CN101725164A - Hydraulic circuit for construction machinery - Google Patents
Hydraulic circuit for construction machinery Download PDFInfo
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- CN101725164A CN101725164A CN200910002286A CN200910002286A CN101725164A CN 101725164 A CN101725164 A CN 101725164A CN 200910002286 A CN200910002286 A CN 200910002286A CN 200910002286 A CN200910002286 A CN 200910002286A CN 101725164 A CN101725164 A CN 101725164A
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- Prior art keywords
- power tool
- overflow
- pressure
- hydraulic cylinder
- valve
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
- B66C13/066—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads for minimising vibration of a boom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
- B66C3/04—Tine grabs
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Shovels (AREA)
- Fluid-Pressure Circuits (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention provides a hydraulic circuit for construction machineries, in which an adaptor rotated by the hydraulic cylinder is mounted on the construction machinery on the front end arm through a connection rod mechanism, and a suspending type operation tool and a rotation type operation tool are replacable installed on the adaptor. Variable overflow valves are provided, which are connected with a cylinder bottom chamber (28c) of the hydraulic cylinder (28), and each pipelines (75, 76) between the control valves (66) of the piston rod chamber (28d) and the hydraulic cylinder (28). An electromagnetic valve (84) and a switch (86) is provided, wherein the electromagnetic valve can switch the configured pressure of each of the variable overflow valves (82, 83) disposed in parallel with each other and equipped with check valves (93, 94) between a high side overflow pressure and a low side overflow pressure. The switch (86) is shut during the installation of the rotation type operation tool so that the variable overflow valve (82, 83) is configured at the high side overflow pressure. And the switch (86) is opened during the installation of the suspending type operation tool so that the variable overflow valve (82, 83) is configured at the high side over-flow pressure.
Description
Technical field
The present invention relates to the hydraulic circuit of engineering machinery, this project machinery is installed hang down formula power tool and rotary type power tool on the adapter of the front end of arm replaceably being installed in operation, the described formula power tool that hangs down can use as lifting electromagnet, grab bucket, prong scraper bowl etc. with hanging down, and described rotary type power tool need make its rotation in operation process as backhoe type scraper bowl etc.
Background technology
In engineering machinery, in that (following will the needs in operation process as the backhoe type scraper bowl makes the power tool of its rotation be called the rotary type power tool with the backhoe type scraper bowl.) be installed in articulated structure the situation of operation with the front end of arm under, on the front end arm of operation, hydraulic cylinder is installed with arm, the piston rod of this hydraulic cylinder linkage via the angle of rotation increase usefulness of power tool is attached on the backhoe type scraper bowl.Aforementioned link mechanism is by being attached at connecting rod on the front end arm that operation uses by pivot (hereinafter referred to as the arm connecting rod.) and with this arm connecting rod one end is attached on the piston rod of above-mentioned hydraulic cylinder, the other end is attached at connecting rod on the power tool (hereinafter referred to as the power tool connecting rod.) constitute.
Go forward side by side under the situation of line operate installing on the elongated front end arm like that as material processed machinery to grab bucket, if so that the posture that grab bucket is tilted is operated, then because the front end arm is an elongate, burden to the front end arm becomes bigger, therefore, generally in the past all operate the hydraulic cylinder line operate of going forward side by side for the mode of vertical posture with grab bucket.But; if in the posture of considering this grab bucket; and the words that operation is carried out on limit operation hydraulic cylinder limit then operator's burden can increase; therefore, hope can be carried out operation under via the state of the binding of linkage (the following power tool that will carry out operation is called the formula power tool that hangs down with hanging down having removed hydraulic cylinder and power tool.)。
But, if remove the binding via linkage of hang down formula power tool and hydraulic cylinder like this, and the formula power tool that will hang down is installed on the front end arm with hanging down, then the power tool side end owing to the power tool connecting rod is not attached on the formula power tool that hangs down, so become vacant state, along with the action of operation with arm, the power tool connecting rod swing also collides the front end arm, makes the damage of front end arm.
The swing of the power tool connecting rod in order to prevent to use this to hang down the formula power tool, a kind of power tool connecting rod antiswing device has been proposed in patent documentation 1, on the front end arm, fixed part is set, the end of this power tool connecting rod is fixed on this fixed part by pin.In addition, this power tool connecting rod is fixed under the situation of the structure on the front end arm, because pressure oil is released to hydraulic cylinder from control valve in employing, the hydraulic cylinder elongation, therefore, apply the power of forcing via the power tool connecting rod to fixed part, this fixed part might deform and damage.Therefore, in the invention of patent documentation 1 record, for the fixed part that prevents this power tool connecting rod extends distortion, the damage that causes because of hydraulic cylinder, a kind of hydraulic circuit has also been proposed, this hydraulic circuit adds a kind of mechanism, at hang down formula power tool and the power tool connecting rod being fixed under the state on the front end arm of use, thereby this mechanism cuts off the elongation that pipeline between control valve and the hydraulic cylinder prevents hydraulic cylinder.
On the other hand, in engineering machinery, power tool is not directly installed on the front end arm, but as patent documentation 2 and patent documentation 3 records, the adapter that can easily carry out the mounting or dismounting of power tool is installed on the front end arm, and this adapter is attached on the above-mentioned hydraulic cylinder via linkage, on this adapter, can change the operation of various power tools.If use such adapter, then can be easily and promptly change because of the different power tool of operation type.
Patent documentation 1: No. 3767399 communique of Japan Patent
Patent documentation 2: Japanese kokai publication hei 9-209391 communique
Patent documentation 3: Japanese kokai publication hei 11-107307 communique
As patent documentation 1 record, in the engineering machinery that the such rotary type power tool of the such formula that hangs down power tool of clamshell style bagger scraper bowl and backhoe type scraper bowl can be installed with changing, as patent documentation 2,3 records, adapter always is installed on the front end arm, as long as on this adapter, can change various power tools are installed, just can easily and be promptly carried out the replacing of power tool.
But, shown in patent documentation 1, use when hanging down the formula power tool structure that the power tool connecting rod is fixed on the front end arm can not as patent documentation 2,3 this power tool connecting rod always is attached under the situation on the adapter adopt.Therefore, existence can not realize cutting down the problem that power tool is changed time, labour.
Summary of the invention
The present invention in view of the above problems, its purpose is to provide a kind of hydraulic circuit of engineering machinery, operation with arm on mounting adapter and making via linkage by hydraulic cylinder in the engineering machinery that adapter can link rotationally, on this adapter, can the formula power tool that hang down be installed with vertical posture, and, solve the problem of using the power tool connecting rod swing when hanging down the formula power tool, can cut down the needed time and labor of replacing of power tool.
The hydraulic circuit of the engineering machinery of technical scheme one, wherein, engineering machinery installs power tool with adapter can be installed in operation rotationally with on the front end arm of arm, the hydraulic cylinder that described adapter is rotated via linkage is installed on described front end arm, as described power tool, the variation at the angle of slope of described front end arm all is installed on the described adapter in the mode that can exchange from the hang down formula that the hangs down power tool of exercising usefulness of going forward side by side of described front end arm with vertical posture when rotary type power tool that rotates by the work of described hydraulic cylinder during operation and operation, it is characterized in that, the hydraulic circuit of described engineering machinery has: variable overflow valve, and it can be to the cylinder bottom chamber of described hydraulic cylinder, the highest hydraulic pressure of each pipeline between the control valve of piston rod chamber and described hydraulic cylinder is set; Be connected the flap valve on each variable overflow valve respectively side by side; Overflow crush-cutting converting mechanism, it can optionally switch the setting pressure of described variable overflow valve between high-pressure side overflow pressure and low-pressure side overflow pressure, it is that overflow by to described pipeline supply pressure oil described rotary type power tool can being rotated is pressed that described high-pressure side overflow is pressed, and it is that power tool deadweight when installing by the described formula power tool that hangs down can be pressed power tool from the overflow that inclination attitude is rotated to vertical posture that described low-pressure side overflow is pressed.
The hydraulic circuit of the engineering machinery of technical scheme two in the hydraulic circuit of the engineering machinery of technical scheme one, is characterized in that: also have: the electromagnetic valve that row switches is compressed in the overflow of described overflow valve; Be located in the driver's cabin of described engineering machinery the switch that described electromagnetic valve is switched.
The effect of invention
According to technical scheme one of the present invention, under the situation of using the rotary type power tool,, the overflow of variable overflow valve sets high-pressure side overflow pressure for by being pressed, thereby being rotated by hydraulic cylinder, the rotary type power tool carries out operation.On the other hand, under the situation of formula power tool is hung down in use, the overflow of variable overflow valve pressed set the low-pressure side overflow for and press.Under this situation, by the action of operation with arm, the front end arm changes with respect to the angle of slope of plumb line.Accompany therewith, the formula that hangs down power tool also changes with respect to the angle of slope of plumb line, by the deadweight of the formula power tool that hangs down, produces hydraulic pressure according to the angle of slope in the cylinder bottom chamber (or piston rod chamber) of hydraulic cylinder.And, by the hydraulic pressure that in this cylinder bottom chamber (piston rod chamber), produces, working oil is flowed through and is connected the pipeline on the cylinder bottom chamber (piston rod chamber), the variable overflow valve of this pipeline, the flap valve that is connected on the lateral line of piston rod chamber (cylinder bottom chamber) and refluxes to piston rod chamber (cylinder bottom chamber), the formula power tool of hanging down reverts to vertical posture, can always carry out operation with vertical posture.Therefore, the operator need not to make the vertical complicated operations of formula power tool that hangs down, and operation becomes easily, and the operation raising.
In addition, when changing power tool, be set at high-pressure side overflow pressure by the overflow of variable overflow valve is pressed, the rotation of the adapter that can be used to change has realized that cutting down power tool changes required time, labour.
In addition, under the situation of formula power tool is hung down in use, because the power tool connecting rod is limited under the state that is linked on the adapter, so, the change at the angle of slope of the front end arm when the power tool connecting rod can be along with operation and swinging can prevent the swing because of the power tool connecting rod, the damage of front end arm that collision causes.
In addition, hang down the formula power tool when operating in use, because power tool always is connected on the hydraulic cylinder via linkage, so the swing of the formula that the hangs down power tool that the rotation of upper rotating body begins, the inertia because of power tool when stopping to cause can be suppressed by the flow resistance of the working oil in the hydraulic cylinder, the operator need not to operate in order to prevent this swing, say in this sense, operation becomes easily, and can alleviate operator's burden, makes the operation raising.Especially, press highly slightly than fuel tank, just can improve this swing inhibition effect as long as the low-pressure side overflow when the formula power tool that will hang down uses presses to be set at.In addition, because the swing of power tool is suppressed, so it is easy that the location of power tool becomes.
In addition, even under the situation that the formula power tool operates is hung down in use, requirement according to special operation, make at needs under the situation of power tool inclination, as long as the overflow pressure of overflow valve is set at high-pressure side overflow pressure, just can make the power tool inclination and carry out operation, can improve applicability operation field.
According to technical scheme two of the present invention, owing to will be located in the driver's cabin of engineering machinery to switching the switch that electromagnetic valve that overflow presses switch, so, can be easily and promptly switch overflow and press.
Description of drawings
Fig. 1 is the lateral view of an example of the expression engineering machinery that is suitable for hydraulic circuit of the present invention.
Fig. 2 is the structure of power tool of presentation graphs 1 and the enlarged drawing of mounting structure.
Fig. 3 is the lateral view of an example of expression adapter used in the present invention.
Fig. 4 is the figure of expression based on the erection sequence of the power tool of this example adapter.
Fig. 5 is that expression will be installed in the lateral view of the state on the arm as the backhoe type scraper bowl of an example of the rotary type power tool that uses in engineering machinery of the present invention.
Fig. 6 is that expression will be installed in the lateral view of the state on the arm as the lifting electromagnet of an example of the formula that the hangs down power tool that uses in engineering machinery of the present invention.
Fig. 7 is the hydraulic circuit diagram of an embodiment of the hydraulic circuit of expression engineering machinery of the present invention.
Fig. 8 is the vertical view of the configuration of the switch used instead of the overflow crush-cutting of expression in the present embodiment.
Fig. 9 is the hydraulic circuit diagram of other embodiments of the hydraulic circuit of expression engineering machinery of the present invention.
Description of reference numerals
1: engineering machinery, 2: bunding, 3: ground, 4: boats and ships, 5: bottom driving body, 6: pylon, 7: whirligig, 8: upper rotating body, 10: hydraulic power unit, 11: driver's cabin, 12: counterweight, 13: platform, 14: ladder, 15: guardrail, 16: ladder, 17: platform, 18: guardrail, 20: the operation arm, 21: hydraulic cylinder, 22: the first arm, 23: hydraulic cylinder, 24: front end arm, 25: adapter, 26: grab bucket, 28: hydraulic cylinder, 28c: cylinder bottom chamber, 28d: piston rod chamber, 29: linkage, 30,32,33,35,37: pin, 31: carriage, 34: arm connecting rod, 36: power tool connecting rod, 40,41: pin, 42: carriage, 43: framework, 44: pivot, 45: control pawl, 46: hydraulic cylinder, 47,48: projection, 50: lower frame, 51: fixing hook portion, 52: movable hook portion, 53: axle, 54: moveable arm, 55: fitting portion, 56: hydraulic cylinder, 57,58: pin, 59: pin-and-hole, 60: lock pin, 61: backhoe type scraper bowl, 62: lifting electromagnet, 63: main pump, 64: pioneer pump, 65: fuel tank, 66: control valve, 67: pilot valve, 68: action bars, 82,83: overflow valve, 82a, 83a: operating room, 82b, 83b: hand operating mechanism, 84: electromagnetic valve, 85: power supply, 86: switch, 93,94: flap valve
The specific embodiment
Fig. 1 is the lateral view of an example of expression engineering machinery of the present invention.Reference numeral 1 is illustrated in the engineering machinery that near the bunding 2 ground 3 enterprising luggages unload operation, is the loading that the goods that carries on boats and ships 4 is carried out, the machinery of unloading.Reference numeral 5 expression self-propelled bottom driving bodies in this embodiment, show this bottom driving body 5 and are the situation of crawler type driving body, still, the situation that is suitable for wheeled driving body or has the driving body of the iron tyre that rolls are in orbit arranged also.
On the driving body framework of bottom driving body 5, pylon 6 is set, is provided with upper rotating body 8 via whirligig 7 at the top of pylon 6.On upper rotating body 8, carry hydraulic power unit 10, driver's cabin 11, counterweight 12 etc.In the part midway of pylon 6, and below upper rotating body 8, be provided with the platform 13 that the Maintenance and Repair such as hydraulic power unit 10 of lift-launch on upper rotating body 8 are used.This platform 13 is positioned at the height that can overhaul carrying equipment below upper rotating body 8, in addition, have the close front and back width of width with the front and back of upper rotating body 8.Reference numeral 14 expression is in order to allow operator or operator etc. be installed in ladder on this platform 13 to carrying out lifting this platform 13 from ground.Around platform 13, be provided with guardrail 15 for safety.Also be provided with the lifting ladder 16 that between this upper rotating body 8 and platform 13, is used to make liftings such as operator on the upper rotating body 8.On upper rotating body 8, also be provided with platform 17 and guardrail 18.
Front end at front end arm 24 is installed the formula power tool that hangs down via adapter 25.In this embodiment, show this situation of formula power tool that hang down for grab bucket 26.Reference numeral 28 expressions are installed in the hydraulic cylinder on the front end arm 24, are the devices that power tool is rotated via linkage 29 with adapter 25.
Fig. 2 represents to grab bucket the figure of structure of 26 mounting structure and this grab bucket 26 enlargedly.Adapter 25 can be installed in the front end of front end arm 24 rotationally by pin 30.One end of hydraulic cylinder 28 (pipe 28a) links and is installed on the carriage 31 on the upper surface of being located at front end arm 24 by pin 32 as shown in Figure 1.The connecting rod that constitutes linkage 29 has an end and is attached at arm connecting rod 34 on the front end arm 24 and an end by pin 33 pivots and is attached at power tool connecting rod 36 on the adapter 25 by pin 35 pivots, the other end (piston rod 28b) of hydraulic cylinder 28 is attached at the front end of these connecting rods 34,36 by pin 37.
Grab bucket 26 has the carriage 42 that is provided with on the adapter 25 for being installed at an upper portion thereof.This carriage 42 is made of two blocks of parallel-plates, and the ground, bottom of clamping adapter 25 can be attached on the adapter 25 by pin 40,41 with installing and removing.Be provided with framework 43 in the bottom of this carriage 42, on this framework 43, can install many via pivot 44 respectively with opening and closing and control pawl 45.At framework 43 with respectively control between the pawl 45 hydraulic cylinder 46 that mounting jaw respectively opens and closes usefulness.
Fig. 3 is the lateral view of the structure of expression adapter 25.As shown in Figure 3, be provided with on the top of adapter 25 by pin 30 and be attached at the installation portion (projection) 47 on the front end arm 24 and be attached at installation portion (projection) 48 on the power tool connecting rod 36 by pin 35.Be provided with the chimeric fixedly hook portion 51 that is used to link the pin 40 of above-mentioned grab bucket 26 in the end of the lower frame 50 of adapter 25.Reference numeral 52 is illustrated in and should be fixedly keeps selling 40 movable hook portion between the hook portion 51 in the mode that can not extract.This movable hook portion 52 is that the center can be installed rotationally with the axle 53 that is located on the lower frame 50.
Order when Fig. 4 represents to place grab bucket 26 on the ground to be installed on the adapter 25.At first, shown in Fig. 4 (A), shrink by making hydraulic cylinder 56, make moveable arm 54 near lower frame 50 sides, movable hook portion 52 becomes the open state that leaves from fixing hook portion 51.Then, descend by making the first arm shown in Figure 1 22, and adapter 25 is descended, shown in Fig. 4 (B), hook portion 51 is entrenched on the pin 40 that is installed in the side in the grab bucket 26 in advance thereby make fixedly.
Then, the first arm shown in Figure 1 22 is mentioned a little, shown in Fig. 4 (C), make hydraulic cylinder 28 elongations that are installed on the front end arm 24, thereby adapter 25 is rotated to driver's cabin 11 sides, and by mentioning the rear side of adapter 25, make fixedly hook portion 51 up, anti-shotpin 40 gets loose.Simultaneously, the fitting portion 55 that makes moveable arm 54 be installed in adapter 25 in advance on the pin 41 relative and contacts of opposite side.
Then, shown in Fig. 4 (D), make hydraulic cylinder 56 elongation, thereby moveable arm 54 is rotated fitting portion 55 is entrenched on the pin 41 that is installed in the grab bucket 26.Simultaneously, movable hook portion 52 is hooked on the pin 40 and in this movable hook portion 52 with fixedly control pin 40 between the hook portion 51.Then, thereby lock pin 60 is inserted into the activity that prevents movable hook portion 52 in the hole 59 that sets in advance on lower frame 50, with movable hook portion 52 lockings.
To grab bucket 26 when adapter 25 is pulled down, to grab bucket and 26 place ground, lock pin 60 is extracted from lower frame 50, make hydraulic cylinder 56 contractions and movable hook portion 52 is separated from pin 40, simultaneously, fitting portion 55 is pulled down from pin 41, hydraulic cylinder 28 is shunk thereby moveable arm 54 is rotated, and slightly the first arm 22 is mentioned, 26 pull down from adapter 25 thereby will grab bucket.
Fig. 5 represents that the example with the rotary type power tool is backhoe type scraper bowl 61 and is installed in state on the front end arm 24 via adapter 25.Fig. 6 is that expression will hang down that to be lifting electromagnet 62 be installed in example on the front end arm 24 via adapter 25 for other examples of formula power tool.In addition, grab bucket 26 and the lifting electromagnet 62 as the formula power tool that hangs down also can be used to rotary type.In addition, for example, prong scraper bowl etc. also can be used in rotary type, any form in the formula that hangs down.
Fig. 7 is the hydraulic circuit diagram of an embodiment of expression hydraulic circuit of the present invention.The main pump that the above-mentioned hydraulic power unit 10 of Reference numeral 63 expressions is comprised, Reference numeral 64,65 is represented pioneer pump and the fuel tank that above-mentioned hydraulic power unit 10 is comprised respectively.Reference numeral 66 expression is located at the control valve on the hydraulic circuit between main pump 63 and the hydraulic cylinder 28.The pilot valve of Reference numeral 67 expression control valves 66.
This pilot valve 67 carries out following action: with action bars 68 when arrow 69 directions are operated, be fed into the operating room 66a of control valve 66 from the pilot pressure oil of pioneer pump 64 by pipeline 70, valve 71, pipeline 72, thereby control valve 66 is switched to the position.Thus, from the pressure oil of main pump 63 by port 66c, the 66d of control valve 66, the cylinder bottom chamber 28c that pipeline 75 enters hydraulic cylinder 28, the working oil of piston rod chamber 28d is got back to fuel tank 65 by port 66e, 66f, the pipeline 77 of pipeline 76, control valve 66, thus hydraulic cylinder 28 elongations.
On the contrary, with action bars 68 during, be fed into the operating room 66b of control valve 66 from the pilot pressure oil of pioneer pump 64 by pipeline 70, valve 79, pipeline 80, thereby control valve 66 is switched to upper/lower positions to the operation of the direction of arrow 78.Thus, from the pressure oil of main pump 63 by port 66c, the 66e of control valve 66, the piston rod chamber 28d that pipeline 76 enters hydraulic cylinder 28, the working oil of cylinder bottom chamber 28c is got back to fuel tank 65 by port 66d, 66f, the pipeline 77 of pipeline 75, control valve 66, thereby hydraulic cylinder 28 shrinks.
The electromagnetic valve that Reference numeral 84 expressions are provided with for the overflow of switching variable overflow valve 82,83 is pressed.The power supply on upper rotating body 8 is carried in Reference numeral 85 expressions, and Reference numeral 86 expressions are installed in the switch (with reference to Fig. 8) of the electromagnetic valve switching usefulness on the driver's cabin 11.Under the situation of using backhoe type scraper bowl 61 power tools such as rotary type such as grade, close switch 86 (separation).At this moment, owing to no power in the solenoid 84a of electromagnetic valve 84, so electromagnetic valve 84 is positioned at illustrated upper/lower positions.Therefore, be fed into operating room 82a, the 83a of variable overflow valve 82,83 from the pilot pressure oil of pioneer pump 64 by pipeline 87, electromagnetic valve 84, pipeline 88, pipeline 89,90, the overflow of variable overflow valve 82,83 is pressed and is set to high pressure.Therefore, thus be switched to control valve 66 on position or upper/lower positions when carrying out elongation, the contractive action of hydraulic cylinder 28 because the hydraulic pressure of pipeline 75,76 is set to more than the high-pressure side overflow presses, so can carry out the rotation of rotary type power tool.
On the contrary, under situation about using under the state that the formula power tool that hangs down is hung down from front end arm 24, open switch 86 (closure).Thus, switch in the solenoid 84a of electromagnetic valve 84 by power supply 85, electromagnetic valve 84 is switched to the position.Therefore, the looped pipeline road 88 of electromagnetic valve 84 is communicated with pipeline 91 on being connected fuel tank 65 via electromagnetic valve 84.Therefore, the hydraulic pressure of operating room 82a, 83a becomes fuel tank presses, and the overflow of variable overflow valve 82,83 presses to low pressure.
Be set under the situation of low pressure like this overflow of variable overflow valve 82,83 being pressed, as shown in Figure 2, under 26 states of installing via adapter 25 of will grabbing bucket, when the center of gravity G of grab bucket 26 is positioned at the place ahead (opposition side of upper rotating body 8) of pin 30, by grabbing bucket 26 deadweight F, be that the center produces the rotatory force to arrow 92 directions with pin 30.
Under this situation, in the 28d of the piston rod chamber of hydraulic cylinder 28, produce the hydraulic pressure that causes by this deadweight.By this deadweight, be essentially with respect to the angle of inclination that plumb line became at the line that links center of gravity G and pin 30 and can hold into vertical angle when above, preestablish that overflow is pressed so that it becomes that the low-pressure side overflow presses is more than the 3.9MPa, at this moment, no matter whether control valve 66 is positioned at illustrated neutral position, and grab bucket 26 all can be rotated by deadweight.That is, the working oil in the 28d of piston rod chamber enters cylinder bottom chamber 28c by pipeline 76, variable overflow valve 83, flap valve 93, pipeline 75.At this moment, poor according to the sectional area between piston rod chamber 28d and the cylinder bottom chamber 28c, working oil is replenished to cylinder bottom chamber 28c by pipeline 77, flap valve 93, pipeline 75 from fuel tank 65.
Be positioned at center of gravity G under the situation at rear of pin 30, produce the hydraulic pressure that causes by the power tool deadweight at cylinder bottom chamber 28c.And for more than the low-pressure side overflow pressure, then no matter whether control valve 66 is positioned at the neutral position as if this hydraulic pressure, and the working oil in the 28c of cylinder bottom chamber all can enter piston rod chamber 28d by pipeline 75, variable overflow valve 82, flap valve 94, pipeline 76.At this moment, poor according to the sectional area between piston rod chamber 28d and the cylinder bottom chamber 28c flowed out to fuel tank 75 by pipeline 77 from the part of the working oil of cylinder bottom chamber 28c.
Like this, in the 28c of cylinder bottom chamber, produce under the situation of the hydraulic pressure that causes because of the power tool deadweight, promptly, at power tool backward under the oblique situation of inclination, the difference of the sectional area by piston rod chamber 28d and cylinder bottom chamber 28c is compared with the situation that inclination forward is oblique, the hydraulic pressure that produces because of deadweight in the 28c of cylinder bottom chamber reduces, if it is identical that the low-pressure side overflow of variable overflow valve 82,83 is pressed, the minimal tilt angle that then can rotate by deadweight becomes big slightly under the oblique situation of inclination backward at power tool.Owing to can make this minimal tilt angle that can rotate more little when low-pressure side overflow pressure is low more, therefore, set this low-pressure side overflow pressure according to the weight of power tool and the kind of power tool etc. and get final product.Can hold the minimal tilt angle of this vertical posture, be preferably below 10 degree from the viewpoint of operating efficiency.In addition, for the above-mentioned minimal tilt angle that makes grab bucket the place ahead of 26, rear equates, also can be with the sectional area in the hydraulic cylinder 28 the low-pressure side overflow of the variable overflow valve 82 of bigger cylinder bottom chamber 82c side press the piston rod chamber 28d that sets more lessly low than sectional area.
Like this, according to present embodiment, variable overflow valve 82 is set, 83, this variable overflow valve 82,83 can be to being connected the pipeline 75 on the hydraulic cylinder 28,76 hydraulic pressure is set, use as the situation of 26 the formula that the hangs down power tool of grabbing bucket under, because with variable overflow valve 82,83 overflow is pressed and is set at low-pressure side overflow pressure, therefore, angle regardless of front end arm 24,26 grades of the grabbing bucket formula power tool that hangs down all can rely on deadweight to be rotated to become vertical posture, can under the state that hangs down, carry out operation, the operator need not to make the formula power tool of hanging down become the complicated operations of vertical position to hydraulic cylinder 28, operation becomes easily, and, the operation raising.In addition, when changing power tool,, the overflow of variable overflow valve 82,83 is set at high-pressure side overflow pressure, the rotation of the adapter 25 that can be used to change by being pressed.
Therefore, under the situation of any that the rotary type power tools or the formula power tool that hangs down are installed via adapter 25 on the front end arm 24, can carry out operation, can also carry out the replacing of power tool with the rotary state of original power tool or the state of hanging down.And, under the situation of formula power tool is hung down in installation, because power tool connecting rod 36 is limited under the state that is attached on the adapter 25, so, power tool connecting rod 36 can not prevent the swing owing to power tool connecting rod 36, the damage of colliding the front end arm 24 that causes along with operation is swung with the action of arm 20.
In addition, under the situation of using the formula power tools that hang down such as grab bucket 26 and lifting electromagnet 62, because these power tools always are connected on the hydraulic cylinder 28 via linkage 29, so, between swing that upper rotating body 8 rotation beginning, the inertia because of power tool 26,62 when stopping cause can be by the cylinder bottom chamber 28c of hydraulic cylinder 28, piston rod chamber 28d and the flow resistance of the working oil between these chambers 28c, 28d and the fuel tank 65 suppress.Therefore, the operator does not need to prevent the operation of swinging, and says the burden that can alleviate the operator in this sense, improves operation.In addition, because the swing of power tool is suppressed, so it is easy that the location of power tool also becomes.In addition, the low-pressure side overflow is pressed and also be can be used as fuel tank and press, but shown in the enforcement mode, presses high slightly overflow to press if the low-pressure side overflow when the formula power tool that will hang down uses presses to set for than fuel tank, then should swing suppresses effect and can further improve.
In addition, when using grab bucket 26 grades to hang down the formula power tool, for example, exist below certain structure under the situation of wanting the object of controlling, as long as the overflow of variable overflow valve 82,83 pressed be set at the high-pressure side overflow and press, just can make grab bucket 26 become horizontal and control object.Therefore, can enlarge the operation form that uses when hanging down the formula power tool.
In addition, in the above-described embodiment, shown in the vertical view of Fig. 8, because the driver's cabin 11 that switch 86 that row switches is located at engineering machinery is compressed in the overflow of the switching circuit of variable overflow valve 82,83, so, can be easily and promptly carry out the switching that overflow is pressed.
In the above-described embodiment, switch, switch, but as shown in Figure 9, can also adopt operational means 82b, 83b to switch the structure that overflow is pressed by hand and row is compressed in the overflow of variable overflow valve 82,83 by 86 pairs of electromagnetic valves 84 of switch.
The present invention can also be used for following Other Engineering machinery except that above-mentioned embodiment, be about to be installed in operation with the engineering machinery on the arm as the power tool that the formula power tool that hangs down uses.
Claims (2)
1. the hydraulic circuit of an engineering machinery, wherein,
Described engineering machinery installs power tool with adapter can be installed in operation rotationally with on the front end arm of arm,
The hydraulic cylinder that described adapter is rotated via linkage is installed on described front end arm,
As described power tool, the variation at the angle of slope of described front end arm all is installed on the described adapter in the mode that can change from the hang down formula that the hangs down power tool of exercising usefulness of going forward side by side of described front end arm with vertical posture when rotary type power tool that rotates by the work of described hydraulic cylinder during operation and operation, it is characterized in that
The hydraulic circuit of described engineering machinery has:
Variable overflow valve is set the highest hydraulic pressure of each pipeline between the control valve of cylinder bottom chamber, piston rod chamber and the described hydraulic cylinder of described hydraulic cylinder;
Be connected the flap valve on each variable overflow valve respectively side by side;
Overflow crush-cutting converting mechanism, it can optionally switch the setting pressure of described variable overflow valve between high-pressure side overflow pressure and low-pressure side overflow pressure, it is that overflow by to described pipeline supply pressure oil described rotary type power tool can being rotated is pressed that described high-pressure side overflow is pressed, and it is that power tool deadweight when installing by the described formula power tool that hangs down can be pressed power tool from the overflow that inclination attitude is rotated to vertical posture that described low-pressure side overflow is pressed.
2. the hydraulic circuit of engineering machinery as claimed in claim 1 is characterized in that, also has:
The electromagnetic valve that row switches is compressed in the overflow of described overflow valve;
The switch that is located in the driver's cabin of described engineering machinery and described electromagnetic valve is switched.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008270862A JP5203131B2 (en) | 2008-10-21 | 2008-10-21 | Hydraulic circuit for construction machinery |
| JP2008-270862 | 2008-10-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101725164A true CN101725164A (en) | 2010-06-09 |
| CN101725164B CN101725164B (en) | 2012-07-18 |
Family
ID=42138818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100022866A Expired - Fee Related CN101725164B (en) | 2008-10-21 | 2009-09-09 | Hydraulic circuit for construction machinery |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5203131B2 (en) |
| KR (1) | KR101148148B1 (en) |
| CN (1) | CN101725164B (en) |
| AU (1) | AU2009222574B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649560A (en) * | 2011-07-26 | 2014-03-19 | 沃尔沃建造设备有限公司 | Hydraulic system for construction machinery |
| CN104520595A (en) * | 2012-08-16 | 2015-04-15 | 沃尔沃建造设备有限公司 | Hydraulic control valve for construction machinery |
| CN105297822A (en) * | 2015-11-06 | 2016-02-03 | 徐州徐工挖掘机械有限公司 | Multifunctional machine and tool hydraulic assistance system of excavator |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5631762B2 (en) * | 2011-01-25 | 2014-11-26 | 日立建機株式会社 | Work equipment front specification discriminator |
| CN102502409B (en) * | 2011-11-08 | 2014-05-14 | 中国矿业大学 | Horizontal pinned hydraulic system of crawler crane counterweight |
| JP5892440B2 (en) * | 2011-12-22 | 2016-03-23 | サントリーホールディングス株式会社 | Blank sheet feeder |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS622805U (en) * | 1985-06-20 | 1987-01-09 | ||
| JPH0723622B2 (en) * | 1987-04-09 | 1995-03-15 | 株式会社神戸製鋼所 | Control device for turning parking brake |
| JPH07119708A (en) * | 1993-10-26 | 1995-05-09 | Komatsu Ltd | Oil pressure circuit for rotation |
| JPH0960046A (en) * | 1995-08-28 | 1997-03-04 | Kobelco Kenki Eng Kk | Long-range working machine device for construction machine |
| US5727342A (en) * | 1996-04-18 | 1998-03-17 | Wain-Roy, Inc. | Hydraulic latch pin assembly for coupling a tool to a construction equipment |
| JP3718111B2 (en) * | 2000-07-06 | 2005-11-16 | 日立建機株式会社 | Work machine |
| JP2010242774A (en) | 2009-04-01 | 2010-10-28 | Caterpillar Sarl | Cylinder control device and working machine |
-
2008
- 2008-10-21 JP JP2008270862A patent/JP5203131B2/en not_active Expired - Fee Related
-
2009
- 2009-09-09 CN CN2009100022866A patent/CN101725164B/en not_active Expired - Fee Related
- 2009-09-29 AU AU2009222574A patent/AU2009222574B2/en not_active Ceased
- 2009-10-20 KR KR1020090099545A patent/KR101148148B1/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649560A (en) * | 2011-07-26 | 2014-03-19 | 沃尔沃建造设备有限公司 | Hydraulic system for construction machinery |
| CN103649560B (en) * | 2011-07-26 | 2016-04-06 | 沃尔沃建造设备有限公司 | For the hydraulic system of construction plant |
| CN104520595A (en) * | 2012-08-16 | 2015-04-15 | 沃尔沃建造设备有限公司 | Hydraulic control valve for construction machinery |
| CN104520595B (en) * | 2012-08-16 | 2016-02-10 | 沃尔沃建造设备有限公司 | For the hydraulic control valve of construction plant |
| CN105297822A (en) * | 2015-11-06 | 2016-02-03 | 徐州徐工挖掘机械有限公司 | Multifunctional machine and tool hydraulic assistance system of excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20100044117A (en) | 2010-04-29 |
| AU2009222574B2 (en) | 2011-09-08 |
| AU2009222574A1 (en) | 2010-05-06 |
| KR101148148B1 (en) | 2012-05-23 |
| JP2010101004A (en) | 2010-05-06 |
| JP5203131B2 (en) | 2013-06-05 |
| CN101725164B (en) | 2012-07-18 |
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