitable for accommodating the air cylinder (10); the bottom of the groove (210) is at a first height from the air cylinder mounting base plate (100); A lifting device (300) is connected to the air cylinder mounting base plate (100), and the lifting device (300) drives the air cylinder mounting base plate (100) to move in the height direction.

2. The air cylinder lifting device according to claim 1, characterized in that, The first height is greater than or equal to 30 mm and less than or equal to 50 mm.

3. The air cylinder lifting device according to claim 1, characterized in that, When there are multiple arc-shaped groove cylinder seats (200), the multiple arc-shaped groove cylinder seats (200) are spaced apart along the axial direction of the air cylinder (10).

4. The air cylinder lifting device according to claim 3, characterized in that, The air cylinder mounting base plate (100) is provided with a plurality of adjustment holes (110); the plurality of adjustment holes (110) are arranged along the axial direction of the air cylinder (10), and air cylinders (10) of different lengths can be adapted through the adjustment holes (110); it also includes: A fixing plate (400) is fixed to the arc-shaped groove cylinder seat (200) on one side, and the fixing plate (400) is connected to the adjustment hole (110) by bolts.

5. The air cylinder lifting device according to claim 4, characterized in that, The adjustment hole (110) is a strip-shaped hole; the adjustment hole (110) extends along the axial direction of the air cylinder (10).

6. The air cylinder lifting device according to claim 1, characterized in that, Also includes: A rubber layer is disposed between the arc-shaped groove cylinder seat (200) and the air cylinder (10).

7. The air cylinder lifting device according to any one of claims 1-6, characterized in that, The lifting device (300) includes: At least two first support structures (310); At least two second support structures (320) are provided, the number of which corresponds to the number of the first support structures (310), and the middle part of the corresponding second support structure (320) is hinged to the middle part of the first support structure (310). The first connecting rod (330) has two ends connected to the ends of the two first support structures (310) near the ends of the arc-shaped groove cylinder seat (200); the first connecting rod (330) is provided with threaded holes; The second connecting rod (340) has two ends connected to the ends of the second support structure (320) near the arc-shaped groove cylinder seat (200); the second connecting rod (340) is provided with through holes; A threaded rod (350) has a threaded portion on its outer surface, forming a threaded section. The threaded section passes through a threaded hole on the connecting rod and is threadedly connected to the first connecting rod (330). A portion of the threaded rod (350) passes through the through hole and is connected to the second connecting rod (340). During rotation, the threaded rod (350) drives the first connecting rod (330) to move closer to or away from the second connecting rod (340).

8. The air cylinder lifting device according to claim 7, characterized in that, The lifting device (300) also includes: A rocker arm (360) is connected to the end of the threaded rod (350) away from the second connecting rod (340); the rocker arm (360) drives the threaded rod (350) to rotate.

9. The air cylinder lifting device according to claim 7, characterized in that, Also includes: A movable seat (500), on which the lifting device (300) is mounted; A plurality of movable wheels (510) are provided at the bottom of the movable seat (500); the movable seat (500) moves by means of the movable wheels (510).

10. The air cylinder lifting device according to claim 9, characterized in that, The second connecting rod (340) is provided with a slide rail on one end of the arc-shaped groove cylinder seat (200) and a slider on the other end of the movable seat (500); the second connecting rod (340) is slidably connected to the movable seat (500) through the slider and the slide rail.

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