A safe self-locking two-stage hydraulic piston rod structure

Abstract

The present invention is used in the field of hydraulic piston rod technology, and discloses a safety self-locking two-stage hydraulic piston rod structure, including a mounting shell, a first connector fixedly mounted on one end of the mounting shell, and a second connector fixedly mounted on the other end of the mounting shell, a sealing piston head is arranged inside the mounting shell, and a piston support rod is fixedly connected to one end of the sealing piston head, and a contact support head is fixedly connected to one end of the piston support rod located outside the mounting shell, and a self-locking mechanism is arranged on the surface of the mounting shell, which prevents the piston from retracting when the oil refluxes by limiting the piston. The safety self-locking two-stage hydraulic piston rod structure, through the self-locking function of the self-locking mechanism, ensures that the piston rod will not accidentally retract or extend when the hydraulic system fails or the pressure is unstable, greatly reducing the risk of injury to operators and equipment.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic piston rods, in particular to a safety self-locking two-stage hydraulic piston rod structure. Background Art

[0002] With the continuous development of industrial technology, hydraulic systems have been widely used in various fields, from machinery manufacturing to engineering construction, from aerospace to automobile industry. Hydraulic systems have become the core power source of many key equipment with their high efficiency and stable performance. Among many hydraulic equipment, the hydraulic piston rod is an important part of the actuator. Its performance and reliability directly affect the working efficiency and safety of the entire system. However, there are some problems that need to be solved in the practical application of the traditional hydraulic piston rod structure.

[0003] At present, the common hydraulic piston rod structure on the market is usually a single-stage structure. In some specific working environments, there are problems such as limited stroke and insufficient load-bearing capacity. In order to meet the needs of larger stroke and higher load-bearing capacity, a two-stage hydraulic piston rod structure came into being. However, the existing two-stage hydraulic piston rod structure also exposes some safety hazards during use. On the one hand, in some occasions with high safety requirements, such as heavy machinery, mining equipment, etc., once the hydraulic system fails or the pressure is unstable, the piston rod may accidentally retract or extend, causing serious harm to the operator and equipment. This unexpected movement will not only disrupt the normal working order of the equipment, but also may cause major safety accidents and bring huge economic losses to the enterprise. On the other hand, the traditional two-stage hydraulic piston rod structure is susceptible to external shock and vibration during operation due to the lack of an effective self-locking mechanism. In some harsh working environments, such as when natural disasters such as earthquakes and strong winds occur, or when strong shock and vibration are encountered during the operation of the equipment, the piston rod may be displaced, thereby affecting the accuracy and stability of the equipment. Summary of the invention

[0004] The purpose of the present invention is to provide a safe self-locking two-stage hydraulic piston rod structure to solve the problem that the hydraulic piston rod proposed in the above background technology is not stable enough to self-lock when the hydraulic system fails or the pressure is unstable or is affected by external shock and vibration.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a safe self-locking two-stage hydraulic piston rod structure, comprising a mounting shell, a first connecting head fixedly mounted on one end of the mounting shell, and a second connecting head fixedly mounted on the other end of the mounting shell, a sealing piston head is arranged inside the mounting shell, and a piston support rod is fixedly connected to one end of the sealing piston head, and a contact support head is fixedly connected to one end of the piston support rod located outside the mounting shell, a dustproof bellows is connected between the contact support head and the outer surface of one end of the mounting shell, and a self-locking mechanism is arranged on the surface of the mounting shell, which prevents the piston from retracting when the oil flows back by limiting the piston.

[0006] Preferably, the self-locking mechanism includes: an installation box, which is fixedly arranged on the outer surface of one end of the installation shell, and a driving motor is fixedly installed inside the installation box, one end of the output shaft of the driving motor is fixedly connected with a rotating wheel, and a sliding cylinder is fixedly arranged on the side surface of one end of the rotating wheel facing the sealing piston head, a rotating sealed bearing is installed inside one end of the installation shell, and the sealing bearing is connected with a locking rod toward one end of the sliding cylinder, and a driving plate is fixedly arranged on the side surface of one end of the sliding cylinder on the locking rod, and a sliding rod is fixedly arranged on the side surface of one end of the sliding cylinder on the driving plate, and an anti-loosening rod is fixedly arranged on the side surface of one end of the sealing bearing facing the sealing piston head.

[0007] By adopting the above technical solution, the sealing piston head and the piston support rod can be stably supported when the oil pressure is unstable.

[0008] Preferably, the sealing piston head is in sliding friction connection with the inner surface of the mounting shell, and the sealing piston head, the piston support rod and the contact support head are concentrically arranged, and the piston support rod is in sliding friction connection with one end of the mounting shell.

[0009] By adopting the above technical solution, the piston support rod can slide stably under the support of the hydraulic oil.

[0010] Preferably, the sealed bearing is mechanically sealedly connected to the mounting housing, and the sealed bearing is snap-fittedly mounted to the locking rod, and the locking rod is of polygonal design, the rotating wheel, sliding cylinder, sliding rod, driving plate, locking rod and sealed bearing are concentrically arranged, and the sliding rod is slidingly connected to the sliding cylinder, the anti-loosening rod is rotatably connected to the mounting housing, and the anti-loosening rod is threadedly connected to the sealing piston head and the piston support rod.

[0011] By adopting the above technical solution, the anti-loosening rod can maintain a stable connection with the sealing piston head and the piston support rod through rotation without blocking the sliding of the sealing piston head and the piston support rod.

[0012] Preferably, an electric push rod is fixedly provided on the inner surface of the mounting shell, and one end of the electric push rod is fixedly connected to a driving block, and a rotating support wheel is installed on the lower end of the driving block, and the driving block is a C-shaped design with the opening facing downward, and the outer surface of the support wheel is in contact with the two outer surfaces of the driving plate.

[0013] By adopting the above technical solution, the driving block can drive the driving plate to slide laterally through the supporting wheel and maintain a stable connection with the driving plate.

[0014] Preferably, an anti-drop rod is fixedly provided on the outer surface of the contact support head, and anti-drop grooves are evenly provided on the side surface of the anti-drop rod facing the mounting shell, a fixed block is fixedly provided on the outer surface of the mounting shell, and a sliding anti-drop block is installed on the side surface of the fixed block, the fixed block is provided at one end of the mounting shell provided with a second connecting head, the anti-drop block is installed by clamping with the anti-drop rod through the anti-drop groove, and the anti-drop block and the fixed block are connected by sliding friction.

[0015] By adopting the above technical solution, the contact support head can be limited and cannot move under the drive of oil pressure.

[0016] Preferably, a lubrication and cleaning mechanism is provided on the surface of the mounting housing, and lubrication and cleaning of the piston support rod is achieved by spraying fluid on the surface of the piston support rod extending out of the mounting housing.

[0017] By adopting the above technical solution, the piston support rod can be lubricated or cleaned as needed.

[0018] Preferably, the lubrication and cleaning mechanism includes: an extrusion block, which is fixedly arranged on the outer surface of the rotating wheel, and a fluid storage box is fixedly arranged on the inner bottom surface of the installation box below the rotating wheel, a sliding piston plate is arranged inside the installation box, and an extrusion rod is fixedly arranged on the upper surface of the piston plate, a first one-way valve is fixedly arranged on the lower surface of the installation box, and the upper end of the first one-way valve passes through the inner bottom surface of the fluid storage box, a liquid separator ring is fixedly arranged on the side surface of one end of the installation shell provided with a second connecting head, and a pressure chamber is opened inside the liquid separator ring, and a connecting pipe is connected between the pressure chamber and the fluid storage tank, and a second one-way valve is evenly fixedly arranged on the inner surface of the liquid separator ring.

[0019] By adopting the above technical solution, the fluid can be transmitted through the connecting pipe.

[0020] Preferably, the extrusion block is semicircular in design, and is located directly above the extrusion rod, and the upper end of the extrusion rod passes through the upper surface of the fluid storage box, the fluid storage box and the piston plate are connected by sliding friction, and a spring is connected between the fluid storage box and the piston plate.

[0021] By adopting the above technical solution, the piston plate can be driven to slide back and forth to achieve the suction and discharge of fluid.

[0022] Preferably, one end of the first one-way valve is connected to the fluid storage tank, and one end of the second one-way valve is connected to the pressure chamber.

[0023] By adopting the above technical solution, the second one-way valve can spray out the fluid in the pressure chamber.

[0024] Compared with the prior art, the beneficial effects of the present invention are: the safe self-locking two-stage hydraulic piston rod structure:

[0025] 1. Through the self-locking function of the self-locking mechanism, when the hydraulic system fails or the pressure is unstable, it ensures that the piston rod will not accidentally retract or extend, greatly reducing the risk of injury to operators and equipment, and providing reliable safety protection for high-risk working environments such as heavy machinery and mining equipment;

[0026] Furthermore, the self-locking method after being extended and retracted into place is adopted, so that the hydraulic piston rod can have good impact and vibration resistance, so that the equipment can maintain stable operation under harsh working conditions such as natural disasters such as earthquakes, strong winds, and strong mechanical shocks, ensuring the continuity and reliability of production;

[0027] 2. By arranging manually adjustable anti-drop rods on both sides of the mounting housing, when a person enters under the weight supported by the hydraulic piston rod, the hydraulic piston rod can be manually locked to prevent other staff from controlling the hydraulic piston rod to release the support for the weight without knowing it, thus avoiding accidental crushing injuries;

[0028] 3. By arranging a liquid separator ring at one end of the mounting housing to lubricate and clean the sliding portion of the piston support rod, the piston support rod will not be excessively worn with the mounting housing due to dust during the sliding process, thereby reducing abnormal wear of the hydraulic piston rod after the dustproof bellows is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the installation housing, the contact support head and the dustproof bellows connected in the present invention;

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the overall working state of the present invention;

[0032] Figure 4 It is a three-dimensional structural schematic diagram of the cross-section surface of the connection between the fixing block and the anti-slip block of the present invention;

[0033] Figure 5 It is a schematic diagram of the three-dimensional structure of the overall cutaway surface of the present invention;

[0034] Figure 6 It is a three-dimensional structural schematic diagram of the cross-section surface of the connection between the anti-slip rod and the anti-slip block of the present invention;

[0035] Figure 7 It is a three-dimensional structural schematic diagram of the cross-section surface of the connecting pipe and the pressure chamber of the present invention;

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the cross-section surface of the installation housing and the sealed bearing connection of the present invention;

[0037] Fig. 9 This is a schematic diagram of the three-dimensional structure of the connection between the drive plate, the drive block and the support wheel of the present invention;

[0038] Fig.10 It is a schematic diagram of the three-dimensional structure of the sliding rod, the driving plate and the locking rod connected to each other in the present invention.

[0039] In the figure: 1. mounting shell; 2. first connector; 3. second connector; 4. sealing piston head; 5. piston support rod; 6. contact support head; 7. dustproof bellows; 8. mounting box; 9. driving motor; 10. rotating wheel; 11. sliding cylinder; 12. sliding rod; 13. driving plate; 14. engaging rod; 15. sealing bearing; 16. anti-loosening rod; 17. electric push rod; 18. driving block; 19. supporting wheel; 20. anti-slip rod; 21. anti-slip groove; 22. fixing block; 23. anti-slip block; 24. extrusion block; 25. fluid storage box; 26. piston plate; 27. extrusion rod; 28. first one-way valve; 29. ​​liquid separator ring; 30. connecting pipe; 31. pressure chamber; 32. second one-way valve. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 10 The present invention provides a technical solution: a safe self-locking two-stage hydraulic piston rod structure.

[0042] Embodiment 1: This embodiment discloses a mounting shell 1, a first connector 2 is fixedly mounted on one end of the mounting shell 1, and a second connector 3 is fixedly mounted on the other end of the mounting shell 1, a sealing piston head 4 is arranged inside the mounting shell 1, and a piston support rod 5 is fixedly connected to one end of the sealing piston head 4, and a contact support head 6 is fixedly connected to one end of the piston support rod 5 located outside the mounting shell 1, a dustproof bellows 7 is connected between the contact support head 6 and the outer surface of one end of the mounting shell 1, and a self-locking mechanism is arranged on the surface of the mounting shell 1, which prevents the piston from retracting when the oil flows back by limiting the position of the piston;

[0043] The self-locking mechanism comprises: an installation box 8, the installation box 8 is fixedly arranged on the outer surface of one end of the installation shell 1, and a driving motor 9 is fixedly installed inside the installation box 8, a rotating wheel 10 is fixedly connected to one end of the output shaft of the driving motor 9, and a sliding cylinder 11 is fixedly arranged on the side surface of one end of the rotating wheel 10 facing the sealing piston head 4, a rotating sealing bearing 15 is installed inside one end of the installation shell 1, and a clamping rod 14 is connected to one end of the sealing bearing 15 facing the sliding cylinder 11, and a driving plate 13 is fixedly arranged on the side surface of the clamping rod 14 facing one end of the sliding cylinder 11, and a sliding rod 12 is fixedly arranged on the side surface of one end of the driving plate 13 facing the sliding cylinder 11, and an anti-loosening rod 16 is fixedly arranged on the side surface of one end of the sealing bearing 15 facing the sealing piston head 4;

[0044] The sealing piston head 4 is in sliding friction connection with the inner surface of the mounting housing 1, and the sealing piston head 4, the piston support rod 5 and the contact support head 6 are concentrically arranged, and the piston support rod 5 is in sliding friction connection with one end of the mounting housing 1;

[0045] The sealed bearing 15 is mechanically sealed to the mounting housing 1, and the sealed bearing 15 is mounted in a snap-fit ​​manner with the engaging rod 14, and the engaging rod 14 is of polygonal design, the rotating wheel 10, the sliding cylinder 11, the sliding rod 12, the driving plate 13, the engaging rod 14 and the sealed bearing 15 are concentrically arranged, and the sliding rod 12 is slidingly connected to the sliding cylinder 11, the anti-loosening rod 16 is rotationally connected to the mounting housing 1, and the anti-loosening rod 16 is threadedly connected to the sealing piston head 4 and the piston support rod 5;

[0046] An electric push rod 17 is fixedly arranged on the inner surface of the mounting housing 1, and a driving block 18 is fixedly connected to one end of the electric push rod 17, and a rotating support wheel 19 is installed at the lower end of the driving block 18. The driving block 18 is a C-shaped design with an opening facing downward, and the outer surface of the support wheel 19 is in contact with the two outer surfaces of the driving plate 13;

[0047] During operation, the sealing piston head 4 is pushed back and forth by injecting hydraulic oil into the two ends of the mounting shell 1 through the first connector 2 and the second connector 3 at the two ends of the mounting shell 1, so as to achieve the purpose of supporting and pulling the target object by driving the piston support rod 5 and the contact support head 6 through the sealing piston head 4. At this time, when the piston support rod 5 slides inside the mounting shell 1, the driving motor 9 inside the mounting box 8 is started to drive the sealing bearing 15 and the anti-loosening rod 16 to rotate through the rotating wheel 10, the sliding cylinder 11, the sliding rod 12, the driving plate 13 and the locking rod 14. At this time, the anti-loosening rod 16 is always in contact with the locking rod 16 through the thread. The sealing piston head 4 and the piston support rod 5 remain connected. When the pressure in the pipeline connected by the first connector 2 and the second connector 3 is unstable, even if the unstable pressure causes the sealing piston head 4 to have a tendency to retract under the gravity of the supported object, the sealing piston head 4 will remain stable under the support of the thread on the surface of the anti-loosening rod 16. During the normal reciprocating sliding of the sealing piston head 4, the piston support rod 5 and the contact support head 6, the dustproof bellows 7 is unfolded and folded as the contact support head 6 extends and retracts to achieve the purpose of protecting the piston support rod 5 extending out of the mounting housing 1 from dust and corrosive gases in the external environment.

[0048] When the contact support head 6 moves into place, the electric push rod 17 is started to drive the drive block 18 to drive the drive plate 13 to move through the support wheel 19. At this time, the drive plate 13 drives the engaging rod 14 to disengage from the sealing bearing 15, thereby avoiding the drive motor 9 from being accidentally started during the support process of the contact support head 6, resulting in support failure.

[0049] Embodiment 2: Based on Embodiment 1, this embodiment discloses that an anti-slip rod 20 is fixedly provided on the outer surface of the contact support head 6, and an anti-slip groove 21 is evenly provided on the side surface of the anti-slip rod 20 facing the mounting shell 1, a fixed block 22 is fixedly provided on the outer surface of the mounting shell 1, and a sliding anti-slip block 23 is installed on the side surface of the fixed block 22, the fixed block 22 is arranged at one end of the mounting shell 1 provided with the second connector 3, the anti-slip block 23 is installed by engaging with the anti-slip rod 20 through the anti-slip groove 21, and the anti-slip block 23 and the fixed block 22 are connected by sliding friction;

[0050] When the staff enters under the object supported by the hydraulic piston rod, the staff can limit the anti-dropout rod 20 by engaging the anti-dropout block 23 on the surface of the sliding fixed block 22 with the anti-dropout groove 21 on the surface of the anti-dropout rod 20. Therefore, even if other staff members operate to retract the contact support head 6, the contact support head 6 will be limited by the fixed block 22 through the engagement of the anti-dropout block 23 with the anti-dropout groove 21, thereby ensuring the safety of the staff entering under the supported object.

[0051] Embodiment 3: Based on Embodiment 1 and Embodiment 2, this embodiment discloses that a lubrication and cleaning mechanism is provided on the surface of the mounting housing 1, and lubrication and cleaning of the piston support rod 5 are achieved by spraying fluid on the surface of the piston support rod 5 extending out of the mounting housing 1;

[0052] The lubrication and cleaning mechanism comprises: an extrusion block 24, which is fixedly arranged on the outer surface of the rotating wheel 10, and a fluid storage box 25 is fixedly arranged on the inner bottom surface of the installation box 8 below the rotating wheel 10, a sliding piston plate 26 is arranged inside the installation box 8, and an extrusion rod 27 is fixedly arranged on the upper surface of the piston plate 26, a first one-way valve 28 is fixedly arranged on the lower surface of the installation box 8, and the upper end of the first one-way valve 28 passes through the inner bottom surface of the fluid storage box 25, a liquid separator ring 29 is fixedly arranged on the side surface of one end of the installation shell 1 provided with the second connector 3, and a pressure chamber 31 is opened inside the liquid separator ring 29, and a connecting pipe 30 is connected between the pressure chamber 31 and the fluid storage box 25, and a second one-way valve 32 is evenly fixedly arranged on the inner surface of the liquid separator ring 29;

[0053] The extrusion block 24 is semicircular in design and is located directly above the extrusion rod 27. The upper end of the extrusion rod 27 penetrates the upper surface of the fluid storage box 25. The fluid storage box 25 and the piston plate 26 are connected by sliding friction, and a spring is connected between the fluid storage box 25 and the piston plate 26.

[0054] One end of the first one-way valve 28 is connected to the fluid storage tank 25, and one end of the second one-way valve 32 is connected to the pressure chamber 31;

[0055] During the start-up process of the drive motor 9, the rotating wheel 10 rotates through the extrusion block 24 to periodically push the extrusion rod 27, so that the extrusion rod 27 drives the piston plate 26 to slide down inside the fluid storage box 25 to compress the spring between the fluid storage box 25, thereby pressing the gas in the fluid storage box 25 out of the connecting pipe 30. The connecting pipe 30 injects the gas into the pressure chamber 31 of the liquid separator ring 29 and sprays it through the second one-way valve 32 to jet clean the sliding surface of the piston support rod 5. When lubrication is needed, the air pipe connected to the first one-way valve 28 is replaced with a lubricating oil injection pipe. When the extrusion rod 27 is not under pressure, the spring between the piston plate 26 and the fluid storage box 25 drives the piston plate 26 to slide up, so as to suck the lubricating oil into the fluid storage box 25 and then spray the lubricating oil onto the surface of the piston support rod 5, so as to achieve the effect of lubricating the piston support rod 5.

[0056] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A safe self-locking two-stage hydraulic piston rod structure, comprising a mounting housing (1), one end of the mounting housing (1) being fixedly mounted with a first connector (2), and the other end of the mounting housing (1) being fixedly mounted with a second connector (3), a sealing piston head (4) being arranged inside the mounting housing (1), one end of the sealing piston head (4) being fixedly connected with a piston support rod (5), and one end of the piston support rod (5) being located outside the mounting housing (1) being fixedly connected with a contact support head (6), characterized in that: A dustproof bellows (7) is connected between the contact support head (6) and the outer surface of one end of the mounting shell (1); a self-locking mechanism is provided on the surface of the mounting shell (1) to prevent the piston from retracting when the oil flows back through limiting the position of the piston; The self-locking mechanism comprises: a mounting box (8), the mounting box (8) being fixedly arranged on the outer surface of one end of the mounting shell (1), and a driving motor (9) being fixedly arranged inside the mounting box (8), one end of the output shaft of the driving motor (9) being fixedly connected to a rotating wheel (10), and a sliding cylinder (11) being fixedly arranged on the side surface of one end of the rotating wheel (10) facing the sealing piston head (4), a rotatable sealing bearing (15) being installed inside one end of the mounting shell (1), and a locking rod (14) being connected to the end of the sealing bearing (15) facing the sliding cylinder (11), and a driving plate (13) being fixedly arranged on the side surface of one end of the locking rod (14) facing the sliding cylinder (11), and a sliding rod (12) being fixedly arranged on the side surface of one end of the driving plate (13) facing the sliding cylinder (11), and an anti-loosening rod (16) being fixedly arranged on the side surface of one end of the sealing bearing (15) facing the sealing piston head (4).

2. A safe self-locking two-stage hydraulic piston rod structure according to claim 1, characterized in that: The sealing piston head (4) is in sliding friction connection with the inner surface of the mounting housing (1), and the sealing piston head (4), the piston support rod (5) and the contact support head (6) are arranged concentrically, and the piston support rod (5) is in sliding friction connection with one end of the mounting housing (1).

3. A safe self-locking two-stage hydraulic piston rod structure according to claim 1, characterized in that: The sealed bearing (15) is mechanically sealedly connected to the mounting housing (1), and the sealed bearing (15) is mounted in a snap-fit ​​manner with the snap-fitting rod (14), and the snap-fitting rod (14) is of polygonal design; the rotating wheel (10), the sliding cylinder (11), the sliding rod (12), the driving plate (13), the snap-fitting rod (14) and the sealed bearing (15) are concentrically arranged, and the sliding rod (12) is slidably connected to the sliding cylinder (11); the anti-loosening rod (16) is rotationally connected to the mounting housing (1), and the anti-loosening rod (16) is threadedly connected to the sealed piston head (4) and the piston support rod (5).

4. A safe self-locking two-stage hydraulic piston rod structure according to claim 1, characterized in that: An electric push rod (17) is fixedly arranged on the inner surface of the mounting housing (1), one end of the electric push rod (17) is fixedly connected to a driving block (18), and a rotating support wheel (19) is mounted on the lower end of the driving block (18), the driving block (18) is of a C-shaped design with an opening facing downward, and the outer surface of the support wheel (19) is in contact with two outer side surfaces of the driving plate (13).

5. The safe self-locking two-stage hydraulic piston rod structure according to claim 1 is characterized in that: An anti-slip rod (20) is fixedly provided on the outer surface of the contact support head (6), and an anti-slip groove (21) is evenly provided on the side surface of the anti-slip rod (20) facing the mounting shell (1). A fixed block (22) is fixedly provided on the outer surface of the mounting shell (1), and a sliding anti-slip block (23) is installed on the side surface of the fixed block (22). The fixed block (22) is arranged at one end of the mounting shell (1) provided with a second connector (3). The anti-slip block (23) is mounted by engaging with the anti-slip rod (20) through the anti-slip groove (21), and the anti-slip block (23) and the fixed block (22) are connected by sliding friction.

6. A safe self-locking two-stage hydraulic piston rod structure according to claim 1, characterized in that: The surface of the mounting housing (1) is provided with a lubrication and cleaning mechanism, and lubrication and cleaning of the piston support rod (5) are achieved by spraying fluid onto the surface of the piston support rod (5) extending out of the mounting housing (1).

7. A safe self-locking two-stage hydraulic piston rod structure according to claim 6, characterized in that: The lubrication and cleaning mechanism comprises: an extrusion block (24), the extrusion block (24) being fixedly arranged on the outer surface of the rotating wheel (10), and a fluid storage box (25) being fixedly arranged on the inner bottom surface of the installation box (8) below the rotating wheel (10), a sliding piston plate (26) being arranged inside the installation box (8), and an extrusion rod (27) being fixedly arranged on the upper surface of the piston plate (26), a first one-way valve (28) being fixedly arranged on the lower surface of the installation box (8), and the upper end of the first one-way valve (28) passing through the inner bottom surface of the fluid storage box (25), a liquid separator ring (29) being fixedly arranged on the side surface of one end of the second connector (3) provided on the installation housing (1), and a pressure chamber (31) being opened inside the liquid separator ring (29), and a connecting pipe (30) being connected between the pressure chamber (31) and the fluid storage box (25), and a second one-way valve (32) being evenly fixedly arranged on the inner surface of the liquid separator ring (29).

8. A safe self-locking two-stage hydraulic piston rod structure according to claim 7, characterized in that: The extrusion block (24) is semicircular in design and is located directly above the extrusion rod (27). The upper end of the extrusion rod (27) penetrates the upper surface of the fluid storage box (25). The fluid storage box (25) and the piston plate (26) are connected by sliding friction, and a spring is connected between the fluid storage box (25) and the piston plate (26).

9. A safe self-locking two-stage hydraulic piston rod structure according to claim 7, characterized in that: One end of the first one-way valve (28) is connected to the fluid storage tank (25), and one end of the second one-way valve (32) is connected to the pressure chamber (31).

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