CN103290869B - The control system of a kind of bulldozer and shovel blade inclination thereof - Google Patents
The control system of a kind of bulldozer and shovel blade inclination thereof Download PDFInfo
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- CN103290869B CN103290869B CN201310254664.6A CN201310254664A CN103290869B CN 103290869 B CN103290869 B CN 103290869B CN 201310254664 A CN201310254664 A CN 201310254664A CN 103290869 B CN103290869 B CN 103290869B
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Abstract
The invention provides the control system of a kind of bulldozer and shovel blade inclination thereof, perching knife can be avoided to carry out inclination operation when lift cylinder is in extreme position and produce excessive torque.Described control system comprises the lift cylinder of fuel tank and two parallel connections, described control system is also provided with hydraulic operated valve, the oil-in of described hydraulic operated valve is communicated with described fuel tank with the back cavity hydraulic fluid port of described lift cylinder respectively with oil-out, when the back cavity oil pressure of described lift cylinder reaches predetermined value, described hydraulic operated valve is in and is communicated with position, when the back cavity oil pressure of described lift cylinder is lower than described predetermined value, described hydraulic operated valve is in and disconnects position.When the back cavity oil pressure of lift cylinder reaches predetermined value, the back cavity hydraulic fluid port of lift cylinder is communicated with fuel tank by hydraulic operated valve, lift cylinder stop motion now and the stroke that can not reach capacity, therefore when perching knife carries out inclination operation, two lift cylinders can free-extension, then the hinged place of lift cylinder can not produce excessive torque, also would not produce the problems such as front hood distortion.
Description
Technical field
The present invention relates to bulldozer technical field, particularly relate to the control system that a kind of bulldozer perching knife tilts.The invention still further relates to a kind of bulldozer with above-mentioned control system.
Background technology
In prior art, the hydraulic control system of bulldozer mainly comprises two lift cylinders and a dump ram, and lift cylinder is mainly used in the lifting realizing perching knife, and dump ram is for completing tilting of perching knife.
One end of lift cylinder is hinged on perching knife, and the other end is hinged on the front hood of bulldozer, and when carrying out the lift work of perching knife, the oil-feed respectively of the oily chamber, front and back from lift cylinder of hydraulic control, to complete the rise and fall of perching knife respectively; One end of dump ram is hinged on perching knife, and the other end is hinged on push rod, realizes tilting of perching knife by the promotion of push rod.
When perching knife carries out inclination operation, two lift cylinders need one to extend a shortening, complete tilt operation to coordinate dump ram.But, when perching knife lifting or when dropping to extreme position, because lift cylinder has reached capacity stroke, cannot stretch, if now carry out tilt operation, the hinged place of lift cylinder will be caused to produce larger moment of torsion, and then cause front hood to deform, even occur the problems such as fatigue fracture.
Therefore, how to design the control system that a kind of bulldozer perching knife tilts, carrying out inclination operation when lift cylinder is in extreme position to avoid perching knife and produce excessive torque, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide the control system that a kind of bulldozer perching knife tilts, perching knife can be avoided to carry out inclination operation when lift cylinder is in extreme position and produce excessive torque, and its automaticity is high, operates more safe and reliable.
For solving the problems of the technologies described above, the invention provides the control system that a kind of bulldozer perching knife tilts, described control system comprises the lift cylinder of fuel tank and two parallel connections, described control system is also provided with hydraulic operated valve, the oil-in of described hydraulic operated valve is communicated with described fuel tank with the back cavity hydraulic fluid port of described lift cylinder respectively with oil-out, when the back cavity oil pressure of described lift cylinder reaches predetermined value, described hydraulic operated valve is in and is communicated with position, when the back cavity oil pressure of described lift cylinder is lower than described predetermined value, described hydraulic operated valve is in and disconnects position.
Control system of the present invention is provided with hydraulic operated valve, when the back cavity oil pressure of lift cylinder reaches predetermined value, the back cavity hydraulic fluid port of lift cylinder is communicated with fuel tank by described hydraulic operated valve, then the hydraulic oil of back cavity hydraulic fluid port flows directly into fuel tank, can not continue to enter in lift cylinder, lift cylinder stop motion now, that is, by setting predetermined value, lift cylinder can be stuck in certain movement position, make it not reach limit travel; Because the piston rod of lift cylinder cannot reach limit travel, when perching knife carries out inclination operation, lift cylinder has certain displacement space, two lift cylinders can free-extension, therefore the hinged place of lift cylinder can not produce excessive torque, front hood also would not be caused to be out of shape, to produce the problems such as fatigue fracture.
Preferably, described control system also comprises the first hydraulic control one-way valve, the front end of described lift cylinder has default hydraulic fluid port, the oil pressure of described default hydraulic fluid port is corresponding with described predetermined value, the oil-in of described first hydraulic control one-way valve is communicated with the ante-chamber hydraulic fluid port of described default hydraulic fluid port and described lift cylinder respectively with control port, and the oil-out of described first hydraulic control one-way valve is communicated with the position control port that is communicated with of described hydraulic operated valve.
When lift cylinder drives perching knife to decline, the back cavity hydraulic oil of lift cylinder promotes piston advances forward, when back cavity hydraulic oil moves to described default hydraulic fluid port, the back cavity oil pressure of lift cylinder reaches described predetermined value, then back cavity hydraulic oil flows to the connection position control port of hydraulic operated valve by the first hydraulic control one-way valve, and then hydraulic operated valve is opened, back cavity hydraulic fluid port is communicated with fuel tank; Now, subsequent delivery flows directly in fuel tank to the hydraulic oil of lift cylinder back cavity, and the back cavity of lift cylinder can not continue oil-feed, also would not produce motive force to piston, and the motion of lift cylinder stops.
Preferably, control system also comprises the first one way valve, and the oil-in of described first one way valve is communicated with described default hydraulic fluid port, and the oil-out of described first one way valve is communicated with the oil-in of described first hydraulic control one-way valve and the ante-chamber hydraulic fluid port of described lift cylinder respectively.
When arranging the first one way valve, the back cavity hydraulic oil flowing to default hydraulic fluid port can flow to the ante-chamber of lift cylinder by the first one way valve, thus provides a reverse push power to piston, to play cushioning effect, makes the rapid stop motion of lift cylinder.
Preferably, described control system also comprises dump ram, and the oil-in of described dump ram is communicated with the disconnection position control port of described hydraulic operated valve.
When dump ram drives perching knife to carry out inclination operation, inclination hydraulic oil is entered by the oil-in of dump ram, inclination hydraulic oil flow to the disconnection position control port of hydraulic operated valve, promote hydraulic operated valve and be returned to disconnection position, normal condition replied by lift cylinder now, completes tilting action with ancillary oblique oil cylinder.
Preferably, the disconnection position control port of described hydraulic operated valve be communicated with position control port and be communicated with described fuel tank with the second hydraulic control one-way valve respectively by damping hole, the tilt oil of described second hydraulic control one-way valve by described dump ram and the ante-chamber oil pressure cntrol of described lift cylinder.
Being arranged between hydraulic operated valve and fuel tank of damping hole creates certain pressure differential, and the fluid be convenient in the disconnection position hydraulic cavities of described back cavity hydraulic oil promotion hydraulic operated valve successfully enters in described fuel tank; Second hydraulic control one-way valve is arranged between the connection position control port of hydraulic operated valve and fuel tank, prevents the fluid in the connection position hydraulic cavities of hydraulic operated valve from entering in fuel tank, ensures that hydraulic operated valve can normally be opened when needs; Only when dump ram carries out inclination operation, or when lift cylinder carries out lifting operation, just the second hydraulic control one-way valve can be opened, hydraulic operated valve is returned to and disconnect position.
Preferably, described control system also comprises the first shuttle valve, two oil-ins of described first shuttle valve are communicated with the ante-chamber hydraulic fluid port of described lift cylinder with the oil-in of described dump ram respectively, and the oil-out of described first shuttle valve is communicated with the control port of described second hydraulic control one-way valve.
By the setting of the first shuttle valve, the ante-chamber hydraulic oil of inclination hydraulic oil and lift cylinder is transported to the control port of the second hydraulic control one-way valve, to control oil sources as it.
Preferably, the piston of lift cylinder described in one of them has through hole, described trimmer valve comprises valve seat and spool, described valve seat coordinates with described through hole and has valve pocket, the length of described spool is less than described valve pocket, the two ends of described spool have the valve rod passing the protruding setting of described valve seat, and the total length of described valve rod and described spool is greater than the thickness of described piston, and described spool can coordinate with the two ends of described valve pocket respectively with the junction of described valve rod.
Cannot continue when lift cylinder is retracted into extreme position to retract, but the piston of lift cylinder is provided with trimmer valve, when piston is close to back cylinder cover, first the valve rod of trimmer valve contacts and is resisted against on back cylinder cover, thus whole spool is located, and piston continues to retreat to contacting rear stop motion with back cylinder cover, then the junction of spool and valve rod and the end of valve pocket are separated, and then the through hole of piston is opened, so that the ante-chamber of lift cylinder is connected with back cavity; Because two lift cylinders are parallel oil cylinder, the ante-chamber fluid in the lift cylinder stretched out then is needed to flow back to its back cavity by the trimmer valve of the lift cylinder of retracting, then need the oil cylinder stretched out to stretch out, also would not produce excessive torque because piston rod cannot normally stretch out in the hinged place of lift cylinder.
Preferably, between the back cavity hydraulic fluid port of described lift cylinder and described fuel tank, there is the second one way valve.
Due to the difference in volume in chamber before and after telescopic oil cylinder, cause the back cavity of the telescopic oil cylinder stretched out almost to form vacuum state, then the second one-way valve opens, the fluid in fuel tank flows into oil cylinder back cavity, plays the effect of repairing.
Preferably, described control system also comprises electromagnetism float trap, and the ante-chamber hydraulic fluid port of described lift cylinder is communicated with two hydraulic fluid ports of electromagnetism float trap respectively with back cavity hydraulic fluid port, to realize floating of lift cylinder.
The present invention also provides a kind of bulldozer, comprises the control system of carrying out shovel blade inclination, and described control system is the control system described in above-mentioned any one.
Because bulldozer of the present invention has the control system described in above-mentioned any one, therefore the technique effect that the control system described in above-mentioned any one produces all is applicable to bulldozer of the present invention, repeats no more herein.
Accompanying drawing explanation
Fig. 1 is the principle schematic of control system provided by the present invention in a kind of detailed description of the invention;
Fig. 2 is the structural representation of a kind of set-up mode of trimmer valve provided by the present invention;
Fig. 3 is lift cylinder of the present invention when being retracted into the laggard line tilt action of extreme position, the flow schematic diagram of the inner fluid of lift cylinder.
In Fig. 1-3:
1 lift cylinder, 10 electromagnetism float traps, 11 first hydraulic control one-way valves, 12 first one way valves, 13 pistons, 14 second one way valves, 15 back cylinder covers, 16 preset hydraulic fluid port, 2 damping holes, 3 trimmer valves, 31 valve seats, 32 spools, 33 valve pockets, 34 valve rods, 4 dump rams, 5 first shuttle valves, 6 hydraulic operated valves, 7 second shuttle valves, 8 second hydraulic control one-way valves, 9 fuel tanks, A1 front cavity oil inlet, B1 back cavity oil inlet, A2 ante-chamber hydraulic fluid port, B2 back cavity hydraulic fluid port
Detailed description of the invention
Core of the present invention is to provide the control system that a kind of bulldozer perching knife tilts, and can avoid carrying out inclination operation when lift cylinder moves to extreme position, and then avoids lift cylinder hinged place to produce excessive torque.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is the principle schematic of control system provided by the present invention in a kind of detailed description of the invention.
In a kind of detailed description of the invention, the control system that bulldozer perching knife of the present invention tilts comprises fuel tank 9, hydraulic operated valve 6 and two lift cylinders be arranged in parallel 1, and the oil-in of hydraulic operated valve 6 is communicated with fuel tank 9 with the back cavity hydraulic fluid port B2 of lift cylinder 1 respectively with oil-out; When lift cylinder 1 drives perching knife to decline, the back cavity hydraulic fluid port B2 oil-feed of lift cylinder 1, moves to promote piston 13, piston rod is extrapolated, and then drive the perching knife be connected with piston rod to decline, now the back cavity oil pressure of lift cylinder 1 is less, lower than predetermined value, hydraulic operated valve 6 is in and disconnects position; Along with the back cavity oil pressure of lift cylinder 1 increases gradually, piston 13 is pushed to certain altitude, when the back cavity oil pressure of lift cylinder 1 reaches predetermined value, hydraulic operated valve 6 is switched to and is communicated with position, to be communicated with fuel tank 9 by the back cavity hydraulic fluid port B2 of lift cylinder 1, now, fluid is delivered directly in fuel tank 9 by the back cavity hydraulic fluid port B2 of lift cylinder 1, the back cavity of lift cylinder 1 no longer continues oil-feed, then piston 13 rests on original position, lift cylinder 1 stop motion.
Because lift cylinder 1 does not reach capacity stroke and stop motion, therefore piston 13 has one section of reserved stroke; When carrying out shovel blade inclination operation, because the two ends of perching knife are connected with two lift cylinders 1 respectively, lift cylinder 1 needs to stretch passively, tilting action is completed with auxiliary perching knife, now, under the effect of inclination hydraulic oil, the piston 13 in the passive lift cylinder 1 stretched out continues to move along its reserved stroke; Because piston 13 has reserved stroke, it can be converted into mechanical movement when being subject to the effect of inclination hydraulic oil, also would not produce comparatively high pulling torque because stretching at lift cylinder 1 and the hinged place of front hood, and then avoid front hood to deform, cause the problems such as the fatigue fracture of front hood.
It should be noted that, the back cavity oil pressure of lift cylinder 1 reaches predetermined value and refers to that its back cavity oil pressure is more than or equal to described predetermined value; The reserved stroke relative set of described predetermined value and piston 13, namely when the back cavity oil pressure of lift cylinder 1 is equal to or greater than described predetermined value, the reserved stroke of piston 13 should be able to meet the demand of shovel blade inclination operation; Such as, described reserved stroke can for when perching knife completes inclination operation, and piston 13 moves to the distance of its limit travel by former stop place; Or described reserved stroke can be slightly less than above-mentioned distance, make the hinged place of lift cylinder 1 bear certain moment of torsion, but this moment of torsion can not be excessive, be unlikely to the distortion causing front hood.
In addition, stretching out of described lift cylinder 1 refers to that its piston 13 moves towards the direction of ante-chamber, and then it is protruding to promote piston rod, piston rod is connected with perching knife, when piston rod is protruding, perching knife moves downward under the promotion of piston rod, i.e. the descending motion of stretching out corresponding perching knife of lift cylinder 1; Accordingly, the retraction of described lift cylinder 1 refers to that piston 13 drives piston rod to retract in the cylinder body of lift cylinder 1, the now lifter motion of corresponding perching knife.
Wherein, hydraulic operated valve 6 is for utilizing the reversal valve of its spool position of pressure change of oil circuit control.
In one more specifically embodiment, by the connection position control oil sources of the back cavity hydraulic oil of lift cylinder 1 as hydraulic operated valve 6, and then hydraulic operated valve 6 can be opened.
Particularly, described control system can also comprise the first hydraulic control one-way valve 11, the front end of lift cylinder 1 can arrange default hydraulic fluid port 16, the oil pressure of this default hydraulic fluid port 16 is corresponding with described predetermined value, namely, when back cavity fluid moves to described default hydraulic fluid port 16, the back cavity oil pressure of lift cylinder 1 equals described preset value, the oil-in of the first hydraulic control one-way valve 11 is connected with described default hydraulic fluid port 16, its oil-out is communicated with the position control port that is communicated with of hydraulic operated valve 6, then when the back cavity hydraulic oil of lift cylinder 1 moves to described default hydraulic fluid port 16, the back cavity oil pressure of lift cylinder 1 reaches described predetermined value, back cavity hydraulic oil is now successively through described default hydraulic fluid port 16, first hydraulic control one-way valve 11 flows to the connection position control port of hydraulic operated valve 6, be in the oil pressure that hydraulic operated valve 6 is communicated with side, position and be greater than the pressure disconnecting side, position, thus hydraulic operated valve 6 is opened, the back cavity hydraulic fluid port B2 of lift cylinder 1 is communicated with fuel tank 9.
Meanwhile, the control port of the first hydraulic control one-way valve 11 is communicated with the ante-chamber hydraulic fluid port A2 of lift cylinder 1, then, when the ante-chamber oil-feed of lift cylinder 1, the first hydraulic control one-way valve 11 is closed by ante-chamber hydraulic oil; By above-mentioned setting, even if the ante-chamber hydraulic oil of lift cylinder 1 moves to described default hydraulic fluid port 16, ante-chamber hydraulic oil due to lift cylinder 1 cannot flow to the connection position control port of hydraulic operated valve 6, therefore hydraulic operated valve 6 is in disconnection position, so that lift cylinder 1 normally can be retracted into range, perching knife is risen to extreme position, the lifting operation of lift cylinder 1 pair of perching knife can not be affected.
On this basis, described control system can also comprise the first one way valve 12, the oil-in of the first one way valve 12 is communicated with described default hydraulic fluid port 16, and the oil-out of the first one way valve 12 is communicated with the ante-chamber hydraulic fluid port A2 of lift cylinder 1 with the oil-in of the first hydraulic control one-way valve 11 respectively; On the one hand, when back cavity hydraulic oil moves to described default hydraulic fluid port 16, what most of back cavity hydraulic oil flowed to hydraulic operated valve 6 through the first one way valve 12 and the first hydraulic control one-way valve 11 successively is communicated with position control port; On the other hand, some back cavity hydraulic oil flows into the ante-chamber of lift cylinder 1 by the first one way valve 12, then piston 13 is subject to the active force of ante-chamber hydraulic oil simultaneously, to offset part back cavity hydraulic oil to the motive force of piston 13, thus the motion cushioning effect played piston 13, make lift cylinder 1 promptly stop motion, to leave enough reserved strokes for inclination operation.
In addition, described control system also comprises dump ram 4, to complete the inclination operation of perching knife, the oil-in of dump ram 4 is communicated with the disconnection position control port of hydraulic operated valve 6, as shown in Figure 1.
When carrying out inclination operation, inclination hydraulic oil is entered by the oil-in of dump ram 4, then the disconnection position control port of hydraulic operated valve 6 is flowed into, then be in hydraulic operated valve 6 and disconnect the oil pressure of side, position higher than the oil pressure being communicated with side, position, and then promotion hydraulic operated valve 6 is returned to disconnection position, normal condition replied by lift cylinder 1, normally to stretch under the effect of tilt oil, and then ancillary oblique oil cylinder 4 completes inclination operation.
One more preferred embodiment in, the disconnection position control port of hydraulic operated valve 6 be communicated with position control port and can be communicated with described fuel tank 9 with the second hydraulic control one-way valve 8 respectively by damping hole 2; The tilt oil of the second hydraulic control one-way valve 8 by dump ram 4 and the ante-chamber oil pressure cntrol of lift cylinder 1.
Damping hole 2 to be arranged on mineralization pressure between the disconnection position of hydraulic operated valve 6 and fuel tank 9 poor so that hydraulic operated valve 6 be in be communicated with position time, its fluid disconnecting side, position can successfully flow in fuel tank 9; Oil circuit between the connection position of the second hydraulic control one-way valve 8 pairs of hydraulic operated valves 6 and fuel tank 9 controls, and prevents being in hydraulic operated valve 6 and is communicated with in the fluid inflow fuel tank 9 of side, position; When carrying out inclination operation, the inclination hydraulic oil of dump ram 4 acts on the control port of the second hydraulic control one-way valve 8, thus by the second hydraulic control one-way valve 8 reverse-conducting, inclination hydraulic oil acts on the disconnection position control port of hydraulic operated valve 6, thus is transported in fuel tank 9 by the fluid being in hydraulic operated valve 6 and being communicated with a side; When carrying out lifting operation, the ante-chamber hydraulic fluid port A2 oil-feed of lift cylinder 1, the ante-chamber hydraulic oil of lift cylinder 1 is by the second hydraulic control one-way valve 8 reverse-conducting, being in the fluid that hydraulic operated valve 6 is communicated with side, position flows in fuel tank 9 by the second hydraulic control one-way valve 8, hydraulic operated valve 6 is replied and is disconnected position, and perching knife normally can be risen to maximum travel position by lift cylinder 1.
Wherein, control system of the present invention can also comprise the first shuttle valve 5, two oil-ins of the first shuttle valve 5 are communicated with the ante-chamber hydraulic fluid port A2 of lift cylinder 1 with the oil-in of dump ram 4 respectively, the oil-out of the first shuttle valve 5 is communicated with the control port of the second hydraulic control one-way valve 8, then the second hydraulic control one-way valve 8 is controlled by the tilt oil of dump ram 4 and the ante-chamber oil pressure of lift cylinder 1, realizes its reverse-conducting.
It may occur to persons skilled in the art that, the oil-in of dump ram 4 comprises front cavity oil inlet A1 and back cavity oil inlet B1, for ease of realizing the control of oil-in to associated components of dump ram 4, can also arrange the second shuttle valve 7, as shown in Figure 1; Two oil-ins of the second shuttle valve 7 are communicated with back cavity oil inlet B1 with the front cavity oil inlet A1 of dump ram 4 respectively, and its oil-out is communicated with the disconnection position control port of hydraulic operated valve 6 with the oil-in of the first shuttle valve 5 respectively.
It will also be appreciated that, the side, disconnection position of hydraulic operated valve 6 can also arrange spring reset structure 61, and under normal circumstances, hydraulic operated valve 6 is pushed to off-state by spring reset structure 61; Only have the connection position control port oil-feed when hydraulic operated valve 6, when overcoming the spring force of spring reset structure 61, hydraulic operated valve 6 can conducting; When the hydraulic oil being communicated with position control port flows away, spring promotes hydraulic operated valve 6 and is returned to disconnection position; Or when the oil pressure of the disconnection position control port of hydraulic operated valve 6 and the spring force sum of spring reset structure 61 be greater than its be communicated with the oil pressure of position control port time, spring reset structure 61 with disconnect position hydraulic oil and jointly promote hydraulic operated valve 6 and reply off-state.
Moreover, between the ante-chamber of lift cylinder 1 and back cavity, electromagnetism float trap 10 can be set, the ante-chamber hydraulic fluid port A2 of lift cylinder 1 be communicated with two hydraulic fluid ports of electromagnetism float trap 10 respectively with back cavity hydraulic fluid port B2, to increase the floatability of lift cylinder 1, as shown in Figure 1.
Please further refer to the structural representation that Fig. 2 and Fig. 3, Fig. 2 are a kind of set-up mode of trimmer valve provided by the present invention; Fig. 3 is lift cylinder of the present invention when being retracted into the laggard line tilt action of extreme position, the flow schematic diagram of the inner fluid of lift cylinder.
When lift cylinder 1 is retracted into extreme position, be reduce the moment of torsion of lift cylinder 1 hinged place, a lift cylinder 1 can arrange trimmer valve 3 wherein.
As shown in Figure 2, the piston 13 of one of them lift cylinder 1 has through hole 131, and trimmer valve 3 comprises valve seat 31 and spool 32, and valve seat 31 is equipped with the through hole 131 on piston 13, and is formed with valve pocket 33 in valve seat 31; Spool 32 is built in valve pocket 33, and the length of spool 32 is less than valve pocket 33, and the two ends of spool 32 have the valve rod 34 passing the protruding setting of valve seat 31; The total length of valve rod 34 and spool 32 is greater than the thickness of piston 13, and spool 32 can coordinate with the two ends of described valve pocket 33 respectively with two junctions of valve rod 34.
Length due to spool 32 is less than valve pocket 33, therefore spool 32 can move back and forth in valve pocket 33, when spool 32 moves to the end of valve pocket 33 with the junction of valve rod 34, can coordinate with the end of valve pocket 33; When the end separating of described junction and valve pocket 33, the through hole 131 on piston 13 is by the ante-chamber of lift cylinder 1 and back cavity conducting.
When lift cylinder 1 carries out perching knife lifting operation, piston 13 moves towards back cylinder cover 15 under the promotion of ante-chamber hydraulic oil, when piston 13 is close to back cylinder cover 15, first the valve rod 34 of trimmer valve 3 contacts and is resisted against on back cylinder cover 15, then spool 32 is relative with the position of the cylinder body of lift cylinder 1 fixing; Piston 13 continues to move towards the direction of back cylinder cover 15, and then drives valve seat 31 to move backward, then spool 32 is separated with the junction of valve rod 34 and the end of valve pocket 33, and the through hole 131 on piston 13 is opened, so that by the ante-chamber of lift cylinder 1 and back cavity conducting.
Incorporated by reference to Fig. 3, when ante-chamber and the back cavity conducting of one of them lift cylinder 1, when another lift cylinder 1 needs to stretch out, the ante-chamber fluid of this another lift cylinder 1 stretched out flow to and is provided with in the lift cylinder 1 of trimmer valve 3, then the back cavity of this lift cylinder 1 is flowed into by trimmer valve 3, and then flow to the back cavity of the lift cylinder 1 stretched out, therefore need the lift cylinder 1 stretched out successfully to stretch out, moment of torsion can not be produced in its hinged place.
In addition, be provided with in the lift cylinder 1 of trimmer valve 3, due to the conducting of its ante-chamber and back cavity, therefore there is not pressure differential in the both sides of its piston 13, and when carrying out inclination operation, the lift cylinder 1 of this side does not exist the problem of stretching out or retracting, and more can not produce moment of torsion.
Visible, by arranging trimmer valve 3 on lift cylinder 1, when lift cylinder 1 is in the extreme position of retraction, even if carry out tilt operation, lift cylinder 1 also can complete normal flexible, can not produce moment of torsion at lift cylinder 1 and the hinged place of front hood, also just avoid the problem accordingly such as the distortion of front hood and fatigue fracture.
Can expect, the second one way valve 14 can also be set between the back cavity hydraulic fluid port B2 of lift cylinder 1 and fuel tank 9, to its back cavity repairing; Need to there is difference in volume between the chamber, front and back of the lift cylinder 1 stretched out, its back cavity almost becomes vacuum state, and now the second one way valve 14 is opened, and the fluid in fuel tank 9 flows in its back cavity, plays the effect of repairing, and service hoisting oil cylinder 1 stretches out.
Another object of the present invention is to provide a kind of bulldozer, comprises the control system of carrying out shovel blade inclination, and described control system is the control system described in above-mentioned any one.
Because bulldozer of the present invention has the control system described in above-mentioned any one, therefore the technique effect that the control system described in above-mentioned any one produces all is applicable to bulldozer of the present invention, repeats no more herein.
Above the control system of bulldozer provided by the present invention and shovel blade inclination thereof is described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands core concept of the present invention for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a control system for bulldozer perching knife inclination, described control system comprises the lift cylinder (1) of fuel tank (9) and two parallel connections, it is characterized in that,
Described control system is also provided with hydraulic operated valve (6), the oil-in of described hydraulic operated valve (6) is communicated with described fuel tank (9) with the back cavity hydraulic fluid port (B2) of described lift cylinder (1) respectively with oil-out, when the back cavity oil pressure of described lift cylinder (1) reaches predetermined value, described hydraulic operated valve (6) is in and is communicated with position, when the back cavity oil pressure of described lift cylinder (1) is lower than described predetermined value, described hydraulic operated valve (6) is in and disconnects position.
2. control system as claimed in claim 1, it is characterized in that, described control system also comprises the first hydraulic control one-way valve (11), the front end of described lift cylinder (1) has default hydraulic fluid port (16), the oil pressure of described default hydraulic fluid port (16) is corresponding with described predetermined value, the oil-in of described first hydraulic control one-way valve (11) is communicated with the ante-chamber hydraulic fluid port (A2) of described default hydraulic fluid port (16) and described lift cylinder (1) respectively with control port, the oil-out of described first hydraulic control one-way valve (11) is communicated with the position control port that is communicated with of described hydraulic operated valve (6).
3. control system as claimed in claim 2, it is characterized in that, described control system also comprises the first one way valve (12), the oil-in of described first one way valve (12) is communicated with described default hydraulic fluid port (16), and the oil-out of described first one way valve (12) is communicated with the oil-in of described first hydraulic control one-way valve (11) and the ante-chamber hydraulic fluid port (A2) of described lift cylinder (1) respectively.
4. control system as claimed in claim 1, it is characterized in that, described control system also comprises dump ram (4), and the oil-in of described dump ram (4) is communicated with the disconnection position control port of described hydraulic operated valve (6).
5. control system as claimed in claim 4, it is characterized in that, the disconnection position control port of described hydraulic operated valve (6) be communicated with position control port and be communicated with described fuel tank (9) with the second hydraulic control one-way valve (8) respectively by damping hole (2), the tilt oil of described second hydraulic control one-way valve (8) by described dump ram (4) and the ante-chamber oil pressure cntrol of described lift cylinder (1).
6. control system as claimed in claim 5, it is characterized in that, described control system also comprises the first shuttle valve (5), two oil-ins of described first shuttle valve (5) are communicated with the ante-chamber hydraulic fluid port (A2) of described lift cylinder (1) with the oil-in of described dump ram (4) respectively, and the oil-out of described first shuttle valve (5) is communicated with the control port of described second hydraulic control one-way valve (8).
7. the control system as described in any one of claim 1-6, it is characterized in that, also comprise trimmer valve (3), the piston (13) of lift cylinder described in one of them (1) has through hole (131), described trimmer valve (3) comprises valve seat (31) and spool (32), described valve seat (31) coordinates with described through hole (131) and has valve pocket (33), the length of described spool (32) is less than described valve pocket (33), the two ends of described spool (42) have the valve rod (34) passing described valve seat (31) protruding setting, the total length of described valve rod (34) and described spool (32) is greater than the thickness of described piston (13), described spool (32) can coordinate with the two ends of described valve pocket (33) respectively with the junction of described valve rod (34).
8. control system as claimed in claim 7, is characterized in that having the second one way valve (14) between the back cavity hydraulic fluid port (B2) of described lift cylinder (1) and described fuel tank (9).
9. control system as claimed in claim 7, it is characterized in that, described control system also comprises electromagnetism float trap (10), and the ante-chamber hydraulic fluid port (A2) of described lift cylinder (1) is communicated with two hydraulic fluid ports of electromagnetism float trap (10) respectively with back cavity hydraulic fluid port (B2).
10. a bulldozer, comprises the control system of carrying out shovel blade inclination, it is characterized in that, described control system is the control system described in above-mentioned any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310254664.6A CN103290869B (en) | 2013-06-24 | 2013-06-24 | The control system of a kind of bulldozer and shovel blade inclination thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310254664.6A CN103290869B (en) | 2013-06-24 | 2013-06-24 | The control system of a kind of bulldozer and shovel blade inclination thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103290869A CN103290869A (en) | 2013-09-11 |
| CN103290869B true CN103290869B (en) | 2015-08-12 |
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| CN201310254664.6A Active CN103290869B (en) | 2013-06-24 | 2013-06-24 | The control system of a kind of bulldozer and shovel blade inclination thereof |
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| CN106468062B (en) * | 2016-09-22 | 2018-09-11 | 柳州柳工挖掘机有限公司 | Excavator soil-shifting hydraulic system with dozer float function |
| CN106593981A (en) * | 2016-12-15 | 2017-04-26 | 北汽福田汽车股份有限公司 | Sweeping plate lifting hydraulic system, sweeping machine hydraulic system and sweeping machine |
| CN106836338B (en) * | 2017-03-30 | 2022-08-02 | 徐州徐工筑路机械有限公司 | Land leveler scraper knife side-standing control system |
| CN111155579A (en) * | 2020-01-16 | 2020-05-15 | 山推工程机械股份有限公司 | Foldable dozer blade, control system and bull-dozer |
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| US6129158A (en) * | 1996-12-27 | 2000-10-10 | Komatsu Ltd. | Hydraulic system for bulldozer |
| CN2900630Y (en) * | 2006-04-25 | 2007-05-16 | 孙志勇 | Front leveling device for land leveller |
| CN202298699U (en) * | 2011-08-18 | 2012-07-04 | 山推工程机械股份有限公司 | Quick-steering hydraulic device of land leveler |
| CN103046593A (en) * | 2012-12-24 | 2013-04-17 | 三一重工股份有限公司 | Scraper auto-lifting system and method and engineering machinery |
| CN202936824U (en) * | 2012-12-06 | 2013-05-15 | 山推工程机械股份有限公司 | Bulldozer shovel blade slant operating device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015473A (en) * | 2012-12-10 | 2013-04-03 | 三一重机有限公司 | Priority control method of excavator and movable arm to rotation and priority valve |
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| US6129158A (en) * | 1996-12-27 | 2000-10-10 | Komatsu Ltd. | Hydraulic system for bulldozer |
| CN2900630Y (en) * | 2006-04-25 | 2007-05-16 | 孙志勇 | Front leveling device for land leveller |
| CN202298699U (en) * | 2011-08-18 | 2012-07-04 | 山推工程机械股份有限公司 | Quick-steering hydraulic device of land leveler |
| CN202936824U (en) * | 2012-12-06 | 2013-05-15 | 山推工程机械股份有限公司 | Bulldozer shovel blade slant operating device |
| CN103046593A (en) * | 2012-12-24 | 2013-04-17 | 三一重工股份有限公司 | Scraper auto-lifting system and method and engineering machinery |
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