CN102381630A - Crane and hydraulic system thereof - Google Patents
Crane and hydraulic system thereof Download PDFInfo
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- CN102381630A CN102381630A CN2011103067461A CN201110306746A CN102381630A CN 102381630 A CN102381630 A CN 102381630A CN 2011103067461 A CN2011103067461 A CN 2011103067461A CN 201110306746 A CN201110306746 A CN 201110306746A CN 102381630 A CN102381630 A CN 102381630A
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Abstract
The present invention discloses a crane and a hydraulic system thereof. The hydraulic system comprises a pressure oil source, a hydraulic cylinder and a control valve set. The pressure oil source is used for providing pressure oil. The hydraulic cylinder comprises a rodless chamber and a rod chamber. The control valve set is provided in a fluid loop between the pressure oil source and the hydraulic cylinder, and is used for controlling operation pressure of the hydraulic cylinder and flow of the fluid in the fluid loop. The control valve set comprises a reversing valve, a first throttle valve and/or a second throttle valve. The reversing valve is fluidly communicated with the rodless chamber of the hydraulic cylinder for forming a first working oil way, and is fluidly communicated with the rod chamber of the hydraulic cylinder for forming a second working oil way, thereby switching the pressure oil which is supplied from the pressure oil source for entering the rodless chamber of the hydraulic cylinder through the first working oil way or entering the rod chamber of the hydraulic cylinder through the second working oil way. The first throttle valve is provided in the first working oil way and/or the second throttle valve is provided in the second working oil way.
Description
Technical field
The present invention relates to car hosit control technology field; Particularly relate to a kind of hoisting crane and hydraulic efficiency pressure system thereof, the auxiliary that this hydraulic efficiency pressure system is mainly used in the control hoisting crane rotates to the bottom of principal arm and is recycled to the action of principal arm sidepiece from the bottom of principal arm from the sidepiece of principal arm.
Background technology
See also Fig. 1, Fig. 1 is the principal arm of a kind of hoisting crane in the prior art and the simplified side structural representation of auxiliary.This hoisting crane comprises principal arm 1 and auxiliary 2; This auxiliary 2 is through hydraulic ram 3 and articulated mounting 4 and these principal arm 10 assemblings; When this hoisting crane was not worked, this auxiliary 2 was received and kept in the bottom of this principal arm 1, during this hoisting crane work; This auxiliary 2 rotates to this principal arm 1 head to carry out crane lifting service from the bottom of this principal arm 1, and this auxiliary can be referred to as abdomen and put the formula auxiliary.
Operator's hoisting crane that drives a car for ease; The auxiliary of car hosit has carried out improving design; The head that rotates to the bottom of principal arm and further rotate to principal arm from the sidepiece of principal arm during its work is to carry out crane lifting service; The sidepiece that rotates to the bottom of principal arm and further rotate to principal arm from the head of principal arm when not working is received and kept, and this auxiliary can be referred to as side-mounted auxiliary.Receiving and keeping this auxiliary in the technological improvement of the sidepiece of principal arm is that operating personal provides comparatively open driving sight, its compared to auxiliary directly in receive and keep have in the bottom of principal arm progressive significantly.
Simultaneously, the improvement of this car hosit design has also produced the control corresponding demand, i.e. the auxiliary Stability Control that goes to the bottom of principal arm and be recycled to the sidepiece of principal arm by the bottom of principal arm from the sidepiece of principal arm.For this reason, need provide a kind of stability preferably hydraulic efficiency pressure system control the rotation that auxiliary goes to the bottom of principal arm and is recycled to principal arm by the bottom of principal arm from the sidepiece of principal arm.
In addition, in the prior art, the rotation of the auxiliary of car hosit is generally accomplished through human control, and operating process labour intensity is big, safety is not enough, and hydraulic ram has the possibility of stall, has bigger potential safety hazard.
Summary of the invention
The present invention provides a kind of hoisting crane and hydraulic efficiency pressure system thereof; Be used to control the rotation that auxiliary goes to the bottom of principal arm and is recycled to principal arm by the bottom of principal arm from the sidepiece of principal arm; And the rotation that can solve crane subsidiary arm in the prior art is generally accomplished through human control; Operating process labour intensity is big, safety is not enough, and hydraulic ram has the possibility of stall, has the problem of bigger potential safety hazard.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of hydraulic efficiency pressure system is provided, and this hydraulic efficiency pressure system comprises pressure oil-source, hydraulic ram and control cock group, and wherein, this pressure oil-source is used to provide pressure oil; This hydraulic ram comprises rodless cavity and rod chamber; This control cock is mounted in the fluid circuit of said pressure oil-source and said hydraulic ram, is used for controlling the operation pressure of said hydraulic ram and the flow of said fluid circuit fluid; Wherein, Said control cock group comprises change-over valve, first throttle valve and/or second flow regulating valve; Said change-over valve is communicated with formation first working oil path with the rodless cavity fluid of said hydraulic ram; Be communicated with formation second working oil path with the rod chamber fluid of said hydraulic ram; Said change-over valve is used to switch pressure oil that said pressure oil-source provides and gets into the rodless cavity of said hydraulic ram or get into the rod chamber of said hydraulic ram through said second working oil path through said first working oil path, and said first throttle valve is located in said first working oil path and/or said second flow regulating valve is located in said second working oil path.
According to one preferred embodiment of the present invention, said hydraulic efficiency pressure system also comprises the safe locking device that is used to control said hydraulic ram working stability.
According to one preferred embodiment of the present invention; Said safe locking device is a bidirectional hydraulic lock; Said bidirectional hydraulic lock comprises respectively the first fluid passage and the second fluid passage that is communicated with the rod chamber fluid of the rodless cavity of said hydraulic ram and said hydraulic ram, and said bidirectional hydraulic lock is used to control the telescopic location and the flexible state that pins said hydraulic ram of said hydraulic ram.
According to one preferred embodiment of the present invention; Said safe locking device is a balance cock; Said balance cock is near said hydraulic ram setting, and the pressure reduction of the pressure that the rodless cavity of said hydraulic ram is produced according to load and the pressure of said second working oil path carries out balance control.
According to one preferred embodiment of the present invention, said control cock group also comprises first check valve, and said first check valve is located in said first working oil path and is parallelly connected with said first throttle valve, is used to control said fluid nonreturn flow.
According to one preferred embodiment of the present invention, said control cock group also comprises second check valve, and said second check valve is located in said second working oil path and is parallelly connected with said second flow regulating valve, is used to control said fluid nonreturn flow.
According to one preferred embodiment of the present invention, said hydraulic efficiency pressure system also comprises fuel tank, and said change-over valve is communicated with the formation oil feeding line with said pressure oil-source; Be communicated with the formation oil return circuit with said fuel tank.
According to one preferred embodiment of the present invention, said control cock group also comprises the two-way flow rate control cock, and said two-way flow rate control cock is located in the said oil feeding line, is used to control said hydraulic ram and stretches out the speed when doing work or withdrawing acting.
According to one preferred embodiment of the present invention, said control cock group also comprises by pass valve, and said by pass valve is located in the said oil feeding line, is used to control the pressure of said pressure oil-source, and unnecessary pressure oil is transmitted back to said fuel tank.
According to one preferred embodiment of the present invention, said control cock group also comprises the two-bit triplet solenoid directional control valve, and said two-bit triplet solenoid directional control valve is located in the said oil feeding line, is used to switch said pressure oil and gets into said hydraulic efficiency pressure system or other hydraulic circuits.
For solving the problems of the technologies described above; Another technical scheme that the present invention adopts is: a kind of hoisting crane is provided; It is characterized in that; Said hoisting crane comprises principal arm and auxiliary, and said auxiliary is positioned at the sidepiece of said principal arm when not working, and rotates to the bottom of said principal arm and further rotates to the head of said principal arm from the sidepiece of said principal arm during the work of said auxiliary; Wherein, said auxiliary adopts the hydraulic efficiency pressure system of the above to control from the sidepiece that the sidepiece of said principal arm rotates to the bottom of said principal arm and is recycled to said principal arm from the bottom of said principal arm.
For solving the problems of the technologies described above; Another technical scheme that the present invention adopts is: a kind of hoisting crane is provided; Said hoisting crane comprises principal arm and auxiliary; Said auxiliary is positioned at the bottom of said principal arm when not working; Rotate to the head of said principal arm during the work of said auxiliary from the bottom of said principal arm, wherein, rotate to the head of said principal arm during said auxiliary work from the bottom of said principal arm and adopt above-mentioned hydraulic efficiency pressure system to control from the bottom that the head of said principal arm is recycled to said principal arm.
The invention has the beneficial effects as follows: the situation that is different from prior art; Hoisting crane disclosed by the invention and hydraulic efficiency pressure system thereof are applicable to the action that the control auxiliary goes to the bottom of principal arm and is recycled to the rotation of principal arm by the bottom of principal arm from the sidepiece of principal arm; Can so that the rotation of auxiliary save time, laborsaving; And safety of operation alleviates the labour intensity of artificial rotary course.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below, and obviously, the accompanying drawing in describing below only is some embodiments of the present invention; For those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings, wherein:
Fig. 1 is the principal arm of a kind of hoisting crane in the prior art and the simplified side structural representation of auxiliary;
Fig. 2 is the principal arm of hoisting crane of the present invention and the simplification cross section structure scheme drawing of auxiliary;
Fig. 3 is the structural representation that the auxiliary of hoisting crane of the present invention is positioned at the bottom of principal arm;
Fig. 4 is the structural representation that the auxiliary of hoisting crane of the present invention is positioned at the head of principal arm;
Fig. 5 is the schematic diagram of an embodiment of the hydraulic efficiency pressure system of hoisting crane of the present invention; And
Fig. 6 is the schematic diagram of another embodiment of the hydraulic efficiency pressure system of hoisting crane of the present invention.
The specific embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Please consult Fig. 2 to Fig. 4 in the lump, the embodiment of the invention provides a kind of hoisting crane, and this hoisting crane comprises principal arm 10 and auxiliary 20, and this auxiliary 20 is through these principal arm 10 assemblings of hydraulic ram 30 and articulated mounting 40 and this.
Wherein, This auxiliary 20 is positioned at the sidepiece of this principal arm 10 when not working, as shown in Figure 2, and work done rotates to this auxiliary 20 this principal arm 10 from the sidepiece of this principal arm 10 the bottom of stretching out through this hydraulic ram 30 during 20 work of this auxiliary; As shown in Figure 3; And the head that further rotates to this principal arm 10 to be to carry out crane lifting service, and as shown in Figure 4, the sidepiece that rotates to the bottom of this principal arm 10 and further rotate to this principal arm 10 from the head of this principal arm 10 is is after hours received and kept.
Wherein, this auxiliary 20 rotates to the bottom of this principal arm 10 and is recycled to the hydraulic efficiency pressure system that the sidepiece of this principal arm 10 adopts the embodiment of the invention to provide from the bottom of this principal arm 10 from the sidepiece of this principal arm 10 and controls.
Certainly; Be further rotated to the head of this principal arm 10 during 20 work of this auxiliary from the bottom of this principal arm 10 and be recycled to the hydraulic efficiency pressure system that the bottom of this principal arm 10 also can adopt inventive embodiments to provide from the head of this principal arm 10 and control, promptly this hydraulic efficiency pressure system can be used for the control that abdomen is put the formula auxiliary equally.
Particularly, see also Fig. 5, the embodiment of the invention provides a kind of hydraulic efficiency pressure system, and this hydraulic efficiency pressure system mainly comprises pressure oil-source 50, hydraulic ram 30 and control cock group 60.
Wherein, this pressure oil-source 50 is used to provide pressure oil; This hydraulic ram 30 comprises rodless cavity 32 and rod chamber 34; This control cock group 60 is located in the fluid circuit of this pressure oil-source 50 and this hydraulic ram 30, is used for controlling the operation pressure of this hydraulic ram 30 and the flow of this this fluid circuit fluid; Wherein, This control cock group 60 comprises change-over valve 61, first throttle valve 62 and/or second flow regulating valve 63; This change-over valve 61 is communicated with formation first working oil path with rodless cavity 32 fluids of this hydraulic ram 30; Be communicated with formation second working oil path with rod chamber 34 fluids of this hydraulic ram 30; This change-over valve 61 is used to switch pressure oil that this pressure oil-source 50 provides and gets into the rodless cavity 32 of this hydraulic ram 30 or get into the rod chamber 34 of this hydraulic ram 30 through this second working oil path through this first working oil path, and this first throttle valve 62 is located in this first working oil path, the flow of pressure oil when being used to control this hydraulic ram 30 and withdrawing acting; Producing back pressure simultaneously stablizes when doing work to guarantee that this hydraulic ram 30 is withdrawn; This second flow regulating valve 63 is located in this second working oil path, is used to control the flow that this hydraulic ram 30 stretches out pressure oil when doing work, and produces back pressure simultaneously and stablizes to guarantee that this hydraulic ram 30 stretches out when doing work.
In the present embodiment, this change-over valve 61 is a 3-position 4-way solenoid directional control valve 61.Certainly, in other embodiments, can also adopt other control cock to come the flow direction of control presssure oil with identical function.
In embodiments of the present invention, this hydraulic efficiency pressure system also comprises the safe locking device that is used to control these hydraulic ram 30 working stabilities.In specific embodiment; This safe locking device can be bidirectional hydraulic lock 70; This bidirectional hydraulic lock 70 comprises respectively the first pressure oil passage 72 and the second pressure oil passage 74 that is communicated with rod chamber 34 fluids of the rodless cavity 32 of this hydraulic ram 30 and this compressing cylinder 30, and this bidirectional hydraulic lock 70 is used to control the telescopic location of this hydraulic ram 30 and the flexible state of this hydraulic ram 30 of pinning.
In a preferred embodiment, this control cock group 60 also comprises first check valve 64, and this first check valve 64 is located in this first working oil path and is parallelly connected with this first throttle valve 62, is used to control this pressure oil nonreturn flow.This second check valve 65 is located in this second working oil path and is parallelly connected with this second flow regulating valve 63, is used to control this pressure oil nonreturn flow.
In a preferred embodiment, this hydraulic efficiency pressure system also comprises fuel tank 90, and this fuel tank 90 is used for fluid being provided and being used for storage and recovery operation fluid to this pressure oil-source 50, and this 3-position 4-way solenoid directional control valve 61 is communicated with the formation oil feeding line with this pressure oil-source 50; Be communicated with the formation oil return circuit with this fuel tank 90.
In a preferred embodiment, this control cock group 60 also comprises two-way flow rate control cock 66, and this two-way flow rate control cock 66 is located in this oil feeding line, is used to control this hydraulic ram 30 and stretches out the speed when doing work or withdrawing acting.
In a preferred embodiment, this control cock group 60 also comprises by pass valve 67, and this by pass valve 67 is located in this oil feeding line, is used to control the top pressure of this pressure oil, and unnecessary pressure oil is transmitted back to this fuel tank 90.
According to one preferred embodiment of the present invention, this control cock group 60 also comprises two-bit triplet solenoid directional control valve 68, and this two-bit triplet solenoid directional control valve 68 is located in this oil feeding line, is used to switch this pressure oil and gets into this hydraulic efficiency pressure system or other hydraulic circuits.
Specifically, when the electromagnet Y10 of this two-bit triplet solenoid directional control valve 68 must not electricity, the pressure oil in the pressure oil-source 50 can get into other loops, for example rotary loop from its right bit port.
When the electromagnet Y10 of this two-bit triplet solenoid directional control valve 68 gets when electric, the pressure oil in the pressure oil-source 50 gets into two-way flow rate control cock 66 through its left bit port, and is back to fuel tank 90 through the meta of this 3-position 4-way solenoid directional control valve 61, and other loops cut off simultaneously.
When need be when the sidepiece of this principal arm 10 rotates to the bottom of this principal arm 10 with auxiliary 20; The electromagnet Y11 of this 3-position 4-way solenoid directional control valve 61 gets when electric; Stretch out acting through the pressure oil of two-way flow rate control cock 66 from the rodless cavity 32 that the right bit port of two-bit triplet solenoid directional control valve 68 gets into bidirectional hydraulic locks 70 through first check valve 64 and gets into this hydraulic ram 30; Pressure oil in the rod chamber 34 of this hydraulic ram 30 is back to fuel tank 90 through the left bit port of bidirectional hydraulic lock 70, second flow regulating valve 63,3-position 4-way solenoid directional control valve 61 simultaneously, accomplishes auxiliary 20 and does from the merit that the sidepiece of this principal arm 10 rotates to the bottom of this principal arm 10.
When need be when the bottom of this principal arm 10 rotates to the sidepiece of this principal arm 10 with auxiliary 20; The electromagnet Y12 of this 3-position 4-way solenoid directional control valve 61 gets when electric; The rod chamber 34 that gets into bidirectional hydraulic locks 70 through second flow regulating valve 63 and get into this hydraulic ram 30 from the left bit port of two-bit triplet solenoid directional control valve 68 through the pressure oil of two-way flow rate control cock 66 acting of withdrawing; Pressure oil in the rodless cavity 32 of this hydraulic ram 30 is back to fuel tank 90 through the right bit port of bidirectional hydraulic lock 70, first throttle valve 62,3-position 4-way solenoid directional control valve 61 simultaneously, accomplishes the merit work that auxiliary 20 is rotated to the sidepiece of this principal arm 10 from the bottom of this principal arm 10.
What deserves to be mentioned is that the control cock group 60 among the present invention is a pile-up valve, certainly, its included various duty valves also can connect through pipeline distributed type.
Please consult Fig. 6 in the lump; The embodiment of the invention provides another kind of hydraulic efficiency pressure system, and the hydraulic efficiency pressure system shown in this hydraulic efficiency pressure system and Fig. 5 is roughly the same, and its identical part repeats no more here; Its difference is that the safe locking device in the present embodiment is replaced by balance cock 80.
This balance cock 80 is provided with near this hydraulic ram 30, and the pressure reduction of the pressure that the rodless cavity of this hydraulic ram 30 is produced according to load and the pressure of this second working oil path carries out balance control with the telescopic location of controlling this hydraulic ram 30 and the flexible state that pins this hydraulic ram 30.
Particularly, this balance cock 80 can produce the back pressure that balances each other with varying duty (like hydraulic ram 30) reliably to be stopped on a certain position with proof load, and the balance of control load motion when descending, and prevents that the load hypervelocity from descending, and prevents the generation of safety misadventure.
In the present embodiment, can cancel second flow regulating valve 63 and second check valve 65 in the hydraulic efficiency pressure system shown in Fig. 5, but this mode only can be used at abdomen and puts the formula auxiliary.It is stable when its auxiliary need overcome gravity acting and guarantees that hydraulic ram stretches out acting when the sidepiece of principal arm rotates to the bottom of principal arm that reason is side-mounted auxiliary; Guarantee that promptly auxiliary steadily transfers rotating to the bottom of principal arm, and abdomen is put the formula auxiliary to this and no requirement (NR).
In sum; One of ordinary skill in the art will readily recognize that hoisting crane disclosed by the invention and hydraulic efficiency pressure system thereof are applicable to that the control auxiliary goes to the bottom of principal arm and is recycled to the action of the rotation of principal arm by the bottom of principal arm from the sidepiece of principal arm, the rotation that can solve crane subsidiary arm in the prior art is generally accomplished through human control; Operating process labour intensity is big, safety is not enough; And hydraulic ram has the possibility of stall, has the problem of bigger potential safety hazard, can so that the rotation of auxiliary save time, laborsaving; And safety of operation alleviates the labour intensity of artificial rotary course.
It is pointed out that terms such as " first " mentioned in an embodiment of the present invention, " second " only are the indentification marks that adopts as required, in practice, be not limited to this, and this Chinese character number can be exchanged use.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification sheets of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (12)
1. a hydraulic efficiency pressure system is characterized in that, comprising:
Pressure oil-source is used to provide pressure oil;
Hydraulic ram comprises rodless cavity and rod chamber;
The control cock group is located in the fluid circuit of said pressure oil-source and said hydraulic ram, is used for controlling the operation pressure of said hydraulic ram and the flow of said fluid circuit fluid;
Wherein, Said control cock group comprises change-over valve, first throttle valve and/or second flow regulating valve; Said change-over valve is communicated with formation first working oil path with the rodless cavity fluid of said hydraulic ram; Be communicated with formation second working oil path with the rod chamber fluid of said hydraulic ram; Said change-over valve is used to switch pressure oil that said pressure oil-source provides and gets into the rodless cavity of said hydraulic ram or get into the rod chamber of said hydraulic ram through said second working oil path through said first working oil path, and said first throttle valve is located in said first working oil path and/or said second flow regulating valve is located in said second working oil path.
2. hydraulic efficiency pressure system according to claim 1 is characterized in that said hydraulic efficiency pressure system also comprises the safe locking device that is used to control said hydraulic ram working stability.
3. hydraulic efficiency pressure system according to claim 2; It is characterized in that; Said safe locking device is a bidirectional hydraulic lock; Said bidirectional hydraulic lock comprises respectively the first fluid passage and the second fluid passage that is communicated with the rod chamber fluid of the rodless cavity of said hydraulic ram and said hydraulic ram, and said bidirectional hydraulic lock is used to control the telescopic location and the flexible state that pins said hydraulic ram of said hydraulic ram.
4. hydraulic efficiency pressure system according to claim 2; It is characterized in that; Said safe locking device is a balance cock; Said balance cock is near said hydraulic ram setting, and the pressure reduction of the pressure that the rodless cavity of said hydraulic ram is produced according to load and the pressure of said second working oil path carries out balance control.
5. hydraulic efficiency pressure system according to claim 1 is characterized in that, said control cock group also comprises first check valve, and said first check valve is located in said first working oil path and is parallelly connected with said first throttle valve, is used to control said fluid nonreturn flow.
6. hydraulic efficiency pressure system according to claim 1 is characterized in that, said control cock group also comprises second check valve, and said second check valve is located in said second working oil path and is parallelly connected with said second flow regulating valve, is used to control said fluid nonreturn flow.
7. hydraulic efficiency pressure system according to claim 1 is characterized in that said hydraulic efficiency pressure system also comprises fuel tank, and said change-over valve is communicated with the formation oil feeding line with said pressure oil-source; Be communicated with the formation oil return circuit with said fuel tank.
8. hydraulic efficiency pressure system according to claim 7; It is characterized in that; Said control cock group also comprises the two-way flow rate control cock, and said two-way flow rate control cock is located in the said oil feeding line, is used to control said hydraulic ram and stretches out the speed when doing work or withdrawing acting.
9. hydraulic efficiency pressure system according to claim 7 is characterized in that, said control cock group also comprises by pass valve, and said by pass valve is located in the said oil feeding line, is used to control the pressure of said pressure oil-source, and unnecessary pressure oil is transmitted back to said fuel tank.
10. hydraulic efficiency pressure system according to claim 7; It is characterized in that; Said control cock group also comprises the two-bit triplet solenoid directional control valve, and said two-bit triplet solenoid directional control valve is located in the said oil feeding line, is used to switch said pressure oil and gets into said hydraulic efficiency pressure system or other hydraulic circuits.
11. hoisting crane; It is characterized in that; Said hoisting crane comprises principal arm and auxiliary; Said auxiliary is positioned at the sidepiece of said principal arm when not working; Rotate to the bottom of said principal arm and further rotate to the head of said principal arm from the sidepiece of said principal arm during the work of said auxiliary, wherein, the sidepiece that said auxiliary rotates to the bottom of said principal arm and is recycled to said principal arm from the bottom of said principal arm from the sidepiece of said principal arm adopts to be controlled according to any described hydraulic efficiency pressure system the claim 1 to 10.
12. hoisting crane; It is characterized in that; Said hoisting crane comprises principal arm and auxiliary, and said auxiliary is positioned at the bottom of said principal arm when not working, and rotates to the head of said principal arm during the work of said auxiliary from the bottom of said principal arm; Wherein, rotate to the head of said principal arm and adopt from the bottom that the head of said principal arm is recycled to said principal arm and to control during the work of said auxiliary from the bottom of said principal arm according to any described hydraulic efficiency pressure system the claim 1 to 10.
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| CN 201110306746 CN102381630B (en) | 2011-10-11 | 2011-10-11 | Crane and hydraulic system thereof |
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| CN 201110306746 CN102381630B (en) | 2011-10-11 | 2011-10-11 | Crane and hydraulic system thereof |
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| CN102381630A true CN102381630A (en) | 2012-03-21 |
| CN102381630B CN102381630B (en) | 2013-09-04 |
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| CN103438037A (en) * | 2013-08-06 | 2013-12-11 | 湖南星邦重工有限公司 | Lifting and dropping action hydraulic system for scissor type aerial working trolley platforms |
| CN103801428A (en) * | 2014-01-27 | 2014-05-21 | 徐州徐工施维英机械有限公司 | Flat hammer hoisting device and crawler type crusher |
| CN105485077A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Hydraulic speed governing loop system and method for axial plunger variable displacement motor |
| CN105605002A (en) * | 2016-03-18 | 2016-05-25 | 中冶赛迪工程技术股份有限公司 | Decompression-preventing hydraulic control loop and method thereof |
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| CN102979944A (en) * | 2012-11-26 | 2013-03-20 | 天脊煤化工集团股份有限公司 | Method for driving upper ash lock valve rod of coal pressure gasification furnace to act and driving device |
| CN103438037A (en) * | 2013-08-06 | 2013-12-11 | 湖南星邦重工有限公司 | Lifting and dropping action hydraulic system for scissor type aerial working trolley platforms |
| CN103438037B (en) * | 2013-08-06 | 2016-03-23 | 湖南星邦重工有限公司 | A kind of scissors type altitude job platform lifting and down maneuver hydraulic system |
| CN103801428A (en) * | 2014-01-27 | 2014-05-21 | 徐州徐工施维英机械有限公司 | Flat hammer hoisting device and crawler type crusher |
| CN103801428B (en) * | 2014-01-27 | 2016-03-02 | 徐州徐工施维英机械有限公司 | Boards hammer lifting device and crawler type disintegrating machine |
| CN105485077A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Hydraulic speed governing loop system and method for axial plunger variable displacement motor |
| CN105673605B (en) * | 2015-10-23 | 2018-03-23 | 林德（中国）叉车有限公司 | The bypass relief arrangement and unloading method of a kind of engineering truck |
| CN105673605A (en) * | 2015-10-23 | 2016-06-15 | 林德（中国）叉车有限公司 | Bypass unloading device and method for engineering vehicle |
| CN105605002A (en) * | 2016-03-18 | 2016-05-25 | 中冶赛迪工程技术股份有限公司 | Decompression-preventing hydraulic control loop and method thereof |
| CN111306005A (en) * | 2018-12-11 | 2020-06-19 | 江苏金风科技有限公司 | Hydraulic clamping system of generator barring gear |
| CN111306005B (en) * | 2018-12-11 | 2021-12-24 | 江苏金风科技有限公司 | Hydraulic clamping system of generator barring gear |
| CN111059087A (en) * | 2019-12-23 | 2020-04-24 | 中联重科股份有限公司 | Power distribution hydraulic system and crane |
| CN111059087B (en) * | 2019-12-23 | 2021-07-30 | 中联重科股份有限公司 | Power distribution hydraulic system and crane |
| CN111878470A (en) * | 2020-07-30 | 2020-11-03 | 三一重工股份有限公司 | Boom hydraulic system and operation equipment |
| CN111878470B (en) * | 2020-07-30 | 2022-02-18 | 三一重工股份有限公司 | Boom hydraulic system and operation equipment |
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