CN102425586B - Hydraulic cylinder, hydraulic system and engineering machine - Google Patents
Hydraulic cylinder, hydraulic system and engineering machine Download PDFInfo
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- CN102425586B CN102425586B CN201110433240.7A CN201110433240A CN102425586B CN 102425586 B CN102425586 B CN 102425586B CN 201110433240 A CN201110433240 A CN 201110433240A CN 102425586 B CN102425586 B CN 102425586B
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Abstract
The invention discloses a hydraulic cylinder with a locking device. The hydraulic cylinder comprises a piston, a piston rod and the locking device, wherein the locking device is provided with a wedge-shaped hole and a wedge-shaped component, and when the locking device is in a locking state, the wedge-shaped component is clamped between the piston rod and the wedge-shaped hole and the large end tends to move towards the small end. When the hydraulic cylinder needs to be locked, the wedge-shaped component is arranged in a clearance between the wedge-shaped hole and the piston rod to clamp the piston rod, so that the piston rod is locked in a designated position. Hydraulic oil in a rod-free cavity and the locking device of the hydraulic cylinder work commonly, so that the piston rod can be locked in the designated position, the uncontrolled contraction of the piston rod can be avoided, and the working reliability of the hydraulic cylinder can be improved. The invention also discloses a hydraulic system with the hydraulic cylinder and an engineering machine with the hydraulic system.
Description
Technical field
The present invention relates to hydraulics field, particularly relate to a kind of hydraulic jack.The invention still further relates to a kind of hydraulic system that comprises above-mentioned hydraulic jack.In addition, the invention still further 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 day by day in the application of engineering machinery field.Hydraulic system is to using hydraulic oil as working medium, utilizes the pressure energy of hydraulic oil the package unit of working by operating hydraulically operated actuators such as hydraulic control components.
Hydraulic system generally includes dynamical element, executive component, control unit and auxiliary element.The effect of dynamical element is the mechanical energy of prime mover to be converted to the pressure energy of liquid.The effect of executive component is that the pressure energy of liquid is converted to mechanical energy, drives load to do straight reciprocating motion or rotation motion.Control unit controls and regulates pressure, flow and the direction of liquid in hydraulic system.Hydraulic jack is to change hydraulic energy into mechanical energy, and does the hydraulic actuator of straight reciprocating motion or oscillating motion.
When the hydraulic jack of engineering machinery drives some mechanism as executive component, its telescopic end bears conventionally compared with heavy load, requires the described hydraulic jack can not automatic retraction.The lifting arm support of Elevating platform fire truck for example, is operated and fireman is delivered to certain altitude realizes height rescue or fire-fighting operation by professional operator.If the uncontrolled retraction of lifting arm support, not only impacts vehicle performance, and can cause security incident.
Described hydraulic jack all belongs to out-of-control phenomenon because of load gravity or Gravitative Loads appearance without controlling retraction, for preventing that this kind of situation from occurring to cause security incident, must guarantee that described telescopic end is gone up energy at an arbitrary position locked.A kind of typical method is to adopt hydraulic principle that described telescopic end is locked in to arbitrary position.Please refer to Fig. 1, Fig. 1 is a kind of typical hydraulic cylinder structure schematic diagram.
The rodless cavity hydraulic fluid port 3 of hydraulic jack is all connected with three position four-way directional control valve 5 with rod chamber hydraulic fluid port 4, two other hydraulic fluid port of described three position four-way directional control valve 5 connects respectively oil supply loop and unloads oil return line, and the oil circuit between described rodless cavity and described three position four-way directional control valve 5 has equilibrium valve 6.
Described three position four-way directional control valve 5 is in left position or during right position, the rod chamber of described hydraulic jack or rodless cavity fuel feeding; Described four three-way diverter valves 5 when meta, described rodless cavity fuel cut-off, the hydraulic oil of rodless cavity is balanced valve 6 and seals, and cannot reflux, thereby keep certain pressure that piston 1 and piston rod 2 are locked on this position.
The stroke of the telescopic end of the hydraulic jack of conventionally applying in engineering machinery is longer, and being responsible for of being subject to is larger, and the precision that its piston seal coordinates is deviation slightly, will cause letting out in oil cylinder; Secondly the matching gap of hydraulic oil cylinder control valve door and accuracy of manufacturing error are let out in also can producing; When ambient temperature is very low, high temperature hydraulic fluid temperature sharply declines, and the volume of hydraulic oil will reduce.Above-mentioned situation all can cause the rodless cavity pressure decreased of hydraulic jack, thereby causes the uncontrolled retraction of telescopic 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 current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of hydraulic jack, this hydraulic jack is safe and reliable in the course of the work.Another object of the present invention is to provide a kind of hydraulic system that comprises above-mentioned hydraulic jack.The 3rd object of the present invention is to provide a kind of engineering machinery that comprises above-mentioned hydraulic system.
In order to solve the problems of the technologies described above, the invention provides a kind of hydraulic jack, comprise piston and piston rod, also comprise locking device, described locking device has wedged hole and at least two wedge shape parts that coordinate with described wedged hole; Described locking device is sleeved on described piston rod by described wedged hole, and the two ends of described wedged hole all have cavity, and described wedge shape part is between described piston rod and described wedged hole; Described locking device is when locking state, and described wedge shape part is stuck between described piston rod and described wedged hole and has large end towards the movement tendency of small end.
Preferably, the small end of described wedged hole is towards described piston, and the cavity that is positioned at the large end of described wedged hole in described locking device has the spring of compressive state, the cavity that is positioned at described wedged hole small end by selector valve and oil supply loop with unload oil return line and be connected; Described locking device when locking state, the cavity emptying of described wedged hole small end.
Preferably, the rod chamber of described hydraulic jack and rodless cavity by three position four-way directional control valve and oil supply loop with unload oil return line and be connected; Described hydraulic jack is all connected with described selector valve by one-way valve with the pipeline between described three position four-way directional control valve, and the liquid in described pipeline can flow to described selector valve by described one-way valve.
Preferably, the pipeline between the hydraulic fluid port of described rodless cavity and described three position four-way directional control valve has equilibrium valve; Pipeline between described selector valve and described one-way valve has reduction valve.
Preferably, the cavity that is positioned at described wedged hole small end in described locking device has the spring of compressive state, the cavity that is positioned at the large end of described wedged hole by selector valve and oil supply loop with unload oil return line and be connected; Described locking device when locking state, the cavity fuel feeding of the large end of described wedged hole.
Preferably, two of described locking device described cavitys by four-way change-over valve and oil supply loop with unload oil return line and be connected; Described locking device when locking state, the cavity fuel feeding of the large end of described wedged hole.
Preferably, the sidewall of described wedged hole has the chute of generatrix direction, and described wedge shape part outside has the slide block coordinating with described chute, and described chute quantity is all identical with quantity and the position distribution of described wedge shape part with position distribution.
Preferably, in two described cavitys, all have baffle plate, two described baffle plates all contact with the end of described wedge shape part.
The present invention also provides a kind of hydraulic system, comprises oil hydraulic pump and hydraulic jack, and described hydraulic jack is the hydraulic jack described in above-mentioned any one.
The present invention also provides a kind of engineering machinery, comprises and lifts high lift platform and hydraulic system thereof, and described hydraulic system is above-mentioned hydraulic system.
Hydraulic jack provided by the invention, comprises piston and piston rod, also comprises locking device, and described locking device has wedged hole and at least two wedge shape parts that coordinate with described wedged hole; Described locking device is sleeved on described piston rod by described wedged hole, and the two ends of described wedged hole all have cavity, and described wedge shape part is between described piston rod and described wedged hole; Described locking device is when locking state, and described wedge shape part is stuck between described piston rod and described wedged hole and has large end towards the movement tendency of small end.
When described hydraulic jack need to be locked, described wedge shape part has large end towards the movement tendency of small end, be that described wedge shape part is filled in the space between described wedged hole and described piston rod, described wedge shape part clamps described piston rod, by described piston rod at definite locking position.
Now, described hydraulic jack, by the hydraulic oil in rodless cavity and described locking device acting in conjunction, makes described piston rod at definite locking position.Even if leaking appears in the hydraulic element of described hydraulic jack, described locking device also can guarantee that described piston rod is locked in definite position, there will not be the not phenomenon of controlled retraction, and described locking device has guaranteed the reliability in described hydraulic jack work.
In a kind of mode, the small end of described wedged hole is towards described piston, and the cavity that is positioned at the large end of described wedged hole in described locking device has the spring of compressive state, the cavity that is positioned at described wedged hole small end by selector valve and oil supply loop with unload oil return line and be connected; Described locking device when locking state, the cavity emptying of described wedged hole small end.
The thrust that the large end of described wedge shape part is subject to can be provided by spring, and the thrust that small end is subject to can be provided by the oil pressure of hydraulic oil, while needing described wedge shape part to lock described piston rod, makes the cavity emptying of small end; While needing described wedge shape part to unclamp described piston rod, to the cavity fuel feeding of small end, hydraulic oil will promote described wedge shape part and then promote described spring-compressed, make described wedge shape part in releasing orientation.
In a kind of preferred mode, the rod chamber of described hydraulic jack and rodless cavity by three position four-way directional control valve and oil supply loop with unload oil return line and be connected; Described hydraulic jack is all connected with described selector valve by one-way valve with the pipeline between described three position four-way directional control valve, and the liquid in described pipeline can flow to described selector valve by described one-way valve.
In the rod chamber of described hydraulic jack and rodless cavity during any one fuel feeding, the high pressure liquid force feed of its oil feeding line is the cavity fuel feeding of described wedged hole small end by described one-way valve and described three-way diverter valve, described hydraulic oil can promote described spring-compressed by described wedge shape part, and described wedge shape part is moved and in releasing orientation to himself large end.During described hydraulic jack fuel cut-off, the cavity of described wedged hole small end and emptying circuit communication emptying, now described spring extends and promotes described wedge shape part and moves and in locking state to himself small end.
In another kind of mode, the cavity that is positioned at described wedged hole small end in described locking device has the spring of compressive state, the cavity that is positioned at the large end of described wedged hole by selector valve and oil supply loop with unload oil return line and be connected; Described locking device when locking state, the cavity fuel feeding of the large end of described wedged hole.
Now, the thrust that described wedge shape part small end is subject to is provided by spring, and the thrust that large end is subject to is provided by the oil pressure of hydraulic oil, while needing described wedge shape part to lock described piston rod, and the cavity fuel feeding of Xiang great Duan; While needing described wedge shape part to unclamp described piston rod, make the cavity emptying of large end, the pressure of described spring will make described wedge shape part in releasing orientation.
In another kind of mode, two described cavitys of described locking device by four-way change-over valve and oil supply loop with unload oil return line and be connected; Described locking device when locking state, the cavity fuel feeding of the large end of described wedged hole.
The cavity fuel feeding of the large end of described wedged hole, the cavity emptying of small end, described locking device will be in locking state; The cavity emptying of the large end of described wedged hole, the cavity fuel feeding of small end, described locking device will be in releasing orientation.Described wedged hole two ends cavity replaces fuel feeding and emptying, can realize the switching between described wedge shape part locking state and releasing orientation.
Further, in mode, the sidewall of described wedged hole has the chute of generatrix direction, and described wedge shape part outside has the slide block coordinating with described chute, and described chute quantity is all identical with quantity and the position distribution of described wedge shape part with position distribution.
In the locking state of described wedge shape part and releasing orientation handoff procedure, described wedge shape part slides along the direction of described chute, in sliding process, and the locking of described wedged hole or unclamp described piston rod.Described chute matches with described slide block, contributes to described wedge shape part to slide in described wedged hole.
The present invention 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 its telescopic end there will not be not controlled retraction phenomenon.
The present invention 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.
Accompanying drawing explanation
Fig. 1 is a kind of typical hydraulic cylinder structure schematic diagram;
The structural representation of a kind of embodiment of hydraulic jack that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the releasing orientation schematic diagram of a kind of embodiment of locking device of the hydraulic jack shown in Fig. 2;
Fig. 4 is the locking state schematic diagram of the another kind of embodiment of locking device of the hydraulic jack shown in Fig. 2.
Fig. 5 is the structural representation of wedged hole and a kind of fit system of wedge shape part in the locking device of the hydraulic jack shown in Fig. 2;
Fig. 6 is the sectional view of the fit system of the wedged hole shown in Fig. 5 and wedge shape part.
Embodiment
Core of the present invention is to provide a kind of hydraulic jack, and this hydraulic jack has higher reliability in the course of the work.Another core of the present invention is to provide a kind of hydraulic system that comprises above-mentioned hydraulic jack.The 3rd core of the present invention is to provide a kind of engineering machinery that comprises above-mentioned hydraulic system.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 2 to Fig. 4, the structural representation of a kind of embodiment of hydraulic jack that Fig. 2 provides for the embodiment of the present invention; Fig. 3 is the releasing orientation schematic diagram of a kind of embodiment of locking device of the hydraulic jack shown in Fig. 2; Fig. 4 is the locking state schematic diagram of the another kind of embodiment of locking device of the hydraulic jack shown in Fig. 2.
In a kind of concrete mode of execution, the invention provides a kind of hydraulic jack, comprise piston 1, piston rod 2 and locking device 7, described locking device 7 has wedged hole 71 and at least two wedge shape parts 72 that coordinate with described wedged hole 71; Described locking device 7 is sleeved on described piston rod 2 by described wedged hole 71, and the two ends of described wedged hole 71 all have cavity 73, and described wedge shape part 72 is between described piston rod 2 and described wedged hole 71; Described locking device 7 is when locking state, and described wedge shape part 72 is stuck between described piston rod 2 and described wedged hole 71 and has large end towards the movement tendency of small end.
When described hydraulic jack need to be locked, described wedge shape part 72 has large end towards the movement tendency of small end, be that described wedge shape part 72 is filled in the space between described wedged hole 71 and described piston rod 2, described wedge shape part 72 clamps described piston rod 2, by described piston rod 2 at definite locking position.
Now, described hydraulic jack, by the hydraulic oil in rodless cavity and described locking device acting in conjunction, makes described piston rod 2 at definite locking position.Even if leaking appears in the hydraulic element of described hydraulic jack, described locking device also can guarantee that described piston rod 2 is locked in definite position, there will not be the not phenomenon of controlled retraction, and described locking device has guaranteed the reliability in described hydraulic jack work.
Described locking device can be arranged on the outside of described hydraulic jack end cap 8.Described wedged hole 71 can small end towards described piston 1, also can hold greatly towards described piston 1.When the large end of described wedged hole 71 is during towards described piston 1, the large end of described wedge shape part 72 is subject to enough large thrust and also institute's piston cylinder 2 can be locked.
In another kind of concrete mode of execution, the small end of described wedged hole 71 is towards described piston 1, the cavity 73 that is positioned at described wedged hole 71 large ends in described locking device 7 has the spring 751 of compressive state, the cavity 73 that is positioned at described wedged hole 71 small ends by selector valve 9 and oil supply loop with unload oil return line and be connected; Described locking device 7 when locking state, cavity 73 emptyings of described wedged hole 71 small ends.
When the thrust that the large end of described wedge shape part 72 is subject to is greater than described wedge shape part 72 small ends and is subject to thrust, described wedge shape part 72 will be in locking state; The thrust that described wedge shape part 72 small ends are subject to is greater than when described wedge shape part 72 is large holds the thrust being subject to, and described wedge shape part 72 will be gradually in releasing orientation.
The thrust that the large end of described wedge shape part 72 is subject to can be provided by spring 751, and the thrust that small end is subject to can be provided by the oil pressure of hydraulic oil.In the time of need to locking described piston rod 2, described spring 751 application of forces, cavity 73 emptyings of small end; In the time of need to unclamping described piston rod 2, to cavity 73 fuel feeding of small end, hydraulic oil will promote described wedge shape part 72 and then promote described spring 751 compressions, realize the switching between described wedge shape part 72 locking states and releasing orientation.
During described cavity 73 fuel feeding, by described three-way diverter valve 9, be connected with oil supply loop; During described cavity 73 emptying, by described three-way diverter valve 9 with unload oil return line and be connected.Described three-way diverter valve 9 can be two-bit triplet selector valve, can also be the two-bit triplet selector valve of Electromagnetic Control.
Certainly, described cavity 73 confession oil conditions and the switching of unloading between oil condition are not only confined to above-mentioned situation, also can realize by other means.
In further preferred embodiment, the rod chamber of described hydraulic jack and rodless cavity by three position four-way directional control valve 5 and oil supply loop with unload oil return line and be connected; Described hydraulic jack is all connected with described selector valve 9 by one-way valve 10 with the pipeline between described three position four-way directional control valve 5, and the liquid in described pipeline can flow to described selector valve 9 by described one-way valve 10.
In the rod chamber of described hydraulic jack and rodless cavity during any one fuel feeding, the high pressure liquid force feed of its oil feed line is cavity 73 fuel feeding of described wedged hole 71 small ends by described one-way valve 10 and described three-way diverter valve 9, described hydraulic oil can promote described spring 751 compressions by described wedge shape part 72, and described wedge shape part 72 is moved and in releasing orientation to himself large end.During described hydraulic jack fuel cut-off, the cavity of described wedged hole 71 small ends and emptying circuit communication emptying, now described spring 751 extends and promotes described wedge shape part 72 and moves and in locking state to himself small end.
Described three position four-way directional control valve 5 when meta, described hydraulic jack fuel cut-off, described cavity 73 emptyings; Described three position four-way directional control valve 5 is in right position or during left position, described hydraulic jack fuel feeding, and described cavity 73 is communicated with described oil feed line, described cavity 73 and described hydraulic jack while fuel feeding.
Further, in concrete mode of execution, the pipeline between the hydraulic fluid port of described rodless cavity and described three position four-way directional control valve 5 has equilibrium valve 6; Pipeline between described selector valve 9 and described one-way valve 10 has reduction valve 11.
When described equilibrium valve 6 can guarantee described hydraulic jack rod chamber fuel feeding, described piston rod 2 steadily bounces back.Certainly, steadily other valves or the valve combination of retraction also can be applied in this loop can to realize described piston rod 2.
It is excessive that described reduction valve 11 can avoid flowing to the hydraulic fluid pressure of described cavity 73, and hydraulic fluid pressure in described cavity 73 is excessive may cause leaking or damaging described wedge shape part 72.Certainly, also can adopt other modes to avoid the hydraulic fluid pressure in described cavity 73 excessive.
In another kind of concrete mode of execution, the cavity 73 that is positioned at described wedged hole 71 small ends in described locking device 7 has the spring 751 of compressive state, the cavity 73 that is positioned at described wedged hole 71 large ends by selector valve 9 and oil supply loop with unload oil return line and be connected; Described locking device 7 is when locking state, and described wedged hole 71 is cavity 73 fuel feeding of end greatly.
In this structure, the thrust that described wedge shape part 72 small ends are subject to is provided by spring 751, and the thrust that large end is subject to is provided by the oil pressure of hydraulic oil.In the time of need to locking described piston rod 2, cavity 73 fuel feeding of Xiang great Duan, hydraulic oil will promote described wedge shape part 72 and then promote described spring 751 compressions; In the time of need to unclamping described piston rod 2, described spring 751 application of forces, make large cavity 73 emptyings of holding, and have equally also realized the switching between described wedge shape part 72 locking states and releasing orientation.
During described cavity 73 fuel feeding, by described three-way diverter valve 9, be connected with high pressure fuel source; During described cavity 73 emptying, by described three-way diverter valve 9, be connected with low pressure oil sources.Similar with above-described embodiment, described three-way diverter valve 9 can be also the two-bit triplet selector valve of two-bit triplet selector valve or Electromagnetic Control.
In another kind of concrete mode of execution, two described cavitys 73 of described locking device 7 by four-way change-over valve and oil supply loop with unload oil return line and be connected; Described locking device 7 is when locking state, and described wedged hole 71 is cavity 73 fuel feeding of end greatly.
Cavity 73 fuel feeding of described wedged hole 71 large ends, cavity 73 emptyings of small end, described locking device will be in locking state; Cavity 73 emptyings of described wedged hole 71 large ends, cavity 73 fuel feeding of small end, described locking device will be in releasing orientation.Described wedged hole 71 two ends cavitys 73 are fuel feeding and emptying alternately, also can realize the switching between described wedge shape part 72 locking states and releasing orientation.
Described hydraulic oil supply system needs cavity 73 fuel feeding of a side of the application of force to described wedge shape part 72, by the pressure of hydraulic oil, for described wedge shape part 72 provides thrust, promoted described wedge shape part 72 and move, and changes the state of described wedge shape part 72.
Described four-way change-over valve can be two position and four-way reversing valves, can be also three position four-way directional control valve.The alternately fuel feeding of two described cavitys 73 can be realized by four-way change-over valve, also can realize by other means.
In sum, according to described hydraulic jack whether fuel feeding control the state of described locking device, control the position of described wedge shape part.
During described hydraulic jack fuel cut-off, the thrust that the large end of described wedge shape part 72 is subject to is greater than the thrust that described wedge shape part 72 small ends are subject to; In the rod chamber of described hydraulic jack and rodless cavity, during arbitrary oil pocket fuel feeding, the thrust that described wedge shape part 72 small ends are subject to is greater than the thrust that the large end of described wedge shape part 72 is subject to.
During described hydraulic jack fuel feeding, described piston rod 2 will produce mobile, now make described wedge shape part 72 in releasing orientation, and described piston rod 2 can move freely.During described hydraulic jack fuel cut-off, described piston rod 2 is positioned to be determined position and needs locking, now makes described wedge shape part 72 in locking state, by described 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 shape part in the locking device of the hydraulic jack shown in Fig. 2, and Fig. 6 is the sectional view of the fit system of the wedged hole shown in Fig. 5 and wedge shape part.
Further in concrete mode of execution, the sidewall of described wedged hole 71 has the chute 711 of generatrix direction, described wedge shape part outside 72 has the slide block 721 coordinating with described chute 711, and described chute 711 quantity are all identical with quantity and the position distribution of described wedge shape part 72 with position distribution.
In the locking state of described wedge shape part 72 and releasing orientation handoff procedure, described wedge shape part 72 moves on described piston rod 2 axial directions, along the bus of described wedged hole 71, slides, and locks or unclamps described piston rod 2.Described chute 711 matches with described slide block, contributes to described wedge shape part 72 in the interior slip of described wedged hole 71.
The direction of described bus is the gathering trend of described wedged hole 71, also be the glide direction of described wedge shape part 72 simultaneously, but be not that described wedged hole 71 1 is decided to be solid of rotation, the hole that can realize 72 lockings of described wedge shape part or unclamp described piston rod 2 can be applied as wedged hole 71 of the present invention.
Certainly, described wedge shape part 72 and described wedged hole 71 fit forms are not limited only to the situation described in above-described embodiment, can realize other fit forms that relatively move between described wedge shape part 72 and described wedged hole 71 and also be fine.
In sum, described wedge shape part 72 can have two incessantly.Described wedge shape part 72 is during more than two, the cambridge ring that described in each, wedge shape part 72 can complete, cambridge ring that also can not complete; Described in each, the best distribution form of wedge shape part 72 is to be around uniformly distributed at described piston rod 2, makes described piston rod 2 stressed evenly.
Further in concrete mode of execution, two described cavitys 73 are interior all to be had 74, two described baffle plates 74 of baffle plate and all contacts with the end of described wedge shape part 72.
Described hydraulic oil or described spring 751 promote described wedge shape part 72 by described baffle plate 74, when described baffle plate 74 promotes described wedge shape part 72, described wedge shape part 72 moves along described piston rod 2 axial directions, simultaneously, described wedge shape part 72 also can slide along described chute 711, locks or unclamps described piston rod 2.
Except above-mentioned hydraulic jack, the present invention 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 prior art, repeats no more herein.
In addition, the present invention 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 prior art, repeats no more herein.
Above engineering machinery provided by the present invention, hydraulic system and hydraulic jack thereof are described in detail.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a hydraulic jack, comprise piston (1) and piston rod (2), it is characterized in that, also comprise locking device (7), described locking device (7) has wedged hole (71) and at least two wedge shape parts (72) that coordinate with described wedged hole (71); Described locking device (7) is sleeved on described piston rod (2) by described wedged hole (71), the two ends of described wedged hole (71) all have cavity (73), and described wedge shape part (72) is positioned between described piston rod (2) and described wedged hole (71); Described locking device (7) is when locking state, and described wedge shape part (72) is stuck between described piston rod (2) and described wedged hole (71) and has large end towards the movement tendency of small end;
The sidewall of described wedged hole (71) has the chute (711) along its generatrix direction, described wedge shape part (72) outside has the slide block (721) coordinating with described chute (711), and described chute (711) quantity is all identical with quantity and the position distribution of described wedge shape part (72) with position distribution.
2. hydraulic jack as claimed in claim 1, it is characterized in that, the small end of described wedged hole (71) is towards described piston (1), the cavity (73) that is positioned at the large end of described wedged hole (71) in described locking device (7) has the spring (751) of compressive state, the cavity (73) that is positioned at described wedged hole (71) small end by selector valve (9) and oil supply loop with unload oil return line and be connected; Described locking device (7) when locking state, cavity (73) emptying of described wedged hole (71) small end.
3. hydraulic jack as claimed in claim 2, is characterized in that, the rod chamber of described hydraulic jack and rodless cavity by three position four-way directional control valve (5) and oil supply loop with unload oil return line and be connected; Described hydraulic jack is all connected with described selector valve (9) by one-way valve (10) with the pipeline between described three position four-way directional control valve (5), and the liquid in described pipeline can flow to described selector valve (9) by described one-way valve (10).
4. hydraulic jack as claimed in claim 3, is characterized in that, the pipeline between the hydraulic fluid port of described rodless cavity and described three position four-way directional control valve (5) has equilibrium valve (6); Pipeline between described selector valve (9) and described 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 described wedged hole (71) small end in described locking device (7) has the spring (751) of compressive state, the cavity (73) that is positioned at the large end of described wedged hole (71) by selector valve (9) and oil supply loop with unload oil return line and be connected; Described locking device (7) is when locking state, and described wedged hole (71) is cavity (73) fuel feeding of end greatly.
6. hydraulic jack as claimed in claim 1, is characterized in that, two described cavitys (73) of described locking device (7) by four-way change-over valve and oil supply loop with unload oil return line and be connected; Described locking device (7) is when locking state, and described wedged hole (71) is cavity (73) fuel feeding of end greatly.
7. the hydraulic jack as described in claim 1 to 6 any one, is characterized in that, all has baffle plate (74) in two described cavitys (73), and two described baffle plates (74) all contact with the end of described wedge shape part (72).
8. a hydraulic jack, comprise piston (1) and piston rod (2), it is characterized in that, also comprise locking device (7), described locking device (7) has wedged hole (71) and at least two wedge shape parts (72) that coordinate with described wedged hole (71); Described locking device (7) is sleeved on described piston rod (2) by described wedged hole (71), the two ends of described wedged hole (71) all have cavity (73), and described wedge shape part (72) is positioned between described piston rod (2) and described wedged hole (71); Described locking device (7) is when locking state, and described wedge shape part (72) is stuck between described piston rod (2) and described wedged hole (71) and has large end towards the movement tendency of small end;
Two described cavitys (73) of described locking device (7) by four-way change-over valve and oil supply loop with unload oil return line and be connected; Described locking device (7) is when locking state, and described wedged hole (71) is cavity (73) fuel feeding of end greatly.
9. a hydraulic system, comprises oil hydraulic pump and hydraulic jack, it is characterized in that, described hydraulic jack is the hydraulic jack described in claim 1 to 8 any one.
10. an engineering machinery, comprises and lifts high lift platform and hydraulic system thereof, and it is characterized in that, described hydraulic system is hydraulic system claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110433240.7A CN102425586B (en) | 2011-12-21 | 2011-12-21 | Hydraulic cylinder, hydraulic system and engineering machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110433240.7A CN102425586B (en) | 2011-12-21 | 2011-12-21 | Hydraulic cylinder, hydraulic system and engineering machine |
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| Publication Number | Publication Date |
|---|---|
| CN102425586A CN102425586A (en) | 2012-04-25 |
| CN102425586B true CN102425586B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110433240.7A Active CN102425586B (en) | 2011-12-21 | 2011-12-21 | Hydraulic cylinder, hydraulic system and engineering machine |
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| CN103523214A (en) * | 2012-07-06 | 2014-01-22 | 哈尔滨飞机工业集团有限责任公司 | Internal locking device of actuating cylinder |
| CN102840191B (en) * | 2012-09-19 | 2015-06-17 | 中国电建集团中南勘测设计研究院有限公司 | Oil cylinder locking device |
| CN104088833A (en) * | 2014-07-06 | 2014-10-08 | 上海宏信设备工程有限公司 | Power supply and hydraulic redundancy oblique cone self-locking axial force compensation system |
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| CN110294065B (en) * | 2019-04-30 | 2020-09-22 | 武汉船用机械有限责任公司 | Load test tool |
| CN112853064B (en) * | 2021-01-08 | 2024-05-28 | 宁夏机械研究院股份有限公司 | Quick-change and state switching device for die |
| CN113048118B (en) * | 2021-03-24 | 2022-02-18 | 大连理工大学 | Hydraulic supporting device for adjusting attack angle |
| CN113565830B (en) * | 2021-08-25 | 2023-09-19 | 重庆众颖熙科技有限公司 | Single-acting hydraulic cylinder |
| CN113530916A (en) * | 2021-08-25 | 2021-10-22 | 马庆国 | Single-acting supporting hydraulic cylinder |
| CN113530915A (en) * | 2021-08-25 | 2021-10-22 | 马庆国 | Self-locking type single-action hydraulic cylinder |
| CN117249145B (en) * | 2023-11-17 | 2024-02-02 | 常州市振跃液压机械有限公司 | Hydraulic cylinder with mechanical locking function |
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Effective date of registration: 20170214 Address after: 221004 Jiangsu Province, Xuzhou City Yunlong District No. 165 Patentee after: Xugong fire safety equipment Co. Ltd. Address before: 221004 Xuzhou, Zhejiang Province, Jiangsu Road No. 165 Patentee before: Xuzhou Heavy Machinery Co., Ltd. |