CN202348823U

CN202348823U - Compact double-stage double-action hydraulic cylinder

Info

Publication number: CN202348823U
Application number: CN2011204390910U
Authority: CN
Inventors: 王启香; 陈骏; 杨新明
Original assignee: JIANGSU CHENGUANG SUNDE HYDRAULIC EQUIPMENT CO Ltd
Current assignee: JIANGSU CHENGUANG SUNDE HYDRAULIC EQUIPMENT CO Ltd
Priority date: 2011-11-08
Filing date: 2011-11-08
Publication date: 2012-07-25
Anticipated expiration: 2021-11-08

Abstract

The utility model relates to a hydraulic cylinder, in particular to a compact double-stage double-action hydraulic cylinder. The hydraulic cylinder comprises a cylinder body, a first piston rod and a second piston rod, wherein the first piston rod is inserted in the cylinder body, and mainly comprises a piston head and a rod barrel which are welded together, an extension tube is fixed in the piston head, the piston head is provided with an oil hole and an oil passage communicating with the rod barrel, a first oil chamber is formed between the first piston rod and the cylinder body, an oil tube which is communicated with the oil hole is welded on the tail of the extension tube, the second piston rod is inserted in the rod barrel of the first piston rod, a second oil chamber is formed between the second piston rod and the rod barrel, the second piston rod is provided with an oil port and a cavity, the cavity is communicated with the second oil chamber via the oil port, the oil tube is extended into the cavity of the second piston rod, the orifice of the extended end of the oil tube is always located in the cavity, and the end of the second piston rod and the outer wall of the oil tube are sealed. Compared with the conventional ordinary double-stage double-action hydraulic cylinders, the compact double-stage double-action hydraulic cylinder has the advantages that: the overall structure is more compact and reasonable, and the size is greatly reduced.

Description

The compact type double-stage double-acting hydraulic cylinder

Technical field

The utility model relates to a kind of oil hydraulic cylinder, especially relates to a kind of compact type double-stage double-acting hydraulic cylinder.

Background technique

Existing double-stage double-acting hydraulic cylinder shown in Figure of description 2, includes cylinder body, first piston bar, second piston rod; The first piston bar is nested in the cylinder body, and and cylinder body between form first oil pocket, be with a spacer in that the first piston bar is embedded; Second piston rod is nested in this spacer; Form second oil pocket between such second piston rod and the spacer, simultaneously, also form diversion cavity between spacer and the first piston bar.First oil pocket, diversion cavity, second oil pocket, three chambeies are communicated with.When hydraulic cylinder piston rod bounced back, hydraulic oil at first charged into first oil pocket, charged into second oil pocket by diversion cavity again.Because first piston bar bar tube and spacer must be offered hydraulic fluid port; Therefore first piston bar bar tube and spacer must guarantee certain wall thickness; Could satisfy requirement of strength, so, under the prerequisite of the thickness that guarantees two oil pockets with assurance retraction oil pressure; Do the cylinder body of oil hydraulic cylinder more slightly to hold first piston bar, spacer and second piston rod with regard to having to, cause too fat to move and size huge of liquid cylinder entity structure.

The model utility content

The technical problem that the utility model will solve is: a kind of compact type double-stage double-acting hydraulic cylinder is provided, and purpose is to solve the problem that the cylinder body bore is thick, overall structure is too fat to move, volume is bigger that existing double-stage double-acting hydraulic cylinder is former because of self project organization thereby cause.

The utility model solves the technological scheme that its technical problem adopted: a kind of compact type double-stage double-acting hydraulic cylinder; Include cylinder body, first piston bar, second piston rod, the first piston bar is nested in the cylinder body, and the first piston bar is mainly formed by piston head and bar tube assembly welding; Be set with telescopic pipe in the piston head; And the oil duct that is provided with oilhole, communicates with the bar tube, forming first oil pocket between first piston bar and the cylinder body, the tail end of described telescopic pipe is welded with the oil pipe that communicates with oilhole; Second piston rod is nested in the bar tube of first piston bar; And and the bar tube of first piston bar between form second oil pocket, second piston rod has hydraulic fluid port and inner chamber, inner chamber is communicated with second oil pocket through hydraulic fluid port; Inner chamber and inserting end port that described oil pipe stretches into second piston rod are in the inner chamber all the time, the second piston rod head end and oil-pipe external wall sealing.

When hydraulic cylinder piston rod stretched out, hydraulic oil promoted the first piston bar, promoted second piston rod thereby get in the bar tube through the oil duct that communicates with the bar tube in the first piston bar piston head simultaneously; During the piston rod retraction; Hydraulic oil charges into first oil pocket; Promote first piston bar retraction, get into the oil pipe that communicates with oilhole through the oilhole in the first piston bar piston head simultaneously, charge into the inner chamber of second piston rod again; Hydraulic fluid port via second piston rod finally charges into second oil pocket then, thereby promotes second piston rod retraction.

In order further to improve the retraction oil pressure of first piston bar, telescopic pipe has the corresponding ring cavity of oil-hole location in the piston head with the first piston bar.

The beneficial effect of the utility model is: this compact type double-stage double-acting hydraulic cylinder is compared from structure with existing common double-stage double-acting hydraulic cylinder; It at first is the spacer of having cancelled between the first piston bar and second piston rod (also just not had the diversion cavity between first piston bar and the spacer simultaneously); The 2nd, the oilhole of first piston bar is opened in its piston head; The wall thickness of first piston bar bar tube is able to cut down like this, and piston head footpath also just is able to reduce.In view of above-mentioned two factors, the double-stage double-acting hydraulic cylinder cylinder body bore of the utility model is able to significantly reduce, and the liquid cylinder entity structure becomes more that compact and reasonable, volume significantly reduce.

Description of drawings

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

Fig. 1 is the sectional structure schematic representation of the utility model;

Fig. 2 is the sectional structure schematic representation of existing double-stage double-acting hydraulic cylinder.

Among the figure: 1. cylinder body 2. first piston bar 2-1. piston head 2-1-1. oilhole 2-1-2. oil duct 2-2. bar tubes 3. second piston rod 3-1. hydraulic fluid port 3-2. inner chambers 4. telescopic pipe 4-1. ring cavities 5. oil pipes 6. spacers

Embodiment

A kind of compact type double-stage double-acting hydraulic cylinder, as shown in Figure 1, it includes cylinder body 1, first piston bar 2, second piston rod 3; First piston bar 2 is nested in the cylinder body 1; First piston bar 2 is mainly formed by piston head 2-1 and bar tube 2-2 assembly welding, is set with telescopic pipe 4 among the piston head 2-1, and the oil duct 2-1-2 that is provided with oilhole 2-1-1, communicates with bar tube 2-2; Form first oil pocket between first piston bar 2 and the cylinder body 1; The tail end of telescopic pipe 4 is welded with oil pipe 5, the second piston rods 3 that communicate with oilhole 2-1-1 and is nested among the bar tube 2-2 of first piston bar 2, and and the bar tube 2-2 of first piston bar 2 between form second oil pocket; Second piston rod 3 has hydraulic fluid port 3-1 and inner chamber 3-2; Inner chamber 3-2 is communicated with second oil pocket through hydraulic fluid port 3-1, and inner chamber 3-2 and inserting end port that oil pipe 5 stretches into second piston rod 3 are among the inner chamber 3-2 all the time, second piston rod, 3 head ends and the sealing of oil pipe 5 outer walls.

Telescopic pipe 4 has the corresponding ring cavity 4-1 in oilhole 2-1-1 position among the piston head 2-1 with first piston bar 2.

Claims

1. compact type double-stage double-acting hydraulic cylinder; Include cylinder body (1), first piston bar (2), second piston rod (3); It is characterized in that: first piston bar (2) is nested in the cylinder body (1); First piston bar (2) is mainly formed by piston head (2-1) and bar tube (2-2) assembly welding, is set with telescopic pipe (4) in the piston head (2-1), and the oil duct (2-1-2) that is provided with oilhole (2-1-1), communicates with bar tube (2-2); Form first oil pocket between first piston bar (2) and the cylinder body (1); The tail end of described telescopic pipe (4) is welded with the oil pipe (5) that communicates with oilhole (2-1-1), and second piston rod (3) is nested in the bar tube (2-2) of first piston bar (2), and and the bar tube (2-2) of first piston bar (2) between form second oil pocket; Second piston rod (3) has hydraulic fluid port (3-1) and inner chamber (3-2); Inner chamber (3-2) is communicated with second oil pocket through hydraulic fluid port (3-1), and inner chamber (3-2) and inserting end port that described oil pipe (5) stretches into second piston rod (3) are in the inner chamber (3-2) all the time, second piston rod (3) head end and the sealing of oil pipe (5) outer wall.

2. compact type double-stage double-acting hydraulic cylinder according to claim 1 is characterized in that: described telescopic pipe (4) has the corresponding ring cavity in oilhole (2-1-1) position (4-1) in the piston head (2-1) with first piston bar (2).