CN105179361B - A kind of hydraulic cushion oil cylinder and crane - Google Patents
A kind of hydraulic cushion oil cylinder and crane Download PDFInfo
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- CN105179361B CN105179361B CN201510551571.9A CN201510551571A CN105179361B CN 105179361 B CN105179361 B CN 105179361B CN 201510551571 A CN201510551571 A CN 201510551571A CN 105179361 B CN105179361 B CN 105179361B
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Abstract
The present invention relates to a kind of hydraulic cushion oil cylinder and crane, hydraulic cushion oil cylinder includes：Cylinder barrel (4), piston component and individual buffer device (5), the first cavity volume (9) is formed between piston component and the cylinder bottom (7) of cylinder barrel (4), cylinder bottom (7) is provided with hollow structure, individual buffer device (5) is movingly located in hollow structure, and form pressure balance chamber between the blind end of one end and cylinder bottom (7), the oil duct set in individual buffer device (5) respectively with the first cavity volume (9), pressure balance chamber connects with the hydraulic fluid port (A) being opened on cylinder barrel (4), individual buffer device (5) can change the connection section of the first cavity volume (9) and hydraulic fluid port (A) under the promotion of piston component, to be throttled when being flowed out to the hydraulic oil in the first cavity volume (9) from hydraulic fluid port (A).Such a hydraulic cushion oil cylinder can lift reliability during work, avoid hydraulic jack from being damaged as far as possible.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, more particularly to a kind of hydraulic cushion oil cylinder and crane.
Background technology
Front-handling mobile crane is installed in voluntarily carries telescopic jib on tire chassis, in front handling container
Crane, with the development of front-handling mobile crane suspender, more and more higher is required to the functional reliability of its cushion cylinder.Its
In, cushion cylinder is that buffer unit is employed inside it, can realize the hydraulic jack to successively decrease in stroke terminal velocity.
Traditional front-handling mobile crane suspender uses internal damping control mode, its structure and the course of work with cushion cylinder
As shown in FIG. 1 to 3, referring to Fig. 1, by HYDRAULIC CONTROL SYSTEM rod chamber 8a oil-feeds, piston rod 1a is promoted to move right, if living
The cushion pins 5a of stopper rod 1a ends is not inserted into the cushion hole 6a on cylinder bottom 7a, the buffered hole 6a oil returns of fluid in rodless cavity 9a,
Then piston rod 1a is moved right at a high speed.HYDRAULIC CONTROL SYSTEM rod chamber 8a continues oil-feed, and piston rod 1a continues to move right, referring to
Cushion pins 5a on Fig. 2 and Fig. 3, piston rod 1a is initially inserted into the cushion hole 6a on cylinder bottom 7a, forms between the two between cooperation
Gap 10a, return oil pressure is generated, at this moment the fluid in rodless cavity 9a realizes throttling buffering through fit clearance 10a oil returns.With
Piston rod 1a to continue to move right, cushion pins 5a and cushion hole 6a fit clearance 10a are elongated, throttling back pressure increase, buffering
Effect strengthens, until piston rod 1a moves right the end pooling feature for terminal, realizing cushion cylinder.
Such a hydraulic cushion cylinder structure is simple, and throttling buffering positive effect, but in order to realize preferably buffering effect
Fruit, its fit clearance 10a is smaller, therefore requires higher to cushion pins 5a and cushion hole 6a axiality, due to manufacturing and assembling is deposited
Sealing ring 3a is employed between certain error, and piston 2a and cylinder barrel 4a, piston rod can not be avoided in use
Certain radial missing be present, then will likely be pulled between cushion pins 5a and cushion hole 6a, glued feelings in 1a by radial load
Condition, hydraulic jack will be damaged when serious.
The content of the invention
The purpose of the present invention is to propose to a kind of hydraulic cushion oil cylinder and crane, it is possible to increase during hydraulic cushion cylinder efficient
Reliability.
To achieve the above object, one aspect of the present invention provides a kind of hydraulic cushion oil cylinder, including：Cylinder barrel 4, piston component
With individual buffer device 5, the first cavity volume 9 is formed between the cylinder bottom 7 of piston component and cylinder barrel 4, cylinder bottom 7 is provided with hollow structure, solely
Vertical buffer unit 5 is movingly located in hollow structure, and forms pressure balance chamber between the blind end of one end and cylinder bottom 7,
The oil duct set in individual buffer device 5 connects with the first cavity volume 9, pressure balance chamber and the hydraulic fluid port A that is opened on cylinder barrel 4 respectively,
Individual buffer device 5 can change the first cavity volume 9 and hydraulic fluid port A connection section under the promotion of piston component, to hold to first
Hydraulic oil in chamber 9 is throttled when being flowed out from hydraulic fluid port A.
Further, pressure balance intracavitary is provided with flexible member, can make individual buffer in piston component counter motion
Device 5 resets.
Further, the oil duct residing for hydraulic fluid port A is provided with the collateral branch's oil duct connected with the first cavity volume 9, is set in collateral branch's oil duct
There is check valve 6, the unilaterally connected from hydraulic fluid port A to the first cavity volume 9 can be realized.
Further, the poroid cavity that hollow structure is coaxially disposed for the center line with hydraulic cushion oil cylinder, individual buffer
Device 5 is the column structure being adapted with poroid cavity, and one end of individual buffer device 5 is extend into the first cavity volume 9, the other end
Pressure balance chamber is formed between the blind end of cylinder bottom 7.
Further, the oil duct set in individual buffer device 5 includes：Radially it is opened in individual buffer device 5 and extend into the
First oil duct 51 of one end in one cavity volume 9, the second oil duct 52 for being radially opened in the position corresponding with hydraulic fluid port A and axial direction
It is opened in the 3rd oil duct 53 between the first oil duct 51 and the second oil duct 52 and interconnected, the first oil duct 51 and the second oil duct 52
Respectively the first hydraulic fluid port 11 and the second hydraulic fluid port 12 are formed on the surface of individual buffer device 5.
Further, pressure compensation opening 10 is offered between the second oil duct 52 and pressure balance chamber, the first cavity volume 9 can be made
It is interconnected with pressure balance chamber.
Further, the second hydraulic fluid port 12 is wedge-shaped annular groove, can be staggered in the second oil duct 52 and the oil duct residing for hydraulic fluid port A
Afterwards, remain to keep the second hydraulic fluid port 12 to connect with hydraulic fluid port A.
Further, in addition to adjusting screw 14, the blind end that adjusting screw 14 is arranged on cylinder bottom 7 are relative with flexible member
The position answered, it is capable of the pretightning force size of regulation elasticity element.
Further, individual buffer device 5 is provided with recess close to the side of pressure balance chamber, and flexible member is spring
13, the both ends of spring 13 act against the bottom of recess and the blind end of cylinder bottom 7 respectively.
Further, hollow structure is provided with boss close to the side of the first cavity volume 9, can be resetted in individual buffer device 5
Shi Jinhang is spacing.
Further, in addition to sealing ring 3, sealing ring 3 be arranged on individual buffer device 5 and hollow structure mating surface it
Between.
To achieve the above object, another aspect of the present invention provides a kind of crane, including the liquid described in above-described embodiment
Press cushion cylinder.
Based on above-mentioned technical proposal, the hydraulic cushion oil cylinder of the embodiment of the present invention, individual buffer is filled by piston component
Put and carry out contacting travel control, individual buffer device is changed the first cavity volume and hydraulic fluid port A's under the promotion of piston component
Section is connected, to be throttled to the hydraulic oil in the first cavity volume during being flowed out from hydraulic fluid port A, so as to realize buffering
The end pooling feature of oil cylinder.For such a hydraulic cushion oil cylinder, the processing of cushion cylinder itself and alignment error will not conduct
To buffer structure part, thus processing to cushion cylinder and installation accuracy require relatively low；And existing skill can be effectively prevented from
In art between cushion pins and cushion hole cause to pull gluing due to axiality the problems such as, so as to Promoting Layered Buffer cylinder efficient
Reliability.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of hydraulic cushion oil cylinder in the prior art；
Fig. 2 is the structural representation that the hydraulic cushion oil cylinder shown in Fig. 1 is located in buffering course；
Fig. 3 is located at the structural representation of buffering end for the hydraulic cushion oil cylinder shown in Fig. 1；
Fig. 4 is the structural representation of hydraulic cushion oil cylinder of the present invention；
Fig. 5 is the structural representation that the hydraulic cushion oil cylinder shown in Fig. 4 is located in buffering course；
Fig. 6 is located at the structural representation of buffering end for the hydraulic cushion oil cylinder shown in Fig. 4；
Fig. 7 is the partial enlarged drawing at K in Fig. 6.
Description of reference numerals
1a- piston rods；2a- pistons；3a- sealing rings；4a- cylinder barrels；5a- cushion pins；6a- cushion holes；7a- cylinders
Bottom；8a- rod chambers；9a- rodless cavities；10a- fit clearances；Aa- hydraulic fluid ports；
1- piston rods；2- pistons；3- sealing rings；4- cylinder barrels；5- individual buffer devices；6- check valves；7- cylinders
Bottom；The cavity volumes of 8- second；The cavity volumes of 9- first；10- pressure compensation openings；The hydraulic fluid ports of 11- first；The hydraulic fluid ports of 12- second；13- springs；
14- adjusting screws；A- hydraulic fluid ports；The oil ducts of 51- first；The oil ducts of 52- second；The oil ducts of 53- the 3rd.
Embodiment
Below by drawings and examples, technical scheme is described in further detail.
As shown in Figures 4 to 6, the invention provides a kind of hydraulic cushion oil cylinder, including：Cylinder barrel 4, piston component and
Individual buffer device 5, piston component include the piston rod 1 and piston 2 to interfix, and piston 2 separates the internal cavity of cylinder barrel 4
For the first cavity volume 9 and the second cavity volume 8, for the hydraulic jack shown in Fig. 4, the first cavity volume 9 is rodless cavity, and the second cavity volume 8 is to have
Rod cavity, the first cavity volume 9 are located between piston 2 and the cylinder bottom 7 of cylinder barrel 4, and cylinder bottom 7 is provided with hollow structure, and individual buffer device 5 can be transported
It is located in dynamicly in hollow structure, and pressure balance chamber is formed between the blind end of one end and cylinder bottom 7, in individual buffer device 5
If oil duct connected respectively with the first cavity volume 9, pressure balance chamber and the hydraulic fluid port A that is opened on cylinder barrel 4, the energy of individual buffer device 5
Enough connection sections for changing the first cavity volume 9 and hydraulic fluid port A under the promotion of piston component, with to the hydraulic oil in the first cavity volume 9 from
Hydraulic fluid port A is throttled when flowing out.
Wherein, the purpose that the first cavity volume 9 connects with pressure balance chamber is so that piston component is in contact individual buffer
Before device 5, the pressure only relied in the first cavity volume 9 can not move individual buffer device 5, only the promotion in piston component
It is lower just to move individual buffer device 5, it can so avoid piston component from not moving to specified location also and proceed by section
Stream buffering, while be also avoided that because the pressure of the first cavity volume 9 make it that the speed that individual buffer device 5 moves is different, so as to lead
Cause buffering effect different.
For hydraulic cushion oil cylinder of the prior art, due to the fit clearance 10 between cushion pins 5a and cushion hole 6a compared with
It is small, therefore higher is required to cushion pins 5a and cushion hole 6a axiality, but certain error be present due to manufacturing, assembling, with
And sealing ring 3a is employed between piston 2a and cylinder barrel 4a, piston rod 1a can not be avoided in use by radial load, and
Produce radial error because cushion pins 5a and piston rod 1a are integrated design, thus this partially radially error can be passed to buffering
Between selling 5a and cushion hole 6a, so that hydraulic cylinder may be pulled in the course of the work, glued situation.
And the hydraulic cushion oil cylinder of this embodiment of the invention, contacting travel is carried out to individual buffer device by piston component
Control, enables individual buffer device to change the connection section of the first cavity volume and hydraulic fluid port A under the promotion of piston component, with to the
Hydraulic oil in one cavity volume is throttled during being flowed out from hydraulic fluid port A, so as to realize that the end of cushion cylinder buffers
Function, it can be seen that, core thinking of the invention is to instead of change using change flow area throttling buffering to match somebody with somebody on cushioning principle
Close gap throttling buffering.And for such a hydraulic cushion oil cylinder, piston component is separate with buffer structure, is only connect by end face
Touch, then the processing of cushion cylinder itself and alignment error will not be conducted to buffer structure part, thus to the processing of cushion cylinder
And installation accuracy requires relatively low；And it can be effectively prevented from the prior art between cushion pins and cushion hole due to the original of axiality
Because of the problems such as causing to pull gluing, so as to lift the functional reliability of hydraulic cushion oil cylinder.
In another embodiment of the present invention, pressure balance intracavitary is provided with flexible member, can be reverse in piston component
Reset individual buffer device 5 during motion.When the end of travel that piston component moves to hydraulic cylinder enters row buffering, by bullet
The rigidity of property element is designed the movement velocity that can control individual buffer device 5, so as to realize different buffering effects, separately
When external buffering terminates rear piston component counter motion, flexible member is applied with elastic force to the left to individual buffer device 5, can
Auxiliary individual buffer device 5 smoothly resets.Preferably, flexible member can select spring 13 or shell fragment etc..
In order that individual buffer device 5 rests on fixed position after resetting, can also hold in hollow structure close to first
The side of chamber 9 sets boss, can be carried out when individual buffer device 5 resets spacing.If individual buffer device 5 chooses column
Structure, then the shaft shoulder can be set in the relevant position of column structure, it is spacing to carry out to be resisted against afterwards in place on boss in reset.
In this embodiment, as shown in figure 4, when piston rod 1 is moved right not in contact with individual buffer device 5, i.e., solely
Vertical buffer unit 5, without relative motion, at this moment sets the pressure in the first cavity volume 9 (even if individual buffer device 5 relative to cylinder body 4
The power moved right) it is F1, pressure in pressure balance is strong (even if individual buffer device 5 to the power of left movement) is F2, spring
13 elastic force (even if individual buffer device 5 to the power of left movement) is F3, passes through force analysis and understands F1<F2+F3, then it ensure that
Individual buffer device 5 is inactive state, i.e. spring 13 is uncompressed.As shown in figure 5, when piston rod 1 continues to move right beginning
When contacting individual buffer device 5, i.e., relative to cylinder body 4 relative motion occurs for individual buffer device 5, at this moment adds piston rod again
The power F4 to the right that 1 pair of individual buffer device 5 applies, F1+F4 is understood by force analysis<F2+F3, then individual buffer device 5
Move right, spring 13 is compressed.In this course, the first cavity volume 9 and pressure balance chamber are compressed, its internal hydraulic pressure
Oil will flow out from hydraulic fluid port A, so as to play hydraulic cushion effect.When piston component gradually moves in the opposite direction (in Fig. 4
Left-hand), piston rod 1 is gradually reduced to the power F4 to the right that individual buffer device 5 applies, and spring force F3 will overcome F4 to cause solely
Vertical buffer unit 5 is as piston rod 1 is to left movement, until piston rod 1 departs from individual buffer device 5, then F4 is reduced to 0.
Terminate in hydraulic jack buffering, when piston component needs counter motion, for the prior art hydraulic oil shown in Fig. 3
The scheme of cylinder, HYDRAULIC CONTROL SYSTEM hydraulic oil enter from the hydraulic fluid port Aa of oil cylinder, and hydraulic oil is acted on cushion pins 5a end face, opened
Dynamic pressure is larger, causes system to start impact larger.
And the hydraulic cushion oil cylinder of the present invention in order to reduce counter motion when startup pressure, hydraulic pressure as shown in Figure 6 delays
The structural representation that oil cylinder is located at buffering end is rushed, and the partial enlarged drawing K shown in Fig. 7, the oil duct residing for hydraulic fluid port A are provided with
The collateral branch's oil duct connected with the first cavity volume 9, collateral branch's oil duct is interior to be provided with check valve 6, can realize from hydraulic fluid port A to the first cavity volume 9
Unilaterally connected, i.e. hydraulic oil enter the first cavity volume 9 after the resistance of check valve 6 can only be overcome from hydraulic fluid port A, and in piston component to the right
During motion, check valve 6 is closed, and hydraulic oil can not flow out from the first cavity volume 9 by collateral branch's oil duct from hydraulic fluid port A.Specifically, by this
The track of branch oil duct can be designed according to the special case of cylinder bottom 7 and the setting demand of check valve 6.
In this embodiment, hydraulic oil can open check valve 6 first after hydraulic fluid port A entrance, into the first cavity volume 9, promote
Piston component is to left movement, and because the opening pressure of check valve 6 is smaller, then system pressure is relatively low when starting, when piston component takes off
During from individual buffer device 5, the first cavity volume 9 and hydraulic fluid port A flow area increases to maximum, and now check valve 6 is closed, hydraulic oil
The oil duct set out of individual buffer device 5 is flow to the first cavity volume 9, therefore the compression shock of system is smaller, so that system opens
Dynamic pressure is more steady.
If without check valve 6, hydraulic oil will be from hydraulic fluid port A mouths by the oil duct that sets in individual buffer device 5 to the first cavity volume
9, piston component is promoted to left movement, because the flow area of now the first cavity volume 9 and hydraulic fluid port A is smaller, the pressure of formation is larger,
Therefore system pressure is higher when starting, when piston component departs from individual buffer device 5, the first cavity volume 9 and hydraulic fluid port A flow area
Increase to maximum, do not form throttling, system pressure need to only overcome outer load, and pressure is relatively small, thus on startup, will be formed compared with
High compression shock.
In a specific embodiment, as shown in Figures 4 to 6, the hollow structure being arranged in cylinder bottom 7 is to delay with hydraulic pressure
The poroid cavity that the center line of oil cylinder is coaxially disposed is rushed, individual buffer device 5 is the column structure being adapted with poroid cavity, solely
One end of vertical buffer unit 5 is extend into the first cavity volume 9, pressure balance chamber is formed between the blind end of the other end and cylinder bottom 7, solely
The length that one end of vertical buffer unit 5 is extend into the first cavity volume 9, which determines that hydraulic jack is realized, to be needed to realize pooling feature
Stroke.
Further, partial enlarged drawing K as shown in Figure 7, the oil duct set in individual buffer device 5 include：Radially open up
The first oil duct 51 in one end that individual buffer device 5 is extend into the first cavity volume 9, be radially opened in it is corresponding with hydraulic fluid port A
Second oil duct 52 of position and axial direction are opened in the 3rd oil duct between the first oil duct 51 and the second oil duct 52 and interconnected
53, the first oil duct 51 and the second oil duct 52 form the first hydraulic fluid port 11 and the second hydraulic fluid port 12 on the surface of individual buffer device 5 respectively.
Preferably, can be the from the partial enlarged drawing K shown in Fig. 7 as can be seen that the second hydraulic fluid port 12 is wedge-shaped annular groove
After oil duct residing for two oil duct 52 and hydraulic fluid port A staggers, remain to keep the second hydraulic fluid port 12 to connect with hydraulic fluid port A.The purpose of this design
When mainly considering to be installed to individual buffer device 5 in hollow structure, if opening up common poroid hydraulic fluid port, being difficult will
The poroid hydraulic fluid port is radially aligned with hydraulic fluid port A, and individual buffer device 5 can then be caused in circumference to appoint for the form of annular groove by opening up
The installation of meaning position can ensure that the second hydraulic fluid port 12 connects with hydraulic fluid port A, so as to reduce the difficulty of installation.
In this structure type, as shown in figure 4, when piston component is moved right not in contact with individual buffer device 5, the
One hydraulic fluid port 11 connects with the first cavity volume 9, and the second hydraulic fluid port 12 connects with the oil duct face where hydraulic fluid port A；As shown in figure 5, work as piston
Bar 1, which touches individual buffer device 5, to be continued during moving right, the face that the first hydraulic fluid port 11 connects with the face of the first cavity volume 9
Though product is gradually reduced, throttling action is not played herein, only serves logical oil effect, the second hydraulic fluid port 12 and the connected surface of hydraulic fluid port A faces
Product is also gradually reduced, so that throttling circulation area reduces in real time, and then pooling feature is gradually strengthened, is realized pooling feature
The size of second hydraulic fluid port 12 on corresponding piston rod stroke and individual buffer device 5, determine buffering effect and buffering when
Between.The hydraulic jack of the present invention slows down more steady when moving to end of travel, can avoid outer loading out for its control as far as possible
Now shake.
As the structure of extension, the first oil duct 51 and the second oil duct 52 can be unidirectional with the outer surface of individual buffer device 5
Or two-way insertion；The oil duct set in individual buffer device 5 can be the linear oil duct of segmentation, or segmentation is in other
The oil duct of curve or broken line, or the oil duct of a monoblock type, the first cavity volume 9 is connected with hydraulic fluid port A to can realize.
In order that the first cavity volume 9 connects with pressure balance chamber, can be in the wall between the second oil duct 52 and pressure balance chamber
Pressure compensation opening 10 is opened up on face.In actual design according to the pressure inside hydraulic jack come the logical of design pressure balance pipe 10
Footpath, if the latus rectum of pressure compensation opening 10 is too small, the pressure that the first cavity volume 9 is formed when compressing will be larger, may cause piston group
Part can not move right, then be unfavorable for forming throttling buffering mouth.
In the embodiment for being provided with spring 13, hydraulic cushion oil cylinder also includes adjusting screw 14, and adjusting screw 14 is set
In the blind end of cylinder bottom 7 position corresponding with spring 13, the pretightning force size of spring 13 can be adjusted.Opened up in cylinder bottom 7 logical
Hole can be in order to process, and individual buffer device 5 convenient for assembly.
Further, individual buffer device 5 is provided with recess close to the side of pressure balance chamber, and flexible member is spring
13, the both ends of spring 13 act against the bottom of recess and the blind end of cylinder bottom 7 respectively, thus can realize axial direction to spring 13
It is spacing with radial direction.
In another embodiment of the present invention, in order to reach preferably energy-conservation buffering effect, buffering is also considered comprehensively
Sealing property in hydraulic cylinder between all parts.Sealing ring 3 is additionally provided with buffering hydraulic cylinder interior, sealing ring 3 is arranged on solely
It is vertical between buffer unit 5 and the mating surface of hollow structure, hydraulic oil in the first cavity volume 9 can be prevented from individual buffer device 5
Flowed out between the mating surface of hollow structure, so as to which the hydraulic oil ensured in the first cavity volume 9 can only be by individual buffer device 5
If oil duct from hydraulic fluid port A flow out.
In addition, it is other the part of relative motion be present between, such as between cylinder barrel 4 and piston 2, and piston rod 1 with
Sealing ring 3 also is provided between piston 2.Can in order to ensure steadiness and reliability that piston rod 1 is connected with piston 2, between them
In the hole for passing through the shaft shoulder set on piston rod 1 and piston 2 with the embodiment using a variety of connected modes, such as shown in Fig. 4
The boss of setting carries out axially position, then is fixed by jackscrew come axial limiting, can also use welding or pass through piston rod 1
The external screw thread of upper setting screws fixed mode with the internal thread set on the hole of piston 2.
It is corresponding independent below in conjunction with Fig. 4 to Fig. 6 after the basic structure of individual buffer hydraulic jack of the present invention is described
Buffering hydraulic oil cylinder is in the schematic diagram of different conditions, and its operation principle is described in detail.
As shown in figure 4, the oil-feed of the second cavity volume of HYDRAULIC CONTROL SYSTEM 8, promotes piston component to move right, now piston rod 1
Not in contact with individual buffer device 5, then contacting travel is zero, and the hydraulic oil in the first cavity volume 9 is through first in individual buffer device 5
Hydraulic fluid port 11 enters, then enters pressure balance chamber through pressure compensation opening 10, only in the presence of spring 13 from hydrostatic stress
The vertical holding position of buffer unit 5 is constant, therefore individual buffer device 5 keeps constant with the flow area that cylinder bottom 7 is formed, then first holds
Hydraulic oil in chamber 9 is after the first hydraulic fluid port 11 in individual buffer device 5 enters, then passes through its 12 normal oil return of the second hydraulic fluid port.
In this case, hydraulic jack normal work, no pooling feature.
As shown in figure 5, the second cavity volume of HYDRAULIC CONTROL SYSTEM 8 continues oil-feed, piston component is promoted to continue to move to the right, piston
Bar 1 starts to contact individual buffer device 5, drives individual buffer device 5 to overcome the resistance of spring 13 to move right together, then independent
Buffer unit 5 reduces with the flow area that cylinder bottom 7 is formed, and throttling passage is formed, so as to realize pooling feature, with piston component
Continue to move right, the flow area that individual buffer device 5 is formed with cylinder bottom 7 continues to reduce, and throttling back pressure will increase, buffering effect
Fruit strengthens, until hydraulic jack moves right the end pooling feature for terminal, realizing cushion cylinder.
As shown in fig. 6, when piston component arrival end of travel need to be to left movement, HYDRAULIC CONTROL SYSTEM hydraulic fluid port A oil-feeds, compel
After opening check valve, hydraulic oil is directly entered the first cavity volume 9, so as to promote piston component to start pressure to left movement, system
Steadily, after piston component and individual buffer device 5 disengage, check valve 6 is closed, from the hydraulic oil that hydraulic fluid port A enters from only
The oil duct set in vertical buffer unit 5 enters the first cavity volume 9.
In addition, present invention also offers a kind of crane, including the buffering hydraulic oil cylinder described in above-described embodiment.Crane
The various actions carried out are generally required by hydraulic actuator (such as hydraulic cylinder) to control, if hydraulic actuator institute band
It is outer load it is larger when, speed can be preferably reduced when moving to end of travel, to reduce the pressure inside hydraulic actuator
Impact, it can so cause complete machine more steady safety when execution acts.
For example, for front-handling mobile crane, needed in its work by suspender in front handling container
The object larger etc. weight, within beginning a period of time of handling process, in order to improve operating efficiency, generally require hydraulic cylinder with
Faster speed motion, and when moving to the end of travel of hydraulic jack, then need to reduce movement velocity, to reduce piston group
Part reaches compression shock caused by hydraulic jack end, so that the process of handling container is more steady, so as to improve
The life-span of heavy-duty machine.Except for front-handling mobile crane, hydraulic jack of the invention, which can also be used for other all kinds, to be needed to hold
In the crane of row buffering function, also it can be widely used in other types of engineering machinery certainly.
Replaced because the hydraulic cushion oil cylinder of the embodiment of the present invention applies change flow area throttling buffering on cushioning principle
Contacting travel control is carried out to individual buffer device for change fit clearance throttling buffering, and by piston component, with regard to that can make solely
Vertical buffer unit can realize the end pooling feature of cushion cylinder under the promotion of piston component, and this improvement can reduce pair
The processing of cushion cylinder and installation accuracy requirement, and the functional reliability of energy Promoting Layered Buffer oil cylinder.Thus employ such a liquid
The crane of pressure cushion cylinder also possesses higher reliability at work, and due to the hydraulic cushion oil cylinder start pressure compared with
It is small, compression shock can be reduced, so that it may so that crane avoids acutely shake and impact when being switched to backhaul action as far as possible, these
Advantage can further improve safe class when crane performs operation, and simultaneous buffering oil cylinder, which is less likely to be damaged, to be prolonged
Long maintenance intervals, so as to reduce maintenance cost.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among the claimed technical scheme scope of the present invention.
Claims (10)
- A kind of 1. hydraulic cushion oil cylinder, it is characterised in that including：Cylinder barrel (4), piston component and individual buffer device (5), it is described The first cavity volume (9) is formed between piston component and the cylinder bottom (7) of the cylinder barrel (4), the cylinder bottom (7) is provided with hollow structure, institute Individual buffer device (5) is stated movingly to be located in the hollow structure, and between the blind end of one end and the cylinder bottom (7) Pressure balance chamber is formed, the oil duct set in the individual buffer device (5) is put down with first cavity volume (9), the pressure respectively Weighing apparatus chamber connects with the hydraulic fluid port (A) being opened on the cylinder barrel (4), and the individual buffer device (5) can be in the piston component Promotion under change the connection section of first cavity volume (9) and the hydraulic fluid port (A), with to the liquid in first cavity volume (9) Force feed is throttled when being flowed out from the hydraulic fluid port (A)；The oil duct set in the individual buffer device (5) includes：Radially be opened in the individual buffer device (5) extend into it is described First oil duct (51) of one end in the first cavity volume (9), the second oil for being radially opened in the position corresponding with the hydraulic fluid port (A) Road (52) and the 3rd oil for being axially opened between first oil duct (51) and second oil duct (52) and being interconnected Road (53), first oil duct (51) and second oil duct (52) are formed on the surface of the individual buffer device (5) respectively First hydraulic fluid port (11) and the second hydraulic fluid port (12)；When the piston component is not in contact with individual buffer device (5), second hydraulic fluid port (12) and oil where hydraulic fluid port (A) The connection of road face, when the piston component is touched during the individual buffer device (5) continues motion, second oil Mouth (12) and the connection area of hydraulic fluid port (A) face are gradually reduced, so that throttling flow area reduces in real time；Second hydraulic fluid port (12) is wedge-shaped annular groove, can be in the oil duct residing for second oil duct (52) and the hydraulic fluid port (A) After staggering, remain to keep second hydraulic fluid port (12) to connect with the hydraulic fluid port (A).
- 2. hydraulic cushion oil cylinder according to claim 1, it is characterised in that the pressure balance intracavitary is provided with elasticity member Part, reset in the piston component counter motion individual buffer device (5).
- 3. hydraulic cushion oil cylinder according to claim 1, it is characterised in that the oil duct residing for the hydraulic fluid port (A) is provided with The collateral branch's oil duct connected with first cavity volume (9), collateral branch's oil duct is interior to be provided with check valve (6), can realize from the oil Mouth (A) arrives the unilaterally connected of first cavity volume (9).
- 4. according to any described hydraulic cushion oil cylinder of claims 1 to 3, it is characterised in that the hollow structure be with it is described The poroid cavity that the center line of hydraulic cushion oil cylinder is coaxially disposed, the individual buffer device (5) are and the poroid cavity phase The column structure of adaptation, one end of the individual buffer device (5) are extend into first cavity volume (9), the other end with it is described The pressure balance chamber is formed between the blind end of cylinder bottom (7).
- 5. hydraulic cushion oil cylinder according to claim 1, it is characterised in that second oil duct (52) is put down with the pressure Pressure compensation opening (10) is offered between weighing apparatus chamber, first cavity volume (9) can be made to be interconnected with the pressure balance chamber.
- 6. hydraulic cushion oil cylinder according to claim 2, it is characterised in that also including adjusting screw (14), the regulation Screw (14) is arranged on the blind end position corresponding with the flexible member of the cylinder bottom (7), can adjust the elasticity The pretightning force size of element.
- 7. hydraulic cushion oil cylinder according to claim 2, it is characterised in that the individual buffer device (5) is close to described The side of pressure balance chamber is provided with recess, and the flexible member is spring (13), and the both ends of the spring (13) lean respectively In the bottom in the female portion and the blind end of the cylinder bottom (7).
- 8. hydraulic cushion oil cylinder according to claim 2, it is characterised in that the hollow structure is close to first cavity volume (9) side is provided with boss, can be carried out when the individual buffer device (5) resets spacing.
- 9. hydraulic cushion oil cylinder according to claim 1, it is characterised in that also including sealing ring (3), the sealing ring (3) it is arranged between the individual buffer device (5) and the mating surface of the hollow structure.
- 10. a kind of crane, it is characterised in that including any described hydraulic cushion oil cylinder of claim 1~9.
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| CN201510551571.9A CN105179361B (en) | 2015-09-01 | 2015-09-01 | A kind of hydraulic cushion oil cylinder and crane |
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| CN201510551571.9A CN105179361B (en) | 2015-09-01 | 2015-09-01 | A kind of hydraulic cushion oil cylinder and crane |
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| CN105179361A CN105179361A (en) | 2015-12-23 |
| CN105179361B true CN105179361B (en) | 2017-11-24 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106907369B (en) * | 2017-04-19 | 2019-03-08 | 雷沃重工股份有限公司 | Agricultural machinery lift cylinder |
| CN108757630B (en) * | 2018-06-19 | 2019-11-12 | 中航飞机起落架有限责任公司 | A kind of quick-release pressurized strut |
| CN109707689B (en) * | 2018-12-29 | 2019-10-29 | 燕山大学 | Variable damper valve |
| CN113085114B (en) * | 2021-04-06 | 2022-06-28 | 余姚市鹰图机械设备有限公司 | Assembly process of double-oil-cylinder pushing mechanism for injection molding machine |
| CN114593109A (en) * | 2022-02-15 | 2022-06-07 | 湖南中联重科智能高空作业机械有限公司 | Oil cylinder buffer valve and hydraulic oil cylinder |
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| US2408338A (en) * | 1944-06-13 | 1946-09-24 | Cons Car Heating Co Inc | Hydraulic device |
| SU413285A1 (en) * | 1972-01-24 | 1974-01-30 | ||
| US4397218A (en) * | 1980-12-23 | 1983-08-09 | Allis-Chalmers Corporation | Cushion stop for hydraulic cylinder |
| US5309817A (en) * | 1993-03-05 | 1994-05-10 | Sims James O | Linear brake for fluid actuator |
| CN102155468A (en) * | 2011-04-27 | 2011-08-17 | 三一重工股份有限公司 | Hydraulic cylinder and cushioning device of hydraulic cylinder |
| CN204553416U (en) * | 2015-03-05 | 2015-08-12 | 乌本纳数控设备(上海)有限公司 | Non-locating formula hydraulic throttle damping mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202176579U (en) * | 2011-08-10 | 2012-03-28 | 河北新兴铸管有限公司 | Oil cylinder end buffering device |
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- 2015-09-01 CN CN201510551571.9A patent/CN105179361B/en active Active
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|---|---|---|---|---|
| US2408338A (en) * | 1944-06-13 | 1946-09-24 | Cons Car Heating Co Inc | Hydraulic device |
| SU413285A1 (en) * | 1972-01-24 | 1974-01-30 | ||
| US4397218A (en) * | 1980-12-23 | 1983-08-09 | Allis-Chalmers Corporation | Cushion stop for hydraulic cylinder |
| US5309817A (en) * | 1993-03-05 | 1994-05-10 | Sims James O | Linear brake for fluid actuator |
| CN102155468A (en) * | 2011-04-27 | 2011-08-17 | 三一重工股份有限公司 | Hydraulic cylinder and cushioning device of hydraulic cylinder |
| CN204553416U (en) * | 2015-03-05 | 2015-08-12 | 乌本纳数控设备(上海)有限公司 | Non-locating formula hydraulic throttle damping mechanism |
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| CN105179361A (en) | 2015-12-23 |
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