CN202381449U - Hydraulic cylinder, hydraulic system and engineering machinery - Google Patents
Hydraulic cylinder, hydraulic system and engineering machinery Download PDFInfo
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- CN202381449U CN202381449U CN2011205425620U CN201120542562U CN202381449U CN 202381449 U CN202381449 U CN 202381449U CN 2011205425620 U CN2011205425620 U CN 2011205425620U CN 201120542562 U CN201120542562 U CN 201120542562U CN 202381449 U CN202381449 U CN 202381449U
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- wedged hole
- hydraulic jack
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Abstract
The utility model discloses a hydraulic cylinder with a locking device, comprising a piston, a piston rod and the locking device, the locking device is provided with a wedge-shaped hole and a wedge-shaped piece, when the locking is in a locking state, the wedge-shaped piece is locked between the piston rod and the wedge-shaped hole and is capable of moving from a big end to a small end. When the hydraulic cylinder is necessarily locked, the piston rod is clamped in a gap of the wedge-shaped piece between the wedge-shaped hole and the piston, so that the piston rod is locked at a determined position. Hydraulic oil in a rodless cavity and the hydraulic cylinder can commonly act on the hydraulic cylinder, so that the piston rod is locked at the determined position to ensure the piston rod can not retract randomly. According to the utility model, a hydraulic system further is disclosed, and the hydraulic system comprises the hydraulic cylinder. According to the utility model, an engineering machinery further is disclosed, and the engineering machinery comprises the hydraulic system.
Description
Technical field
The utility model relates to the hydraulics field, particularly relates to a kind of hydraulic jack.The utility model also relates to a kind of hydraulic system that comprises above-mentioned hydraulic jack.In addition, the utility model also relates to a kind of engineering machinery that comprises above-mentioned hydraulic system.
Background technique
Along with the fast development of China's economic construction, hydraulic system increases in the application of engineering machinery field day by day.Hydraulic system be with hydraulic oil as working medium, utilize hydraulic oil pressure can and the package unit through the work of operating hydraulically operated actuator such as hydraulic control component.
Hydraulic system generally includes dynamical element, executive component, control unit and auxiliary element.The effect of dynamical element is the pressure ability that the mechanical energy of prime mover is converted to liquid.The effect of executive component is that the pressure with liquid can convert mechanical energy into, drives load and does straight reciprocating motion or rotation motion.Control unit controls and regulates pressure, flow and the direction of liquid in hydraulic system.Hydraulic jack is can change hydraulic pressure into mechanical energy, and does the hydraulic actuator of straight reciprocating motion or oscillating motion.
When the hydraulic jack of engineering machinery drove some mechanism as executive component, its flexible end bore than heavy load usually, then requires said hydraulic jack not withdraw automatically.The lifting arm support of Elevating platform fire truck is for example operated by professional operator and the fireman to be delivered to certain altitude is realized height rescue or fire-fighting operation.If the uncontrolled retraction of lifting arm support not only impacts vehicle performance, and can cause security incident.
Said hydraulic jack all belongs to out-of-control phenomenon because of the nothing control retraction that load gravity or deadweight effect occur, and for preventing that this kind situation from taking place to cause security incident, must guarantee that said flexible end goes up at an arbitrary position and can be locked.A kind of typical method is to adopt hydraulic principle that said flexible end is locked in the arbitrary position.Please refer to Fig. 1, Fig. 1 is a kind of typical hydraulic cylinder structure schematic representation.
The rodless cavity hydraulic fluid port 3 of hydraulic jack all links to each other with three position four-way directional control valve 5 with rod chamber hydraulic fluid port 4; Two other hydraulic fluid port of said three position four-way directional control valve 5 connects oil supply loop respectively and unloads oil return line, and the oil circuit between said rodless cavity and the said three position four-way directional control valve 5 has equilibrium valve 6.
When said three position four-way directional control valve 5 is in position, a left side or right position, the rod chamber of said hydraulic jack or rodless cavity fuel feeding; When said four three-way diverter valves 5 are in meta, said rodless cavity fuel cut-off, the hydraulic oil of rodless cavity is balanced valve 6 and seals, and can't reflux, thereby keep certain pressure that piston 1 and piston rod 2 are locked on this position.
The stroke of the flexible end of the hydraulic jack of using in the engineering machinery usually is longer, and being responsible for of receiving is bigger, and the precision that its piston seal cooperates has deviation slightly, will cause letting out in the oil cylinder; Secondly the matching gap of hydraulic jack control valve and accuracy of manufacturing error are let out in also can producing; When ambient temperature was very low, the high temperature hydraulic fluid temperature sharply descended, and the volume of hydraulic oil will reduce.Above-mentioned situation all can cause the rodless cavity pressure of hydraulic jack to reduce, thereby causes the uncontrolled retraction of flexible end, not only can impact vehicle performance, and serious also can cause security incident.
Therefore, how eliminating the potential safety hazard of hydraulic jack, is the present technical issues that need to address of those skilled in the art.
The model utility content
The purpose of the utility model provides a kind of hydraulic jack, and this hydraulic jack is safe and reliable in the course of the work.Another purpose of the utility model provides a kind of hydraulic system that comprises above-mentioned hydraulic jack.The 3rd purpose of the utility model provides a kind of engineering machinery that comprises above-mentioned hydraulic system.
In order to solve the problems of the technologies described above, the utility model provides a kind of hydraulic jack, comprises piston and piston rod, also comprises locking device, and said locking device has wedged hole and at least two wedge that cooperate with said wedged hole; Said locking device is sleeved on the said piston rod through said wedged hole, and the two ends of said wedged hole all have cavity, and said wedge is between said piston rod and said wedged hole; When said locking device was in locking state, said wedge was stuck between said piston rod and the said wedged hole and has the movement tendency of big end towards small end.
Preferably, the small end of said wedged hole is towards said piston, is positioned at the spring that the cavity of the big end of said wedged hole has compressive state in the said locking device, the cavity that is positioned at said wedged hole small end through selector valve and oil supply loop with unload oil return line and link to each other; When said locking device is in locking state, the cavity emptying of said wedged hole small end.
Preferably, the rod chamber of said hydraulic jack and rodless cavity through three position four-way directional control valve and oil supply loop with unload oil return line and link to each other; Said hydraulic jack all links to each other with said selector valve through one-way valve with pipeline between the said three position four-way directional control valve, and the liquid in the said pipeline can flow to said selector valve through said one-way valve.
Preferably, the pipeline between the hydraulic fluid port of said rodless cavity and the said three position four-way directional control valve has equilibrium valve; Pipeline between said selector valve and the said one-way valve has reduction valve.
Preferably, be positioned at the spring that the cavity of said wedged hole small end has compressive state in the said locking device, the cavity that is positioned at the big end of said wedged hole through selector valve and oil supply loop with unload oil return line and link to each other; When said locking device is in locking state, the cavity fuel feeding of the big end of said wedged hole.
Preferably, two of said locking device said cavitys through four-way change-over valve and oil supply loop with unload oil return line and link to each other; When said locking device is in locking state, the cavity fuel feeding of the big end of said wedged hole.
Preferably, the sidewall of said wedged hole has the chute of generatrix direction, and the said wedge outside has the slide block that cooperates with said chute, and all quantity and the position distribution with said wedge is identical with position distribution for said chute quantity.
Preferably, all have baffle plate in two said cavitys, two said baffle plates all contact with the end of said Tapered Cup.
The utility model also provides a kind of hydraulic system, comprises oil hydraulic pump and hydraulic jack, and said hydraulic jack is above-mentioned each described hydraulic jack.
The utility model also provides a kind of engineering machinery, comprises lifting high lift platform and hydraulic system thereof, and said hydraulic system is above-mentioned hydraulic system.
The hydraulic jack that the utility model provides comprises piston and piston rod, also comprises locking device, and said locking device has wedged hole and at least two wedge that cooperate with said wedged hole; Said locking device is sleeved on the said piston rod through said wedged hole, and the two ends of said wedged hole all have cavity, and said wedge is between said piston rod and said wedged hole; When said locking device was in locking state, said wedge was stuck between said piston rod and the said wedged hole and has the movement tendency of big end towards small end.
When said hydraulic jack need be locked; Said wedge has the movement tendency of big end towards small end; Be that said wedge is filled in the space between said wedged hole and the said piston rod, said wedge clamps said piston rod, with said piston rod at definite locking position.
At this moment, said hydraulic jack makes said piston rod at definite locking position by hydraulic oil in the rodless cavity and said locking device acting in conjunction.Even leaking appears in the hydraulic element of said hydraulic jack, said locking device can guarantee that also said piston rod is locked in definite position, the not phenomenon of controlled retraction can not occur, and said locking device has guaranteed the reliability in the said hydraulic jack work.
In a kind of mode, the small end of said wedged hole is towards said piston, is positioned at the spring that the cavity of the big end of said wedged hole has compressive state in the said locking device, the cavity that is positioned at said wedged hole small end through selector valve and oil supply loop with unload oil return line and link to each other; When said locking device is in locking state, the cavity emptying of said wedged hole small end.
The thrust that the big end of said wedge receives can be provided by spring, and the thrust that small end receives can be provided by the oil pressure of hydraulic oil, when needing said wedge to lock said piston rod, makes the cavity emptying of small end; When needing said wedge to unclamp said piston rod, to the cavity fuel feeding of small end, hydraulic oil will promote said wedge and then promote said length of spring compressed, make said wedge be in releasing orientation.
In a kind of preferred mode, the rod chamber of said hydraulic jack and rodless cavity through three position four-way directional control valve and oil supply loop with unload oil return line and link to each other; Said hydraulic jack all links to each other with said selector valve through one-way valve with pipeline between the said three position four-way directional control valve, and the liquid in the said pipeline can flow to said selector valve through said one-way valve.
In the rod chamber of said hydraulic jack and the rodless cavity during any one fuel feeding; The high-pressure and hydraulic oil of its oil feeding line is the cavity fuel feeding of said wedged hole small end through said one-way valve and said three-way diverter valve; Said hydraulic oil can promote said length of spring compressed through said wedge, makes said wedge move and be in releasing orientation to himself big end.During said hydraulic jack fuel cut-off, the cavity of said wedged hole small end and emptying circuit communication emptying, said spring elongation this moment also promotes said wedge and moves and be in locking state to himself small end.
In the another kind of mode, be positioned at the spring that the cavity of said wedged hole small end has compressive state in the said locking device, the cavity that is positioned at the big end of said wedged hole through selector valve and oil supply loop with unload oil return line and link to each other; When said locking device is in locking state, the cavity fuel feeding of the big end of said wedged hole.
At this moment, the thrust that said wedge small end receives is provided by spring, and the thrust that big end receives is provided by the oil pressure of hydraulic oil, when needing said wedge to lock said piston rod, and the cavity fuel feeding of Xiang Daduan; When needing said wedge to unclamp said piston rod, make the cavity emptying of big end, the pressure of said spring will make said wedge be in releasing orientation.
In another kind of mode, two said cavitys of said locking device through four-way change-over valve and oil supply loop with unload oil return line and link to each other; When said locking device is in locking state, the cavity fuel feeding of the big end of said wedged hole.
The cavity fuel feeding of the big end of said wedged hole, the cavity emptying of small end, said locking device will be in locking state; The cavity emptying of the big end of said wedged hole, the cavity fuel feeding of small end, said locking device will be in releasing orientation.Said wedged hole two ends cavity replaces fuel feeding and emptying, can realize the switching between said wedge locking state and releasing orientation.
Further in the mode, the sidewall of said wedged hole has the chute of generatrix direction, and the said wedge outside has the slide block that cooperates with said chute, and all quantity and the position distribution with said wedge is identical with position distribution for said chute quantity.
In the locking state of said wedge and the releasing orientation handoff procedure, said wedge is slided along the direction of said chute, in the sliding process, and the locking of said wedged hole or unclamp said piston rod.Said chute matches with said slide block, helps said wedge in said wedged hole, to slide.
The utility model also provides a kind of hydraulic system, comprises above-mentioned hydraulic jack, and the hydraulic jack of this hydraulic system is safe and reliable in the course of the work, and not controlled retraction phenomenon can not appear in its flexible end.
The utility model also provides a kind of engineering machinery, comprises above-mentioned hydraulic system, and the hydraulic system of this project machinery has very high reliability at work.
Description of drawings
Fig. 1 is a kind of typical hydraulic cylinder structure schematic representation;
The structural representation of a kind of embodiment of hydraulic jack that Fig. 2 is provided for the utility model embodiment;
Fig. 3 is the releasing orientation schematic representation of a kind of embodiment of locking device of hydraulic jack shown in Figure 2;
Fig. 4 is the locking state schematic representation of the another kind of embodiment of locking device of hydraulic jack shown in Figure 2.
Fig. 5 is the structural representation of wedged hole and a kind of fit system of wedge in the locking device of hydraulic jack shown in Figure 2;
Fig. 6 is the sectional view of the fit system of wedged hole shown in Figure 5 and wedge.
Embodiment
The core of the utility model provides a kind of hydraulic jack, and this hydraulic jack has higher reliability in the course of the work.Another core of the utility model provides a kind of hydraulic system that comprises above-mentioned hydraulic jack.The 3rd core of the utility model provides a kind of engineering machinery that comprises above-mentioned hydraulic system.
In order to make those skilled in the art person understand the utility model scheme better, the utility model is done further to specify below in conjunction with accompanying drawing and embodiment.
Please refer to Fig. 2 to Fig. 4, the structural representation of a kind of embodiment of hydraulic jack that Fig. 2 is provided for the utility model embodiment; Fig. 3 is the releasing orientation schematic representation of a kind of embodiment of locking device of hydraulic jack shown in Figure 2; Fig. 4 is the locking state schematic representation of the another kind of embodiment of locking device of hydraulic jack shown in Figure 2.
In a kind of concrete mode of execution, the utility model provides a kind of hydraulic jack, comprises piston 1, piston rod 2 and locking device 7, and said locking device 7 has wedged hole 71 and at least two wedge 72 that cooperate with said wedged hole 71; Said locking device 7 is sleeved on the said piston rod 2 through said wedged hole 71, and the two ends of said wedged hole 71 all have cavity 73, and said wedge 72 is between said piston rod 2 and said wedged hole 71; When said locking device 7 was in locking state, said wedge 72 was stuck between said piston rod 2 and the said wedged hole 71 and has the movement tendency of big end towards small end.
When said hydraulic jack need be locked; Said wedge 72 has the movement tendency of big end towards small end; Be that said wedge 72 is filled in the space between said wedged hole 71 and the said piston rod 2, said wedge 72 clamps said piston rod 2, with said piston rod 2 at definite locking position.
At this moment, said hydraulic jack makes said piston rod 2 at definite locking position by hydraulic oil in the rodless cavity and said locking device acting in conjunction.Even leaking appears in the hydraulic element of said hydraulic jack, said locking device can guarantee that also said piston rod 2 is locked in definite position, the not phenomenon of controlled retraction can not occur, and said locking device has guaranteed the reliability in the said hydraulic jack work.
Said locking device can be arranged on the outside of said hydraulic jack end cap 8.Said wedged hole 71 can small end towards said piston 1, also can hold greatly towards said piston 1.When the big end of said wedged hole 71 during towards said piston 1, said wedge 72 big ends receive enough big thrust and also can institute's piston cylinder 2 be locked.
In the another kind of concrete mode of execution; The small end of said wedged hole 71 is towards said piston 1; Be positioned at the spring 751 that the cavitys 73 of said wedged hole 71 big ends have compressive state in the said locking device 7, the cavity 73 that is positioned at said wedged hole 71 small ends through selector valve 9 and oil supply loop with unload oil return line and link to each other; When said locking device 7 is in locking state, cavity 73 emptyings of said wedged hole 71 small ends.
When the thrust that said wedge 72 big ends receive receives thrust greater than said wedge 72 small ends, said wedge 72 will be in locking state; When the thrust that said wedge 72 small ends receive is held the thrust that receives greatly greater than said wedge 72, said wedge 72 will be in releasing orientation gradually.
The thrust that said wedge 72 big ends receive can be provided by spring 751, and the thrust that small end receives can be provided by the oil pressure of hydraulic oil.When needing the said piston rod 2 of locking, said spring 751 application of forces, cavity 73 emptyings of small end; In the time of need unclamping said piston rod 2, to cavity 73 fuel feeding of small end, hydraulic oil will promote said wedge 72 and then promote said spring 751 compressions, realize the switching between said wedge 72 locking states and the releasing orientation.
During said cavity 73 fuel feeding, link to each other with oil supply loop through said three-way diverter valve 9; During said cavity 73 emptyings, through said three-way diverter valve 9 with unload oil return line and link to each other.Said three-way diverter valve 9 can be the two-bit triplet selector valve, can also be the two-bit triplet selector valve of Electromagnetic Control.
Certainly, said cavity 73 fuel feeding states and the switching of unloading between the oil condition not only are confined to above-mentioned situation, also can realize through other modes.
In the further preferred embodiment, the rod chamber of said hydraulic jack and rodless cavity through three position four-way directional control valve 5 and oil supply loop with unload oil return line and link to each other; Said hydraulic jack all links to each other with said selector valve 9 through one-way valve 10 with pipeline between the said three position four-way directional control valve 5, and the liquid in the said pipeline can flow to said selector valve 9 through said one-way valve 10.
In the rod chamber of said hydraulic jack and the rodless cavity during any one fuel feeding; Cavity 73 fuel feeding that the high-pressure and hydraulic oil of its oil feed line is said wedged hole 71 small ends through said one-way valve 10 and said three-way diverter valve 9; Said hydraulic oil can promote said spring 751 compressions through said wedge 72, makes said wedge 72 move and be in releasing orientation to himself big end.During said hydraulic jack fuel cut-off, the cavity of said wedged hole 71 small ends and emptying circuit communication emptying, said spring 751 elongations this moment also promote said wedge 72 and move and be in locking state to himself small end.
When said three position four-way directional control valve 5 is in meta, said hydraulic jack fuel cut-off, said cavity 73 emptyings; When said three position four-way directional control valve 5 is in right position or position, a left side, said hydraulic jack fuel feeding, said cavity 73 is communicated with said oil feed line, and said cavity 73 and said hydraulic jack be fuel feeding simultaneously.
In the further concrete mode of execution, the pipeline between the hydraulic fluid port of said rodless cavity and the said three position four-way directional control valve 5 has equilibrium valve 6; Pipeline between said selector valve 9 and the said one-way valve 10 has reduction valve 11.
When said equilibrium valve 6 can guarantee said hydraulic jack rod chamber fuel feeding, said piston rod 2 steadily bounced back.Certainly, can realize that said piston rod 2 steadily also can use by other valves or the valve combination of retraction in this loop.
It is excessive that said reduction valve 11 can avoid flowing to the hydraulic fluid pressure of said cavity 73, and the hydraulic fluid pressure in the said cavity 73 is excessive may to cause leaking or damaging said wedge 72.Certainly, also can adopt other modes to avoid the hydraulic fluid pressure in the said cavity 73 excessive.
In the another kind of concrete mode of execution, be positioned at the spring 751 that the cavity 73 of said wedged hole 71 small ends has compressive state in the said locking device 7, the cavitys 73 that are positioned at said wedged hole 71 big ends through selector valve 9 and oil supply loop with unload oil return line and link to each other; When said locking device 7 is in locking state, cavity 73 fuel feeding of said wedged hole 71 big ends.
In this structure, the thrust that said wedge 72 small ends receive is provided by spring 751, and the thrust that big end receives is provided by the oil pressure of hydraulic oil.When needing the said piston rod 2 of locking, cavity 73 fuel feeding of Xiang Daduan, hydraulic oil will promote said wedge 72 and then promote said spring 751 to compress; In the time of need unclamping said piston rod 2, said spring 751 application of forces make cavity 73 emptyings of big end, have equally also realized the switching between said wedge 72 locking states and the releasing orientation.
During said cavity 73 fuel feeding, link to each other with high pressure fuel source through said three-way diverter valve 9; During said cavity 73 emptyings, link to each other with the low pressure oil sources through said three-way diverter valve 9.Similar with the foregoing description, said three-way diverter valve 9 also can be the two-bit triplet selector valve of two-bit triplet selector valve or Electromagnetic Control.
In the another kind of concrete mode of execution, two said cavitys 73 of said locking device 7 through four-way change-over valve and oil supply loop with unload oil return line and link to each other; When said locking device 7 is in locking state, cavity 73 fuel feeding of said wedged hole 71 big ends.
Said hydraulic oil supply system needs cavity 73 fuel feeding of a side of the application of force to said wedge 72, be that said wedge 72 provides thrust by the pressure of hydraulic oil, promotes said wedge 72 and moves, and changes the state of said wedge 72.
Said four-way change-over valve can be two position and four-way reversing valves, also can be three position four-way directional control valve.The alternately fuel feeding of two said cavitys 73 can be realized through four-way change-over valve, also can realize through other modes.
In sum, according to said hydraulic jack whether fuel feeding control the state of said locking device, promptly control the position of said wedge.
During said hydraulic jack fuel cut-off, the thrust that the thrust that said wedge 72 big ends receive receives greater than said wedge 72 small ends; In the rod chamber of said hydraulic jack and the rodless cavity during arbitrary oil pocket fuel feeding, the thrusts that the thrust that said wedge 72 small ends receive receives greater than said wedge 72 big ends.
During said hydraulic jack fuel feeding, said piston rod 2 will produce and move, and make said wedge 72 be in releasing orientation this moment, and said piston rod 2 can move freely.During said hydraulic jack fuel cut-off, said piston rod 2 is positioned to be confirmed the position and needs locking, and make said wedge 72 be in locking state this moment, with said piston rod 2 lockings.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is the structural representation of wedged hole and a kind of fit system of wedge in the locking device of hydraulic jack shown in Figure 2, and Fig. 6 is the sectional view of the fit system of wedged hole shown in Figure 5 and wedge.
In the further concrete mode of execution; The sidewall of said wedged hole 71 has the chute 711 of generatrix direction; The said wedge outside 72 has the slide block 723 that cooperates with said chute 711, and all quantity and the position distribution with said wedge 72 is identical with position distribution for said chute 711 quantity.
In the locking state of said wedge 72 and the releasing orientation handoff procedure, said wedge 72 moves on said piston rod 2 axial directions, slides along the bus of said wedged hole 71, locks or unclamps said piston rod 2.Said chute 711 matches with said slide block, helps said wedge 72 in said wedged hole 71, to slide.
The direction of said bus is the gathering trend of said wedged hole 71; Also be the glide direction of said wedge 72 simultaneously; But be not that said wedged hole 71 1 is decided to be solid of rotation, can the base on practicality wedged hole 71 of model utility of the hole that can realize 72 lockings of said wedge or unclamp said piston rod 2.
Certainly, said wedge 72 is not limited only to the described situation of the foregoing description with said wedged hole 71 fit forms, can realize that other fit forms that relatively move between said wedge 72 and the said wedged hole 71 also are fine.
In sum, said wedge 72 can have two incessantly.Said wedge 72 is during more than two, and each said wedge 72 can constitute complete cambridge ring, also can not constitute complete cambridge ring; The best distribution form of each said wedge 72 is around said piston rod 2, evenly to distribute, and makes said piston rod 2 stressed evenly.
In the further concrete mode of execution, all have 74, two said baffle plates 74 of baffle plate in two said cavitys 73 and all contact with the end of said Tapered Cup 72.
Said hydraulic oil or said spring 751 promote said wedge 72 through said baffle plate 74; When said baffle plate 74 promotes said wedge 72; Said wedge 72 moves along said piston rod 2 axial directions; Simultaneously, said wedge 72 also can be slided along said chute 711, locks or unclamps said piston rod 2.
Except above-mentioned hydraulic jack, the utility model also provides a kind of hydraulic system that comprises above-mentioned hydraulic jack, and the structure of these other each several parts of hydraulic system please refer to existing technology, and this paper repeats no more.
In addition, the utility model also provides a kind of engineering machinery that comprises above-mentioned hydraulic system, and the structure of other each several parts of this project machinery please refer to existing technology, and this paper repeats no more.
More than engineering machinery, hydraulic system and hydraulic jack thereof that the utility model provided have been carried out detailed introduction.Used concrete example among this paper the principle and the mode of execution of the utility model are set forth, above embodiment's explanation just is used to help to understand the method and the core concept thereof of the utility model.Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (10)
1. a hydraulic jack comprises piston (1) and piston rod (2), it is characterized in that, also comprises locking device (7), and said locking device (7) has wedged hole (71) and at least two wedge (72) that cooperate with said wedged hole (71); Said locking device (7) is sleeved on the said piston rod (2) through said wedged hole (71), and the two ends of said wedged hole (71) all have cavity (73), and said wedge (72) is positioned between said piston rod (2) and the said wedged hole (71); Said locking device (7) is when being in locking state, and said wedge (72) is stuck between said piston rod (2) and the said wedged hole (71) and has the movement tendency of big end towards small end.
2. hydraulic jack as claimed in claim 1; It is characterized in that; The small end of said wedged hole (71) is towards said piston (1); Be positioned at the spring (751) that the cavity (73) of the big end of said wedged hole (71) has compressive state in the said locking device (7), the cavity (73) that is positioned at said wedged hole (71) small end through selector valve (9) and oil supply loop with unload oil return line and link to each other; Said locking device (7) is when being in locking state, cavity (73) emptying of said wedged hole (71) small end.
3. hydraulic jack as claimed in claim 2 is characterized in that, the rod chamber of said hydraulic jack and rodless cavity through three position four-way directional control valve (5) and oil supply loop with unload oil return line and link to each other; Said hydraulic jack all links to each other with said selector valve (9) through one-way valve (10) with pipeline between the said three position four-way directional control valve (5), and the liquid in the said pipeline can flow to said selector valve (9) through said one-way valve (10).
4. hydraulic jack as claimed in claim 3 is characterized in that, the pipeline between the hydraulic fluid port of said rodless cavity and the said three position four-way directional control valve (5) has equilibrium valve (6); Pipeline between said selector valve (9) and the said one-way valve (10) has reduction valve (11).
5. hydraulic jack as claimed in claim 1; It is characterized in that; The cavity (73) that is positioned at said wedged hole (71) small end in the said locking device (7) has the spring (751) of compressive state, the cavity (73) that is positioned at the big end of said wedged hole (71) through selector valve (9) and oil supply loop with unload oil return line and link to each other; Said locking device (7) is when being in locking state, and said wedged hole (71) is cavity (73) fuel feeding of end greatly.
6. hydraulic jack as claimed in claim 1 is characterized in that, two said cavitys (73) of said locking device (7) through four-way change-over valve and oil supply loop with unload oil return line and link to each other; Said locking device (7) is when being in locking state, and said wedged hole (71) is cavity (73) fuel feeding of end greatly.
7. like each described hydraulic jack of claim 1 to 6; It is characterized in that; The sidewall of said wedged hole (71) has the chute (711) of generatrix direction; The said wedge outside (72) has the slide block (723) that cooperates with said chute (711), and all quantity and the position distribution with said wedge (72) is identical with position distribution for said chute (711) quantity.
8. hydraulic jack as claimed in claim 7 is characterized in that, all has baffle plate (74) in two said cavitys (73), and two said baffle plates (74) all contact with the end of said Tapered Cup (72).
9. a hydraulic system comprises oil hydraulic pump and hydraulic jack, it is characterized in that, said hydraulic jack is each described hydraulic jack of claim 1 to 8.
10. an engineering machinery comprises and lifts high lift platform and hydraulic system thereof, it is characterized in that said hydraulic system is the described hydraulic system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205425620U CN202381449U (en) | 2011-12-21 | 2011-12-21 | Hydraulic cylinder, hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205425620U CN202381449U (en) | 2011-12-21 | 2011-12-21 | Hydraulic cylinder, hydraulic system and engineering machinery |
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| Publication Number | Publication Date |
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| CN202381449U true CN202381449U (en) | 2012-08-15 |
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| CN2011205425620U Expired - Lifetime CN202381449U (en) | 2011-12-21 | 2011-12-21 | Hydraulic cylinder, hydraulic system and engineering machinery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425586A (en) * | 2011-12-21 | 2012-04-25 | 徐州重型机械有限公司 | Hydraulic cylinder, hydraulic system and engineering machine |
| CN102788057A (en) * | 2012-08-27 | 2012-11-21 | 徐州重型机械有限公司 | Device for preventing cylinder from moving forwards and crane |
| CN104100594A (en) * | 2014-07-06 | 2014-10-15 | 上海宏信设备工程有限公司 | Composite oblique cone self-locking hydraulic oil cylinder |
| CN110294065A (en) * | 2019-04-30 | 2019-10-01 | 武汉船用机械有限责任公司 | Load test tooling |
| CN113595319A (en) * | 2021-07-16 | 2021-11-02 | 浙江工贸职业技术学院 | Locking device for external electromechanical actuator |
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2011
- 2011-12-21 CN CN2011205425620U patent/CN202381449U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425586A (en) * | 2011-12-21 | 2012-04-25 | 徐州重型机械有限公司 | Hydraulic cylinder, hydraulic system and engineering machine |
| CN102425586B (en) * | 2011-12-21 | 2014-12-10 | 徐州重型机械有限公司 | Hydraulic cylinder, hydraulic system and engineering machine |
| CN102788057A (en) * | 2012-08-27 | 2012-11-21 | 徐州重型机械有限公司 | Device for preventing cylinder from moving forwards and crane |
| CN104100594A (en) * | 2014-07-06 | 2014-10-15 | 上海宏信设备工程有限公司 | Composite oblique cone self-locking hydraulic oil cylinder |
| CN110294065A (en) * | 2019-04-30 | 2019-10-01 | 武汉船用机械有限责任公司 | Load test tooling |
| CN113595319A (en) * | 2021-07-16 | 2021-11-02 | 浙江工贸职业技术学院 | Locking device for external electromechanical actuator |
| CN113595319B (en) * | 2021-07-16 | 2022-06-24 | 浙江工贸职业技术学院 | Locking device for external electromechanical actuator |
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Granted publication date: 20120815 Effective date of abandoning: 20141210 |
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