CN113803330A - Hydraulic control system and milling machine - Google Patents
Hydraulic control system and milling machine Download PDFInfo
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- CN113803330A CN113803330A CN202111127875.4A CN202111127875A CN113803330A CN 113803330 A CN113803330 A CN 113803330A CN 202111127875 A CN202111127875 A CN 202111127875A CN 113803330 A CN113803330 A CN 113803330A
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- 238000003801 milling Methods 0.000 title claims abstract description 39
- 239000003921 oil Substances 0.000 claims description 147
- 230000001502 supplementing effect Effects 0.000 claims description 44
- 239000010724 circulating oil Substances 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 230000009469 supplementation Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 11
- 239000010720 hydraulic oil Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
- F15B11/0426—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling the number of pumps or parallel valves switched on
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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
-
- 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
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic control system and a milling machine, wherein the hydraulic system comprises an oil tank, a control valve group, a plunger pump and a low-speed motor, wherein the plunger pump is respectively communicated with the oil tank, the control valve group and the low-speed motor; the control valve group is communicated with the low-speed motor and is used for controlling the working condition of the low-speed motor; the control valve group comprises a first two-position three-way reversing valve and a second two-position three-way reversing valve; the low-speed motor is controlled to be in marking line clearing operation, shallow milling operation and deep milling operation through the control valve group, so that the operation quality is effectively improved, and the operation efficiency is improved.
Description
Technical Field
The invention relates to the technical field of milling device drive control, in particular to a hydraulic control system and a milling machine.
Background
Due to changes in traffic management schemes, etc., it is often necessary to remove the original road markings. If the original marked lines are not thoroughly removed, the traffic safety and traffic control are very unfavorable. If the marked line is damaged in the removing process, the road maintenance cost is increased, the conventional domestic construction schemes comprise polishing, milling, high-pressure water jet, and the like, the construction efficiency is low, and certain pollution is caused to the environment
The milling machine is a special mechanical device for maintenance operation of highways and urban roads, is widely applied to excavation and renovation of asphalt concrete surface layers of highways, airports, wharfs, parking lots and the like, removal of pavement diseases, road repair under the condition of damaged roadbed and the like, is applied to removal of marked lines, and develops the innovatively researched milling machine to the direction of environmental protection, high efficiency and automation.
Disclosure of Invention
The invention aims to provide a hydraulic control system and a milling machine, and aims to solve the problems of low efficiency and nonadjustable speed caused by the conventional processes of grinding, milling and high-pressure water jetting for removing a marking line in the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a hydraulic control system comprises an oil tank, a control valve group, a plunger pump and a low-speed motor, wherein the plunger pump is respectively communicated with the oil tank, the control valve group and the low-speed motor, and the low-speed motor is communicated with the oil tank;
the control valve group is communicated with the low-speed motor and is used for controlling the working condition of the low-speed motor; the control valve group comprises a first two-position three-way reversing valve and a second two-position three-way reversing valve;
when the electromagnet Y of the first two-position three-way reversing valve is powered off and the electromagnet Y of the second two-position three-way reversing valve is powered on, the low-speed motor is in a marking line clearing working condition;
when the electromagnet Y of the first two-position three-way reversing valve is powered off and the electromagnet Y of the second two-position three-way reversing valve is powered off, the low-speed motor is in a shallow milling operation working condition;
when the electromagnet Y of the first two-position three-way reversing valve is electrified and the electromagnet Y of the second two-position three-way reversing valve is not electrified, the low-speed motor is in a deep milling operation working condition.
Furthermore, the plunger pump comprises a main pump and an oil supplementing pump, an oil inlet of the oil supplementing pump is communicated with an oil tank, an oil outlet of the oil supplementing pump is communicated with the main pump through a proportional valve for stepless speed regulation, and an oil outlet of the oil supplementing pump is communicated with the first two-position three-way reversing valve and the second two-position three-way reversing valve;
and the low-pressure side and the high-pressure side of the main pump are communicated with the low-speed motor.
Furthermore, an oil port at one end of the first oil-supplementing overflow valve and an oil port at one end of the second oil-supplementing overflow valve are both communicated with the oil-supplementing pump, an oil port at the other end of the first oil-supplementing overflow valve is connected to the low-pressure side of the main pump, and an oil port at the other end of the second oil-supplementing overflow valve is connected to the high-pressure side of the main pump, so that high-pressure side overflow and low-pressure side oil supplementation of a circulating oil path between the main pump and the low-speed motor are realized.
Further, the system also comprises an oil supplementing pump overflow valve used for limiting the highest pressure of the oil supplementing pump;
the oil supplementing pump overflow valve is arranged between the oil supplementing pump and the proportional valve, the oil supplementing pump overflow valve is arranged between the oil supplementing pump and the first two-position three-way reversing valve and the second two-position three-way reversing valve, and the oil supplementing pump overflow valve is arranged between the oil supplementing pump and the first oil supplementing overflow valve and the second oil supplementing overflow valve.
Further, the cut-off overflow valve is connected between the main pump and the low-speed motor, so that overload and overpressure protection of a circulating oil path between the main pump and the low-speed motor is realized.
And the system further comprises a first pressure gauge connected to the proportional valve and used for observing the oil supplementing pressure of the main pump, a second pressure gauge connected to the high-pressure side of the main pump and used for observing the high-pressure of the main pump, and a third pressure gauge connected to the low-pressure side of the main pump and used for observing the low-pressure of the main pump.
And the flushing valve is respectively communicated with the oil tank and the low-pressure side and the high-pressure side of the main pump.
Furthermore, an oil suction filter is arranged between an oil inlet of the oil supplementing pump in the plunger pump and the oil tank, and an oil return port of the low-speed motor and an oil return port of the control valve group are communicated with the oil tank through the oil return filter.
The invention also discloses a milling machine, which comprises the hydraulic control system.
According to the technical scheme, the embodiment of the invention at least has the following effects:
1. according to the hydraulic control system, the low-speed motor is in different working conditions through the first two-position three-way reversing valve and the second two-position three-way reversing valve in the plunger pump control valve bank, and when an electromagnet Y3 of the first two-position three-way reversing valve is powered off and an electromagnet Y4 of the second two-position three-way reversing valve is powered on, the low-speed motor is in a marking line clearing working condition; when the electromagnet Y3 of the first two-position three-way reversing valve is powered off and the electromagnet Y4 of the second two-position three-way reversing valve is powered off, the low-speed motor is in a shallow milling operation working condition; when the electromagnet Y3 of the first two-position three-way reversing valve is electrified and the electromagnet Y4 of the second two-position three-way reversing valve is not electrified, the low-speed motor is in a deep milling operation working condition; the efficiency of marking removal is improved, and the problem that the speed of the low-speed motor is not adjustable is solved;
2. the plunger pump comprises an oil supplementing pump, a proportional valve and a main pump, and the main pump is controlled by the proportional valve to supply oil to the low-speed motor so as to drive the low-speed motor to rotate, so that the rotating speed of the low-speed motor can be conveniently adjusted;
3. the overflow valve is cut off, so that overload and overpressure protection of a circulating oil path between the main pump and the low-speed motor can be realized, when the system is impacted by load, the valve is used for realizing pressure cut-off, the discharge capacity of the main pump returns to zero, and the milling drum stops rotating, so that the protection of the system is effectively realized.
Drawings
FIG. 1 is a schematic diagram of a remote control system according to an embodiment of the present invention.
Wherein: 1. an oil tank; 2. an oil absorption filter; 3. cutting off the overflow valve; 4. an overflow valve of the oil replenishing pump; 5. a first oil-replenishing overflow valve; 6. a second oil-supplementing overflow valve; 7. a main pump; 8. a plunger pump; 9. a proportional valve; 10. a first pressure gauge; 11. a control valve group; 12. a two-position three-way reversing valve; 13. a second two-position three-way reversing valve; 14. a second pressure gauge; 15. a flush valve; 16. a low-speed motor; 17. a first two-position three-way valve; 18. a second two-position three-way valve; 19. a third pressure gauge; 20. an oil replenishing pump; 21. and an oil return filter.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1, the present invention provides a hydraulic control system, which includes an oil tank 1, an oil suction filter 2, a plunger pump 8, a control valve group 11, a flush valve 15, a low-speed motor 16, an oil return filter 21, and the like.
The low-speed motor 16 has three displacement levels, and the gear switching is realized through the logic control of the first two-position three-way valve 17, the second two-position three-way valve 18 and the control valve group 11, so that the multi-gear setting of the milling device driving system can be realized. The displacement of the low-speed motor 16 is controlled at three different levels to correspond to three operating conditions, as follows:
the marking line clears the working condition, the oil supplementing pump 20 absorbs oil from the oil tank 1 through the oil absorption filter 2, the electromagnet Y1 of the proportional valve 9 is electrified, the Y2 is electrified, the electromagnet Y3 of the two-position three-way reversing valve 12 is electrified, the electromagnet Y4 of the two-position three-way reversing valve 13 is electrified, one path of hydraulic oil sucked by the oil supplementing pump 20 from the oil tank is supplied to a servo oil cylinder of the main pump 7 through the proportional valve and is used for controlling the displacement change of the main pump, the other path of hydraulic oil is supplied to a first two-position three-way valve 17 of the low-speed motor through the two-position three-way reversing valve 13, the function of the first two-position three-way valve 17 is positioned at the upper position, the displacement of the low-speed motor is switched to the minimum displacement value of one gear, the hydraulic oil of the main pump 7 is supplied to the low-speed motor 16, the low-speed motor is positioned at the highest rotating speed gear and drives the low-speed motor 16 to rotate at high speed, the highest rotating speed of the high-speed milling drum can reach 300r/min, the requirements of the actual working quality, the working efficiency and the tool bit wear degree can be comprehensively evaluated, the milling drum speed is suitably reduced by adjusting the value of the current of the proportional valve 9.
The shallow milling operation working condition is that an oil supplementing pump 20 absorbs oil from an oil tank 1 through an oil absorption filter 2, an electromagnet Y1 of a proportional valve 9 is electrified, an electromagnet Y2 is electrified, an electromagnet Y3 of a two-position three-way reversing valve 12 is electrified, an electromagnet Y4 of a two-position three-way reversing valve 13 is electrified, hydraulic oil sucked from the oil tank by the oil supplementing pump 20 is supplied to a servo oil cylinder of a main pump 7 through the proportional valve and used for controlling displacement change of the main pump, the displacement of a low-speed motor is at a second-gear displacement value, the oil of the main pump 7 is supplied to a low-speed motor 16, the low-speed motor is at a middle rotating speed gear and drives the low-speed motor 16 to rotate at a medium rotating speed, the maximum rotating speed of a milling drum can reach 150r/min, actual operation quality, operation efficiency and tool bit abrasion degree requirements can be comprehensively evaluated, and the rotating speed of the milling drum can be properly reduced by adjusting the current value of the proportional valve 9.
Under the working condition of deep milling and planing, an oil supplementing pump 20 absorbs oil from an oil tank 1 through an oil absorption filter 2, a proportional valve 9 electromagnet Y1 is electrified, a Y2 is deenergized, a two-position three-way reversing valve 12 electromagnet Y3 is electrified, a two-position three-way reversing valve 13 electromagnet Y4 is deenergized, one path of hydraulic oil sucked by the oil supplementing pump 20 from the oil tank is supplied to a servo oil cylinder of a main pump 7 through the proportional valve and is used for controlling the displacement change of the main pump, the other path of hydraulic oil is supplied to a second two-position three-way valve 18 of a low-speed motor through the two-position three-way reversing valve 12, the function of the second two-position three-way valve 18 is positioned at the lower position, the displacement of the low-speed motor is switched to the maximum displacement value of one gear, the hydraulic oil of the main pump 7 is supplied to the low-speed motor 16, the low-speed motor is positioned at the lowest rotating speed gear and drives the low-speed motor 16 to rotate at a high speed, the highest rotating speed of a low-speed milling drum can reach 100r/min, the requirements of actual working quality, working efficiency and the tool bit wear degree can be comprehensively evaluated, the milling drum speed is suitably reduced by adjusting the value of the current of the proportional valve 9.
The milling device has three working states, namely marking line removing operation, shallow milling operation and deep milling operation. And selecting different milling drum rotating speeds according to the actual working condition requirements, and carrying out related construction operation.
In some further embodiments, the plunger pump 8 is integrated with a main pump 7, an oil supply pump 20, a first oil supply overflow valve 5, a second oil supply overflow valve 6, an oil supply overflow valve 4, a shut-off overflow valve 3, and a proportional valve 9.
An oil inlet of an oil supplementing pump 20 is communicated with the oil tank 1, an oil outlet of the oil supplementing pump 20 is communicated with a main pump 7 through a proportional valve 9, an oil outlet of the oil supplementing pump 20 is communicated with a first two-position three-way reversing valve 12 and a second two-position three-way reversing valve 13, and an oil outlet of the oil supplementing pump 20 is communicated with a first oil supplementing overflow valve 5 and a second oil supplementing overflow valve 6. The oil-replenishing pump overflow valve 4 is connected to the oil outlet end of the oil-replenishing pump 20 and is positioned at the oil inlet ends of the proportional valve 9, the first two-position three-way reversing valve 12, the second two-position three-way reversing valve 13, the first oil-replenishing overflow valve 5 and the second oil-replenishing overflow valve 6. Both the low-pressure side and the high-pressure side of the main pump 7 communicate with a low-speed motor 16.
The proportional valve 9 can control and realize stepless speed regulation of the working device, the first oil supplementing overflow valve 5 and the second oil supplementing overflow valve 6 can realize high-pressure safe unloading and low-pressure side oil supplementing of the driving system, the oil supplementing pump overflow valve 4 can realize pressure limitation of the oil supplementing pump 20, and the cut-off overflow valve 3 can realize overload protection of the driving system.
The relief valve 3 is cut off, so that overload and overpressure protection of a circulating oil path between the main pump 7 and the low-speed motor 16 can be realized, when the system encounters load impact, the valve realizes pressure cut-off, the discharge capacity of the main pump 7 returns to zero, and the milling drum stops rotating.
The oil-supplementing overflow valve 5 and the oil-supplementing overflow valve 6 can realize high-pressure overflow of a circulating oil path between the main pump 7 and the low-speed motor 16, are used for overload protection, and can supplement oil to a low-pressure side through the oil-supplementing pump 20 to make up for leakage of hydraulic oil.
The overflow valve 4 of the oil supplementing pump is used for limiting the highest pressure of the oil supplementing pump 20 and ensuring that the oil supplementing pump 20 can realize the following three functions, namely, the main pump 7 controls the oil source supply, and the two-position three-way reversing valve 12 and the two-position three-way reversing valve 13 control the oil source of the oil path and the leakage of a supplementing system.
In some embodiments, the flushing valve 15 is in communication with the tank at one end and the low and high pressure sides of the main pump 7 at the other end. The flushing valve 15 can realize that the low-pressure side oil of the driving system is flushed into the oil tank, so that the temperature of the hydraulic oil of the system is effectively reduced, and the purpose of radiating the system is achieved.
In some embodiments, the first pressure gauge 10, the second pressure gauge 14, and the third pressure gauge 19 can detect the critical pressures (oil supplementing pressure, high pressure, and low pressure) of the system, so as to monitor whether the system is operating normally and timely troubleshoot faults.
In some embodiments, the oil supply pump 20 sucks oil from the hydraulic oil tank 1 through the oil suction filter 2, so that the service life of the oil supply pump 20 is effectively protected.
In some embodiments, the return oil of the control valve group 11 and the return oil of the housing of the low-speed motor 16 return to the hydraulic oil tank through the return oil filter 21, so that the cleanliness of the system is effectively guaranteed, and the failure rate is reduced.
It can be seen from above structure that this application is through on original mill plane drum hydraulic control system basis, dispose 3 kinds of discharge capacity ranks with low-speed motor, through increasing two tee bend switching-over valves and controlling the discharge capacity switching of low-speed motor respectively, and then increase and mill the maximum rotational speed of plane drum, and realize that the rotational speed is three grades adjustable, and can mill plane drum rotational speed through the stepless adjustment of electric proportional pump at each gear according to construction work quality, operating efficiency and tool bit loss degree in the actual construction operation process. The system is provided with an oil suction filter and an oil return filter, so that the oil cleanliness of the whole system is effectively ensured. The system is provided with three pressure gauges, and the pressure of the oil supplementing pump, the high pressure of the main pump and the low pressure of the main pump can be checked in real time respectively, so that the operation of the system can be monitored in real time, and troubleshooting is facilitated.
The application also discloses a milling machine, this milling machine includes the hydraulic control system that the arbitrary embodiment of this application provided, and this application effectively expands milling machine construction operation scope, clears away the operation operating mode with the milling machine effective application marking, and can effectively promote the operating mass, improve the operating efficiency, saves tool bit wearing and tearing, effectively practices thrift construction operation cost, and the reinforcing series mills mechanical product market competition.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (9)
1. The hydraulic control system is characterized by comprising an oil tank (1), a control valve group (11), a plunger pump (8) and a low-speed motor (16), wherein the plunger pump (8) is respectively communicated with the oil tank (1), the control valve group (11) and the low-speed motor (16), and the low-speed motor (16) is communicated with the oil tank (1);
the control valve group (11) is communicated with the low-speed motor (16) and is used for controlling the working condition of the low-speed motor (16); the control valve group (11) comprises a first two-position three-way reversing valve (12) and a second two-position three-way reversing valve (13);
when the electromagnet Y3 of the first two-position three-way reversing valve (12) is powered off and the electromagnet Y4 of the second two-position three-way reversing valve (13) is powered on, the low-speed motor (16) is in a marking line clearing working condition;
when the electromagnet Y3 of the first two-position three-way reversing valve (12) is powered off and the electromagnet Y4 of the second two-position three-way reversing valve (13) is powered off, the low-speed motor (16) is in a shallow milling operation working condition;
when the electromagnet Y3 of the first two-position three-way reversing valve (12) is powered on and the electromagnet Y4 of the second two-position three-way reversing valve (13) is powered off, the low-speed motor (16) is in a deep milling operation working condition.
2. The hydraulic control system according to claim 1, wherein the plunger pump (8) comprises a main pump (7) and an oil supplementing pump (20), an oil inlet of the oil supplementing pump (20) is communicated with the oil tank (1), an oil outlet of the oil supplementing pump (20) is communicated with the main pump (7) through a proportional valve (9) for stepless speed regulation, and an oil outlet of the oil supplementing pump (20) is communicated with the first two-position three-way reversing valve (12) and the second two-position three-way reversing valve (13);
the low-pressure side and the high-pressure side of the main pump (7) are both communicated with the low-speed motor (16).
3. The hydraulic control system according to claim 2, wherein an oil port at one end of the first oil-supplementing overflow valve (5) and an oil port at one end of the second oil-supplementing overflow valve (6) are both communicated with the oil-supplementing pump (20), an oil port at the other end of the first oil-supplementing overflow valve (5) is connected to a low-pressure side of the main pump (7), and an oil port at the other end of the second oil-supplementing overflow valve (6) is connected to a high-pressure side of the main pump (7), so that high-pressure side overflow and low-pressure side oil supplementation of a circulating oil path between the main pump (7) and the low-speed motor (16) are realized.
4. The hydraulic control system according to claim 3, characterized by further comprising an oil charge pump relief valve (4) for limiting a highest pressure of the oil charge pump (20);
oil supply pump overflow valve (4) set up oil supply pump (20) with between proportional valve (9), oil supply pump overflow valve (4) set up oil supply pump (20) with between first two tee bend switching-over valves (12) and the two tee bend switching-over valves of second (13), oil supply pump overflow valve (4) set up oil supply pump (20) with between first oil supply overflow valve (5) and the second oil supply overflow valve (6).
5. The hydraulic control system according to claim 2, characterized in that the shut-off and spill valve (3) is connected between the main pump (7) and the low-speed motor (16) to achieve an overload and overpressure protection of the circulating oil circuit between the main pump (7) and the low-speed motor (16).
6. The hydraulic control system according to claim 2, further comprising a first pressure gauge (10) connected to the proportional valve (9) for observing the oil supply pressure of the main pump (7), a second pressure gauge (14) connected to a high-pressure side of the main pump (7) for observing the high-pressure of the main pump (7), and a third pressure gauge (19) connected to a low-pressure side of the main pump (7) for observing the low-pressure of the main pump (7).
7. The hydraulic control system of claim 2, further comprising a flushing valve (15) for flushing oil on the low pressure side of the main pump (7) into the tank, the flushing valve (15) being in communication with the tank and the low pressure side and the high pressure side of the main pump (7), respectively.
8. The hydraulic control system according to claim 1, wherein an oil suction filter (2) is disposed between an oil inlet of an oil supply pump (20) in the plunger pump (8) and the oil tank (1), and an oil return port of the low-speed motor (16) and an oil return port of the control valve group (11) are both communicated with the oil tank (1) through an oil return filter (21).
9. A milling machine, characterized in that it comprises a hydraulic control system according to any one of claims 1 to 8.
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| CN115234543A (en) * | 2022-07-15 | 2022-10-25 | 烟台杰瑞石油装备技术有限公司 | Hydraulic monitoring system |
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| CN113803330B (en) | 2023-11-21 |
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