CN101920910B - Closed hydraulic system of main actuating mechanism of crawler crane - Google Patents
Closed hydraulic system of main actuating mechanism of crawler crane Download PDFInfo
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- CN101920910B CN101920910B CN 200910052932 CN200910052932A CN101920910B CN 101920910 B CN101920910 B CN 101920910B CN 200910052932 CN200910052932 CN 200910052932 CN 200910052932 A CN200910052932 A CN 200910052932A CN 101920910 B CN101920910 B CN 101920910B
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Abstract
The invention discloses a closed hydraulic system of a main actuating mechanism of a crawler crane. The closed hydraulic system of the main actuating mechanism of the crawler crane comprises at least two closed variable pumps and at least three actuating mechanisms, wherein one of the two actuating mechanisms corresponds to a first closed variable pump, while the other corresponds to a second closed variable pump; first, second, and third control valve groups respectively correspond to the three actuating mechanisms; and a fourth control valve group is used for switching an oil circuit during a compound action. The closed hydraulic system of the main actuating mechanism of the crawler crane controls a larger number of actuating mechanisms by a smaller number of the closed variable pumps, has low cost and high utilization rate of engine power, and can perform a larger number of compound actions.
Description
Technical field
The present invention relates to the crawler crane hydraulic efficiency pressure system, particularly a kind of closed hydraulic system of main actuating mechanism of crawler crane with transfer valve
Background technology
Crawler crane is except swing type mechanism, mainly contain other seven kinds of main actuating mechanisms, be respectively main and promote elevator, secondaryly promote elevator, main transformer width of cloth elevator, secondary luffing elevator, surpassed the luffing elevator, left lateral walks mechanism and right lateral is walked mechanism's (possible different manufacturers has the different institutions title).Wherein main lifting elevator can be one or more.
Domestic and most foreign crawler cranes main actuating mechanism hydraulic efficiency pressure systems are mainly open-circuit system, open-circuit system is because necessary balance valve, under the fine motion state of low discharge, be prone to and move not plateau problem, and the low system of driving efficiency cal val is large, and therefore more external crawler crane producers have adopted advanced closed fhdraulic system.It is little that closed fhdraulic system has circuit pressure loss, operates steadily and the advantage such as compact conformation.
Usually closed system drives a kind of actuating unit with an oil pump, has adopted 8 enclosed oil pumps to drive 7 kinds of main actuating mechanisms (wherein the main elevator that promotes has 2) such as U.S. Manitowoc.Adopt the oil circuit switching mode, can reduce oil pump quantity.36 logical oil circuit transfer valves have been used on the LR1400 crawler crane such as German Liebherr, the mode that the part loop adopts oil circuit to switch, 3 oil pumps have been saved, only 7 kinds of identical main actuating mechanisms (wherein the main elevator that promotes has 2) have been driven with 5 enclosed pumps, the major defect that its scheme exists is: 1, part main actuating mechanism oil circuit needs through two transfer valves, and loss of pressure is larger; 2, some composite move is difficult to realize.
Summary of the invention
The purpose of this invention is to provide a kind of main actuating mechanism of crawler crane hydraulic efficiency pressure system, have power utilization height, stable, the advantage such as operation is reliable.
The technical solution adopted in the present invention is:
A kind of main actuating mechanism of crawler crane closed system, it comprises, at least 2 enclosed controllable capacity pumps, at least 3 actuating units, it comprises variable-dis-placement motor or/and fixed displacement motor; Wherein, 2 corresponding the first enclosed controllable capacity pumps of actuating unit, corresponding the second enclosed controllable capacity pump of another actuating unit; The first～the 3rd control cock group, respectively corresponding above-mentioned 3 actuating units, each control cock group comprises respectively, two logic inserted valves, its oil-feed port connect respectively two ends B mouth, the A mouth of actuating unit variable-dis-placement motor or fixed displacement motor; Its fuel-displaced port connects respectively ends A a mouth, Ba mouth, Ab mouth, the Bb mouth of first and second enclosed controllable capacity pump; The control port of these two logic inserted valves is connected by oil circuit; A two-position four-way solenoid valve, the control port of described two logic inserted valves are connected in this two-position four-way solenoid valve after being connected by oil circuit; Wherein, the two-position four-way solenoid valve oil inlet of 2 of corresponding the first enclosed controllable capacity pump control cock groups is communicated with by oil circuit; The two-position four-way solenoid valve oil inlet of counterlogic inserted valve control port is connected by oil circuit; The 4th control cock group, the oil circuit when being used for composite move switches; It comprises, a two-position four-way solenoid valve, and an one oil inlet is communicated with by oil circuit with the two-position four-way solenoid valve oil inlet of 2 control cock groups of corresponding the first enclosed controllable capacity pump, and connects oil sump tank; Two logic inserted valves, its control port is connected by the two-position four-way solenoid valve oil inlet of oil circuit with counterlogic inserted valve control port; Its fuel-displaced port connects respectively the Ba mouth of the first enclosed controllable capacity pump; Its oil-feed port connects respectively the actuating unit variable-dis-placement motor of corresponding the second enclosed controllable capacity pump or two ends B mouth, the A mouth of fixed displacement motor.
Further, also comprise respectively two by pass valves in the described control cock group, be arranged in parallel in opposite directions respectively 2 oil circuits that between two logic inserted valve oil-feed ports, are arranged in parallel.
Again, the oil-feed port of two logic inserted valves is communicated with by oil circuit in the described control cock group, and series connection arranges 2 check valves in opposite directions in this oil circuit, and the oil circuit between 2 check valves arranges the oil circuit that an oil circuit is connected to the two-position four-way solenoid valve oil inlet of counterlogic inserted valve control port.
In addition, be communicated with by oil circuit between two fuel-displaced ports of logic inserted valve of described control cock group, and series connection arranges 2 check valves in opposite directions in this oil circuit, and the oil circuit between 2 check valves arranges the oil circuit that an oil circuit is connected to the two-position four-way solenoid valve oil inlet of counterlogic inserted valve control port.
Described actuating unit is composed in parallel by 2 variable-dis-placement motors, perhaps, is composed in parallel by 2 fixed displacement motors.
The invention has the advantages that:
The present invention controls a greater number actuating unit with lesser amt enclosed controllable capacity pump, and cost is low, and the engine power degree of utilization is high; Can carry out more composite move.
The present invention uses closed system, and the quantity of enclosed controllable capacity pump is less than the quantity of actuating unit;
Can arrange actuating unit according to the demand of composite move.For example suppose that actuating unit I and II need to carry out composite move, and actuating unit I and IV do not need to carry out composite move, then the position of actuating unit I and IV are exchanged.
Can come change control valve group according to the quantity of actuating unit and the requirement of composite move, with adaption demand.
With the control cock group that the logic inserted valve forms, flow is large, loss of pressure is little, high pressure resistant, and cost is low.
Description of drawings
Fig. 1 is the closed fhdraulic system schematic diagram of band switching control valve group of the present invention;
Fig. 2 is the closed fhdraulic system scheme drawing of first embodiment of the invention;
Fig. 3 is the closed fhdraulic system schematic diagram of second embodiment of the invention;
Fig. 4 is the closed fhdraulic system schematic diagram of third embodiment of the invention.
The specific embodiment
Referring to Fig. 1, Fig. 2, main actuating mechanism of crawler crane closed system of the present invention, it comprises that 2 enclosed controllable capacity pumps (the first enclosed controllable capacity pump 1, the second enclosed controllable capacity pump 2), 4 actuating unit I, II, III, IV, 4 control cock groups 3～6,1 oil circuit switch with control cock group 7.
4 actuating unit I, II, III, IV, it comprises variable-dis-placement motor or/and fixed displacement motor;
2 corresponding the first enclosed controllable capacity pumps 1 of actuating unit I, II, corresponding the second enclosed controllable capacity pump 2 of another actuating unit;
Control cock group 3～6, respectively corresponding above-mentioned 4 actuating units, wherein, control cock group 3,4 corresponding the first enclosed controllable capacity pumps 1, control cock group 5,6 corresponding the second enclosed controllable capacity pumps 2;
Each control cock group (take control cock group 3 as example) comprises respectively, two logic inserted valves 31,32, and its oil-feed port connects respectively two ends B mouth, the A mouth of actuating unit I variable-dis-placement motor or fixed displacement motor; Its fuel-displaced port connects respectively ends A a mouth, the Ba mouth of the first enclosed controllable capacity pump 1; These two logic inserted valves 31,32 control port are connected by oil circuit; A two-position four-way solenoid valve 33 is connected in this two-position four-way solenoid valve 33 after described two logic inserted valves 31,32 control port are connected by oil circuit;
2 control cock groups 3 of corresponding the first enclosed controllable capacity pump 1,4 two-position four-way solenoid valve 33,43 oil inlets are communicated with by oil circuit; Two-position four-way solenoid valve 33,43 oil inlets of counterlogic inserted valve 31,32,41,42 control ports are connected by oil circuit;
2 control cock groups 5 of corresponding the second enclosed controllable capacity pump 2,6 two-position four-way solenoid valve 53 oil inlets are communicated with by oil circuit; Two-position four-way solenoid valve 53 oil inlets of counterlogic inserted valve 51,52,61,62 control ports are connected by oil circuit;
Two logic inserted valves 71 in the control cock group 7,72 oil-feed port are communicated with by oil circuit, and series connection arranges oil circuit between 2 check valves 74,75,2 check valves 74,75 and one oil circuit is set is connected to the two-position four-way solenoid valve 33 of counterlogic inserted valve 31,41 control ports, the oil circuit of 43 oil inlets in opposite directions in this oil circuit.
Also comprise respectively two by pass valves 34,35 in the described control cock group (take control cock group 3 as example), be arranged in parallel in opposite directions respectively 2 oil circuits that between two logic inserted valves 31,32 oil-feed ports, are arranged in parallel.Again, these two logic inserted valves 31,32 oil-feed port are communicated with by oil circuit, and series connection arranges oil circuit between 2 check valves 36,37,2 check valves 36,37 and one oil circuit is set is connected to the two-position four-way solenoid valve 33 of counterlogic inserted valve 31,41 control ports, the oil circuit of 43 oil inlets in opposite directions in this oil circuit.
In addition, be communicated with by oil circuit between described control cock group 3,5 two logic inserted valves 31,32,51, the 52 fuel-displaced ports, and series connection arranges 2 check valves 8,9,10,11 in opposite directions in this oil circuit, check valve 8,9 and check valve 10,11 between oil circuit one oil circuit be set be connected to the two-position four-way solenoid valve 33 of counterlogic inserted valve 31,51 control ports, the oil circuit of 53 oil inlets.
Described actuating unit is composed in parallel by 2 variable-dis-placement motors, perhaps, is composed in parallel by 2 fixed displacement motors.
The actuating unit single movement
Actuating unit I single movement, then two-position four-way solenoid valve 33 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 1 work.The Aa mouth of supposing controllable capacity pump 1 is oil outlet, and the Ba mouth is that return opening and high-pressure mouth are that (selection of oil outlet and return opening is to realize by changing the variable capacity of pump to the Ba mouth; And for the main actuating mechanism of crawler crane, high-pressure mouth all is to promote mouthful), then hydraulic oil enters into logic inserted valve 31,41,71.Because Ba is high-pressure mouth, then high pressure oil enters into two-position four-way solenoid valve 33,43,73 by check valve 9, and check valve 8 is closed simultaneously.Because it is electric that two-position four-way solenoid valve 33 gets, make logic inserted valve 31,32 oil circuit control by two-position four-way solenoid valve 33 and T mouth oil sump tank, then hydraulic oil also passes through the B mouth that the A1 mouth enters into actuating unit I variable-dis-placement motor by logic inserted valve 31, makes actuating unit I action.Hydraulic oil passes through A mouth and the B1 mouth of actuating unit I variable-dis-placement motor again, and enters the Ba mouth of controllable capacity pump 1 for 32 times by the logic inserted valve, realizes the oil circuit closed cycle.Wherein, check valve 36,37 effect be can by actuating unit I logic inserted valve 31,32 self-lockings, close, make actuating unit I safer; By pass valve 34,35 plays the safety valve effect, and the B of assurance actuating unit I variable-dis-placement motor, A mouth peak pressure are protected motor within by pass valve 34,35 setting ranges.During actuating unit I counteragent, namely the Ba mouth of controllable capacity pump 1 is oil outlet, and the Aa mouth is return opening, and is identical with above-mentioned analysis situation.
Actuating unit II single movement, then two-position four-way solenoid valve 43 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 1 work.Particular case and actuating unit I single movement are similar.
Actuating unit IV single movement, then two-position four-way solenoid valve 53 and the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 2 work.Particular case and actuating unit I single movement are similar.
Actuating unit III single movement, then two-position four-way solenoid valve 53 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 2 work.Particular case and actuating unit I single movement are similar.It is to be noted that the high pressure oil of this moment A4 or B4 closes logic inserted valve 71,72 by check valve 74 or 75, prevents that high pressure oil from sealing in the controllable capacity pump 1.
The actuating unit composite move.
Actuating unit I and actuating unit IV composite move, then two-position four-way solenoid valve 33 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 2,1 is worked.Similar when particular case and its single movement.
Actuating unit I and actuating unit III composite move, then two-position four-way solenoid valve 33 and 53 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 2,1 is worked.Similar when particular case and its single movement.
Actuating unit II and actuating unit IV composite move, then two-position four-way solenoid valve 43 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 2,1 is worked.Similar when particular case and its single movement.
Actuating unit II and actuating unit III composite move, then two-position four-way solenoid valve 43 and 53 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 2,1 is worked.Similar when particular case and its single movement.
Actuating unit I and actuating unit II can not carry out composite move.
Actuating unit III and actuating unit IV composite move, then two-position four-way solenoid valve 73 must be electric, the equal dead electricity of all the other two-position four-way solenoid valves, and controllable capacity pump 2,1 is worked.Actuating unit III provides pressure oil by controllable capacity pump 1.Controllable capacity pump 1 fluid enters into A, the B mouth of actuating unit III variable-dis-placement motor by logic inserted valve 71,72.This moment, the high pressure oil of A4 or B4 closed logic inserted valve 71,72 by check valve 56 or 57, prevented that controllable capacity pump 1 high pressure oil from sealing in the controllable capacity pump 2.Actuating unit IV provides pressure oil by controllable capacity pump 2.Similar when particular case and its single movement.It is to be noted that working as actuating unit III moves first, then carry out composite move with actuating unit IV, this process need has strict control program to realize.
Referring to Fig. 3, Fig. 4, be respectively the closed fhdraulic system scheme drawing of second, third embodiment shown in it.
Wherein, closed fhdraulic system has three control cock groups 3～5,1 switching with control cock group 7 among the second embodiment; Closed fhdraulic system has three control cock groups 3,5,6,1 switchings with control cock group 7 among the 3rd embodiment.
The present invention controls a greater number actuating unit with lesser amt enclosed controllable capacity pump, and cost is low, and the engine power degree of utilization is high; Can carry out more composite move.
Claims (6)
1. a main actuating mechanism of crawler crane closed system is characterized in that, comprise,
Two enclosed controllable capacity pumps,
Three actuating units, it comprises variable-dis-placement motor or/and fixed displacement motor; Corresponding the first enclosed controllable capacity pumps of two actuating units wherein, the corresponding second enclosed controllable capacity pump of another actuating unit;
The first～the 3rd control cock group, corresponding above-mentioned three actuating units respectively, it comprises respectively,
Two logic inserted valves, its oil-feed port connect respectively two ends B mouth, the A mouth of actuating unit variable-dis-placement motor or fixed displacement motor; Its fuel-displaced port is connected with ends A a mouth, the Ba mouth of the first enclosed controllable capacity pump or is connected with ends A b mouth, the Bb mouth of the second enclosed controllable capacity pump; The control port of these two logic inserted valves is connected by oil circuit;
A two-position four-way solenoid valve, the control port of described two logic inserted valves are connected in this two-position four-way solenoid valve after connecting by oil circuit;
Wherein, the two-position four-way solenoid valve oil inlet of 2 of corresponding the first enclosed controllable capacity pump control cock groups is communicated with by oil circuit; The two-position four-way solenoid valve oil inlet of counterlogic inserted valve control port is connected by oil circuit;
The 4th control cock group, the oil circuit when being used for composite move switches; Comprise,
A two-position four-way solenoid valve, an one oil inlet is communicated with by oil circuit with the two-position four-way solenoid valve oil inlet of 2 control cock groups of corresponding the first enclosed controllable capacity pump, and connects oil sump tank;
Two logic inserted valves, its control port is connected by the two-position four-way solenoid valve oil inlet of oil circuit with counterlogic inserted valve control port; Its fuel-displaced port connects respectively the Ba mouth of the first enclosed controllable capacity pump; Its oil-feed port connects respectively the actuating unit variable-dis-placement motor of corresponding the second enclosed controllable capacity pump or two ends B mouth, the A mouth of fixed displacement motor.
2. main actuating mechanism of crawler crane closed system as claimed in claim 1, it is characterized in that, also comprise respectively two by pass valves in described the first to the 3rd control cock group, be arranged in parallel in opposite directions respectively 2 oil circuits that between two logic inserted valve oil-feed ports, are arranged in parallel.
3. main actuating mechanism of crawler crane closed system as claimed in claim 1, it is characterized in that, the oil-feed port of two logic inserted valves is communicated with by oil circuit in the described control cock group, and series connection arranges 2 check valves in opposite directions in this oil circuit, and the oil circuit between 2 check valves arranges the oil circuit that an oil circuit is connected to the two-position four-way solenoid valve oil inlet of counterlogic inserted valve control port.
4. main actuating mechanism of crawler crane closed system as claimed in claim 1 is characterized in that, described actuating unit is composed in parallel by several variable-dis-placement motors.
5. main actuating mechanism of crawler crane closed system as claimed in claim 1 is characterized in that, described actuating unit is composed in parallel by several fixed displacement motors.
6. main actuating mechanism of crawler crane closed system as claimed in claim 1 is characterized in that, described actuating unit is composed in parallel by several fixed displacement motors and several variable-dis-placement motors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910052932 CN101920910B (en) | 2009-06-11 | 2009-06-11 | Closed hydraulic system of main actuating mechanism of crawler crane |
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| CN 200910052932 CN101920910B (en) | 2009-06-11 | 2009-06-11 | Closed hydraulic system of main actuating mechanism of crawler crane |
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| CN101920910A CN101920910A (en) | 2010-12-22 |
| CN101920910B true CN101920910B (en) | 2013-01-23 |
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| CN102650303A (en) * | 2011-02-24 | 2012-08-29 | 中联重科股份有限公司 | Power-driven device of concrete pumping equipment and concrete pumping equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4319271A1 (en) * | 1992-06-16 | 1993-12-23 | Josef Brosowitsch | Hydraulic excavator or crane - has conventional transmission with engines, fastened to superstructure |
| CN2474762Y (en) * | 2001-04-28 | 2002-01-30 | 徐州重型机械厂 | Liquid ratio control closed system lifting hydraulic device |
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2009
- 2009-06-11 CN CN 200910052932 patent/CN101920910B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4319271A1 (en) * | 1992-06-16 | 1993-12-23 | Josef Brosowitsch | Hydraulic excavator or crane - has conventional transmission with engines, fastened to superstructure |
| CN2474762Y (en) * | 2001-04-28 | 2002-01-30 | 徐州重型机械厂 | Liquid ratio control closed system lifting hydraulic device |
Non-Patent Citations (2)
| Title |
|---|
| JP昭57-110803A 1982.07.09 |
| JP特開平10-310365A 1998.11.24 |
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Effective date of registration: 20160112 Address after: Eight in the 313028 Zhejiang city of Huzhou province Cao Zhen Village daily standard factory Auxiliary Building No. 2 Patentee after: Zhejiang Sany Equipment Co., Ltd. Address before: 201200 Shanghai City Sichuan Road Pudong New Area Chuansha economic Park No. 319 Patentee before: Shanghai Sany Technology Co., Ltd. |