CN105179361A - Hydraulic buffer oil cylinder and crane - Google Patents
Hydraulic buffer oil cylinder and crane Download PDFInfo
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- CN105179361A CN105179361A CN201510551571.9A CN201510551571A CN105179361A CN 105179361 A CN105179361 A CN 105179361A CN 201510551571 A CN201510551571 A CN 201510551571A CN 105179361 A CN105179361 A CN 105179361A
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- 239000003921 oil Substances 0.000 claims abstract description 119
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims description 74
- 230000033001 locomotion Effects 0.000 claims description 20
- 230000033558 biomineral tissue development Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 230000003139 buffering effect Effects 0.000 description 19
- 238000011176 pooling Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000035939 shock Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 210000000664 rectum Anatomy 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a hydraulic buffer oil cylinder and a crane. The hydraulic buffer oil cylinder comprises a cylinder barrel (4), a piston assembly and an independent buffer device (5), wherein a first accommodating cavity (9) is formed between the piston assembly and a cylinder bottom (7) of the cylinder barrel(4); the cylinder bottom (7) is provided with a hollow structure; the independent buffer device (5) is movably arranged in the hollow structure in a penetrating manner; a pressure balance cavity is formed between one end of the independent buffer device (5) and a closed end of the cylinder bottom (7); an oil duct arranged in the independent buffer device (5) communicates with the first accommodating cavity (9), the pressure balance cavity and an oil port(A) formed in the cylinder barrel (4); the independent buffer device (5) can be pushed by the piston assembly to change a communicating section of the first accommodating cavity (9) and the oil port (A), so that hydraulic oil in the first accommodating cavity (9) can perform reduce expenditure when the hydraulic oil flows out from the oil port (A). The hydraulic buffer oil cylinder disclosed by the invention can improve the reliability while in use, and prevent the hydraulic oil cylinder from being damaged as possible.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, particularly relate to a kind of hydraulic cushion oil cylinder and hoist.
Background technique
Front-handling mobile crane be contained on tire chassis voluntarily with telescopic jib, at the hoist of dead ahead handling shipping container, along with the development of front-handling mobile crane suspender, require more and more higher to the functional reliability of its cushion cylinder.Wherein, cushion cylinder is that its inside have employed damping device, can realize the hydraulic jack successively decreased in stroke terminal velocity.
Tradition front-handling mobile crane suspender cushion cylinder adopts internal damping control mode, its structure and working procedure are as shown in FIG. 1 to 3, see Fig. 1, by HYDRAULIC CONTROL SYSTEM rod chamber 8a oil-feed, promote piston rod 1a to move right, if the cushion pins 5a of piston rod 1a end does not insert the cushion hole 6a on cylinder bottom 7a, the fluid in rodless cavity 9a is through cushion hole 6a oil return, then piston rod 1a moves right at a high speed.HYDRAULIC CONTROL SYSTEM rod chamber 8a continues oil-feed, piston rod 1a continues to move right, see Fig. 2 and Fig. 3, cushion pins 5a on piston rod 1a starts the cushion hole 6a inserted on cylinder bottom 7a, define matching gap 10a between the two, create return oil pressure, the fluid at this moment in rodless cavity 9a, through matching gap 10a oil return, achieves throttling buffering.Along with piston rod 1a continues to move right, the matching gap 10a of cushion pins 5a and cushion hole 6a is elongated, and throttling back pressure increases, and cushioning effect strengthens, until piston rod 1a moves right to terminal, achieves the end pooling feature of cushion cylinder.
This kind of hydraulic cushion cylinder structure is simple, and throttling buffering successful, but in order to realize good cushioning effect, its matching gap 10a is less, therefore require higher to the coaxality of cushion pins 5a and cushion hole 6a, certain error is there is owing to manufacturing and assembling, and have employed seal ring 3a between piston 2a and cylinder barrel 4a, piston rod 1a in use cannot be avoided by radial force, there is certain radial missing, the situation of then may pull between cushion pins 5a and cushion hole 6a, gluing together, will damage hydraulic jack time serious.
Summary of the invention
The object of the invention is to propose a kind of hydraulic cushion oil cylinder and hoist, reliability during hydraulic cushion cylinder efficient can be improved.
For achieving the above object, one aspect of the present invention provides a kind of hydraulic cushion oil cylinder, comprise: cylinder barrel 4, piston assembly and individual buffer device 5, the first cavity volume 9 is formed between the cylinder bottom 7 of piston assembly and cylinder barrel 4, cylinder bottom 7 is provided with hollow structure, individual buffer device 5 is located in hollow structure movingly, and mineralization pressure counter balance pocket between the closed end of one end and cylinder bottom 7, the oil duct established in individual buffer device 5 respectively with the first cavity volume 9, pressure balance chamber is communicated with the hydraulic fluid port A be opened on cylinder barrel 4, what individual buffer device 5 can change the first cavity volume 9 and hydraulic fluid port A under the promotion of piston assembly is communicated with cross section, to carry out throttling to the hydraulic oil in the first cavity volume 9 when hydraulic fluid port A flows out.
Further, in pressure balance chamber, be provided with elastic element, individual buffer device 5 can be resetted when piston assembly reversing motion.
Further, the oil duct residing for hydraulic fluid port A is provided with the collateral branch's oil duct be communicated with the first cavity volume 9, is provided with one-way valve 6 in collateral branch's oil duct, can realize the unilaterally connected from hydraulic fluid port A to the first cavity volume 9.
Further, hollow structure is the poroid cavity coaxially arranged with the center line of hydraulic cushion oil cylinder, individual buffer device 5 is the column structure suitable with poroid cavity, one end of individual buffer device 5 extend in the first cavity volume 9, mineralization pressure counter balance pocket between the closed end of the other end and cylinder bottom 7.
Further, the oil duct established in individual buffer device 5 comprises: radial direction is opened in individual buffer device 5 extend into first oil duct 51 of the one end in the first cavity volume 9, radial direction is opened in the position corresponding with hydraulic fluid port A the second oil duct 52 and is axially opened between the first oil duct 51 and the second oil duct 52 and the 3rd oil duct 53, first oil duct 51 be interconnected and the second oil duct 52 form the first hydraulic fluid port 11 and the second hydraulic fluid port 12 respectively on the surface of individual buffer device 5.
Further, between the second oil duct 52 and pressure balance chamber, offer pressure compensation opening 10, the first cavity volume 9 can be made to be interconnected with pressure balance chamber.
Further, the second hydraulic fluid port 12 is wedge shape annular groove, can, after the second oil duct 52 and the oil duct residing for hydraulic fluid port A stagger, the second hydraulic fluid port 12 still can be kept to be communicated with hydraulic fluid port A.
Further, also comprise adjusting screw 14, adjusting screw 14 is arranged on the closed end of cylinder bottom 7 position corresponding with elastic element, can the pretightening force size of adjustable elastic element.
Further, individual buffer device 5 is provided with reentrant part near the side of pressure balance chamber, and elastic element is spring 13, and the two ends of spring 13 lean the closed end in the bottom of reentrant part and cylinder bottom 7 respectively.
Further, hollow structure is provided with boss near the side of the first cavity volume 9, can carry out spacing when individual buffer device 5 resets.
Further, also comprise seal ring 3, seal ring 3 is arranged between individual buffer device 5 and the fitting surface of hollow structure.
For achieving the above object, the present invention provides a kind of hoist on the other hand, comprises the hydraulic cushion oil cylinder described in above-described embodiment.
Based on technique scheme, the hydraulic cushion oil cylinder of the embodiment of the present invention, by piston assembly, contacting travel control is carried out to individual buffer device, what enable individual buffer device under the promotion of piston assembly, change the first cavity volume and hydraulic fluid port A is communicated with cross section, to carry out throttling to the hydraulic oil in the first cavity volume in the process flowed out from hydraulic fluid port A, thus the end pooling feature of cushion cylinder can be realized.For this kind of hydraulic cushion oil cylinder, the processing of cushion cylinder self and alignment error can not conduct to buffer structure part, thus require lower to the processing of cushion cylinder and installation precision; And can effectively avoid the reason due to coaxality between cushion pins and cushion hole in prior art to cause pulling the problems such as gummed, thus the reliability of Promoting Layered Buffer cylinder efficient.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining 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 prior art;
Fig. 2 is arranged in the structural representation of buffering course for the hydraulic cushion oil cylinder shown in Fig. 1;
Fig. 3 is positioned 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 arranged in the structural representation of buffering course for the hydraulic cushion oil cylinder shown in Fig. 4;
Fig. 6 is positioned 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 place in Fig. 6.
Description of reference numerals
1a-piston rod; 2a-piston; 3a-seal ring; 4a-cylinder barrel; 5a-cushion pins; 6a-cushion hole; 7a-cylinder bottom; 8a-rod chamber; 9a-rodless cavity; 10a-matching gap; Aa-hydraulic fluid port;
1-piston rod; 2-piston; 3-seal ring; 4-cylinder barrel; 5-individual buffer device; 6-one-way valve; 7-cylinder bottom; 8-second cavity volume; 9-first cavity volume; 10-pressure compensation opening; 11-first hydraulic fluid port; 12-second hydraulic fluid port; 13-spring; 14-adjusting screw; A-hydraulic fluid port; 51-first oil duct; 52-second oil duct; 53-the 3rd oil duct.
Embodiment
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
As shown in Figures 4 to 6, the invention provides a kind of hydraulic cushion oil cylinder, comprise: cylinder barrel 4, piston assembly, and individual buffer device 5, piston assembly comprises the piston rod 1 and piston 2 that interfix, the internal cavity of cylinder barrel 4 is divided into the first cavity volume 9 and the second cavity volume 8 by piston 2, for the hydraulic jack shown in Fig. 4, first cavity volume 9 is rodless cavity, second cavity volume 8 is rod chamber, first cavity volume 9 is between piston 2 and the cylinder bottom 7 of cylinder barrel 4, cylinder bottom 7 is provided with hollow structure, individual buffer device 5 is located in hollow structure movingly, and mineralization pressure counter balance pocket between the closed end of one end and cylinder bottom 7, the oil duct established in individual buffer device 5 respectively with the first cavity volume 9, pressure balance chamber is communicated with the hydraulic fluid port A be opened on cylinder barrel 4, what individual buffer device 5 can change the first cavity volume 9 and hydraulic fluid port A under the promotion of piston assembly is communicated with cross section, to carry out throttling to the hydraulic oil in the first cavity volume 9 when hydraulic fluid port A flows out.
Wherein, the object that first cavity volume 9 is communicated with pressure balance chamber is, make piston assembly before contact individual buffer device 5, only rely on the pressure in the first cavity volume 9 that individual buffer device 5 can not be made to move, under the promotion of piston assembly, individual buffer device 5 only just can be made to move, piston assembly can be avoided so also not move to specified position namely start to carry out throttling buffering, the speed simultaneously also avoiding the pressure due to the first cavity volume 9 that individual buffer device 5 is moved is different, thus causes cushioning effect different.
For hydraulic cushion oil cylinder of the prior art, because the matching gap 10 between cushion pins 5a and cushion hole 6a is less, therefore require higher to the coaxality of cushion pins 5a and cushion hole 6a, but owing to manufacturing, there is certain error in assembling, and have employed seal ring 3a between piston 2a and cylinder barrel 4a, piston rod 1a in use cannot be avoided to be subject to radial force, and produce radial error, because cushion pins 5a and piston rod 1a is integrated design, thus this part radial error can pass to between cushion pins 5a and cushion hole 6a, thus oil hydraulic cylinder may be pulled in the course of the work, the situation of gummed.
And the hydraulic cushion oil cylinder of this embodiment of the invention, by piston assembly, contacting travel control is carried out to individual buffer device, what enable individual buffer device under the promotion of piston assembly, change the first cavity volume and hydraulic fluid port A is communicated with cross section, to carry out throttling to the hydraulic oil in the first cavity volume in the process flowed out from hydraulic fluid port A, thus the end pooling feature of cushion cylinder can be realized, as can be seen here, on cushioning principle, core thinking of the present invention is that the flexible flow area throttling buffering of application instead of change matching gap throttling buffering.And for this kind of hydraulic cushion oil cylinder, piston assembly and buffer structure separate, only by end contact, then the processing of cushion cylinder self and alignment error can not conduct to buffer structure part, thus require lower to the processing of cushion cylinder and installation precision; And can effectively avoid the reason due to coaxality between cushion pins and cushion hole in prior art to cause pulling the problems such as gummed, thus promote the functional reliability of hydraulic cushion oil cylinder.
In another embodiment of the present invention, in pressure balance chamber, be provided with elastic element, individual buffer device 5 can be resetted when piston assembly reversing motion.When the end of travel that piston assembly moves to oil hydraulic cylinder cushions, by carrying out the rigidity of elastic element designing the movement velocity that can control individual buffer device 5, thus realize different cushioning effects, in addition when cushioning end back piston assembly reversing motion, elastic element is applied with elastic force left to individual buffer device 5, and individual buffer device 5 can be assisted to reset smoothly.Preferably, elastic element can select spring 13 or shell fragment etc.
Resting on fixing position after resetting to make individual buffer device 5, at hollow structure, boss can also be set near the side of the first cavity volume 9, can carry 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, spacing to carry out to be resisted against after reset puts in place on boss.
In this embodiment, as shown in Figure 4, when piston rod 1 move right do not contact individual buffer device 5 time, namely individual buffer device 5 relative to cylinder body 4 without relative movement, at this moment setting pressure in the first cavity volume 9 (even if individual buffer device 5 move right power) is F1, pressure (even if individual buffer device 5 is to power of left movement) in pressure balance is strong is F2, the elastic force (even if individual buffer device 5 is to power of left movement) of spring 13 is F3, by the known F1<F2+F3 of force analysis, then ensure that individual buffer device 5 is for state of rest, namely spring 13 is not compressed.As shown in Figure 5, when piston rod 1 continue to move right start to contact individual buffer device 5 time, namely there is relative movement relative to cylinder body 4 in individual buffer device 5, at this moment the power F4 to the right that piston rod 1 pair of individual buffer device 5 applies is turn increased, by the known F1+F4<F2+F3 of force analysis, then individual buffer device 5 moves right, and spring 13 is compressed.In this course, the first cavity volume 9 and pressure balance chamber are all compressed, and the hydraulic oil of its inside will flow out from hydraulic fluid port A, thus plays hydraulic cushion effect.When piston assembly moves in the opposite direction gradually (left-hand in Fig. 4), the power F4 to the right that piston rod 1 pair of individual buffer device 5 applies reduces gradually, spring force F3 will overcome F4 and make individual buffer device 5 along with piston rod 1 is to left movement, until piston rod 1 departs from individual buffer device 5, then F4 is reduced to 0.
Terminate, when piston assembly needs reversing motion, for the scheme of the prior art hydraulic jack shown in Fig. 3 in hydraulic jack buffering, HYDRAULIC CONTROL SYSTEM hydraulic oil enters from the hydraulic fluid port Aa of oil cylinder, hydraulic oil acts on the end face of cushion pins 5a, and breakout pressure is comparatively large, causes system to start impact larger.
And hydraulic cushion oil cylinder of the present invention is in order to reduce breakout pressure during reversing motion, hydraulic cushion oil cylinder is as shown in Figure 6 positioned at the structural representation of buffering end, and the partial enlarged drawing K shown in Fig. 7, oil duct residing for hydraulic fluid port A is provided with the collateral branch's oil duct be communicated with the first cavity volume 9, one-way valve 6 is provided with in collateral branch's oil duct, the unilaterally connected from hydraulic fluid port A to the first cavity volume 9 can be realized, namely hydraulic oil can only enter the first cavity volume 9 after hydraulic fluid port A overcomes the resistance of one-way valve 6, and when piston assembly moves right, one-way valve 6 is closed, hydraulic oil cannot flow out from hydraulic fluid port A from the first cavity volume 9 through this collateral branch's oil duct.Particularly, the track of this collateral branch's oil duct can design according to the demand that arranges of the special case of cylinder bottom 7 and one-way valve 6.
In this embodiment, after hydraulic oil enters from hydraulic fluid port A, first one-way valve 6 can be opened, enter the first cavity volume 9, promote piston assembly to left movement, due to one-way valve 6 to open pressure less, when then starting, system pressure is lower, when piston assembly departs from individual buffer device 5, first cavity volume 9 is increased to maximum with the flow area of hydraulic fluid port A, and now one-way valve 6 is closed, and the oil duct established in individual buffer device 5 is flow to the first cavity volume 9 by hydraulic oil, therefore the compression shock of system is less, thus make the breakout pressure of system comparatively steady.
If without one-way valve 6, oil duct to the first cavity volume 9 that hydraulic oil will be established in individual buffer device 5 from hydraulic fluid port A mouth, promote piston assembly to left movement, because now the first cavity volume 9 is less with the flow area of hydraulic fluid port A, the pressure formed is larger, therefore system pressure is higher when starting, when piston assembly departs from individual buffer device 5, first cavity volume 9 increases to maximum with the flow area of hydraulic fluid port A, do not form throttling, system pressure only need overcome outer load, and pressure is relatively little, thus, when starting, higher compression shock will be formed.
In a specific embodiment, as shown in Figures 4 to 6, the hollow structure be arranged in cylinder bottom 7 is the poroid cavity coaxially arranged with the center line of hydraulic cushion oil cylinder, individual buffer device 5 is the column structure suitable with poroid cavity, one end of individual buffer device 5 extend in the first cavity volume 9, mineralization pressure counter balance pocket between the closed end of the other end and cylinder bottom 7, one end length extend in the first cavity volume 9 of individual buffer device 5 determines the stroke that hydraulic jack realizes needing to realize pooling feature.
Further, partial enlarged drawing K as shown in Figure 7, the oil duct established in individual buffer device 5 comprises: radial direction is opened in individual buffer device 5 extend into first oil duct 51 of the one end in the first cavity volume 9, radial direction is opened in the position corresponding with hydraulic fluid port A the second oil duct 52 and is axially opened between the first oil duct 51 and the second oil duct 52 and the 3rd oil duct 53, first oil duct 51 be interconnected and the second oil duct 52 form the first hydraulic fluid port 11 and the second hydraulic fluid port 12 respectively on the surface of individual buffer device 5.
Preferably, as can be seen from the partial enlarged drawing K shown in Fig. 7, the second hydraulic fluid port 12 is wedge shape annular groove, can, after the second oil duct 52 and the oil duct residing for hydraulic fluid port A stagger, the second hydraulic fluid port 12 still can be kept to be communicated with hydraulic fluid port A.When the object of this design is mainly considered and is installed in hollow structure by individual buffer device 5, if offer common poroid hydraulic fluid port, this poroid hydraulic fluid port and hydraulic fluid port A radial direction is then difficult to align, the form offered as annular groove then can make individual buffer device 5 can ensure that the second hydraulic fluid port 12 is communicated with hydraulic fluid port A in circumference with arbitrary position installation, thus reduce the difficulty of installation.
In this structural type, as shown in Figure 4, when piston assembly move right do not contact individual buffer device 5 time, the first hydraulic fluid port 11 is communicated with the first cavity volume 9, and the oil duct at the second hydraulic fluid port 12 and hydraulic fluid port A place is just to being communicated with; As shown in Figure 5, when piston rod 1 touches in the process that individual buffer device 5 continues to move right, though the first hydraulic fluid port 11 just reduces the area be communicated with gradually with the first cavity volume 9, but do not play throttling action herein, only play logical oil effect, second hydraulic fluid port 12 the be communicated with area just right with hydraulic fluid port A also reduces gradually, thus throttling circulation area is reduced in real time, and then pooling feature is strengthened gradually, realize the size of the second hydraulic fluid port 12 on piston rod stroke corresponding to pooling feature and individual buffer device 5, determine the time of cushioning effect and buffering.Hydraulic jack of the present invention slows down more steady when moving to end of travel, shake appears in the outer load that can as far as possible avoid it to control.
As the structure of expansion, the first oil duct 51 and the second oil duct 52 can be unidirectional or two-way through with the outer surface of individual buffer device 5; The oil duct established in individual buffer device 5 can be the oil duct linearly of segmentation, or the oil duct in other curve or broken line of segmentation, or an all-in-one-piece oil duct, to wanting to realize the first cavity volume 9 to be communicated with hydraulic fluid port A.
In order to make the first cavity volume 9 be communicated with pressure balance chamber, the wall between the second oil duct 52 and pressure balance chamber can offer pressure compensation opening 10.Carry out the latus rectum of design pressure equalizing orifice 10 according to the pressure of hydraulic jack inside when actual design, if the latus rectum of pressure compensation opening 10 is too little, the pressure formed when first cavity volume 9 compresses will be comparatively large, and piston assembly may be caused to move right, be then unfavorable for forming throttling buffering mouth.
In the embodiment being provided with spring 13, hydraulic cushion oil cylinder also comprises adjusting screw 14, and adjusting screw 14 is arranged on the closed end of cylinder bottom 7 position corresponding with spring 13, can the pretightening force size of Regulation spring 13.Offering through hole at cylinder bottom 7 can so that processing, and individual buffer device 5 convenient for assembly.
Further, individual buffer device 5 is provided with reentrant part near the side of pressure balance chamber, and elastic element is spring 13, and the two ends of spring 13 lean the closed end in the bottom of reentrant part and cylinder bottom 7 respectively, so just can realize axis to spring 13 and radial direction is spacing.
In another embodiment of the present invention, in order to reach better energy-conservation cushioning effect, also consider the sealability in buffering hydraulic cylinder between all parts comprehensively.Seal ring 3 is also provided with at buffering hydraulic cylinder interior, seal ring 3 is arranged between individual buffer device 5 and the fitting surface of hollow structure, can prevent the hydraulic oil in the first cavity volume 9 from flowing out between individual buffer device 5 and the fitting surface of hollow structure, thus ensure that the hydraulic oil in the first cavity volume 9 can only be flowed out from hydraulic fluid port A by the oil duct established in individual buffer device 5.
In addition, between the parts that other exists relative movement, such as, between cylinder barrel 4 and piston 2, and seal ring 3 is also provided with between piston rod 1 and piston 2.In order to ensure the steadiness that piston rod 1 is connected with piston 2 and reliability, multiple Placement can be adopted between them, embodiment such as shown in Fig. 4 carries out axially locating by the boss arranged in the shaft shoulder of setting on piston rod 1 and the hole of piston 2, carry out axial limiting by jackscrew again to fix, welding can also be adopted or screw fixing mode by the internal thread that the outside thread of setting on piston rod 1 and the hole of piston 2 are arranged.
After the basic structure describing individual buffer hydraulic jack of the present invention, be in the schematic diagram of different conditions below in conjunction with the corresponding individual buffer hydraulic jack of Fig. 4 to Fig. 6, its working principle is described in detail.
As shown in Figure 4, the oil-feed of HYDRAULIC CONTROL SYSTEM second cavity volume 8, promotion piston assembly moves right, now piston rod 1 does not contact individual buffer device 5, then contacting travel is zero, first hydraulic fluid port 11 of hydraulic oil in first cavity volume 9 in individual buffer device 5 enters, pressure balance chamber is entered again through pressure compensation opening 10, from hydrostatic stressed, under the effect of spring 13, individual buffer device 5 holding position is constant, therefore the flow area that individual buffer device 5 and cylinder bottom 7 are formed remains unchanged, hydraulic oil then in the first cavity volume 9 is from after the first hydraulic fluid port 11 individual buffer device 5 enters, again by the normal oil return of its second hydraulic fluid port 12.In this case, hydraulic jack normally works, without pooling feature.
As shown in Figure 5, HYDRAULIC CONTROL SYSTEM second cavity volume 8 continues oil-feed, promote piston assembly and continue motion to the right, piston rod 1 starts to contact individual buffer device 5, the resistance driving individual buffer device 5 to overcome spring 13 moves right together, the flow area that then individual buffer device 5 and cylinder bottom 7 are formed reduces, form throttling passage, thus realize pooling feature, along with piston assembly continues to move right, the flow area that individual buffer device 5 and cylinder bottom 7 are formed continues to reduce, throttling back pressure will increase, cushioning effect strengthens, until hydraulic jack moves right to terminal, achieve the end pooling feature of cushion cylinder.
As shown in Figure 6, when piston assembly arrive end of travel need to left movement time, HYDRAULIC CONTROL SYSTEM hydraulic fluid port A oil-feed, after forcing one-way valve opens, hydraulic oil directly enters the first cavity volume 9, thus promotes piston assembly to left movement, system breakout pressure is steady, after piston assembly and individual buffer device 5 disengage, one-way valve 6 is closed, and the oil duct that the hydraulic oil entered from hydraulic fluid port A is established in individual buffer device 5 enters the first cavity volume 9.
In addition, present invention also offers a kind of hoist, comprise the buffering hydraulic oil cylinder described in above-described embodiment.The various actions that hoist carries out generally need to be controlled by hydraulic actuator (such as oil hydraulic cylinder), if hydraulic actuator with outer load larger time, preferably can underspeed when moving to end of travel, to reduce the compression shock of hydraulic actuator inside, complete machine more steady safety when performing an action can be made like this.
Such as, for front-handling mobile crane, need when its work by suspender at the larger object of the weight such as dead ahead handling shipping container, within beginning a period of time of handling process, in order to increase work efficiency, generally need oil hydraulic cylinder with speed motion faster, and when moving to the end of travel of hydraulic jack, then need to reduce movement velocity, to reduce the compression shock produced when piston assembly arrives hydraulic jack end, thus make the process of handling shipping container comparatively steady, thus improve the life-span of hoist.Except for front-handling mobile crane, hydraulic jack of the present invention also can be used for other all kinds to be needed to perform in the hoist of pooling feature, certainly also can be widely used in the engineering machinery of other type.
Hydraulic cushion oil cylinder due to the embodiment of the present invention applies flexible flow area throttling buffering and instead of change matching gap throttling buffering on cushioning principle, and by piston assembly, contacting travel control is carried out to individual buffer device, just can enable individual buffer device under the promotion of piston assembly, realize the end pooling feature of cushion cylinder, this improvement can reduce processing to cushion cylinder and installation precision requirement, and can the functional reliability of Promoting Layered Buffer oil cylinder.Thus the hoist that have employed this kind of hydraulic cushion oil cylinder operationally also possesses higher reliability, and due to this hydraulic cushion oil cylinder breakout pressure less, compression shock can be reduced, hoist just can be made to avoid violent shake when being switched to backhaul action as far as possible and impact, these advantages all can improve safety class during hoist execution operation further, simultaneous buffering oil cylinder is not easy to damage and also can extends maintenance intervals, thus reduces maintenance cost.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And do not depart from the spirit of technical solution of the present invention, all should be encompassed in request of the present invention protection technological scheme scope in the middle of.
Claims (12)
1. a hydraulic cushion oil cylinder, it is characterized in that, comprise: cylinder barrel (4), piston assembly and individual buffer device (5), the first cavity volume (9) is formed between the cylinder bottom (7) of described piston assembly and described cylinder barrel (4), described cylinder bottom (7) is provided with hollow structure, described individual buffer device (5) is located in described hollow structure movingly, and mineralization pressure counter balance pocket between the closed end of one end and described cylinder bottom (7), the oil duct established in described individual buffer device (5) respectively with described first cavity volume (9), described pressure balance chamber is communicated with the hydraulic fluid port (A) be opened on described cylinder barrel (4), what described individual buffer device (5) can change described first cavity volume (9) and described hydraulic fluid port (A) under the promotion of described piston assembly is communicated with cross section, to carry out throttling to the hydraulic oil in described first cavity volume (9) when described hydraulic fluid port (A) flows out.
2. hydraulic cushion oil cylinder according to claim 1, is characterized in that, is provided with elastic element in described pressure balance chamber, and described individual buffer device (5) can be made when described piston assembly reversing motion to reset.
3. hydraulic cushion oil cylinder according to claim 1, it is characterized in that, oil duct residing for described hydraulic fluid port (A) is provided with the collateral branch's oil duct be communicated with described first cavity volume (9), be provided with one-way valve (6) in described collateral branch oil duct, the unilaterally connected from described hydraulic fluid port (A) to described first cavity volume (9) can be realized.
4. according to the arbitrary described hydraulic cushion oil cylinder of claims 1 to 3, it is characterized in that, described hollow structure is the poroid cavity coaxially arranged with the center line of described hydraulic cushion oil cylinder, described individual buffer device (5) is the column structure suitable with described poroid cavity, one end of described individual buffer device (5) extend in described first cavity volume (9), forms described pressure balance chamber between the closed end of the other end and described cylinder bottom (7).
5. hydraulic cushion oil cylinder according to claim 4, it is characterized in that, the oil duct established in described individual buffer device (5) comprises: radial direction is opened in the first oil duct (51) that described individual buffer device (5) extend into the one end in described first cavity volume (9), radial direction is opened in second oil duct (52) of the position corresponding with described hydraulic fluid port (A) and is axially opened between described first oil duct (51) and described second oil duct (52) and the 3rd oil duct (53) be interconnected, described first oil duct (51) and described second oil duct (52) form the first hydraulic fluid port (11) and the second hydraulic fluid port (12) on the surface of described individual buffer device (5) respectively.
6. hydraulic cushion oil cylinder according to claim 5, it is characterized in that, offer pressure compensation opening (10) between described second oil duct (52) and described pressure balance chamber, described first cavity volume (9) and described pressure balance chamber can be made to be interconnected.
7. hydraulic cushion oil cylinder according to claim 5, it is characterized in that, described second hydraulic fluid port (12) is wedge shape annular groove, can, after described second oil duct (52) and the oil duct residing for described hydraulic fluid port (A) stagger, described second hydraulic fluid port (12) still can be kept to be communicated with described hydraulic fluid port (A).
8. hydraulic cushion oil cylinder according to claim 2, it is characterized in that, also comprise adjusting screw (14), described adjusting screw (14) is arranged on the closed end of described cylinder bottom (7) position corresponding with described elastic element, can regulate the pretightening force size of described elastic element.
9. hydraulic cushion oil cylinder according to claim 2, it is characterized in that, described individual buffer device (5) is provided with reentrant part near the side of described pressure balance chamber, described elastic element is spring (13), and the two ends of described spring (13) lean the closed end of bottom in the female portion and described cylinder bottom (7) respectively.
10. hydraulic cushion oil cylinder according to claim 2, is characterized in that, described hollow structure is provided with boss near the side of described first cavity volume (9), can carry out spacing when described individual buffer device (5) resets.
11. hydraulic cushion oil cylinders according to claim 1, is characterized in that, also comprise seal ring (3), and described seal ring (3) is arranged between described individual buffer device (5) and the fitting surface of described hollow structure.
12. 1 kinds of hoists, is characterized in that, comprise the arbitrary described hydraulic cushion oil cylinder of claim 1 ~ 11.
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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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| CN106907369A (en) * | 2017-04-19 | 2017-06-30 | 雷沃重工股份有限公司 | Agricultural machinery lift cylinder |
| CN108757630A (en) * | 2018-06-19 | 2018-11-06 | 中航飞机起落架有限责任公司 | A kind of quick-release pressurized strut |
| CN109707689A (en) * | 2018-12-29 | 2019-05-03 | 燕山大学 | variable damping valve |
| CN112879382A (en) * | 2021-03-15 | 2021-06-01 | 大连天重散装机械设备有限公司 | Hydraulic oil cylinder |
| CN113085114A (en) * | 2021-04-06 | 2021-07-09 | 余姚市鹰图机械设备有限公司 | Assembling 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 | Cylinder Shock Valves and Hydraulic Cylinders |
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| CN113085114A (en) * | 2021-04-06 | 2021-07-09 | 余姚市鹰图机械设备有限公司 | Assembling 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 | Cylinder Shock Valves and Hydraulic Cylinders |
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