CN103466482A - Crane and hydraulic winch system thereof - Google Patents
Crane and hydraulic winch system thereof Download PDFInfo
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- CN103466482A CN103466482A CN201310433885XA CN201310433885A CN103466482A CN 103466482 A CN103466482 A CN 103466482A CN 201310433885X A CN201310433885X A CN 201310433885XA CN 201310433885 A CN201310433885 A CN 201310433885A CN 103466482 A CN103466482 A CN 103466482A
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Abstract
The invention discloses a hydraulic winch system for a crane. The hydraulic winch system comprises a BVD counterbalance valve and an oil supplement loop for supplementing oil to a motor matched with the BVD counterbalance valve; the oil supplement loop further comprises a first oil supplement loop; a first oil pump of the first oil supplement loop is communicated with the oil pressure detection port of the BVD counterbalance valve; a first one-way valve is arranged on the oil pipe between the first oil pump and the oil pressure detection port; the first one-way valve is conducted from the first oil pump to the oil pressure detection port. As the first oil supplement loop is not communicated with an oil tank in any form, low-pressure oil in the first oil supplement loop cannot lose; therefore, continuous, rapid and stable oil supplement of the motor is realized; in addition, a back pressure valve is not required to be arranged in the oil supplement loop, so that the influence of the arrangement of the back pressure valve on system pressure is avoided, and the work performance of the system is improved.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of hoisting hydraulic system of hoisting crane.The invention still further relates to a kind of hoisting crane that comprises above-mentioned hoisting hydraulic system.
Background technology
Along with the fast development of China's economic construction, market increases day by day for the demand of the especially various hoisting cranes of construction machinery and equipment, and people also improve constantly for the performance requriements of hoisting crane.Hoisting hydraulic system, for realizing hoisting and falling of load, is the important component part of crane hydraulic system, its good and bad performance that directly affects hoisting crane.
The BVD balance cock is the widely used a kind of flow-controlling gate of heavy hydraulic machinery, control thought is the throttling speed limit, its two large function is that load maintenance and speed are controlled, load keeps requiring the balance cock zero leakage, speed is controlled and is required balance cock to have good flow characteristic, can realize fine motion, as one of core parts of hoisting hydraulic system, have that drg is controlled and balance cock control two parts function.The BVD balance cock adopts slide-valve structure, elevator balance cock spool when hoisting and descend all commutates, and when change-over valve returns meta, by the guiding valve sliding surface, the motor high pressure chest is sealed, because guiding valve can't be realized zero leakage, once the excessive motor that will cause of spillage is inhaled empty stall; Therefore, need to arrange the feed circuit for motor in hoisting hydraulic system.
Please refer to Fig. 1, the local structure schematic diagram that Fig. 1 is a kind of typical hoisting hydraulic system.
The BVD balance cock 11 used in traditional hoisting hydraulic system comprises oil inlet B and the return opening A be communicated with the working position hydraulic fluid port of main valve 12, and when main valve 12, during in working position, oil inlet B is communicated with oil pump, and return opening A is communicated with fuel tank; BVD balance cock 11 also comprises that repairing mouth S and oil pressure detect a mouthful MB, the MB mouth is communicated with by pass valve 13 and motor 14, feed circuit 15 is used after Dual-pump flow-convergings as motor repairing oil sources, it is motor 14 repairings that the low pressure oil of oil pump output enters the BVD balance cock by the S mouth after check valve, and the oil pressure that feed circuit 15 provides is lower than the response pressure of by pass valve 13.
But, because the main valve valve rod connection Median Function that hoists is the Y type, handle is A, B oral fluid force feed oil sump tank after main valve, radiator when meta, and the maximum back pressure that working connection can provide after tested is about 1.5bar left and right only, shunting appears in institute's fluid infusion force feed, part hydraulic oil is through the working connection oil sump tank, poor to the repairing effect of motor, when serious, institute's fluid infusion force feed major part has all been returned to fuel tank from working connection, the unrealized repairing of motor, cause the repairing of motor unreliable, and performance inconsistency is larger.
As shown in Figure 2, for addressing the above problem adopt at present, set up check valve 16 in working connection, hydraulic oil flows into fuel tank through check valve 16, improves the back pressure of working connection by check valve, thereby avoids the loss of institute's fluid infusion force feed more.But, increase at working connection total back pressure that back pressure valve can increase again system, cause the pressure of system to increase, affect the acting characteristic of other power element of system.
Therefore, a kind of hoisting hydraulic system is provided, makes the motor repairing dependable performance of its BVD balance cock stable, and avoid it because back pressure increases, other power elements to be impacted, the serviceability of raising system, need the problem of solution badly with regard to becoming those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of hoisting hydraulic system for hoisting crane, the motor repairing dependable performance of its BVD balance cock is stable, and without back pressure valve is set, avoided because back pressure increases, other power elements being impacted, there is serviceability preferably.Another object of the present invention is to provide a kind of hoisting crane that comprises above-mentioned hoisting hydraulic system.
For solving the problems of the technologies described above, the invention provides a kind of hoisting hydraulic system of hoisting crane, comprise the BVD balance cock and be the feed circuit of the motor repairing of described BVD balance cock, described feed circuit comprises the first feed circuit, the first oil pump of described the first feed circuit detects hydraulic fluid port with the oil pressure of described BVD balance cock and is communicated with, and described the first oil pump and described oil pressure detect on the oil circuit between hydraulic fluid port and be provided with the first check valve, described the first check valve detects the hydraulic fluid port conducting from described the first oil pump to described oil pressure.
Preferably, also comprise the second feed circuit, the second oil pump of described the second feed circuit is communicated with the return opening of described BVD balance cock, and be provided with the second check valve on the oil circuit between described the second oil pump and described return opening, described the second check valve from described the second oil pump to described return opening conducting.
Preferably, described the first oil pump and described the second oil pump are same oil pump, and described the first feed circuit and described the second feed circuit are with respect to described oil pump parallel connection.
Preferably, described the first feed circuit has two branch roads, and two branch roads detect hydraulic fluid port with two described oil pressure of described BVD balance cock respectively and are communicated with.
The present invention also provides a kind of hoisting crane, comprises elevator and controls the hoisting hydraulic system that described elevator moves, and described hoisting hydraulic system is hoisting hydraulic system as above.
Further, be specially telescopic arm crane.
Hoisting hydraulic system provided by the present invention is for hoisting crane, this hoisting hydraulic system comprises the BVD balance cock and is the feed circuit of the motor repairing of supporting BVD balance cock, this feed circuit further comprises the first feed circuit, the first oil pump of the first feed circuit detects hydraulic fluid port with the oil pressure of BVD balance cock and is communicated with, and the first oil pump and described oil pressure detect on the oil circuit between hydraulic fluid port and be provided with the first check valve, the first check valve detects the hydraulic fluid port conducting from the first oil pump to oil pressure.
Because oil pressure detects by pass valve unlatching hydraulic fluid port one side that hydraulic fluid port is arranged at the BVD balance cock, and be communicated with motor, when the first oil pump of the first feed circuit and oil pressure being detected to hydraulic fluid port and being communicated with, the low pressure oil of the first oil pump output is far smaller than the response pressure of by pass valve, low pressure oil no longer directly enters motor through the structure in the BVD balance cock, has realized the quick repairing of motor; Simultaneously, because there are not any type of connected relation in the first feed circuit and fuel tank, the low pressure oil in the first feed circuit can not run off, thus realized motor continuously, fast, stablize repairing; In addition, in this feed circuit, without back pressure valve is set, avoid the impact on system pressure that arranges of back pressure valve, improved the serviceability of system.
A kind of preferred embodiment in, hoisting hydraulic system provided by the present invention also comprises the second feed circuit, the second oil pump of this second feed circuit is communicated with the return opening of BVD balance cock, and be provided with the second check valve on the oil circuit between the second oil pump and return opening, the second check valve from described the second oil pump to the return opening conducting; When repairing, the low pressure oil of the second oil pump output enters the BVD balance cock by return opening, and then enters motor and realize repairing; Like this, by auxiliary the first feed circuit repairing of the second feed circuit, improved 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, and the first feed circuit and the second feed circuit are with respect to the oil pump parallel connection; Like this, the first feed circuit and the second feed circuit, without oil pump is set respectively, have reduced the usage quantity of oil pump, thereby have saved productive costs.
The accompanying drawing explanation
The local structure schematic diagram that Fig. 1 is a kind of typical hoisting hydraulic system;
The local structure schematic diagram that Fig. 2 is another kind of typical hoisting hydraulic system;
The structural representation that Fig. 3 is a kind of specific embodiment of hoisting hydraulic system provided by the present invention.
The specific embodiment
Core of the present invention is to provide a kind of hoisting hydraulic system for hoisting crane, the motor repairing dependable performance of its BVD balance cock is stable, and without back pressure valve is set, avoided because back pressure increases, other power elements being impacted, there is serviceability preferably.Another core of the present invention is to provide a kind of hoisting crane that comprises above-mentioned hoisting hydraulic system.
In order to make those skilled in the art person understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 3, the structural representation that Fig. 3 is a kind of specific embodiment of hoisting hydraulic system provided by the present invention.
In a kind of specific embodiment, hoisting hydraulic system provided by the present invention is for hoisting crane, this hoisting hydraulic system comprises BVD balance cock 2 and is the feed circuit of motor 21 repairings of supporting BVD balance cock 2, this BVD balance cock 2 is identical with the BVD balance cock 2 used in traditional hoisting hydraulic system, all comprise the oil inlet B be communicated with the working position hydraulic fluid port of main valve, and return opening A, when main valve during in working position, oil inlet B is communicated with oil pump, and return opening A is communicated with fuel tank; BVD balance cock 2 also comprises that repairing mouth S and oil pressure detect a mouthful MB, and the MB mouth is communicated with by pass valve and motor 21; Above-mentioned feed circuit further comprises the first feed circuit 31, the first oil pump of the first feed circuit 31 detects hydraulic fluid port with the oil pressure of BVD balance cock 2 and is communicated with, and be provided with the first check valve 311, the first check valves 311 on the oil circuit between the first oil pump and described oil pressure detection hydraulic fluid port and detect the hydraulic fluid port conducting from the first oil pump to oil pressure.
It is pointed out that the response pressure that detects the by pass 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 interior low pressure oil of feed circuit can not cause the unlatching of by pass valve, and this should be common practise when repairing designs.
Because oil pressure detects by pass valve unlatching hydraulic fluid port one side that hydraulic fluid port is arranged at BVD balance cock 2, and be communicated with motor 21, when the first oil pump of the first feed circuit 31 and oil pressure being detected to hydraulic fluid port and being communicated with, the low pressure oil of the first oil pump output is far smaller than the response pressure of by pass valve, low pressure oil no longer directly enters motor 21 through the structure in BVD balance cock 2, has realized the quick repairing of motor 21; Simultaneously, because there are not any type of connected relation in the first feed circuit 31 and fuel tank, the low pressure oil in the first feed circuit 31 can not run off, thus realized motor 21 continuously, fast, stablize repairing; In addition, in this feed circuit, without back pressure valve is set, avoid the impact on system pressure that arranges of back pressure valve, improved the serviceability of system.
Hoisting hydraulic system provided by the present invention also comprises the second feed circuit 32, the second oil pump of this second feed circuit 32 is communicated with the return opening of BVD balance cock 2, and on the oil circuit between the second oil pump and return opening, be provided with the second check valve 321, the second check valves 321 from described the second oil pump to the return opening conducting; When repairing, the low pressure oil of the second oil pump output enters BVD balance cock 2 by return opening, and then enters motor 21 and realize repairing; Like this, by auxiliary the first feed circuit 31 repairings of the second feed circuit 32, improved the repairing efficiency of motor 21.
Above-mentioned the first oil pump and the second oil pump are that same oil pump 4, the first feed circuits 31 and the second feed circuit 32 are with respect to the oil pump parallel connection; Like this, the first feed circuit 31 and the second feed circuit 32, without oil pump is set respectively, has reduced the usage quantity of oil pump, thereby have saved productive costs.
Usually, oil pump can be one group of oil pump, in one group of oil pump, has two or more pumps, and the low pressure oil in two feed circuits is that one group of oil pump interflow forms.
Above-mentioned the first feed circuit 31 can have two branch roads, and two branch roads detect hydraulic fluid port with two described oil pressure of described BVD balance cock 2 respectively and are communicated with, to realize the two-way oil compensation of motor 21.From theory, motor 21 stall phenomenons more easily occurring in elevator decline process, therefore, first feed circuit 31 only is set and also can realizes using function.
To it is pointed out that ordinal numbers such as " first, second " described in literary composition is in order to distinguish the different structure of same names, only in order narrating conveniently, not mean certain order, more should not be construed as any restriction.
Except above-mentioned hoisting hydraulic system, the present invention also provides a kind of hoisting crane that comprises above-mentioned hoisting hydraulic system, and other each several part structures of this hoisting crane please refer to prior art, do not repeat them here.
Particularly, above-mentioned hoisting crane is telescopic arm crane.
Above a kind of hoisting crane provided by the present invention and luffing mechanism thereof are described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.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 improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (6)
1. the hoisting hydraulic system of a hoisting crane, comprise BVD balance cock (2) and be the feed circuit of motor (21) repairing of described BVD balance cock (2), it is characterized in that, described feed circuit comprises the first feed circuit (31), the first oil pump of described the first feed circuit (31) detects hydraulic fluid port with the oil pressure of described BVD balance cock (2) and is communicated with, and described the first oil pump and described oil pressure detect on the oil circuit between hydraulic fluid port and be provided with the first check valve (311), described the first check valve (311) detects the hydraulic fluid port conducting from described the first oil pump to described oil pressure.
2. the hoisting hydraulic system of hoisting crane according to claim 1, it is characterized in that, also comprise the second feed circuit (32), the second oil pump of described the second feed circuit (32) is communicated with the return opening of described BVD balance cock (2), and be provided with the second check valve (321) on the oil circuit between described the second oil pump and described return opening, described the second check valve (321) from described the second oil pump to described return opening conducting.
3. the hoisting hydraulic system of hoisting crane according to claim 2, it is characterized in that, described the first oil pump and described the second oil pump are same oil pump (4), and described the first feed circuit (31) and described the second feed circuit (32) are with respect to described oil pump parallel connection.
4. according to the hoisting hydraulic system of the described hoisting crane of claims 1 to 3 any one, it is characterized in that, described the first feed circuit (31) has two branch roads, and two branch roads detect hydraulic fluid port with two described oil pressure of described BVD balance cock (2) respectively and are communicated with.
5. a hoisting crane, comprise elevator and control the hoisting hydraulic system that described elevator moves, and it is characterized in that, described hoisting hydraulic system is hoisting hydraulic system as described as claim 1 to 4 any one.
6. hoisting crane according to claim 5, is characterized in that, is specially telescopic arm crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310433885.XA CN103466482B (en) | 2013-09-22 | 2013-09-22 | A kind of hoist and hoisting hydraulic system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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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 true CN103466482A (en) | 2013-12-25 |
| CN103466482B CN103466482B (en) | 2016-02-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111994811A (en) * | 2020-08-03 | 2020-11-27 | 中国铁建重工集团股份有限公司 | Hydraulic control system and engineering vehicle |
Citations (8)
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|---|---|---|---|---|
| JPH08217387A (en) * | 1995-02-15 | 1996-08-27 | Sumitomo Constr Mach Co Ltd | Hydraulic winch device |
| 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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| CN203532368U (en) * | 2013-09-22 | 2014-04-09 | 徐州重型机械有限公司 | Crane and hoisting hydraulic system thereof |
-
2013
- 2013-09-22 CN CN201310433885.XA patent/CN103466482B/en active Active
Patent Citations (8)
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|---|---|---|---|---|
| JPH08217387A (en) * | 1995-02-15 | 1996-08-27 | Sumitomo Constr Mach Co Ltd | Hydraulic winch device |
| 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 |
| JP4049304B2 (en) * | 2002-07-05 | 2008-02-20 | イワフジ工業株式会社 | Two-body winch hydraulic system |
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| CN102718162A (en) * | 2012-06-29 | 2012-10-10 | 上海三一科技有限公司 | Winch hydraulic system safety device and crane |
| CN102815633A (en) * | 2012-09-03 | 2012-12-12 | 上海中联重科桩工机械有限公司 | Control device for hydraulic winch and engineering machine |
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Non-Patent Citations (1)
| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111994811A (en) * | 2020-08-03 | 2020-11-27 | 中国铁建重工集团股份有限公司 | Hydraulic control system and engineering vehicle |
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| CN103466482B (en) | 2016-02-24 |
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