CN1753831A - Hydraulic control device of hydraulic working machine - Google Patents
Hydraulic control device of hydraulic working machine Download PDFInfo
- Publication number
- CN1753831A CN1753831A CNA2004800053234A CN200480005323A CN1753831A CN 1753831 A CN1753831 A CN 1753831A CN A2004800053234 A CNA2004800053234 A CN A2004800053234A CN 200480005323 A CN200480005323 A CN 200480005323A CN 1753831 A CN1753831 A CN 1753831A
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- hydraulic
- pipeline
- actuating cylinder
- crane arm
- working machine
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
- E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
- E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
- E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
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- 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
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- 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
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
- B66F9/0655—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Jib Cranes (AREA)
Abstract
It comprising a derricking cylinder (7) rotating the free end of a boom in a derricking direction, an attachment rotatably fixed to the tip part of the boom, a tilt cylinder (8) vertically rotating the attachment relative to the boom, and a leveling cylinder (9) extending/retracting in conjunction with the derricking operation of the boom to hold the vertical angle of the attachment at a preset angle according to a variation in the derricking angle of the boom, wherein when the working pressure of the derricking cylinder (7) is increased to a pressure higher than a preset pressure in boom raising operation, a pipeline (35) for performing the extending operation of the derricking cylinder (7) is allowed to communicate with a pipeline (33) for performing the extending operation of the leveling cylinder (9). This communication is performed by a pipeline (37) installed between the pipelines (35) and (33) and first and second selector valves (21) and (20) switching the circuit of the pipeline (37).
Description
Technical field
The present invention relates to have crane arm and irrelevant, the angle for the above-below direction of car body can be remained on the hydraulic control device of hydraulic working machines such as crane-car of the accessory device of predefined angle with the landing angle of this crane arm.
Background technology
We know at present as hydraulic working machine, use crane-car etc. to be used for the vehicle or the aloft work vehicle of loading and unloading operation.As the aloft work vehicle, for example in registration utility model No. 2566631 communique patent documentation 1 disclosed device to be that the crowd contracts known.
In hydraulic working machines such as the aloft work vehicle of this class or crane-car, load-carrying ability, the performance that promptly can promote multiple goods are much accounted of.In order to improve the load-carrying ability of hydraulic working machine, the general method of using the bigger hydraulic actuating cylinder of compression area as the landing hydraulic actuating cylinder that adopts.
But, because the power that hydraulic actuating cylinder produces is by compression area * pressure representative, therefore, if use the big hydraulic actuating cylinder of compression area, though can improve the hoisting capacity of hydraulic working machine, but, therefore when the big hydraulic actuating cylinder of use compression area, then produce inappropriate situations such as boom pivot lifting speed is slack-off because the rate of stretch of hydraulic actuating cylinder represented by the inflow flow/compression area of fluid.In addition, because the big more price of compression area of hydraulic actuating cylinder is also high more, therefore when the big hydraulic actuating cylinder of use compression area, then also can produce inappropriate situations such as hydraulic working machine cost rising.
In addition, in described prior art, though select the leveling corrective action by select switch, or use other method to carry out the leveling correction, do not consider speed or load-carrying ability when crane arm promotes action especially.
The present invention is the invention of carrying out in view of the practical problems of such prior art, and therefore, the responsiveness that its purpose is to provide a kind of crane arm to promote can be slower than existing, and the hydraulic control device of the high hydraulic working machine of load-carrying ability.
Summary of the invention
In order to achieve the above object, the 1st method is: a kind of hydraulic control device of hydraulic working machine, it comprises: an end is held the crane arm that is installed in rotation on fixation side as rotating, the other end that makes described crane arm is as 1st hydraulic actuating cylinder of free end in the rotation of landing direction, be installed in rotation on the accessory device of the free end one side leading section of described crane arm, the 2nd hydraulic actuating cylinder that described accessory device is rotated at above-below direction relative to described crane arm, stretch in linkage with the landing action of described crane arm, and the angle of the above-below direction of described accessory device is remained on the 3rd hydraulic actuating cylinder of predefined angle according to the variation of the landing angle of described crane arm, supply with the Hydraulic Pump of fluid respectively to the described the 1st and the 2nd hydraulic actuating cylinder, to the mobile directional control valve of controlling of the fluid supplied with to the described the 1st and the 2nd hydraulic actuating cylinder by this Hydraulic Pump with this directional control valve is carried out the handling device of blocked operation, being characterized as of the hydraulic control device of this hydraulic working machine: when the operation pressure with described the 1st hydraulic actuating cylinder when crane arm promotes operation becomes bigger than predefined pressure, make a side of the stretching that carries out described the 1st hydraulic actuating cylinder and carry out the unit that a side of the stretching of described the 3rd hydraulic actuating cylinder is connected.
Being characterized as of the 2nd method: in the 1st method, the described unit that is communicated with is set at the 3rd pipeline that connects the 1st pipeline and the 2nd pipeline, the 1st pipeline is connected a side of the stretching that carries out described the 1st hydraulic actuating cylinder, and the 2nd pipeline is connected a side of the stretching that carries out described the 3rd hydraulic actuating cylinder.
Being characterized as of the 3rd method: in the 2nd method, the described unit that is communicated with switches by the 1st change-over valve that is arranged on described the 3rd pipeline with according to carrying out the operation that crane arm promotes the described handling device of operation, and the pressure of described the 1st pipeline is constituted to the 2nd change-over valve of targeting port (pilot port) guiding of described the 1st change-over valve.
Being characterized as of the 4th method: in the 3rd method, described handling device is the handling device of hydraulic controlling type, and described the 2nd change-over valve carries out the switching of described the 1st change-over valve to the described control mouthful described fluid control presssure of guiding.
Being characterized as of the 5th method: in the 1st method, described crane arm has the telescoping mechanism more than or equal to 2 sections.
Being characterized as of the 6th method: in the 1st method, described accessory device has in shovel fork, hanging basket and the scraper bowl.
Being characterized as of the 7th method: in the 1st method, described fixation side is the base portion of described hydraulic working machine.
Being characterized as of the 8th method: in any one method of the 1st to the 7th, described hydraulic working machine comprises any one in lifting vehicle and the aloft work vehicle.
In addition, in the following embodiments, the 1st hydraulic actuating cylinder is corresponding to landing hydraulic actuating cylinder 7, the 2nd hydraulic actuating cylinder is corresponding to tilt cylinder 8, the 3rd hydraulic actuating cylinder is corresponding to leveling hydraulic actuating cylinder 9, the unit that is communicated with is corresponding to the 1st and the 2nd change-over valve 21,20, Hydraulic Pump is corresponding to symbol 10, and directional control valve is corresponding to symbol 11, and handling device is corresponding to symbol 13, the 1st change-over valve is corresponding to the 1st change-over valve 21, the 2nd change-over valve corresponding to the 2nd change-over valve 20, the 1 pipelines corresponding to pipeline 35, the 2 pipelines corresponding to pipeline 33, the 3rd pipeline corresponding to the control mouth of pipeline 37, the 1 change-over valves corresponding to symbol 21d.
According to the present invention, when the operation pressure of the 1st hydraulic actuating cylinder when crane arm promotes operation becomes bigger than predefined pressure, supply with the fluid of discharging to stretching one side of the 1st hydraulic actuating cylinder and stretching one side of the 3rd hydraulic actuating cylinder by Hydraulic Pump, therefore, the tensile force of the 3rd hydraulic actuating cylinder propulsive effort as swivelling jib can be used, can improve the load-carrying ability of hydraulic working machine.
Description of drawings
Fig. 1 relates to the pining drawing of the hydraulic tubing that the hydraulic working machine of embodiment of the present invention possesses.
Fig. 2 is the lateral plan of an example that expression relates to the hydraulic working machine of embodiment of the present invention.
The specific embodiment
Below, with reference to the accompanying drawings preferred forms of the present invention is described.
Fig. 2 is the figure of expression as an example of the lifting vehicle of the hydraulic working machine that relates to embodiment of the present invention.By this figure as can be seen, the lifting vehicle that relates to present embodiment comprises: have front-wheel 2, the car body 1 of trailing wheel 3 and control cabin 4, one end is installed in rotation on the telescopic crane arm 5 of car body 1, be installed in rotation on the accessory devices 6 such as shovel fork of the leading section of crane arm 5, be arranged between car body 1 and the crane arm 5, the landing hydraulic actuating cylinder 7 that crane arm 5 is rotated in landing direction (A-B direction) with respect to car body 1, be arranged between crane arm 5 and the accessory device 6, make accessory device 6 with respect to crane arm 5 tilt cylinder 8 that direction of tilt (C-D direction) rotates and be arranged on car body 1 and crane arm 5 between, the leveling hydraulic actuating cylinder 9 that stretches in linkage with the landing action of crane arm 5.
When variation has taken place in the landing angle with respect to the crane arm 5 of car body 1 in leveling hydraulic actuating cylinder 9, also will remain on predefined angle with respect to the relative angle (angle of inclination) of the above-below direction of the accessory device 6 of car body 1, be connected with tilt cylinder 8 via the pipeline of not representing among the figure, when crane arm 5 is carried out the landing operation, supply with by the next fluid of leveling hydraulic actuating cylinder 9 extrusion to tilt cylinder 8, change accessory device 6 is with respect to the angle of inclination of crane arm 5.In addition, in this embodiment, for example understand shovel fork, but in addition go back the usage mining sandy soil or put in order the scraper bowl on ground or hanging basket that goods and people are up transported or the like as accessory device 6 shipping goods.
Fig. 1 represents the pining drawing of the hydraulic tubing that the lifting vehicle of described structure possesses.In addition, in the pining drawing of Fig. 1, owing to do not have direct relation, therefore omitted the hydraulic tubing that is used to make crane arm 5 flexible with explanation of the present invention, but crane arm 5 can with a plurality of sections flexible, for example can be flexible with 5 sections.
As seen from Figure 1, the hydraulic tubing that relates to present embodiment is by constituting with the lower part: as the Hydraulic Pump 10 of hydraulic efficiency power unit, the mobile directional control valve of controlling 11 to the fluid supplied with to landing hydraulic actuating cylinder 7 by Hydraulic Pump 10, the mobile directional control valve of controlling 12 to the fluid supplied with to tilt cylinder 8 by Hydraulic Pump 10, the handling device 13 of directional control valve 11, the handling device 14 of directional control valve 12, the pipeline 35 and 36 of closure control cock 11 and landing hydraulic actuating cylinder 7, be arranged on the balancing device valve 15 of pipeline 35 (stretching one lateral line of landing hydraulic actuating cylinder 7), the pipeline 31 and 32 of closure control cock 12 and tilt cylinder 8, be arranged on the balancing device valve 16 of pipeline 31 (stretching one lateral line of tilt cylinder 8), the pipeline of the 9a of bottom compartment of connecting line 31 and leveling hydraulic actuating cylinder 9 (stretching one lateral line of leveling hydraulic actuating cylinder 9) 33, the pipeline 34 of the piston rod chamber 9b of connecting line 32 and leveling hydraulic actuating cylinder 9, with the safety valve 17 that is provided with on the pipeline of export pipeline 30 that is connected Hydraulic Pump 10 and fuel tank 18, handling device 13 and 14 is respectively by lever 13a and 14a, reducing valve 13b and 14b, the control pump 40 of supplying with control presssure constitutes.
In the present embodiment, be provided with the pipeline 37 that stretching one lateral line 33 with stretching one lateral line 35 of landing hydraulic actuating cylinder 7 and leveling hydraulic actuating cylinder 9 is connected, be provided with the 1st change-over valve 21 and the 2nd change-over valve 20 at this pipeline 37, the 2nd change-over valve 20 switches according to the crane arm lifting operation of handling device 13, supplies with the pressure of stretching one lateral line 35 of landing hydraulic actuating cylinder 7 to the control mouth 21d of the 1st change-over valve 21.In addition, the setting pressure of the 1st change-over valve of setting by the return spring 21c that possesses in the 1st change-over valve 21 21 or switch setting pressure and be set to the value also lower a little than the setting pressure of safety valve 17.In addition, connected unit the constituting in the claim scope by described the 1st change-over valve 21 and described the 2nd change-over valve 20.
As operator's operating operation handle 14a, for supply with to control mouthful 12d control presssure with direction change-over valve 12 when middle position 12b switches to position 12a, supply with the fluid of discharging to the piston rod chamber of tilt cylinder 8 8b by pipeline 30, direction change-over valve 12 and pipeline 32 by Hydraulic Pump 10, therefore tilt cylinder 8 is to the shrinkage direction action, and accessory device 6 down (D direction) rotates.Along with the contractive action of tilt cylinder 8, get back to fuel tank 18 by balancing device valve 16, pipeline 31 and direction change-over valve 12 from the work fluid that the 8a of bottom compartment of tilt cylinder 8 extrudes.
Relatively therewith, as operator's operating operation handle 14a, when direction change-over valve 12 being switched to position 12c for supplying with control presssure to control mouthful 12e, supply with the fluid of discharging to the 8a of the bottom compartment of tilt cylinder 8 by pipeline 30, direction change-over valve 12, pipeline 31 and the boiler check valve 16a that is arranged on balancing device valve 16 by Hydraulic Pump 10, therefore tilt cylinder 8 is to the direction of extension action, and accessory device 6 up (C direction) rotates.Along with the stretching of tilt cylinder 8, the work fluid that extrudes from the piston rod chamber 8b of tilt cylinder 8 turns back to fuel tank 18 by pipeline 32 and direction change-over valve 12.
In addition, as operator's operating operation handle 13a, for supply with to control mouthful 11d control presssure with direction change-over valve 11 when middle position 11b switches to position 11a, supply with the fluid of discharging to the 7a of the bottom compartment of landing hydraulic actuating cylinder 7 by pipeline 30, direction change-over valve 11, pipeline 35 and the boiler check valve 15a that is arranged on balancing device valve 15 by Hydraulic Pump 10, therefore landing hydraulic actuating cylinder 7 is to the direction of extension action, and crane arm 5 upwards (A direction) rotates.Along with the stretching of landing hydraulic actuating cylinder 7, the work fluid that extrudes from the piston rod chamber 7b of landing hydraulic actuating cylinder 7 turns back to fuel tank 18 by pipeline 36 and direction change-over valve 11.When crane arm 5 upwards rotates, leveling hydraulic actuating cylinder 9 is stretched forcibly, work fluid is forced out from the piston rod chamber 9b of leveling hydraulic actuating cylinder 9, therefore this work fluid flows into the piston rod chamber 8b of tilt cylinder 8 by pipeline 34 and pipeline 32, tilt cylinder 8 is to the shrinkage direction action, and accessory device 6 downward (D direction) rotates.Along with the contractive action of tilt cylinder 8, the work fluid that extrudes from the 8a of bottom compartment of tilt cylinder 8 is imported into the 9a of bottom compartment of leveling hydraulic actuating cylinder 9 by balancing device valve 16, pipeline 31 and pipeline 33.As a result,, change, automatically remain on crane arm and promote state before the operation with respect to the relative angle of the above-below direction of the accessory device 6 of car body 1 according to the lifting of crane arm 5 operation.
Promote at crane arm under the situation of the control mouth 20d that does not act on the 2nd change-over valve 20 with control presssure, the 2nd change-over valve 20 remains on position 20a.At this moment, have only tank pressure to act on the control mouth 21d of the 1st change-over valve 21, therefore the 1st change-over valve 21 remains on position 21a, when disconnecting pipeline 31 and pipeline 37, by the 1st change-over valve 21 connecting pipelines 31 and pipeline 33.
Relatively therewith, as operator's operating operation handle 13a, when direction change-over valve 11 being switched to chamber 11c for supplying with control presssure to control mouthful 11e, supply with the fluid of discharging to the piston rod chamber of landing hydraulic actuating cylinder 7 7b by pipeline 30, direction change-over valve 11 and pipeline 36 by Hydraulic Pump 10, therefore landing hydraulic actuating cylinder 7 is to the shrinkage direction action, and crane arm 5 down (B direction) rotates.Along with the contractive action of landing hydraulic actuating cylinder 7, the work fluid that extrudes from the 7a of bottom compartment of landing hydraulic actuating cylinder 7 turns back to fuel tank 18 by balancing device valve 15, pipeline 35 and direction change-over valve 11.When crane arm 5 rotates, leveling hydraulic actuating cylinder 9 is shunk forcibly, work fluid is forced out from the 9a of bottom compartment of leveling hydraulic actuating cylinder 9, therefore this work fluid flows into the 8a of bottom compartment of tilt cylinder 8 by the boiler check valve 16a of pipeline 33, pipeline 31 and balancing device valve 16, tilt cylinder 8 is to the direction of extension action, and accessory device 6 upwards (C direction) rotates.Along with the stretching of tilt cylinder 8, the work fluid that extrudes from the piston rod chamber 8b of tilt cylinder 8 is imported into the piston rod chamber 9b of leveling hydraulic actuating cylinder 9 by pipeline 32 and pipeline 34.As a result, irrelevant with the downward operation of crane arm 5, automatically remain on crane arm with respect to the angle of inclination of the accessory device 6 of car body 1 and promote state before the operation.
When being carried out crane arm lifting operation by the operator, by the control presssure from handling device 13, direction change-over valve 11 is switched to position 11a, and the 2nd change-over valve 20 is switched to position 20b simultaneously.Thus, boiler check valve 15a by pipeline 30, direction change-over valve 11, pipeline 35 and balancing device valve 15 supplies with the fluid of being discharged by Hydraulic Pump 10 to the 7a of the bottom compartment of landing hydraulic actuating cylinder 7, the 2nd change-over valve 20 is switched to position 20b simultaneously, so the pressure of pipeline 35 (operation pressure of landing hydraulic actuating cylinder 7) also acts on the control mouth 21d of the 1st change-over valve 21 by pipeline 37.Want the weight of the goods that promotes to restart the operation pressure that falls hydraulic actuating cylinder 7 more by accessory device 6 big more.
When the setting pressure of operating pressure ratio the 1st change-over valve 21 of landing hydraulic actuating cylinder 7 hour,, therefore keep the off-state of pipeline 31 and pipeline 37 and the connected state of pipeline 31 and pipeline 33 because the 1st change-over valve 21 remains on position 21a.Therefore, the adjustment operation at angle of inclination of accessory device 6 of also carrying out the lifting operation of crane arm 5 this moment and following the lifting operation of crane arm 5 according to above-mentioned order.
When the setting pressure of operating pressure ratio the 1st change-over valve 21 of landing hydraulic actuating cylinder 7 is big, because the 1st change-over valve 21 is switched to position 21b, therefore by pipeline 37 connecting lines 33 and pipeline 35, connecting line 31 and fuel tank 18 simultaneously.Therefore, supply with the fluid of discharging by pipeline 30, direction change-over valve 11 and pipeline 35 to the 7a of the bottom compartment of landing hydraulic actuating cylinder 7, simultaneously by pipeline 37, change-over valve 21 and a part of fluid of pipeline 33 in the 9a of the bottom compartment of leveling hydraulic actuating cylinder 9 feed pipe 35 by Hydraulic Pump 10.Thus, produce the power of direction of extension landing hydraulic actuating cylinder 7 and leveling hydraulic actuating cylinder 9 both sides, these masterpieces are that the power that crane arm 5 is upwards rotated plays a role, and therefore compare with the situation of only using the landing hydraulic actuating cylinder that crane arm 5 is upwards rotated, can improve the load-carrying ability of hydraulic working machine.
In addition, in the present embodiment, though for example to handling device the 13, the 14th, the situation of the handling device of hydraulic control mode is illustrated, and also can make the operated handling device of electricity consumption.At this moment, by the operation output electric signal of lever 13a, the electric signal of exporting according to operating operation handle 13a switches the 2nd change-over valve 20.
In addition, in the structure of Fig. 1, can to the control mouth 11d bonded assembly pilot piping that crane arm promotes a side switching pressure detector be set with directional control valve 11, by this pressure detector detected pressures conversion, the control mouth 20d that for example converts this detection signal (electric signal) to pressure by electric hydraulic pressure change-over valve and import the 2nd change-over valve 20 switches the 2nd change-over valve.
And, in the present embodiment, though constitute the converting unit that pipeline 37 is communicated with by the 1st and the 2nd change-over valve 21,20, but can to the control mouth 11d bonded assembly pilot piping that crane arm promotes a side switching pressure detector be set at pipeline 37 with directional control valve 11, go out the big and directional control valve 11 of the predefined pressure of pressure ratio of pipeline 37 at control setup according to signal detection and switch to crane arm when promoting a side, switch the 1st change-over valve 21 according to control signal from this control setup from separately pressure detector.In addition, this switching for example will convert pressure to from the control signal of described control setup by electric hydraulic pressure change-over valve, exert pressure by the control mouth 21d at the 1st change-over valve 21 and carry out.
Like this, the hydraulic working machine that relates to present embodiment possesses according to predefined force value change and pipeline 35 at the pipeline 37 of the pipeline 33 of pipeline 35 that connects landing hydraulic actuating cylinder 7 stretchings one side and leveling hydraulic actuating cylinder 9 stretchings one side, the unit of 33 connected state (change-over valve 20,21), when the setting pressure of the operating pressure ratio pipeline switch unit of the landing hydraulic actuating cylinder 7 when crane arm promotes operation is big, be communicated with each stretching one lateral line 33,35, both sides to stretching one side of stretching one side of landing hydraulic actuating cylinder 7 and leveling hydraulic actuating cylinder 9 supply with the fluid of being discharged by Hydraulic Pump 10, therefore the tensile force of leveling hydraulic actuating cylinder 9 propulsive effort that also can be used as swivelling jib uses, and can improve the load-carrying ability of hydraulic working machine thus.
In addition, the miniaturization of the compression area of landing hydraulic actuating cylinder 7 can be under the situation of the load-carrying ability of not sacrificing hydraulic working machine, sought, the cost degradation of hydraulic working machine can be sought thus.
And being used for of the hydraulic working machine that this is routine supplied with unit from the fluid of being discharged by Hydraulic Pump 10 to leveling hydraulic actuating cylinder 9 is made of two change-over valves 20,21, therefore can constitute by the combination of universal product.
In addition, in the present embodiment, the described unit that is communicated with is made of the 1st change-over valve 21 and the 2nd change-over valve 20, but when the operation pressure of the 1st hydraulic actuating cylinder when crane arm promotes operation becomes bigger than predefined pressure, if possess the function that side of carrying out the 1st hydraulic actuating cylinder stretching and a side of carrying out the 3rd hydraulic actuating cylinder stretching are communicated with, then be not limited to the combination of described change-over valve 21,20, as required the design that can suit.
Claims (8)
1. the hydraulic control device of a hydraulic working machine, it comprises:
One end is installed in rotation on the crane arm of fixation side;
An other end that makes described crane arm is as 1st hydraulic actuating cylinder of free end in the rotation of landing direction;
Be installed in rotation on the accessory device of described crane arm leading section;
The 2nd hydraulic actuating cylinder that described accessory device is rotated at above-below direction with respect to described crane arm;
Stretch in linkage with the landing of described crane arm action,, the angle of the above-below direction of described accessory device is remained on the 3rd hydraulic actuating cylinder of predefined angle according to the variation of the landing angle of described crane arm;
Supply with the Hydraulic Pump of fluid respectively to the described the 1st and the 2nd hydraulic actuating cylinder;
The mobile directional control valve of controlling to the fluid supplied with to the described the 1st and the 2nd hydraulic actuating cylinder by this Hydraulic Pump; With
This directional control valve is carried out the handling device of blocked operation,
It is characterized in that,
When the operation pressure that possesses described the 1st hydraulic actuating cylinder when crane arm promotes operation becomes bigger than predefined pressure, the unit that the side of carrying out described the 1st hydraulic actuating cylinder stretching and the side of carrying out described the 3rd hydraulic actuating cylinder stretching are communicated with.
2. the hydraulic control device of hydraulic working machine according to claim 1 is characterized in that,
The described unit that is communicated with is arranged on the 3rd pipeline, and the 3rd pipeline connects the 1st pipeline and the 2nd pipeline, and the 1st pipeline is connected a side of carrying out described the 1st hydraulic actuating cylinder stretching, and the 2nd pipeline is connected a side of carrying out described the 3rd hydraulic actuating cylinder stretching.
3. the hydraulic control device of hydraulic working machine according to claim 2 is characterized in that,
The described unit that is communicated with possesses:
Be arranged on the 1st change-over valve of described the 3rd pipeline; With
Operation according to the described handling device that carries out crane arm lifting operation is switched, and the pressure of described the 1st pipeline is imported the 2nd change-over valve of the control mouth of described the 1st change-over valve.
4. the hydraulic control device of hydraulic working machine according to claim 3 is characterized in that,
Described handling device is the hydraulic controlling type handling device, and described the 2nd change-over valve carries out the switching of described the 1st change-over valve to the described control mouthful described hydraulic control pressure of importing.
5. the hydraulic control device of hydraulic working machine according to claim 1 is characterized in that,
Described crane arm has the telescoping mechanism more than or equal to 2 sections.
6. the hydraulic control device of hydraulic working machine according to claim 1 is characterized in that,
Described accessory device comprises in shovel fork, hanging basket and the scraper bowl.
7. the hydraulic control device of hydraulic working machine according to claim 1 is characterized in that,
Described fixation side is arranged on the main part of described hydraulic working machine.
8. according to the hydraulic control device of any described hydraulic working machine of claim 1 to 7, it is characterized in that,
Described hydraulic working machine comprises any one in lifting vehicle and the aloft work vehicle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003051569 | 2003-02-27 | ||
| JP51569/2003 | 2003-02-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1753831A true CN1753831A (en) | 2006-03-29 |
Family
ID=32923369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004800053234A Pending CN1753831A (en) | 2003-02-27 | 2004-02-27 | Hydraulic control device of hydraulic working machine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1600419A4 (en) |
| JP (1) | JPWO2004076334A1 (en) |
| KR (1) | KR20050101351A (en) |
| CN (1) | CN1753831A (en) |
| WO (1) | WO2004076334A1 (en) |
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| CN101892681A (en) * | 2009-05-22 | 2010-11-24 | 沃尔沃建造设备控股（瑞典）有限公司 | Hydraulic system with improved complex operation |
| CN102030293A (en) * | 2010-12-10 | 2011-04-27 | 徐州重型机械有限公司 | Elevated operation vehicle and platform leveling hydraulic system thereof |
| CN102616707A (en) * | 2011-01-30 | 2012-08-01 | 长沙中联消防机械有限公司 | Work bucket leveling control device |
| CN103046590A (en) * | 2013-01-30 | 2013-04-17 | 江苏柳工机械有限公司 | Control method of hydraulic working system of loading machine |
| CN103629175A (en) * | 2013-11-28 | 2014-03-12 | 长沙中联消防机械有限公司 | Working hopper hydraulic control system and engineering vehicle |
| CN104728200A (en) * | 2013-12-24 | 2015-06-24 | 卡特彼勒（青州）有限公司 | Hydraulic system and loader with same |
| CN106460363A (en) * | 2016-05-31 | 2017-02-22 | 株式会社小松制作所 | Work Machinery Control System, Work Machinery, And Work Machinery Control Method |
| CN106574646A (en) * | 2014-10-02 | 2017-04-19 | 日立建机株式会社 | Hydraulic drive system of industrial machine |
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- 2004-02-27 EP EP04715501A patent/EP1600419A4/en not_active Withdrawn
- 2004-02-27 KR KR1020057015504A patent/KR20050101351A/en active IP Right Grant
- 2004-02-27 JP JP2005502952A patent/JPWO2004076334A1/en not_active Withdrawn
- 2004-02-27 CN CNA2004800053234A patent/CN1753831A/en active Pending
- 2004-02-27 WO PCT/JP2004/002380 patent/WO2004076334A1/en not_active Application Discontinuation
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| CN112064698A (en) * | 2020-08-21 | 2020-12-11 | 中联重科股份有限公司 | Bucket automatic leveling control method and system based on angle |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004076334A1 (en) | 2004-09-10 |
| EP1600419A1 (en) | 2005-11-30 |
| KR20050101351A (en) | 2005-10-21 |
| EP1600419A4 (en) | 2006-12-27 |
| JPWO2004076334A1 (en) | 2006-06-01 |
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