CN104033450A - Hydraulic control unloading valve - Google Patents
Hydraulic control unloading valve Download PDFInfo
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- CN104033450A CN104033450A CN201410230223.7A CN201410230223A CN104033450A CN 104033450 A CN104033450 A CN 104033450A CN 201410230223 A CN201410230223 A CN 201410230223A CN 104033450 A CN104033450 A CN 104033450A
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Abstract
The invention relates to a hydraulic control unloading valve. The hydraulic control unloading valve solves the problem that energy losses are caused due to the fact that an existing unloading valve can only achieve high-pressure unloading. A one-way valve which conducts one-way connection in the direction of an oil outlet PV is arranged between an oil inlet P and the oil outlet PV in the hydraulic control unloading valve. The hydraulic control end of a safety valve is connected between the one-way valve and the oil outlet PV. An outlet of the safety valve is communicated with an overflowing opening T. An inlet of the safety valve is communicated with one outlet of a two-position three-way valve, and the other outlet of the two-position three-way valve is communicated with the overflowing opening T. The oil inlet P is respectively communicated with the inlet of the two-position three-way valve and the hydraulic control end of an overflowing valve through an orifice. An oil inlet of the overflowing valve is communicated with the oil inlet P. An oil outlet of the overflowing valve is communicated with the overflowing opening T. The hydraulic control end of the two-position three-way valve is communicated with an LS opening of the hydraulic control end. The hydraulic control unloading valve has no overflowing losses or neutral-position opening losses or high-pressure unloading losses, and is low in energy consumption and cooling power, and the service life of liquid oil is long.
Description
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Technical field
The present invention relates to a kind of hydraulic element, relate in particular to a kind of hydraulic control unloader valve.
Background technique
The hydraulic system that adopts at present unloading valve, its unloading valve is generally high-pressure unloading valve, and in the time that hydraulic system pressure reaches the pressure of unloading valve setting, hydraulic system realizes high pressure unloading, has very large high pressure unloading loss; Simultaneously, hydraulic system is under Part load, and final controlling element does not move or carries out fine motion work, but the hydraulic oil that oil pump is confessed is except offering final controlling element moves, remaining flow flows back to fuel tank by main valve, produces greatly middle bit-loss and restriction loss; Thus, cause hydraulic system to produce very large heat, energy consumption is large.
Summary of the invention
The object of the invention is to can only realize high pressure unloading and cause the shortcoming of energy loss and a kind of hydraulic control unloader valve and a kind of loader hydraulic system with this hydraulic control unloader valve that can realize Low-pressure load discharge is provided for existing unloading valve.
Technological scheme of the present invention is achieved in that a kind of hydraulic control unloader valve of structure, include oil inlet P, oil outlet PV, flow-off T, hydraulic control end LS mouth, safety valve, two-position three-way valve, relief valve and throttle orifice, between oil inlet P and oil outlet PV, be provided with to the first one-way valve of oil outlet PV direction one-way conduction, the hydraulic control end of safety valve is connected between the first one-way valve and oil outlet PV, the outlet of safety valve is communicated with flow-off T, the entrance of safety valve is communicated with an outlet of two-position three-way valve, another outlet of two-position three-way valve is communicated with flow-off T, oil inlet P is communicated with the entrance of two-position three-way valve and the hydraulic control end of relief valve respectively through throttle orifice, the filler opening of relief valve is communicated with oil inlet P, the oil outlet of relief valve is communicated with flow-off T, the hydraulic control end of two-position three-way valve is communicated with hydraulic control end LS mouth, in the time that the pressure of hydraulic control end LS mouth is greater than the spring setting pressure of two-position three-way valve, two-bit triplet valve inlet is communicated with the entrance of safety valve through an outlet of two-position three-way valve, in the time that the pressure of hydraulic control end LS mouth is less than the spring setting pressure of two-position three-way valve, two-bit triplet valve inlet is communicated with flow-off T through another outlet of two-position three-way valve.In the present invention, in the time that the pressure of hydraulic control end LS mouth is greater than the spring setting pressure of two-position three-way valve and the pressure of oil outlet PV and is greater than the cracking pressure of safety valve or in the time that the pressure of hydraulic control end LS mouth is less than the spring setting pressure of two-position three-way valve, relief valve is opened, also be that hydraulic control unloader valve is opened, the pressure oil of its oil inlet P directly flows back to fuel tank through relief valve, overflow T mouth, realize Low-pressure load discharge, the energy loss of avoiding high pressure unloading to cause.In the time that the pressure of hydraulic control end LS mouth is greater than the spring setting pressure of two-position three-way valve and the pressure of oil outlet PV and is less than the cracking pressure of safety valve, two-bit triplet valve inlet is communicated with the entrance of safety valve through an outlet of two-position three-way valve, but safety is not opened, the pressure of relief valve hydraulic control end equals the pressure of relief valve filler opening, relief valve cuts out, also be hydraulic control unloader valve also in closed condition, now the pressure oil of hydraulic control unloader valve oil inlet P flows out external fuel feeding through the first one-way valve from oil outlet PV.
In above-mentioned hydraulic control unloader valve, between the hydraulic control end of safety valve and oil outlet PV, be provided with second section discharge orifice, second section discharge orifice can cushion the pressure of oil outlet PV.
The present invention is for realizing its goal of the invention, and a kind of technological scheme also providing is: construct a kind of loader hydraulic system, comprise metering pump, distributing valve, pilot valve, operating cylinder, fuel tank and above-mentioned hydraulic control unloader valve; The operating cylinder that pilot valve is connected with distributing valve and is connected with distributing valve through distributing valve control; The oil inlet P of hydraulic control unloader valve and the oil outlet of metering pump are communicated with, the P mouth connection of oil outlet PV and distributing valve, hydraulic control end LS mouth and pilot valve guide feed back LS mouth and be connected and obtain pilot valve guide oil pressure signal, and flow-off T is communicated with fuel tank.In loader hydraulic system of the present invention, when attonity on pilot valve, or occur when mild action, pilot valve guide feeds back the pressure of LS mouth lower than the spring setting pressure of two-position three-way valve in hydraulic control unloader valve, two-bit triplet valve inlet is communicated with flow-off T through another outlet of two-position three-way valve, due to the damping function of throttle orifice, the pressure of relief valve hydraulic control end is lower than the pressure at filler opening place, relief valve is opened, the oil of metering pump output is through oil inlet P, relief valve, overflow T mouth directly flows back to fuel tank, realize Low-pressure load discharge, avoid distributing valve to open the energy loss that meta causes.And in the time of the operation of operating cylinder overburdening, the pressure at oil outlet PV place is higher than the spring setting pressure of safety valve, safety valve is opened, if now pilot valve also has big-movement, the pressure that pilot valve guide feeds back LS mouth is also the spring setting pressure that the pressure of hydraulic control end LS mouth is greater than two-position three-way valve, two-position three-way valve is in right position, its entrance is through an outlet of two-position three-way valve, safety valve is communicated with flow-off T, the pressure of relief valve hydraulic control end is lower than the pressure at relief valve filler opening place, relief valve is opened, the oil of metering pump output is through oil inlet P, relief valve, overflow T mouth directly flows back to fuel tank, realize Low-pressure load discharge, the energy loss of high pressure unloading while avoiding transshipping.
In above-mentioned loader hydraulic system, also comprise steering system, the P mouth of distributing valve is communicated with the oil circuit of exporting with the oil outlet PV of hydraulic control unloader valve and forms interflow oil feeding line with the working oil path of steering system.
In above-mentioned loader hydraulic system, also comprise the second one-way valve, pilot control, guide oil source valve, described pilot control is communicated with the P mouth of pilot valve through guide oil source valve, and the entrance of the second one-way valve communicates with the large chamber of boom cylinder, and the outlet of the second one-way valve communicates with guide oil source valve.
Hydraulic control unloader valve of the present invention and loader hydraulic system make when hydraulic system pressure higher than unloading valve in when the pressure of safety valve setting, hydraulic system realizes Low-pressure load discharge, has eliminated high pressure spill losses; Make when hydraulic system is under Part load simultaneously, when final controlling element (pilot valve) does not move or carries out fine motion and do, the oil that certain or certain several oil pumps are confessed flows back to fuel tank with minimum back pressure, flow back to fuel tank or do not participate in final controlling element work without main valve, reduce middle bit-loss and restriction loss, finally made hydraulic system more energy-conservation.
The present invention compared with prior art, advantage of the present invention:
(1) realize Low-pressure load discharge, there is no high pressure spill losses
(2) realize final controlling element attonity and while not moving, that reduces system opens middle bit-loss and restriction loss.
Brief description of the drawings
Fig. 1 is the schematic diagram of hydraulic control unloader valve of the present invention;
Fig. 2 is that loader of the present invention is determined hydraulic system hydraulic schematic diagram.。
Component title and sequence number in figure:
Fuel tank 1, metering pump 2, unloading valve 4, distributing valve 5, rotary ink tank 6, boom cylinder 7, guide oil source valve 8, pilot valve 9, the second one-way valve 10, safety valve 41, second section discharge orifice 42, the first one-way valve 43, relief valve 44, throttle orifice 45, two-position three-way valve 46.
Embodiment
Below in conjunction with brief description of the drawings specific embodiments.
As shown in Figure 1, hydraulic control unloader valve 4 comprises and is provided with oil inlet P, oil outlet PV, flow-off T, safety valve 41, two-position three-way valve 46, relief valve 44 and throttle orifice 45, in oil inlet P to being provided with between oil outlet PV to the first one-way valve 43 of oil outlet PV direction one-way conduction, the hydraulic control end of safety valve 41 is connected between this first one-way valve 43 and oil outlet PV, between the hydraulic control end of safety valve 41 and oil outlet PV, is provided with second section discharge orifice 42.The outlet of safety valve 41 is communicated with flow-off T, the entrance of safety valve 41 is communicated with an outlet of two-position three-way valve 46, another outlet of two-position three-way valve 46 is communicated with flow-off T, oil inlet P is communicated with the entrance of two-position three-way valve 46 and the hydraulic control end of relief valve 44 respectively through throttle orifice 45, the filler opening of relief valve 44 is communicated with oil inlet P, the oil outlet of relief valve 44 is communicated with flow-off T, and the hydraulic control end of two-position three-way valve 46 is as the hydraulic control end LS mouth of hydraulic control unloader valve 4.In the time that the pressure of hydraulic control end LS mouth is greater than the spring setting pressure of two-position three-way valve 46, two-position three-way valve 46 entrances are communicated with the entrance of safety valve 41 through an outlet of two-position three-way valve 46; In the time that the pressure of hydraulic control end LS mouth is less than the spring setting pressure of two-position three-way valve 46, two-position three-way valve 46 entrances are communicated with flow-off T through another outlet of two-position three-way valve 46.
Fig. 2 shows a kind of loader hydraulic system, and it comprises metering pump 2, distributing valve 5, pilot valve 9, operating cylinder (rotary ink tank 6 and boom cylinder 7), fuel tank 1 and above-mentioned hydraulic control unloader valve 4; Pilot valve 9 is communicated with to realize with corresponding a1, a2, b1, b2 hydraulic fluid port on distributing valve 5 respectively by the a1 on it, a2, b1, b2 hydraulic fluid port and is communicated with distributing valve 5, and controls by distributing valve 5 rotary ink tank 6 and the boom cylinder 7 that are connected with distributing valve 5; The oil inlet P of hydraulic control unloader valve 4 is communicated with the oil outlet of metering pump 2, oil outlet PV is communicated with the P mouth of distributing valve 5, hydraulic control end LS mouth feeds back LS mouth with the guide of pilot valve 9 and is connected the guide oil pressure signal that obtains pilot valve 9, and flow-off T is communicated with fuel tank 1.The P mouth of distributing valve 5 is also for being communicated with hydraulic circuit in loader hydraulic system steering system the pressure oil obtaining, and realizes and the interflow of steering hydraulic oil circuit, and pilot valve 9 is communicated with pilot control and is obtained pilot control pressure oil by guide oil source valve 8.
In loader hydraulic system of the present invention, when attonity on pilot valve 9, or occur when mild action, the guide of pilot valve 9 feeds back the pressure of LS mouth lower than the spring setting pressure of two-position three-way valve 46 in hydraulic control unloader valve 4, the entrance of two-position three-way valve 46 is communicated with flow-off T through an outlet of two-position three-way valve 46, due to the damping function of throttle orifice 45, the pressure of the hydraulic control end of relief valve 44 is lower than the pressure at its filler opening place, relief valve 44 is opened, it is also rotary ink tank 6 that metering pump 2 does not participate in operating cylinder, the fuel feeding of boom cylinder 7, the oil that metering pump 2 is exported is through oil inlet P, relief valve 44, overflow T mouth directly flows back to fuel tank 1, realize Low-pressure load discharge, avoid distributing valve 5 to open the energy loss that meta causes.If now pilot valve 9 has mild action, pass through distributing valve 5 to operation oil cylinder fuel feeding by the oil pump feed in steering system, the fine motion control of response pilot valve 9.
In the time of the operation of operating cylinder overburdening, the pressure at oil outlet PV place is higher than the spring setting pressure of safety valve, safety valve 41 is opened, if now pilot valve 9 also has big-movement, the pressure that the guide of pilot valve 9 feeds back LS mouth is also the spring setting pressure that the pressure of hydraulic control end LS mouth is greater than two-position three-way valve 46, two-position three-way valve 46 is in right position, its entrance is through an outlet of two-position three-way valve 46, safety valve 41 is communicated with flow-off T, the pressure of the hydraulic control end of relief valve 44 is lower than the pressure at relief valve filler opening place, relief valve 44 is opened, the oil that metering pump 2 is exported is through oil inlet P, relief valve 44, overflow T mouth directly flows back to fuel tank, realize Low-pressure load discharge, the energy loss of high pressure unloading while avoiding transshipping.
In the time of operating cylinder normal operation, the pressure at oil outlet PV place is lower than the spring setting pressure of safety valve 41, safety valve 41 cuts out, if now pilot valve 9 also has big-movement, the pressure that the guide of pilot valve 9 feeds back LS mouth is also the spring setting pressure that the pressure of hydraulic control end LS mouth is greater than two-position three-way valve 46, two-position three-way valve 46 is in right position, its entrance is communicated with the entrance of safety valve 41 through an outlet of two-position three-way valve, but because safety valve 41 is not opened, so the entrance of two-position three-way valve 46 also with relief valve 44 hydraulic control ends and not conducting of flow-off T, its pressure equals the pressure at relief valve 44 filler opening places, relief valve 44 cuts out, the oil that metering pump 2 is exported is through oil inlet P, the first one-way valve 43, oil outlet PV is to the P mouth of distributing valve, realize the interflow of metering pump and steering system fuel feeding, together to operating cylinder fuel feeding.
Claims (5)
1. a hydraulic control unloader valve, it is characterized in that including oil inlet P, oil outlet PV, flow-off T, hydraulic control end LS mouth, safety valve (41), two-position three-way valve (46), relief valve (44) and throttle orifice (45), between oil inlet P and oil outlet PV, be provided with to first one-way valve (43) of oil outlet PV direction one-way conduction, the hydraulic control end of described safety valve (41) is connected between one-way valve and oil outlet PV, the outlet of described safety valve (41) is communicated with flow-off T, the entrance of safety valve (41) is communicated with an outlet of two-position three-way valve (46), another outlet of two-position three-way valve (46) is communicated with flow-off T, oil inlet P is communicated with the entrance of two-position three-way valve (46) and the hydraulic control end of relief valve (44) respectively through throttle orifice (45), the filler opening of relief valve (44) is communicated with oil inlet P, the oil outlet of relief valve (44) is communicated with flow-off T, the hydraulic control end of two-position three-way valve (46) is communicated with hydraulic control end LS mouth, in the time that the pressure of hydraulic control end LS mouth is greater than the spring setting pressure of two-position three-way valve (46), two-position three-way valve (46) entrance is communicated with the entrance of safety valve (41) through an outlet of two-position three-way valve (46), in the time that the pressure of hydraulic control end LS mouth is less than the spring setting pressure of two-position three-way valve (46), two-position three-way valve (46) entrance is communicated with flow-off T through another outlet of two-position three-way valve (46).
2. hydraulic control unloader valve according to claim 1, is characterized in that being provided with second section discharge orifice (42) between the hydraulic control end of described safety valve (41) and oil outlet PV.
3. a loader hydraulic system, comprises metering pump (2), distributing valve (5), pilot valve (9), operating cylinder, fuel tank (1); Described pilot valve (9) is connected with distributing valve (5) and controls the operating cylinder (6,7) being connected with distributing valve (5) through distributing valve (5); Characterized by further comprising the hydraulic control unloader valve (4) in claim 1 or 2, the oil outlet of the oil inlet P of hydraulic control unloader valve (4) and metering pump (2) is communicated with, the P mouth connection of oil outlet PV and distributing valve (5), hydraulic control end LS mouth and pilot valve (9) guide feed back LS mouth and be connected and obtain pilot valve (9) guide oil pressure signal, and flow-off T is communicated with fuel tank (1).
4. loader hydraulic system according to claim 3, characterized by further comprising steering system, and the P mouth of described distributing valve (5) is communicated with the oil circuit of exporting with the oil outlet PV of hydraulic control unloader valve and forms interflow oil feeding line with the working oil path of steering system.
5. loader hydraulic system according to claim 4, characterized by further comprising the second one-way valve (10), pilot control, guide oil source valve (8), described pilot control is communicated with the P mouth of pilot valve (9) through guide oil source valve (8); The entrance of described the second one-way valve (10) communicates with the large chamber of boom cylinder (7), and the outlet of the second one-way valve (10) communicates with guide oil source valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410230223.7A CN104033450B (en) | 2014-05-28 | 2014-05-28 | Hydraulic control unloader valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410230223.7A CN104033450B (en) | 2014-05-28 | 2014-05-28 | Hydraulic control unloader valve |
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| Publication Number | Publication Date |
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| CN104033450A true CN104033450A (en) | 2014-09-10 |
| CN104033450B CN104033450B (en) | 2016-05-25 |
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| CN201410230223.7A Active CN104033450B (en) | 2014-05-28 | 2014-05-28 | Hydraulic control unloader valve |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001019391A (en) * | 1999-07-06 | 2001-01-23 | Toyota Autom Loom Works Ltd | Tilt controller for forklift |
| US20050198949A1 (en) * | 2004-03-13 | 2005-09-15 | Marcus Bitter | Hydraulic arrangement |
| CN102159491A (en) * | 2008-10-09 | 2011-08-17 | 卡斯卡特公司 | Equalized hydraulic clamp force control apparatus |
| CN202148156U (en) * | 2011-07-28 | 2012-02-22 | 长沙中联重工科技发展股份有限公司 | Hydraulic spring type rear tipping prevention device of luffing tower crane |
| JP2013032814A (en) * | 2011-08-02 | 2013-02-14 | Kubota Corp | Unload device of working machine |
| CN203114763U (en) * | 2012-12-27 | 2013-08-07 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Traveling reversing valve of open-type hydraulic transmission system in telescopic arm forklift truck |
-
2014
- 2014-05-28 CN CN201410230223.7A patent/CN104033450B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001019391A (en) * | 1999-07-06 | 2001-01-23 | Toyota Autom Loom Works Ltd | Tilt controller for forklift |
| US20050198949A1 (en) * | 2004-03-13 | 2005-09-15 | Marcus Bitter | Hydraulic arrangement |
| CN102159491A (en) * | 2008-10-09 | 2011-08-17 | 卡斯卡特公司 | Equalized hydraulic clamp force control apparatus |
| CN202148156U (en) * | 2011-07-28 | 2012-02-22 | 长沙中联重工科技发展股份有限公司 | Hydraulic spring type rear tipping prevention device of luffing tower crane |
| JP2013032814A (en) * | 2011-08-02 | 2013-02-14 | Kubota Corp | Unload device of working machine |
| CN203114763U (en) * | 2012-12-27 | 2013-08-07 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Traveling reversing valve of open-type hydraulic transmission system in telescopic arm forklift truck |
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| CN104033450B (en) | 2016-05-25 |
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