CN202158034U

CN202158034U - Oil cylinder with floating piston

Info

Publication number: CN202158034U
Application number: CN2011202826520U
Authority: CN
Inventors: 阙升华; 姜晓静; 邓辉辉; 周鑫
Original assignee: SHANGHAI HOLD HEAVY INDUSTRY Co Ltd
Current assignee: SHANGHAI HONGDELI HEAVY INDUSTRY CO., LTD.
Priority date: 2011-08-05
Filing date: 2011-08-05
Publication date: 2012-03-07
Anticipated expiration: 2021-08-05

Abstract

The utility model discloses an oil cylinder with a floating piston. The oil cylinder comprises a cylinder barrel, an oil cylinder end cover, a piston rod and a fixed piston, wherein the fixed piston is fixed at one end part of the piston rod positioned in the cylinder barrel. The oil cylinder is characterized in that the floating piston capable of axially sliding along the piston rod is arranged between the piston rod and the cylinder barrel. The oil cylinder provided by the utility model has the advantages of simple structure, low pressure resistant requirement of a hydraulic system, and low manufacturing cost.

Description

The oil cylinder of band floating piston

Technical field

The utility model relates to a kind of supporting leg telescopic oil cylinder of concrete mixer, particularly discloses a kind of oil cylinder with floating piston.

Background technique

The support system of concrete mixer is made up of four supporting legs and underframe, when pump concrete and travelling state switching, need carry out the expansion and the gathering of supporting leg, so be provided with the oil cylinder that supporting leg launches and draws in.

The supporting leg of existing pump truck launches and draws oil cylinder in and all adopt common two-way cylinder, common two-way cylinder because of rodless cavity pressure oil active area greater than rod chamber pressure oil active area; When piston rod stretched out, the hydraulic oil pressure that acts on rodless cavity was made as P1, and when piston rod was withdrawn, the hydraulic oil pressure that acts on rod chamber was made as P2; When P1=P2, the pulling force that produces when the thrust that produces when oil cylinder stretches out is regained greater than oil cylinder.

And for the telescopic outrigger of pump truck, the oil cylinder pulling force that needs when the cylinder thrust that needs when stretching out is regained less than supporting leg, thus have only the pressure that improves hydraulic system, thus need the voltage endurance capability of all elements of hydraulic system of raising, increased cost.

Summary of the invention

The purpose of the utility model is to overcome the problem that exists in the existing technology; Provide a kind of simple in structure; Need not to improve the voltage endurance capability of all elements of hydraulic system; Just can realize the purpose of the oil cylinder pulling force when its cylinder thrust was regained less than supporting leg when the pump truck telescopic outrigger stretched out, thus the oil cylinder of the band floating piston that reduces cost.

The utility model is achieved in that a kind of oil cylinder with floating piston; Comprise cylinder barrel, cylinder cover, piston rod, fixed piston; Said fixed piston is fixed on the end end that piston rod is positioned at cylinder barrel, it is characterized in that: being provided with between said piston rod and the cylinder barrel can be along piston rod floating piston in axial sliding.

The external diameter of said piston rod is less than the external diameter of fixed piston.

The beneficial effect of the utility model is: piston rod of the utility model and floating piston are unfixing axially, and promptly floating piston can be free to slide along piston rod; As shown in Figure 1; When pressure oil promotion piston rod stretches out; The effective active area of its pressure oil is: the end area S1 of fixed piston deducts the face area of fixed piston and the difference S2 of piston rod section area; Be the big or small S4 that the size of the effective active area of pressure oil on fixed piston equals the piston rod section area; If the face area of floating piston is S3, then when pressure oil promotes floating piston piston rod is regained, its pressure oil acts on the face area S3 that effective active area on the floating piston is floating piston; When under the effect of equal pressure oil; The size of sectional area S4 through designing different S1, S2, S3 and piston rod; The thrust that oil cylinder produces in the time of can obtaining pulling force that oil cylinder produces stretch out greater than piston rod when piston rod is regained, thus when rod chamber advances pressure oil, need not to increase the pressure of hydraulic system; Reduced the requirement of withstand voltage of hydraulic system, the cost of the product of minimizing.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 the utility model is the structural representation of floating piston when being pushed to cylinder cover.

Fig. 3 the utility model is the structural representation of fixed piston when promoting piston rod and stretching out outward.

Fig. 4 is that the utility model passes through the structural representation that floating piston promotes the time receiving in the piston rod.

Among the figure: 1, cylinder cover; 2, cylinder barrel; 3, piston rod; 4, floating piston; 5, fixed piston; 6, filler opening A; 7, filler opening B; The end area of S1, fixed piston; The face area of S2, fixed piston and piston rod section area poor; The face area of S3, floating piston; The sectional area of S4, piston rod.

Embodiment

According to Fig. 1 ~ Fig. 4; The utility model comprises cylinder barrel 2, cylinder cover 1, piston rod 3, fixed piston 5; Said fixed piston 5 is fixed on the end end that piston rod 3 is positioned at cylinder barrel 2, and being provided with between said piston rod 3 and the cylinder barrel 2 can be along piston rod 3 floating piston 4 in axial sliding.The external diameter of said piston rod 3 is less than the external diameter of fixed piston 5.

As shown in Figure 2, when filler opening A6 oil-feed, hydraulic oil is shifted floating piston 4 onto cylinder cover 1 place earlier; Promote piston rods 3 toward overhanging through fixed piston 5 then, this moment, the effective active area of pressure oil was: S1-S2, and wherein S1 is the end area of fixed piston, S2 is face area and piston rod section area poor of fixed piston, like Fig. 3; When the oil-feed of filler opening B7 mouth, promote piston rod 3 toward interior receipts through floating piston 4, this moment, the effective active area of pressure oil was the face area S3 of floating piston, like Fig. 4.

Because of the utility model is provided with floating piston 4; Under equal hydraulic oil pressure action; Through the end area S1 of design different fixed piston, face area and the difference S2 of piston rod section area, the face area S3 of floating piston and the sectional area S4 of piston rod of fixed piston; The thrust that the pulling force that produces when oil cylinder is regained produces when stretching out greater than oil cylinder; Thereby need not increase under the situation of hydraulic system voltage endurance capability, well solved the thrust problem that pulling force that the pump truck telescopic outrigger needs needs when stretching out when regaining.

Claims

1. oil cylinder with floating piston; Comprise cylinder barrel, cylinder cover, piston rod, fixed piston; Said fixed piston is fixed on the end end that piston rod is positioned at cylinder barrel, it is characterized in that: being provided with between said piston rod and the cylinder barrel can be along piston rod floating piston in axial sliding.

2. according to the oil cylinder of the described band floating piston of claim 1, it is characterized in that: the external diameter of said piston rod is less than the external diameter of fixed piston.