CN2500868Y

CN2500868Y - Energy-saving changeable section hydro-cylinder

Info

Publication number: CN2500868Y
Application number: CN 01252310
Authority: CN
Inventors: 易斌
Original assignee: Beili Industry And Trade Co ltd
Current assignee: Beili Industry And Trade Co ltd
Priority date: 2001-10-30
Filing date: 2001-10-30
Publication date: 2002-07-17
Anticipated expiration: 2011-10-30

Abstract

The utility model relates to an energy saving hydro cylinder with variable section which is for solving the problem of energy saving when the hydro cylinder works and the problem of drive system miniaturization. The hydro cylinder with variable section is consisted by three oil cavities namely a pressure working cavity, a small area working cavity and an assist working cavity; the small area working cavity is used for fast forward with no load; when the hydro cylinder works at normal speed namely power output, the small area working cavity and the pressure working cavity work simultaneously; when the hydro cylinder works in the state of fast reverse without load, a differential is formed whose working area difference is the working area of the small area working cavity. When the hydro cylinder with variable section is in the fast working condition, due to that the working area is smaller, the oil pressure for overcoming resistance is correspondingly higher, but the power consumption is basically uniform with the power consumption of power output. Therefore, the utility model provides the advantages of high converting efficiency of energy, simplified structure of hydraulic pressure system, greatly reduced volume of hydraulic pressure system, reduced manufacture precision requirements, and wide application potential. Thus, the utility model is in particular suitable to the hydraulic pressure instrument which requires miniaturization or micromation for structure and volume.

Description

A kind of energy-conservation variable cross section oil cylinder

Technical field: the utility model relates to a kind of energy-conservation variable cross section oil cylinder.

Background technique: the basic work characteristics of oil cylinder is that F.F. (zero load)-worker advances (exerting oneself)-rewind down (zero load), and no load speed is fast, and work speed is slow.Need when traditional oil cylinder F.F. or rewind down with the low pressure and mass flow oil sources is provided, when advancing, the worker need provide the high-pressure low-flow oil sources, when the configuration oil pump, must select its discharge capacity by quick service condition, select delivery pressure by the requirement of worker's turnover power, consequently high pressure is at a slow speed the time, and unnecessary flow is in the pressure underflow stream, cause energy loss, on the other hand, the power consumpiton difference was bigger when operation advanced to move with the worker fast, and system effectiveness is low.Adopt the hydraulic system of variable displacement pump control, when moving fast, provide low pressure and mass flow as required, high-pressure low-flow is provided when the worker advances as required, can solve power saving, but always have the pump structure complexity, system's components and parts still need be by big flow configuration, expense is higher, and structure, volume are bigger.

Summary of the invention: the utility model be for solve oil cylinder when work energy-conservation with and the hydraulic driving system miniaturization issues, this variable cross section oil cylinder is made up of three oil pockets, i.e. pressure active chamber, small size active chamber and back work chamber.This variable cross section oil cylinder is when quick operating mode, because work area is less, it is corresponding higher to overcome the required oil pressure of resistance, basically identical when its power consumpiton and worker pass in and out power, the energy conversion efficiency height has been simplified the structure of hydraulic system, has reduced the volume of hydraulic system greatly, reduce the accuracy of manufacturing requirement, had application potential widely.

Description of drawings: figure one, the utility model variable cross section energy saving cylinder structural representation.

Embodiment: this variable cross section oil cylinder is made up of back work chamber (chamber), pressure active chamber (chamber) and three oil pockets of small size active chamber (chamber) and chamber (A3 chamber) three oil pockets and forced induction valve.The A1 chamber is formed by lower end cap 6, cylinder body 3, lower piston rod 5, piston 4 sealings, and work area is A1; The A2 chamber by 3, piston 4, upper end cap 1, upper piston rod 2 sealings form, work area is A2; Upper and lower piston rod 2,5 and plug 4 are fixed as one, and are fixed with plunger on the upper end cap 1, form the A3 chamber with upper piston rod 2 sealings, and its work area is A3; A1＞A2 wherein, A3＞A1-A2; The A3 chamber is provided with logical hydraulic fluid port P1, and the A1 chamber is provided with logical hydraulic fluid port P2, and the A2 chamber is provided with logical hydraulic fluid port P3.Piston 4 is provided with forced induction valve 7, the break-make of control A1, A2, three oil pockets of A3.

The forced induction valve original state communicates A1 chamber and A2 chamber, and both A3 are obstructed.When the rising of A3 chamber oil pressure, during greater than initial tension of spring, the forced induction valve switched path is linked up A2 chamber, A3 chamber, and both and A1 chamber disconnect.

When oil cylinder stopped, A1, A2 chamber communicated with the P2 mouth, and the A3 chamber communicates with the P1 mouth.Pressure oil enters oil cylinder A3 chamber through P1, and when P2 led to oil return, the oil cylinder active area was A3, oil cylinder F.F. (zero load).When oil cylinder runs into load, A3 chamber oil pressure will raise, and this moment, forced induction valve was linked up A2 and A3, the oil cylinder active area increases A2+A3, and its ouput force increases, and speed slows down, the oil cylinder worker advances (exerting oneself), forced induction valve 7 initial tension of spring sizes, the speed change point of decision oil cylinder.When the P2 mouth switches to pressure oil, during the logical fuel tank of P1 mouth, forced induction valve 7 place's initial positions, pressure oil is injected into A1 chamber and A2 chamber, and this moment, oil cylinder active area A1-A2 formed differentially, was subjected to force direction upwards, oil cylinder realization rewind down.Shown in figure one, also can cancel forced induction valve, enable hydraulic fluid port P3, by external control element, during F.F., P1 leads to pressure oil, and P2, P3 are communicated with; When the worker advances, the logical simultaneously pressure oil of P1, P3; During rewind down, P2, P3 lead to pressure oil, and P1 leads to oil return.Working principle is the same.

This variable cross section oil cylinder is when quick operating mode, because work area is less, it is corresponding higher to overcome the required oil pressure of resistance, basically identical when its power consumpiton and worker pass in and out power, energy conversion efficiency height.This oil cylinder only needs metering pump can realize that the F.F.-worker of oil cylinder advances-the rewind down operating mode, under identical running parameter, oil pump capacity only is about 20% of the required configuration oil pump of traditional oil cylinder, simplified the structure of hydraulic system, reduced the volume of hydraulic system greatly, be specially adapted to structure and volume requirement miniaturization or microminiaturized Hydraulic power tools.And the structure of this oil cylinder has reduced the accuracy of manufacturing requirement, has application potential widely.

Claims

1, a kind of energy-conservation variable cross section oil cylinder, it is characterized in that: described oil cylinder is made up of three oil pockets, i.e. pressure active chamber, small size active chamber and back work chamber; Utilize the work of described small size active chamber during the zero load F.F.; The worker advances to utilize when promptly exerting oneself small size active chamber and pressure active chamber to work simultaneously; Form differentially during unloaded rewind down, the working surface product moment is a small size active chamber work area.

2, variable cross section oil cylinder as claimed in claim is characterized in that: described small size active chamber is to constitute by described upper piston rod with plunger that inside that upper end cap is fixed as one is provided with oil duct.

3, variable cross section oil cylinder as claimed in claim is characterized in that: described back work chamber is to be made of described piston and lower piston rod, cylinder body.

4, variable cross section oil cylinder as claimed in claim is characterized in that: described pressure active chamber is to be made of piston and upper piston rod, cylinder body and plunger.

5, variable cross section oil cylinder as claimed in claim is characterized in that: be provided with change a job into forced induction valve of control oil cylinder F.F. in the described piston.

6, variable cross section oil cylinder as claimed in claim is characterized in that: described small size active chamber, pressure active chamber, back work chamber are respectively equipped with the hydraulic fluid port that is communicated with external valve.