CN201358976Y

CN201358976Y - Novel two-way hydraulic cylinder

Info

Publication number: CN201358976Y
Application number: CNU2008200249936U
Authority: CN
Inventors: 万国全; 胡岸清; 魏庆保; 程阿芬
Original assignee: Shandong Ruichi Machinery Co Ltd
Current assignee: Shandong Ruichi Machinery Co Ltd
Priority date: 2008-07-11
Filing date: 2008-07-11
Publication date: 2009-12-09
Anticipated expiration: 2018-07-11

Abstract

The utility model discloses a novel two-way hydraulic cylinder which comprises a cylinder body, a guide sleeve as well as a piston and a piston rod that are sheathed in the cylinder body, and floating variable diameter throttling mechanisms are respectively positioned at stroke end positions. The variable diameter throttling mechanisms can lead the oil in an oil return cavity to generate pressure under throttling action, and then the mechanical energy of the piston part which continuously moves is absorbed by the oil in the oil return cavity, so that internal pressure generated inside the oil return cavity withstands inertia force; due to variable diameter structure, the throttling area is gradually reduced when the stroke is increased, the absorption intensity of kinetic energy is more uniform, mechanical shock and vibration can be reduced, and overlarge buffering shock pressure is avoided. Floating means that a plunger piston in a buffer gear can automatically do micro adjustment along the radial direction, best throttling effect can be achieved, and the manufacturing difficulty is reduced, so that the piston is effectively avoided impacting the two ends of the cylinder body when running is ended, and related parts are protected.

Description

Novel two-way hydraulic cylinder

Technical field

The utility model belongs to the hydraulic element field, the oil hydraulic cylinder that particularly a kind of engineering machinery is used.

Background technique

At present, the action of equipment in the engineering machinery adopts the reciprocating double-action oil hydraulic cylinder that hydraulic pressure can be transformed into mechanical energy mostly, the turning to, overturn, excavate, hoist etc. of Control work device.The reciprocating double-action hydraulic cylinder structure of using in the existing engineering machinery is simple, because Environmental Conditions is abominable, especially for motion speed and the higher oil cylinder of working pressure, when piston runs to the ultimate position, bump cylinder body two ends produce very big impact force and vibrations, oil cylinder and complete machine are brought adverse effect, cause the oil cylinder damage of components easily, even cause serious accident, can not adapt to the effect of bad working environment and impulsive load, caused reliability low, problems such as leakage of oil is serious, above problem causes oil cylinder maintenance cost height, client complains, and has restricted the development of China's engineering machinery main frame.

Summary of the invention

The purpose of this utility model provides a kind of novel two-way hydraulic cylinder that the cylinder body two ends is impacted can effectively alleviate or eliminate the piston operation time with regard to being defective at above-mentioned prior art.

Its technical solution is as follows:

Novel two-way hydraulic cylinder, it comprises cylinder body, guide sleeve and is sleeved on piston, piston rod in the cylinder body that above-mentioned piston two ends are respectively arranged with the reducing throttle mechanism that floats with respect to the cylinder body two ends.Above-mentioned reducing throttle mechanism can make the oil back chamber inner fluid produce pressure because of throttling action, the mechanical energy that continue the piston element of motion this moment is absorbed by the fluid of oil back chamber, the internal pressure that produces in the oil back chamber is resisted mutually with inertial force, owing to be variable-diameter structure, along with orifice size is progressively dwindled in the increase of stroke, the strength ratio that kinetic energy is absorbed is more even, has not only reduced mechanical shock and vibrations but also can avoid excessive shock absorbing pressure.So-called float is exactly that plunger in the damping mechanism can radially carry out small adjustment automatically, can make the restriction effect The Gift of Being the Best You Can Be and reduce manufacture difficulty, effectively avoids piston impact to the cylinder body two ends when rundown, the protection associated components.

As improvement of the present utility model, described piston external diameter is installed and is received dirty ring.The Sealing of piston and supporting member are arranged on two and receive between the dirty ring, above-mentionedly receive dirty ring and can stop that fluid or other foreign material contact with supporting member with Sealing, thereby can effectively improve the working life and the reliability of piston seal.

As further improvement of the utility model, be sealed into following structure between above-mentioned piston rod and the guide sleeve, be disposed with from outside to inside that skeleton is dustproof, primary seal, buffering high pressure sealing, composite bush.

Above-mentioned buffering high pressure sealing can prevent that impacting with high pressure from damaging primary seal, prolongs the working life of primary seal; Dustproof all pollutants such as extraneous dust, water that can effectively stop of skeleton enter in the oil cylinder, guarantee the oil cylinder turbidity test; Primary seal prevents that oil cylinder internal pressure oil from leaking outside; Composite bush directly contacts with piston rod, bears the piston rod lateral force, guarantees Sealing decrement unanimity in a circumferential direction, improves sealing effect.

Description of drawings

Figure is the utility model structural representation.

Embodiment

As shown in the figure, the utility model mainly comprises cylinder body 1, and it is cylinder bottom 3 that cylinder body 1 an interior end is provided with guide sleeve 2 the other ends, and piston rod 4 and piston 5 are sleeved in the inner chamber of cylinder block, Sealing 51, piston support ring 52 are arranged on the cock body of above-mentioned piston 5, respectively be provided with one at the two ends of cock body 5 and receive dirty ring 53; Be sealed into following structure between above-mentioned guide sleeve 2 and the piston rod 4: be followed successively by from outside to inside that skeleton is dustproof 41, primary seal 42, buffering high pressure sealing 43, composite bush 44; Above-mentioned piston 5 two ends are respectively arranged with the reducing throttle mechanism that floats.

Above-mentionedly receive dirty ring and can adopt cast-iron alloy or engineering plastics etc. suitable material is made.

The utility model includes but are not limited to above mode of execution, and other conspicuous variations all should not exceed protection domain of the present utility model.

Claims

1, novel two-way hydraulic cylinder, it comprises cylinder body, guide sleeve and be sleeved on piston, piston rod in the cylinder body, it is characterized in that: described piston two ends are respectively arranged with the reducing throttle mechanism that floats with respect to the cylinder body two ends.