CN106640834B - Hydraulic cylinder, hydraulic system and crane - Google Patents
Hydraulic cylinder, hydraulic system and crane Download PDFInfo
- Publication number
- CN106640834B CN106640834B CN201611250872.9A CN201611250872A CN106640834B CN 106640834 B CN106640834 B CN 106640834B CN 201611250872 A CN201611250872 A CN 201611250872A CN 106640834 B CN106640834 B CN 106640834B
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- cavity
- cylinder
- piston
- hydraulic
- hydraulic fluid
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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
- F15B15/1423—Component parts; Constructional details
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
Abstract
The present invention relates to hydraulic cylinder, hydraulic system and cranes.Hydraulic cylinder includes：Cylinder；First piston, is arranged in cylinder and can be along the axial movement of cylinder；Piston rod, one end is connected on first piston and along the axially extending of cylinder, cylinder has the first cavity positioned at the side back to piston rod of first piston, first cavity can introduce and be discharged hydraulic fluid, piston rod has the second axially extending cavity along cylinder, hydraulic cylinder further includes the second piston that can be moved along the second cavity, second piston is fixed relative to cylinder, second cavity includes the accommodating chamber towards first piston side positioned at second piston, when the first cavity introduces hydraulic fluid, hydraulic fluid can be discharged in accommodating chamber, when hydraulic fluid is discharged in the first cavity, accommodating chamber can introduce hydraulic fluid.The technical solution of the application improves the big problem of variable quantity of the hydraulic fluid in hydraulic cylinder during piston rod existing in the prior art movement.
Description
Technical field
The present invention relates to engineering equipment fields, in particular to a kind of hydraulic cylinder, hydraulic system and crane.
Background technology
Fig. 1 shows the structural schematic diagram of the hydraulic cylinder of the prior art.It is shown in Figure 1, hydraulic cylinder packet cylinder 1 ', setting
In the cylinder 1 ' and can along the axial movement of cylinder 1 ' piston 2 ' be connected to 2 ' upper piston rod 3 ' of piston.Cylinder 1 ' has
The first cavity 4 ' positioned at the side back to piston rod 3 ' of piston 2 ' and the side towards piston rod 3 ' positioned at piston 2 '
Second cavity 5 '.First cavity 4 ' and the second cavity 5 ' can introduce and be discharged hydraulic fluid.
In the prior art, hydraulic system includes hydraulic cylinder, the babinet for accommodating hydraulic fluid and for in babinet
The pump of hydraulic fluid pressurization.First cavity 4 ' and the second cavity 5 ' can be connected to pump, the first cavity 4 ' and the second cavity 5 '
Also it can be connected to babinet.
When the first cavity 4 ' be connected to pump to introduce the hydraulic fluid after pump pressurization, the second cavity 5 ' is by the liquid inside it
Pressure fluid is arranged to babinet, and piston rod 3 ' is stretched out to cylinder 1 ' is external；After the second cavity 5 ' is connected to pump to introduce pump pressurization
When hydraulic fluid, the first cavity 4 ' arranges its internal hydraulic fluid to babinet, and piston rod 3 ' bounces back to cylinder 1 ' is internal.
As described in Figure 1, the internal diameter of the first cavity 4 ' and the internal diameter of cylinder 1 ' are D, the first cavity 4 ' perpendicular to cylinder
The area S in 1 ' axial section1=π D2/ 4, piston 2 ' is during the axial movement unit distance l of cylinder 1 ', the first chamber
Body 4 ' introduces or the volume v of the hydraulic fluid of discharge1=l S1=l π D2/4。
The outer diameter of piston rod 3 ' is d, the area S perpendicular to the section of cylinder 1 ' of the second cavity 5 '2=π (D2-d2)/4,
Piston 2 ' is during the axial movement unit distance l of cylinder 1 ', and the second cavity 5 ' introduces or the body of the hydraulic fluid of discharge
Product v2=l S2=l π (D2-d2)/4.Preferably, piston rod 3 ' is tubulose, and the internal diameter of piston rod 3 ' is d1。
During axial movement unit distance l of the piston 3 ' along cylinder 1 ', hydraulic fluid in hydraulic cylinder is (comprising the
The hydraulic fluid in hydraulic fluid and the second cavity 5 ' in one cavity 4 ') variable quantity v3=v1-v2=l π d2/4。
Piston 2 ' is L along the maximum distance of the axial movement of cylinder 1 '.When 3 ' displacement distance L of piston rod, stream in hydraulic cylinder
The variable quantity V of body3=v3L=L π d2/ 4, the amount of the hydraulic fluid increased or decreased in corresponding babinet is equal to V3, therefore babinet
Minimum volume be V3。
Therefore, the outer diameter of piston rod 3 ' is bigger, during piston 3 ' is mobile in cylinder 1 ', the flow of pressurized in hydraulic cylinder
The variable quantity of body is bigger, and corresponding hydraulic cylinder needs the volume for the babinet being equipped with also bigger.
With the increase that various engineering equipments need the driving capability of hydraulic cylinder, the size of hydraulic cylinder constantly increases, phase
The outside diameter d of the piston rod 3 ' for the hydraulic cylinder answered is also required to increase, it is therefore desirable to for hydraulic cylinder be equipped with bigger babinet to accommodate
Hydraulic fluid.
Invention content
The present invention is intended to provide a kind of hydraulic cylinder, hydraulic system and crane, to improve piston existing in the prior art
The big problem of the variable quantity of hydraulic fluid in mobile process in hydraulic cylinder.
One side according to the ... of the embodiment of the present invention, the present invention provides a kind of hydraulic cylinders, including：
Cylinder；
First piston, is arranged in cylinder and can be along the axial movement of cylinder；
Piston rod, one end are connected on first piston and along the axially extending of cylinder,
There is cylinder the first cavity positioned at the side back to piston rod of first piston, the first cavity can introduce and arrange
Go out hydraulic fluid,
Piston rod has the second axially extending cavity along cylinder, and hydraulic cylinder further includes that can be moved along the second cavity
Second piston, second piston are fixed relative to cylinder, and the second cavity includes positioned at second piston towards first piston side
Accommodating chamber, when the first cavity introduces hydraulic fluid, hydraulic fluid can be discharged in accommodating chamber, and hydraulic fluid is discharged in the first cavity
When, accommodating chamber can introduce hydraulic fluid.
Optionally, further include making second piston relative to the fixed connecting component of cylinder, connecting component connects with second piston
It connects and extends to first piston, be provided with the first through hole for allowing connecting component to pass through on first piston, connecting component passes through the
One through-hole is simultaneously connect with the cavity wall of the first cavity.
Optionally, connecting component includes tube-like piece, and one end of the close second piston of tube-like piece is connected to accommodating chamber, tubulose
One end of the separate second piston of part is for the hydraulic fluid to accommodating chamber input hydraulic pressure fluid and for being discharged in accommodating chamber.
Optionally, the first passage for being connected to accommodating chamber and tube-like piece is provided in second piston.
Optionally, the first hole being connected to the second end of tube-like piece is provided in the cavity wall of the first cavity, the first hole is used for
Hydraulic fluid to accommodating chamber input hydraulic pressure fluid and for being discharged in accommodating chamber.
Optionally, cylinder has the third cavity being formed between First piston bar and cylinder, third cavity and pipe
The second end of shape part is connected to, and third cavity can introduce and be discharged hydraulic fluid, and hydraulic fluid is introduced to push in third cavity
When piston rod bounces back to the inside of cylinder, fluid is discharged in the first cavity, and hydraulic fluid is introduced to push piston rod in the first cavity
When being stretched out to the outside of cylinder, hydraulic fluid is discharged in third cavity.
Optionally, there is cylinder the third cavity being formed between piston rod and cylinder, third cavity can introduce and arrange
Go out hydraulic fluid, when third cavity introduces hydraulic fluid to push piston rod to bounce back to the inside of cylinder, the discharge of the first cavity
Fluid, when introducing hydraulic fluid in the first cavity to push piston rod to be stretched out to the outside of cylinder, flow of pressurized is discharged in third cavity
Body.
Optionally, third cavity is connected to accommodating chamber.
Optionally, the second hole for being connected to third cavity and accommodating chamber is provided on piston rod.
Optionally, the second channel for being connected to accommodating chamber and third cavity is provided on first piston.
Optionally, accommodating chamber is connected to the first cavity.
Optionally, the second through-hole for being connected to the first cavity and accommodating chamber is provided on first piston.
Other side according to the ... of the embodiment of the present invention, present invention also provides a kind of hydraulic system, hydraulic system includes：
Above-mentioned hydraulic cylinder；
Babinet, the hydraulic fluid for accommodating accommodating chamber and/or the discharge of the first cavity；
Pump, for pressurizeing for the hydraulic fluid in babinet and can the hydraulic fluid after pressurization be delivered to the first cavity
To push first piston to move.
Optionally, hydraulic system has the first working condition and the second working condition,
In the first working condition, the first cavity is connected to pump to introduce the hydraulic fluid after pump pressurization, accommodating chamber and babinet
Connection is arranging the hydraulic fluid in accommodating chamber to babinet；
In the second working condition, the first cavity is connected to babinet arranging the hydraulic fluid in the first cavity to babinet, is held
Chamber of receiving is connected to pump to introduce the hydraulic fluid after pump pressurization.
Another aspect according to the ... of the embodiment of the present invention, present invention also provides a kind of cranes, optionally, including it is above-mentioned
Hydraulic system.
Optionally, further include arm, hydraulic cylinder is for driving arm to rotate.
Using the technical solution of the application, piston rod has the accommodating chamber that can accommodate hydraulic fluid.Draw in the first cavity
When entering hydraulic fluid to push piston rod to be stretched out to the outside of cylinder, hydraulic fluid can be discharged in accommodating chamber, the liquid in hydraulic cylinder
The pressure increased amount of fluid reduces the amount of the hydraulic fluid of accommodating chamber discharge compared with the existing technology.
When piston rod bounces back to the inside of cylinder so that hydraulic fluid is discharged in the first cavity, accommodating chamber can introduce hydraulic pressure
Fluid, the amount that hydraulic fluid reduces in hydraulic cylinder reduce the amount of the introduced hydraulic fluid of accommodating chamber compared with the existing technology.
Therefore, the hydraulic cylinder of the present embodiment improves during piston rod existing in the prior art moves in hydraulic cylinder
Hydraulic fluid the big problem of variable quantity.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 shows the structural schematic diagram of the hydraulic cylinder of the prior art；
Fig. 2 shows the structural schematic diagrams of the hydraulic cylinder of the first embodiment of the present invention；
Fig. 3 shows the structural schematic diagram of the hydraulic system of the first embodiment of the present invention；
Fig. 4 shows the structural schematic diagram of the hydraulic cylinder of the second embodiment of the present invention；
Fig. 5 shows the structural schematic diagram of another preferred embodiment of the hydraulic cylinder of the second embodiment of the present invention；
Fig. 6 shows the structural schematic diagram of another preferred embodiment of the hydraulic cylinder of the second embodiment of the present invention；
Fig. 7 shows the structural schematic diagram of the hydraulic cylinder of the third embodiment of the present invention；And
Fig. 8 shows the structural schematic diagram of another preferred embodiment of the hydraulic cylinder of the third embodiment of the present invention.
In figure：1 ', cylinder；2 ', piston；3 ', piston rod；4 ', first cavity；5 ', second cavity；1, cylinder；2, first
Piston；3, piston rod；4, accommodating chamber；5, the first cavity；6, the second cavity；7, second piston；8, connecting component；9, third chamber
Body；10, first passage；11, the first hole；12, the second through-hole；13, second channel；14, pipeline；15, the second through-hole；30, hydraulic pressure
Cylinder；40, babinet；50, it pumps；60, reversal valve.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Embodiment one：
Fig. 2 shows the structural schematic diagrams of the hydraulic cylinder of the present embodiment.As shown in Fig. 2, the hydraulic cylinder of the present embodiment includes
Cylinder 1 is arranged in cylinder 1 and can be connected on first piston 2 simultaneously along the first piston 2 of the axial movement of cylinder 1, one end
Along the axially extending piston rod 3 of cylinder 1.
Cylinder 1 has the first cavity 5 positioned at the side back to piston rod 3 of first piston 2.First cavity 5 can draw
Enter hydraulic fluid to push piston rod 3 to be stretched out to the external of cylinder 1.During piston rod 3 bounces back to the inside of cylinder 1,
Hydraulic fluid is discharged in first cavity 5.
Piston rod 3 has the accommodating chamber 4 that can accommodate hydraulic fluid.Hydraulic fluid is introduced to push work in the first cavity 5
When stopper rod 3 is stretched out to the outside of cylinder 1, hydraulic fluid can be discharged in accommodating chamber 4, the increased amount phase of the hydraulic fluid in hydraulic cylinder
Reduce the amount of the hydraulic fluid of the discharge of accommodating chamber 4 for the prior art.
When piston rod 3 bounces back to the inside of cylinder 1 so that hydraulic fluid is discharged in the first cavity 5, accommodating chamber 4 can introduce
Hydraulic fluid, the amount that hydraulic fluid reduces in hydraulic cylinder reduce the introduced hydraulic fluid of accommodating chamber 4 compared with the existing technology
Amount.
Therefore, the hydraulic cylinder of the present embodiment improves hydraulic cylinder during piston rod 3 existing in the prior art moves
The big problem of the variable quantity of interior hydraulic fluid.
Piston rod 3 has the second axially extending cavity 6 along cylinder 1, and being provided in the second cavity 6 can be along the second chamber
The second piston 7 that body 6 moves, second piston 7 are fixed relative to cylinder 1, and accommodating chamber 4 includes living positioned at second for the second cavity 6
The part towards 2 side of first piston of plug 7.
When introducing hydraulic fluid in the first cavity 5 to push piston rod 3 to be stretched out to cylinder 1 external, first piston 2 and the
The distance between two pistons 7 reduce, therefore the volume of accommodating chamber 4 reduces, hydraulic fluid is discharged in accommodating chamber 4.
When piston rod 3 bounces back to the inside of cylinder 1 so that hydraulic fluid is discharged in the first cavity 5, first piston 2 and second
The distance between piston 7 increases, therefore the volume of accommodating chamber 4 increases, accommodating chamber 4 can introduce hydraulic fluid.
In the present embodiment, accommodating chamber 4 is surrounded by the peripheral wall of first piston 2, second piston 7 and the second cavity 6.
Piston rod 3 is extended from first piston 2 to the first end of cylinder 1, and the first end in cylinder 1 is arranged in second piston 7, with
The axial movement for avoiding second piston 7 from hindering first piston 2 along cylinder 1.
Optionally, the surface towards first piston 2 of second piston 7 is concordant with the inner face of the first end of cylinder 1；May be used also
With preferably, the surface towards first piston 2 of second piston 7 is away from first piston compared with the inner face of the first end of cylinder 1
2。
Second cavity 6 is provided with venthole positioned at the part back to first piston 2 of second piston 7, so that second lives
Plug 7 can be moved smoothly along the second cavity 6.
Hydraulic cylinder further includes making second piston 7 relative to 1 fixed connecting component 8 of cylinder, connecting component 8 and second piston
7 connections simultaneously extend to first piston 2, and the first through hole for allowing connecting component 8 to pass through, connecting component are provided on first piston 2
8 pass through first through hole and are connect with the cavity wall of the first cavity 5.
In the present embodiment, the cavity wall of the first cavity 5 includes the end wall of cylinder 1, the separate second piston 7 of connecting component 8
One end is connect with the end wall of cylinder 1.
Connecting component 8 includes tube-like piece, and one end of the close second piston 7 of tube-like piece is connected to accommodating chamber 4, tube-like piece
One end far from second piston 7 is used for 4 input hydraulic pressure fluid of accommodating chamber and for the hydraulic fluid in accommodating chamber 4 to be discharged.
The first passage 10 for being connected to accommodating chamber 4 and tube-like piece is provided in second piston 7.
The first hole 11 being connected to tube-like piece is provided in the cavity wall of first cavity 5.First hole 11 by cylinder 1 outer surface
To the end wall internal stretch of cylinder 1, to be connected to tube-like piece.
When introducing hydraulic fluid in the first cavity 5 to push piston rod 3 to be stretched out to the outside of cylinder 1, what accommodating chamber 4 was discharged
Hydraulic fluid is followed by first passage 10, tube-like piece and the first hole 11.
When piston rod 3 bounces back to the inside of cylinder 1 so that hydraulic fluid is discharged in the first cavity 5, the liquid of the introducing of accommodating chamber 4
Press fluid followed by 11 first passage 10 of the first hole, tube-like piece and first passage 10.
In the present embodiment, cylinder 1 has the third cavity 9 positioned at the side towards piston rod 3 of first piston 2.Third
Cavity 9 can introduce and be discharged hydraulic fluid.Since piston rod 3 is located in third cavity 9, therefore third cavity 9 is positioned at the
Annular space between one piston 2 and the end wall of cylinder 1.
When third cavity 9 introduces hydraulic fluid to push piston rod 3 to bounce back to the inside of cylinder 1, first piston 2 and the
The distance between two pistons 7 increase, and the volume of accommodating chamber 4 increases, accommodating chamber 4 introduces hydraulic fluid, while the first cavity 5 is discharged
Hydraulic fluid.
When introducing hydraulic fluid in the first cavity 5 to push piston rod 3 to be stretched out to the outside of cylinder 1, accommodating chamber 4 and third
Hydraulic fluid is discharged in cavity 9.
In conjunction with Fig. 2, the internal diameter of the first cavity 5 and the internal diameter of cylinder 1 are D, the connecting component being located inside the first cavity 5
8 outer diameter is d2, during 3 Moving Unit distance l of piston rod, the variable quantity v of the hydraulic fluid in the first cavity 51=l π
(D2-d2 2)。
The internal diameter of third cavity 9 is equal to the diameter d of piston rod 3, and the outer diameter of third cavity 9 is equal to the internal diameter D of cylinder 1.It is living
During 3 Moving Unit distance l of stopper rod, the variable quantity v of the hydraulic fluid in third cavity 92=l π (D2-d2)。
A diameter of d of accommodating chamber 40, the outer diameter for being located at the connecting component 8 inside accommodating chamber 4 is d2, 3 Moving Unit of piston rod
During distance l, the variable quantity v of the hydraulic fluid in the first cavity 53=l π (d0 2-d2 2)。
The variation of hydraulic fluid (including the hydraulic fluid in the first cavity 5, accommodating chamber 4 and third cavity 9) in hydraulic cylinder
Measure v4=v1-v2-v3=l π (d2-d0 2)。
Referring to Fig. 2, the range of piston rod 3 is L, thus in hydraulic cylinder hydraulic fluid maximum variable quantity V=L π
(d2-d0 2), the maximum variable quantity of hydraulic fluid namely hydraulic cylinder at most introduces or the amount of the hydraulic fluids of discharge in hydraulic cylinder.
In the case where being not provided with accommodating chamber 4 on piston rod 3 namely d0It is zero, the maximum of hydraulic fluid in hydraulic cylinder
Variable quantity V0=L π d2。
It can be seen that due to being provided with a diameter of d in piston rod 30Accommodating chamber 4, hydraulic fluid is most in hydraulic cylinder
Big variable quantity reduces V1=V-V0=L π d0 2.Therefore, the diameter of the diameter with piston rod 3 of accommodating chamber 4 is closer, in piston rod
During 3 movements, the amount of the variable quantity of the hydraulic fluid in hydraulic cylinder is smaller namely hydraulic cylinder introduces hydraulic fluid and row
The amount of the hydraulic fluid removed is closer.
Fig. 3 shows the structural schematic diagram of the hydraulic system of the present embodiment.In conjunction with shown in Fig. 2 and 3, the hydraulic pressure of the present embodiment
System includes above-mentioned hydraulic cylinder 30, the babinet 40 for accommodating hydraulic fluid and for for the hydraulic fluid pressurization in babinet 40
Pump 50.
Hydraulic fluid after pressurization can be delivered to the first cavity 5 to push piston rod 3 to be stretched to the outside of cylinder 1 by pump 50
Go out.Pump 50 also can be by the fluid conveying after pressurization to accommodating chamber 4 and third cavity 9 to push piston rod 3 to the inside of cylinder 1
Retraction.
The hydraulic fluid after pressurization in accommodating chamber 4 and third cavity 9 can push piston rod 3 to the inside of cylinder 1
Retraction, therefore increase the driving force of hydraulic cylinder.
As shown in figure 3, the hydraulic system of the present embodiment further includes reversal valve 60, reversal valve 60 has fluid inlet P, reflux
Mouth T, the first working hole A and the second working hole B.Wherein fluid inlet P is connected to pump 50, and refluxing opening T is connected to babinet 40, and first
Working hole A is connected to the first cavity 5 of hydraulic cylinder 30, and the third cavity 9 and accommodating chamber 4 of the second working hole B and hydraulic cylinder 30 connect
It is logical.
In the present embodiment, the second working hole B is connected to the first hole 11 on hydraulic cylinder, to realize the second working hole and accommodate
Chamber 4 is connected to.
Reversal valve 60 includes first state and the second state.Reversal valve 60 is in first state, the first working hole A and fluid
Import P conductings, the second working hole B are connected with refluxing opening T.Hydraulic fluid after 50 pressurization of pump enters the first cavity of hydraulic cylinder 30
5, to push outgoing stretching of the piston rod 3 to cylinder 1, the hydraulic fluid in third cavity 9 and accommodating chamber 4 to arrange to babinet 40.
In the second working condition, the first working hole A is connected reversal valve 60 with refluxing opening T, the second working hole B and fluid into
Mouth P conductings.Hydraulic fluid after 50 pressurization of pump respectively enters accommodating chamber 4 and third cavity 9, to push piston rod 3 towards cylinder 1
The hydraulic fluid of inside retraction, the discharge of the first cavity 5 is arranged to babinet 40.
According to the another aspect of the application, the present embodiment additionally provides a kind of crane, which includes above-mentioned liquid
Pressure system.Optionally, the hydraulic cylinder 30 of above-mentioned hydraulic fluid is for driving the arm of crane to rotate.
Embodiment two：
Fig. 4 shows the structural schematic diagram of the hydraulic cylinder of the present embodiment.As shown in figure 4, the hydraulic cylinder and reality of the present embodiment
The difference for applying the hydraulic cylinder of example one is：Hydraulic cylinder further includes the pipeline 14 for being connected to accommodating chamber 4 and third cavity 9.
In the present embodiment, accommodating chamber 4 is connected to third cavity 9, and hydraulic fluid is introduced to push piston in the first cavity 5
When bar 3 is stretched out to the outside of cylinder 1, the volume of third cavity 9 and accommodating chamber 4 reduces, and third cavity 9 and accommodating chamber 4 are arranged
Go out hydraulic fluid.
Accommodating chamber 4 and third cavity 9 also can introduce hydraulic fluid with push piston rod 3 to the inside of cylinder 1 bounce back,
Correspondingly the volume of the first cavity 5 reduces, and hydraulic fluid is discharged in the first cavity 5.
Fig. 5 shows the structural schematic diagram of another embodiment of the present embodiment.Referring to Fig. 5, it is arranged on piston rod 3 useful
In the second hole 12 of connection third cavity 9 and accommodating chamber 4, to realize that third cavity 9 is connected to accommodating chamber 4.
Optionally, the second hole 12 is located at one end of the close first piston 2 of piston rod 3.
Fig. 6 shows the structural schematic diagram of another embodiment of the present embodiment.Referring to Fig. 6, it is provided on first piston 2
Second channel 13 for being connected to accommodating chamber 4 and third cavity 9.
Embodiment three：
Fig. 7 shows the structural schematic diagram of the hydraulic cylinder of the present embodiment.Referring to Fig. 7, the present embodiment and embodiment one are not
It is same to be：Accommodating chamber 4 is connected to the first cavity 5.
In the present embodiment, the second through-hole 15 of connection the first cavity 5 and accommodating chamber 4 is provided on first piston 2.Accommodating chamber
4 are connected to the first cavity 5, without being connected to third cavity 9.
Exist referring to Fig. 7, when the first cavity 5 introduces hydraulic fluid with the external stretching for pushing piston rod 3 to cylinder 1, first
Piston 2 is moved to second piston 7, and the volume of accommodating chamber 4 reduces, and accommodating chamber 4 arranges hydraulic fluid to the first cavity.With piston rod
The prior art that accommodating chamber 4 is not provided on 3 is compared, and the amount of the first introduced hydraulic fluid of cavity 5 reduces 4 institute of accommodating chamber
The amount of the amount of the hydraulic fluid of discharge, the hydraulic fluid that third cavity 9 is discharged is same as the prior art.
Therefore, during piston rod 3 moves, the variable quantity of hydraulic fluid reduces compared with the prior art in hydraulic cylinder.
Therefore, the variable quantity for improving hydraulic fluid during piston rod 3 existing in the prior art moves in hydraulic cylinder is big
Problem
Fig. 8 shows the structural schematic diagram of another preferred embodiment of the present embodiment.As shown in figure 8, connecting component 8 is worn
It is located in the second through-hole 15, there is gap, so that accommodating chamber 4 and the first chamber between connecting component 8 and the circumferential surface of the second through-hole 15
Body 5 is connected.
The foregoing is merely exemplary embodiment of the present invention, are not intended to limit the invention, all spirit in the present invention
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of hydraulic cylinder, including：
Cylinder (1)；
First piston (2), setting is interior in the cylinder (1) and can be along the axial movement of the cylinder (1)；
Piston rod (3), one end are connected on the first piston (2) and along the axially extending of the cylinder (1),
The cylinder (1) has the first cavity (5) positioned at the side back to the piston rod (3) of the first piston (2),
First cavity (5) can introduce and be discharged hydraulic fluid,
It is characterized in that, the piston rod (3) has axially extending the second cavity (6) along the cylinder (1), the hydraulic pressure
Cylinder further includes can be along the mobile second piston (7) of second cavity (6), and the second piston (7) is relative to the cylinder
(1) fixed, second cavity (6) includes the receiving positioned at the direction first piston (2) side of the second piston (7)
Chamber (4), when first cavity (5) introduces hydraulic fluid, hydraulic fluid can be discharged in the accommodating chamber (4), described the
When hydraulic fluid is discharged in one cavity (5), the accommodating chamber (4) can introduce hydraulic fluid,
The cylinder (1) has the third cavity (9) being formed between the piston rod (3) and the cylinder (1), the third
Cavity (9) can introduce and be discharged hydraulic fluid, and hydraulic fluid is introduced to push the piston rod in the third cavity (9)
(3) when bouncing back to the inside of the cylinder (1), fluid is discharged in first cavity (5), and liquid is introduced in first cavity (5)
When pressure fluid is to push the piston rod (3) to be stretched out to the outside of the cylinder (1), flow of pressurized is discharged in the third cavity (9)
Body,
The third cavity (9) is connected to the accommodating chamber (4).
2. hydraulic cylinder according to claim 1, which is characterized in that further include making second piston (7) relative to the cylinder
(1) fixed connecting component (8), the connecting component (8) connect with the second piston (7) and to the first piston (2)
Extend, the first through hole for allowing the connecting component (8) to pass through, the connecting component (8) are provided on the first piston (2)
It is connect across the first through hole and with the cavity wall of first cavity (5).
3. hydraulic cylinder according to claim 2, which is characterized in that the connecting component (8) includes tube-like piece, the tubulose
Part is connected to close to one end of the second piston (7) with the accommodating chamber (4), the separate second piston of the tube-like piece
(7) one end is used for the accommodating chamber (4) input hydraulic pressure fluid and for the hydraulic fluid in the accommodating chamber (4) to be discharged.
4. hydraulic cylinder according to claim 3, which is characterized in that be provided on the second piston (7) for being connected to
State the first passage (10) of accommodating chamber (4) and the tube-like piece.
5. hydraulic cylinder according to claim 3, which is characterized in that be provided in the cavity wall of first cavity (5) and institute
The first hole (11) that one end far from the second piston (7) of tube-like piece is connected to is stated, first hole (11) is used for described
Accommodating chamber (4) input hydraulic pressure fluid and for the hydraulic fluid in the accommodating chamber (4) to be discharged.
6. hydraulic cylinder according to claim 3, which is characterized in that the cylinder (1), which has, is formed at described first
Third cavity (9) between piston rod (23) and the cylinder (1), the second end of third cavity (9) and the tube-like piece
Connection, the third cavity (9) can introduce and be discharged hydraulic fluid, and hydraulic fluid is introduced to push away in the third cavity (9)
When the dynamic piston rod (3) bounces back to the inside of the cylinder (1), fluid is discharged in first cavity (5), in first chamber
When body (5) introduces hydraulic fluid with the external stretching for pushing the piston rod (3) to the cylinder (1), the third cavity (9)
Hydraulic fluid is discharged.
7. hydraulic cylinder according to claim 1, which is characterized in that be provided on the piston rod (3) described for being connected to
The second hole (12) of third cavity (9) and the accommodating chamber (4).
8. hydraulic cylinder according to claim 1, which is characterized in that be provided on the first piston (2) for being connected to
State the second channel (13) of accommodating chamber (4) and the third cavity (9).
9. a kind of hydraulic system, which is characterized in that including：
Hydraulic cylinder described in claim 1 (30)；
Babinet (40), the hydraulic fluid for accommodating the accommodating chamber (4) and/or first cavity (5) discharge；And
It pumps (50), for pressurizeing for the hydraulic fluid in the babinet (40) and the hydraulic fluid after pressurization can be delivered to
First cavity (5) is to push the first piston (2) mobile.
10. hydraulic system according to claim 9, which is characterized in that the hydraulic system have the first working condition and
Second working condition,
In first working condition, after first cavity (5) is connected to the pump (50) to introduce pump (50) pressurization
Hydraulic fluid, the accommodating chamber (4) is connected to the babinet (40) arranging the hydraulic fluid in the accommodating chamber (4) to institute
State babinet (40)；
In second working condition, first cavity (5) is connected to the babinet (40) with will be in first cavity (5)
Hydraulic fluid arrange to the babinet, after the accommodating chamber (4) is connected to the pump (50) to introduce the pump (50) pressurization
Hydraulic fluid.
11. a kind of crane, which is characterized in that including the hydraulic system described in claim 9.
12. crane according to claim 11, which is characterized in that further include arm, the hydraulic cylinder is for driving institute
State arm rotation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611250872.9A CN106640834B (en) | 2016-12-30 | 2016-12-30 | Hydraulic cylinder, hydraulic system and crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611250872.9A CN106640834B (en) | 2016-12-30 | 2016-12-30 | Hydraulic cylinder, hydraulic system and crane |
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| CN106640834A CN106640834A (en) | 2017-05-10 |
| CN106640834B true CN106640834B (en) | 2018-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611250872.9A Active CN106640834B (en) | 2016-12-30 | 2016-12-30 | Hydraulic cylinder, hydraulic system and crane |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107165887A (en) * | 2017-07-07 | 2017-09-15 | 徐州徐工液压件有限公司 | A kind of oil storage hydraulic cylinder |
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| JP2011133007A (en) * | 2009-12-24 | 2011-07-07 | Ihi Construction Machinery Ltd | Fluid pressure cylinder |
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| JP4933862B2 (en) * | 2006-08-24 | 2012-05-16 | 北都建機サービス株式会社 | Hydraulic drive |
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| CN106640834A (en) | 2017-05-10 |
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