CN104454781A - Locking oil cylinder, oil cylinder control system, climbing fire truck or fire-fighting operation vehicle - Google Patents
Locking oil cylinder, oil cylinder control system, climbing fire truck or fire-fighting operation vehicle Download PDFInfo
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- CN104454781A CN104454781A CN201410612754.2A CN201410612754A CN104454781A CN 104454781 A CN104454781 A CN 104454781A CN 201410612754 A CN201410612754 A CN 201410612754A CN 104454781 A CN104454781 A CN 104454781A
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- 230000009194 climbing Effects 0.000 title abstract 3
- 239000003921 oil Substances 0.000 claims description 251
- 239000012530 fluid Substances 0.000 claims description 25
- 239000010720 hydraulic oil Substances 0.000 claims description 14
- 239000000945 filler Substances 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 13
- 230000009471 action Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C27/00—Fire-fighting land vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B2015/268—Fluid supply for locking or release independent of actuator pressurisation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Actuator (AREA)
Abstract
The invention discloses a locking oil cylinder, an oil cylinder control system, a climbing fire truck or a fire fighting operation vehicle, wherein a piston (1) is arranged at the inner end of a piston rod (2) of the locking oil cylinder, the outer end of the piston rod penetrates through a guide sleeve (3) and extends out of a cylinder barrel, the locking oil cylinder (100) further comprises an elastic plunger (6) arranged on the cylinder barrel and a locking rod (5) positioned in the cylinder barrel, one end of the locking rod is hinged to the guide sleeve, the other end of the locking rod is provided with a locking hook, a corresponding clamping groove (11) is formed in the piston, a plunger rod (61) of the elastic plunger extends into the cylinder barrel and is hinged with the locking hook end of the locking rod, and the plunger rod can. The mechanical locking mechanism is adopted, the locking or unlocking control of the oil cylinder can be realized by jointly controlling the extension and retraction of the plunger rod through the plunger control valve unit (30) and the on-off valve (40), the operation and the control are convenient, and the operation safety of the climbing fire truck or the fire-fighting operation truck can be improved.
Description
Technical field
The invention belongs to and relate to a kind of oil cylinder and control system thereof, especially there is the amplitude oil cylinder of locking function, and there is truck or the fire-fighting operation car of this amplitude oil cylinder.
Background technique
Truck or fire-fighting operation car are usually used in high-amplitude high-lift operation, such as, debug wind-driven generator in the high-altitude more than 70 meters or carry out high building fire fighting fire extinguishing.Now, under the effect of amplitude oil cylinder, jib hoists and stretches out from car body, carries out Job Operations in the working bucket that staff or fire fighter stand in jib top.
Wherein, carry out pitching motion primarily of amplitude oil cylinder supporting arm frame and jib and working bucket are locked in operations specific position.And such as more than the high-altitude of 70 meters, wind-force is comparatively large on the impact of jib, be finally converted into the active force to amplitude oil cylinder.Because hydraulic oil has compressive characteristics, under the action of the forces of the wind, the piston rod of amplitude oil cylinder just may move back and forth within the specific limits.When the piston rod being in jib bottom moves back and forth several millimeters, the range of movement of the working bucket on jib top just can be amplified to even tens times, and the staff in working bucket is obviously increased from the sense of insecurity rocked in the high-altitude of tens meters.Therefore, the lock function of amplitude oil cylinder is very important.
Usually, in order to ensure work safety and the stability of vehicle, in the rodless cavity joint of amplitude oil cylinder, equilibrium valve is housed.Stretch out when amplitude oil cylinder and put in place, after stopping passing into pressure oil, hydraulic oil is enclosed in rodless cavity by equilibrium valve automatically, prevents amplitude oil cylinder piston rod from bouncing back.But the sealing effect of described equilibrium valve is also nisi, when equilibrium valve produces leakage in a small amount, amplitude oil cylinder all can produce retraction, thus adds the insecurity of vehicle.
Summary of the invention
The object of this invention is to provide a kind of locking cylinder, cylinder control system, truck or fire-fighting operation car, greatly can improve the locking property of oil cylinder, easy-to-operat and control, increase the operational security of truck or fire-fighting operation car.
For achieving the above object, according to a first aspect of the invention, provide a kind of locking cylinder, comprise cylinder barrel, piston, piston rod and guide sleeve, the inner of piston rod connects piston, outer end is stretched out outside cylinder barrel through guide sleeve, this locking cylinder also comprises the resilient plunger be installed on cylinder barrel and the locking bar being positioned at cylinder barrel, one end of locking bar is articulated with guide sleeve, the other end is formed with latch hook, piston is formed with corresponding draw-in groove, the plunger rod of resilient plunger to stretch in cylinder barrel and hinged with the latch hook end of locking bar, wherein, moving at described piston makes described draw-in groove and described latch hook on time, described resilient plunger can by driving described plunger rod to be with moveable lock hook to be locked in draw-in groove or to exit this draw-in groove.
Preferably, piston and/or latch hook are formed with the guiding surface guiding latch hook to enter draw-in groove.
Preferably, locking cylinder comprises multiple resilient plunger and multiple locking bar one to one, and draw-in groove is the annular recess be formed on the outer circumferential face of piston, and on the outer circumferential face that multiple resilient plunger is arranged on cylinder barrel and circumferentially interval is arranged.
Preferably, resilient plunger comprises plunger rod, spring and plunger case, the inner chamber of plunger case is divided into plunger rodless cavity and plunger rod chamber by the plunger portion of plunger rod, in plunger rodless cavity, one end of plunger rod is supported on the bottom of plunger case by spring, the other end of plunger rod is protruding and hinged with latch hook end through plunger rod chamber.
Preferably, the tubular end cap that cylinder barrel comprises cylinder body and is connected with this cylinder body, guide sleeve is arranged in tubular end cap, resilient plunger is arranged on the periphery wall of tubular end cap, and described plunger rod to stretch in this tubular end cap along the radial direction of described tubular end cap and the described latch hook end of described locking bar can be driven to move radially towards described piston rod.
According to a second aspect of the invention, provide a kind of cylinder control system, comprise the locking cylinder above-mentioned according to the present invention, this system also comprises main reversing valve, plunger control valve unit and on-off valve;
Wherein, the cylinder barrel of locking cylinder is provided with rodless cavity interface and rod chamber interface, main reversing valve comprises filler opening, return opening, the first actuator port and the second actuator port, be connected with oil cylinder rodless cavity working oil path between first actuator port and rodless cavity interface, between the second actuator port and rod chamber interface, be connected with cylinder rod chamber working oil path;
On-off valve is arranged in cylinder rod chamber working oil path;
Plunger rod chamber oil circuit is connected with between the plunger rod chamber of resilient plunger and the second actuator port, the plunger rodless cavity of resilient plunger is connected with plunger rodless cavity oil return circuit, plunger control valve unit to be arranged in plunger rod chamber oil circuit and plunger rodless cavity oil return circuit and to have two kinds of state of a controls, under the first state of a control, plunger rod chamber oil circuit and the conducting separately of plunger rodless cavity oil return circuit, under the second state of a control, the conducting of plunger rodless cavity oil return circuit, plunger rod chamber oil circuit disconnects, and plunger rod chamber is communicated with plunger rodless cavity oil return circuit.
Preferably, on-off valve is Pilot operated check valve or Pilot operated check valve group, the oil circuit control attachment post plug rod chamber of this Pilot operated check valve or Pilot operated check valve group, oil circuit control can reverse-conducting Pilot operated check valve or Pilot operated check valve group when passing into pressure oil, makes the hydraulic oil in cylinder rod chamber working oil path can from the second actuator port reverse circulated to rod chamber interface.
Preferably, be provided with equilibrium valve in oil cylinder rodless cavity working oil path, the hydraulic control oil pocket oil circuit of this equilibrium valve is connected to rod chamber interface.
Preferably, plunger control valve unit be selector valve at least comprising be connected with the plunger rod chamber of resilient plunger first switch hydraulic fluid port and be connected with plunger rodless cavity second switch hydraulic fluid port, the filler opening of plunger control valve unit is connected with the second actuator port of main reversing valve, the return opening oil return of plunger control valve unit;
Wherein, selector valve at least comprises the first commutation position corresponding to the first state of a control and the second commutation position corresponding to the second state of a control, in the first commutation position, first switching hydraulic fluid port is communicated with the filler opening of plunger control valve unit, second switching hydraulic fluid port is communicated with the return opening of plunger control valve unit, in the second commutation position, the first filler opening switching hydraulic fluid port and plunger control valve unit disconnects, and the first switching hydraulic fluid port and second switches the return opening that hydraulic fluid port is communicated with plunger control valve unit respectively.
Preferably, plunger control valve unit comprises the first switch valve and second switch valve, first switch valve is arranged in the connection oil circuit between plunger rod chamber oil circuit and plunger rodless cavity oil return circuit, and second switch valve to be arranged in plunger rod chamber oil circuit and at the second actuator port and the first switch valve between the tie point in plunger rod chamber oil circuit.
Preferably, the cylinder barrel of locking cylinder is also provided with the rod chamber satellite interface that can be communicated with cylinder rod chamber, this rod chamber satellite interface is arranged between rod chamber interface with rodless cavity interface and oil circuit is connected described second actuator port, when piston rod extend out to latch hook is locked in draw-in groove time, piston shutoff rod chamber satellite interface.
Preferably, rod chamber satellite interface comprises the multiple oil throughs be disposed on the perisporium of cylinder barrel, and the aperture of this oil through is not more than 2mm.
According to a third aspect of the invention we, provide a kind of truck or fire-fighting operation car, the jib comprising car body and stretch out from this car body, this truck or fire-fighting operation car also comprise the cylinder control system above-mentioned according to the present invention, and the locking cylinder of this cylinder control system is arranged between car body and jib as amplitude oil cylinder.
Preferably, jib also comprises more piece joint arm hinged successively, and locking cylinder is also arranged between two adjacent joint joint arms as amplitude oil cylinder.
According to technique scheme, mechanical lock mechanism is have employed in locking cylinder of the present invention, namely resilient plunger and locking bar has been set up especially, the latch hook end of locking bar can be locked in the draw-in groove on piston under the plunger rod effect of resilient plunger, forms the safe and reliable locking position to piston rod.For locking or the solution lock control of locking cylinder, to stretch in conjunction with the plunger rod of on-off valve co-controlling resilient plunger by plunger control valve unit and realize, operation and controlling is convenient, when this locking cylinder is applied to truck or fire-fighting operation car, greatly can increase the job safety performance of vehicle.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the sectional view of the locking cylinder according to the preferred embodiment of the present invention;
Fig. 2 is the view when locking bar in the locking cylinder shown in Fig. 1 slides on the guiding surface of piston;
Fig. 3 is the view when locking bar in the locking cylinder shown in Fig. 1 slips into the draw-in groove of piston;
Fig. 4 is the process schematic of a kind of assembly process of the locking cylinder structure shown in Fig. 1;
Fig. 5 is the A-A sectional view in Fig. 1;
Fig. 6 is the B-B sectional view in Fig. 1;
Fig. 7 is the structural representation of the locking bar in the locking cylinder shown in Fig. 1;
Fig. 8 is the structural representation of the guide sleeve in the locking cylinder shown in Fig. 1;
Fig. 9 is the hydraulic schematic diagram of the cylinder control system according to the preferred embodiment of the present invention, and wherein, piston rod bounces back to cylinder base;
Figure 10 is a kind of structural representation of plunger control valve unit of preferred composition form;
Figure 11 and Fig. 9 is similar, unlike, piston rod wherein starts protruding, and in figure, arrow represents the hydraulic oil flow direction, lower same;
Figure 12 and Fig. 9 is similar, unlike, piston rod wherein protrudes outwardly to cylinder body top, piston shutoff rod chamber satellite interface K;
Figure 13 and Fig. 9 is similar, unlike, piston rod wherein bounces back from cylinder body top, now piston still shutoff rod chamber satellite interface K;
Figure 14 and Figure 13 is similar, unlike, piston rod continues retraction, makes piston no longer shutoff rod chamber satellite interface K;
Figure 15 and Figure 14 is similar, unlike, piston rod continues to cylinder bottom retraction, and the plunger control valve unit in figure switches to right position, and make two plunger cavities oil return simultaneously of resilient plunger, plunger rod resets;
Figure 16 be piston rod protruding time piston shutoff rod chamber satellite interface K view;
Figure 17 be Z-Z in Figure 16 to partial schematic diagram, illustrate shape and the structure of the rod chamber satellite interface K after the welding lid eliminating and be welded on cylinder body;
Figure 18 is piston rod moves to maximum locking cylinder when stretching out travel position partial structurtes schematic diagram at cylinder body top;
Figure 19 is the structural representation of truck according to the preferred embodiment of the present invention or fire-fighting operation car;
Figure 20 is the enlarged diagram enclosing part at the jib top in Figure 19.
description of reference numerals
1 piston 2 piston rod
3 guide sleeve 4 tubular end caps
5 locking bar 6 resilient plunger
7 cylinder bodies
11 draw-in groove 12 guiding surfaces
20 main reversing valve 30 plunger control valve unit
31 first switch valve 32 second switch valves
40 on-off valve 50 equilibrium valves
61 plunger rod 62 springs
63 plunger case 64 plunger guide covers
100 locking cylinder 200 car bodies
300 jib 400 working buckets
W rodless cavity interface V rod chamber interface
K rod chamber satellite interface K1 oil through
P filler opening T return opening
J gap
A1 first actuator port A2 second actuator port
B1 first switches hydraulic fluid port B2 second and switches hydraulic fluid port
L1 oil cylinder rodless cavity working oil path L2 cylinder rod chamber working oil path
L3 plunger rod chamber oil circuit L4 plunger rodless cavity oil return circuit
L5 oil circuit control L6 equilibrium valve external control oil circuit
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, when not doing contrary explanation, the noun of locality used is if " upper and lower " is normally for direction shown in the drawings, or for vertically, on vertical or gravitational direction, or each parts mutual alignment relationship description word of dependency structure equipment under normal operating condition; Similarly, for ease of understanding and describing, " left and right " is normally for shown in the drawings left and right; " inside and outside " refers to profile inside and outside relative to each parts itself, but the above-mentioned noun of locality is not limited to the present invention.
The present invention provide firstly a kind of locking cylinder, and as shown in Figure 1, this locking cylinder comprises cylinder barrel, piston 1, piston rod 2 and guide sleeve 3, and the inner of piston rod 2 connects or is provided with piston 1, and outer end is stretched out outside cylinder barrel through guide sleeve 3; This locking cylinder 100 also comprises the resilient plunger 6 be installed on cylinder barrel and the locking bar 5 being positioned at cylinder barrel, one end of locking bar 5 is articulated with guide sleeve 3, the other end is formed with latch hook, piston 1 is formed with corresponding draw-in groove 11, the plunger rod 61 of resilient plunger 6 to stretch in cylinder barrel and hinged with the latch hook end of locking bar 5; Wherein, move at piston 1 and make draw-in groove 11 and latch hook on time, resilient plunger 6 can by drive plunger rod 61 to be with moveable lock hook to be locked in draw-in groove 11 or to exit this draw-in groove 11.
As total inventive concept, the present invention is intended to reveal for the fluid that may bring when being locked by the hydraulic oil of hydraulic valve piece to the rodless cavity of oil cylinder in prior art, thus lock insecure problem, devise the mechanical type closure structure comprising locking bar 5, resilient plunger 6 and draw-in groove 11 especially, to form the safe and reliable mechanical type locking to piston rod 2.Realize locking to piston rod 2 or unblock by the extension and contraction control of the plunger rod 61 to resilient plunger 6, can in conjunction with the pressure oil of hydraulic control system introducing oil cylinder, carry out hydraulic control to resilient plunger 6, operation and controlling is convenient.When locking cylinder with mechanical type closure structure is used as amplitude oil cylinder, locking is reliable, and luffing jib not easily produces displacement in locked position or rocks, and can greatly increase job safety performance.
In the present embodiment, the cylinder barrel of locking cylinder is designed to Split type structure, to utilize assembling, below will address.This cylinder barrel comprises cylinder body 7 and the tubular end cap 4 of (being such as weldingly connected) that is connected with this cylinder body 7, and guide sleeve 3 is arranged in tubular end cap 4, and resilient plunger 6 is arranged on the periphery wall of tubular end cap 4.Certainly, cylinder body 7 and tubular end cap 4 also can form as one the cylinder barrel of structure.
Fig. 7, Fig. 8 are respectively the stereogram of locking bar 5 in present embodiment and guide sleeve 3, and one end of locking bar 5 is provided with pin-and-hole, and the other end (i.e. latch hook end) is formed with hinged seat, and guide sleeve 3 is also formed with hinged seat.Shown in composition graphs 6, the pin-and-hole end of locking bar 5 is connected to the hinged seat on guide sleeve 3 pivotly by bearing pin, the two ends of described bearing pin have limit structure.Similarly, as shown in Figure 5, the bottom of the plunger rod 61 of the vertical direction in figure is connected to the hinged seat of the latch hook end of locking bar 5 pivotly by bearing pin.By said structure, when the plunger rod 61 in Fig. 1 and Fig. 5 moves up and down, the latch hook of locking bar 5 can be driven to enter or exit draw-in groove 11.
Wherein, piston 1 and piston rod 2 are moving axially along cylinder body, this moves axially and independently carries out separately with moving up and down of plunger rod 61, needs to prevent locking bar 5 from producing unnecessary mechanical interference with piston 1 or piston rod 2, and guarantees that latch hook successfully enters or exits draw-in groove 11.For this reason, devise guide structure especially, such as, on piston 1 and/or latch hook, form the guiding surface 12 guiding latch hook to enter draw-in groove 11.As shown in Figure 1, guiding surface 12 is formed on piston 1, and along on the vertical direction (radial direction of the locking cylinder 100 namely in Fig. 1 or the axis of resilient plunger 6) in figure, the minimum point of guiding surface 12 is not higher than the lowest point of latch hook, like this piston 1 near latch hook time, latch hook head-on contacts the low dot location of guiding surface 12, and rise along guiding surface 12 as illustrated in fig. 2, climb Compress Spring 62 simultaneously, until the locked position that latch hook aligns with draw-in groove 11, under the restoring force effect of spring 62, latch hook to fall in draw-in groove 11 and remains in this draw-in groove 11 under downward spring-force driven dual, as shown in Figure 3, form the locking to piston 1.When unlocking, then overcome the down pressure of spring 62 by External Force Acting (such as the following hydraulic coupling that will describe), upwards promoted by plunger rod 61, depart from draw-in groove 11, piston rod 2 bounces back simultaneously, and latch hook no longer aligns with draw-in groove 11, completes unblock.Those skilled in the art, it is understood that the bottom of latch hook can be designed with pulley, are beneficial to the slip on guiding surface 12, and guiding surface 12 also can be formed in the bottom of latch hook.
Piston 1, piston rod 2 and cylinder barrel are generally cylindrical, therefore for forming more firm locking, this locking cylinder 100 comprises multiple resilient plunger 6 and multiple locking bar 5 one to one, draw-in groove 11 is for being formed in the annular recess on the outer circumferential face of piston 1, and on the outer circumferential face that multiple resilient plunger 6 is arranged on cylinder barrel and circumferentially interval is arranged.Like this, along under the spaced apart multiple latch hook of circumference of cylinder barrel and the common lock function of draw-in groove 11, more firm locking is formed to piston rod 2.In the present embodiment, exemplarily, two symmetrical resilient plunger 6 and two locking bars 5 of correspondence thereof are arranged.
Specific to resilient plunger 6, as a kind of preferred structure, as shown in Figure 1, this resilient plunger 6 comprises plunger rod 61, spring 62 and plunger case 63, the outer circumferential face of the plunger portion of plunger rod 61 and the inner peripheral surface of plunger case 63 form side face and seal, and the inner chamber of plunger case 63 is divided into plunger rodless cavity and plunger rod chamber by plunger portion.In plunger rodless cavity, one end of plunger rod 61 by spring 62 (Fig. 1 is preferably Compress Spring) elastic support in the bottom of plunger case 63, in other words, the two ends difference elastic support of spring 62 is between the plunger portion and the bottom of plunger case 63 of plunger rod 61, and the other end of plunger rod 61 is protruding and hinged with latch hook end through plunger rod chamber.On the basis of this resilient plunger structure, when plunger rodless cavity and plunger rod chamber all do not pass into pressure oil (or oil return), then Compress Spring promotion plunger rod 61 stretches out downwards for locking, until plunger portion is locked on plunger guide cover 64.And when plunger rod chamber passes into pressure oil, then can overcome the elastic pressure of spring 62, promote plunger rod 61 and move up for unlocking.Like this, namely resilient plunger 6 is driven to control locking to piston rod 2 or unblock by design plunger hydraulic loop.
Fig. 4 is the process schematic of a kind of assembly process of the locking cylinder structure shown in Fig. 1.Shown in composition graphs 1 and Fig. 4, first by hinged to guide sleeve 3 and locking bar 5, then guide sleeve 3 is assembled to the right-hand member of tubular end cap 4 by fastening piece.Afterwards, resilient plunger 6 64 to be installed on the peripheral part of tubular end cap 4 by plunger guide cover, and the latch hook end of locking bar 5 and the plunger rod 61 of resilient plunger 6 are assembled, in the ellipse in formation Fig. 4, enclose part.The right-hand member peripheral part of cylinder body 7 is welded to connect cover for seat, encloses part and be arranged on described connecting base by fastening pieces such as screws as a whole and put, thus complete the assembling of whole locking cylinder.Similarly, this assembling mode also not exclusive mode, such as tubular end cap 4 can be welded direct to the right-hand member of cylinder body 7, also by independently end cap, guide sleeve 3 is fixedly installed on the right side of tubular end cap 4, in the scope that those skilled in the art can understand, various change design can be carried out.
The foregoing describe the structure of the locking cylinder of a preferred embodiment of the invention, to specifically set forth cylinder control system and the composition thereof of a kind of preferred implementation of this locking cylinder 100 below, and the piston rod of locking cylinder stretches out with in retraction process, the control of the system liquid force feed flow direction and each hydraulic element, to realize the locking of corresponding piston rod and to unlock.
As shown in Figure 9, this cylinder control system comprises main reversing valve 20, plunger control valve unit 30 and on-off valve 40;
Wherein, the cylinder barrel of locking cylinder is provided with rodless cavity interface W and rod chamber interface V, main reversing valve 20 comprises oil inlet P, oil return inlet T, the first actuator port A1 and the second actuator port A2, be connected with oil cylinder rodless cavity working oil path L1 between first actuator port A1 and rodless cavity interface W, between the second actuator port A2 and rod chamber interface V, be connected with cylinder rod chamber working oil path L2;
On-off valve 40 is arranged in cylinder rod chamber working oil path L2;
Plunger rod chamber oil circuit L3 is connected with between the plunger rod chamber of resilient plunger 6 and the second actuator port A2, the plunger rodless cavity (i.e. piston spring chamber) of resilient plunger 6 is connected with plunger rodless cavity oil return circuit L4, plunger control valve unit 30 to be arranged in plunger rod chamber oil circuit L3 and plunger rodless cavity oil return circuit L4 and to have two kinds of state of a controls, under the first state of a control, plunger rod chamber oil circuit L3 and plunger rodless cavity oil return circuit L4 conducting separately; Under the second state of a control, plunger rodless cavity oil return circuit L4 conducting, plunger rod chamber oil circuit L3 disconnects, and plunger rod chamber is communicated with plunger rodless cavity oil return circuit L4.
In this cylinder control system, main reversing valve 20 is the common hydraulic element of oil cylinder hydraulic system, switches flow to oil cylinder rodless cavity or cylinder rod chamber, stretching out or bouncing back with control piston bar 2 for making pressure oil.Plunger control valve unit 30, for controlling resilient plunger 6, makes the plunger rod 61 of resilient plunger 6 stretch, thus realizes locking or unlock.On-off valve 40 is arranged in cylinder rod chamber working oil path L2, be mainly used in piston rod 2 from maximum stretch out travel position bounce back time, first block cylinder rod chamber working oil path L2, prevent pressure oil from taking the lead in being full of cylinder rod chamber, make to be formed between latch hook and draw-in groove 11 stuck, plunger rod 61 is difficult to retraction and unlocks.In other words, when piston rod 2 bounces back, first should remove mechanical caging, then on-off valve 40 closes, cylinder rod chamber working oil path L2 conducting, and pressure oil enters cylinder rod chamber, promotes piston rod 2 and bounces back.
As is illustrated by figs. 11 and 12, when piston rod 2 stretches out, rodless cavity interface W passes into pressure oil, and rod chamber interface V is by cylinder rod chamber working oil path L2 oil return, and two chambeies of resilient plunger 6 all can oil return, makes plunger rod 61 be in the original state of stretching out.When piston rod 2 bounces back, as shown in figure 18, piston rod 2 is first excessive stretches out certain allowance (the gap J namely in Figure 18), sheds the pressure of piston rod 2 pairs of latch hooks, first pressure oil pass into plunger rod chamber, remove latch hook to the locking of piston rod 2, then pass into cylinder rod chamber again, promote piston rod 2 and bounce back, oil cylinder rodless cavity oil return, thus roughly realize stretching out and the overall process that bounces back of piston rod 2, and corresponding the locking and unlocking function, also will set forth further below.
The following describes the design of each main hydraulic.Wherein, on-off valve 40 controls for the break-make of cylinder rod chamber working oil path L2, and arranging on-off valve 40 is pass into sequencing problem for the pressure oil solved when piston rod 2 bounces back, and it can be the various ways such as electromagnetic switch valve or Pilot operated check valve.When adopting electromagnetic switch valve, certain time-delay can be designed, when piston rod 2 needs retraction, after plunger control valve unit 30 action of resilient plunger 6 to be controlled, unblock completes, as the electromagnetic switch valve action again of on-off valve 40, and conducting cylinder rod chamber working oil path L2.In the present embodiment, on-off valve 40 is preferably Pilot operated check valve or the Pilot operated check valve group be connected in series by multiple Pilot operated check valve as shown in Figure 9, the oil circuit control L5 attachment post plug rod chamber of this Pilot operated check valve or Pilot operated check valve group, oil circuit control L5 can reverse-conducting Pilot operated check valve or Pilot operated check valve group when passing into pressure oil, makes the hydraulic oil in cylinder rod chamber working oil path L2 can from the second actuator port A2 reverse circulated to rod chamber interface V.Like this, when piston rod 2 needs retraction, under making plunger control valve unit 30 be in its first state of a control, plunger rod chamber oil circuit L3 conducting, plunger rod chamber passes into pressure oil, and plunger rod 61 is forced to retraction, completes unblock.Simultaneously, the pressure oil of plunger rod chamber enters oil circuit control L5, makes Pilot operated check valve reverse-conducting, and cylinder rod chamber working oil path L2 is also with regard to conducting, the pressure oil that second actuator port A2 flows out enters rod chamber interface V by cylinder rod chamber working oil path L2, promotes piston rod 2 and bounces back.
Those skilled in the art, it is understood that plunger control valve unit 30 is for realizing two kinds of state of a controls, can have various structures form equally.Only exemplarily, can be the single valve block structure shown in Fig. 9, or valve block structure as shown in Figure 10.
As shown in Figure 9, plunger control valve unit 30 be wherein selector valve at least comprising be connected with the plunger rod chamber of resilient plunger 6 first switch hydraulic fluid port B1 and be connected with plunger rodless cavity second switch hydraulic fluid port B2, the filler opening of plunger control valve unit 30 is connected with the second actuator port A2 of main reversing valve 20, and the return opening of plunger control valve unit 30 is to system oil tank drainback.Wherein, this selector valve at least comprises the first commutation position corresponding to described first state of a control and the second commutation position corresponding to described second state of a control, in the first commutation position, first switching hydraulic fluid port B1 is communicated with the filler opening of plunger control valve unit 30, second switching hydraulic fluid port B2 is communicated with the return opening of plunger control valve unit 30, in the second commutation position, first filler opening switching hydraulic fluid port B1 and plunger control valve unit 30 disconnects, and the first switching hydraulic fluid port B1 and second switches the return opening that hydraulic fluid port B2 is communicated with plunger control valve unit 30 respectively.Namely selector valve at least forms two shown in Fig. 9 commutation position and hydraulic fluid port annexation thereof.Comparatively simple and preferred, be the two-position four way change valve shown in Fig. 9.
Figure 10 is the structural representation of the another kind of preferably plunger control valve unit 30 of composition form.Plunger control valve unit 30 is wherein valve group and comprises the first switch valve 31 and second switch valve 32, first switch valve 31 is arranged in the connection oil circuit between plunger rod chamber oil circuit L3 and plunger rodless cavity oil return circuit L4, and second switch valve 32 to be arranged in plunger rod chamber oil circuit L3 and at the second actuator port A2 and the first switch valve 31 between the tie point in plunger rod chamber oil circuit L3.Obviously, disconnect at the first switch valve 31, during 32 conducting of second switch valve, the first described state of a control can be realized.Disconnect at second switch valve 32, during the first switch valve 31 conducting, the second described state of a control can be realized.
In addition, when piston rod 2 bounces back, for keeping retraction steadily controlled, in oil cylinder rodless cavity working oil path L1, externally controlled type equilibrium valve 50 is also provided with in present embodiment, and especially, the hydraulic control oil pocket oil circuit of this equilibrium valve 50 connects (namely being connected by the equilibrium valve external control oil circuit L6 in Fig. 9) to rod chamber interface V.Like this, piston rod 2 stretch out or lock non-retracted state time, the pressure oil in piston rodless cavity is difficult to by equilibrium valve 50 oil return or leakage.And when piston rod 2 needs retraction, pressure oil in cylinder rod chamber working oil path L2 enters rod chamber interface V, this pressure oil also enters the hydraulic control oil pocket of equilibrium valve 50 simultaneously by equilibrium valve external control oil circuit L6, the relief valve valve port of equilibrium valve 50 is opened, and the pressure oil of oil cylinder rodless cavity is able to by the smooth oil return of oil cylinder rodless cavity working oil path L1.
In addition, as shown in Figure 9, because on-off valve 40 adopts Pilot operated check valve, the plunger rod chamber of its pilot pressure oil sources own elasticity plunger 6.In the retraction process of piston rod 2, Pilot operated check valve needs reverse-conducting always, and pressure oil just can be made to enter cylinder rod chamber always, promotes piston rod 2 and continues retraction.In other words, plunger rod chamber needs to continue to pass into pressure oil.But under plunger rod chamber sustainable existence pressure oil condition, then plunger rod 61 keeps retracted state always, the original state of stretching out can not be reset to, spring 62 is also compressed always, and on long terms, this can produce structural damage beyond doubt for Pilot operated check valve and resilient plunger 6 etc.
Therefore, the cylinder barrel of locking cylinder 100 is also provided with especially the rod chamber satellite interface K that can be communicated with cylinder rod chamber, this rod chamber satellite interface K to be arranged between rod chamber interface V with rodless cavity interface W and be connected to cylinder rod chamber working oil path L2 or directly oil circuit be communicated with the second actuator port A2.Under plunger control valve unit 30 is in its second state of a control, when plunger rod chamber and the equal oil return of plunger rodless cavity, plunger rod 61 and spring 62 all reset, the hydraulic oil also oil return of oil circuit control L5, be difficult to make Pilot operated check valve keep reverse-conducting again, pressure oil is also just difficult to enter rod chamber interface V again by cylinder rod chamber working oil path L2, and the pressure oil that now the second actuator port A2 exports then enters cylinder rod chamber by rod chamber satellite interface K, continues to promote piston rod 2 and bounces back.In addition, in the process that piston rod 2 stretches out, the hydraulic oil of cylinder rod chamber is also by this rod chamber satellite interface K oil return.
But, at releasing process and the retraction initial stage of piston rod 2, as previously mentioned, unlock because needs first control resilient plunger 6, and open equilibrium valve 50, need the pressure oil that the second actuator port A2 is exported to enter cylinder rod chamber by rod chamber interface V, but not enter rod chamber satellite interface K more quickly.Therefore, the position of rod chamber satellite interface K should be designed to: make latch hook be locked in draw-in groove 11 when piston rod 61 extend out to, namely during lock state, piston 1 moves to the position of shutoff rod chamber satellite interface K, as shown in figure 16.Like this, at releasing process and the retraction initial stage of piston rod 2, pressure oil does not all enter cylinder rod chamber by rod chamber satellite interface K, until piston 1 bounces back to cross rod chamber satellite interface K position.Now, the pressure oil that rod chamber satellite interface K passes into promotes piston 1 and piston rod 2 continues retraction.And the pressure oil passing into cylinder rod chamber passes into equilibrium valve external control oil circuit L6 by rod chamber interface V constantly, equilibrium valve 50 constant conduction, does not affect the oil return of oil cylinder rodless cavity.
The design of rod chamber satellite interface K not only comprises position and selects to need to meet above-mentioned requirements, owing to there is dynamic fit relation with piston 1, the side face of piston 1 is generally embedded with the Sealings such as scraper ring, needs to prevent Sealing from producing in rod chamber satellite interface K place in fore and aft motion process and damage.For this reason, as shown in figure 17, special structural design has been carried out to rod chamber satellite interface K.This rod chamber satellite interface K comprises the multiple oil through K1 be disposed on the perisporium of cylinder barrel, and the aperture of this oil through K1 is not more than 2mm.So both guaranteeing to meet the flow by rod chamber satellite interface K, and having ensured again when piston 1 is not by damaging all face seals of piston 1 during each oil through K1.After the rod chamber satellite interface K place soldering oil lid of cylinder body periphery wall, this rod chamber satellite interface K can external connected pipes.
On the hydraulic element composition of above-mentioned locking cylinder control system and the basis of oil passage connection structure, below in conjunction with Figure 11 to Figure 15 and Figure 18, and for the cylinder control system according to the preferred embodiment of the present invention shown in Fig. 9, the operation of the telescopic process of locking cylinder wherein and each control unit of control system is described.Wherein, the piston rod in Fig. 9 bounces back to cylinder base; Figure 11 to Figure 15 is all similar with Fig. 9, represents the overall process that piston rod stretches out and bounces back, unlike, the piston rod in Figure 11 starts protruding, and in figure, arrow represents the hydraulic oil flow direction, lower same; Piston rod in Figure 12 protrudes outwardly to cylinder body top, piston shutoff rod chamber satellite interface K; Piston rod in Figure 13 bounces back from cylinder body top, now piston still shutoff rod chamber satellite interface K; Piston rod in Figure 14 continues retraction, makes piston no longer shutoff rod chamber satellite interface K; Piston rod in Figure 15 continues to cylinder bottom retraction, and the plunger control valve unit in figure switches to right position, and make two plunger cavities oil return simultaneously of resilient plunger, plunger rod resets.
In fig .9, the piston rod 2 of locking cylinder bounces back to cylinder base, main reversing valve 20 is in meta, oil cylinder rodless cavity working oil path L1 and the equal oil return of cylinder rod chamber working oil path L2, plunger control valve unit 30 is in right position, the plunger rod chamber of resilient plunger 6 and the equal oil return of plunger rodless cavity, plunger rod 61 stretches out towards piston rod 2 under the action of the spring 62, is in the original state of stretching out.
See Figure 11, piston rod 2 progressively stretches out.Now, plunger control valve unit 30 is still in right position, the left end electromagnet of main reversing valve 20 obtains electric, switch to left position, oil cylinder rodless cavity working oil path L1 passes into pressure oil, the one-way valve of this pressure oil in equilibrium valve 50 flows into rodless cavity interface W, promotes piston rod 2 and protrude upward in oil cylinder rodless cavity.Simultaneously, owing to there is Pilot operated check valve in cylinder rod chamber working oil path L2, there is certain back pressure, and oil circuit path is longer, although cylinder rod chamber working oil path L2 is on state, the hydraulic oil in cylinder rod chamber is more mainly by rod chamber satellite interface K oil return.
See Figure 12, piston rod 2 extend out to piston 1 further and hides rod chamber satellite interface K, state as shown in figure 16.Now, main reversing valve 20 is still in left position, and plunger control valve unit 30 is still in right position, and the hydraulic oil in cylinder rod chamber can only by rod chamber interface V via cylinder rod chamber working oil path L2 oil return.
Along with moving up further of piston rod 2, latch hook slips in draw-in groove 11 by guiding surface 12, forms mechanical type locking, prevent piston rod 2 from bouncing back to piston rod 2.
See Figure 13, when piston rod 2 needs retraction, need first to unlock from lock state.Now, the right-hand member electromagnet of main reversing valve 20 obtains electric, switches to right position, passes into pressure oil in cylinder rod chamber working oil path L2, and the left end electromagnet of plunger control valve unit 30 obtains electric simultaneously, switches to left position.Due to the original oil return of plunger rod chamber, on-off valve 40 and cylinder rod chamber working oil path L2 are disconnected, and pressure oil is difficult to enter cylinder rod chamber.The pressure oil that second actuator port A2 of main reversing valve 20 exports enters plunger rod chamber by plunger rod chamber oil circuit L3, promotes plunger rod 61 and bounces back from draw-in groove 11, remove the locking to piston rod 2.Then after plunger rod chamber is full of pressure oil, pressure oil traffic organising oil circuit L5, make Pilot operated check valve reverse-conducting, cylinder rod chamber working oil path L2 is also with regard to conducting, pass into pressure oil by rod chamber interface V to cylinder rod chamber, after unblock, promote piston rod 2 bounce back.Meanwhile, the pressure oil in cylinder rod chamber working oil path L2 opens equilibrium valve 50 by equilibrium valve external control oil circuit L6, makes the hydraulic oil of oil cylinder rodless cavity via the smooth oil return of oil cylinder rodless cavity working oil path L1.If plunger control valve unit 30 remains on left position, then there is pressure oil in plunger rod chamber all the time, Pilot operated check valve is reverse-conducting all the time, pressure oil is able to enter cylinder rod chamber by cylinder rod chamber working oil path L2, and in equilibrium valve external control oil circuit L6, also there is the pressure oil drawn from cylinder rod chamber working oil path L2, oil cylinder rodless cavity working oil path L1 can be made to keep smooth oil return.
It should be noted that, before preparation retract piston bar 2, namely in the Figure 12 before Figure 13, need main reversing valve 20 and plunger control valve unit 30 to keep original position, hydraulic oil enters oil cylinder rodless cavity and gets rid of presses a few second, piston rod 2 is extend out to and maximumly stretches out travel position, piston 1, against guide sleeve 3, as shown in figure 18, forms a little axial clearance J between latch hook and draw-in groove 11 sidewall, remove the lateral pressure between latch hook and draw-in groove 11, facilitate exiting of latch hook.Like this, then carry out the unblock retracting action shown in Figure 13, namely by switching controls plunger control valve unit 30, make plunger rod 61 be with moveable lock hook to exit draw-in groove 11, complete unblock smoothly.
In fig. 14, piston rod 2 continues retraction, until piston 1 no longer hides rod chamber satellite interface K, the pressure oil that now the second actuator port A2 of main reversing valve 20 exports directly more can enter cylinder rod chamber by rod chamber satellite interface K.Wherein, plunger control valve unit 30 still remains on left position, and cylinder rod chamber working oil path L2 keeps reverse-conducting, and partial pressure oil flows to cylinder rod chamber by rod chamber interface V.
And then, in fig .15, when piston rod 2 crosses rod chamber satellite interface K continuation retraction from piston 1, plunger control valve unit 30 can switch to right position, plunger rod chamber and the equal oil return of plunger rodless cavity, and spring 62 resets, and plunger rod 61 resets and stretches out.Like this, Pilot operated check valve is reverse-conducting no longer, and cylinder rod chamber working oil path L2 disconnects, and the pressure oil that the second actuator port A2 exports enters cylinder rod chamber by means of only rod chamber satellite interface K.Because equilibrium valve external control oil circuit L6 is communicated with cylinder rod chamber by rod chamber interface V, there is pressure oil all the time in equilibrium valve external control oil circuit L6, oil cylinder rodless cavity working oil path L1 oil return is unimpeded.
It should be noted that, after unblock, realized the reset of resilient plunger 6 by the switching action of plunger control valve unit 30, namely plunger rod 61 is reset to and initial stretches out state under spring 62 acts on.The handover operation of plunger control valve unit 30 to be that piston 1 crosses rod chamber satellite interface K when continuing retraction opportunity.Therefore, when this locked cylinder connects jib to be used as amplitude oil cylinder, after the piston rod retraction certain distance of amplitude oil cylinder, the luffing range of cantilever support angle that the jib angle transducer by vehicle is installed detects converts and judges whether piston 1 crosses rod chamber satellite interface K.And then automatically can provide signal by controller, control plunger control valve unit 30 and switch to right position, the off-load all smoothly of plunger rodless cavity and plunger rod chamber, plunger rod 61 resets under the action of the spring 62, for lock out action is ready next time.
In addition, as shown in figure 19, present invention also offers a kind of truck or fire-fighting operation car, this truck or fire-fighting operation car comprise car body 200, the jib 300 stretched out from this car body 200 and the cylinder control system above-mentioned according to the present invention, and the locking cylinder 100 of this cylinder control system is arranged between car body 200 and jib 300 as amplitude oil cylinder.Wherein, owing to have employed the locking cylinder 100 with mechanical type closure structure, when operator stand in carry out high-lift operation in the working bucket 400 at jib 300 top time, the locking of this locking cylinder 100 pairs of jibs 300 is firm, reveal in a small amount even if the pressure oil in oil cylinder rodless cavity produces, also do not affect locking reliability.Jib 300 and working bucket 400 not easily produce swing, and the operational security of operator is able to better guarantee.
This locking cylinder 100 not only can be supported on car body 200 and use as main amplitude oil cylinder, and the auxiliary amplitude oil cylinder that equally also can be used as between jib uses.As shown in figure 20, jib 300 also preferably includes more piece joint arm hinged successively, and locking cylinder 100 also can be arranged between two adjacent joint joint arms as amplitude oil cylinder, and same acquisition better locks unfailing performance.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant and improvement to technological scheme of the present invention, these simple variant and improvement all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (14)
1. a locking cylinder, comprise cylinder barrel, piston (1), piston rod (2) and guide sleeve (3), the inner of described piston rod (2) connects described piston (1), outer end is stretched out outside described cylinder barrel through described guide sleeve (3), it is characterized in that, described locking cylinder (100) also comprises the resilient plunger (6) be installed on described cylinder barrel and the locking bar (5) being positioned at described cylinder barrel, one end of described locking bar (5) is articulated with described guide sleeve (3), the other end is formed with latch hook, described piston (1) is formed with corresponding draw-in groove (11), the plunger rod (61) of described resilient plunger (6) to stretch in described cylinder barrel and hinged with the latch hook end of described locking bar (5),
Wherein, moving at described piston (1) makes described draw-in groove (11) and described latch hook on time, and described resilient plunger (6) can be locked in described draw-in groove (11) to drive described latch hook or exit this draw-in groove (11) by driving described plunger rod (61).
2. locking cylinder according to claim 1, is characterized in that, described piston (1) and/or described latch hook are formed with the guiding surface (12) guiding described latch hook to enter described draw-in groove (11).
3. locking cylinder according to claim 1, it is characterized in that, described locking cylinder (100) comprises multiple described resilient plunger (6) and multiple described locking bar (5) one to one, described draw-in groove (11) is for being formed in the annular recess on the outer circumferential face of described piston (1), and on the outer circumferential face that multiple described resilient plunger (6) is arranged on described cylinder barrel and circumferentially interval is arranged.
4. locking cylinder according to claim 1, it is characterized in that, described resilient plunger (6) comprises described plunger rod (61), spring (62) and plunger case (63), the inner chamber of described plunger case (63) is divided into plunger rodless cavity and plunger rod chamber by the plunger portion of described plunger rod (61), in described plunger rodless cavity, one end of described plunger rod (61) is by the bottom of described spring (62) elastic support in described plunger case (63), the other end of described plunger rod (61) is protruding and hinged with described latch hook end through described plunger rod chamber.
5. locking cylinder according to claim 1, it is characterized in that, the tubular end cap (4) that described cylinder barrel comprises cylinder body (7) and is connected with this cylinder body (7), described guide sleeve (3) is arranged in described tubular end cap (4), described resilient plunger (6) is arranged on the periphery wall of described tubular end cap (4), and described plunger rod (61) to stretch in this tubular end cap (4) along the radial direction of described tubular end cap (4) and the described latch hook end of described locking bar (5) can be driven to move radially towards described piston rod (2).
6. a cylinder control system, comprise according to the locking cylinder (100) in claim 1-5 described in any one, it is characterized in that, described system also comprises main reversing valve (20), plunger control valve unit (30) and on-off valve (40);
Wherein, the cylinder barrel of described locking cylinder (100) is provided with rodless cavity interface (W) and rod chamber interface (V), described main reversing valve (20) comprises filler opening (P), return opening (T), the first actuator port (A1) and the second actuator port (A2), be connected with oil cylinder rodless cavity working oil path (L1) between described first actuator port (A1) and described rodless cavity interface (W), between described second actuator port (A2) and described rod chamber interface (V), be connected with cylinder rod chamber working oil path (L2);
Described on-off valve (40) is arranged in described cylinder rod chamber working oil path (L2);
Plunger rod chamber oil circuit (L3) is connected with between the plunger rod chamber of described resilient plunger (6) and described second actuator port (A2), the plunger rodless cavity of described resilient plunger (6) is connected with plunger rodless cavity oil return circuit (L4), described plunger control valve unit (30) to be arranged in described plunger rod chamber oil circuit (L3) and plunger rodless cavity oil return circuit (L4) and to have two kinds of state of a controls, under the first state of a control, described plunger rod chamber oil circuit (L3) and plunger rodless cavity oil return circuit (L4) conducting separately, under the second state of a control, the conducting of described plunger rodless cavity oil return circuit (L4), described plunger rod chamber oil circuit (L3) disconnects, described plunger rod chamber is communicated with described plunger rodless cavity oil return circuit (L4).
7. cylinder control system according to claim 6, it is characterized in that, described on-off valve (40) is Pilot operated check valve or Pilot operated check valve group, the oil circuit control (L5) of this Pilot operated check valve or Pilot operated check valve group connects described plunger rod chamber, described oil circuit control (L5) can Pilot operated check valve or Pilot operated check valve group described in reverse-conducting when passing into pressure oil, makes the hydraulic oil in described cylinder rod chamber working oil path (L2) can from described second actuator port (A2) reverse circulated to described rod chamber interface (V).
8. cylinder control system according to claim 7, it is characterized in that, be provided with equilibrium valve (50) in described oil cylinder rodless cavity working oil path (L1), the hydraulic control oil pocket oil circuit of this equilibrium valve (50) is connected to described rod chamber interface (V).
9. cylinder control system according to claim 6, it is characterized in that, described plunger control valve unit (30) for selector valve at least comprising be connected with the described plunger rod chamber of described resilient plunger (6) first switch hydraulic fluid port (B1) and be connected with described plunger rodless cavity second switch hydraulic fluid port (B2), the filler opening of described plunger control valve unit (30) is connected with described second actuator port (A2) of described main reversing valve (20), the return opening oil return of described plunger control valve unit (30);
Wherein, described selector valve at least comprises the first commutation position corresponding to described first state of a control and the second commutation position corresponding to described second state of a control, in described first commutation position, described first switching hydraulic fluid port (B1) is communicated with the filler opening of described plunger control valve unit (30), described second switching hydraulic fluid port (B2) is communicated with the return opening of described plunger control valve unit (30), in described second commutation position, described first switches hydraulic fluid port (B1) disconnects with the filler opening of described plunger control valve unit (30), and described first switching hydraulic fluid port (B1) and described second switches the return opening that hydraulic fluid port (B2) is communicated with described plunger control valve unit (30) respectively.
10. cylinder control system according to claim 6, it is characterized in that, described plunger control valve unit (30) comprises the first switch valve (31) and second switch valve (32), described first switch valve (31) is arranged in the connection oil circuit between described plunger rod chamber oil circuit (L3) and described plunger rodless cavity oil return circuit (L4), described second switch valve (32) to be arranged in described plunger rod chamber oil circuit (L3) and to be arranged in described second actuator port (A2) and described first switch valve (31) between the tie point of described plunger rod chamber oil circuit (L3).
11. cylinder control systems according to claim 6, it is characterized in that, the described cylinder barrel of described locking cylinder (100) is also provided with the rod chamber satellite interface (K) that can be communicated with cylinder rod chamber, this rod chamber satellite interface (K) is arranged between described rod chamber interface (V) with described rodless cavity interface (W) and oil circuit is connected described second actuator port (A2), when described piston rod (61) extend out to make described latch hook be locked in described draw-in groove (11) time, rod chamber satellite interface (K) described in described piston (1) shutoff.
12. cylinder control systems according to claim 11, it is characterized in that, described rod chamber satellite interface (K) comprise be disposed on described cylinder barrel perisporium on multiple oil throughs (K1), the aperture of this oil through (K1) is not more than 2mm.
13. 1 kinds of trucks or fire-fighting operation car, the jib (300) comprising car body (200) and stretch out from this car body (200), it is characterized in that, described truck or fire-fighting operation car also comprise according to the cylinder control system in claim 6-12 described in any one, and the described locking cylinder (100) of this cylinder control system is arranged between described car body (200) and described jib (300) as amplitude oil cylinder.
14. trucks according to claim 13 or fire-fighting operation car, it is characterized in that, described jib (300) also comprises more piece joint arm hinged successively, and described locking cylinder (100) is also arranged between the adjacent described joint arm of two joints as amplitude oil cylinder.
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| CN201410612754.2A CN104454781B (en) | 2014-11-04 | 2014-11-04 | Locking amplitude-variable oil cylinder, oil cylinder control system, climbing fire truck or fire-fighting operation vehicle |
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| CN201410612754.2A CN104454781B (en) | 2014-11-04 | 2014-11-04 | Locking amplitude-variable oil cylinder, oil cylinder control system, climbing fire truck or fire-fighting operation vehicle |
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| CN105882807A (en) * | 2015-08-11 | 2016-08-24 | 乐视体育文化产业发展（北京）有限公司 | Saddle lifting device and bicycle |
| CN105257619A (en) * | 2015-11-13 | 2016-01-20 | 湖南特力液压有限公司 | Hydraulic cylinder |
| CN106979189A (en) * | 2017-05-22 | 2017-07-25 | 泸州长江油缸制造有限公司 | Operating cylinder linkage position-limit mechanism |
| CN106979189B (en) * | 2017-05-22 | 2018-05-08 | 泸州长江油缸制造有限公司 | Operating cylinder linkage position-limit mechanism |
| CN108167268A (en) * | 2017-12-20 | 2018-06-15 | 中国航发长春控制科技有限公司 | A kind of actuator locks modular structure |
| CN110500336A (en) * | 2018-05-18 | 2019-11-26 | 赛峰起落架***公司 | The telescopic actuator that band locks automatically |
| CN111946691A (en) * | 2020-07-16 | 2020-11-17 | 中国铁建重工集团股份有限公司 | Hydraulic cylinder, centering clamping hydraulic system, clamping device and drill jumbo |
| CN112661015A (en) * | 2020-12-09 | 2021-04-16 | 中联重科股份有限公司 | Plug-in type hydraulic valve, single-cylinder plug pin type suspension arm hydraulic control system and crane |
| 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 |
| CN113565830A (en) * | 2021-08-25 | 2021-10-29 | 马庆国 | Single-acting hydraulic cylinder |
| CN113565830B (en) * | 2021-08-25 | 2023-09-19 | 重庆众颖熙科技有限公司 | Single-acting hydraulic cylinder |
| CN114934931A (en) * | 2022-06-28 | 2022-08-23 | 湖北特种设备检验检测研究院 | Lifting oil cylinder capable of preventing large arm of automobile crane from falling down and control method |
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Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province Patentee after: Hunan Zoomlion emergency equipment Co.,Ltd. Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. Address before: 410200 No. 997, Jinxing Road, Wangcheng District, Changsha City, Hunan Province Patentee before: Changsha Zhonglian Fire-Fighting Machinery Co.,Ltd. Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |
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