CN106640834A - Hydraulic cylinder, hydraulic system and crane - Google Patents

Hydraulic cylinder, hydraulic system and crane Download PDF

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Publication number
CN106640834A
CN106640834A CN201611250872.9A CN201611250872A CN106640834A CN 106640834 A CN106640834 A CN 106640834A CN 201611250872 A CN201611250872 A CN 201611250872A CN 106640834 A CN106640834 A CN 106640834A
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CN
China
Prior art keywords
cavity
cylinder
hydraulic
piston
hydraulic fluid
Prior art date
Application number
CN201611250872.9A
Other languages
Chinese (zh)
Other versions
CN106640834B (en
Inventor
单增海
王守伟
任印美
王冬
戚厚保
Original Assignee
徐州重型机械有限公司
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Priority to CN201611250872.9A priority Critical patent/CN106640834B/en
Publication of CN106640834A publication Critical patent/CN106640834A/en
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Publication of CN106640834B publication Critical patent/CN106640834B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1428Cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1447Pistons; Piston to piston rod assemblies

Abstract

The invention relates to a hydraulic cylinder, a hydraulic system and a crane. The hydraulic cylinder comprises a cylinder, a first piston and a piston rod, wherein the first piston is arranged in the cylinder, and can move in the axial direction of the cylinder; one end of the piston rod is connected to the first piston, and extends in the axial direction of the cylinder; the cylinder has a first cavity positioned on one side, opposite to the piston rod, of the first piston; the first cavity can introduce and drain a hydraulic fluid; and the piston rod has a second cavity for extending in the axial direction of the cylinder. The hydraulic cylinder further comprises a second piston capable of moving along the second cavity; the second piston is fixed corresponding to the cylinder; the second cavity includes an accommodating cavity positioned on one side, towards the first piston, of the second piston; when the hydraulic fluid is introduced in the first cavity, the accommodating cavity can drain the hydraulic fluid; and when the first cavity drains the hydraulic fluid, the accommodating cavity can introduce the hydraulic fluid. The hydraulic cylinder improves the problem of high variation of the hydraulic fluid in the hydraulic cylinder in the moving process of the piston rod in the prior art.

Description

Hydraulic cylinder, hydraulic system and crane
Technical field
The present invention relates to engineering equipment field, in particular to a kind of hydraulic cylinder, hydraulic system and crane.
Background technology
Fig. 1 shows the structural representation of the hydraulic cylinder of prior art.It is shown in Figure 1, hydraulic cylinder bag cylinder 1 ', setting In the cylinder 1 ' and can along the piston 2 ' of the axial movement of cylinder 1 ' be connected to the upper piston rod of piston 2 ' 3 '.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 discharge hydraulic fluid.
In prior art, hydraulic system includes hydraulic cylinder, the casing for accommodating hydraulic fluid and for in casing The pump of hydraulic fluid pressurization.First cavity 4 ' and the second cavity 5 ' can be connected with pump, the first cavity 4 ' and the second cavity 5 ' Also can connect with casing.
During hydraulic fluid after connecting with pump in the first cavity 4 ' to introduce pump pressurization, the second cavity 5 ' is by its internal liquid Pressure fluid is arranged to casing, and piston rod 3 ' stretches out to cylinder 1 ' is outside;After connecting with pump in the second cavity 5 ' to introduce pump pressurization During hydraulic fluid, the first cavity 4 ' arranges its internal hydraulic fluid to casing, and piston rod 3 ' is to the internal retraction of cylinder 1 '.
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 ' during axial movement unit distance l of cylinder 1 ', the first chamber The introducing of body 4 ' or volume v of the hydraulic fluid discharged1=l S1=l π D2/4。
The external diameter of piston rod 3 ' is d, the area S in the section perpendicular to cylinder 1 ' of the second cavity 5 '2=π (D2-d2)/4, Piston 2 ' during axial movement unit distance l of cylinder 1 ', the body of hydraulic fluid that the second cavity 5 ' is introduced or discharged 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 ultimate range of the axial movement of cylinder 1 '.During displacement L of piston rod 3 ', 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 casing is equal to V3, therefore casing Minimum volume be V3
Therefore, the external 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 of the casing being equipped with also bigger.
With the increase that various engineering equipments need to the driving force of hydraulic cylinder, the size of hydraulic cylinder constantly increases, phase The outside diameter d of the piston rod 3 ' of the hydraulic cylinder answered is also required to increase, it is therefore desirable to which the bigger casing being equipped with for hydraulic cylinder is accommodating Hydraulic fluid.
The content of the invention
The present invention is intended to provide a kind of hydraulic cylinder, hydraulic system and crane, to improve piston present in prior art The big problem of the variable quantity of the hydraulic fluid in mobile process in hydraulic cylinder.
One side according to embodiments of the present invention, the invention provides a kind of hydraulic cylinder, including:
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, and the first cavity can be introduced and arranged Go out hydraulic fluid,
Piston rod has the second axially extending cavity along cylinder, and hydraulic cylinder also includes can be along the movement of the second cavity Second piston, second piston is fixed relative to cylinder, the second cavity include being located at second piston towards first piston side Accommodating chamber, when the first cavity introduces hydraulic fluid, accommodating chamber can discharge hydraulic fluid, and in the first cavity hydraulic fluid is discharged When, accommodating chamber can introduce hydraulic fluid.
Alternatively, also including the connection member for making second piston fix relative to cylinder, connection member connects with second piston Connect and extend to first piston, being provided with first piston allows the first through hole that passes through of connection member, connection member is through the One through hole is simultaneously connected with the cavity wall of the first cavity.
Alternatively, connection member includes tube-like piece, and one end of the close second piston of tube-like piece connects with accommodating chamber, tubulose One end away from second piston of part be used for accommodating chamber input hydraulic pressure fluid and for discharging accommodating chamber in hydraulic fluid.
Alternatively, the first passage for connecting accommodating chamber and tube-like piece is provided with second piston.
Alternatively, the first hole connected with the second end of tube-like piece is provided with the cavity wall of the first cavity, the first hole is used for Hydraulic fluid in accommodating chamber input hydraulic pressure fluid and for discharging accommodating chamber.
Alternatively, cylinder has the 3rd cavity being formed between First piston bar and cylinder, the 3rd cavity and pipe The second end connection of shape part, the 3rd cavity can introduce and discharge hydraulic fluid, introduce hydraulic fluid to promote in the 3rd cavity Piston rod to the inside of cylinder bounce back when, the first cavity discharges fluid, and hydraulic fluid is introduced promoting piston rod in the first cavity When stretching out to the outside of cylinder, the 3rd cavity discharges hydraulic fluid.
Alternatively, cylinder has the 3rd cavity being formed between piston rod and cylinder, and the 3rd cavity can be introduced and arranged Go out hydraulic fluid, when the 3rd cavity introducing hydraulic fluid is to promote piston rod to bounce back to the inside of cylinder, the first cavity is discharged Fluid, when the first cavity introduces hydraulic fluid to promote piston rod to stretch out to the outside of cylinder, the 3rd cavity discharges flow of pressurized Body.
Alternatively, the 3rd cavity is connected with accommodating chamber.
Alternatively, the second hole for connecting the 3rd cavity and accommodating chamber is provided with piston rod.
Alternatively, the second channel for connecting accommodating chamber and the 3rd cavity is provided with first piston.
Alternatively, accommodating chamber is connected with the first cavity.
Alternatively, the second through hole for connecting the first cavity and accommodating chamber is provided with first piston.
Other side according to embodiments of the present invention, present invention also provides a kind of hydraulic system, hydraulic system includes:
Above-mentioned hydraulic cylinder;
Casing, for accommodating the hydraulic fluid that accommodating chamber and/or the first cavity are discharged;
Pump, for in casing hydraulic fluid pressurization and the hydraulic fluid after pressurization can be delivered to the first cavity To promote first piston movement.
Alternatively, hydraulic system has the first working condition and the second working condition,
In the first working condition, the first cavity connects to introduce the hydraulic fluid after pump pressurizes, accommodating chamber and casing with pump Connect the hydraulic fluid for accommodating intracavity to be arranged to casing;
In the second working condition, the first cavity is connected so that the hydraulic fluid in the first cavity is arranged to casing with casing, is held Receive chamber connect with pump with introduce pump pressurization after hydraulic fluid.
Another aspect according to embodiments of the present invention, present invention also provides a kind of crane, alternatively, including it is above-mentioned Hydraulic system.
Alternatively, also including arm, hydraulic cylinder is used to drive arm to rotate.
Using the technical scheme of the application, piston rod has the accommodating chamber that can accommodate hydraulic fluid.Draw in the first cavity Enter hydraulic fluid with promote piston rod to the outside of cylinder stretch out when, accommodating chamber can discharge hydraulic fluid, the liquid in hydraulic cylinder The amount that pressure fluid increases reduces the amount of the hydraulic fluid of accommodating chamber discharge relative to prior art.
When piston rod bounces back so that the first cavity discharges hydraulic fluid to the inside of cylinder, accommodating chamber can introduce hydraulic pressure Fluid, the amount that hydraulic fluid is reduced in hydraulic cylinder reduces the amount of the introduced hydraulic fluid of accommodating chamber relative to prior art.
Therefore, during the hydraulic cylinder of the present embodiment improves the movement of piston rod present in prior art in hydraulic cylinder Hydraulic fluid the big problem of variable quantity.
By referring to the drawings to the present invention exemplary embodiment detailed description, the present invention further feature and its Advantage will be made apparent from.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 shows the structural representation of the hydraulic cylinder of prior art;
Fig. 2 shows the structural representation of the hydraulic cylinder of the first embodiment of the present invention;
Fig. 3 shows the structural representation of the hydraulic system of the first embodiment of the present invention;
Fig. 4 shows the structural representation of the hydraulic cylinder of the second embodiment of the present invention;
Fig. 5 shows the structural representation of another preferred implementation of the hydraulic cylinder of the second embodiment of the present invention;
Fig. 6 shows the structural representation of another preferred implementation of the hydraulic cylinder of the second embodiment of the present invention;
Fig. 7 shows the structural representation of the hydraulic cylinder of the third embodiment of the present invention;And
Fig. 8 shows the structural representation of another preferred implementation 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;1st, cylinder;2nd, first Piston;3rd, piston rod;4th, accommodating chamber;5th, the first cavity;6th, the second cavity;7th, second piston;8th, connection member;9th, the 3rd chamber Body;10th, first passage;11st, the first hole;12nd, the second through hole;13rd, second channel;14th, pipeline;15th, the second through hole;30th, hydraulic pressure Cylinder;40th, casing;50th, pump;60th, reversal valve.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Below It is illustrative to the description only actually of at least one exemplary embodiment, never conduct is to the present invention and its application or makes Any restriction.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Embodiment one:
Fig. 2 shows the structural representation of the hydraulic cylinder of the present embodiment.As shown in Fig. 2 the hydraulic cylinder of the present embodiment includes Cylinder 1, it is arranged in cylinder 1 and can be connected on first piston 2 simultaneously along the first piston 2, one end of the axial movement of cylinder 1 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 promote piston rod 3 to stretch out to the outside of cylinder 1.During piston rod 3 bounces back to the inside of cylinder 1, First cavity 5 discharges hydraulic fluid.
Piston rod 3 has the accommodating chamber 4 that can accommodate hydraulic fluid.Introduce hydraulic fluid to promote work in the first cavity 5 Stopper rod 3 to the outside of cylinder 1 stretch out when, accommodating chamber 4 can discharge hydraulic fluid, the amount phase that hydraulic fluid in hydraulic cylinder increases For the amount of the hydraulic fluid that prior art reduces the discharge of accommodating chamber 4.
When piston rod 3 bounces back so that the first cavity 5 discharges hydraulic fluid to the inside of cylinder 1, accommodating chamber 4 can be introduced Hydraulic fluid, the amount that hydraulic fluid is reduced in hydraulic cylinder reduces the introduced hydraulic fluid of accommodating chamber 4 relative to prior art Amount.
Therefore, the hydraulic cylinder of the present embodiment improves hydraulic cylinder during piston rod 3 present in prior art is moved The big problem of the variable quantity of interior hydraulic fluid.
Piston rod 3 has the second axially extending cavity 6 along cylinder 1, is provided with along the second chamber in the second cavity 6 The second piston 7 of the movement of body 6, second piston 7 is fixed relative to cylinder 1, and accommodating chamber 4 includes living positioned at second for the second cavity 6 The part towards the side of first piston 2 of plug 7.
When the first cavity 5 introduces hydraulic fluid to promote piston rod 3 to stretch out to the outside of cylinder 1, first piston 2 and the The distance between two pistons 7 reduce, therefore the volume of accommodating chamber 4 reduces, accommodating chamber 4 discharges hydraulic fluid.
When piston rod 3 bounces back so that the first cavity 5 discharges hydraulic fluid to the inside of cylinder 1, 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 perisporium of first piston 2, the cavity 6 of second piston 7 and second.
First end of the piston rod 3 from first piston 2 to cylinder 1 extends, and second piston 7 is arranged on the first end of cylinder 1, with The axial movement for avoiding second piston 7 from hindering first piston 2 along cylinder 1.
Alternatively, 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 So that 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。
The part back to first piston 2 positioned at second piston 7 of the second cavity 6 is provided with passage, so that second lives Plug 7 can be moved smoothly along the second cavity 6.
Hydraulic cylinder also includes the connection member 8 for making second piston 7 fix relative to cylinder 1, connection member 8 and second piston 7 connections simultaneously extend to first piston 2, and the first through hole for allowing connection member 8 to pass through, connection member are provided with first piston 2 8 pass through first through hole and are connected 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, connection member 8 away from second piston 7 One end is connected with the end wall of cylinder 1.
Connection member 8 includes tube-like piece, and one end of the close second piston 7 of tube-like piece connects with accommodating chamber 4, tube-like piece Away from second piston 7 one end be used for the input hydraulic pressure fluid of accommodating chamber 4 and for discharging accommodating chamber 4 in hydraulic fluid.
The first passage 10 for connecting accommodating chamber 4 and tube-like piece is provided with second piston 7.
The first hole 11 connected with tube-like piece is provided with the cavity wall of the first cavity 5.First hole 11 by cylinder 1 outer surface Extend to the inside of the end wall of cylinder 1, to connect with tube-like piece.
When the first cavity 5 introduces hydraulic fluid to promote piston rod 3 to stretch out to the outside of cylinder 1, what accommodating chamber 4 was discharged Hydraulic fluid flows through successively first passage 10, tube-like piece and the first hole 11.
When piston rod 3 bounces back so that the first cavity 5 discharges hydraulic fluid to the inside of cylinder 1, the liquid that accommodating chamber 4 is introduced Pressure fluid flows through successively the first passage 10, tube-like piece of the first hole 11 and first passage 10.
In the present embodiment, cylinder 1 has the 3rd cavity 9 positioned at the side towards piston rod 3 of first piston 2.3rd Cavity 9 can introduce and discharge hydraulic fluid.Because, piston rod 3 is located in the 3rd cavity 9, therefore the 3rd cavity 9 is positioned at the Annular space between one piston 2 and the end wall of cylinder 1.
Introduce hydraulic fluid in the 3rd cavity 9 with promote piston rod 3 to the inside of cylinder 1 bounce back when, first piston 2 and the The distance between two pistons 7 increase, and the volume increase of accommodating chamber 4, accommodating chamber 4 introduce hydraulic fluid, while the first cavity 5 is discharged Hydraulic fluid.
When the first cavity 5 introduces hydraulic fluid to promote piston rod 3 to stretch out to the outside of cylinder 1, accommodating chamber 4 and the 3rd Cavity 9 discharges hydraulic fluid.
With reference to Fig. 2, the internal diameter of the first cavity 5 is D with the internal diameter of cylinder 1, the connection member inside the first cavity 5 8 external diameter is d2, the Moving Unit of piston rod 3 during the l, the variable quantity v of the hydraulic fluid in the first cavity 51=l π (D2-d2 2)。
The internal diameter of the 3rd cavity 9 is equal to the diameter d of piston rod 3, and the external diameter of the 3rd cavity 9 is equal to the internal diameter D of cylinder 1.It is living The Moving Unit of stopper rod 3 during the l, the variable quantity v of the hydraulic fluid in the 3rd cavity 92=l π (D2-d2)。
A diameter of d of accommodating chamber 40, the external diameter of the connection member 8 inside accommodating chamber 4 is d2, the Moving Unit of piston rod 3 During l, the variable quantity v of the hydraulic fluid in the first cavity 53=l π (d0 2-d2 2)。
The change of hydraulic fluid (comprising the hydraulic fluid in the first cavity 5, the cavity 9 of accommodating chamber 4 and the 3rd) in hydraulic cylinder Amount v4=v1-v2-v3=l π (d2-d0 2)。
Referring to Fig. 2, the range of piston rod 3 is the maximum variable quantity V=L π of hydraulic fluid in L, therefore hydraulic cylinder (d2-d0 2), the amount of the maximum variable quantity namely hydraulic cylinder of hydraulic fluid at most introducing or the hydraulic fluid discharged in hydraulic cylinder.
In the case of accommodating chamber 4 being not provided with piston rod 3, namely d0It is zero, the maximum of hydraulic fluid in hydraulic cylinder Variable quantity V0=L π d2
As can be seen here, 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 of accommodating chamber 4 and piston rod 3 is closer in piston rod During 3 movements, the variable quantity of the hydraulic fluid in hydraulic cylinder is less, namely the amount of the hydraulic fluid of hydraulic cylinder introducing and row The amount of the hydraulic fluid for removing closer to.
Fig. 3 shows the structural representation of the hydraulic system of the present embodiment.With reference to shown in Fig. 2 and 3, the hydraulic pressure of the present embodiment System includes above-mentioned hydraulic cylinder 30, the casing 40 for accommodating hydraulic fluid and for pressurizeing for the hydraulic fluid in casing 40 Pump 50.
Hydraulic fluid after pressurization can be delivered to the first cavity 5 to promote piston rod 3 to stretch to the outside of cylinder 1 by pump 50 Go out.Fluid after pressurization also can be delivered to the cavity 9 of accommodating chamber 4 and the 3rd to promote piston rod 3 to the inside of cylinder 1 by pump 50 Retraction.
The hydraulic fluid after pressurization in the cavity 9 of accommodating chamber 4 and the 3rd can promote 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 also includes reversal valve 60, reversal valve 60 has fluid inlet P, backflow Mouth T, the first working hole A and the second working hole B.Wherein fluid inlet P is connected with pump 50, and refluxing opening T is connected with casing 40, and first Working hole A is connected with the first cavity 5 of hydraulic cylinder 30, and the second working hole B connects with the 3rd cavity 9 and accommodating chamber 4 of hydraulic cylinder 30 It is logical.
In the present embodiment, the second working hole B is connected with the first hole 11 on hydraulic cylinder, to realize the second working hole and accommodate Chamber 4 connects.
Reversal valve 60 includes first state and the second state.Reversal valve 60 in first state, the first working hole A and fluid Import P is turned on, and the second working hole B and refluxing opening T is turned on.Hydraulic fluid after the pressurization of pump 50 enters the first cavity of hydraulic cylinder 30 5, to promote piston rod 3 to stretch out to the outgoing of cylinder 1, the hydraulic fluid in the 3rd cavity 9 and accommodating chamber 4 is arranged to casing 40.
In the second working condition, the first working hole A and refluxing opening T is turned on reversal valve 60, and the second working hole B enters with fluid Mouth P conductings.Hydraulic fluid after pump 50 pressurizes respectively enters the cavity 9 of accommodating chamber 4 and the 3rd, to promote piston rod 3 towards cylinder 1 Inside retraction, the hydraulic fluid that the first cavity 5 is discharged is arranged to casing 40.
According to the another aspect of the application, the present embodiment additionally provides a kind of crane, and the crane includes above-mentioned liquid Pressure system.Alternatively, the hydraulic cylinder 30 of above-mentioned hydraulic fluid is used to drive the arm of crane to rotate.
Embodiment two:
Fig. 4 shows the structural representation 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 also includes the pipeline 14 of the connection cavity 9 of accommodating chamber 4 and the 3rd.
In the present embodiment, accommodating chamber 4 is connected with the 3rd cavity 9, introduces hydraulic fluid to promote piston in the first cavity 5 Bar 3 to the outside of cylinder 1 stretch out when, the volume of the 3rd cavity 9 and accommodating chamber 4 reduces, and the 3rd cavity 9 and accommodating chamber 4 are arranged Go out hydraulic fluid.
The cavity 9 of accommodating chamber 4 and the 3rd also can introduce hydraulic fluid to promote piston rod 3 to bounce back to the inside of cylinder 1, Correspondingly the volume of the first cavity 5 reduces, and the first cavity 5 discharges hydraulic fluid.
Fig. 5 shows the structural representation of another embodiment of the present embodiment.Referring to Fig. 5, on piston rod 3 use is provided with In the cavity 9 of connection the 3rd and the second hole 12 of accommodating chamber 4, so as to realize that the 3rd cavity 9 is connected with accommodating chamber 4.
Alternatively, the second hole 12 is located at one end of the close first piston 2 of piston rod 3.
Fig. 6 shows the structural representation of another embodiment of the present embodiment.Referring to Fig. 6, it is provided with first piston 2 For connecting the second channel 13 of the cavity 9 of accommodating chamber 4 and the 3rd.
Embodiment three:
Fig. 7 shows the structural representation of the hydraulic cylinder of the present embodiment.Referring to Fig. 7, the present embodiment is with embodiment one not It is same to be:Accommodating chamber 4 is connected with the first cavity 5.
In the present embodiment, the second through hole 15 of the first cavity 5 of connection and accommodating chamber 4 is provided with first piston 2.Accommodating chamber 4 connect with the first cavity 5, and do not connect with the 3rd cavity 9.
Exist referring to Fig. 7, the first cavity 5 introduce hydraulic fluid with promote piston rod 3 to the outside of cylinder 1 stretch out when, first Piston 2 to second piston 7 is moved, 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 with 3 is compared, and the amount of the introduced hydraulic fluid of the first cavity 5 reduces the institute of accommodating chamber 4 The amount of the hydraulic fluid of discharge, the amount of the hydraulic fluid that the 3rd cavity 9 is discharged is same as the prior art.
Therefore, during the movement of piston rod 3, the variable quantity hinge structure of hydraulic fluid reduces in hydraulic cylinder. Therefore, the variable quantity for improving hydraulic fluid during piston rod 3 present in prior art is moved in hydraulic cylinder is big Problem.
Fig. 8 shows the structural representation of another preferred implementation of the present embodiment.As shown in figure 8, connection member 8 is worn In being located at the second through hole 15, there is gap, so that the chamber of accommodating chamber 4 and first between the side face of the through hole 15 of connection member 8 and second Body 5 is connected.
The exemplary embodiment of the present invention is the foregoing is only, not to limit the present invention, all spirit in the present invention Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.

Claims (16)

1. a kind of hydraulic cylinder, including:
Cylinder (1);
First piston (2), is arranged in the cylinder (1) and can be along the axial movement of the cylinder (1);
Piston rod (3), one end is connected on the first piston (2) and along the axially extending of the cylinder (1),
First cavity (5) of the cylinder (1) with the side back to the piston rod (3) for being located at the first piston (2), First cavity (5) can introduce and discharge hydraulic fluid,
Characterized in that, the piston rod (3) is with axially extending the second cavity (6) along the cylinder (1), the hydraulic pressure Cylinder also 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 of the direction first piston (2) side for being located at the second piston (7) Chamber (4), when first cavity (5) introduces hydraulic fluid, the accommodating chamber (4) can discharge hydraulic fluid, described the When one cavity (5) discharges hydraulic fluid, the accommodating chamber (4) can introduce hydraulic fluid.
2. hydraulic cylinder according to claim 1, it is characterised in that also including making second piston (7) relative to the cylinder (1) fixed connection member (8), the connection member (8) is connected and to the first piston (2) with the second piston (7) Extend, the first through hole for allowing the connection member (8) to pass through, the connection member (8) are provided with the first piston (2) It is connected through the first through hole and with the cavity wall of first cavity (5).
3. hydraulic cylinder according to claim 2, it is characterised in that the connection member (8) including tube-like piece, the tubulose One end of the close described second piston (7) of part connects with the accommodating chamber (4), the tube-like piece away from the second piston (7) one end be used for the accommodating chamber (4) input hydraulic pressure fluid and for discharging the accommodating chamber (4) in hydraulic fluid.
4. hydraulic cylinder according to claim 3, it is characterised in that be provided with for connecting on the second piston (7) State the first passage (10) of accommodating chamber (4) and the tube-like piece.
5. hydraulic cylinder according to claim 3, it is characterised in that be provided with and institute in the cavity wall of first cavity (5) First hole (11) of the second end connection of tube-like piece is stated, first hole (11) is for the accommodating chamber (4) input hydraulic pressure stream Body and for discharging the accommodating chamber (4) in hydraulic fluid.
6. hydraulic cylinder according to claim 3, it is characterised in that the cylinder (1) is with being formed at described first The 3rd cavity (9) between piston rod (23) and the cylinder (1), the second end of the 3rd cavity (9) and the tube-like piece Connection, the 3rd cavity (9) can introduce and discharge hydraulic fluid, introduce hydraulic fluid to push away in the 3rd cavity (9) Move the piston rod (3) to the inside of the cylinder (1) bounce back when, first cavity (5) discharges fluid, in first chamber Body (5) introduce hydraulic fluid with promote the piston rod (3) to the outside of the cylinder (1) stretch out when, the 3rd cavity (9) Discharge hydraulic fluid.
7. hydraulic cylinder according to claim 1, it is characterised in that the cylinder (1) is with being formed at the piston rod (3) The 3rd cavity (9) between the cylinder (1), the 3rd cavity (9) can introduce and discharge hydraulic fluid, described Three cavitys (9) introduce hydraulic fluid with promote inside from the piston rod (3) to the cylinder (1) bounce back when, first chamber Body (5) discharges fluid, introduces hydraulic fluid to promote the piston rod (3) to the cylinder (1) in first cavity (5) When outside is stretched out, the 3rd cavity (9) discharges hydraulic fluid.
8. hydraulic cylinder according to claim 1, it is characterised in that the 3rd cavity (9) and the accommodating chamber (4) are even It is logical.
9. hydraulic cylinder according to claim 8, it is characterised in that be provided with the piston rod (3) described for connecting Second hole (12) of the 3rd cavity (9) and the accommodating chamber (4).
10. hydraulic cylinder according to claim 8, it is characterised in that be provided with for connecting on the first piston (2) State the second channel (13) of accommodating chamber (4) and the 3rd cavity (9).
11. hydraulic cylinders according to claim 1, it is characterised in that the accommodating chamber (4) is with first cavity (5) even It is logical.
12. hydraulic cylinders according to claim 11, it is characterised in that be provided with for connecting on the first piston (2) First cavity (5) and second through hole (15) of the accommodating chamber (4).
13. a kind of hydraulic systems, it is characterised in that include:
Hydraulic cylinder described in claim 1 (30);
Casing (40), for accommodating the hydraulic fluid that the accommodating chamber (4) and/or first cavity (5) are discharged;And
Pump (50), for pressurizeing and being delivered to the hydraulic fluid after pressurization for the hydraulic fluid in the casing (40) First cavity (5) is moved with promoting the first piston (2).
14. hydraulic systems according to claim 13, it is characterised in that the hydraulic system have the first working condition and Second working condition,
In first working condition, after first cavity (5) connects to introduce the pump (50) pressurization with the pump (50) Hydraulic fluid, the accommodating chamber (4) connects the hydraulic fluid in the accommodating chamber (4) to be arranged to institute with the casing (40) State casing (40);
In second working condition, first cavity (5) connects with by first cavity (5) with the casing (40) Hydraulic fluid arrange to the casing, the accommodating chamber (4) connect with the pump (50) with introduce the pump (50) pressurization after Hydraulic fluid.
15. a kind of cranes, it is characterised in that including the hydraulic system described in claim 13.
16. cranes according to claim 15, it is characterised in that also including arm, the hydraulic cylinder is used to drive institute State arm rotation.
CN201611250872.9A 2016-12-30 2016-12-30 Hydraulic cylinder, hydraulic system and crane CN106640834B (en)

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