CN-224214479-U - Oil cylinder with piston rod protection structure

CN224214479UCN 224214479 UCN224214479 UCN 224214479UCN-224214479-U

Abstract

The application relates to the technical field of shield tunneling machine equipment, in particular to an oil cylinder with a piston rod protection structure, which comprises a cylinder barrel, a piston rod and a protection cover, wherein the piston rod is inserted into the cylinder barrel and slides along the axial direction of the cylinder barrel; the protection cover is arranged outside the cylinder barrel, is connected with the piston rod, can move along with the piston rod and is in sliding fit with the cylinder barrel along the axial direction of the cylinder barrel. A water cavity is formed between the protective cover and the outer side wall of the cylinder barrel and between the protective cover and the piston rod, a flushing port for injecting water into the water cavity is formed in the protective cover, and the water pressure P 1 in the water cavity is greater than the muddy water pressure P 0 in the external environment. According to the application, the protective cover capable of moving along with the piston rod is arranged, the water cavity is arranged between the protective cover and the cylinder barrel, and external sediment is prevented from entering the water cavity by the water pressure higher than the external environment in the water cavity, so that the protective cover can always protect the piston rod and the cylinder in the working process of the piston rod.

Inventors

HU GUOXIANG
MAO SONG
LI WENXIA
SUN XIAO
YE JING
XU JIAN
ZHANG LIANG

Assignees

江苏恒立液压股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250527

Claims (9)

1. An oil cylinder with a piston rod protection structure is characterized by comprising, A cylinder (1), and The piston rod (2) is inserted into the cylinder barrel (1) and slides along the axial direction of the cylinder barrel (1); The piston (3) is arranged at one end of the piston rod (2); The protection cover (5), protection cover (5) cover is established in the cylinder (1) outside, protection cover (5) one end with cylinder (1) is fixed, and the other end is restrained with piston rod (2) sliding pair, protection cover (5) can be along with piston rod (2) move together, the fixed one end of protection cover (5) and piston rod (2) along the axial of cylinder (1) with cylinder (1) sliding fit, be formed with water cavity (6) between protection cover (5) and cylinder (1) lateral wall, piston rod (2).
2. Cylinder with piston rod protection structure according to claim 1, characterized in that the protective cover (5) is provided with a flushing port (51) for filling the water chamber (6).
3. The cylinder with the piston rod protection structure according to claim 2, characterized in that the water pressure P 1 in the water chamber (6) is greater than the muddy water pressure P 0 in the external environment.
4. The oil cylinder with the piston rod protection structure according to claim 1, wherein a limiting step is arranged on the piston rod (2), a first limiting surface (25) arranged towards the bottom of the cylinder barrel (1) is arranged on the limiting step, a second limiting surface is arranged on the protective cover (5), and the first limiting surface (25) is opposite to the second limiting surface.
5. The oil cylinder with the piston rod protection structure according to claim 2, characterized in that a guiding sleeve (4) is arranged at one end of the cylinder opening of the cylinder barrel (1), and the guiding sleeve (4) is positioned between the piston rod (2) and the cylinder barrel (1).
6. The oil cylinder with the piston rod protection structure according to claim 5, wherein an avoidance surface (41) is arranged on the end surface, away from the bottom of the cylinder barrel (1), of the guide sleeve (4), one end, close to the outer side wall of the cylinder barrel (1), of the avoidance surface (41) is obliquely arranged towards the bottom of the cylinder barrel (1), and the water flushing port (51) is opposite to the avoidance surface (41).
7. Cylinder with piston rod protection structure according to claim 1, characterized in that a sealing structure is provided between the protective cover (5) and the piston rod (2).
8. The oil cylinder with the piston rod protection structure according to claim 1, wherein a rodless cavity is formed between the piston rod (2), the piston (3) and the bottom of the cylinder barrel (1), a rod cavity is formed between the piston rod (2), the piston (3), the guide sleeve (4) and the inner side wall of the cylinder barrel (1), a first oil duct (23) and a second oil duct (24) are arranged in the piston rod (2), one end of the first oil duct (23) is communicated with the rodless cavity, and the second oil duct (24) is communicated with the rod cavity.
9. Cylinder with piston rod protection structure according to claim 8, characterized in that the inner side wall of the end of the piston (3) remote from the bottom of the cylinder (1) is provided with a guiding surface (31), the end of the guiding surface (31) remote from the bottom of the cylinder (1) is inclined towards the direction remote from the piston rod (2), and the end of the second oil duct (24) for communicating with the rod cavity is opposite to the guiding surface (31).

Description

Oil cylinder with piston rod protection structure Technical Field The application relates to the technical field of shield tunneling machine equipment, in particular to an oil cylinder with a piston rod protection structure. Background The shield tunneling machine equipment is important construction equipment for underground tunnel engineering construction, an excavation face is stabilized by pressurizing muddy water or slurry, a sealing partition plate is arranged behind a cutter disc of the shield tunneling machine equipment, a slurry water chamber is formed between the shield tunneling machine equipment and the excavation face, slurry is filled in the slurry water chamber, excavated soil materials and the slurry are mixed and conveyed to an out-hole separation plant by a slurry pump. In order to ensure smooth mud circulation, stones and mud clusters cut by the cutterhead in the mud water chamber are required to be crushed again, so that large-particle-size broken stones are prevented from entering a mud conveying pipeline to block a mud conveying pipe, and parts of a mud circulation system are damaged, and the normal operation of the crushing system is guaranteed to ensure the normal operation of a mud shield. Along with the shield tunneling machine going deep into the underground 100m muddy water environment, the surrounding muddy water pressure is more than 1MPa, wherein the crusher oil cylinder needs to be integrally immersed in muddy water, and the piston rod enters the oil cylinder for a long time to damage and seal, so that the oil cylinder operation is influenced. Disclosure of utility model The technical problem to be solved by the utility model is that a crusher cylinder in a shield machine is immersed in muddy water for a long time, and the muddy water easily enters between a piston rod and a cylinder body to cause damage to the inside of the cylinder. Therefore, the utility model provides the oil cylinder with the piston rod protection structure. The technical scheme adopted for solving the technical problems is as follows: an oil cylinder with a piston rod protection structure comprises, A cylinder tube, and The piston rod is inserted into the cylinder barrel and slides along the axial direction of the cylinder barrel; the piston is arranged at one end of the piston rod; the protection cover is arranged on the outer side of the cylinder barrel, one end of the protection cover is restrained by the sliding pair of the cylinder barrel (1), the other end of the protection cover is fixed with the piston rod, the protection cover can move along with the piston rod, and one end of the protection cover, fixed with the piston rod, is in sliding fit with the cylinder barrel along the axial direction of the cylinder barrel. Further, a water cavity is formed between the protective cover and the outer side wall of the cylinder barrel and between the protective cover and the piston rod, and a flushing port for injecting water into the water cavity is formed in the protective cover. Further, the water pressure P 1 in the water chamber is greater than the muddy water pressure P 0 in the external environment. Further, be provided with spacing step on the piston rod, be provided with the first spacing face that sets up towards the cylinder bottom on the spacing step, be provided with the second spacing face on the protection casing, first spacing face is relative with the second spacing face. Further, one end of the cylinder opening of the cylinder barrel is provided with a guide sleeve, and the guide sleeve is positioned between the piston rod and the cylinder barrel. Further, the guide sleeve is provided with the face of dodging away from the terminal surface of cylinder bottom, the one end that dodges the face and be close to the cylinder lateral wall sets up towards the slope of cylinder bottom, the water gap is relative with dodging the face. Further, a sealing structure is arranged between the protective cover and the piston rod. Further, a rodless cavity is formed among the piston rod, the piston and the bottom of the cylinder barrel, a rod cavity is formed among the piston rod, the piston, the guide sleeve and the inner side wall of the cylinder barrel, a first oil duct and a second oil duct are arranged in the piston rod, one end of the first oil duct is communicated with the rodless cavity, and the second oil duct is communicated with the rod cavity. Further, the inside wall of the end that the piston kept away from the cylinder bottom is provided with the guide surface, the one end that the guide surface kept away from the cylinder bottom is towards the direction slope setting of keeping away from the piston rod, the second oil duct is used for being opposite with the guide surface with the one end that has the pole chamber intercommunication. The protective cover capable of moving along with the piston rod is arranged, the water cavity is arranged between the protective cover and the cylinder barre