CN104500485A - Hydraulic system for floating of scraper of pavement milling machine - Google Patents
Hydraulic system for floating of scraper of pavement milling machine Download PDFInfo
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- CN104500485A CN104500485A CN201410818484.0A CN201410818484A CN104500485A CN 104500485 A CN104500485 A CN 104500485A CN 201410818484 A CN201410818484 A CN 201410818484A CN 104500485 A CN104500485 A CN 104500485A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
- E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
- E01C23/088—Rotary tools, e.g. milling drums
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
Abstract
The invention discloses a hydraulic system for the floating of a scraper of a pavement milling machine. The hydraulic system comprises a scraper oil cylinder with a piston rod which is vertically arranged downwards, wherein the piston rod of the scraper oil cylinder is connected with the scraper which is horizontally arranged; two oil paths are led from an upper cavity of the scraper oil cylinder, one path is communicated with a first oil port (A) of a three-position four-way electromagnetic reversing valve (5), and the other path is communicated with an oil tank through a throttling valve (4); a lower cavity of the scraper oil cavity is divided into two paths after passing through a two-position two-way electromagnetic valve (6), one path is communicated with a second oil port (B) of the three-position four-way electromagnetic reversing valve (5), and the other is communicated with an oil outlet of a three-way pressure reducing valve (3); an oil inlet (P) of the three-position three-way electromagnetic reversing valve (5) is communicated with the oil tank through an auxiliary pump (1), and an oil outlet(T) of the three-position three-way electromagnetic reversing valve (5) is communicated with the oil tank; an oil inlet of the three-way pressure reducing valve (3) is communicated withthe oil tank through an oil supplementing pump (2). The hydraulic system for the floating of the scraper of the pavement milling machine is simple in structure, safe and reliable.
Description
Technical field
The present invention relates to a kind of hydraulic system, the scraper plate especially related on a kind of road pavement milling machine carries out the hydraulic system waiting and control of floating, and belongs to milling machine technical field.
Background technique
Pavement milling machine, when construction operation, is compressed road surface by scraper plate and guarantees that the material that milling goes out is stayed in milling storehouse, be then transported on truck by conveying frame and transport.When the impacting force of scraper plate to ground is excessive, though rewinding is clean, brings additional friction to the advance of milling machine, consume engine power in a large number, wheel is skidded in the process of advancing, even causes scraper plate to be out of shape; When the impacting force of scraper plate road pavement is too small, although milling machine advance resistance diminishes, the impacting force of road pavement is too small, causes rewinding unclean, cleaning works amount is strengthened.Existing pavement milling machine mainly relies on the weight of scraper plate to realize the compression of road pavement, there is the uncontrollable defect of impacting force of scraper plate road pavement;
There is company to have developed as disclosed in Chinese patent 201310114673.5 a kind of " pavement milling machine self feed back float scraper system " for this reason, it utilizes the automatically controlled mode such as CPU, pressure transducer to control scraper plate, but find in actual use, because work progress is a kind of process moved ahead dynamically, and the pressure transducer of routine has good pressure detectivity when static state, but in moving process, especially, when it needs pressure and the movement direction measured mutual vertical, measurement error is larger; And at construction site, because the impurity such as dust are more, adopt many electronic parts and components easily to damage because of the erosion of dust or short circuit in automatically controlled mode, thus make its reliability poor.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, the road-surface milling machine scraper floating hydraulic system providing a kind of structure simple and safe and reliable.
The object of the present invention is achieved like this:
A kind of road-surface milling machine scraper floating hydraulic system, described system includes the scraper plate oil cylinder that piston rod is vertically arranged downwards, and the piston rod of scraper plate oil cylinder is connected with horizontally disposed scraper plate, the epicoele of scraper plate oil cylinder leads to two-way oil circuit, one tunnel is communicated to the hydraulic fluid port one of three-position four-way electromagnetic directional valve, another road is communicated to fuel tank through throttle valve, the cavity of resorption of scraper plate oil cylinder is divided into two-way after 2/2-way solenoid valve, one tunnel is communicated to the hydraulic fluid port two of three-position four-way electromagnetic directional valve, and another road is communicated to the oil outlet of three-way pressure reducing valve; The filler opening of above-mentioned three-position four-way electromagnetic directional valve is communicated to fuel tank through service pump, and the oil outlet of three-position four-way electromagnetic directional valve is communicated to fuel tank; The filler opening of above-mentioned three-way pressure reducing valve is communicated to fuel tank through slippage pump.
A kind of road-surface milling machine scraper of the present invention floating hydraulic system, the oil outlet of described service pump is connected to a pressure controlled valve, this pressure controlled valve includes solenoid directional control valve and relief valve, the filler opening of described solenoid directional control valve is communicated to the oil outlet of service pump, the oil outlet of described solenoid directional control valve is communicated to fuel tank, two other hydraulic fluid port of described solenoid directional control valve is plugged with plug and carries out shutoff, the oil outlet of service pump is communicated to fuel tank through relief valve.
A kind of road-surface milling machine scraper of the present invention floating hydraulic system, the oil outlet of described service pump is also communicated to the oil cylinder on milling machine; Slippage pump is also communicated to the closed type hydraulic system on milling machine.
A kind of road-surface milling machine scraper of the present invention floating hydraulic system, the control coil of above-mentioned solenoid directional control valve is control coil one, three-position four-way electromagnetic directional valve the control coil of the solenoid valve at hydraulic fluid port one place be control coil two, three-position four-way electromagnetic directional valve is control coil three at the control coil of the solenoid valve at hydraulic fluid port two place, the control coil of 2/2-way solenoid valve is control coil four;
When control coil one, control coil two and control coil four all electric, control coil three must not electricity time, the hydraulic fluid port one of three-position four-way electromagnetic directional valve is connected with oil outlet, hydraulic fluid port two is connected with filler opening, now, the hydraulic oil that service pump pumps into enters the cavity of resorption of scraper plate oil cylinder after three-position four-way electromagnetic directional valve and 2/2-way solenoid valve, and the hydraulic oil in scraper plate cylinder upper cavity oil flows back to fuel tank through three-position four-way electromagnetic directional valve, thus makes scraper plate be in lifting state.
A kind of road-surface milling machine scraper of the present invention floating hydraulic system, the control coil of above-mentioned solenoid directional control valve is control coil one, three-position four-way electromagnetic directional valve the control coil of the solenoid valve at hydraulic fluid port one place be control coil two, three-position four-way electromagnetic directional valve is control coil three at the control coil of the solenoid valve at hydraulic fluid port two place, the control coil of 2/2-way solenoid valve is control coil four;
When control coil one, control coil three and control coil four all electric, control coil two must not electricity time, the hydraulic fluid port one of three-position four-way electromagnetic directional valve is connected with filler opening, hydraulic fluid port two is connected with oil outlet, now, the hydraulic oil that service pump pumps into enters the epicoele of scraper plate oil cylinder through three-position four-way electromagnetic directional valve, and the hydraulic oil in scraper plate oil cylinder cavity of resorption flows back to fuel tank through 2/2-way solenoid valve and three-position four-way electromagnetic directional valve, thus makes scraper plate be in decline state.
A kind of road-surface milling machine scraper of the present invention floating hydraulic system, the control coil of above-mentioned solenoid directional control valve is control coil one, three-position four-way electromagnetic directional valve the control coil of the solenoid valve at hydraulic fluid port one place be control coil two, three-position four-way electromagnetic directional valve is control coil three at the control coil of the solenoid valve at hydraulic fluid port two place, the control coil of 2/2-way solenoid valve is control coil four;
When control coil one, control coil two, control coil three and control coil four all must not electricity time, the hydraulic oil that service pump pumps into flows back to fuel tank through solenoid directional control valve, the two-way path of three-position four-way electromagnetic directional valve is all in not on-state, 2/2-way solenoid valve is in cut-off state, thus the hydraulic oil in scraper plate oil cylinder cavity of resorption is in the lock state, achieve the lockup state of scraper plate.
A kind of road-surface milling machine scraper of the present invention floating hydraulic system, the control coil of above-mentioned solenoid directional control valve is control coil one, three-position four-way electromagnetic directional valve the control coil of the solenoid valve at hydraulic fluid port one place be control coil two, three-position four-way electromagnetic directional valve is control coil three at the control coil of the solenoid valve at hydraulic fluid port two place, the control coil of 2/2-way solenoid valve is control coil four;
When control coil one, control coil two and control coil three all must not be electric, when control coil four obtains electric, the hydraulic oil that service pump pumps into flows back to fuel tank through solenoid directional control valve, the two-way path of three-position four-way electromagnetic directional valve is all in not on-state, 2/2-way solenoid valve is on state, and the hydraulic oil that slippage pump pumps enters the cavity of resorption of scraper plate oil cylinder after three-way pressure reducing valve and 2/2-way solenoid valve; The epicoele of scraper plate oil cylinder is communicated to fuel tank through throttle valve; Thus make scraper plate be in quick condition.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention, in the work progress of milling machine, utilizes cavity of resorption that three-way pressure reducing valve, 2/2-way solenoid valve are scraper plate oil cylinder to provide the hydraulic oil of certain pressure, thus makes scraper plate be in quick condition; Alleviate the impacting force of scraper plate to ground, make scraper plate in work progress, have an applicable impacting force, both ensure that material was retained in groove milling, and turn avoid the resistance that moves ahead brought because of gravity; And this patent, by the control to three-position four-way electromagnetic directional valve, can realize the lifting to scraper plate, decline and locking easily, facilitate operator and operate.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of road-surface milling machine scraper of the present invention floating hydraulic system.
Wherein:
Service pump 1, slippage pump 2, three-way pressure reducing valve 3, throttle valve 4, three-position four-way electromagnetic directional valve 5,2/2-way solenoid valve 6, scraper plate oil cylinder one 7-1, scraper plate oil cylinder two 7-2, solenoid directional control valve 8-1, relief valve 8-2.
Embodiment
See Fig. 1, a kind of road-surface milling machine scraper floating hydraulic system that the present invention relates to, described system includes the scraper plate oil cylinder that piston rod is vertically arranged downwards, and the piston rod of scraper plate oil cylinder is connected (concretely with horizontally disposed scraper plate, scraper plate oil cylinder such as figure is provided with two, scraper plate oil cylinder one 7-1 and scraper plate oil cylinder two 7-2), the epicoele of scraper plate oil cylinder leads to two-way oil circuit, one tunnel is communicated to hydraulic fluid port one A of three-position four-way electromagnetic directional valve 5, another road is communicated to fuel tank through throttle valve 4, the cavity of resorption of scraper plate oil cylinder is divided into two-way after 2/2-way solenoid valve 6, one tunnel is communicated to hydraulic fluid port two B of three-position four-way electromagnetic directional valve 5, another road is communicated to the oil outlet (hydraulic fluid port 3 shown in figure) of three-way pressure reducing valve 3, the oil inlet P of above-mentioned three-position four-way electromagnetic directional valve 5 is communicated to fuel tank through service pump 1, and the oil outlet T of three-position four-way electromagnetic directional valve 5 is communicated to fuel tank, the filler opening (hydraulic fluid port 2 shown in figure) of above-mentioned three-way pressure reducing valve 3 is communicated to fuel tank through slippage pump 2, and the flow-off (hydraulic fluid port 1 shown in figure) of three-way pressure reducing valve 3 is communicated to fuel tank,
Simultaneously, the oil outlet of described service pump 1 is connected to a pressure controlled valve, this pressure controlled valve includes solenoid directional control valve 8-1 and relief valve 8-2, the filler opening of described solenoid directional control valve 8-1 is communicated to the oil outlet of service pump 1, the oil outlet of described solenoid directional control valve 8-1 is communicated to fuel tank, two other hydraulic fluid port of described solenoid directional control valve 8-1 is plugged with plug and carries out shutoff, the oil outlet of service pump 1 is communicated to fuel tank through relief valve 8-2; When solenoid directional control valve 8-1 must not electricity time, the pressure oil that the oil outlet of service pump 1 flows out flows back to fuel tank after solenoid directional control valve 8-1, when solenoid directional control valve 8-1 obtains electric, realizes by relief valve 8-2 control service pump 1 being gone out to oil pressure;
The oil outlet of above-mentioned service pump 1 is also communicated to all the other oil cylinders of milling machine; Slippage pump 2 is also simultaneously for all the other closed type hydraulic systems on milling machine provide repairing, that is, service pump 1 in this patent system and slippage pump 2 can share service pump in milling machine hydraulic system originally and slippage pump, thus for this patent, reduce the holistic cost of system, be also convenient to carry out upgrading to old equipment;
Working principle of the present invention is:
The control coil first defining above-mentioned solenoid directional control valve 8-1 is control coil one Y1, three-position four-way electromagnetic directional valve 5 the control coil of the solenoid valve at hydraulic fluid port one A place be control coil two Y2, three-position four-way electromagnetic directional valve 5 is control coil three Y3 at the control coil of the solenoid valve at hydraulic fluid port two B place, the control coil of 2/2-way solenoid valve 6 is control coil four Y4;
State one: as control coil one Y1, control coil two Y2 and control coil four Y4 all electric, control coil three Y3 must not electricity time, hydraulic fluid port one A of three-position four-way electromagnetic directional valve 5 is communicated with oil outlet T-phase, hydraulic fluid port two B is connected with oil inlet P, now, the hydraulic oil that service pump 1 pumps into keeps certain pressure after three-position four-way electromagnetic directional valve 5 and 2/2-way solenoid valve 6, enter the cavity of resorption of scraper plate oil cylinder under the Stress control of relief valve 8-2, hydraulic oil in scraper plate cylinder upper cavity oil flows back to fuel tank through three-position four-way electromagnetic directional valve 5, thus make scraper plate be in lifting state,
State two: when control coil one Y1, control coil three Y3 and control coil four Y4 all electric, control coil two Y2 must not electricity time, hydraulic fluid port one A of three-position four-way electromagnetic directional valve 5 is connected with oil inlet P, hydraulic fluid port two B is communicated with oil outlet T-phase, now, the hydraulic oil that service pump 1 pumps into keeps certain pressure to enter the epicoele of scraper plate oil cylinder through three-position four-way electromagnetic directional valve 5 under the Stress control of relief valve 8-2, hydraulic oil in scraper plate oil cylinder cavity of resorption flows back to fuel tank through 2/2-way solenoid valve 6 and three-position four-way electromagnetic directional valve 5, thus makes scraper plate be in decline state;
State three: when control coil one Y1, control coil two Y2, control coil three Y3 and control coil four Y4 all must not electricity time, the hydraulic oil that service pump 1 pumps into flows back to fuel tank through solenoid directional control valve 8-1, and (now relief valve 8-2 is in bypass state, service pump 1 outlet pressure is very low, realize energy-conservation), the two-way path of three-position four-way electromagnetic directional valve 5 is all in not on-state, 2/2-way solenoid valve 6 is in cut-off state, thus the hydraulic oil in scraper plate oil cylinder cavity of resorption is in the lock state, achieve the lockup state of scraper plate;
State four: when control coil one Y1, control coil two Y2 and control coil three Y3 all must not be electric, when control coil four Y4 obtains electric, the hydraulic oil that service pump 1 pumps into flows back to fuel tank through solenoid directional control valve 8-1, the two-way path of three-position four-way electromagnetic directional valve 5 is all in not on-state, 2/2-way solenoid valve 6 is on state, and the hydraulic oil that slippage pump 2 pumps enters the cavity of resorption of scraper plate oil cylinder after three-way pressure reducing valve 3 and 2/2-way solenoid valve 6; The epicoele of scraper plate oil cylinder is communicated to fuel tank through throttle valve 4; Thus make scraper plate be in quick condition;
In state four, three-way pressure reducing valve 3 has following three kinds of working staties:
State A: static decompression, now flow is zero, and the pressure of oil outlet (hydraulic fluid port 3 shown in figure) maintains under setting pressure, and not by the impact of filler opening (hydraulic fluid port 2 shown in figure) pressure surge;
State B: dynamic pressure reduction, now hydraulic oil flows from filler opening (hydraulic fluid port 2 shown in figure) to oil outlet (hydraulic fluid port 3 shown in figure), now from realized function, is equivalent to a traditional two-way reduction valve;
State C: overflow pattern, now the pressure of the hydraulic oil of oil outlet (hydraulic fluid port 3 shown in figure) is greater than the predefined value of three-way pressure reducing valve 3, and now hydraulic oil flows from oil outlet (hydraulic fluid port 3 shown in figure) to flow-off (hydraulic fluid port 1 shown in figure) and carries out overflow;
In addition: it should be noted that above-mentioned embodiment is only an optimized project of this patent, any change that those skilled in the art does according to above-mentioned design or improvement, all within the protection domain of this patent.
Claims (7)
1. a road-surface milling machine scraper floating hydraulic system, it is characterized in that: described system includes the scraper plate oil cylinder that piston rod is vertically arranged downwards, and the piston rod of scraper plate oil cylinder is connected with horizontally disposed scraper plate, the epicoele of scraper plate oil cylinder leads to two-way oil circuit, one tunnel is communicated to the hydraulic fluid port one (A) of three-position four-way electromagnetic directional valve (5), another road is communicated to fuel tank through throttle valve (4), the cavity of resorption of scraper plate oil cylinder is divided into two-way after 2/2-way solenoid valve (6), one tunnel is communicated to the hydraulic fluid port two (B) of three-position four-way electromagnetic directional valve (5), another road is communicated to the oil outlet of three-way pressure reducing valve (3), the filler opening (P) of above-mentioned three-position four-way electromagnetic directional valve (5) is communicated to fuel tank through service pump (1), and the oil outlet (T) of three-position four-way electromagnetic directional valve (5) is communicated to fuel tank, the filler opening of above-mentioned three-way pressure reducing valve (3) is communicated to fuel tank through slippage pump (2).
2. a kind of road-surface milling machine scraper floating hydraulic system as claimed in claim 1, it is characterized in that: the oil outlet of described service pump (1) is connected to a pressure controlled valve, this pressure controlled valve includes solenoid directional control valve (8-1) and relief valve (8-2), the filler opening of described solenoid directional control valve (8-1) is communicated to the oil outlet of service pump (1), the oil outlet of described solenoid directional control valve (8-1) is communicated to fuel tank, two other hydraulic fluid port of described solenoid directional control valve (8-1) is plugged with plug and carries out shutoff, the oil outlet of service pump (1) is communicated to fuel tank through relief valve (8-2).
3. a kind of road-surface milling machine scraper floating hydraulic system as claimed in claim 1 or 2, is characterized in that: the oil outlet of described service pump (1) is also communicated to the oil cylinder on milling machine; Slippage pump (2) is also communicated to the closed type hydraulic system on milling machine.
4. a kind of road-surface milling machine scraper floating hydraulic system as claimed in claim 2, it is characterized in that: the control coil of above-mentioned solenoid directional control valve (8-1) is control coil one (Y1), three-position four-way electromagnetic directional valve (5) the control coil of the solenoid valve at hydraulic fluid port one (A) place be control coil two (Y2), three-position four-way electromagnetic directional valve (5) is control coil three (Y3) at the control coil of the solenoid valve at hydraulic fluid port two (B) place, the control coil of 2/2-way solenoid valve (6) is control coil four (Y4);
When control coil one (Y1), control coil two (Y2) and control coil four (Y4) all electric, control coil three (Y3) must not electricity time, the hydraulic fluid port one (A) of three-position four-way electromagnetic directional valve (5) is connected with oil outlet (T), hydraulic fluid port two (B) is connected with filler opening (P), now, the hydraulic oil that service pump (1) pumps into enters the cavity of resorption of scraper plate oil cylinder after three-position four-way electromagnetic directional valve (5) and 2/2-way solenoid valve (6), hydraulic oil in scraper plate cylinder upper cavity oil flows back to fuel tank through three-position four-way electromagnetic directional valve (5), thus make scraper plate be in lifting state.
5. a kind of road-surface milling machine scraper floating hydraulic system as claimed in claim 2, it is characterized in that: the control coil of above-mentioned solenoid directional control valve (8-1) is control coil one (Y1), three-position four-way electromagnetic directional valve (5) the control coil of the solenoid valve at hydraulic fluid port one (A) place be control coil two (Y2), three-position four-way electromagnetic directional valve (5) is control coil three (Y3) at the control coil of the solenoid valve at hydraulic fluid port two (B) place, the control coil of 2/2-way solenoid valve (6) is control coil four (Y4);
When control coil one (Y1), control coil three (Y3) and control coil four (Y4) all electric, control coil two (Y2) must not electricity time, the hydraulic fluid port one (A) of three-position four-way electromagnetic directional valve (5) is connected with filler opening (P), hydraulic fluid port two (B) is connected with oil outlet (T), now, the hydraulic oil that service pump (1) pumps into enters the epicoele of scraper plate oil cylinder after three-position four-way electromagnetic directional valve (5), hydraulic oil in scraper plate oil cylinder cavity of resorption flows back to fuel tank after 2/2-way solenoid valve (6) and three-position four-way electromagnetic directional valve (5), thus make scraper plate be in decline state.
6. a kind of road-surface milling machine scraper floating hydraulic system as claimed in claim 2, it is characterized in that: the control coil of above-mentioned solenoid directional control valve (8-1) is control coil one (Y1), three-position four-way electromagnetic directional valve (5) the control coil of the solenoid valve at hydraulic fluid port one (A) place be control coil two (Y2), three-position four-way electromagnetic directional valve (5) is control coil three (Y3) at the control coil of the solenoid valve at hydraulic fluid port two (B) place, the control coil of 2/2-way solenoid valve (6) is control coil four (Y4);
When control coil one (Y1), control coil two (Y2), control coil three (Y3) and control coil four (Y4) all must not electricity time, the hydraulic oil that service pump (1) pumps into flows back to fuel tank through solenoid directional control valve 8-1, the two-way path of three-position four-way electromagnetic directional valve (5) is all in not on-state, 2/2-way solenoid valve (6) is in cut-off state, thus the hydraulic oil in scraper plate oil cylinder cavity of resorption is in the lock state, achieve the lockup state of scraper plate.
7. a kind of road-surface milling machine scraper floating hydraulic system as claimed in claim 2, it is characterized in that: the control coil of above-mentioned solenoid directional control valve (8-1) is control coil one (Y1), three-position four-way electromagnetic directional valve (5) the control coil of the solenoid valve at hydraulic fluid port one (A) place be control coil two (Y2), three-position four-way electromagnetic directional valve (5) is control coil three (Y3) at the control coil of the solenoid valve at hydraulic fluid port two (B) place, the control coil of 2/2-way solenoid valve (6) is control coil four (Y4);
When control coil one (Y1), control coil two (Y2) and control coil three (Y3) all must not be electric, when control coil four (Y4) obtains electric, the hydraulic oil that service pump (1) pumps into flows back to fuel tank through solenoid directional control valve 8-1, the two-way path of three-position four-way electromagnetic directional valve (5) is all in not on-state, 2/2-way solenoid valve (6) is on state, and the hydraulic oil that slippage pump (2) pumps enters the cavity of resorption of scraper plate oil cylinder after three-way pressure reducing valve (3) and 2/2-way solenoid valve (6); The epicoele of scraper plate oil cylinder is communicated to fuel tank through throttle valve (4); Thus make scraper plate be in quick condition.
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| CN201410818484.0A CN104500485B (en) | 2014-12-25 | 2014-12-25 | A kind of road-surface milling machine scraper floating hydraulic system |
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| CN201410818484.0A CN104500485B (en) | 2014-12-25 | 2014-12-25 | A kind of road-surface milling machine scraper floating hydraulic system |
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Cited By (5)
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| CN105156381A (en) * | 2015-09-25 | 2015-12-16 | 湖北合加环境设备有限公司 | Suction nozzle balance device for special sanitation truck |
| CN108316096A (en) * | 2018-01-22 | 2018-07-24 | 柳工无锡路面机械有限公司 | A kind of sub-base grader integrated control hydraulic system and its control method |
| CN108561466A (en) * | 2018-05-07 | 2018-09-21 | 宁夏天地奔牛实业集团有限公司 | Suitable for underground coal mine scraper conveyor power part clutch and brake chain tightener |
| CN110094376A (en) * | 2019-06-10 | 2019-08-06 | 徐州徐工筑路机械有限公司 | A kind of milling mechanism side plate floating type controlled system |
| CN112663470A (en) * | 2019-10-15 | 2021-04-16 | 维特根有限公司 | Self-propelled construction machine |
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