CN2606817Y - Two-stage hydraulic cylinder - Google Patents
Two-stage hydraulic cylinder Download PDFInfo
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- CN2606817Y CN2606817Y CN 03239661 CN03239661U CN2606817Y CN 2606817 Y CN2606817 Y CN 2606817Y CN 03239661 CN03239661 CN 03239661 CN 03239661 U CN03239661 U CN 03239661U CN 2606817 Y CN2606817 Y CN 2606817Y
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Abstract
A two-stage hydraulic cylinder comprises a hydraulic cylinder second-stage piston. The first-stage piston rod of the hydraulic cylinder is a through hollow tube on which a first-stage piston is arranged, and the second-stage piston is encased in the first-stage piston rod, wherein, the lower end of the first-stage piston rod is provided with a positioning plate; at least one through hole is arranged on the positioning plate; a hollow holding cavity is arranged in a second-stage piston rod, in which at least one reset spring is arranged; one end of the reset spring is connected with the top of the second-stage piston rod, while the other end is connected to the above positioning plate. The utility model overcomes the disadvantages of the prior art, can ensure that the no-load positioning process is first lifted by the first-stage piston rod and then lifted by the second-stage piston rod by means of the above structure, and the second-stage piston is made to automatically reset through the spring, which is beautiful in structure.
Description
Technical field
The utility model relates to a kind of oil hydraulic cylinder, especially refer to a kind of second level oil cylinder only rodless cavity have a hydraulic fluid port, and can guarantee that zero load puts process in place by the at first lifting of first order piston by Returnning spring, the order of lifting behind the piston of the second level, and second level piston can automatically reset double-stage hydraulic cylinder.
Background technique
Twin-stage or multistage hydraulic cylinder comprise two kinds of double action and single-acting formulas, and it is to be formed by two or more piston suits, and the piston rod of previous stage piston cylinder is as the cylinder barrel of back first stage piston cylinder.Can obtain long working stroke when stretching out, can keep very little physical dimension during withdrawal, therefore be widely used in the top and lift on the work tool.
But existing double action double-stage hydraulic cylinder, resetting of its second level piston adopts hydraulic pressure to reset, therefore need hydraulic fluid port to be set in the upper end portion of first order piston rod wall (being second level piston bore), so that hydraulic oil enters in the piston bore of the second level by this hydraulic fluid port, guarantee automatically reseting of second level piston.Generally speaking, if will on cylinder wall, punch 5mm, then need be greater than the oil cylinder wall thickness of 10mm, to guarantee the intensity of oil hydraulic cylinder.Therefore under the constant situation of oil hydraulic cylinder overall volume, increased the wall thickness of first order piston (being second level piston bore) virtually, but reduced the useful area of second level piston, thereby weakened the lifting force of second level piston rod.In addition, hydraulic fluid port is set, then needs external oil pipe guaranteeing normal fuel injection in the upper end wall of first order piston rod, owing to increased the setting of oil pipe, thus make liquid cylinder entity not attractive in appearance, and reduced effective working stroke, strengthened the physical dimension of oil hydraulic cylinder.
Another kind of known single-acting formula double-stage hydraulic cylinder, though avoided hydraulic fluid port being set, but it does not have automatically reset function, when the piston rod retraction is finished in work in the upper end wall of first order piston rod, second piston can only reset by manually making it, and is very inconvenient in actual use.
The design people is that the design research and development are improved in view of the defective that above-mentioned known configurations exists then, has passed through after the research with great concentration, has overcome above-mentioned defective finally, has finished the utility model.
Summary of the invention
The technical problems to be solved in the utility model is: a kind of double-stage hydraulic cylinder is provided, especially a kind ofly only on the positioning plate of first order piston base setting, be provided with through hole, so that the lifting force of second level piston to be provided, and Returnning spring is set on second piston rod, guarantee that zero load puts process in place by the at first lifting of first order piston rod, the order of lifting behind the piston rod of the second level can make second level piston automatically reset by spring simultaneously, the double-stage hydraulic cylinder that structure is attractive in appearance.
The technical solution of the utility model is: a kind of double-stage hydraulic cylinder, have hydraulic cylinder and second piston, the first order piston rod of described oil hydraulic cylinder is a hollow cylinder that connects, which is provided with first order piston, second level piston sleeve is located in the first order piston rod, wherein, the lower end of described first order piston rod is provided with a positioning plate, this positioning plate is provided with at least one through hole, be provided with a hollow holding cavity in the piston rod of the described second level, be provided with at least one Returnning spring in it, an end of described Returnning spring is connected with the top of second level piston rod, and the other end is connected in above-mentioned positioning plate.
Aforesaid double-stage hydraulic cylinder, the sheathed first order piston rod that is fixed in of described first order piston, this positioning plate and first order piston rod are for removably fixedlying connected.
Aforesaid double-stage hydraulic cylinder, described first order piston is fixed in the lower end of first order piston rod, and described middle of piston is provided with one or more than one through hole, and above-mentioned positioning plate and this first order piston are wholely set.
Aforesaid double-stage hydraulic cylinder, can fixedly connected with the top and the positioning plate of second level piston respectively in the two ends of described Returnning spring.
Aforesaid double-stage hydraulic cylinder, the two ends of described Returnning spring can be respectively established with the top of second level piston and location plate hook and are fixedlyed connected.
Aforesaid double-stage hydraulic cylinder is sealing setting between described first order piston and piston rod and cylinder barrel.
Aforesaid double-stage hydraulic cylinder is provided with seal arrangement between described second level piston and cylinder barrel.
Characteristics of the present utility model and advantage are:
1, the double-stage hydraulic cylinder that the utility model proposes, owing to only be provided with the positioning plate of at least one through hole of tool in first order piston (bar) bottom, this through hole filler opening during simultaneously as second level piston lifting and the return opening during retraction, between the positioning plate of first order piston base and second level piston rod part, fixedly install Returnning spring, this second level piston can be automatically reset under the effect of Returnning spring.
2, owing to do not need the turnover oilhole to be set in first order piston rod upper end wall, still can guarantee that second level piston automatically resets by spring, therefore can be under the situation that does not add the large tank integral diameter, reduce the wall thickness of first order piston rod relatively, thereby it is poor to have reduced two inter-stage cylinder diameters, under the prerequisite that guarantees cylinder barrel intensity, improves the useful area of second level piston, with compare with the diameter double-stage double-acting hydraulic cylinder, improved the thrust of second level piston rod.
3, Returnning spring is arranged between the top of the positioning plate of first order piston base and second level piston rod, after hydraulic oil enters oil cylinder, because the pulling force of Returnning spring has been guaranteed in zero load puts process in place, the at first lifting of first order piston rod, the order of lifting behind the piston rod of the second level.
4, in addition, owing to do not need hydraulic fluid port to be set, therefore removed the external oil pipe of second level oil cylinder that is provided with in the known technology, thereby improved the overall aesthetics of oil hydraulic cylinder at the rod chamber of second level oil cylinder.
Description of drawings
Fig. 1 is the assembled state schematic representation of the utility model double-stage hydraulic cylinder;
Fig. 2,3 is the movement process schematic representation of the utility model double-stage hydraulic cylinder;
Fig. 4 is another embodiment's schematic representation that the utility model double-stage hydraulic cylinder first order piston is connected with piston rod.
Embodiment
Now conjunction with figs. and specific embodiment are described in further detail the technical solution of the utility model.
As Figure 1-3, double-stage hydraulic cylinder of the present utility model, have hydraulic cylinder 1 and second piston, the first order piston rod 2 of described oil hydraulic cylinder is a hollow cylinder that connects, and this cylindrical shell upper end inner edge surface is provided with a ring flange 24, and its underpart connects first order piston 23, one positioning plate 21 is arranged on the bottom of this first order piston rod 2, this positioning plate 21 and first order piston rod also can be to fix with screw thread and this piston rod, or be connected in other known mode for removably being embedded.This positioning plate 21 is provided with at least one through hole 22, also can at this positioning plate 21 plurality of through holes be set as required, constitutes a location sieve plate.Second level piston rod 3 is sheathed in the hollow cylinder of first order piston rod 2, be provided with a hollow holding cavity in this second level piston rod 3, be provided with at least one Returnning spring 5 in it, the roof anchorage of one end of this Returnning spring 5 and 3 sealings of second level piston rod, the positioning plate 21 of the other end and first order piston rod 2 bottoms is fixing, the external stability second level piston 31 of described second level piston rod 3, for best, this oil hydraulic cylinder had range when this second level piston 31 was fixed on the bottom of second level piston rod 3.Above-mentioned flange 24 constitutes the positive stops of second level piston 3.
Shown in the figure, first and second grade piston 23,31 is with piston rod 2,3 and is wholely set, and is positioned at the bottom of piston rod, and this piston 23,31 can also other known structure be connected with piston rod 2,3 certainly, be fixed on the piston rod as socket, or be fixed on the lower end of piston rod.When this piston is fixed on the lower end of piston rod, through hole should be set on piston, can be with assurance to second level piston rod fuel feeding.When above-mentioned piston is fixed near piston-rod lower end portion, can obtain the maximum functional stroke of oil hydraulic cylinder.
Above-mentioned positioning plate 21 also can with first order piston for being wholely set, when first order piston 23 ' is fixedlyed connected (or removably fixedly connected) with the lower end of first order piston rod, its middle part can be provided with one, or more than one through hole, positioning plate shown in the pie graph 1 21 is wholely set with this first order piston rod, as shown in Figure 4.
Described through hole 22 is when oil hydraulic cylinder is done the lifting operation, as the filler opening of second piston 31; And when the decline of second piston resets, as its return opening.Because the existence of this Returnning spring 5 has guaranteed that zero load puts process in place by at first lifting of first order piston rod 2, the order of second level piston rod 3 back liftings; And when piston decline return, second level piston 31 is automatically reset.
Working principle of the present utility model is: this double-stage hydraulic cylinder, by a positioning plate 21 is set in first order piston base, second level piston rod 3 has a hollow holding cavity, the Returnning spring 5 that one end is connected with positioning plate 21, the other end is connected with second level piston rod 3 tops is set in it, thereby the rod chamber that makes this second level oil hydraulic cylinder is under the situation that no hydraulic oil enters, and second level piston rod 3 can be realized automatically reseting.
In the present embodiment, in the lifting process of oil hydraulic cylinder, but the flange 11 that described first order piston 23 blocks are provided with in hydraulic cylinder 1 upper end, but described second level piston 31 blocks in the flange 24 of first order piston rod 2 cylindrical shells upper end inner edge surface, thereby limit the stroke of first and second grade piston.
Be provided with seal arrangement 41 between first order piston 23 and the hydraulic cylinder 1, be provided with seal arrangement 42 between the fitting surface of the hollow cylinder of second level piston 31 and first order piston rod 2, also be provided with seal arrangement 43 in addition between the fitting surface of hydraulic cylinder 1 top and first order piston rod 2, described seal arrangement 42 can be seal ring or other known sealing configuration.When hydraulic cylinder works, can prevent oil liquid leakage.
Working procedure of the present utility model is, hydraulic oil enters oil hydraulic cylinder from oil pipe through hydraulic fluid port A, at first contact, push up the positioning plate 21 of lifting first order piston rod 2 bottoms, and enter in the second level piston rod 3 by through hole 22 simultaneously, with 23 liftings of first order piston, the hydraulic oil mat in the first order piston bore is through hydraulic fluid port 6 oil returns.Owing to be provided with under the effect of Returnning spring 5 at second level piston, these second level piston 3 bars are with 2 liftings of first order piston rod.When first order piston 23 blocks behind the flange 11 of hydraulic cylinder 1, whole pressure of hydraulic oil all act on second level piston 31, thereby overcome the pulling force of Returnning spring 5, piston rod 3 liftings in the second level are put in place, or the range of lifting to the top, piston 31 blocks become a working stroke fully in the flange 24 of first order piston rod 2.Therefore the setting of described Returnning spring 5 has guaranteed that zero load puts process in place by at first lifting of first order piston rod 2, the order of second level piston rod 3 back liftings.
After fulfiling assignment, the reverse fuel feeding of oil hydraulic circuit, be that hydraulic oil enters in the first order piston bore 1 by above-mentioned hydraulic fluid port 6, and through above-mentioned hydraulic fluid port A oil return, then the hydraulic oil in the second level piston rod 3 is by through hole 22 (be the return opening of second piston this moment), hydraulic fluid port A oil return, under the effect of described Returnning spring 5, second level piston 31 automatically resets.Simultaneously, under the effect of hydraulic oil, first order piston 23 descends and resets, and so far a working stroke finishes.
The double-stage hydraulic cylinder that the utility model proposes has overcome the shortcoming of known technology, owing to do not need still can guarantee that second level piston 31 automatically resets by spring 5 at first order piston upper end wall punching turnover oil, therefore can be under the situation that does not add the large tank integral diameter, reduce the wall thickness of first order piston rod 2 relatively, thereby it is poor to have reduced two inter-stage cylinder diameters, under the prerequisite that guarantees cylinder barrel intensity, improve the useful area of second level piston, with compare with the diameter double-stage double-acting hydraulic cylinder, improved the thrust of second piston, and removed the external oil pipe of second level oil cylinder that is provided with in the known technology, improved the overall aesthetics of oil hydraulic cylinder.Above-mentioned Returnning spring 5 is arranged between the holding cavity top of the positioning plate 21 of first order piston 23 bottoms and second level piston rod 3, after hydraulic oil enters oil cylinder, because the pulling force of Returnning spring 5, guaranteed in zero load puts process in place, at first lifting of first order piston rod 2, the order of second level piston rod 3 back liftings makes this oil hydraulic cylinder action accurately, has good force-bearing situation.
The above person only; only be specific embodiment of the utility model, when can not with the scope implemented of qualification the utility model, so the displacement of its equivalent assemblies; or, all should still belong to the category that this patent is contained according to equivalent variations and modification that the utility model scope of patent protection is done.
Claims (7)
1, a kind of double-stage hydraulic cylinder, have hydraulic cylinder and second piston, the first order piston rod of described oil hydraulic cylinder is a hollow cylinder that connects, which is provided with first order piston, second level piston sleeve is located in the first order piston rod, it is characterized in that: the lower end of described first order piston rod is provided with a positioning plate, this positioning plate is provided with at least one through hole, be provided with a hollow holding cavity in the piston rod of the described second level, be provided with at least one Returnning spring in it, one end of described Returnning spring is connected with the top of second level piston rod, and the other end is connected in above-mentioned positioning plate.
2, double-stage hydraulic cylinder as claimed in claim 1 is characterized in that: the sheathed first order piston rod that is fixed in of described first order piston, this positioning plate and first order piston rod are for removably fixedlying connected.
3, double-stage hydraulic cylinder as claimed in claim 1, it is characterized in that: described first order piston is fixed in the lower end of first order piston rod, and described middle of piston is provided with one or more than one through hole, and above-mentioned positioning plate and this first order piston are wholely set.
4, as each described double-stage hydraulic cylinder of claim 1 to 3, it is characterized in that: can fixedly connected with the top and the positioning plate of second level piston respectively in the two ends of described Returnning spring.
5, as each described double-stage hydraulic cylinder of claim 1 to 3, it is characterized in that: the two ends of described Returnning spring can be respectively established with the top of second level piston and location plate hook and are fixedlyed connected.
6, double-stage hydraulic cylinder as claimed in claim 1 is characterized in that: be sealing setting between first order piston and piston rod and cylinder barrel.
7, double-stage hydraulic cylinder as claimed in claim 1 is characterized in that: be provided with seal arrangement between described second level piston and cylinder barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03239661 CN2606817Y (en) | 2003-03-03 | 2003-03-03 | Two-stage hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03239661 CN2606817Y (en) | 2003-03-03 | 2003-03-03 | Two-stage hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2606817Y true CN2606817Y (en) | 2004-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03239661 Expired - Fee Related CN2606817Y (en) | 2003-03-03 | 2003-03-03 | Two-stage hydraulic cylinder |
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| Country | Link |
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| CN (1) | CN2606817Y (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858204A (en) * | 2010-06-17 | 2010-10-13 | 牡丹江东旭机械有限责任公司 | Blowout preventer turning system |
| CN102889267A (en) * | 2012-11-16 | 2013-01-23 | 江阴市洪腾机械有限公司 | Self-restoration single-action type hydraulic cylinder |
| CN104405722A (en) * | 2014-11-05 | 2015-03-11 | 镁联科技（芜湖）有限公司 | Telescopic cylinder |
| CN104948530A (en) * | 2015-06-17 | 2015-09-30 | 蚌埠市行星工程机械有限公司 | Single-action spring oil cylinder |
| CN105003486A (en) * | 2015-07-24 | 2015-10-28 | 芜湖市银鸿液压件有限公司 | Composite bidirectional hydraulic lifting dam and use method thereof |
| CN105065368A (en) * | 2015-07-24 | 2015-11-18 | 芜湖市银鸿液压件有限公司 | Combined type bidirectional hydraulic hoisting dam and use method thereof |
| CN105114393A (en) * | 2015-07-24 | 2015-12-02 | 芜湖市银鸿液压件有限公司 | Compound two-way oil cylinder of hydraulic lifting dam, and using method of compound two-way oil cylinder |
| CN105313278A (en) * | 2015-09-29 | 2016-02-10 | 苏州优耐鑫模具科技有限公司 | Novel stacked type injection mold |
| CN106762951A (en) * | 2016-12-28 | 2017-05-31 | 王金达 | A kind of compressed air backhaul single-action hydraulic cylinder |
| CN107654443A (en) * | 2017-08-28 | 2018-02-02 | 无锡瑞真精机股份有限公司 | Telescopic hydraulic makes concentric mechanism by oneself |
| CN107738969A (en) * | 2016-11-25 | 2018-02-27 | 重庆键英液压机电有限公司 | Hydraulic Power Transmission System based on multistage hydraulic cylinder |
| CN107738967A (en) * | 2016-11-25 | 2018-02-27 | 重庆键英液压机电有限公司 | Lowering or hoisting gear and its control method based on multistage hydraulic cylinder |
| CN107807171A (en) * | 2017-10-26 | 2018-03-16 | 西南石油大学 | A kind of testing agency of in-service Large Oil Tank Corrosion monitoring robot |
| CN108591210A (en) * | 2018-05-09 | 2018-09-28 | 嵊州市恒中机器有限公司 | Supporting post-rod device |
| CN109899339A (en) * | 2019-02-22 | 2019-06-18 | 中船重工中南装备有限责任公司 | Additional oil circuit Double Acting Telescopic Hydraulic Cylinder built in one kind |
| CN112548951A (en) * | 2019-09-10 | 2021-03-26 | 欣展晟股份有限公司 | Hydraulic reset tool for piston of disc brake cylinder |
-
2003
- 2003-03-03 CN CN 03239661 patent/CN2606817Y/en not_active Expired - Fee Related
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858204A (en) * | 2010-06-17 | 2010-10-13 | 牡丹江东旭机械有限责任公司 | Blowout preventer turning system |
| CN102889267A (en) * | 2012-11-16 | 2013-01-23 | 江阴市洪腾机械有限公司 | Self-restoration single-action type hydraulic cylinder |
| CN104405722A (en) * | 2014-11-05 | 2015-03-11 | 镁联科技（芜湖）有限公司 | Telescopic cylinder |
| CN104948530A (en) * | 2015-06-17 | 2015-09-30 | 蚌埠市行星工程机械有限公司 | Single-action spring oil cylinder |
| CN105003486A (en) * | 2015-07-24 | 2015-10-28 | 芜湖市银鸿液压件有限公司 | Composite bidirectional hydraulic lifting dam and use method thereof |
| CN105065368A (en) * | 2015-07-24 | 2015-11-18 | 芜湖市银鸿液压件有限公司 | Combined type bidirectional hydraulic hoisting dam and use method thereof |
| CN105114393A (en) * | 2015-07-24 | 2015-12-02 | 芜湖市银鸿液压件有限公司 | Compound two-way oil cylinder of hydraulic lifting dam, and using method of compound two-way oil cylinder |
| CN105313278A (en) * | 2015-09-29 | 2016-02-10 | 苏州优耐鑫模具科技有限公司 | Novel stacked type injection mold |
| CN105313278B (en) * | 2015-09-29 | 2017-07-18 | 苏州优耐鑫模具科技有限公司 | Laminated type injection-molding mold |
| CN107738967A (en) * | 2016-11-25 | 2018-02-27 | 重庆键英液压机电有限公司 | Lowering or hoisting gear and its control method based on multistage hydraulic cylinder |
| CN107738969A (en) * | 2016-11-25 | 2018-02-27 | 重庆键英液压机电有限公司 | Hydraulic Power Transmission System based on multistage hydraulic cylinder |
| CN106762951A (en) * | 2016-12-28 | 2017-05-31 | 王金达 | A kind of compressed air backhaul single-action hydraulic cylinder |
| CN107654443A (en) * | 2017-08-28 | 2018-02-02 | 无锡瑞真精机股份有限公司 | Telescopic hydraulic makes concentric mechanism by oneself |
| CN107654443B (en) * | 2017-08-28 | 2024-02-06 | 无锡瑞真精机股份有限公司 | Telescopic hydraulic self-centering mechanism |
| CN107807171A (en) * | 2017-10-26 | 2018-03-16 | 西南石油大学 | A kind of testing agency of in-service Large Oil Tank Corrosion monitoring robot |
| CN108591210A (en) * | 2018-05-09 | 2018-09-28 | 嵊州市恒中机器有限公司 | Supporting post-rod device |
| CN108591210B (en) * | 2018-05-09 | 2020-03-24 | 嵊州市恒中机器有限公司 | Support ejector rod device |
| CN109899339A (en) * | 2019-02-22 | 2019-06-18 | 中船重工中南装备有限责任公司 | Additional oil circuit Double Acting Telescopic Hydraulic Cylinder built in one kind |
| CN109899339B (en) * | 2019-02-22 | 2024-01-02 | 中船重工中南装备有限责任公司 | Double-acting multistage hydraulic cylinder with built-in additional oil way |
| CN112548951A (en) * | 2019-09-10 | 2021-03-26 | 欣展晟股份有限公司 | Hydraulic reset tool for piston of disc brake cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |