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CN-121976989-A - Mechanical locking hydraulic cylinder

CN121976989ACN 121976989 ACN121976989 ACN 121976989ACN-121976989-A

Abstract

The application discloses a mechanical locking hydraulic cylinder, which relates to the technical field of hydraulic devices and comprises a cylinder body assembly and a locking assembly I, wherein the cylinder body assembly comprises a cylinder body, a piston rod, a communicating pipe, a sliding cylinder, a stop block and a spring II, the sliding cylinder is sleeved on the piston rod, the piston rod and the sliding cylinder are arranged in a sliding mode in the cylinder body, the locking assembly I comprises a fixed ring and a limiting piece, the limiting piece comprises a first telescopic rod, a first spring and a clamping block, the stop block and the fixed ring are fixed on the piston rod, two ends of the first telescopic rod are respectively arranged on the fixed ring and the first telescopic rod, the stop block is arranged between the two stop blocks, the sliding cylinder is located between the two stop blocks, the sliding cylinder can completely avoid sliding of the piston rod caused by leakage in a hydraulic system through a mechanical locking mechanism, the reliability and the safety of equipment are improved, the friction force is generated by completely attaching the clamping block and the stop block under a stop state, the piston rod is effectively prevented from accidentally extending outwards, and the electromagnetic valve and the spring II enable the sliding cylinder to be automatically reset during stop.

Inventors

  • HUANG WENPING
  • XUAN HUAN
  • GUO DIFENG
  • Qiang Ruicheng

Assignees

  • 无锡市瑞可特科技有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (10)

  1. 1. The mechanical locking hydraulic cylinder is characterized by comprising a cylinder body assembly (100) and a locking assembly I (200); The cylinder body assembly (100) comprises a cylinder body (110), a piston rod (120), a communicating pipe (130), a sliding cylinder (150), a stop block (170) and a second spring (180); A sliding cylinder (150) is sleeved on the piston rod (120), and the piston rod (120) and the sliding cylinder (150) are arranged in a sliding manner in the cylinder body (110); The first locking component (200) comprises a fixed ring (210) and a limiting piece (220), wherein the limiting piece (220) comprises a first telescopic rod (221), a first spring (222) and a clamping block (223); A stop block (170) and a fixed ring (210) are fixed on the piston rod (120), and two ends of a first telescopic rod (221) are respectively arranged on the fixed ring (210) and the first telescopic rod (221); the number of the two stop blocks (170) is two, and the sliding cylinder (150) is positioned between the two stop blocks (170); Two ends of a first spring (222) are arranged on the fixed ring (210) and the clamping block (223), and two ends of a second spring (180) are fixed on the stop block (170) and the sliding cylinder (150); Both ends of the communicating pipe (130) are fixed on the cylinder body (110), and both ends of the communicating pipe (130) are respectively positioned at both sides of the sliding cylinder (150).
  2. 2. A mechanically locked hydraulic cylinder as claimed in claim 1, wherein the cylinder assembly (100) further comprises a solenoid valve (140), the solenoid valve (140) being fixed to the communication pipe (130); the electromagnetic valve (140) is used for controlling the communication and closing of cavities at two sides of the sliding cylinder (150) in the cylinder body (110); When the device is shut down integrally, the electromagnetic valve (140) is opened, the second spring (180) enables the sliding cylinder (150) to reset, the sliding cylinder (150) does not collide with the clamping block (223), and the first spring (222) pushes the clamping block (223) to enter between the stop block (170) and the cylinder body (110).
  3. 3. A mechanically locked hydraulic cylinder as claimed in claim 2, wherein the cylinder body (110) is a cylinder having a hollow interior, the piston rod (120) is a cylinder, and the axis of the piston rod (120) is on the same line as the axis of the cylinder body (110); the sliding cylinder (150) and the fixed ring (210) are cylindrical and communicated along the axis of the sliding cylinder, the inner ring of the sliding cylinder (150) is tightly attached to the piston rod (120), and the outer ring of the sliding cylinder (150) is tightly attached to the inner wall of the cylinder body (110); The inner ring of the fixed ring (210) is fixed on the outer ring of the piston rod (120), and the axes of the sliding cylinder (150) and the fixed ring (210) are on the same straight line with the axis of the cylinder body (110); the stop block (170) is in a truncated cone shape penetrating along the axis of the stop block, the cross section of the stop block (170) is triangular, the stop block (170) is positioned between the fixed ring (210) and the sliding cylinder (150), and one end of the stop block (170) with the largest outer diameter is close to the sliding cylinder (150); The section of the clamping block (223) is triangular; One side of the clamping block (223) close to the stop block (170) is an arc attached to the stop block, and one side of the clamping block (223) close to the inner wall of the cylinder body (110) is located in an arc attached to the clamping block.
  4. 4. A mechanically locked hydraulic cylinder as claimed in claim 3, characterised in that the side of the block (223) adjacent the stop (170) is fully engaged in the overall rest condition of the device.
  5. 5. A mechanical locking hydraulic cylinder as claimed in claim 1, wherein the first spring (222) is sleeved on the first telescopic rod (221); the first telescopic rod (221) is rotationally connected to one side of the fixed ring (210), and the clamping block (223) is arranged at one end, far away from the fixed ring (210), of the first telescopic rod (221); A torsion spring is sleeved on a rotating shaft which is rotationally connected with the first telescopic rod (221) and the fixed ring (210), and two ends of the torsion spring are respectively fixed on the first telescopic rod (221) and the fixed ring (210); When the sliding cylinder (150) abuts against the clamping block (223), the first telescopic rod (221) is retracted, and the first telescopic rod (221) and the fixed ring (210) are rotationally connected with a torsion spring sleeved on the rotating shaft to drive the clamping block (223) to rotate towards one side of the axis of the cylinder body (110).
  6. 6. A mechanically locked hydraulic cylinder as claimed in claim 1, wherein a plurality of the stoppers (220) are provided, the plurality of stoppers (220) being arranged in a ring shape; the second springs (180) are multiple, and the second springs (180) are annularly arranged.
  7. 7. A mechanically locked hydraulic cylinder as claimed in claim 1, characterized in that the cylinder assembly (100) further comprises a communication port (113), two communication ports (113) being symmetrically provided under the cylinder (110); The two communication ports (113) are respectively positioned at two sides of the sliding cylinder (150); both ends of the communication pipe (130) are respectively fixed in the communication ports (113).
  8. 8. A mechanically locked hydraulic ram as claimed in claim 1, wherein the cylinder assembly (100) further comprises a first inlet (111), a sliding port (112), a second inlet (114), a first seal ring (151), a second seal ring (152) and a third seal ring (160); the cylinder body (110) is provided with a first liquid inlet (111) and a second liquid inlet (114), and the first liquid inlet (111) and the second liquid inlet (114) are respectively positioned at two sides of the sliding cylinder (150); One end of the cylinder body (110) in the axial direction is provided with a sliding opening (112), and a piston rod (120) is arranged in the sliding opening (112) in a sliding sealing manner; the sliding opening (112) and the first locking component (200) are positioned on the same side of the sliding cylinder (150); the first sealing ring (151) is fixed on the outer ring of the sliding cylinder (150), and the first sealing ring (151) is tightly attached to the inner wall of the cylinder body (110); the second sealing ring (152) is fixed on the inner ring of the sliding cylinder (150), and the second sealing ring (152) is tightly attached to the piston rod (120); the third sealing ring (160) is fixed on the inner ring of the sliding opening (112), and the third sealing ring (160) is tightly attached to the piston rod (120).
  9. 9. A mechanically locked hydraulic ram as claimed in claim 1, further comprising a second locking assembly (300); the structure of the locking component II (300) is consistent with that of the locking component I (200); The second locking component (300) is positioned at one side of the sliding cylinder (150) far away from the first locking component (200), and the second locking component (300) and the first locking component (200) are symmetrically arranged; The second locking component (300) and the first locking component (200) respectively correspond to the two stop blocks (170).
  10. 10. A mechanical locking hydraulic cylinder as claimed in claim 1, wherein the first locking assembly (200) further comprises a fitting member (230), the fitting member (230) comprising a mounting plate (231), a mounting ring (232) and a second telescopic rod (233); the attaching piece (230) is arranged between the telescopic rod I (221) and the clamping block (223); The number of the attaching pieces (230) is consistent with that of the limiting pieces (220), and the attaching pieces are in one-to-one correspondence; the mounting plate (231) is arc-shaped, the mounting plate (231) is fixed at one end of the first telescopic rod (221) far away from the fixed ring (210), and one end of the first spring (222) far away from the fixed ring (210) is fixed on the mounting plate (231); one end of a second telescopic rod (233) is fixed on one side of the mounting plate (231) far away from the first telescopic rod (221), and one end of the second telescopic rod (233) far away from the telescopic mounting plate (231) is fixed on the clamping block (223); The mounting ring (232) is annular, the mounting ring (232) is made of rubber, and two ends of the mounting ring (232) are respectively fixed on the mounting plate (231) and the clamping block (223); the mounting plate (231), the clamping block (223) and the mounting ring (232) form a deformation cavity which is not communicated with the outside, the telescopic rod II (233) is positioned in the deformation cavity formed by the mounting plate (231), the clamping block (223) and the mounting ring (232), and hydraulic oil is filled in the deformation cavity formed by the mounting plate (231), the clamping block (223) and the mounting ring (232).

Description

Mechanical locking hydraulic cylinder Technical Field The invention relates to the technical field of hydraulic devices, in particular to a mechanical locking hydraulic cylinder. Background The hydraulic cylinder is used as a core executive component for converting hydraulic energy into mechanical linear motion, and is widely applied to various industrial equipment and engineering machinery which need heavy load push-pull, accurate positioning or long-time locking, such as a platform leveling device, a machine tool guide rail locking device, a rolling mill pressing mechanism, a radar antenna pitching positioning device and the like. In these application scenarios, the piston rod of the hydraulic cylinder often needs to be reliably locked at a specific position in the telescopic stroke to prevent accidental displacement under the action of external force, thereby ensuring the operation precision, stability and safety of the equipment. At present, the main technical scheme for realizing the locking function of the hydraulic cylinder in the industry adopts a hydraulic locking loop, namely, a hydraulic control unidirectional element and the like are integrated in an oil way of a hydraulic system. When the locking is needed, the oil is sealed inside the oil cylinder by cutting off the oil paths of the two cavities of the oil cylinder and utilizing the tightness of the one-way valve, so that the fixing of the piston rod is realized theoretically. However, this purely hydraulic locking has an inherent technical disadvantage that is difficult to overcome thoroughly, namely leakage inside the hydraulic system. Leakage may occur at the piston seal of the cylinder itself, at the mating of the cylinder barrel and the piston rod, or from various components in the hydraulic circuit, such as the connecting lines, the control valve spools, etc. Even a tiny internal leakage can cause the piston rod to generate sliding or creeping due to the slow flow of oil under the long-time locking working condition. The drift of the piston rod position caused by the internal leakage can directly cause processing errors or pointing errors to seriously affect the performance of equipment for equipment requiring high-precision positioning, such as a precision machine tool and a radar, and can cause stability reduction and even safety accidents for safety-related equipment, such as a heavy-load support and a safety braking device. In addition, to maintain the locked state, the system may need to continuously provide pressure to compensate for the leakage, increasing energy consumption. Disclosure of Invention According to the embodiment of the application, by providing the mechanical locking hydraulic cylinder, the problems that in the prior art, leakage of oil of internal elements of a hydraulic system cannot be avoided, hydraulic leakage can be generated after long-time use, so that a sliding phenomenon occurs on a piston rod, and further the efficiency and safety of equipment for installing the hydraulic system are affected are solved, the sliding of the piston rod caused by the internal leakage of the hydraulic system is completely avoided through a mechanical locking mechanism, and the reliability and safety of the equipment are improved; under the stop state, the clamping block is completely attached to the stop block to generate friction force, so that the piston rod can be effectively prevented from accidentally extending outwards, the sliding cylinder is automatically reset when the stop is performed by the electromagnetic valve and the second spring, manual intervention is not needed, the clamping block can rapidly enter the locking position, and the operation convenience is improved. The embodiment of the application provides a mechanical locking hydraulic cylinder, which comprises a cylinder body assembly and a locking assembly I; the cylinder body assembly comprises a cylinder body, a piston rod, a communicating pipe, a sliding cylinder, a stop block and a second spring; the piston rod is sleeved with a sliding cylinder, and the piston rod and the sliding cylinder are arranged in the cylinder body in a sliding manner; The first locking component comprises a fixed ring and a limiting piece, and the limiting piece comprises a first telescopic rod, a first spring and a clamping block; The piston rod is fixed with a stop block and a fixed ring, and one end and the other end of the telescopic rod are respectively arranged on the fixed ring and the telescopic rod; The sliding cylinder is positioned between the two stop blocks; two ends of the first spring are arranged on the fixed ring and the clamping block, and two ends of the second spring are fixed on the stop block and the sliding cylinder; Two ends of the communicating pipe are fixed on the cylinder body, and two ends of the communicating pipe are respectively positioned at two sides of the sliding cylinder. As an improvement, the cylinder body assembly further comprises an ele