CN102410278A - Multistage single-action hydraulic cylinder and engineering machinery provided with same - Google Patents
Multistage single-action hydraulic cylinder and engineering machinery provided with same Download PDFInfo
- Publication number
- CN102410278A CN102410278A CN2011103573764A CN201110357376A CN102410278A CN 102410278 A CN102410278 A CN 102410278A CN 2011103573764 A CN2011103573764 A CN 2011103573764A CN 201110357376 A CN201110357376 A CN 201110357376A CN 102410278 A CN102410278 A CN 102410278A
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- Prior art keywords
- piston
- hydraulic cylinder
- cavity
- action hydraulic
- multistage single
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention provides a multistage single-action hydraulic cylinder and engineering machinery provided with the same. According to the invention, the multistage single-action hydraulic cylinder comprises a first piston, a first piston rod, a second piston and a second piston rod, wherein the first piston is sleeved in a first piston cavity and can slide along the first piston cavity; the first piston rod is connected with the first piston and penetrates out of the first piston cavity; a second piston cavity is formed in the middle of the first piston and the first piston rod; the second piston is sleeved in the second piston cavity and can slide along the second piston cavity; the second piston rod is connected with the second piston and penetrates out of the second piston cavity; the first piston is provided with a clamping ring which covers the second piston cavity; and the clamping ring is provided with a first throttle orifice used for communicating a rodless cavity of the first piston cavity with a rodless cavity of the second piston cavity. According to the engineering machinery disclosed by the invention, the multistage single-action hydraulic cylinder is arranged. By adopting the technical scheme of the invention, constant speed of the piston rods of all stages is kept in an active throttle mode; and moreover, larger load impact can be borne.
Description
Technical field
The present invention relates to engineering machinery field, more specifically, relate to a kind of multistage single-action hydraulic cylinder and have its engineering machinery.
Background technique
At present, multistage single-action hydraulic cylinder is most of, and what adopt is telscoping hydaulic cylinder, the characteristics of the type oil hydraulic cylinder be simple in structure, cost is low.But multistage single-action hydraulic cylinder is in running, and hydraulic oil when promoting the next stage piston motion at every turn, because the variation of cylinder diameter and load, play takes place the next stage piston rod easily, causes the fluctuation of service of oil hydraulic cylinder.In order to control the movement velocity uniformity of cylinders at different levels, realize the control of cylinder speed at different levels usually by displacement transducer or other auxiliary element in the existing technology.The mode control procedure that the employing displacement transducer is controlled cylinder speed at different levels is complicated, and has improved structure complexity, assembling difficulty and the cost of multistage single-action hydraulic cylinder.In addition, in order to guarantee cylinder speed conformity not at the same level, also need with the oil hydraulic cylinder casing wall do thinner, make multistage single-action hydraulic cylinder be not suitable for the bigger operating mode of compression shock.
Summary of the invention
The present invention is intended to propose a kind of multistage single-action hydraulic cylinder, the problems referred to above that exist with the multistage single-action hydraulic cylinder that solves existing technology.
According to an aspect of the present invention, a kind of multistage single-action hydraulic cylinder is provided, has comprised: first piston is set in the first piston chamber and also can slides along the first piston chamber; The first piston bar is connected with first piston and from the first piston chamber, passes; The middle part of first piston and first piston bar forms second piston cavity; Second piston is set in second piston cavity and also can slides along second piston cavity; Second piston rod is connected with second piston and from second piston cavity, passes; First piston is provided with lid and is located at the snap ring on second piston cavity, and snap ring is provided with the first segment discharge orifice of the rodless cavity of the rodless cavity that is communicated with the first piston chamber and second piston cavity.
Further, the first segment discharge orifice is a fixed orifice, and it comprises the first hole section, tapering transition hole section and the second hole section that connects successively, and the aperture of the second hole section is less than the aperture of the first hole section, and the second hole section is connected with the rodless cavity of second piston cavity.
Further, the first segment discharge orifice is a variable orifice.
Further, snap ring and first piston are spirally connected.
Further, the first segment discharge orifice is provided with between two parties.
Further, all offer rodless cavity of its place piston cavity of connection and second throttle orifice of rod chamber on the first piston and second piston.
Further, be provided with a plurality of second throttle orifices on the first piston and second piston.
Further, multistage single-action hydraulic cylinder is the secondary single-action hydraulic cylinder, and the cylinder body of secondary single-action hydraulic cylinder forms the first piston chamber.
Further, first piston and first piston bar are one-body molded.
According to another aspect of the present invention, a kind of engineering machinery is provided also, has been provided with above-mentioned multistage single-action hydraulic cylinder.
According to technological scheme of the present invention; Be located at the snap ring on second piston cavity because of first piston is provided with lid, and snap ring is provided with the first segment discharge orifice of the rodless cavity of the rodless cavity that is communicated with the first piston chamber and second piston cavity, like this; After first piston drives the end of the first piston throw of lever; Hydraulic oil gets in the rodless cavity of second piston cavity through the first segment discharge orifice, promotes second piston motion, though second piston cavity with respect to the diameter in first piston chamber diminish, the load of second piston rod diminishes; But under the active throttling action of first segment discharge orifice; Hydraulic oil injects the rodless cavity of second piston cavity more lentamente, makes second piston drive the second piston rod constant-speed operation, thus provide a kind of simple in structure, assembling easily, cost is low and can guarantee the multistage single-action hydraulic cylinder that each piston rod travels at the uniform speed.Therefore in addition, multistage single-action hydraulic cylinder of the present invention does not need cylinder body is done thin, also is applicable to the operating mode that compression shock is bigger.
Description of drawings
The accompanying drawing that constitutes a part of the present invention is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 has schematically shown the structure of multistage single-action hydraulic cylinder of the present invention;
Fig. 2 is the local structure for amplifying of Fig. 1; And
Fig. 3 has schematically shown the structure of snap ring among the present invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
Referring to Fig. 1, show the preferred structure of a kind of multistage single-action hydraulic cylinder of the present invention.As shown in the figure, in the present embodiment, this multistage single-action hydraulic cylinder is that example describes with the two-stage single-action hydraulic cylinder.
Particularly, form first piston chamber 10 in the cylinder body 1 of single-action hydraulic cylinder, first piston (being first stage piston) 11 is set in also can 10 slips along the first piston chamber in the first piston chamber 10.First piston bar (being the first stage piston bar) 13 is connected with first piston 11 and from first piston chamber 10, passes.First piston 11 and first piston bar 13 cooperate first piston chamber 10 are divided into rodless cavity 12 and rod chamber (among the figure not label) two-part.First piston 11 forms second piston cavity 20 with first piston bar 13.Offer the pressure oil passage 16 that is communicated with rodless cavity 12 on the cylinder body 1.In first piston chamber 10, also be provided with the guide sleeve 15 of first piston bar 13.
Second piston 21 (being second piston) is set in second piston cavity 20 and can slides along second piston cavity 20.Second piston rod (being second piston rod) 23 is connected with second piston 21 and from second piston cavity 20, passes.Second piston 21 and second piston rod 23 cooperate second piston cavity 20 are divided into rodless cavity 22 and rod chamber (among the figure not label) two-part.
Working principle according to two-stage single-action hydraulic cylinder of the present invention is described below: hydraulic oil gets into rodless cavity 12 through pressure oil passage 16; And then promoting first piston 11 and 13 motions of first piston bar, this moment, second piston 21 and second piston rod 23 moved at the uniform velocity thereupon.Treat that first piston 11 moves to the setting stroke end, first piston 11 stop motions, and produce impact to cylinder body 1.Under the effect of the hydraulic oil that gets into rodless cavity 22 through first segment discharge orifice 30, second piston 21 drives second piston rod 23 along second piston cavity, 20 setting in motions.Throttling action because of first segment discharge orifice 30; Hydraulic oil injects the rodless cavity 22 of second piston cavity 20 more lentamente; Make second piston 21 drive second piston rod, 23 constant-speed operations; Play can not take place, thus provide a kind of simple in structure, assembling easily, cost is low and can guarantee the multistage single-action hydraulic cylinder that piston rods at different levels travel at the uniform speed.Therefore in addition, multistage single-action hydraulic cylinder of the present invention does not need cylinder body is done thin, also is applicable to the operating mode that compression shock is bigger.
Preferably, first segment discharge orifice 30 is a fixed orifice, and promptly the first segment discharge orifice is the throttle orifice of constant flow, and fixed orifice can be through directly processing on snap ring 3.Referring to Fig. 3; Show a kind of preferred implementation of fixed orifice; It comprises successively the first hole section 31, tapering transition hole section 32 and the second hole section 33 that connects; The aperture of the second hole section 33 is less than the aperture of the first hole section 31, and the second hole section 33 is connected with the rodless cavity 22 of second piston cavity 20, to realize initiatively restriction effect.
Preferably, first segment discharge orifice 30 is a variable orifice, and promptly first segment discharge orifice 30 is the adjustable throttle orifice of flow.Variable orifice can be realized through the Flow-rate adjustment part is installed in the fixed orifice of on snap ring 3, offering, also can realize through installation code throttle orifice spare on snap ring 3.When first segment discharge orifice 30 is variable orifice, can adapt to the different needs of different operating modes.Preferably, first segment discharge orifice 30 is provided with between two parties, so that second piston 21 is stressed even.
By it can also be seen that among the figure, preferably, all offer rodless cavity of its place piston cavity of connection and second throttle orifice 60 of rod chamber on the first piston 11 and second piston 21.60 of second throttle orifices play through-flow effect, and the oil of the rod chamber of each piston cavity can be flowed in the rodless cavity, and the back pressure of can not trying one's best effect reduces the compression shock for oil hydraulic cylinder, the protection Sealing.Preferably, be provided with a plurality of second throttle orifices 60 on the first piston 11 and second piston 21, a plurality of second throttle orifices 60 on each piston upwards evenly were provided with in week.
Need to prove; Though be the example explanation with the secondary single-action hydraulic cylinder in the present embodiment; Obviously, technological scheme of the present invention can also be applied to the above multistage single-action hydraulic cylinder of secondary, through the snap ring 3 that has first throttle hole 30 is installed on pistons at different levels; Limit to get into the mode of active throttling and close on the hydraulic fluid flow rate of grade piston cavity, realize the constant-speed operation of piston rods at different levels.
In sum, multistage single-action hydraulic cylinder utilization of the present invention closes on grade variation of piston cavity internal structure, and the mode of employing active throttling keeps the constant speed property of piston rods at different levels, has simple and reliable advantage, and shock-resistant, can bear bigger load impacting.
The present invention also provides a kind of engineering machinery, is provided with above-mentioned multistage single-action hydraulic cylinder.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. multistage single-action hydraulic cylinder comprises:
First piston (11) is set in the first piston chamber (10) and also can slides along said first piston chamber (10); First piston bar (13) is connected with said first piston (11) and from said first piston chamber (10), passes; The middle part of said first piston (11) and said first piston bar (13) forms second piston cavity (20);
Second piston (21) is set in second piston cavity (20) and also can slides along said second piston cavity (20); Second piston rod (23) is connected with said second piston (21) and from said second piston cavity (20), passes;
It is characterized in that; Said first piston (11) is provided with lid and is located at the snap ring (3) on said second piston cavity (20), and said snap ring (3) is provided with the rodless cavity (12) in connection said first piston chamber (10) and the first segment discharge orifice (30) of the rodless cavity (22) of said second piston cavity (20).
2. multistage single-action hydraulic cylinder according to claim 1; It is characterized in that; Said first segment discharge orifice (30) is a fixed orifice; It comprises the first hole section (31), tapering transition hole section (32) and the second hole section (33) that connects successively, and the aperture of the said second hole section (33) is less than the aperture of the said first hole section (31), and the said second hole section (33) is connected with the rodless cavity (22) of said second piston cavity (20).
3. multistage single-action hydraulic cylinder according to claim 1 is characterized in that, said first segment discharge orifice (30) is a variable orifice.
4. multistage single-action hydraulic cylinder according to claim 1 is characterized in that, said snap ring (3) is spirally connected with said first piston (11).
5. according to each described multistage single-action hydraulic cylinder in the claim 1 to 4, it is characterized in that said first segment discharge orifice (30) is placed in the middle to be provided with.
6. according to each described multistage single-action hydraulic cylinder in the claim 1 to 4, it is characterized in that, all offer the rodless cavity of its place piston cavity of connection and second throttle orifice (60) of rod chamber on said first piston (11) and said second piston (21).
7. multistage single-action hydraulic cylinder according to claim 6 is characterized in that, is provided with a plurality of said second throttle orifices (60) on said first piston (11) and said second piston (21).
8. multistage single-action hydraulic cylinder according to claim 1 is characterized in that, said multistage single-action hydraulic cylinder is the secondary single-action hydraulic cylinder, and the cylinder body of said secondary single-action hydraulic cylinder (1) forms said first piston chamber (10).
9. multistage single-action hydraulic cylinder according to claim 8 is characterized in that, said first piston (11) and said first piston bar (13) are one-body molded.
10. an engineering machinery is characterized in that, is provided with each described multistage single-action hydraulic cylinder in the claim 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103573764A CN102410278A (en) | 2011-11-11 | 2011-11-11 | Multistage single-action hydraulic cylinder and engineering machinery provided with same |
| PCT/CN2012/073904 WO2013067799A1 (en) | 2011-11-11 | 2012-04-12 | Multi-stage and single-action hydraulic cylinder and engineering machinery having same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103573764A CN102410278A (en) | 2011-11-11 | 2011-11-11 | Multistage single-action hydraulic cylinder and engineering machinery provided with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102410278A true CN102410278A (en) | 2012-04-11 |
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ID=45912537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103573764A Pending CN102410278A (en) | 2011-11-11 | 2011-11-11 | Multistage single-action hydraulic cylinder and engineering machinery provided with same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102410278A (en) |
| WO (1) | WO2013067799A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927081A (en) * | 2012-12-07 | 2013-02-13 | 向光 | Overhead-charged four-grade cylinder of passenger car |
| CN102996570A (en) * | 2012-11-28 | 2013-03-27 | 三一重工股份有限公司 | Single-action double-graded hydraulic cylinder and engineering machine |
| WO2013067799A1 (en) * | 2011-11-11 | 2013-05-16 | 湖南三一智能控制设备有限公司 | Multi-stage and single-action hydraulic cylinder and engineering machinery having same |
| 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 |
| CN106041717A (en) * | 2016-07-19 | 2016-10-26 | 苏州赫瑞特电子专用设备科技有限公司 | Hydraulic lifting mechanism of grinding machine or polishing machine |
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| WO2016064356A1 (en) * | 2014-10-20 | 2016-04-28 | Gali̇poğlu Hi̇dromas Hi̇droli̇k Otomoti̇v Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | A telescopic cylinder with a plurality of inner pistons |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013067799A1 (en) * | 2011-11-11 | 2013-05-16 | 湖南三一智能控制设备有限公司 | Multi-stage and single-action hydraulic cylinder and engineering machinery having same |
| CN102996570A (en) * | 2012-11-28 | 2013-03-27 | 三一重工股份有限公司 | Single-action double-graded hydraulic cylinder and engineering machine |
| CN102996570B (en) * | 2012-11-28 | 2015-04-22 | 三一重工股份有限公司 | Single-action double-graded hydraulic cylinder and engineering machine |
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| 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 |
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| CN106041717A (en) * | 2016-07-19 | 2016-10-26 | 苏州赫瑞特电子专用设备科技有限公司 | Hydraulic lifting mechanism of grinding machine or polishing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013067799A1 (en) | 2013-05-16 |
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Application publication date: 20120411 |
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| RJ01 | Rejection of invention patent application after publication |