CN102705275A - Hydraulic control system for bolt and engineering machinery - Google Patents
Hydraulic control system for bolt and engineering machinery Download PDFInfo
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- CN102705275A CN102705275A CN2012102104190A CN201210210419A CN102705275A CN 102705275 A CN102705275 A CN 102705275A CN 2012102104190 A CN2012102104190 A CN 2012102104190A CN 201210210419 A CN201210210419 A CN 201210210419A CN 102705275 A CN102705275 A CN 102705275A
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Abstract
The invention provides a hydraulic control system for a bolt. The hydraulic control system is used for controlling plugging/unplugging of the bolt in a telescopic cantilever crane. The telescopic cantilever crane comprises a telescopic boom and a telescopic cylinder; and the hydraulic control system comprises a first energy accumulator, a first one-way valve, a second one-way valve, a bolt driving cylinder and a bolt reversing valve, wherein the first energy accumulator is connected to a rod cavity and a rodless cavity of the telescopic cylinder through the first one-way valve and the second one-way valve; the telescopic cylinder can pressurize the first energy accumulator during acting; and the bolt reversing valve is arranged on an oil way between the bolt driving cylinder and the first energy accumulator and is used for controlling the bolt driving cylinder to reverse so as to control the plugging/unplugging of the bolt. The invention also provides engineering machinery. By the hydraulic control system, the structure of the cylinder can be simplified, the cost is reduced, and the reliability is high.
Description
Technical field
The present invention relates to technical field of hydraulic, in particular to a kind of hydraulic control system and a kind of engineering machinery of latch.
Background technique
The latch hydraulic control system of truck crane is mainly following both at home and abroad at present: oil cylinder core pipe is set in telescopic oil cylinder; Power source as the single-cylinder bolt cylinder control system; By hydraulic oil control plugging pin oil cylinder pushing piston-rod or withdrawal piston rod, selector valve resets the back by withdraw said piston rod or release said piston rod of spring after the selector valve work.
Adopt present latch hydraulic control system, have following shortcoming:
1) the core pipe is set on telescopic oil cylinder, cylinder structure is complicated, and cost is high, and the core length of tube is long, easily flexible deformation and washed out by high pressure;
2) plugging pin oil cylinder is used spring reset, loses efficacy easily.
Summary of the invention
Technical problem to be solved by this invention is, a kind of new latch hydraulic control system is provided, and can simplify cylinder structure, reduces cost, and reliability is high.
In view of this; The invention provides a kind of hydraulic control system of latch; Be used for controlling the plug of telescopic arm support latch; Said telescopic arm support comprises telescopic boom and telescopic oil cylinder; Said hydraulic control system comprises first accumulator, first one-way valve, second one-way valve, bolt driving oil cylinder and latch selector valve, and wherein: said first accumulator is connected to the rod chamber and the rodless cavity of said telescopic oil cylinder through said first one-way valve and said second one-way valve, can be the said first accumulator pressurising during said telescopic oil cylinder action; Said latch selector valve is arranged on the oil circuit between said bolt driving oil cylinder and said first accumulator, is used to control said bolt driving oil cylinder switching-over, to control the plug of said latch.
In this technological scheme, cancelled the setting of oil cylinder inner core tube, simplified the structure of oil cylinder, reduced cost, and the action oil sources of latch takes from the rod chamber and the rodless cavity pressure oil-source of telescopic oil cylinder, control is simple, and reliability is high.
Preferably; Said latch comprises the cylinder pin of said telescopic oil cylinder and the arm pin of said telescopic boom; Said latch selector valve comprises cylinder pin selector valve and arm pin selector valve; Wherein: said cylinder pin selector valve is arranged on the oil circuit between cylinder pin driving oil cylinder and said first accumulator, is used to control said cylinder pin driving oil cylinder switching-over, to control the plug of said cylinder pin; Said arm pin selector valve is arranged on the oil circuit between said arm pin driving oil cylinder and said first accumulator, is used to control said arm pin driving oil cylinder switching-over, to control the plug of said arm pin.In this technological scheme, the parallel connection of cylinder pin and arm pin driving oil cylinder is provided with, principle is simple, the purpose that has realized adopting a control system that arm pin and cylinder pin are controlled.
Preferably, on the oil circuit between said first accumulator and the said latch selector valve, also be provided with first selector valve, be used for the through and off of this oil circuit.In this technological scheme, through the main switch that first selector valve can be used as the plug of cylinder pin and arm pin is set,, cylinder pin selector valve or arm pin selector valve do not have security risk when breaking down yet, improved the reliability of control system.
Preferably, said first selector valve is a two position three way directional control valve.
Preferably, described hydraulic control system also comprises second accumulator, is connected to the return opening of said latch selector valve.In this technological scheme, the pin-and-hole of cylinder pin or arm pin difficult to punctual employing second accumulator with less force urges cylinder pin or arm pin, attempt alignment pin holes while realize that oil cylinder or jib move, improved efficient.
Preferably; Described hydraulic control system also comprises second accumulator, the 3rd one-way valve and the 4th one-way valve; Said second accumulator is connected to the rod chamber and the rodless cavity of said telescopic oil cylinder respectively through said the 3rd one-way valve and said the 4th one-way valve, make pressure oil in said second accumulator can the said telescopic oil cylinder of unidirectional inflow in.In this technological scheme, can be the telescopic oil cylinder pressurize through second accumulator, improved the reliability of system.
Preferably, said second accumulator also is connected to the return opening of said latch selector valve.
Preferably; Said second accumulator also is connected to said first selector valve; Said second accumulator and latch selector valve break off when said first accumulator is communicated with said latch selector valve, and said first accumulator and latch selector valve break off when said second accumulator is communicated with said latch selector valve.
In this technological scheme; Can when latch is failure to actuate, the high pressure oil among the oil circuit a of first selector valve to latch selector valve be delivered in second accumulator; Reduce the oil pressure among the oil circuit a, the potential safety hazard of avoiding among the oil circuit a high pressure all the time to cause has improved the reliability of system.
Preferably, described hydraulic control system also comprises: first relief valve is arranged on the rodless cavity and the oil circuit between the said fuel tank of said telescopic oil cylinder; Second relief valve is arranged on the rod chamber and the oil circuit between the said fuel tank of said telescopic oil cylinder.In this technological scheme, first relief valve and second relief valve can avoid the rod chamber of telescopic oil cylinder or rodless cavity pressure excessive, have improved the reliability of system.
Preferably, described hydraulic control system also comprises: first hydraulic lock is arranged on the oil circuit between said cylinder pin driving oil cylinder and the said cylinder pin selector valve; And/or second hydraulic lock is arranged on the oil circuit between said arm pin driving oil cylinder and the said arm pin selector valve.In this technological scheme, adopt hydraulic lock can when cylinder pin and arm pin do not use, keep remaining static of cylinder pin and arm pin.
The present invention also provides a kind of engineering machinery, comprises each described hydraulic control system in the technique scheme.For example, engineering machinery can be hoist, and telescopic arm support is the shear leg of hoist, and hoist also comprises the pressure oil-source and second selector valve, and second selector valve is arranged on the oil circuit between pressure oil-source and the telescopic oil cylinder, is used to control the flexible of telescopic oil cylinder.
Preferably, described hoist also comprises equilibrium valve, is arranged on the oil circuit between said second selector valve and the said telescopic oil cylinder.In this technological scheme, equilibrium valve can be kept remaining static of telescopic oil cylinder when telescopic oil cylinder is not worked.
In sum,, cancelled the core pipe, simplified the structure of telescopic oil cylinder, reduced cost through the present invention; Cancelled the Returnning spring of cylinder pin, arm pin, simple in structure, rate of fault is low, improved the reliability of system; The rod chamber of employing telescopic oil cylinder and rodless cavity pressure oil-source are as the action oil sources of cylinder pin and arm pin, and control is simple.
Description of drawings
Fig. 1 is the hydraulic control system schematic diagram according to the embodiment of the invention.
Wherein, the corresponding relation between reference character and the component names is among Fig. 1:
1 telescopic oil cylinder, 2 first accumulators, 3 first one-way valves, 4 second one-way valves,
5 latch selector valves, 6 bolt driving oil cylinders, 7 the 3rd one-way valves, 8 first selector valves,
10 the 4th one-way valves, 11 second accumulators, 13 second selector valves, 14 fuel tanks,
15 first relief valves, 16 second relief valves, 17 equilibrium valves,
51 cylinder pin selector valves, 52 arm pin selector valves, 61 cylinder pin driving oil cylinder,
62 arm pin driving oil cylinder, 91 first hydraulic lock, 92 second hydraulic lock.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with accompanying drawing and embodiment.
A lot of details have been set forth in the following description so that make much of the present invention; But; The present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention does not receive the restriction of following disclosed specific embodiment.
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.Need to prove that under the situation of not conflicting, the application's embodiment and the characteristic among the embodiment can make up each other.
Fig. 1 is the hydraulic control system schematic diagram according to the embodiment of the invention.
As shown in Figure 1; The hydraulic control system of the latch in the present embodiment; Be used for controlling the plug of telescopic arm support latch; Telescopic arm support comprises telescopic boom and telescopic oil cylinder 1; Said hydraulic control system comprises first accumulator 2, first one-way valve 3, second one-way valve 4, bolt driving oil cylinder 6 and latch selector valve 5, and wherein: first accumulator 2 is connected to the rod chamber and the rodless cavity of telescopic oil cylinder 1 through first one-way valve 3 and second one-way valve 4, can be 2 pressurisings of first accumulator during telescopic oil cylinder 1 action; Latch selector valve 5 is arranged on the oil circuit between the bolt driving oil cylinder 6 and first accumulator 2, is used to control 6 switching-overs of bolt driving oil cylinder, with the plug of control latch.
Wherein, latch can be cylinder pin, arm pin etc.
In this technological scheme, cancelled the setting of oil cylinder inner core tube, simplified the structure of oil cylinder, reduced cost, and the action oil sources of latch takes from the rod chamber and the rodless cavity pressure oil-source of telescopic oil cylinder 1, control is simple, and reliability is high.
In a kind of embodiment; Latch comprises the cylinder pin of telescopic oil cylinder 1 and the arm pin of telescopic boom; Latch selector valve 5 comprises cylinder pin selector valve 51 and arm pin selector valve 52; Wherein: cylinder pin selector valve 51 is arranged on the oil circuit between the cylinder pin driving oil cylinder 61 and first accumulator 2, is used for 61 switching-overs of control cylinder pin driving oil cylinder, with the plug of control cylinder pin; Arm pin selector valve 52 is arranged on the oil circuit between the arm pin driving oil cylinder 62 and first accumulator 2, is used for 62 switching-overs of control arm pin driving oil cylinder, with the plug of control arm pin.
In this technological scheme, the parallel connection of cylinder pin and arm pin driving oil cylinder is provided with, principle is simple, the purpose that has realized adopting a control system that arm pin and cylinder pin are controlled.
Further, on the oil circuit between first accumulator 2 and the latch selector valve 5, also be provided with first selector valve 8, be used for the through and off of this oil circuit.Wherein, first selector valve 8 can be two position three way directional control valve, adopts the two-bit triplet selector valve can realize the function of this selector valve, and structure is the simplest.
In this technological scheme, through the main switch that first selector valve 8 can be used as the plug of cylinder pin and arm pin is set,, cylinder pin selector valve 51 or arm pin selector valve 52 do not have security risk when breaking down yet, improved the reliability of control system.
Further again, described hydraulic control system also comprises second accumulator 11, is connected to the return opening of latch selector valve 5.In this technological scheme, the pin-and-hole of cylinder pin or arm pin difficult to punctual employing second accumulator 7 with less force urges cylinder pin or arm pin, attempt alignment pin holes while realize that oil cylinder or jib move, improved efficient.
In addition; Described hydraulic control system also comprises can the 3rd one-way valve 7 and the 4th one-way valve 10; Second accumulator is connected to the rod chamber and the rodless cavity of telescopic oil cylinder 1 respectively through the 3rd one-way valve 7 and the 4th one-way valve 10, make pressure oil in second accumulator 11 can unidirectional inflow telescopic oil cylinder 1 in.In this technological scheme, can be telescopic oil cylinder 1 pressurize through second accumulator 11, improved the reliability of system.
Can also second accumulator 11 also be connected to first selector valve 8; For example adopt the Placement shown in the figure; Second accumulator 1 breaks off with latch selector valve 5 when first accumulator 2 is communicated with latch selector valve 5, and first accumulator 2 breaks off with latch selector valve 5 when second accumulator 11 is communicated with latch selector valve 5.In this technological scheme; Can when latch is failure to actuate, the high pressure oil among the oil circuit a of first selector valve to latch selector valve 6 be delivered in second accumulator 7; Reduce the oil pressure among the oil circuit a, the potential safety hazard of avoiding among the oil circuit a high pressure all the time to cause has improved the reliability of system.
Preferably, described hydraulic control system also comprises: first relief valve 15 is arranged on the rodless cavity and the oil circuit between the fuel tank 14 of telescopic oil cylinder 1; Second relief valve 16 is arranged on the rod chamber and the oil circuit between the fuel tank 14 of telescopic oil cylinder 1.In this technological scheme, first relief valve 15 and second relief valve 16 can avoid the rod chamber of telescopic oil cylinder 1 or rodless cavity pressure excessive, have improved the reliability of system.
Particularly, described hydraulic control system also comprises: first hydraulic lock 91 is arranged on the oil circuit between cylinder pin driving oil cylinder 61 and the cylinder pin selector valve 51; And/or second hydraulic lock 92 is arranged on the oil circuit between arm pin driving oil cylinder 62 and the arm pin selector valve 52.In this technological scheme, adopt hydraulic lock can when cylinder pin and arm pin do not use, keep remaining static of cylinder pin and arm pin.
In a kind of embodiment, each selector valve is solenoid directional control valve.Adopt solenoid directional control valve, control is simple, is easy to realize automatic control.
The present invention also provides a kind of engineering machinery, comprises each described hydraulic control system in the technique scheme.For example; Engineering machinery can be hoist, and telescopic arm support is the shear leg of hoist, and hoist also comprises the pressure oil-source and second selector valve 13; Second selector valve 13 is arranged on the oil circuit between pressure oil-source and the telescopic oil cylinder 1, is used to control the flexible of telescopic oil cylinder 1.
Further, hoist also comprises equilibrium valve 17, is arranged on the oil circuit between second selector valve 13 and the telescopic oil cylinder 1.In this technological scheme, equilibrium valve 13 can be kept remaining static of telescopic oil cylinder 1 when telescopic oil cylinder 1 is not worked.
As a kind of preferred implementation, second selector valve 13 is the hydraulic pilot control valve, adopts the hydraulic pilot control valve, and flow is bigger, can bear bigger pressure, makes the telescopic boom of hoist can adapt to more heavy weight operating mode.
Based on technique scheme, the principle of hydraulic control system is following among the present invention:
Through the present invention; Telescopic oil cylinder 1 can be cancelled the oil cylinder inner core tube; Pressure source and oil return cavity volume when plugging as cylinder arm pin respectively through first accumulator 2 and second accumulator 11, when telescopic boom moved, the pressure through hyperbaric chamber was to high pressure accumulator 2 pressurisings; Directly be communicated with oil return because of low pressure chamber simultaneously, to 11 releases of second accumulator;
Can also cancel the plugging pin oil cylinder spring; When needs carried out the plug of cylinder arm pin, through selector valve control, the pressure that utilizes first accumulator 2 to provide moved; Oil return simultaneously gets into second accumulator 11; When telescopic oil cylinder 1 moved once more, first accumulator 2 was by pressurising once more, and a work cycle is accomplished in 11 releases of second accumulator;
When telescopic oil cylinder was failure to actuate for a long time, the 2 easy releases of first accumulator can be moved telescopic oil cylinder 1 a little at this moment as need directly carry out cylinder arm pin plug before plugging, high pressure accumulator 2 is built pressure again.
The plugging condition that gets electric situation and cylinder pin and arm pin of each selector valve is as shown in table 1 during control system work:
| DT1 | DT2 | DT4 | DT5 | DT6 | DT7 | DT8 | |
| Insert the cylinder pin | - | - | - | - | - | + | + |
| Pull out the cylinder pin | - | - | - | - | + | ?- | + |
| Insert the arm pin | - | - | - | + | - | ?- | + |
| Pull out the arm pin | - | - | + | - | - | ?- | + |
| Semi-girder | + | - | - | - | - | ?- | - |
| Arm contracts | - | + | - | - | - | ?- | - |
Table 1
Particularly, the plug with the cylinder pin is an example:
Get when electric at DT1 or DT2, telescopic oil cylinder 1 moves, and can be 2 pressurisings of first accumulator simultaneously, DT8 this moment dead electricity all the time, and promptly cylinder pin and arm pin all are failure to actuate;
When needs were inserted the cylinder pin, it was electric to know that by table 1 DT7 and DT8 get, 51 switching-overs of cylinder pin selector valve, and first accumulator 1 is sent into high pressure oil in the rodless cavity of cylinder pin driving oil cylinder 61, realizes the latch action;
When needs pulled out the cylinder pin, it was electric to know that by table 1 DT6 and DT8 get, 51 switching-overs of cylinder pin selector valve, and first accumulator 1 is sent into high pressure oil in the rod chamber of cylinder pin driving oil cylinder 61, realizes pulling pin action;
All must not when electricity at DT3 ~ DT8; Cylinder pin driving oil cylinder and arm pin driving oil cylinder all are communicated with second accumulator 11; Be implemented in the pin-and-hole of cylinder pin or arm pin difficult to punctual employing second accumulator 7 with less force urges cylinder pin or arm pin; Realization oil cylinder or jib are attempted alignment pin holes while moving, and have improved efficient.
The plug of arm pin and cylinder pin principle are identical, repeat no more.
In sum,, cancelled the core pipe, simplified the structure of telescopic oil cylinder, reduced cost through the present invention; Cancelled the Returnning spring of cylinder pin, arm pin, simple in structure, rate of fault is low, improved the reliability of system; The rod chamber of employing telescopic oil cylinder and rodless cavity pressure oil-source are as the action oil sources of cylinder pin and arm pin, and control is simple.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the hydraulic control system of a latch; Be used for controlling the plug of telescopic arm support latch; Said telescopic arm support comprises telescopic boom and telescopic oil cylinder (1); It is characterized in that said hydraulic control system comprises first accumulator (2), first one-way valve (3), second one-way valve (4), bolt driving oil cylinder (6) and latch selector valve (5), wherein:
Said first accumulator (2) is connected to the rod chamber and the rodless cavity of said telescopic oil cylinder (1) through said first one-way valve (3) and said second one-way valve (4), can be said first accumulator (2) pressurising during said telescopic oil cylinder (1) action;
Said latch selector valve (5) is arranged on the oil circuit between said bolt driving oil cylinder (6) and said first accumulator (2), is used to control said bolt driving oil cylinder (6) switching-over, to control the plug of said latch.
2. hydraulic control system according to claim 1; It is characterized in that; Said latch comprises the cylinder pin of said telescopic oil cylinder (1) and the arm pin of said telescopic boom, and said latch selector valve (5) comprises cylinder pin selector valve (51) and arm pin selector valve (52), wherein:
Said cylinder pin selector valve (51) is arranged on the oil circuit between cylinder pin driving oil cylinder (61) and said first accumulator (2), is used to control said cylinder pin driving oil cylinder (61) switching-over, to control the plug of said cylinder pin;
Said arm pin selector valve (52) is arranged on the oil circuit between said arm pin driving oil cylinder (62) and said first accumulator (2), is used to control said arm pin driving oil cylinder (62) switching-over, to control the plug of said arm pin.
3. hydraulic control system according to claim 1 and 2 is characterized in that, on the oil circuit between said first accumulator (2) and the said latch selector valve (5), also is provided with first selector valve (8), is used for the through and off of this oil circuit.
4. hydraulic control system according to claim 3 is characterized in that, said first selector valve (8) is a two position three way directional control valve.
5. hydraulic control system according to claim 1 is characterized in that, also comprises second accumulator (11), is connected to the return opening of said latch selector valve (5).
6. hydraulic control system according to claim 1; It is characterized in that; Also comprise second accumulator (11), the 3rd one-way valve (7) and the 4th one-way valve (10); Said second accumulator is connected to the rod chamber and the rodless cavity of said telescopic oil cylinder (1) respectively through said the 3rd one-way valve (7) and said the 4th one-way valve (10), make pressure oil in said second accumulator (11) can the said telescopic oil cylinder of unidirectional inflow (1) in.
7. hydraulic control system according to claim 6 is characterized in that, said second accumulator (11) also is connected to the return opening of said latch selector valve (5).
8. according to claim 5 or 7 described hydraulic control systems; It is characterized in that; Said second accumulator (11) also is connected to said first selector valve (8); When said first accumulator (2) and said latch selector valve (5) said second accumulator (1) and latch selector valve (5) disconnection when being communicated with, when said second accumulator (11) and said latch selector valve (5) said first accumulator (2) and latch selector valve (5) disconnection when being communicated with.
9. hydraulic control system according to claim 1 and 2 is characterized in that, also comprises:
First relief valve (15) is arranged on the rodless cavity and the oil circuit between the said fuel tank (14) of said telescopic oil cylinder (1);
Second relief valve (16) is arranged on the rod chamber and the oil circuit between the said fuel tank (14) of said telescopic oil cylinder (1).
10. hydraulic control system according to claim 1 and 2 is characterized in that, also comprises:
First hydraulic lock (91) is arranged on the oil circuit between said cylinder pin driving oil cylinder (61) and the said cylinder pin selector valve (51); And/or,
Second hydraulic lock (92) is arranged on the oil circuit between said arm pin driving oil cylinder (62) and the said arm pin selector valve (52).
11. an engineering machinery is characterized in that, comprises said telescopic arm support and like the hydraulic control system of each described latch in the claim 1 to 10.
12. engineering machinery according to claim 11; It is characterized in that; Said engineering machinery is a hoist, and said telescopic arm support is the shear leg of said hoist, and said hoist also comprises pressure oil-source and second selector valve (13); Said second selector valve (13) is arranged on the oil circuit between said pressure oil-source and the said telescopic oil cylinder (1), is used to control the flexible of said telescopic oil cylinder (1).
13. engineering machinery according to claim 12 is characterized in that, also comprises equilibrium valve (17), is arranged on the oil circuit between said second selector valve (13) and the said telescopic oil cylinder (1).
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| CN201210210419.0A CN102705275B (en) | 2012-06-25 | 2012-06-25 | Hydraulic control system for bolt and engineering machinery |
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| CN201210210419.0A CN102705275B (en) | 2012-06-25 | 2012-06-25 | Hydraulic control system for bolt and engineering machinery |
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| CN103388598A (en) * | 2013-08-06 | 2013-11-13 | 中联重科股份有限公司 | Boom telescoping mechanism, hydraulic control system and control method thereof and crane |
| CN103790891A (en) * | 2012-10-29 | 2014-05-14 | 特雷克斯起重机德国有限公司 | Telescopic unit with additional functionality |
| CN104591012A (en) * | 2014-12-29 | 2015-05-06 | 三一汽车起重机械有限公司 | Hydraulic control system for single cylinder pin type telescopic boom and engineering machinery |
| WO2016061797A1 (en) * | 2014-10-23 | 2016-04-28 | 南京迈瑞生物医疗电子有限公司 | Hydraulic drive system for operating table |
| CN106365055A (en) * | 2016-12-02 | 2017-02-01 | 徐州重型机械有限公司 | Plug-type extending-and-contracting system and lifting machine |
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| CN103790891A (en) * | 2012-10-29 | 2014-05-14 | 特雷克斯起重机德国有限公司 | Telescopic unit with additional functionality |
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| CN103388598B (en) * | 2013-08-06 | 2015-12-02 | 中联重科股份有限公司 | Boom telescoping mechanism, hydraulic control system and control method thereof and crane |
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| CN104591012B (en) * | 2014-12-29 | 2017-02-08 | 三一汽车起重机械有限公司 | Hydraulic control system for single cylinder pin type telescopic boom and engineering machinery |
| CN104591012A (en) * | 2014-12-29 | 2015-05-06 | 三一汽车起重机械有限公司 | Hydraulic control system for single cylinder pin type telescopic boom and engineering machinery |
| CN106365055A (en) * | 2016-12-02 | 2017-02-01 | 徐州重型机械有限公司 | Plug-type extending-and-contracting system and lifting machine |
| CN106365055B (en) * | 2016-12-02 | 2018-04-17 | 徐州重型机械有限公司 | Bolt-type telescopic system and hoisting machinery |
| CN109268253A (en) * | 2018-12-01 | 2019-01-25 | 李军 | A kind of reciprocating pump of variable boost ratio |
| CN109268253B (en) * | 2018-12-01 | 2020-05-12 | 海安县石油科研仪器有限公司 | Reciprocating pump with variable pressure increasing ratio |
| CN111649022A (en) * | 2020-06-28 | 2020-09-11 | 河南卫华特种车辆有限公司 | Single-cylinder bolt control valve group, horizontal bar bolt control system and crane |
| CN114251314A (en) * | 2021-11-24 | 2022-03-29 | 徐州重型机械有限公司 | Crane hydraulic system and control method |
| CN115158577A (en) * | 2022-07-29 | 2022-10-11 | 武汉船用机械有限责任公司 | Telescopic rudder plate simulation loading device |
| CN115158577B (en) * | 2022-07-29 | 2023-06-23 | 武汉船用机械有限责任公司 | Telescopic rudder plate simulation loading device |
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