Modularized hydraulic oil cylinder capable of being quickly disassembled and assembled

Abstract

The invention relates to the technical field of hydraulic oil cylinder disassembly and assembly, and discloses a modularized quick disassembly and assembly type hydraulic oil cylinder which comprises an oil cylinder, a sealing cover is in threaded connection with an opening in the top of the oil cylinder, a push rod is detachably connected into the sealing cover, one end of the push rod is detachably connected with a piston, the sealing cover comprises a cover shell, and a threaded groove is formed in the outer side of the cover shell. Sealing pieces are arranged on the inner side and the outer side of the cover shell, a dismounting piece is arranged at the end of the cover shell and comprises a sliding column connected into the cover shell in a sliding mode, the inner end of the sliding column is fixedly connected with a first magnetic ball, and the outer end of the sliding column is fixedly connected with an outer expansion arc plate. The external expansion arc plates are circumferentially distributed, a telescopic sleeve plate is arranged between the two external expansion arc plates, and a plurality of connecting springs are arranged in the telescopic sleeve plate. In the invention, the modular disassembly and assembly are realized through magnetic linkage and mechanical clamping, the rapid disassembly and assembly of the oil cylinder core assembly can be completed without complex tools, and the maintenance and replacement efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder disassembly and assembly technology, and in particular to a modular quick-disassembly hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders, as core actuators that convert hydraulic energy into mechanical energy, are widely used in engineering machinery (such as excavator bucket drives and crane luffing mechanisms), metallurgical equipment (such as rolling mill pressing devices and continuous casting machine crystallizer vibration systems), mining machinery (such as hydraulic drive components for mining crushers), and industrial automated production lines (such as heavy material handling robotic arms) due to their advantages of simple structure, large output force, and smooth movement. In these applications, hydraulic cylinders need to withstand high pressure, heavy loads, and frequent reciprocating motion for extended periods. Their core components (pistons, push rods, sealing structures, etc.) are prone to failure due to wear, hydraulic oil contamination, or seal failure. Regular maintenance, component replacement, or overhaul is necessary to ensure the continuous and stable operation of the entire equipment.

[0003] In existing technologies, traditional hydraulic cylinders are mostly designed with integrated or semi-integrated connections. The cylinder barrel and end cover are typically connected and fixed by flange bolts or welding, while the piston and push rod are usually connected by threads or rigidly fixed by pins. The seals are embedded in the sealing grooves of the cylinder barrel or end cover through interference fit. In actual assembly and maintenance, it is necessary to first use special tools such as wrenches and screwdrivers to remove the flange bolts or welded points to separate the cylinder barrel and end cover, then use tools to disassemble the threaded or pin connection between the piston and push rod, and finally remove and replace the faulty component.

[0004] However, relying on a variety of specialized tools during the disassembly and assembly process can make the operation steps cumbersome, especially in field or confined space operation scenarios such as construction machinery and mining machinery, where the carrying and operating space of tools are limited, resulting in low disassembly and assembly efficiency.

[0005] Therefore, to address the aforementioned problems, a modular, quick-assembly hydraulic cylinder is proposed. Summary of the Invention

[0006] To overcome the above shortcomings, the present invention provides a modular quick-disassembly hydraulic cylinder, which aims to improve the problem of low disassembly and assembly efficiency caused by the reliance on multiple special tools in the disassembly and assembly process of traditional hydraulic cylinders in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A modular quick-assembly hydraulic cylinder includes a cylinder, a cover threadedly connected to the top opening of the cylinder, a push rod detachably connected inside the cover, and a piston detachably connected to one end of the push rod.

[0009] The cover includes a cover shell, the outer side of which is provided with a threaded groove, the inner and outer sides of which are provided with sealing elements, and the end of the cover shell is provided with a disassembly element.

[0010] The disassembly and assembly components include a sliding column slidably connected inside the cover shell, a magnetic ball fixedly connected to the inner end of the sliding column, and an outer arc plate fixedly connected to the outer end of the sliding column. The outer arc plates are circumferentially distributed and a telescopic sleeve plate is provided between the two outer arc plates. Multiple connecting springs are provided inside the telescopic sleeve plate, and the two ends of the connecting springs are respectively connected to the adjacent ends of the two outer arc plates.

[0011] As a further description of the above technical solution:

[0012] The sealing element includes an outer sealing ring and an inner sealing ring. The outer sealing ring is sleeved on the outside of the cover shell, and the inner sealing ring is set in the annular groove on the inside of the cover shell. The inside of the cover shell is also provided with two limiting rings, namely a first limiting ring and a second limiting ring, to prevent the push rod from shaking.

[0013] As a further description of the above technical solution:

[0014] The push rod includes a rod body, the outer side of which is slidably connected to the inner side of the cover and in contact with the inner sealing ring, the first limiting ring and the second limiting ring. The outer side of the rod body is provided with a plurality of magnetic strips with the same outer magnetism as the inner magnetism of the magnetic ball one, and the rod body is fixedly connected to a mating end at one end inside the oil cylinder.

[0015] As a further description of the above technical solution:

[0016] The piston includes a docking cylinder, which is detachably connected to one end of the cap and the docking end is detachably connected to the inside of the docking cylinder. A rubber ring is provided on the outside of the docking cylinder, and a limiting cavity is provided at the center of the inside of the docking cylinder. A return spring is provided inside the limiting cavity. A support push plate is fixedly connected to the outer end of the return spring, and a docking component is rotatably connected to the other side of the support push plate.

[0017] As a further description of the above technical solution:

[0018] The docking component includes a docking baffle. The outer groove shape of the docking baffle is adapted to the shape of the docking end. Six inclined extension plates are provided on the outer side of the docking baffle, and telescopic columns are fixedly connected inside the inclined extension plates. The other end of the telescopic column is fixedly connected to a magnetic ball two with the opposite magnetic properties to the bottom of the magnetic ball one.

[0019] As a further description of the above technical solution:

[0020] The bottom of the docking cylinder is provided with a locking groove, the shape of which is adapted to the shape of the docking baffle and the obliquely extended plate that is distributed in a circle on its outer side.

[0021] As a further description of the above technical solution:

[0022] The outer side of the docking cylinder is provided with multiple spherical locking grooves, and the shape of the spherical locking grooves is adapted to the shape of the magnetic ball.

[0023] As a further description of the above technical solution:

[0024] The other end of the cylinder is provided with a mounting ring one, and the other end of the push rod is provided with a mounting ring two. The outer side of the cylinder is provided with an oil inlet and an air outlet.

[0025] The present invention has the following beneficial effects:

[0026] 1. In this invention, the piston docking cylinder and the cap are pre-docked together, and the magnetic ball two and magnetic ball one are attracted together to achieve initial fixation. When the push rod is inserted, the magnetic strip and magnetic ball two are used to release the pre-fixation. Then, the push rod and the piston are connected by the engagement of the inclined extension plate and the locking groove. When disassembling, the push rod is rotated in the opposite direction to unlock. The reset spring pushes the piston back to its original position and re-docks with the cap. The piston can be removed as a whole by rotating the cap. Thus, modular disassembly and assembly are achieved through magnetic linkage and mechanical engagement. The core components of the hydraulic cylinder can be quickly disassembled and assembled without complicated tools, which greatly improves the efficiency of maintenance and replacement.

[0027] 2. In this invention, an initial seal is formed by the sealing outer ring and sealing inner ring on the inner and outer sides of the cover; when the push rod is installed, the outer expansion plate and the telescopic sleeve expand outward under the action of magnetic repulsion and contact the inner wall of the cylinder, and the rubber ring enhances the sealing effect; during disassembly and assembly, the engagement of the magnetic ball with the spherical locking groove and the expansion of the outer expansion plate always keep the connection parts tightly fitted, so that even in the transition stage of component separation and assembly, the sealing structure can continue to play a role, ensuring that the cylinder maintains good sealing performance throughout the entire disassembly and assembly process and avoiding hydraulic oil leakage. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of a modular quick-assembly hydraulic cylinder proposed in this invention;

[0029] Figure 2 This is a schematic diagram of the structure of a modular quick-assembly hydraulic cylinder proposed in this invention;

[0030] Figure 3 This is a schematic diagram of the structure of a cover for a modular, quick-assembly hydraulic cylinder proposed in this invention.

[0031] Figure 4 This is a schematic diagram of the disassembly and assembly components of a modular quick-disassembly hydraulic cylinder proposed in this invention;

[0032] Figure 5This is a schematic diagram of the push rod structure of a modular quick-assembly hydraulic cylinder proposed in this invention;

[0033] Figure 6 This is a schematic diagram of the piston structure of a modular quick-assembly hydraulic cylinder proposed in this invention;

[0034] Figure 7 This is a schematic diagram of the docking cylinder of a modular quick-assembly hydraulic cylinder proposed in this invention;

[0035] Figure 8 for Figure 4 Enlarged view of point A in the middle;

[0036] Figure 9 for Figure 6 Enlarged view of point B in the middle.

[0037] Legend:

[0038] 1. Hydraulic cylinder; 2. Mounting ring one; 3. Cover; 31. Cover shell; 32. Threaded groove; 33. Seal; 331. Sealing outer ring; 332. Limiting ring one; 333. Sealing inner ring; 334. Limiting ring two; 34. Disassembly / assembly parts; 341. Sliding column; 342. Magnetic ball one; 343. Outer arc plate; 344. Telescopic sleeve plate; 345. Connecting spring; 346. Spherical snap-fit ​​groove; 4. Push rod; 401. Rod body; 402. Magnetic strip; 403. Connecting end; 5. Mounting ring two; 6. Piston; 61. Connecting cylinder; 62. Rubber ring; 63. Connecting parts; 631. Connecting baffle; 632. Telescopic column; 633. Magnetic ball two; 64. Support push plate; 65. Return spring; 66. Locking groove; 67. Limiting cavity. Detailed Implementation

[0039] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Reference Figures 1 to 9This invention provides an embodiment of a modular, quick-assembly hydraulic cylinder 1, comprising a cylinder 1, which serves as the main space for storing hydraulic oil and the movement of a piston 6, providing the foundation for the entire device's installation and operation. A cap 3 is threadedly connected to the top opening of the cylinder 1, sealing the top opening and providing a mounting and pre-connection carrier for the push rod 4 and piston 6. The push rod 4 is detachably connected inside the cap 3, transmitting hydraulic driving force and realizing the transmission of internal and external forces within the cylinder 1. A piston 6 is detachably connected to one end of the push rod 4, reciprocating within the cylinder 1 according to changes in hydraulic oil pressure, thus changing the internal volume of the cylinder 1. A mounting ring 2 is provided at the other end of the cylinder 1, securing the cylinder 1 to external equipment and ensuring the stability of the cylinder 1 during operation. A second mounting ring 5 is provided at the other end of the push rod 4, connecting the push rod 4 to external actuators for easy transmission of driving force. Furthermore, the outer side of the cylinder 1 is provided with an oil inlet and an air outlet. The oil inlet is used to inject hydraulic oil into the cylinder 1 to provide a power source for the movement of the piston 6, and the air outlet is used to balance the air pressure inside the cylinder 1 to prevent air pressure from hindering the movement of the piston 6.

[0041] The cover 3 includes a cover shell 31, which serves as the main frame of the cover 3 and provides installation support for all components of the cover 3. A threaded groove 32 is provided on the outer side of the cover shell 31, which is used to achieve a threaded connection between the cover shell 31 and the top opening of the cylinder 1, ensuring the stability of the connection between the cover 3 and the cylinder 1. Sealing elements 33 are provided on both the inner and outer sides of the cover shell 31, which are used to achieve sealing between the cover shell 31 and the cylinder 1, and between the cover shell 31 and the push rod 4, preventing hydraulic oil leakage. Furthermore, a disassembly / removal component 34 is provided at the end of the cover shell 31, which assists in the pre-connection and release of the piston 6 and the cover 3, while also enhancing the sealing effect between the cover 3 and the cylinder 1.

[0042] The sealing element 33 includes an outer sealing ring 331 and an inner sealing ring 333. The outer sealing ring 331 is fitted onto the outside of the cover shell 31 and fills the gap between the cover shell 31 and the top opening of the cylinder 1, achieving an initial seal between the cover shell 31 and the cylinder 1. The inner sealing ring 333 is disposed in an annular groove on the inner side of the cover shell 31 and fills the gap between the cover shell 31 and the push rod 4, achieving an initial seal between the cover shell 31 and the push rod 4. Furthermore, two limiting rings, a first limiting ring 332 and a second limiting ring 334, are provided on the inner side of the cover shell 31 to prevent the push rod 4 from shaking. The first limiting ring 332 and the second limiting ring 334 together restrict the movement trajectory of the push rod 4, preventing the push rod 4 from deviating during sliding and ensuring the coaxiality of the push rod 4's movement.

[0043] The disassembly / assembly component 34 includes a sliding column 341 slidably connected inside the cover shell 31. The sliding column 341 drives the magnetic ball 342 and the outer expansion plate 343 to move, realizing the pre-connection of the piston 6 and the cover 3 and the expansion of the outer expansion plate 343. The inner end of the sliding column 341 is fixedly connected to the magnetic ball 342. The magnetic ball 342 achieves the pre-connection of the piston 6 and the cover 3 through the attraction force with the magnetic ball 633. The engagement with the spherical locking groove 346 enhances the stability of the pre-connection. At the same time, the repulsive force with the magnetic strip 402 assists the expansion of the outer expansion plate 343. The outer expansion plate 343 is fixedly connected to the outer end of the sliding column 341. The outer expansion plate 343 is circumferentially distributed. Under the action of the sliding column 341, the outer expansion plate 343 expands outward and contacts the inside of the cylinder 1, further enhancing the sealing effect between the cover 3 and the cylinder 1. Furthermore, a telescopic sleeve 344 is provided between the two outwardly expanding arc plates 343. The telescopic sleeve 344 is used to fill the gap between adjacent outwardly expanding arc plates 343 to prevent leaks in the seal. Multiple connecting springs 345 are provided inside the telescopic sleeve 344. The two ends of the connecting springs 345 are respectively connected to the adjacent ends of the two outwardly expanding arc plates 343. The connecting springs 345 provide elastic force for the reset of the outwardly expanding arc plates 343, while ensuring the synchronicity and stability of the outwardly expanding arc plates 343 during expansion.

[0044] The push rod 4 includes a rod body 401, which serves as the main body of the push rod 4, providing mounting support for its various components and enabling sliding and force transmission. The outer side of the rod body 401 is slidably connected to the inner side of the cover 3 and contacts the inner sealing ring 333, the first limiting ring 332, and the second limiting ring 334, ensuring sealing and stability during sliding. Multiple magnetic strips 402, with the same outer magnetic properties as the inner magnetic properties of the first magnetic ball 342, are provided on the outer side of the rod body 401. These magnetic strips 402, through repulsion with the second magnetic ball 633, push the second magnetic ball 633 to move, assisting in releasing the pre-connection between the piston 6 and the cover 3 and pushing the outer expansion plate 343 to expand. Furthermore, a docking end 403 is fixedly connected to one end of the rod body 401 inside the cylinder 1. The docking end 403 engages with the groove of the docking baffle 631, achieving initial engagement between the push rod 4 and the piston 6, laying the foundation for subsequent locking.

[0045] The piston 6 includes a docking cylinder 61, which serves as the main frame of the piston 6, providing installation space for the various components of the piston 6 and facilitating pre-dating of the piston 6 with the cap 3 and connection with the push rod 4. The docking cylinder 61 is detachably connected to one end of the cap 3, and the docking end 403 is detachably connected to the inside of the docking cylinder 61, ensuring the detachability of the piston 6 with the cap 3 and the push rod 4. A rubber ring 62 is provided on the outer side of the docking cylinder 61 to fill the gap between the docking cylinder 61 and the inner wall of the cylinder 1, enhancing the sealing effect between the piston 6 and the cylinder 1. A limiting cavity 67 is provided at the center of the interior of the docking cylinder 61, providing installation and movement space for the return spring 65 and the support push plate 64. The return spring 65 is provided inside the limiting cavity 67, providing elastic force for the return of the support push plate 64, pushing the docking baffle 631 back to its initial position, facilitating the re-pre-dating of the piston 6 with the cap 3. A support push plate 64 is fixedly connected to the outer end of the return spring 65. The support push plate 64 supports the docking piece 63 and transmits the elastic force of the return spring 65 and the thrust of the docking end 403. The docking piece 63 is rotatably connected to the other side of the support push plate 64. The docking piece 63 is used to connect and lock the push rod 4 and the piston 6.

[0046] The docking component 63 includes a docking baffle 631. The outer groove shape of the docking baffle 631 is adapted to the shape of the docking end 403, and is used to cooperate with the docking end 403 to achieve initial engagement between the push rod 4 and the piston 6. Six inclined extension plates are provided on the outer side of the docking baffle 631. The inclined extension plates are used to cooperate with the locking groove 66 to achieve stable locking between the push rod 4 and the piston 6. Furthermore, a telescopic column 632 is fixedly connected inside the inclined extension plate. The telescopic column 632 is used to support the second magnetic ball 633, and can extend and retract with the movement of the second magnetic ball 633 to ensure the cooperation between the second magnetic ball 633, the first magnetic ball 342, and the locking groove 66. The other end of the telescopic column 632 is fixedly connected to a magnetic ball 633 with the opposite magnetic properties to the bottom of the magnetic ball 342. The magnetic ball 633 achieves pre-connection between the piston 6 and the cover 3 through the attraction force with the magnetic ball 342, and assists the expansion of the outer arc plate 343 through the repulsion force with the magnetic strip 402. At the same time, the locking stability between the push rod 4 and the piston 6 is enhanced by the abutment with the inner wall of the locking groove 66. The bottom of the docking cylinder 61 is provided with a locking groove 66. The shape of the locking groove 66 is adapted to the shape of the docking baffle 631 and the obliquely extended plate distributed in a circle on its outer side. It is used to cooperate with the obliquely extended plate to achieve stable locking of the push rod 4 and the piston 6, and prevent the push rod 4 and the piston 6 from separating during operation. Multiple spherical locking grooves 346 are provided on the outer side of the docking cylinder 61, and the shape of the spherical locking grooves 346 is adapted to the shape of the magnetic ball 342. They are used to engage with the magnetic ball 342 to enhance the stability of the pre-dock between the piston 6 and the cap 3 and prevent the piston 6 from separating from the cap 3 in the pre-dock state.

[0047] Working principle: First, the piston 6's docking cylinder 61 is aligned with the end of the cap 3 and inserted. At this time, the return spring 65 in the piston 6's limiting cavity 67 is in its natural state. The support push plate 64 pushes the docking baffle 631 of the docking part 63 to the front end of the docking cylinder 61, so that the magnetic ball 2 633 on the six oblique extension plates on the outside of the docking baffle 631 is precisely aligned with the magnetic ball 1 342 at the inner end of the sliding column 341 in the cap 3 disassembly part 34. Since the magnetic balls 2 633 and 1 342 have opposite magnetic properties at their bottoms, they generate an attraction force, which drives the sliding column 341 to move into the cap 31 until the magnetic ball 1 342 is inserted into the spherical locking groove 346 on the outside of the docking cylinder 61, realizing a stable pre-dock between the piston 6 and the cap 3. At the same time, the sealing parts 33 (sealing outer ring 331 and sealing inner ring 333) on both sides of the cap 3 cap 3 maintain the initial sealing state.

[0048] After the piston 6 and the cover 3 are pre-connected, the cover 3 is rotated and screwed into the top opening of the cylinder 1 through the threaded groove 32 on the outside of the cover 31, so that the cover 3 and the cylinder 1 are initially fixed. At this time, the first limiting ring 332 and the second limiting ring 334 on the inner side of the cover 3 are in the ready-to-work state, and the oil inlet and air outlet on the outside of the cylinder 1 are kept unobstructed.

[0049] When installing push rod 4, insert push rod 401 from the outside of cover 3. The outside of push rod 401 contacts the inner sealing ring 333, limit ring 1 332 and limit ring 2 334 on the inside of cover 3. The cooperation of the three achieves guidance and anti-shaking. The docking end 403 of push rod 4 initially engages with the outer groove of docking baffle 631 in piston 6 docking part 63. Continue to push push rod 4, docking end 403 squeezes docking baffle 631 to make it move backward, supporting push plate 64 to compress the return spring 65 in limiting cavity 67.

[0050] As the docking baffle 631 moves backward, the magnetic ball 633 and the magnetic ball 342 gradually become misaligned, and the attraction between them gradually decreases. When the docking baffle 631 approaches the bottom of the docking cylinder 61, the attraction disappears completely. At this time, the magnetic strip 402 on the outside of the push rod 4 (the outer magnetism is the same as the inner magnetism of the magnetic ball 342) generates a repulsive force with the magnetic ball 633, pushing the magnetic ball 633 to drive the telescopic column 632 and the sliding column 341 to move outward. The outer arc plate 343 at the outer end of the sliding column 341 then expands outward. The telescopic sleeve plate 344 between the two outer arc plates 343 extends synchronously under the action of the connecting spring 345, so that the outer arc plate 343 and the telescopic sleeve plate 344 expand outward in a ring until they contact the inside of the oil cylinder 1, further strengthening the sealing effect.

[0051] When the docking baffle 631 reaches the deepest part of the docking cylinder 61, the push rod 4 is rotated, and the rod body 401 drives the docking baffle 631 to rotate synchronously, so that the oblique extension plate on the outer side of the docking baffle 631 is inserted into the locking groove 66 at the bottom of the docking cylinder 61. At the same time, the telescopic column 632 pushes the magnetic ball 633 to abut against the inner wall of the locking groove 66, forming a stable lock, and completing the docking of the push rod 4 and the piston 6 inside the cylinder 1. At this time, the cooperation between the sealing element 33 and the outer arc plate 343 ensures the integrity of the overall seal.

[0052] During the dismantling operation, first rotate the push rod 4 in the opposite direction to rotate the docking baffle 631, causing the inclined extension plate to slide out of the locking groove 66, releasing the locking state between the push rod 4 and the piston 6. Then, pull the push rod 4 outward, and the rod body 401 gradually exits the cover 3. The repulsive force of the magnetic strip 402 on the second magnetic ball 633 decreases accordingly, and the attractive force between the second magnetic ball 633 and the first magnetic ball 342 gradually recovers.

[0053] After push rod 4 is fully retracted, piston 6 moves forward under the elastic force of return spring 65, docking baffle 631 returns to the front end position inside docking cylinder 61, magnetic ball 2 633 aligns with magnetic ball 1 342 again, the adsorption force reaches its maximum, causing magnetic ball 1 342 to re-enter the spherical locking groove 346, piston 6 and cover 3 return to the pre-connected state, at this time it can be removed from cylinder 1 by rotating cover 3, piston 6 is taken out along with cover 3, completing the entire modular disassembly and assembly process, during which the mounting ring 1 2 at the other end of cylinder 1 and the mounting ring 2 5 at the other end of push rod 4 always remain separable from the external structure.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular quick-assembly hydraulic cylinder (1), comprising a cylinder (1), characterized in that: A cover (3) is threadedly connected to the top opening of the cylinder (1). A push rod (4) is detachably connected inside the cover (3). A piston (6) is detachably connected to one end of the push rod (4). The cover (3) includes a cover shell (31), a threaded groove (32) is provided on the outer side of the cover shell (31), a sealing element (33) is provided on the inner and outer sides of the cover shell (31), and a disassembly part (34) is provided at the end of the cover shell (31). The disassembly / assembly component (34) includes a sliding column (341) slidably connected inside the cover (31). A magnetic ball (342) is fixedly connected to the inner end of the sliding column (341), and an outer arc plate (343) is fixedly connected to the outer end of the sliding column (341). The outer arc plates (343) are circumferentially distributed, and a telescopic sleeve plate (344) is provided between the two outer arc plates (343). Multiple connecting springs (345) are provided inside the telescopic sleeve plate (344), and the two ends of the connecting springs (345) are respectively connected to the adjacent ends of the two outer arc plates (343).

2. The modular quick-assembly hydraulic cylinder (1) according to claim 1, characterized in that: The sealing element (33) includes an outer sealing ring (331) and an inner sealing ring (333). The outer sealing ring (331) is fitted on the outside of the cover (31), and the inner sealing ring (333) is set in the annular groove on the inside of the cover (31). The inner side of the cover (31) is also provided with two limiting rings, namely a first limiting ring (332) and a second limiting ring (334), for preventing the push rod (4) from shaking.

3. The modular quick-assembly hydraulic cylinder (1) according to claim 1, characterized in that: The push rod (4) includes a rod body (401), the outer side of which is slidably connected to the inner side of the cover (3) and in contact with the inner sealing ring (333), the first limiting ring (332) and the second limiting ring (334). The outer side of the rod body (401) is provided with a plurality of magnetic strips (402) whose outer magnetic properties are the same as those of the inner magnetic ball (342). The rod body (401) is fixedly connected to a mating end (403) at one end inside the oil cylinder (1).

4. A modular quick-assembly hydraulic cylinder (1) according to claim 3, characterized in that: The piston (6) includes a docking cylinder (61), which is detachably connected to one end of the cover (3) and the docking end (403) is detachably connected to the inside of the docking cylinder (61). A rubber ring (62) is provided on the outside of the docking cylinder (61). A limiting cavity (67) is provided at the center of the inside of the docking cylinder (61), and a return spring (65) is provided inside the limiting cavity (67). A support push plate (64) is fixedly connected to the outer end of the return spring (65), and a docking piece (63) is rotatably connected to the other side of the support push plate (64).

5. A modular quick-assembly hydraulic cylinder (1) according to claim 4, characterized in that: The docking component (63) includes a docking baffle (631). The outer groove shape of the docking baffle (631) is adapted to the shape of the docking end (403). Six oblique extension plates are provided on the outer side of the docking baffle (631), and a telescopic column (632) is fixedly connected inside the oblique extension plate. The other end of the telescopic column (632) is fixedly connected to a magnetic ball (633) with the opposite magnetic properties to the bottom of the magnetic ball (342).

6. A modular quick-assembly hydraulic cylinder (1) according to claim 5, characterized in that: The bottom of the docking cylinder (61) is provided with a locking groove (66), the shape of which is adapted to the docking baffle (631) and the circumferentially distributed oblique extension plate on its outer side.

7. A modular quick-assembly hydraulic cylinder (1) according to claim 4, characterized in that: The outer side of the docking cylinder (61) is provided with a plurality of spherical snap-fit ​​grooves (346), and the shape of the spherical snap-fit ​​grooves (346) is adapted to the shape of the magnetic ball (342).

8. A modular quick-assembly hydraulic cylinder (1) according to claim 1, characterized in that: The other end of the oil cylinder (1) is provided with a mounting ring one (2), and the other end of the push rod (4) is provided with a mounting ring two (5). The oil cylinder (1) is provided with an oil inlet and an air outlet on its outer side.

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