CN102410279A - Double-stage double-acting hydraulic cylinder - Google Patents

Double-stage double-acting hydraulic cylinder Download PDF

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Publication number
CN102410279A
CN102410279A CN2011103742673A CN201110374267A CN102410279A CN 102410279 A CN102410279 A CN 102410279A CN 2011103742673 A CN2011103742673 A CN 2011103742673A CN 201110374267 A CN201110374267 A CN 201110374267A CN 102410279 A CN102410279 A CN 102410279A
Authority
CN
China
Prior art keywords
piston rod
oil
double
cylinder
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011103742673A
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Chinese (zh)
Inventor
刘洪�
张庚娣
刘勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Longcheng Hongli Hydraulic Equipment Co Ltd
Original Assignee
Jiangsu Longcheng Hongli Hydraulic Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Longcheng Hongli Hydraulic Equipment Co Ltd filed Critical Jiangsu Longcheng Hongli Hydraulic Equipment Co Ltd
Priority to CN2011103742673A priority Critical patent/CN102410279A/en
Publication of CN102410279A publication Critical patent/CN102410279A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a double-stage double-acting hydraulic cylinder. The hydraulic cylinder comprises a cylinder body, a first piston rod and a second piston rod, wherein the first piston rod is sleeved in the cylinder body and forms a first oil cavity with the cylinder body; an inner piston is fixedly arranged in the head end of the first piston rod; an oil hole corresponding to an oil port of the first piston rod and an oil duct communicated with an inner cavity of the first piston rod are arranged in the inner piston; an oil pipe communicated with the oil hole is also welded in the inner piston; the second piston rod is sleeved in the first piston rod and forms a second oil cavity with the first piston rod; the second piston rod is also provided with an oil port and an inner cavity; the inner cavity is communicated with the second oil cavity through the oil port; the oil pipe extends into the inner cavity of the second piston rod and the extending port is always in the inner cavity; and the head end of the second piston rod is sealed with the outer wall of the oil pipe. Compared with the existing common double-stage double-acting hydraulic cylinder, the double-stage double-acting hydraulic cylinder in the invention has the advantages that the overall structure is more compact and reasonable, and the volume is significantly reduced.

Description

Double-stage double-acting hydraulic cylinder
Technical field
The present invention relates to a kind of oil hydraulic cylinder, especially relate to a kind of 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 be 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, forms 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.
Summary of the invention
The technical problem that the present invention will solve is: a kind of novel double-stage double-acting hydraulic cylinder is provided, and purpose is to solve existing double-stage double-acting hydraulic cylinder because of former thereby thick, too fat to move, the bulky problem of overall structure of cylinder body bore that cause of self project organization.
The technical solution adopted for the present invention to solve the technical problems is: a kind of double-stage double-acting hydraulic cylinder; Include cylinder body, first piston bar and second piston rod, the first piston bar be nested in the cylinder body and and cylinder body between form first oil pocket, be provided with interior plug at the head end internal fixation of first piston bar; In have and corresponding oilhole of the hydraulic fluid port of first piston bar and the oil duct that communicates with the inner chamber of first piston bar in the plug; In also be welded with the oil pipe that communicates with oilhole in the plug, second piston rod is nested in the first piston bar, and and the first piston bar between form second oil pocket; Second piston rod also has hydraulic fluid port and inner chamber; Inner chamber is communicated with second oil pocket through hydraulic fluid port, and inner chamber and inserting end port that described oil pipe stretches into second piston rod are in this 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, thereby the inner chamber that gets into the first piston bar through the oil duct in the interior plug simultaneously promotes second piston rod; When the needs piston rod bounces back; Hydraulic oil charges into first oil pocket; Promote first piston bar retraction, hydraulic fluid port and the oilhole in the interior plug through the first piston bar gets into oil pipe simultaneously, charges 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.
The invention has the beneficial effects as follows: this double-stage double-acting hydraulic cylinder is compared with existing common double-stage double-acting hydraulic cylinder; Lacked the spacer (also just not had the diversion cavity between first piston bar and the spacer) between the first piston bar and second piston rod; Therefore the hydraulic cylinder body bore 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 present invention is described further.
Fig. 1 is the sectional structure schematic representation of double-stage double-acting hydraulic cylinder of the present invention;
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, 3. second piston rod, 4. in plug, 4-1. oilhole, 4-2. oil duct, 5. oil pipe, 6. spacer.
Embodiment
Combine accompanying drawing that the present invention is done further detailed explanation now.These accompanying drawings are the schematic representation of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
A kind of 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 be nested in the cylinder body 1 and and cylinder body 1 between form first oil pocket; Plug 4 in the head end internal fixation of first piston bar 2 is provided with has in the interior plug 4 and corresponding oilhole 4-1 of the hydraulic fluid port of first piston bar 2 and the oil duct 4-2 that communicates with the inner chamber of first piston bar 2, also is welded with the oil pipe 5 that communicates with oilhole 4-1 in the interior plug 4; Second piston rod 3 is nested in the first piston bar 2; And and first piston bar 2 between form second oil pocket, second piston rod 3 also 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 oil pipe 5 stretches into second piston rod 3 are in this inner chamber all the time, second piston rod, 3 head ends and the sealing of oil pipe 5 outer walls.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification, must confirm its technical scope according to the claim scope.

Claims (1)

1. double-stage double-acting hydraulic cylinder; Include cylinder body (1), first piston bar (2) and second piston rod (3); First piston bar (2) be nested in the cylinder body (1) and and cylinder body (1) between form first oil pocket; It is characterized in that: the head end internal fixation at first piston bar (2) is provided with interior plug (4), has in the interior plug (4) and the corresponding oilhole of hydraulic fluid port (4-1) of first piston bar (2) and the oil duct (4-2) that communicates with the inner chamber of first piston bar (2), also is welded with the oil pipe (5) that communicates with oilhole (4-1) in the interior plug (4); Second piston rod (3) is nested in the first piston bar (2); And and first piston bar (2) between form second oil pocket, second piston rod (3) also 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 (5) stretches into second piston rod (3) are in this inner chamber all the time, second piston rod (3) head end and the sealing of oil pipe (5) outer wall.
CN2011103742673A 2011-11-22 2011-11-22 Double-stage double-acting hydraulic cylinder Pending CN102410279A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011103742673A CN102410279A (en) 2011-11-22 2011-11-22 Double-stage double-acting hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011103742673A CN102410279A (en) 2011-11-22 2011-11-22 Double-stage double-acting hydraulic cylinder

Publications (1)

Publication Number Publication Date
CN102410279A true CN102410279A (en) 2012-04-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011103742673A Pending CN102410279A (en) 2011-11-22 2011-11-22 Double-stage double-acting hydraulic cylinder

Country Status (1)

Country Link
CN (1) CN102410279A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103557201A (en) * 2013-11-18 2014-02-05 徐州徐工液压件有限公司 Pressure cylinder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86101725A (en) * 1986-03-20 1987-10-07 中国人民解放军第二炮兵工程设计研究所 The double-stage double-acting hydraulic jack of center oil transportation
CN201391506Y (en) * 2009-03-26 2010-01-27 济南东奥自控技术有限公司 Multilevel difunctional hydraulic cylinder
CN201606344U (en) * 2010-01-29 2010-10-13 湖南特力液压有限公司 Double-acting multistage hydraulic cylinder
CN201763721U (en) * 2010-09-16 2011-03-16 秦洪明 Double-action multi-stage hydraulic cylinder with external position and internal communication
CN202391858U (en) * 2011-11-22 2012-08-22 江苏龙城洪力液压设备有限公司 Double-stage duel-purpose hydraulic cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86101725A (en) * 1986-03-20 1987-10-07 中国人民解放军第二炮兵工程设计研究所 The double-stage double-acting hydraulic jack of center oil transportation
CN201391506Y (en) * 2009-03-26 2010-01-27 济南东奥自控技术有限公司 Multilevel difunctional hydraulic cylinder
CN201606344U (en) * 2010-01-29 2010-10-13 湖南特力液压有限公司 Double-acting multistage hydraulic cylinder
CN201763721U (en) * 2010-09-16 2011-03-16 秦洪明 Double-action multi-stage hydraulic cylinder with external position and internal communication
CN202391858U (en) * 2011-11-22 2012-08-22 江苏龙城洪力液压设备有限公司 Double-stage duel-purpose hydraulic cylinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103557201A (en) * 2013-11-18 2014-02-05 徐州徐工液压件有限公司 Pressure cylinder
CN103557201B (en) * 2013-11-18 2015-12-09 徐州徐工液压件有限公司 Pressure cylinder

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Application publication date: 20120411

C02 Deemed withdrawal of patent application after publication (patent law 2001)