CN103835215A - Hydraulic system for tail door mechanism of road milling machine - Google Patents
Hydraulic system for tail door mechanism of road milling machine Download PDFInfo
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- CN103835215A CN103835215A CN201210496419.1A CN201210496419A CN103835215A CN 103835215 A CN103835215 A CN 103835215A CN 201210496419 A CN201210496419 A CN 201210496419A CN 103835215 A CN103835215 A CN 103835215A
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- solenoid operated
- directional valve
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Abstract
The invention discloses a hydraulic system for a tail door mechanism of a road milling machine. The hydraulic system comprises a hydraulic pump and a hydraulic cylinder, wherein a rod cavity of the hydraulic cylinder and the C port of an electromagnetic reversing valve I are communicated with the G port of an electromagnetic reversing valve II; a rodless cavity of the hydraulic cylinder and the D port of the electromagnetic reversing valve I are communicated with the H port of the electromagnetic reversing valve II; the A port of the electromagnetic valve I is respectively communicated with the J port and the K port of an electromagnetic reversing valve III; the B port of the electromagnetic reversing valve I, the E port and the F port of the electromagnetic reversing valve II are all communicated with an oil return tank; the I port of the electromagnetic reversing valve III is communicated with the outlet of the hydraulic pump; an oil inlet check valve, an energy accumulator and a pressure sensor are arranged at a pipeline between the A port of the electromagnetic reversing valve I and the J port of the electromagnetic reversing valve III in sequence. The hydraulic system for the tail door mechanism of the road milling machine is characterized in that the automation degree is high, the labor intensity of an operator is reduced, the driving power of the hydraulic cylinder can be self-adjusted, the control accuracy is high and the control process and the running process are very smooth and stable.
Description
Technical field
The invention belongs to technical field of engineering machinery, relate to a kind of hydraulic system, be specifically related to a kind of end gate of pavement milling and planning machine mechanism hydraulic system.
Background technology
At present, along with China's expanding economy, the enhancing of overall national strength, maximize in small towns urbanization, small and medium-sized cities, the trend in garden, big and medium-sized cities is day by day obvious, and the reconstruction and extension project of urban road is also more and more; Nowadays a lot of provinces, China's Mainland are such as the highway construction on the ground such as Zhejiang, Jiangsu, Henan is all transitioned into stage of " supporting " from " building "; " producing again " of speedway is also more general, in the construction of speedway, for meeting the demand of ecological construction, tending to that milling pitch is out dropped into processing again uses, pavement milling machine is one of requisite equipment of road machine maintenance, but end gate of pavement milling and planning machine tail-gate exists in the time that scraper is advanced: the problem such as the milling material rate of recovery is low, the groove out-of-flatness of milling road, scraper resistance are bigger than normal.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, a kind of end gate of pavement milling and planning machine mechanism hydraulic system is provided, it is reasonable in design, automaticity is high, reduces operator labour intensity, can self adaptation regulator solution cylinder pressure driving force, control accuracy is high, be provided with accumulator, can reduce the degree of fluctuation of hydraulic system oil pressure, control procedure and running are very steady.
For achieving the above object, the technical solution used in the present invention is: a kind of end gate of pavement milling and planning machine mechanism hydraulic system, comprise the hydraulic pump of pressure oil output and for driving the hydraulic cylinder of tail-gate mechanism, it is characterized in that: described hydraulic cylinder rod chamber, the C mouth of solenoid operated directional valve one and the G mouth of solenoid operated directional valve two are communicated with, described hydraulic cylinder rodless cavity, the D mouth of solenoid operated directional valve one and the H mouth of solenoid operated directional valve two are communicated with, the A mouth of described solenoid operated directional valve one is communicated with J mouth and the K mouth of solenoid operated directional valve three respectively, the B mouth of described solenoid operated directional valve one, E mouth and the F mouth of solenoid operated directional valve two are all communicated with oil sump tank, the I mouth of described solenoid operated directional valve three is communicated with hydraulic pump outlet, on pipeline between the A mouth of described solenoid operated directional valve one and the J mouth of described solenoid operated directional valve three, be disposed with in line check valve, accumulator and pressure sensor, described hydraulic pump exit is provided with electromagnetic relief valve.
Above-mentioned end gate of pavement milling and planning machine mechanism hydraulic system, is characterized in that: described solenoid operated directional valve one is 3-position 4-way solenoid operated directional valve, and described solenoid operated directional valve two is two-bit triplet solenoid operated directional valve, and described solenoid operated directional valve three is 2/2-way solenoid operated directional valve.
Above-mentioned end gate of pavement milling and planning machine mechanism hydraulic system, is characterized in that: on the B mouth of described solenoid operated directional valve one, the E mouth of solenoid operated directional valve two and the F mouth pipeline all and between oil sump tank, be provided with oil filter and be communicated with.
The present invention compared with prior art has the following advantages:
(1) this end gate of pavement milling and planning machine mechanism is very reasonable by design of Hydraulic System, and system can complete voluntarily tail-gate ground pressure and regulate, and automaticity is very high, greatly reduces operator's labour intensity.
(2) this end gate of pavement milling and planning machine mechanism can self adaptation regulator solution cylinder pressure driving force by hydraulic system electrical control system, makes the ground pressure of tail-gate constant, and control accuracy is high.
(3) this end gate of pavement milling and planning machine mechanism is provided with accumulator by hydraulic system, can reduce the degree of fluctuation of hydraulic system oil pressure, and control procedure and running are very steady.
Below by drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is hydraulic control principle schematic of the present invention.
Description of reference numerals:
1-hydraulic pump; 2-hydraulic cylinder; 3-solenoid operated directional valve one;
4-pressure sensor; 5-solenoid operated directional valve two; 6-in line check valve;
7-solenoid operated directional valve three; 8-electromagnetic relief valve; 9-oil filter;
10-accumulator.
The specific embodiment
A kind of end gate of pavement milling and planning machine mechanism hydraulic system as shown in Figure 1, comprise the hydraulic pump 1 of pressure oil output and for driving the hydraulic cylinder 2 of tail-gate mechanism, described hydraulic cylinder 2 rod chambers, the C mouth of solenoid operated directional valve 1 and the G mouth of solenoid operated directional valve 25 are communicated with, described hydraulic cylinder 2 rodless cavities, the D mouth of solenoid operated directional valve 1 and the H mouth of solenoid operated directional valve 25 are communicated with, the A mouth of described solenoid operated directional valve 1 is communicated with J mouth and the K mouth of solenoid operated directional valve 37 respectively, the B mouth of described solenoid operated directional valve 1, E mouth and the F mouth of solenoid operated directional valve 25 are all communicated with oil sump tank, the I mouth of described solenoid operated directional valve 37 is communicated with hydraulic pump 1 outlet, on pipeline between the A mouth of described solenoid operated directional valve 1 and the J mouth of described solenoid operated directional valve 37, be disposed with in line check valve 6, accumulator 10 and pressure sensor 4, described hydraulic pump 1 exit is provided with electromagnetic relief valve 8.
As shown in Figure 1, described solenoid operated directional valve 1 is 3-position 4-way solenoid operated directional valve, and described solenoid operated directional valve 25 is two-bit triplet solenoid operated directional valve, and described solenoid operated directional valve 37 is 2/2-way solenoid operated directional valve.
As shown in Figure 1, be provided with oil filter 9 and be communicated with on the B mouth of described solenoid operated directional valve 1, the E mouth of solenoid operated directional valve 25 and the F mouth pipeline all and between oil sump tank, oil filter 9 is the impurity in filtration system hydraulic oil effectively.
End gate of pavement milling and planning machine of the present invention mechanism by the course of work of hydraulic system is: when pavement milling machine starts operation, and 25 left connecting systems of solenoid operated directional valve, the rod chamber of hydraulic cylinder 2 and rodless cavity all take back fuel tank, and tail-gate drops to road surface under the effect of deadweight.The left position of controller control solenoid operated directional valve 1, the right position of solenoid operated directional valve 25 and 37 left connecting systems of solenoid operated directional valve, pressure sensor 4 starts to monitor the pressure of hydraulic cylinder 2 rod chambers, and by automatic control circuit, the signal of its collection is compared to processing.Because the pressure that just starts tail-gate deadweight generation is greater than the ground pressure that tail-gate is set, the rod chamber pressure of the hydraulic cylinder 2 that pressure sensor 4 records is less than the minimum value of setting, electromagnetic relief valve 8 is not worked, hydraulic pump 1 is constantly to hydraulic cylinder 2 rod chamber fuel feeding, until the pressure of hydraulic cylinder 2 rod chambers is while reaching the maximum value of setting, electromagnetic relief valve 8 off-loads, cut off oil sources, now accumulator 10 starts to system supplementary pressure oil in the time that pressure reduces, and the pressure in hydraulic cylinder 2 rod chambers is remained in default pressure limit.
In the time that pavement milling machine finishes operation or occur that in operation process special circumstances need to largely be adjusted tail-gate height, the right position of controller control solenoid operated directional valve 37 and 25 right connecting systems of solenoid operated directional valve, cut off the oil circuit that pressure sensor 4 and accumulator 10 are installed.Now, if the left position connecting system of solenoid operated directional valve 1, the pressure oil that hydraulic pump 1 is exported flows directly into the rod chamber of hydraulic cylinder 2, and tail-gate raises fast; If the right position connecting system of solenoid operated directional valve 1, the pressure oil that hydraulic pump 1 is exported flows directly into the rodless cavity of hydraulic cylinder 2, tail-gate fast-descending.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure transformation of above embodiment being done according to the technology of the present invention essence, all still belongs in the protection domain of technical solution of the present invention.
Claims (3)
1. an end gate of pavement milling and planning machine mechanism hydraulic system, comprise the hydraulic pump (1) of pressure oil output and for driving the hydraulic cylinder (2) of tail-gate mechanism, it is characterized in that: described hydraulic cylinder (2) rod chamber, the G mouth of the C mouth of solenoid operated directional valve one (3) and solenoid operated directional valve two (5) is communicated with, described hydraulic cylinder (2) rodless cavity, the H mouth of the D mouth of solenoid operated directional valve one (3) and solenoid operated directional valve two (5) is communicated with, the A mouth of described solenoid operated directional valve one (3) is communicated with J mouth and the K mouth of solenoid operated directional valve three (7) respectively, the B mouth of described solenoid operated directional valve one (3), E mouth and the F mouth of solenoid operated directional valve two (5) are all communicated with oil sump tank, the I mouth of described solenoid operated directional valve three (7) is communicated with hydraulic pump (1) outlet, on pipeline between the J mouth of the A mouth of described solenoid operated directional valve one (3) and described solenoid operated directional valve three (7), be disposed with in line check valve (6), accumulator (10) and pressure sensor (4), described hydraulic pump (1) exit is provided with electromagnetic relief valve (8).
2. according to end gate of pavement milling and planning machine claimed in claim 1 mechanism hydraulic system, it is characterized in that: described solenoid operated directional valve one (3) is 3-position 4-way solenoid operated directional valve, described solenoid operated directional valve two (5) is two-bit triplet solenoid operated directional valve, and described solenoid operated directional valve three (7) is 2/2-way solenoid operated directional valve.
3. according to end gate of pavement milling and planning machine claimed in claim 1 mechanism hydraulic system, it is characterized in that: on the B mouth of described solenoid operated directional valve one (3), the E mouth of solenoid operated directional valve two (5) and the F mouth pipeline all and between oil sump tank, be provided with oil filter (9) and be communicated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210496419.1A CN103835215A (en) | 2012-11-27 | 2012-11-27 | Hydraulic system for tail door mechanism of road milling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210496419.1A CN103835215A (en) | 2012-11-27 | 2012-11-27 | Hydraulic system for tail door mechanism of road milling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103835215A true CN103835215A (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210496419.1A Pending CN103835215A (en) | 2012-11-27 | 2012-11-27 | Hydraulic system for tail door mechanism of road milling machine |
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| CN (1) | CN103835215A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120326A (en) * | 2017-07-10 | 2017-09-01 | 南京英达公路养护车制造有限公司 | A kind of levelling oil cylinder hydraulic control system of loading head |
-
2012
- 2012-11-27 CN CN201210496419.1A patent/CN103835215A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120326A (en) * | 2017-07-10 | 2017-09-01 | 南京英达公路养护车制造有限公司 | A kind of levelling oil cylinder hydraulic control system of loading head |
| CN107120326B (en) * | 2017-07-10 | 2018-06-15 | 南京英达公路养护车制造有限公司 | A kind of levelling oil cylinder hydraulic control system of loading head |
| WO2018137723A1 (en) * | 2017-07-10 | 2018-08-02 | 南京英达公路养护车制造有限公司 | Material collector leveling cylinder hydraulic control system |
| US10590627B2 (en) | 2017-07-10 | 2020-03-17 | Nanjing Freetech Road Maintenance Vehicle Manufacturing Corporation | Hydraulic control system of leveling oil cylinder of loading head |
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Application publication date: 20140604 |