CN103466482B - A kind of hoist and hoisting hydraulic system thereof - Google Patents
A kind of hoist and hoisting hydraulic system thereof Download PDFInfo
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- CN103466482B CN103466482B CN201310433885.XA CN201310433885A CN103466482B CN 103466482 B CN103466482 B CN 103466482B CN 201310433885 A CN201310433885 A CN 201310433885A CN 103466482 B CN103466482 B CN 103466482B
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Abstract
The invention discloses a kind of hoisting hydraulic system for hoist, this hoisting hydraulic system comprises the feed circuit of BVD equilibrium valve and the motor repairing for supporting BVD equilibrium valve, this feed circuit comprises the first feed circuit further, first oil pump of the first feed circuit detects hydraulic fluid port with the oil pressure of BVD equilibrium valve and is communicated with, and the first oil pump and described oil pressure detect between hydraulic fluid port oil circuit is provided with the first one-way valve, the first one-way valve detects hydraulic fluid port conducting from the first oil pump to oil pressure.Because the first feed circuit and fuel tank do not exist any type of connected relation, the low pressure oil in the first feed circuit can not run off, thus achieve motor continuous, quick, stablize repairing; In addition, without the need to arranging back pressure valve in this feed circuit, avoiding the impact arranged system pressure of back pressure valve, improve the service behaviour of system.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of hoisting hydraulic system of hoist.The invention still further relates to a kind of hoist comprising above-mentioned hoisting hydraulic system.
Background technique
Along with the fast development of China's economic construction, market increases day by day for the demand of the especially various hoist of engineering machinery, and people also improve constantly for the performance requirement of hoist.Hoisting hydraulic system, for realizing hoisting and whereabouts of load, is the important component part of crane hydraulic system, its good and bad performance directly affecting hoist.
BVD equilibrium valve is the widely used a kind of flow control valve of heavy hydraulic machinery, control thought is throttling speed limit, its two large function is load maintenance and speeds control, load keeps requiring equilibrium valve zero leakage, speeds control requires that equilibrium valve has good Flow characteristics, can fine motion be realized, as one of the core parts of hoisting hydraulic system, there is break and to control and equilibrium valve controls two-part function.BVD equilibrium valve adopts slide-valve structure, elevator equilibrium valve spool when hoisting and decline all commutates, and when selector valve returns meta, seals motor hyperbaric chamber by guiding valve slip surface, because guiding valve cannot realize zero leakage, once empty stall inhaled by the excessive motor that will cause of leakage rate; Therefore, need to arrange the feed circuit for motor in hoisting hydraulic system.
Please refer to Fig. 1, Fig. 1 is a kind of partial structurtes schematic diagram of typical hoisting hydraulic system.
The BVD equilibrium valve 11 used in traditional hoisting hydraulic system comprises the filler opening B and return opening A that are communicated with the working position hydraulic fluid port of main valve 12, and when main valve 12 is in working position, filler opening B is communicated with oil pump, and return opening A is communicated with fuel tank; BVD equilibrium valve 11 also comprises repairing mouth S and oil pressure detects mouth MB, MB mouth is communicated with motor 14 with relief valve 13, feed circuit 15 uses after Dual-pump flow-converging as motor repairing oil sources, it is motor 14 repairing that the low pressure oil that oil pump exports enters BVD equilibrium valve by S mouth after one-way valve, and the oil pressure that feed circuit 15 provides is lower than the cracking pressure of relief valve 13.
But, because the main valve valve rod connection Median Function that hoists is Y type, handle is A, B oral fluid force feed oil sump tank after main valve, radiator when meta, after tested working connection maximum back pressure only about about the 1.5bar that can provide, there is shunting in institute's fluid infusion force feed, part hydraulic oil is through working connection oil sump tank, poor to the repairing effect of motor, time serious, institute's fluid infusion force feed major part all returns fuel tank from working connection, the unrealized repairing of motor, cause the repairing of motor unreliable, performance inconsistency is larger.
As shown in Figure 2, in order to solve the problem, adopt at present sets up one-way valve 16 more in working connection, and hydraulic oil flows into fuel tank through one-way valve 16, is improved the back pressure of working connection, thus avoid the loss of institute's fluid infusion force feed by one-way valve.But, increase at working connection total back pressure that back pressure valve can increase again system, cause the pressure of system to increase, the acting characteristic of other executive component of influential system.
Therefore, a kind of hoisting hydraulic system is provided, the motor repairing reliable performance of its BVD equilibrium valve is stablized, and avoids it to impact other executive components because back pressure increases, the service behaviour of raising system, needs the problem of solution badly with regard to becoming those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of hoisting hydraulic system for hoist, the motor repairing reliable performance of its BVD equilibrium valve is stablized, and without the need to arranging back pressure valve, avoiding because back pressure increases and other executive components are impacted, there is good service behaviour.Another object of the present invention is to provide a kind of hoist comprising above-mentioned hoisting hydraulic system.
For solving the problems of the technologies described above, the invention provides a kind of hoisting hydraulic system of hoist, comprise the feed circuit of BVD equilibrium valve and the motor repairing for described BVD equilibrium valve, described feed circuit comprises the first feed circuit, first oil pump of described first feed circuit detects hydraulic fluid port with the oil pressure of described BVD equilibrium valve and is communicated with, and described first oil pump and described oil pressure detect between hydraulic fluid port oil circuit is provided with the first one-way valve, described first one-way valve detects hydraulic fluid port conducting from described first oil pump to described oil pressure.
Preferably, also comprise the second feed circuit, second oil pump of described second feed circuit is communicated with the return opening of described BVD equilibrium valve, and oil circuit between described second oil pump and described return opening is provided with the second one-way valve, described second one-way valve from described second oil pump to described return opening conducting.
Preferably, described first oil pump and described second oil pump are same oil pump, and described first feed circuit and described second feed circuit are relative to described oil pump parallel connection.
Preferably, described first feed circuit has two branch roads, and two branch roads detect hydraulic fluid port with oil pressure described in two of described BVD equilibrium valve respectively and are communicated with.
The present invention also provides a kind of hoist, and comprise the hoisting hydraulic system of elevator and the described elevator action of control, described hoisting hydraulic system is hoisting hydraulic system as above.
Further, telescopic arm crane is specially.
Hoisting hydraulic system provided by the present invention is used for hoist, this hoisting hydraulic system comprises the feed circuit of BVD equilibrium valve and the motor repairing for supporting BVD equilibrium valve, this feed circuit comprises the first feed circuit further, first oil pump of the first feed circuit detects hydraulic fluid port with the oil pressure of BVD equilibrium valve and is communicated with, and the first oil pump and described oil pressure detect between hydraulic fluid port oil circuit is provided with the first one-way valve, the first one-way valve detects hydraulic fluid port conducting from the first oil pump to oil pressure.
Because oil pressure detects the relief valve unlatching hydraulic fluid port side that hydraulic fluid port is arranged at BVD equilibrium valve, and be communicated with motor, then the first oil pump of the first feed circuit and oil pressure are detected hydraulic fluid port when being communicated with, the low pressure oil that first oil pump exports is far smaller than the cracking pressure of relief valve, the structure of low pressure oil no longer in BVD equilibrium valve and directly enter motor, achieves the quick repairing of motor; Meanwhile, because the first feed circuit and fuel tank do not exist any type of connected relation, the low pressure oil in the first feed circuit can not run off, thus achieve motor continuous, quick, stablize repairing; In addition, without the need to arranging back pressure valve in this feed circuit, avoiding the impact arranged system pressure of back pressure valve, improve the service behaviour of system.
In a preferred embodiment, hoisting hydraulic system provided by the present invention also comprises the second feed circuit, second oil pump of this second feed circuit is communicated with the return opening of BVD equilibrium valve, and oil circuit between the second oil pump and return opening is provided with the second one-way valve, the second one-way valve from described second oil pump to return opening conducting; When repairing, the low pressure oil that the second oil pump exports enters BVD equilibrium valve by return opening, and then enters motor and realize repairing; Like this, by the auxiliary first feed circuit repairing of the second feed circuit, improve the repairing efficiency of motor.
In another preferred embodiment, the first oil pump provided by the present invention and the second oil pump are same oil pump, the first feed circuit and the second feed circuit in parallel relative to oil pump; Like this, the first feed circuit and the second feed circuit, without the need to arranging oil pump respectively, decrease the usage quantity of oil pump, thus have saved cost of production.
Accompanying drawing explanation
Fig. 1 is a kind of partial structurtes schematic diagram of typical hoisting hydraulic system;
Fig. 2 is the partial structurtes schematic diagram of another kind of typical hoisting hydraulic system;
Fig. 3 is the structural representation of a kind of embodiment of hoisting hydraulic system provided by the present invention.
Embodiment
Core of the present invention is to provide a kind of hoisting hydraulic system for hoist, the motor repairing reliable performance of its BVD equilibrium valve is stablized, and without the need to arranging back pressure valve, avoiding because back pressure increases and other executive components are impacted, there is good service behaviour.Another core of the present invention is to provide a kind of hoist comprising above-mentioned hoisting hydraulic system.
In order to make those skilled in the art person understand technological scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 3, Fig. 3 is the structural representation of a kind of embodiment of hoisting hydraulic system provided by the present invention.
In a kind of embodiment, hoisting hydraulic system provided by the present invention is used for hoist, this hoisting hydraulic system comprises the feed circuit of BVD equilibrium valve 2 and motor 21 repairing for supporting BVD equilibrium valve 2, this BVD equilibrium valve 2 is identical with the BVD equilibrium valve 2 used in traditional hoisting hydraulic system, all comprise the filler opening B be communicated with the working position hydraulic fluid port of main valve, and return opening A, when main valve is in working position, filler opening B is communicated with oil pump, and return opening A is communicated with fuel tank; BVD equilibrium valve 2 also comprises repairing mouth S and oil pressure detects mouth MB, and MB mouth is communicated with motor 21 with relief valve; Above-mentioned feed circuit comprises the first feed circuit 31 further, first oil pump of the first feed circuit 31 detects hydraulic fluid port with the oil pressure of BVD equilibrium valve 2 and is communicated with, and the first oil pump and described oil pressure detect between hydraulic fluid port oil circuit is provided with the first one-way valve 311, first one-way valve 311 detects hydraulic fluid port conducting from the first oil pump to oil pressure.
It is pointed out that the cracking pressure detecting the relief valve that hydraulic fluid port is communicated with oil pressure is far longer than the pressure of the low pressure oil that the first oil pump provides, the low pressure oil in feed circuit can not cause the unlatching of relief valve, and this should be common practise when repairing designs.
Because oil pressure detects the relief valve unlatching hydraulic fluid port side that hydraulic fluid port is arranged at BVD equilibrium valve 2, and be communicated with motor 21, then the first oil pump of the first feed circuit 31 and oil pressure are detected hydraulic fluid port when being communicated with, the low pressure oil that first oil pump exports is far smaller than the cracking pressure of relief valve, the structure of low pressure oil no longer in BVD equilibrium valve 2 and directly enter motor 21, achieves the quick repairing of motor 21; Meanwhile, because the first feed circuit 31 and fuel tank do not exist any type of connected relation, the low pressure oil in the first feed circuit 31 can not run off, thus achieve motor 21 continuous, quick, stablize repairing; In addition, without the need to arranging back pressure valve in this feed circuit, avoiding the impact arranged system pressure of back pressure valve, improve the service behaviour of system.
Hoisting hydraulic system provided by the present invention also comprises the second feed circuit 32, second oil pump of this second feed circuit 32 is communicated with the return opening of BVD equilibrium valve 2, and oil circuit between the second oil pump and return opening is provided with the second one-way valve 321, second one-way valve 321 from described second oil pump to return opening conducting; When repairing, the low pressure oil that the second oil pump exports enters BVD equilibrium valve 2 by return opening, and then enters motor 21 and realize repairing; Like this, by auxiliary first feed circuit 31 repairing of the second feed circuit 32, improve the repairing efficiency of motor 21.
Above-mentioned first oil pump and the second oil pump are that same oil pump 4, first feed circuit 31 and the second feed circuit 32 are in parallel relative to oil pump; Like this, the first feed circuit 31 and the second feed circuit 32, without the need to arranging oil pump respectively, decrease the usage quantity of oil pump, thus have saved cost of production.
Usually, oil pump can be one group of oil pump, has two or more pumps in one group of oil pump, and the low pressure oil in two feed circuits is that one group of oil pump interflow is formed.
Above-mentioned first feed circuit 31 can have two branch roads, and two branch roads detect hydraulic fluid port with oil pressure described in two of described BVD equilibrium valve 2 respectively and are communicated with, to realize the two-way oil compensation of motor 21.From theory, in elevator decline process, more easily there is motor 21 stall event, therefore, first feed circuit 31 is only set and also can realizes using function.
It is pointed out that ordinal numbers such as " first, second " described in literary composition is the different structure in order to distinguish same names, only convenient in order to describe, do not represent certain order, more should not be construed as any restriction.
Except above-mentioned hoisting hydraulic system, the present invention also provides a kind of hoist comprising above-mentioned hoisting hydraulic system, and other Each part of this hoist please refer to prior art, do not repeat them here.
Particularly, above-mentioned hoist is telescopic arm crane.
Above a kind of hoist provided by the present invention and jib lubbing mechanism thereof are described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (6)
1. the hoisting hydraulic system of a hoist, comprise the feed circuit of BVD equilibrium valve (2) and motor (21) repairing for described BVD equilibrium valve (2), it is characterized in that, described feed circuit comprises the first feed circuit (31), first oil pump of described first feed circuit (31) detects hydraulic fluid port with the oil pressure of described BVD equilibrium valve (2) and is communicated with, and described first oil pump and described oil pressure detect between hydraulic fluid port oil circuit is provided with the first one-way valve (311), described first one-way valve (311) detects hydraulic fluid port conducting from described first oil pump to described oil pressure.
2. the hoisting hydraulic system of hoist according to claim 1, it is characterized in that, also comprise the second feed circuit (32), second oil pump of described second feed circuit (32) is communicated with the repairing mouth of described BVD equilibrium valve (2), and oil circuit between described second oil pump and described repairing mouth is provided with the second one-way valve (321), described second one-way valve (321) from described second oil pump to the conducting of described repairing mouth.
3. the hoisting hydraulic system of hoist according to claim 2, it is characterized in that, described first oil pump and described second oil pump are same oil pump (4), and described first feed circuit (31) and described second feed circuit (32) are relative to described oil pump parallel connection.
4. the hoisting hydraulic system of the hoist according to any one of claims 1 to 3, it is characterized in that, described first feed circuit (31) has two branch roads, and two branch roads detect hydraulic fluid port with oil pressure described in two of described BVD equilibrium valve (2) respectively and are communicated with.
5. a hoist, comprise the hoisting hydraulic system of elevator and the described elevator action of control, it is characterized in that, described hoisting hydraulic system is the hoisting hydraulic system as described in any one of Claims 1-4.
6. hoist according to claim 5, is characterized in that, is specially telescopic arm crane.
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| CN201310433885.XA CN103466482B (en) | 2013-09-22 | 2013-09-22 | A kind of hoist and hoisting hydraulic system thereof |
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| CN201310433885.XA CN103466482B (en) | 2013-09-22 | 2013-09-22 | A kind of hoist and hoisting hydraulic system thereof |
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| CN103466482A CN103466482A (en) | 2013-12-25 |
| CN103466482B true CN103466482B (en) | 2016-02-24 |
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| CN111994811B (en) * | 2020-08-03 | 2021-09-21 | 中国铁建重工集团股份有限公司 | Hydraulic control system and engineering vehicle |
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| CN102167266A (en) * | 2011-01-24 | 2011-08-31 | 福田雷沃国际重工股份有限公司 | Main winch rapid-descent and confluent return oil regeneration system of rotary drilling rig |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2713695B2 (en) * | 1995-02-15 | 1998-02-16 | 住友建機株式会社 | Hydraulic winch device |
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2013
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| JP3559985B2 (en) * | 1998-08-19 | 2004-09-02 | 新キャタピラー三菱株式会社 | Parking brake release mechanism for traveling hydraulic motor |
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