A high performance double self-locking hydraulic cylinder

Abstract

The present invention discloses a high-performance double self-locking hydraulic cylinder, which relates to the technical field of hydraulic equipment, including a cylinder barrel of the hydraulic cylinder, a piston rod is installed on the cylinder barrel, and an external fixed cover of the cylinder barrel is connected to a protective cylinder, an independent anti-leakage space is formed between the inner wall of the protective cylinder and the outer wall of the cylinder barrel, the anti-leakage space is filled with hydraulic oil, a self-locking mechanism capable of locking the piston rod is fixed in the anti-leakage space, and when the oil pressure borne by the pressure-bearing part increases, the pin part is inserted into the slot structure to complete the locking connection. When the hydraulic cylinder loses pressure, the present invention can automatically lock the depressurized hydraulic cylinder in time, thereby forming a double self-locking of the hydraulic cylinder with the hydraulic valve lock, avoiding the uncontrolled sliding of the piston rod of the oil cylinder in the cylinder barrel body, reducing the risk of accidents caused by the uncontrolled sliding and collision of the piston rod of the hydraulic cylinder, and being beneficial to improving the safety of the hydraulic cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic equipment, in particular to a high-performance double self-locking hydraulic cylinder. Background Art

[0002] Self-locking hydraulic cylinder refers to a hydraulic system that, through a specific design and device, can automatically lock the cylinder in the event of a pressure loss or power outage in the pressure system, preventing the machine or equipment from losing control and causing personal injury or property loss;

[0003] Existing Chinese patent publication number "CN108999832B" is entitled "A self-locking hydraulic cylinder". The patent includes "an outer cylinder, an inner cylinder and a piston rod. A slide groove is provided on the inner wall of the inner cylinder, a self-locking pin is installed in the slide groove, and a self-locking groove matching the self-locking pin is provided on the piston rod; a locking device is also provided in the outer cylinder, the locking device includes a frame, a sprocket chain mechanism and a roller, a clamping plate is slidably connected in the frame, a support rod is slidably connected in the frame, and a rack is provided at one end of the support rod extending out of the frame; the roller abuts against the piston rod, the roller is coaxially connected to one of the sprockets of the sprocket chain mechanism, the other sprocket of the sprocket chain mechanism is coaxially connected to a gear, the gear and the rack on the support rod are meshed with each other, the piston rod of the hydraulic cylinder will retract, the locking device turns on the self-locking protection, the clamping plate clamps and fixes the piston rod radially, thereby overcoming the retraction of the piston rod and keeping the piston rod in the current position for stable operation".

[0004] The locking of the existing hydraulic cylinder is mainly controlled by a hydraulic valve lock, thereby realizing the locking or unlocking control of the oil cylinder. Although the above method can play a locking role, the locking method is single. Once the cylinder barrel of the oil cylinder ruptures and the oil pressure in the cylinder barrel is unbalanced, the locking of the hydraulic valve lock will fail, and the piston rod of the oil cylinder is prone to uncontrolled sliding in the cylinder barrel, thereby posing the risk of accidents caused by uncontrolled sliding of the piston rod of the hydraulic cylinder and collision. In order to solve the above problems, we propose a high-performance double self-locking hydraulic cylinder. Summary of the invention

[0005] The purpose of the present invention is to provide a high-performance double self-locking hydraulic cylinder to solve the deficiencies in the above-mentioned prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A high-performance double self-locking hydraulic cylinder, comprising a cylinder barrel of a hydraulic cylinder, a piston rod being mounted on the cylinder barrel, a protective cylinder being connected to an external fixed cover of the cylinder barrel, an independent anti-leakage space being formed between the inner wall of the protective cylinder and the outer wall of the cylinder barrel, the anti-leakage space being filled with hydraulic oil, a self-locking mechanism being fixed in the anti-leakage space capable of locking the piston rod, the self-locking mechanism comprising;

[0008] The rail plug assembly includes a plurality of isolation cylinders located in the anti-leakage space, the openings of each isolation cylinder are connected to the external atmosphere, and plug posts are adapted to be plugged into the isolation cylinders, and the extended ends of the plug posts are fixed to the same connecting block, and the connecting block is fixed to the piston rod;

[0009] The locking pin assembly includes a slot structure arranged on the plug column, and also includes a latch unit installed in the isolation cylinder. The latch unit includes a pressure-bearing part located in the anti-leakage space, and the latch unit also includes a latch part located in the isolation cylinder. When the oil pressure on the pressure-bearing part increases, the latch part is inserted into the slot structure to complete the locking.

[0010] Preferably, the slot structure comprises an insertion channel located at the insertion end of the plug post, and a ring tooth structure capable of adapting and engaging with the plug pin portion is provided in the insertion channel.

[0011] Preferably, the plug-in channel is a columnar channel space, and a plurality of branch holes communicating with the external atmosphere are provided on the side of the end of the plug-in channel.

[0012] Preferably, the ring tooth structure includes an annular column groove formed on the inner wall surface of the plug-in channel, a sliding sleeve is slidably adapted in the annular column groove, each of the branch holes is located in the annular column groove, and a plurality of annular tooth grooves that can be adapted to engage with the latch part are formed on the inner wall surface of the sliding sleeve, and the sliding sleeve has a blocking position in the annular column groove that can cover the branch holes.

[0013] Preferably, the latch unit further comprises a core tube located in the plug-in channel, the core tube is fixedly passed through the bottom of the isolation tube, and the tube mouth end of the core tube is located in the anti-leakage space.

[0014] Preferably, the pressure-bearing part includes a rod inserted into the core barrel, the rod and the core barrel are sealed by a first elastic rubber film, and when the hydraulic oil pressure in the anti-leakage space increases, the rod moves toward the bottom of the core barrel.

[0015] Preferably, the latch portion includes a plurality of mounting holes opened on the side of the core tube, each of the mounting holes is on the same circular ring line, a pin rod is movably inserted in each of the mounting holes, the pin rod and the mounting hole are connected by a second elastic rubber membrane, and the pin rod can accept the movement of the rod and engage with the ring tooth structure.

[0016] Preferably, one end of the rod extending into the core tube is provided with a wedge-shaped portion, and the wedge-shaped portion can contact the end of the pin rod.

[0017] Preferably, there is a spacing space between the rod insertion end and the bottom wall of the core tube.

[0018] Preferably, an air guide groove is provided on the outer side of the core barrel, the mounting hole is located in the groove body of the air guide groove, and the air guide groove is in a blocked state when the pin rod is engaged with the ring gear structure.

[0019] In the above technical scheme, the present invention provides a high-performance double self-locking hydraulic cylinder, which increases the protection of the cylinder by setting an anti-leakage space filled with hydraulic oil on the outside of the cylinder, and also adds a self-locking mechanism when the cylinder loses pressure. The rail assembly in the self-locking mechanism moves synchronously with the movement of the piston rod under normal conditions. When the cylinder ruptures and loses pressure, the latch part is automatically inserted into the slot structure to complete the locking, thereby locking the movement of the rail assembly, and then the locked rail assembly reversely restricts the movement of the piston rod on the cylinder. When the hydraulic cylinder loses pressure, the depressurized hydraulic cylinder can be automatically locked in time. Therefore, it constitutes a double self-locking of the hydraulic cylinder with the hydraulic valve lock, avoiding the uncontrolled sliding of the piston rod of the oil cylinder in the cylinder body, reducing the risk of accidents caused by the uncontrolled sliding of the piston rod of the hydraulic cylinder and collision, which is beneficial to improving the safety of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a cross-sectional schematic diagram of a high-performance double self-locking hydraulic cylinder of the present invention;

[0022] Figure 2 It is a front cross-sectional schematic diagram of a high-performance double self-locking hydraulic cylinder of the present invention;

[0023] Figure 3 A schematic diagram of a slot structure of a high-performance double self-locking hydraulic cylinder of the present invention;

[0024] Figure 4 A schematic diagram of a latch unit of a high-performance double self-locking hydraulic cylinder of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 It is an overall schematic diagram of a high-performance double self-locking hydraulic cylinder of the present invention;

[0027] Figure 7 It is a partial cross-sectional schematic diagram of a high-performance double self-locking hydraulic cylinder of the present invention;

[0028] Figure 8The present invention is a schematic diagram of the state of the mounting hole of a high-performance double self-locking hydraulic cylinder on the air guide groove.

[0029] Description of reference numerals:

[0030] 1. Cylinder; 2. Piston rod; 3. Protective tube; 4. Anti-leakage space; 5. Rail assembly; 5.1. Isolation tube; 5.2. Insertion column; 5.3. Connecting block; 6. Lock pin assembly; 6.1. Slot structure; 6.11. Insertion channel; 6.12. Ring gear structure; 6.121. Ring column groove; 6.122. Sliding sleeve; 6.123. Ring gear groove; 6.124. Notch; 6.125. Spring; 6.13, branch hole; 6.2, latch unit; 6.21, pressure-bearing portion; 6.211, rod; 6.212, first elastic rubber membrane; 6.22, latch portion; 6.221, mounting hole; 6.222, pin rod; 6.223, second elastic rubber membrane; 6.224, wedge-shaped portion; 6.23, core tube; 6.24, air guide groove; 7, sliding ring; 8, sliding sleeve; 9, sliding ball. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1-8 The embodiment of the present invention provides a high-performance double self-locking hydraulic cylinder, comprising a cylinder barrel 1 of the hydraulic cylinder, a piston rod 2 is mounted on the cylinder barrel 1, a protective cylinder 3 is connected to the external fixed cover of the cylinder barrel 1, an independent anti-leakage space 4 is formed between the inner wall of the protective cylinder 3 and the outer wall of the cylinder barrel 1, the anti-leakage space 4 is filled with hydraulic oil, and a self-locking mechanism capable of locking the piston rod 2 is fixed in the anti-leakage space 4, and the self-locking mechanism includes;

[0033] The plug rail assembly 5 includes a plurality of isolation cylinders 5.1 located in the anti-leakage space 4, the openings of each isolation cylinder 5.1 are connected to the external atmosphere, and a plug post 5.2 is adapted to be plugged into the isolation cylinder 5.1, and the extended ends of the plug post 5.2 are fixed to the same connecting block 5.3, and the connecting block 5.3 is fixed to the piston rod 2;

[0034] The lock pin assembly 6 comprises a slot structure 6.1 arranged on the plug column 5.2, and also comprises a latch unit 6.2 installed in the isolation cylinder 5.1, the latch unit 6.2 comprises a pressure-bearing portion 6.21 located in the anti-leakage space 4, and the latch unit 6.2 also comprises a latch portion 6.22 located in the isolation cylinder 5.1, and when the oil pressure on the pressure-bearing portion 6.21 increases, the latch portion 6.22 is inserted into the slot structure 6.1 to complete the locking;

[0035] Specifically, under normal circumstances, the extension and positioning of the piston rod 2 in the cylinder 1 are controlled by the hydraulic valve lock. The specific principle of the hydraulic valve lock is the existing technology and is not repeated here. The axis of the protective cylinder 3 coincides with the axis of the cylinder 1, the bottom of the cylinder 1 is fixed to the bottom of the protective cylinder 3, the inner top wall of the protective cylinder 3 is sealed and connected to the top surface of the cylinder 1, and the interval space between the inner wall surface of the protective cylinder 3 and the outer wall surface of the cylinder 1 constitutes a sealed and independent anti-leakage space 4. The anti-leakage space 4 is filled with hydraulic oil of the same nature as that in the cylinder 1. The mouth end of the isolation cylinder 5.1 is located outside the anti-leakage space 4, the axis of the isolation cylinder 5.1 is parallel to the axis of the cylinder 1, the mouth of the isolation cylinder 5.1 faces the position of the connecting block 5.3, the block of the connecting block 5.3 is perpendicular to the axis of the rod body of the piston rod 2, and multiple isolation cylinders 5.1 are evenly distributed in a ring shape on the outer circumference of the cylinder 1;

[0036] In actual use, the rail assembly 6 in the self-locking mechanism performs synchronous telescopic movement with the movement of the piston rod under normal conditions. When the cylinder barrel 1 ruptures and loses pressure, the hydraulic oil inside the cylinder barrel 1 enters the anti-leakage space 4, causing the pressure in the anti-leakage space 4 to increase rapidly. At this time, the oil pressure on the pressure-bearing part 6.21 increases and shifts, so that the latch part 6.22 is inserted into the slot structure 6.1 to complete the locking connection, thereby locking the movement of the rail assembly 6, and then the locked rail assembly reversely restricts the movement of the piston rod on the cylinder barrel. Therefore, when the hydraulic cylinder loses pressure, the depressurized hydraulic cylinder can be automatically locked in time, thereby forming a double self-locking of the hydraulic cylinder with the hydraulic valve lock, avoiding the uncontrolled sliding of the piston rod of the oil cylinder in the cylinder body, reducing the risk of accidents caused by the uncontrolled sliding of the piston rod of the hydraulic cylinder and collision, which is beneficial to improving the safety of the hydraulic cylinder.

[0037] In another embodiment provided by the present invention, the slot structure 6.1 includes a plug-in channel 6.11 located at the insertion end of the plug-in column 5.2, and a ring tooth structure 6.12 that can be adapted to mesh with the latch portion 6.22 is provided in the plug-in channel 6.11, wherein the plug-in channel 6.11 is a cylindrical channel space, and a plurality of branch holes 6.13 connected to the external atmosphere are opened on the side of the end of the plug-in channel 6.11, and each branch hole 6.13 is evenly distributed along the circumferential line of the plug-in channel 6.11. In actual use, the piston rod 2 is fixed to the plug-in column 5.2 through the connecting block 5.3. When the piston rod 2 is retracted, the plug-in column 5.2 is inserted into the isolation tube 5.1. At this time, the air in the isolation tube 5.1 enters the plug-in channel 6.11, and then dissipates into the external atmosphere through each branch hole 6.13, thereby keeping the air pressure inside and outside the isolation tube 5.1 consistent when the plug-in column 5.2 is inserted or removed from the isolation tube 5.1.

[0038] In another embodiment provided by the present invention, the ring gear structure 6.12 includes a ring column groove 6.121 provided on the inner wall surface of the plug-in channel 6.11, the axis line of the ring column groove 6.121 coincides with the axis line of the plug-in channel 6.11, and a sliding sleeve 6.122 is slidably adapted in the ring column groove 6.121. The sliding sleeve 6.122 can move in the direction of the axis line of the ring column groove 6.121. The inner wall surface of the sliding sleeve 6.122 is flush with the inner wall surface of the plug-in channel 6.11. Each branch hole 6.13 is located in the ring column groove 6.121, and a plurality of ring tooth grooves 6.123 capable of matching and meshing with the latch portion 6.22 are provided on the inner wall surface of the sliding sleeve 6.122. The center of the ring tooth groove 6.123 is located at the axis line of the ring column groove 6.121. On the upper side, a notch 6.124 is provided in the middle of the sliding sleeve 6.122, and the sliding sleeve 6.122 has a blocking position in the annular column groove 6.121 that can cover the branch hole 6.13, and the sliding sleeve 6.122 has a avoidance position in the annular column groove 6.121 to keep the air flow of the branch hole 6.13 unobstructed; wherein, when the notch 6.124 is connected and communicated with the branch hole 6.13, the sliding sleeve 6.122 is in the avoidance position in the annular column groove 6.121, and the two ends of the sliding sleeve 6.122 are connected to the groove end faces of the corresponding annular column groove 6.121 by springs 6.125, and when the sliding sleeve 6.122 is not subjected to the force of the latch unit 6.2, the sliding sleeve 6.122 is kept in the avoidance position in the annular column groove 6.121;

[0039] During actual use, when the latch portion 6.22 is inserted into the slot structure 6.1, the latch portion 6.22 is inserted into the annular tooth groove 6.123 on the annular tooth structure 6.12. As the plug column 5.2 continues to move linearly along the axial direction, the latch portion 6.22 is inserted into the slot structure 6.1, so that the sleeve 6.122 moves from the avoidance position to the blocking position. At this time, the latch portion 6.22 is inserted into the slot structure 6.1 to complete the locking. At the same time, the branch hole 6.13 is in a blocked state, and the airflow inside and outside the isolation tube 5.1 does not circulate. Therefore, under the action of atmospheric pressure, that is, when the locking pin assembly 6 is in the locked state, the relative movement between the isolation tube 5.1 and the plug column 5.2 is limited by the air pressure, which provides auxiliary force for the locking pin assembly 6 in the locked state, which is beneficial to further improve the stability of the locking pin assembly 6 in the locked state.

[0040] In another embodiment provided by the present invention, the latch unit 6.2 also includes a core tube 6.23 located in the plug-in channel 6.11, the axis of the core tube 6.23 coincides with the axis of the plug-in channel 6.11, the core tube 6.23 is fixedly passed through the bottom of the isolation tube 5.1, the tube mouth end of the core tube 6.23 is located in the anti-leakage space 4, the plug column 5.2 is movably connected to the core tube 6.23 through the plug-in channel 6.11, wherein an air guide groove 6.24 is provided on the outer side of the core tube 6.23, thereby ensuring that the air between the insertion end of the plug column 5.2 and the inner bottom wall of the isolation tube 5.1 can be transferred to the branch hole 6.13 through the air guide groove 6.24, thereby achieving smooth air flow.

[0041] In another embodiment provided by the present invention, the pressure-bearing portion 6.21 includes a rod 6.211 inserted into the core barrel 6.23, the axis of the rod 6.211 coincides with the axis of the core barrel 6.23, one end of the rod 6.211 extends out of the barrel mouth of the core barrel 6.23, the rod 6.211 and the inner wall of the core barrel 6.23 are slidably adapted and inserted, and the rod 6.211 and the core barrel 6.23 are sealed and connected by a first elastic rubber film 6.212, thereby preventing the hydraulic oil in the anti-leakage space 4 from entering the core barrel 6.23. In actual use, when the pressure of the hydraulic oil in the anti-leakage space 4 increases, the rod 6.211 moves toward the bottom of the core barrel 6.23. , that is, the pressure at the insertion end of the rod 6.211 is less than the pressure in the anti-leakage space 4, so that under the squeezing action of the hydraulic oil in the anti-leakage space 4, the rod 6.211 moves toward the bottom of the core tube 6.23, and this movement is the insertion movement of the rod 6.211. The insertion movement of the rod 6.211 provides a driving force for the plug-in locking action between the latch portion 6.22 and the slot structure 6.1. In other words, when the cylinder barrel 1 ruptures and loses pressure, the hydraulic oil inside the cylinder barrel 1 enters the anti-leakage space 4, thereby causing the pressure in the anti-leakage space 4 to increase rapidly, and the rod 6.211 moves, then the plug-in locking occurs between the latch portion 6.22 and the slot structure 6.1.

[0042] In another embodiment provided by the present invention, the latch portion 6.22 includes a plurality of mounting holes 6.221 opened on the side of the core barrel 6.23, the axis of the mounting hole 6.221 is perpendicular to the axis of the core barrel 6.23, and each mounting hole 6.221 is on the same circumferential ring line, and each mounting hole 6.221 is movably inserted with a pin rod 6.222, and the pin rod 6.222 can accept the movement of the rod 6.211 and be engaged with the ring gear structure 6.12;

[0043] The pin rod 6.222 is connected to the mounting hole 6.221 via a second elastic rubber membrane 6.223, thereby further improving the sealing performance of the core tube 6.23, which is beneficial to further prevent the hydraulic oil in the anti-leakage space 4 from entering the isolation tube 5.1;

[0044] The end of the rod 6.211 extending into the core tube 6.23 is provided with a wedge-shaped portion 6.224, which can contact the end of the pin 6.222, and there is a spacing space between the insertion end of the rod 6.211 and the bottom wall of the core tube 6.23;

[0045] In actual use, when the rod 6.211 is inserted, the pin 6.222 is squeezed by the wedge 6.224 on the rod 6.211, so that the pin 6.222 extends toward the slot structure 6.1, thereby locking with the ring tooth groove 6.123 on the ring tooth structure 6.12 to complete the locking.

[0046] In another embodiment provided by the present invention, the mounting hole 6.221 is located in the groove body of the air guide groove 6.24, the number of the air guide grooves 6.24 corresponds to the number of the mounting holes 6.221, and the pin rod 6.222 is engaged with the ring gear structure 6.12, and the air guide groove 6.24 is in a blocked state. Specifically, when the pin rod 6.222 does not extend out of the mounting hole 6.221, the air guide groove 6.24 is in a conducting state. When the pin rod 6.222 extends out of the mounting hole 6.221, the rod body of the pin rod 6.222 blocks the air guide groove 6.24, thereby blocking the normal airflow of the air guide groove 6.24, thereby playing a role of limiting the resistance to the movement of the plug column 5.2 in the isolation tube 5.1, and forming a coordinated cooperation with the locking of the locking pin assembly 6.

[0047] In another embodiment provided by the present invention, a sliding ring 7 movably connected to the outside of the cylinder 1 is provided in the anti-leakage space 4, the sliding ring 7 is fixed to each pin rod 6.222, a sliding sleeve 8 is fixed to the inner ring surface of the sliding ring 7, the sliding sleeve 8 is movably connected to the outside of the cylinder 1, and a plurality of sliding balls 9 are movably installed on the inner wall surface of the sliding sleeve 8. In actual use, when the pin rod 6.222 is inserted and moved, under the connection and transmission action of the sliding ring 7 and the sliding sleeve 8, the pin rods 6.222 at other positions in the anti-leakage space 4 are inserted at the same time, so that each locking pin assembly 6 completes synchronous locking, which is beneficial for the piston rod 2 to maintain a uniform force state when locked.

[0048] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-performance double self-locking hydraulic cylinder, comprising a cylinder barrel (1) of the hydraulic cylinder, a piston rod (2) being mounted on the cylinder barrel (1), characterized in that: The external fixed cover of the cylinder (1) is connected to a protective cylinder (3), and an independent anti-leakage space (4) is formed between the inner wall of the protective cylinder (3) and the outer wall of the cylinder (1). The anti-leakage space (4) is filled with hydraulic oil. A self-locking mechanism capable of locking the piston rod (2) is fixed in the anti-leakage space (4), and the self-locking mechanism comprises: The rail plug assembly (5) comprises a plurality of isolation cylinders (5.1) located in the anti-leakage space (4), the opening of each isolation cylinder (5.1) being connected to the external atmosphere, an insertion column (5.2) being adapted to be inserted in the isolation cylinder (5.1), the protruding ends of the insertion columns (5.2) being fixed to the same connecting block (5.3), and the connecting block (5.3) being fixed to the piston rod (2); A lock pin assembly (6), comprising a slot structure (6.1) arranged on a plug column (5.2), and also comprising a latch unit (6.2) installed in an isolation cylinder (5.1), wherein the latch unit (6.2) comprises a pressure-bearing portion (6.21) located in the anti-leakage space (4), and the latch unit (6.2) also comprises a latch portion (6.22) located in the isolation cylinder (5.1), and when the oil pressure on the pressure-bearing portion (6.21) increases, the latch portion (6.22) is inserted into the slot structure (6.1) to complete the locking; The slot structure (6.1) comprises a plug-in channel (6.11) located at the insertion end of the plug column (5.2), a ring tooth structure (6.12) capable of matching and meshing with the plug pin (6.22) is provided in the plug-in channel (6.11), the plug-in channel (6.11) is a columnar channel space, a plurality of branch holes (6.13) communicating with the external atmosphere are provided on the side surface of the end of the plug-in channel (6.11), the ring tooth structure (6.12) comprises a ring column groove (6.121) provided on the inner wall surface of the plug-in channel (6.11), a sliding sleeve (6.122) is slidably adapted in the ring column groove (6.121) ), each of the branch holes (6.13) is located in the annular column groove (6.121), a plurality of annular tooth grooves (6.123) capable of matching and meshing with the latch portion (6.22) are provided on the inner wall surface of the sliding sleeve (6.122), a notch (6.124) is provided in the middle of the sliding sleeve (6.122), the sliding sleeve (6.122) has a blocking position in the annular column groove (6.121) capable of shielding the branch hole (6.13), and when the notch (6.124) is in contact with and communicates with the branch hole (6.13), the sliding sleeve (6.122) is in an avoidance position in the annular column groove (6.121); The latch unit (6.2) further comprises a core barrel (6.23) located in the plug-in channel (6.11), the core barrel (6.23) being fixedly inserted through the bottom of the isolation barrel (5.1), the barrel mouth end of the core barrel (6.23) being located in the anti-leakage space (4), the pressure-bearing portion (6.21) comprising a rod (6.211) plugged into the core barrel (6.23), the rod (6.211) and the core barrel (6.23) being sealed and connected via a first elastic rubber membrane (6.212), and the rod (6.211) being pressed when the hydraulic oil pressure in the anti-leakage space (4) increases. The pin portion (6.22) moves toward the bottom of the core tube (6.23), the pin portion (6.22) comprises a plurality of mounting holes (6.221) formed on the side of the core tube (6.23), each of the mounting holes (6.221) is on the same circumferential ring line, a pin rod (6.222) is movably inserted in each of the mounting holes (6.221), the pin rod (6.222) and the mounting hole (6.221) are connected via a second elastic rubber membrane (6.223), and the pin rod (6.222) can accept the movement of the rod (6.211) and engage with the ring gear structure (6.12).

2. A high performance double self-locking hydraulic cylinder according to claim 1, characterized in that: One end of the rod (6.211) extending into the core tube (6.23) is provided with a wedge-shaped portion (6.224), and the wedge-shaped portion (6.224) can contact the end of the pin rod (6.222).

3. A high performance double self-locking hydraulic cylinder according to claim 2, characterized in that: There is a spacing space between the insertion end of the rod (6.211) and the bottom wall of the core tube (6.23).

4. A high performance double self-locking hydraulic cylinder according to claim 3, characterized in that: An air guide groove (6.24) is provided on the outer side of the core barrel (6.23), the mounting hole (6.221) is located in the groove body of the air guide groove (6.24), and the air guide groove (6.24) is in a blocked state when the pin rod (6.222) is engaged with the ring gear structure (6.12).

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