CN202031915U

CN202031915U - Double-acting multistage hydraulic cylinder

Info

Publication number: CN202031915U
Application number: CN2011200761292U
Authority: CN
Inventors: 牟太有
Original assignee: JULI (LUZHOU) HYDRAULIC INDUSTRIAL Co Ltd
Current assignee: JULI (LUZHOU) HYDRAULIC INDUSTRIAL Co Ltd
Priority date: 2011-03-22
Filing date: 2011-03-22
Publication date: 2011-11-09
Anticipated expiration: 2021-03-22

Abstract

The utility model discloses a double-acting multistage hydraulic cylinder comprising an outer cylinder barrel, a guide sleeve, an outer end cover, an inner cylinder barrel, an inner end cover as well as a piston rod and a piston which are mounted in the inner cylinder barrel, wherein oil inlets are arranged on all the outer cylinder barrel, the outer end cover and the inner end cover; and an oil passage communicated with the inner cavities of the outer and the inner cylinder barrels is arranged in the side wall of the inner cylinder barrel. The double-acting multistage hydraulic cylinder is characterized in that the oil passage is an axial long groove shaped oil passage. The double-acting multistage hydraulic cylinder has the advantages of stable operating condition, high stability and low manufacture cost.

Description

The double-action multistage hydraulic cylinder

Technical field

The utility model relates to a kind of double-action multistage hydraulic cylinder.

Background technique

Multistage hydraulic cylinder can be realized the stroke longer than single-stage oil cylinder, thereby be used widely under the situation of installing space anxiety because of its compact structure in given installing space; The present double-action multistage hydraulic cylinder that generally adopts, comprise outer cylinder, guide sleeve, outer end cap, inner cylinder tube, inner end cap, be loaded on piston rod and piston in the inner cylinder tube, on outer cylinder, outer end cap and inner end cap, be equipped with filler opening, filler opening on outer cylinder and the inside and outside end cap lays respectively at the both sides of piston, is provided with the ring oil channel that is communicated with outer cylinder inner chamber and inner cylinder tube inner chamber in the sidewall of inner cylinder tube; When oil cylinder is regained, when being the withdrawal of piston rod bringing onto load, the working pressure of ring oil channel is higher, the ring oil channel makes that the wall thickness of inner cylinder tube is thinner, and inner cylinder tube is yielding, can not regain when serious at all, disorderly level phenomenon appears, reliability is relatively poor, and the processing technology of ring oil channel is comparatively complicated, causes the manufacture cost of oil cylinder higher.

The model utility content

The purpose of this utility model is at the prior art above shortcomings, and a kind of double-action multistage hydraulic cylinder is provided, and it has, and operating mode is stable, good reliability, advantage that manufacture cost is lower.

For achieving the above object, double-action multistage hydraulic cylinder of the present utility model, comprise outer cylinder, guide sleeve, outer end cap, inner cylinder tube, inner end cap, be loaded on piston rod and piston in the inner cylinder tube, on outer cylinder, outer end cap and inner end cap, be equipped with filler opening, in the sidewall of inner cylinder tube, be provided with the oil channel that is communicated with outer cylinder inner chamber and inner cylinder tube inner chamber, it is characterized in that described oil channel is axial long trough oil duct.

Oil channel of the present utility model is axial long trough oil duct, compared with prior art, and under the identical situation of wall thickness, intensity effect to inner cylinder tube is less, and when oil cylinder was regained, inner cylinder tube was not yielding, disorderly level phenomenon can not occur, have that operating mode is stable, the advantage of good reliability; And long trough oil duct processing technology is comparatively simple, and manufacture cost is lower.

Description of drawings

Fig. 1 is the utility model embodiment's a plan view.

Fig. 2 is the A-A sectional drawing of Fig. 1 after amplifying.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

As shown in Figure 1 and Figure 2, this double-action multistage hydraulic cylinder, comprise outer cylinder 1, guide sleeve 2, outer end cap 3, inner cylinder tube 4, inner end cap 5, be loaded on piston rod 6 and piston 7 in the inner cylinder tube 4, on outer cylinder 1, be provided with filler opening 8, on outer end cap 3, be provided with filler opening 9, be provided with filler opening 10 on inner end cap 4, be provided with the oil channel 11 that is communicated with outer cylinder inner chamber and inner cylinder tube inner chamber in the sidewall of inner cylinder tube 4, described oil channel 11 is axial long trough oil duct.

During use, filler opening 9 and filler opening 10 oil-feeds under pressure, promote inner cylinder tube 4 and piston rod 6 integral body and stretch out, and when inner cylinder tube 4 moved to the predetermined stroke terminal point, piston rod 6 began to stretch out; When fluid when filler opening 8 and oil channel 11 flows into inner cylinder tubes 4 inner chambers, piston rod 6 is regained earlier, regains inner cylinder tube 4 again, when oil cylinder reclaimed, the intensity effect of 11 pairs of inner cylinder tubes 4 of oil channel was less, and inner cylinder tube is not yielding, disorderly level phenomenon can not occur, have that operating mode is stable, the advantage of good reliability; And long trough oil duct processing technology is comparatively simple, and manufacture cost is lower.

Claims

1. double-action multistage hydraulic cylinder, comprise outer cylinder, guide sleeve, outer end cap, inner cylinder tube, inner end cap, be loaded on piston rod and piston in the inner cylinder tube, on outer cylinder, outer end cap and inner end cap, be equipped with filler opening, in the sidewall of inner cylinder tube, be provided with the oil channel that is communicated with outer cylinder inner chamber and inner cylinder tube inner chamber, it is characterized in that described oil channel is axial long trough oil duct.