Self-locking type hydraulic multi-stage supporting leg oil cylinder

Abstract

The utility model relates to the technical field of hydraulic support oil cylinders, in particular to a self-locking type hydraulic multi-stage support oil cylinder which comprises a cylinder barrel, a cylinder bottom, a piston rod set and a cylinder body flange, the cylinder body flange is located on the outer side of the cylinder barrel and fixedly connected with the cylinder barrel, one end of the cylinder barrel is in threaded connection with the cylinder bottom, and the piston cylinder set slides in the cylinder barrel along the axis of the piston cylinder set. The piston rod set comprises a last-stage piston rod, a first inserting hole for the limiting shaft to be inserted is formed in the end, close to the cylinder bottom, of the last-stage piston rod, a first embedding groove is formed in the inner wall of the first inserting hole, and a first fastener is arranged in the first embedding groove. A first clamping groove matched with the first fastening piece is formed in the outer wall of the limiting shaft, a chamfer is arranged at the end, away from the cylinder bottom, of the limiting shaft, and the first fastening piece is of an open annular structure. The method has the effects of reducing energy consumption and reducing cost.

Description

Technical Field

[0001] This application relates to the technical field of hydraulic outrigger cylinders, and particularly to a self-locking hydraulic multi-stage outrigger cylinder. Background Art

[0002] Currently, outrigger cylinders are mostly used in various engineering vehicles, and most of the usage scenarios are inverted installation. When working on uneven or unstable ground, the outrigger cylinders adjust the horizontal position of the equipment through telescoping to ensure its stability and safety.

[0003] The related technology can refer to the Chinese patent with the publication number CN202673830U, which discloses an inverted outrigger cylinder, including a cylinder body, a piston rod, a connecting guide sleeve, a piston rod assembly, a balance valve, a rod chamber oil circuit, and a rodless chamber oil circuit. The bottom of the cylinder body is connected to the outrigger seat, the connecting guide sleeve is fixed on the mainframe crossbeam, the cylinder head is fixed at the opening of the cylinder body, the cylinder body is inside the connecting guide sleeve, the piston rod assembly is inside the cylinder body, one end of the piston rod is connected to the connecting guide sleeve through a connecting pin, the piston at the other end of the piston rod is inside the cylinder body, there are rod chamber oil circuit and rodless chamber oil circuit inside the piston rod, the oil inlets of the rod chamber oil circuit and the rodless chamber oil circuit are arranged at the top of the piston rod outside the cylinder head of the cylinder body, the oil inlets of the rod chamber oil circuit and the rodless chamber oil circuit at the top of the piston rod are respectively connected to hydraulic locks, a balance valve is arranged on the rod chamber oil circuit on the upper part of the piston rod, and the oil outlets of the rod chamber oil circuit and the rodless chamber oil circuit are respectively arranged on both sides of the piston.

[0004] In view of the above related technology, when the piston rod contracts inside the cylinder, it will drop due to the influence of gravity and is controlled by using the form of a hydraulic lock. However, when the hydraulic lock works, the system needs to maintain a certain pressure to keep the lock closed, which will increase the energy consumption of the system. The use of a hydraulic lock will increase the cost of the system, including component cost, installation cost, and possible maintenance cost. Summary of the Utility Model

[0005] In order to reduce energy consumption and cost, this application provides a self-locking hydraulic multi-stage outrigger cylinder.

[0006] This application provides a self-locking hydraulic multi-stage outrigger cylinder, adopting the following technical solutions:

[0007] A self-locking hydraulic multi-stage outrigger cylinder, comprising a cylinder barrel, a cylinder bottom, a piston rod group and a cylinder flange. The cylinder flange is located outside the cylinder barrel and fixedly connected to the cylinder barrel. One end of the cylinder barrel is threadedly connected to the cylinder bottom. The piston cylinder group slides in the cylinder barrel along its own axis. A limiting shaft is provided at one end of the cylinder bottom close to the cylinder barrel. The piston rod group includes a last-stage piston rod. A first jack for inserting the limiting shaft is opened at one end of the last-stage piston rod close to the cylinder bottom. A first embedding groove is opened on the inner wall of the first jack. A first fastener is provided in the first embedding groove. A first clamping groove adapted to the first fastener is opened on the outer wall of the limiting shaft. A chamfer is provided at one end of the limiting shaft away from the cylinder bottom. The first fastener is an open annular structure.

[0008] By adopting the above technical solution, a limiting shaft is arranged at the cylinder bottom, and a hole is machined at one end of the last-stage piston rod close to the cylinder bottom and a first fastener is added. When the last-stage piston rod retracts to the position of the cylinder bottom, the first fastener in the last-stage piston rod continuously expands along the chamfer surface of the limiting shaft until it is clamped into the first clamping groove of the limiting shaft. At this time, the piston rod is locked. When the rodless cavity of the cylinder is pressurized, the first fastener in the last-stage piston rod is pushed out of the limiting shaft clamping groove, and the last-stage piston rod of the cylinder extends, releasing the locked state. Without hydraulic control, the cylinder itself can achieve the self-locking function, thereby reducing the energy consumption of the system, and reducing the component cost, installation cost and possible maintenance cost.

[0009] Optionally, a second jack is opened at one end of the cylinder bottom close to the last-stage piston rod. One end of the limiting shaft away from the last-stage piston rod is inserted into the second jack. A second embedding groove is opened on the inner wall of the second jack. A second fastener is provided in the second embedding groove. A second clamping groove adapted to the second fastener is opened on the outer wall of the limiting shaft. A chamfer is provided at one end of the limiting shaft away from the last-stage piston rod. The second fastener is an open annular structure.

[0010] By adopting the above technical solution, the limiting shaft is inserted into the cylinder bottom, and the limiting shaft is fixed to the cylinder bottom through the second fastener. When problems such as wear occur to the limiting shaft after long-term use and it cannot be locked with the last-stage piston rod through the first fastener, the limiting shaft can be pulled out of the cylinder bottom, which is convenient for the maintenance, repair and replacement of the limiting shaft, and improves the simplicity of operation.

[0011] Optionally, the piston rod group further includes a first-stage piston rod. The first-stage piston rod is located in the cylinder barrel and sleeved outside the last-stage piston rod. The first-stage piston rod is slidably connected to the cylinder barrel and the last-stage piston rod along its own axis.

[0012] By adopting the above technical solution, the first-stage piston rod is slidably connected to the cylinder barrel in the cylinder barrel, and the last-stage piston rod is slidably connected to the first-stage piston rod in the first-stage piston rod, realizing the multi-stage telescoping of the cylinder. This design enables the cylinder to achieve a longer stroke in a smaller installation space.

[0013] Optionally, a first limiting ring is fixedly provided on the outer side wall of the end of the last-stage piston rod close to the cylinder bottom. Two third embedding grooves are provided on the inner wall of the first-stage piston rod, and the two third embedding grooves are respectively located at both ends of the first limiting ring. A third fastener is provided in the third embedding groove, and the third fastener is an open annular structure.

[0014] By adopting the above technical solution, when the last-stage piston rod extends outwards, the third fastener far from the cylinder bottom realizes the limitation of the last-stage piston rod by blocking the first limiting ring. When the last-stage piston rod contracts inwards, the last-stage piston rod abuts against the third fastener close to the cylinder bottom. At this time, the last-stage piston rod can drive the first-stage piston rod to contract inwards, and at the same time, the last-stage piston rod can also be limited, enhancing the overall coordination of the oil cylinder structure.

[0015] Optionally, a second limiting ring is fixedly provided on the outer side wall of the end of the first-stage piston rod close to the cylinder bottom. The third fastener is located between the end of the cylinder barrel far from the cylinder bottom and the second limiting ring. A fourth embedding groove is provided on the inner wall of the end of the cylinder barrel far from the cylinder bottom, and a fourth fastener is provided in the fourth embedding groove. The fourth fastener is an open annular structure.

[0016] By adopting the above technical solution, when the first-stage piston rod extends outwards, the fourth fastener realizes the limitation of the first-stage piston rod by blocking the second limiting ring, preventing it from extending excessively, and improving the stability and safety of the oil cylinder in the working state.

[0017] Optionally, a ball head groove is provided at the end of the last-stage piston rod far from the cylinder bottom. A rotating ball head is provided in the ball groove. A positioning pin shaft is inserted at the end of the rotating ball head far from the last-stage piston rod. A ball head seat abuts against the end of the rotating ball head far from the last-stage piston rod. The end of the positioning pin shaft far from the rotating ball head is inserted into the ball head seat, and a ball head pad is clamped between the ball head seat and the last-stage piston rod.

[0018] By adopting the above technical solution, the ball head seat drives the rotating ball head to rotate in the ball groove, which can adapt to different terrains and improve the flexibility and stability of the outrigger oil cylinder.

[0019] Optionally, a fifth embedding groove is provided on the inner wall of the ball head groove close to the abutting plate. A fifth fastener is provided in the fifth embedding groove, and the fifth fastener is an open annular structure.

[0020] By adopting the above technical solution, the fifth fastener can effectively prevent the rotating ball head from disengaging from the ball head groove, improve the stability of the rotating ball head, and ensure the safety of the outrigger oil cylinder when working on uneven or unstable ground.

[0021] Optionally, a first dust-proof ring is provided on the inner wall of the end of the cylinder barrel away from the cylinder bottom. The outer side wall of the first dust-proof ring is embedded in the inner wall of the cylinder barrel, and the inner side wall of the first dust-proof ring abuts against the first-stage piston rod. A second dust-proof ring is provided on the inner wall of the end of the first-stage piston rod away from the cylinder bottom. The outer side wall of the second dust-proof ring is embedded in the inner wall of the first-stage piston rod, and the inner side wall of the second dust-proof ring abuts against the last-stage piston rod.

[0022] By adopting the above technical solution, when the oil cylinder contracts, the first dust-proof ring and the second dust-proof ring can block dust and other impurities on the outer walls of the first-stage piston rod and the last-stage piston rod outside the oil cylinder, reducing the wear during the movement of the piston rod, thereby prolonging the service life of the oil cylinder.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. A limit shaft is provided at the cylinder bottom. A hole is machined at the end of the last-stage piston rod close to the cylinder bottom and a first fastener is added. When the last-stage piston rod retracts to the cylinder bottom position, the first fastener in the last-stage piston rod expands continuously along the chamfered surface of the limit shaft until it snaps into the first card slot of the limit shaft, and at this time the piston rod is locked; when the rodless cavity of the oil cylinder is pressurized, the first fastener in the last-stage piston rod is pushed out of the limit shaft card slot, and the last-stage piston rod of the oil cylinder extends, releasing the locked state. Without hydraulic control, the oil cylinder itself can achieve a self-locking function, thereby reducing the energy consumption of the system, lowering the component cost, installation cost, and possible maintenance cost;

[0025] 2. The limit shaft is inserted into the cylinder bottom and fixed to the cylinder bottom through a second fastener. When problems such as wear occur to the limit shaft during long-term use and it cannot be locked with the last-stage piston rod through the first fastener, the limit shaft can be pulled out of the cylinder bottom, facilitating the maintenance, servicing, and replacement of the limit shaft, and improving the simplicity of operation;

[0026] 3. The first-stage piston rod is slidably connected to the cylinder barrel within the cylinder barrel, and the last-stage piston rod is slidably connected to the first-stage piston rod within the first-stage piston rod, realizing the multi-stage telescoping of the oil cylinder. This design enables the oil cylinder to achieve a longer stroke within a smaller installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an overall structural schematic diagram of a self-locking hydraulic multi-stage outrigger oil cylinder.

[0028] Figure 2 is a cross-sectional schematic diagram of the overall structure of a self-locking hydraulic multi-stage outrigger oil cylinder.

[0029] Figure 3 is Figure 1 an enlarged schematic diagram of part A in

[0030] Figure 4 It is a structural schematic diagram of the first, second, third, fourth, and fifth fasteners.

[0031] Figure 5 is Figure 1 an enlarged schematic diagram of part B in

[0032] Figure 6 is Figure 1 an enlarged schematic diagram of part C in

[0033] Explanation of reference numerals: 1. Cylinder barrel; 11. Fourth fastener; 2. Cylinder bottom; 21. Second jack; 22. Second fastener; 3. Piston rod group; 31. Last-stage piston rod; 311. First jack; 312. First fastener; 313. First limit ring; 314. Ball head groove; 315. Fifth fastener; 32. First-stage piston rod; 321. Third fastener; 322. Second limit ring; 4. Limit shaft; 5. Rotating ball head; 51. Positioning pin shaft; 52. Ball head seat; 53. Ball head pad; 6. First dust ring; 7. Second dust ring; 8. Cylinder block flange. Specific embodiments

[0034] The following further describes the present application in detail with reference to all the drawings.

[0035] The embodiment of the present application discloses a self-locking hydraulic multi-stage outrigger cylinder.

[0036] Referring to Figure 1 , a self-locking hydraulic multi-stage outrigger cylinder includes a cylinder barrel 1, a cylinder bottom 2, a piston rod group 3, and a cylinder block flange 8. The cylinder block flange 8 is located outside the cylinder barrel 1 and fixedly connected to the cylinder barrel 1. The cylinder block flange is used to connect the cylinder and the vehicle body. One end of the cylinder barrel 1 is threadedly connected to the cylinder bottom 2, and the piston cylinder group slides in the cylinder barrel 1 along its own axis.

[0037] Referring to Figure 2 , the piston rod group 3 includes a first-stage piston rod 32 and a last-stage piston rod 31. The first-stage piston rod 32 is located in the cylinder barrel 1 and sleeved outside the last-stage piston rod 31. The first-stage piston rod 32 is slidably connected to the cylinder barrel 1 in the cylinder barrel 1, and the last-stage piston rod 31 is slidably connected to the first-stage piston rod 32 in the first-stage piston rod 32, realizing the multi-stage telescoping of the cylinder. This design enables the cylinder to achieve a longer stroke in a smaller installation space.

[0038] Referring to Figure 2 and Figure 3, one end of the lowermost piston rod 31 close to the cylinder bottom 2 is provided with a first jack 311, one end of the cylinder bottom 2 close to the lowermost piston rod 31 is provided with a second jack 21, a first embedding groove is arranged on the inner wall of the first jack 311, a second embedding groove is arranged on the inner wall of the second jack 21, and the first clamping groove and the second clamping groove are annular grooves. Both the first jack 311 and the second jack 21 are cylindrical holes, and the precision requirements are achieved by mechanical processing means.

[0039] Refer to Figure 3 and Figure 4 , a first fastener 312 is arranged in the first embedding groove, a second fastener 22 is arranged in the second embedding groove, and the first fastener 312 and the second fastener 22 are open annular structures. The first fastener 312 and the second fastener 22 are the same, both having good elasticity and wear resistance. The first fastener 312 and the second fastener 22 can be wire snap rings, which are made of high-strength spring steel wires.

[0040] Refer to Figure 2 and Figure 3 , one end of the cylinder bottom 2 close to the cylinder barrel 1 is provided with a replaceable limiting shaft 4, and the limiting shaft 4 can adopt a cylindrical steel shaft. First clamping grooves and second clamping grooves are arranged on the outer wall of the limiting shaft 4, and both ends of the limiting shaft 4 are respectively inserted into the first jack 311 and the second jack 21. Chamfers are arranged at both ends of the limiting shaft 4 to facilitate the first fastener 312 and the second fastener 22 to slide smoothly along the chamfer surfaces of the limiting shaft 4 into the first clamping groove and the second clamping groove respectively.

[0041] Refer to Figure 2 and Figure 3 , when the lowermost piston rod 31 retracts to the position of the cylinder bottom 2, the first fastener 312 expands continuously along the chamfer surface of the limiting shaft 4 until it snaps into the first clamping groove of the limiting shaft 4. Due to a certain matching relationship between the first clamping groove of the limiting shaft 4 and the first fastener 312, the first fastener 312 is radially limited by the first clamping groove of the limiting shaft 4. At this time, the lowermost piston rod 31 is locked. When the rodless cavity of the oil cylinder is pressurized, the first fastener 312 is disengaged from the first clamping groove of the limiting shaft 4 under the action of pressure, so that the lowermost piston rod 31 can extend smoothly and the locked state is released.

[0042] Refer to Figure 2 and Figure 3 , when problems such as wear occur to the limiting shaft 4 after long-term use, resulting in the inability to lock the lowermost piston rod 31 through the first fastener 312, the limiting shaft 4 can be pulled out from the cylinder bottom 2, which is convenient for the maintenance, upkeep and replacement of the limiting shaft 4 and improves the simplicity of operation.

[0043] Refer to Figure 2 and Figure 5, on the outer side wall of one end of the last-stage piston rod 31 close to the cylinder bottom 2, a first limiting ring 313 is fixedly provided. Two third embedding grooves are formed in the inner wall of the first-stage piston rod 32, and the two third embedding grooves are respectively located at both ends of the first limiting ring 313. A third fastener 321 is arranged in the third embedding groove, and the third fastener 321 is an open annular structure. When the last-stage piston rod 31 extends outwards, the third fastener 321 far from the cylinder bottom 2 limits the last-stage piston rod 31 by blocking the first limiting ring 313. When the last-stage piston rod 31 contracts inwards, the last-stage piston rod 31 abuts against the third fastener 321 close to the cylinder bottom 2. At this time, the last-stage piston rod 31 can drive the first-stage piston rod 32 to contract inwards, and at the same time, the last-stage piston rod 31 can also be limited.

[0044] Refer to Figure 2 and Figure 5 , specifically, the first limiting ring 313 and the last-stage piston rod 31 are integrally formed. A groove is formed in the outer side wall of the first limiting ring 313, and a combined seal is arranged in the groove. The outer wall of the combined seal abuts against the inner wall of the first-stage piston rod 32. Two third embedding grooves are formed in the inner wall of the first-stage piston rod 32, and the third embedding groove is designed as an annular groove. The first limiting ring 313 can only slide between the two third fasteners 321.

[0045] Refer to Figure 2 and Figure 5 , on the outer side wall of one end of the first-stage piston rod 32 close to the cylinder bottom 2, a second limiting ring 322 is fixedly provided. The second limiting ring 322 and the first-stage piston rod 32 are integrally formed. A groove is formed in the outer side wall of the second limiting ring 322, and a combined seal is arranged in the groove. The outer wall of the combined seal abuts against the inner wall of the cylinder barrel 1. The third fastener 321 is located between one end of the cylinder barrel 1 far from the cylinder bottom 2 and the second limiting ring 322. A fourth embedding groove is formed in the inner wall of one end of the cylinder barrel 1 far from the cylinder bottom 2, and a fourth fastener 11 is arranged in the fourth embedding groove. The fourth fastener 11 is an open annular structure. The fourth embedding groove is designed as an annular groove. The fourth fastener 11 has good elasticity and wear resistance. The fourth fastener 11 can be a wire retaining ring and is made of high-strength spring steel wire. When the first-stage piston rod 32 extends outwards, the fourth fastener 11 limits the first-stage piston rod 32 by blocking the second limiting ring 322, preventing it from extending excessively, and improving the stability and safety of the oil cylinder in the working state.

[0046] Refer to Figure 2 and Figure 6, at one end of the lowermost piston rod 31 away from the cylinder bottom 2, a ball head groove 314 is formed. A rotating ball head 5 is arranged in the ball groove. At one end of the rotating ball head 5 away from the lowermost piston rod 31, a positioning pin shaft 51 is inserted. At one end of the rotating ball head 5 away from the lowermost piston rod 31, a ball head seat 52 is abutted. The end of the positioning pin shaft 51 away from the rotating ball head 5 is inserted into the ball head seat 52. A ball head gasket 53 is clamped between the ball head seat 52 and the lowermost piston rod 31. The ball head gasket 53 is a rubber washer, which has elasticity and flexibility. The ball head gasket 53 can recover naturally in the initial state to avoid jamming between the ball head gasket 53 and the rotating ball head 5.

[0047] Refer to Figure 4 and Figure 6 , on the inner wall of one end of the ball head groove 314 close to the abutting plate, a fifth embedding groove is formed. A fifth fastener 315 is arranged in the fifth embedding groove. The fifth fastener 315 is an open annular structure, and the fifth embedding groove is designed as an annular groove. The fifth fastener 315 has good elasticity and wear resistance. The fifth fastener 315 can be a wire retaining ring, which is made of high-strength spring steel wire.

[0048] Refer to Figure 2 and Figure 6 , on the inner wall of one end of the cylinder barrel 1 away from the cylinder bottom 2, a first dust-proof ring 6 is arranged. The outer side wall of the first dust-proof ring 6 is embedded in the inner wall of the cylinder barrel 1, and the inner side wall of the first dust-proof ring 6 abuts against the first-stage piston rod 32. On the inner wall of one end of the first-stage piston rod 32 away from the cylinder bottom 2, a second dust-proof ring 7 is arranged. The outer side wall of the second dust-proof ring 7 is embedded in the inner wall of the first-stage piston rod 32, and the inner side wall of the second dust-proof ring 7 abuts against the lowermost piston rod 31. When the oil cylinder contracts, the first dust-proof ring 6 and the second dust-proof ring 7 can block dust and other impurities on the outer walls of the first-stage piston rod 32 and the lowermost piston rod 31 outside the oil cylinder.

[0049] The implementation principle of a self-locking hydraulic multi-stage outrigger oil cylinder in an embodiment of the present application is as follows: a limiting shaft 4 is arranged at the cylinder bottom 2. A hole is drilled at one end of the lowermost piston rod 31 close to the cylinder bottom 2 and a first fastener 312 is added. When the lowermost piston rod 31 retracts to the position of the cylinder bottom 2, the first fastener 312 in the lowermost piston rod 31 continuously expands along the chamfer surface of the limiting shaft 4 until it is stuck in the first card slot of the limiting shaft 4. At this time, the piston rod is locked. When the rodless cavity of the oil cylinder is pressurized, the first fastener 312 in the lowermost piston rod 31 is pushed out of the card slot of the limiting shaft 4, and the lowermost piston rod 31 of the oil cylinder extends, releasing the locked state. Without hydraulic control, the oil cylinder itself can achieve a self-locking function, thereby reducing the energy consumption of the system, lowering the component cost, installation cost, and possible maintenance cost.

[0050] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A self-locking hydraulic multi-stage outrigger cylinder, comprising a cylinder barrel (1), a cylinder bottom (2), a piston rod group (3) and a cylinder flange (8). The cylinder flange (8) is located outside the cylinder barrel (1) and fixedly connected to the cylinder barrel (1). One end of the cylinder barrel (1) is threadedly connected to the cylinder bottom (2). The piston cylinder group slides in the cylinder barrel (1) along its own axis, and is characterized in that: One end of the cylinder bottom (2) close to the cylinder barrel (1) is provided with a limiting shaft (4). The piston rod group (3) includes the last-stage piston rod (31). One end of the last-stage piston rod (31) close to the cylinder bottom (2) is provided with a first jack (311) for the limiting shaft (4) to be inserted into. The inner wall of the first jack (311) is provided with a first embedding groove, and a first fastener (312) is arranged in the first embedding groove. A first clamping groove adapted to the first fastener (312) is arranged on the outer wall of the limiting shaft (4). One end of the limiting shaft (4) away from the cylinder bottom (2) is provided with a chamfer, and the first fastener (312) is an open annular structure.

2. The self-locking hydraulic multi-stage outrigger cylinder according to claim 1, wherein: One end of the cylinder bottom (2) close to the last-stage piston rod (31) is provided with a second jack (21). One end of the limiting shaft (4) away from the last-stage piston rod (31) is inserted into the second jack (21). The inner wall of the second jack (21) is provided with a second embedding groove, and a second fastener (22) is arranged in the second embedding groove. A second clamping groove adapted to the second fastener (22) is arranged on the outer wall of the limiting shaft (4). One end of the limiting shaft (4) away from the last-stage piston rod (31) is provided with a chamfer, and the second fastener (22) is an open annular structure.

3. A self-locking hydraulic multi-stage outrigger cylinder according to claim 1, characterized in that: The piston rod group (3) further includes a first-stage piston rod (32). The first-stage piston rod (32) is located in the cylinder barrel (1) and sleeved outside the last-stage piston rod (31). The first-stage piston rod (32) is slidably connected to the cylinder barrel (1) and the last-stage piston rod (31) along its own axis.

4. A self-locking hydraulic multi-stage outrigger cylinder according to claim 3, characterized in that: A first limiting ring (313) is fixedly arranged on the outer side wall of one end of the last-stage piston rod (31) close to the cylinder bottom (2). Two third embedding grooves are arranged in the inner wall of the first-stage piston rod (32). The two third embedding grooves are respectively located at both ends of the first limiting ring (313). A third fastener (321) is arranged in the third embedding groove, and the third fastener (321) is an open annular structure.

5. A self-locking hydraulic multi-stage outrigger cylinder according to claim 3, characterized in that: A second limiting ring (322) is fixedly arranged on the outer side wall of one end of the first-stage piston rod (32) close to the cylinder bottom (2). The third fastener (321) is located between one end of the cylinder barrel (1) away from the cylinder bottom (2) and the second limiting ring (322). A fourth embedding groove is arranged in the inner wall of one end of the cylinder barrel (1) away from the cylinder bottom (2). A fourth fastener (11) is arranged in the fourth embedding groove, and the fourth fastener (11) is an open annular structure.

6. A self-locking hydraulic multi-stage outrigger cylinder according to claim 1, characterized in that: A ball head groove (314) is arranged at one end of the last-stage piston rod (31) away from the cylinder bottom (2). A rotating ball head (5) is arranged in the ball groove. A positioning pin shaft (51) is inserted into one end of the rotating ball head (5) away from the last-stage piston rod (31). A ball head seat (52) abuts against one end of the rotating ball head (5) away from the last-stage piston rod (31). One end of the positioning pin shaft (51) away from the rotating ball head (5) is inserted into the ball head seat (52). A ball head pad (53) is clamped between the ball head seat (52) and the last-stage piston rod (31).

7. A self-locking hydraulic multi-stage outrigger cylinder according to claim 6, characterized in that: A fifth embedding groove is arranged in the inner wall of one end of the ball head groove (314) close to the abutting plate. A fifth fastener (315) is arranged in the fifth embedding groove, and the fifth fastener (315) is an open annular structure.

8. A self-locking hydraulic multi-stage outrigger cylinder according to claim 4, characterized in that: The inner wall of one end of the cylinder barrel (1) away from the cylinder bottom (2) is provided with a first dust-proof ring (6). The outer side wall of the first dust-proof ring (6) is embedded in the inner wall of the cylinder barrel (1), and the inner side wall of the first dust-proof ring (6) abuts against the first-stage piston rod (32). The inner wall of one end of the first-stage piston rod (32) away from the cylinder bottom (2) is provided with a second dust-proof ring (7). The outer side wall of the second dust-proof ring (7) is embedded in the inner wall of the first-stage piston rod (32), and the inner side wall of the second dust-proof ring (7) abuts against the last-stage piston rod (31).

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