CN102030267B - Hoist and closed hydraulic system thereof - Google Patents
Hoist and closed hydraulic system thereof Download PDFInfo
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- CN102030267B CN102030267B CN201110009311A CN201110009311A CN102030267B CN 102030267 B CN102030267 B CN 102030267B CN 201110009311 A CN201110009311 A CN 201110009311A CN 201110009311 A CN201110009311 A CN 201110009311A CN 102030267 B CN102030267 B CN 102030267B
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Abstract
The invention discloses a closed hydraulic system comprising a motor, a hydraulic pump for driving the motor to work and explosion-protection equipment. The explosion-protection equipment comprises a hydraulic control one-way valve and a first reversing valve, wherein the hydraulic control one-way valve is arranged on a passage from an oil outlet at the high pressure side of the hydraulic pump to an oil inlet at the high pressure side of the motor; the first reversing valve is arranged on a passage from an oil control port of the hydraulic control one-way valve to the oil inlet at the high pressure side of the motor; when the first reversing valve is in a first working position, the oil control port of the hydraulic control one-way valve is communicated with an oil tank; and when the first reversing valve is in a second working position, the oil control port is communicated with the oil inlet at the high pressure side of the motor. The explosion-protection equipment in the hydraulic system can lock the motor when a high-pressure pipeline explodes by adopting the hydraulic control one-way valve and the first reversing valve and always has enough pressure for opening the hydraulic control one-way valve during falling operation, and is in a relatively stable working state. The invention also provides a hoist comprising the closed hydraulic system.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of closed fhdraulic system.The invention still further relates to a kind of hoisting crane that comprises above-mentioned closed fhdraulic system.
Background technology
Hoisting crane is mainly realized the lifting and the whereabouts of load through the folding and unfolding of hoisting rope; The folding and unfolding of hoisting rope then is to be controlled by the rotation of hoist motor; Hoist motor is by hydraulic pump drive, and elements such as hoist motor and Hydraulic Pump form the hydraulic efficiency pressure system that control load goes up and down.
The hydraulic efficiency pressure systems such as walking of the up-down of hoister in large tonnage, revolution and crawler crane adopt closed system usually, and closed system has performance reliably.
Enclosed elevator hydraulic efficiency pressure system is made up of elements such as enclosed pump, motors usually; The import and export of enclosed pump and motor generally directly link to each other through sebific duct; When enclosed pump elevator is sling load; Pipeline between the one side oil outlet of enclosed pump and the oil inlet of motor is a pressure duct, keeps rising stable of load through the sealing cavity volume between motor and the enclosed pump; When load was fallen, the pipeline between the opposite side oil outlet of enclosed pump and the oil inlet of motor was a low pressure line, main falling speed through control motor and enclosed capacity of pump control load.
Can know from the principle of work of enclosed elevator hydraulic efficiency pressure system; If the pressure duct generation explosion of closed system then keeps the motor of load and the sealing cavity volume between the enclosed pump to disappear, the load meeting drives the motor counter-rotating; Be that the load meeting is quickened, thereby cause the generation of lifting accident.
At present, mainly prevent the pressure duct explosion through explosion relief valve is installed in pressure duct, this explosion relief valve can effectively stop the motor counter-rotating when the pressure duct explosion, thus not free fall of proof load.Explosion relief valve mainly comprises pilot operated directional control valve and inserted valve, and two main hydraulic fluid ports of inserted valve are communicated with the high pressure side oil outlet of Hydraulic Pump and the high pressure side oil inlet of motor respectively, and the control port of pilot operated directional control valve is communicated with pressure duct; The oil outlet of pilot operated directional control valve is communicated with the control chamber of inserted valve; Its groundwork principle is following: when hoisting load, the high pressure oil of pressure duct makes the pilot operated directional control valve transposition, at this moment; Inserted valve control chamber spring is open; Thereby make the inserted valve conducting, high pressure oil gets into motor, and motor can carry out work; When falling operation, pressure duct becomes the motor oil return line, proof load to fall, and then the pressure of high-pressure oil passage must guarantee to open pilot operated directional control valve, the conducting inserted valve, otherwise motor can be braked by explosion relief valve.Therefore, for the operating mode of whereabouts, pressure duct must have suitable pressure could guarantee normally carrying out of winch action, then when pressure duct pressure can not be pushed pilot operated directional control valve open, and the elevator operation of can not normally falling.In addition, this explosion relief valve price is higher, has increased production cost.
Therefore, how to provide that a kind of to have closed fhdraulic system more convenient to operate and the failure-free explosion protection be those skilled in the art's technical issues that need to address.
Summary of the invention
The object of the invention is for providing a kind of closed fhdraulic system, and the explosion protection in this closed fhdraulic system can pin motor when pressure duct generation explosion, prevent its counter-rotating, and simple in structure, dependable performance.Another object of the present invention provides a kind of hoisting crane that comprises above-mentioned closed fhdraulic system.
For solving the problems of the technologies described above; The present invention provides a kind of closed fhdraulic system; The Hydraulic Pump and the explosion protection that comprise motor, the said motor operations of driving; Said explosion protection comprises hydraulic control one-way valve, and said hydraulic control one-way valve is located on said Hydraulic Pump high pressure side oil outlet to the path of said motor high pressure side oil inlet; Said explosion protection also comprises first change-over valve; Said first change-over valve is located on the path of control port and said motor high pressure side oil inlet of said hydraulic control one-way valve; When said first change-over valve was in first control position, the control port of said hydraulic control one-way valve was communicated with fuel tank; When said first change-over valve was in second control position, said control port was communicated with said motor high pressure side oil inlet.
Preferably; Also comprise hoist brake; The repairing oil circuit of said Hydraulic Pump and the path of said hoist brake oil inlet are provided with second change-over valve, and when said second change-over valve was in first control position, the oil inlet of said hoist brake was communicated with said repairing oil circuit; When said second change-over valve was in second control position, the oil inlet of said hoist brake was communicated with said fuel tank.
Preferably; The path of said second change-over valve and said repairing oil circuit is provided with pilot operated directional control valve; The control end of said pilot operated directional control valve is communicated with the oil outlet of said Hydraulic Pump, and when said pilot operated directional control valve was in first control position, said repairing oil circuit was communicated with said second change-over valve; When said pilot operated directional control valve was in second control position, said second change-over valve was communicated with said fuel tank.
Preferably, said first change-over valve and said second change-over valve are two-position three way magnetic valve.
Preferably, said pilot operated directional control valve is the two-position three way pilot operated valve device.
Preferably, the path of said second change-over valve to said fuel tank is provided with check valve.
Preferably, the path of said first change-over valve and said motor high pressure side oil inlet is provided with damping port.
The explosion protection of closed fhdraulic system provided by the present invention comprises the hydraulic control one-way valve of being located on said Hydraulic Pump high pressure side oil outlet to the path of said motor high pressure side oil inlet; Also comprise first change-over valve on the path of the control port of being located at said hydraulic control one-way valve and said motor high pressure side oil inlet, when the pipelines from bursting of high pressure side, make first change-over valve be in first control position; Then the high pressure side oil inlet of the control port of hydraulic control one-way valve and motor breaks off; Hydraulic oil in the hydraulic control one-way valve guide control chamber is back to fuel tank, and guide's piston reset is to virgin state, and hydraulic control one-way valve only can be realized nonreturn flow; Hydraulic oil can't counter-flow; Hydraulic oil in the motor can't flow out, thereby pins motor, prevents the motor counter-rotating effectively.Explosion protection in this closed fhdraulic system adopts the hydraulic control one-way valve and first change-over valve, can be in the high pressure side during pipelines from bursting, pin motor effectively, and prevent the motor counter-rotating, dependable performance and simple in structure; In addition, when falling operation, make first change-over valve be in second control position; Then the control port of hydraulic control one-way valve is communicated with motor high pressure side oil inlet through first change-over valve; All the time have enough pressure and open hydraulic control one-way valve, realize the drop action of elevator, mode of operation is comparatively stable.
For reaching another object of the present invention, the present invention also provides a kind of hoisting crane, comprises the elevator that hoists, hoist motor and the closed fhdraulic system that drives said hoist motor, and said closed fhdraulic system is above-mentioned each described closed fhdraulic system.Because above-mentioned closed fhdraulic system has above-mentioned technique effect, the hoisting crane with this closed fhdraulic system also should have identical technique effect.
Description of drawings
Fig. 1 is the hydraulic system principle figure of a kind of specific embodiment of closed fhdraulic system provided by the present invention;
Fig. 2 is the hydraulic system principle figure of explosion protection in a kind of specific embodiment of closed fhdraulic system provided by the present invention.
The specific embodiment
Core of the present invention is for providing a kind of closed fhdraulic system, and the explosion protection of this closed fhdraulic system can pin motor when pressure duct generation explosion, prevent its counter-rotating, and simple in structure, dependable performance.Another core of the present invention provides a kind of hoisting crane that comprises above-mentioned closed fhdraulic system.
In order to make those skilled in the art understand technical scheme of the present invention better, the present invention is done further detailed description below in conjunction with accompanying drawing and specific embodiment.
Please refer to Fig. 1, Fig. 1 is a kind of specific embodiment hydraulic system principle figure of closed fhdraulic system provided by the present invention; Fig. 2 is the hydraulic system principle figure of explosion protection in a kind of specific embodiment of closed fhdraulic system provided by the present invention.
Closed fhdraulic system comprises the Hydraulic Pump A and the explosion protection of motor B, CD-ROM drive motor B work.Hydraulic Pump A CD-ROM drive motor B rotates to drive elevator and rotates, thus the folding and unfolding steel rope, the lifting and the whereabouts of realizing load; Explosion protection plays the effect of locked motor B when pressure duct generation explosion, prevent motor B counter-rotating.
Explosion protection in this embodiment comprises hydraulic control one-way valve 1, and hydraulic control one-way valve 1 is located at the high pressure side oil outlet of Hydraulic Pump A to the path of the high pressure side oil inlet of motor B, promptly is located among the pipeline A1 of high pressure side; When guide's control chamber of hydraulic control one-way valve 1 did not have the hydraulic oil entering, hydraulic control one-way valve 1 was not opened, and hydraulic oil only can flow to the high pressure side oil inlet of motor B from the high pressure side oil outlet of Hydraulic Pump A; And can not counter-flow; At this moment, on high-tension side hydraulic oil CD-ROM drive motor B rotation, then motor B drives the elevator operation under the effect of hydraulic oil; Drive load rises, and realizes the lifting operation of elevator.
Explosion protection also comprises the first change-over valve Y1; The first change-over valve Y1 is located on the path of control port and motor B high pressure side oil inlet of hydraulic control one-way valve 1; The first change-over valve Y1 has two control positioies at least, and when the first change-over valve Y1 was in first control position, the control port of hydraulic control one-way valve 1 was communicated with fuel tank; Can in explosion protection, be provided with and leak hydraulic fluid port L, then the control port of hydraulic control one-way valve 1 can be back to fuel tank through leaking hydraulic fluid port L; When the first change-over valve Y1 was in second control position, the control port of hydraulic control one-way valve 1 was communicated with motor B high pressure side oil inlet.As shown in Figure 1, when elevator fell operation, the low pressure side oil outlet of hydraulic oil self-hydraulic pump A got into the low pressure side oil inlet of motor B; CD-ROM drive motor B rotation, then hydraulic oil changes the high pressure side oil inlet over to from the low pressure side oil inlet of motor B, and flow to hydraulic control one-way valve 1; Simultaneously, a part of hydraulic oil also can flow to the first change-over valve Y1, makes the first change-over valve Y1 be in second control position; Then hydraulic oil is communicated with the control port of hydraulic control one-way valve 1, and hydraulic oil can get into guide's control chamber of hydraulic control one-way valve 1, and hydraulic oil is pushed the first guide piston of hydraulic control one-way valve 1 open; Thereby open hydraulic control one-way valve 1, at this moment, hydraulic oil can successfully be realized counter-flow; Be that hydraulic oil can flow to Hydraulic Pump A from the high pressure side of motor B oil inlet, then realized the whereabouts operation of elevator.
The first change-over valve Y1 can be a two-position three way magnetic valve; Be illustrated in figure 1 as the power failure state of the first change-over valve Y1; Promptly the first change-over valve Y1 is in first control position, and the control port of hydraulic control one-way valve 1 is communicated with fuel tank through leaking hydraulic fluid port L through position, the left side path of the first change-over valve Y1; When falling operation, make the first change-over valve Y1 be in electricity condition, then the first change-over valve Y1 is in second control position, the control port of the first change-over valve Y1 is communicated with the high pressure side oil inlet of motor B through the right position path of the first change-over valve Y1.The first change-over valve Y1 adopts two-position three way magnetic valve to be convenient to electric system control, realizes automation mechanized operation.
When the pipeline A1 explosion of high pressure side, make the first change-over valve Y1 be in first control position, when the first change-over valve Y1 is two-position three way magnetic valve; Make its outage, then the high pressure side oil inlet of the control port of hydraulic control one-way valve 1 and motor B breaks off, and the hydraulic oil in hydraulic control one-way valve 1 guide's control chamber is back to fuel tank; Guide's piston reset is to virgin state; Hydraulic control one-way valve 1 only can be realized nonreturn flow, and hydraulic oil can't counter-flow, and the hydraulic oil in the motor B can't flow out; Thereby pin motor B, prevent motor B counter-rotating effectively.
Explosion protection in this closed fhdraulic system adopts the hydraulic control one-way valve 1 and the first change-over valve Y1, can be in the high pressure side during pipeline A1 explosion, pin motor B effectively, and prevent motor B counter-rotating, dependable performance and simple in structure; In addition, the control port of hydraulic control one-way valve 1 is communicated with motor B high pressure side oil inlet through the first change-over valve Y1, when falling operation, has enough pressure all the time and opens hydraulic control one-way valve 1, and mode of operation is comparatively stable.
Closed fhdraulic system can comprise hoist brake C; Elevator is played locked effect; Explosion protection can also comprise the second change-over valve Y2, can the second change-over valve Y2 be arranged on the path of repairing oil circuit and hoist brake C oil inlet of Hydraulic Pump A, and the second change-over valve Y2 has two control positioies at least; When the second change-over valve Y2 was in first control position, the oil inlet of hoist brake C was communicated with the repairing oil circuit; When the second change-over valve Y2 was in second control position, the oil inlet of hoist brake C was communicated with fuel tank.
When elevator promotes operation; Make the second change-over valve Y2 be in first control position, hydraulic oil is pushed hoist brake C open from the oil inlet of repairing oil circuit entering hoist brake C; Elevator is realized release, thereby make elevator under the effect of hydraulic oil, carry out the lift heavy operation; When elevator falls operation, make the second change-over valve Y2 be in first control position equally, elevator is realized release, thereby make the elevator operation of under the effect of hydraulic oil, falling.When being in non-operating condition; Make the second change-over valve Y2 be in second control position, the oil inlet of hoist brake C and repairing oil circuit break off, and are communicated with fuel tank; Can be communicated with fuel tank through the leakage hydraulic fluid port L in the explosion protection equally; Then the hydraulic oil in the hoist brake C control chamber can be back to fuel tank, and hoist brake C closes, and pins elevator.Therefore, this system utilizes the hydraulic oil of repairing oil circuit can when operation, realize the opening and closing of hoist brake C automatically, need not to set up control cock in the outside of hoist brake C, has simplified the layout of pipeline, and has reduced the cost of system design.
The second change-over valve Y2 can be a two-position three way magnetic valve; The second change-over valve Y2 as shown in Figure 1 is in power failure state, promptly is in second control position, and the hydraulic oil in the hoist brake C leaks hydraulic fluid port L connection through the Zuo Weiyu of the second change-over valve Y2; And then being back to fuel tank, hoist brake C closes; During work, it is electric that the second change-over valve Y2 is got, and the hydraulic oil of repairing oil circuit can get into the oil inlet of hoist brake C from the right position of the second change-over valve Y2, opens hoist brake C.The second change-over valve Y2 adopts two-position three way magnetic valve to be convenient to electric system control, realizes automation mechanized operation.
Further; Explosion protection can comprise pilot operated directional control valve Y3; Pilot operated directional control valve Y3 can be arranged on the path of the second change-over valve Y2 and repairing oil circuit; The control end of pilot operated directional control valve Y3 is communicated with the high pressure side oil outlet of Hydraulic Pump A, and when pilot operated directional control valve Y3 was in first control position, the repairing oil circuit was communicated with the second change-over valve Y2; When pilot operated directional control valve Y3 was in second control position, the second change-over valve Y2 was communicated with fuel tank.As shown in Figure 1, pilot operated directional control valve Y3 can be the two-position three way pilot operated valve device, and no matter elevator promotes the operation of still falling; The hydraulic oil of high pressure side pipeline all can get into the control end of pilot operated directional control valve Y3; Push the control cock of pilot operated directional control valve Y3 open, make it be in first control position, promptly be in position, the left side path shown in Fig. 1; The hydraulic oil of repairing oil circuit gets into the oil inlet of the second change-over valve Y2 from pilot operated directional control valve Y3; Make the second change-over valve Y2 be in first control position simultaneously, then hydraulic oil can get into the oil inlet of hoist brake C, opens hoist brake C; When being in off working state, no hydraulic oil gets into the control end of pilot operated directional control valve Y3, and then pilot operated directional control valve Y3 resets and is in second control position; Promptly be in the right position path shown in Fig. 1, the second change-over valve Y2 is in second control position, position, a left side as shown in fig. 1; Then the oil inlet of hoist brake C is communicated with fuel tank through the second change-over valve Y2; Can pass through leakage hydraulic fluid port L equally and be communicated with fuel tank, the hydraulic oil in the hoist brake C control chamber is back to fuel tank, and then hoist brake C closes.
When the explosion phenomenon appearred in high pressure side pipeline A1, the pressure of high pressure side pipeline A1 can sharply fall to zero, reduced to zero with the pressure of pilot operated directional control valve Y3 control end bonded assembly oil circuit; The differential pressure of promptly pushing pilot operated directional control valve Y3 control cock open is to zero, and then pilot operated directional control valve Y3 will reset under the effect of spring, and promptly pilot operated directional control valve Y3 is in second control position; Be in right position path shown in Figure 1, at this moment, the second change-over valve Y2 still is in first control position; When the second change-over valve Y2 is under the situation of two-position three way magnetic valve; High pressure side pipeline A1 blow-out, the second change-over valve Y2 do not have enough time to cut off the power supply as yet, and promptly the second change-over valve Y2 still is in right position path; Then the hydraulic oil of hoist brake C the inside can be back to fuel tank through the right position of the second change-over valve Y2 and the right position of pilot operated directional control valve Y3; Hoist brake C closes, and then hoist brake C will locked immediately elevator, prevents motor B counter-rotating.
In fact being provided with of pilot operated directional control valve Y3 played further protective effect to elevator; Even when hydraulic control one-way valve 1 goes wrong; Also can pass through the locked elevator of mechanical mode; Be pilot operated directional control valve Y3 and hydraulic control one-way valve 1 all play protection to motor B effect, therefore, this explosion protection has the double shielding function.
When the second change-over valve Y2 was in second control position, the second change-over valve Y2 was provided with check valve 2 to the path of fuel tank, and promptly hydraulic oil only can flow to fuel tank from the second change-over valve Y2.The check valve 2 that on oil return line, is provided with can be made back pressure valve and use, and makes oil return produce back pressure.
Can also on the path of the first change-over valve Y1 and motor B high pressure side oil inlet, damping port 3 be set.Damping port 3 can play at a distance from the effect of pressing current limliting, thereby makes the path of path and the motor B and the first change-over valve Y1 of motor B and hydraulic control one-way valve 1 more stable.
Except above-mentioned closed fhdraulic system, the present invention also provides a kind of hoisting crane, comprises the elevator that hoists, hoist motor and the closed fhdraulic system that drives hoist motor, and closed fhdraulic system is above-mentioned each described closed fhdraulic system.Because above-mentioned closed fhdraulic system has above-mentioned technique effect, the hoisting crane with this closed fhdraulic system also should have the corresponding techniques effect, and all the other concrete embodiments are similar to the above embodiments, and this paper repeats no more.
More than a kind of hoisting crane provided by the present invention and closed system thereof have been carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle 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 claim of the present invention.
Claims (8)
1. a closed fhdraulic system comprises motor (B), drives Hydraulic Pump (A) and explosion protection that said motor (B) is worked, it is characterized in that,
Said explosion protection comprises hydraulic control one-way valve (1), and said hydraulic control one-way valve (1) is located on said Hydraulic Pump (A) high pressure side oil outlet to the path of said motor (B) high pressure side oil inlet;
Said explosion protection also comprises first change-over valve (Y1); Said first change-over valve (Y1) is located on the path of control port and said motor (B) high pressure side oil inlet of said hydraulic control one-way valve (1); When said first change-over valve (Y1) was in first control position, the control port of said hydraulic control one-way valve (1) was communicated with fuel tank; When said first change-over valve (Y1) was in second control position, said control port was communicated with said motor (B) high pressure side oil inlet.
2. closed fhdraulic system according to claim 1; It is characterized in that; Also comprise hoist brake (C); The path of the repairing oil circuit of said Hydraulic Pump (A) and said hoist brake (C) oil inlet is provided with second change-over valve (Y2), and when said second change-over valve (Y2) was in first control position, the oil inlet of said hoist brake (C) was communicated with said repairing oil circuit; When said second change-over valve (Y2) was in second control position, the oil inlet of said hoist brake (C) was communicated with said fuel tank.
3. closed fhdraulic system according to claim 2; It is characterized in that; Said second change-over valve (Y2) is provided with pilot operated directional control valve (Y3) with the path of said repairing oil circuit; The control end of said pilot operated directional control valve (Y3) is communicated with the oil outlet of said Hydraulic Pump (A), and when said pilot operated directional control valve (Y3) was in first control position, said repairing oil circuit was communicated with said second change-over valve (Y2); When said pilot operated directional control valve (Y3) was in second control position, said second change-over valve (Y2) was communicated with said fuel tank.
4. closed fhdraulic system according to claim 3 is characterized in that, said first change-over valve (Y1) and said second change-over valve (Y2) are two-position three way magnetic valve.
5. closed fhdraulic system according to claim 4 is characterized in that, said pilot operated directional control valve (Y3) is the two-position three way pilot operated valve device.
6. the closed fhdraulic system of stating according to claim 5 is characterized in that, the path of said second change-over valve (Y2) to said fuel tank is provided with check valve (2).
7. according to each described closed fhdraulic system of claim 1 to 6, it is characterized in that said first change-over valve (Y1) is provided with damping port (3) with the path of said motor (B) high pressure side oil inlet.
8. a hoisting crane comprises the elevator that hoists, hoist motor and the closed fhdraulic system that drives said hoist motor, it is characterized in that, said closed fhdraulic system is each described closed fhdraulic system of claim 1 to 7.
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| CN201110009311A CN102030267B (en) | 2011-01-17 | 2011-01-17 | Hoist and closed hydraulic system thereof |
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| CN201110009311A CN102030267B (en) | 2011-01-17 | 2011-01-17 | Hoist and closed hydraulic system thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102229416B (en) * | 2011-06-29 | 2013-06-05 | 三一汽车起重机械有限公司 | Closed-type rotary hydraulic system for crane and crane |
| CN102718162B (en) * | 2012-06-29 | 2014-12-17 | 上海三一科技有限公司 | Winch hydraulic system safety device and crane |
| CN102935985A (en) * | 2012-11-15 | 2013-02-20 | 江苏威和重工有限公司 | Route limiting stopper of hydraulic hoisting device |
| CN102963834B (en) * | 2012-11-15 | 2015-12-09 | 余小兵 | The stroke position limiting valve of hydraulic hoisting apparatus |
| CN102942118B (en) * | 2012-11-26 | 2014-12-17 | 中联重科股份有限公司 | Anti-stall control system and method for closed hoisting mechanism |
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| CN201942438U (en) * | 2011-01-17 | 2011-08-24 | 徐州重型机械有限公司 | Crane and closed type hydraulic system thereof |
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| JPH08217389A (en) * | 1995-02-15 | 1996-08-27 | Sumitomo Constr Mach Co Ltd | Hydraulic winch device |
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| JP2005214327A (en) * | 2004-01-30 | 2005-08-11 | Aichi Corp | Brake device of hydraulic motor |
| CN101537984A (en) * | 2009-04-21 | 2009-09-23 | 上海三一科技有限公司 | Hoist motor closed type hydraulic system for preventing pipelines from bursting and control method thereof |
| CN201433066Y (en) * | 2009-04-21 | 2010-03-31 | 上海三一科技有限公司 | Pipeline crack prevention closed type hydraulic system of winding motor |
| CN201942438U (en) * | 2011-01-17 | 2011-08-24 | 徐州重型机械有限公司 | Crane and closed type hydraulic system thereof |
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