CN102167261B - Crane and hydraulic control system of single-cylinder bolt type telescopic mechanism of crane - Google Patents

Crane and hydraulic control system of single-cylinder bolt type telescopic mechanism of crane Download PDF

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Publication number
CN102167261B
CN102167261B CN201010124830A CN201010124830A CN102167261B CN 102167261 B CN102167261 B CN 102167261B CN 201010124830 A CN201010124830 A CN 201010124830A CN 201010124830 A CN201010124830 A CN 201010124830A CN 102167261 B CN102167261 B CN 102167261B
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valve
control
fluid port
hydraulic fluid
communicated
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CN201010124830A
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Chinese (zh)
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CN102167261A (en
Inventor
单增海
刘邦才
徐尚国
周飞
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徐州重型机械有限公司
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Abstract

The invention discloses a hydraulic control system of a single-cylinder bolt type telescopic mechanism, which is used for controlling the extending and retracting operations of a telescopic cylinder. The hydraulic control system comprises a hydraulic pump, an oil tank, a direction control main valve and a pilot control valve, wherein the hydraulic pump is communicated with a pressure oilway; the oil tank is communicated with a first oil return oilway and a second oil return oilway; the direction control main valve is arranged between the telescopic cylinder and the pressure oilway, and the first oil return oilway so as to control liquid feeding of a rod cavity and a rodless cavity of the telescopic cylinder; an oil inlet of the pilot control valve is communicated with the pressure oilway, an oil return port of the pilot control valve is communicated with the second oil return oilway, and two oil control ports of the pilot control valve are respectively acted on two end parts of a valve core of the direction control main valve so as to control the working position and the opening of the direction control main valve. On that basis, the invention also provides a crane applying the hydraulic control system of the single-cylinder bolt type telescopic mechanism.

Description

Hoisting crane and single cylinder bolt-type telescoping mechanism hydraulic control system thereof
Technical field
The present invention relates to the hoisting crane technical field, be specifically related to a kind of hoisting crane and single cylinder bolt-type telescoping mechanism hydraulic control system thereof.
Background technology
Along with the continuous development of wheel crane technology, and the improving constantly of user's request, hoist boom of wheel crane is more and more longer, and joint arm number is also more and more.
At present, each saves the flexible of arm and mainly realizes through dual mode: the one, and multi-cylinder rope row formula telescoping mechanism, another is the single cylinder bolt-type telescoping mechanism.Receive the restriction of weight and spatial destribution, when the crane arm joint number was more than 5 joints, multi-cylinder rope row formula telescoping mechanism can not satisfy the demands; And adopting the single cylinder bolt-type telescoping mechanism can satisfy the flexible demand of single oil cylinder well, its telescopic oil cylinder ability actv. sequentially stretches out each joint arm or withdraws, thereby realizes the expanding-contracting action of crane arm.
Pump control single cylinder bolt-type telescopic system is adopted in the control of existing single cylinder bolt-type telescoping mechanism mostly; Can effectively control the flow of high-voltage oil liquid through pump control and inserted valve, effectively to avoid the causing a large amount of heat-producing problems of system owing to the flow of hydraulic efficiency pressure system is too high.Yet in the application of reality, pump control single cylinder bolt-type telescopic system has following weak point:
At first, the pump that this pump control system adopted all need be controlled specially, and system architecture is comparatively complicated, so cost is higher;
Secondly, receive the restriction of the special hydraulic circuit of this pump control system, it is slow that each saves the speed of response of arm expanding-contracting action, and then influence the complete machine performance.
In view of this, demand urgently being optimized design, to overcome the problems referred to above that prior art exists to the hydraulic control system of single cylinder bolt-type telescoping mechanism.
Summary of the invention
To above-mentioned defective, the technical matters that the present invention solves is, a kind of single cylinder bolt-type telescoping mechanism hydraulic control system of structure optimization is provided, with the speed of response of effective raising telescoping cylinder.On this basis, the present invention also provides the hoisting crane of this single cylinder bolt-type telescoping mechanism hydraulic control system of a kind of application.
Single cylinder bolt-type telescoping mechanism hydraulic control system provided by the invention is used to control stretching out and recovery operation of telescoping cylinder, and this hydraulic control system comprises Hydraulic Pump that is communicated with the pressure oil circuit and the fuel tank that is communicated with first oil return circuit and second oil return circuit; Also comprise direction control main valve and pilot-actuated valve; Wherein, said direction control main valve is arranged between telescoping cylinder and the pressure oil circuit and first oil return circuit, with the rodless cavity of controlling said telescoping cylinder and the feed liquor of rod chamber; The oil inlet of said pilot-actuated valve is communicated with the pressure oil circuit, and its return opening is communicated with second oil return circuit, and its two control ports act on the both ends of the spool of said direction control main valve respectively, to control control position, the aperture of said direction control main valve.
Preferably, said pilot-actuated valve is specially electronically controlled proportional valve.
Preferably, said Hydraulic Pump is specially load sensitive pump; And said direction control main valve is specially three pilot operated valve device; Wherein, when this valve is positioned at position, left side state, its oil inlet and first hydraulic fluid port and the 4th hydraulic fluid port conducting, its second hydraulic fluid port and return opening conducting, its 3rd hydraulic fluid port is non-conduction; This valve is positioned at the meta state, its second hydraulic fluid port and return opening conducting, and its oil inlet, first hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port are non-conduction; When this valve is positioned at right position state, its oil inlet and second hydraulic fluid port and the 3rd hydraulic fluid port conducting, its first hydraulic fluid port and return opening conducting, its 4th hydraulic fluid port is non-conduction; And said direction control main valve is in system; Its oil inlet is communicated with the pressure oil circuit; Its return opening is communicated with first oil return circuit; Its first hydraulic fluid port is communicated with the rodless cavity of said telescoping cylinder, and its second hydraulic fluid port is communicated with the rod chamber of said telescoping cylinder, and its 3rd hydraulic fluid port and the 4th hydraulic fluid port are communicated with the control port of said load sensitive pump respectively.
Preferably, also comprise first by pass valve and second by pass valve; Wherein, the inlet of said first by pass valve is communicated with the 3rd hydraulic fluid port of said direction control main valve, and its liquid outlet is communicated with second oil return circuit; The inlet of said second by pass valve is communicated with the 4th hydraulic fluid port of said direction control main valve, and its liquid outlet is communicated with second oil return circuit.
Preferably, also comprise first switch valve and the 3rd by pass valve and second switch valve and the 4th by pass valve; Wherein, Said first switch valve and the 3rd by pass valve are connected in series successively; And and said first by pass valve be parallel between the 3rd hydraulic fluid port and second oil return circuit of said direction control main valve, and the settling pressure of said the 3rd by pass valve is less than the settling pressure of first by pass valve; Said second switch valve and the 4th by pass valve are connected in series successively, and and said second by pass valve be parallel between the 4th hydraulic fluid port and second oil return circuit of said direction control main valve, and the settling pressure of said the 4th by pass valve is less than the settling pressure of second by pass valve.
Preferably, said first switch valve and said second switch valve are specially automatically controlled two position two-way valve.
Preferably; Also comprise first reducing valve and second reducing valve; Wherein, said first reducing valve is arranged on the pipeline between the inlet of pressure oil circuit and said pilot-actuated valve, and said second reducing valve is arranged on the pipeline between the oil inlet of pressure oil circuit and said direction control main valve.
Preferably, also comprise the 5th by pass valve, its inlet is communicated with the liquid outlet of said Hydraulic Pump, and its liquid outlet is communicated with first oil return circuit.
Preferably, said the 5th by pass valve is specially the guide and controls by pass valve.
Hoisting crane provided by the invention has telescopic hoist boom, and this telescopic hoist boom adopts the control of single cylinder bolt-type telescoping mechanism respectively to save the flexible of arm, also comprises foregoing single cylinder bolt-type telescoping mechanism hydraulic control system.
Hydraulic control system provided by the invention adopts the flexible operation of the telescoping cylinder of direction control main valve control single cylinder bolt-type telescoping mechanism, and utilizes the switch operation and the aperture size of this direction control main valve of pilot-actuated valve control.In the actual mechanical process, the operator controls the flow direction, the flow of pilot-actuated valve corrective action in guide's fluid of direction control main valve plug, and then controls control position, the aperture of direction control main valve reliably.Compared with prior art, hydraulic control system according to the invention has following beneficial effect:
At first, the native system structure design is simple, has abandoned the control element of existing pump control system complex, greatly reduces the complete machine cost; Simultaneously, two chamber feed liquor amounts of this programme direct control telescoping cylinder can be improved the speed of response of telescoping cylinder to greatest extent, thereby improve the complete machine performance.
Secondly; In preferred version of the present invention; Said Hydraulic Pump is specially load sensitive pump, through load pressure being drawn back the control end of Hydraulic Pump, makes the load pressure of Hydraulic Pump sensory perceptual system; And then the fluid of required pressure of output system and flow, in effectively energy-conservation, improved the efficient of hydraulic efficiency pressure system widely.
Once more, in another preferred version of the present invention, utilize the operation pressure that stretches out or regain of first by pass valve and second by pass valve control telescoping cylinder respectively, can be through preset different settling pressure, to improve the working stability of system.
The 4th, in another preferred version of the present invention, have additional two groups of multistage pressure controllable function, be respectively applied for telescoping cylinder and control in empty cylinder operational pressure.Because the settling pressure of the 3rd by pass valve is less than the settling pressure of first by pass valve, thereby after empty cylinder was stretched operating mode conducting first switch valve, the 3rd by pass valve worked; In like manner, the settling pressure of the 4th by pass valve is less than the settling pressure of second by pass valve, and after empty cylinder contracted operating mode conducting second switch valve, the 4th by pass valve worked.Like this, use different pressure in empty cylinder operation with band arm operation operating mode, thereby can realize the control of flexible pressure under the different operating modes preferably, reduced the compression shock and the cal val of system, and then guaranteed that system's operation is more steady.
Single cylinder bolt-type telescoping mechanism hydraulic control system provided by the invention is applicable to the hoisting crane of any tonnage, large-tonnage wheel crane in being specially adapted to.
Description of drawings
Fig. 1 is the fundamental diagram of the single cylinder bolt-type telescoping mechanism hydraulic control system of hoisting crane described in the specific embodiment;
Fig. 2 is the integral structure scheme drawing of hoisting crane described in the specific embodiment.
Among the figure:
Telescoping cylinder 1, Hydraulic Pump 2, fuel tank 3, direction control main valve 4, pilot-actuated valve 5, electromagnet 51, electromagnet 52, first by pass valve 6, second by pass valve 7, first switch valve 8, the 3rd by pass valve 9, second switch valve 10, the 4th by pass valve 11, first reducing valve 12, second reducing valve 13, the 5th by pass valve 14.
The specific embodiment
Core of the present invention is the optimal design that proposes to existing single cylinder bolt-type telescoping mechanism, with simplied system structure, improves the speed of response of telescoping cylinder.Specify this embodiment below in conjunction with Figure of description.
See also Fig. 1, this figure is the fundamental diagram of the said single cylinder bolt-type telescoping mechanism of this embodiment hydraulic control system.Identical with prior art, this hydraulic control system is accomplished the operation for the single cylinder bolt-type telescoping mechanism through stretching out with recovery operation of control telescoping cylinder 1.
As shown in the figure, the output oil port of Hydraulic Pump 2 is communicated with system pressure oil circuit P, and first oil return line T (system master's oil return line) and the second oil return circuit T1 (control oil return line) are communicated with respectively and take back to fuel tank 2; In the actual design, fuel tank 3 can be set to one or more according to practical application, to satisfy the needs of pipe-line layout.
Direction control main valve 4 is arranged between telescoping cylinder 1 and the pressure oil circuit P and the first oil return circuit T, with the rodless cavity of control telescoping cylinder 1 and the feed liquor of rod chamber; The oil inlet of pilot-actuated valve 5 is communicated with pressure oil circuit P; Its return opening is communicated with the second oil return circuit T1; Its two control ports act on the both ends of the spool of direction control main valve 4 respectively, with control position, the aperture of control direction control main valve 4, promptly; Its first control port is controlled chamber with the guide of direction control main valve 4 left ends and is communicated with, and its second control port is controlled chamber with the guide of direction control main valve 4 right-hand members and is communicated with.
As shown in the figure, these pilot-actuated valve 5 optional electronically controlled proportional valves of using.During concrete operations; Electromagnet 51 electric, electromagnet 52 dead electricity, then its first control port output guide guide of controlling fluid to direction control main valve 4 left ends controls chamber, makes direction control main valve 4 be positioned at position, left side mode of operation; Simultaneously; Through control electromagnet 51 electric currents, the aperture of control pilot-actuated valve 5, thus effectively control the oil inlet quantity that approach axis is controlled main valve 4 guide's oil pockets.Otherwise, electromagnet 52 electric, electromagnet 51 dead electricity, then its second control port output guide guide of controlling fluid to direction control main valve 4 right-hand members controls chamber.Because what of the oil inlet quantity of direction control main valve 4 guide's oil pockets, corresponding the aperture of direction control main valve 4, thus realized the control of 4 pairs of telescoping cylinders of direction control main valve, 1 turnover oil masses.
The specified delivery pressure of Hydraulic Pump, flow must satisfy the needs of maximum load operating mode, yet load pressure is all inequality under different operation operating modes, when load pressure relatively hour, must cause the degradation of energy of Hydraulic Pump.For this reason, the Hydraulic Pump 2 of this programme adopts load sensitive pump, and direction control main valve 4 is specially and is provided with three pilot operated valve device of load pressure feedback port.In system; The oil inlet of these three pilot operated valve device is communicated with pressure oil circuit P; Its return opening is communicated with the first oil return circuit T; Its first hydraulic fluid port is communicated with the rodless cavity of telescoping cylinder 1, and its second hydraulic fluid port is communicated with the rod chamber of telescoping cylinder 1, and its 3rd hydraulic fluid port and the 4th hydraulic fluid port are communicated with the control port of load sensitive pump respectively.
So design, when three pilot operated valve device are positioned at position, left side state, its oil inlet and first hydraulic fluid port and the 4th hydraulic fluid port conducting, its second hydraulic fluid port and return opening conducting, its 3rd hydraulic fluid port is non-conduction; Under this state, the fluid of pressure oil circuit P gets into the rodless cavity of telescoping cylinder 1, rod chamber oil return to the first oil return circuit T of telescoping cylinder 1, and meanwhile, this road load pressure fluid draws the control port that is back to load sensitive pump through the 4th hydraulic fluid port.When three pilot operated valve device are positioned at the meta state, its second hydraulic fluid port and return opening conducting, its oil inlet, first hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port are non-conduction; Under this state, the fluid of telescoping cylinder 1 rod chamber is communicated with the first oil return circuit T, to guarantee the stability of jib under the off working state.When three pilot operated valve device are positioned at right position state, its oil inlet and second hydraulic fluid port and the 3rd hydraulic fluid port conducting, its first hydraulic fluid port and return opening conducting, its 4th hydraulic fluid port is non-conduction; Under this state, the fluid of pressure oil circuit P gets into the rod chamber of telescoping cylinder 1, rodless cavity oil return to the first oil return circuit T of telescoping cylinder 1, and meanwhile, this road load pressure fluid draws the control port that is back to load sensitive pump through the 3rd hydraulic fluid port.Thus, make the load pressure of Hydraulic Pump sensory perceptual system, and then required pressure and the flow of output system, improved the efficient of hydraulic efficiency pressure system widely.
Need to prove that the return opening of direction control main valve 4 can be set to one, also can need be set to two based on valve body structure, and is as shown in the figure.The quantity qualification that should be appreciated that return opening should not influence the scope that the application asks for protection.
In addition; Change between the multiple operation operating modes such as telescoping cylinder 1 need be stretched at the band arm, empty cylinder stretches, is with arm to contract and empty cylinder contracts, obviously, each operating mode is used identical system pressure; Then in the switching process of band arm and empty cylinder, can cause the compression shock of system, and system's heating.Based on this problem, this programme also has additional the multistage pressure controllable function, is specifically cooperated by first by pass valve 6, second by pass valve 7, first switch valve 8, the 3rd by pass valve 9, second switch valve 10 and the 4th by pass valve 11 and realizes.
Wherein, the inlet of first by pass valve 6 is communicated with the 3rd hydraulic fluid port of direction control main valve 4, and its liquid outlet is communicated with the second oil return circuit T1; The inlet of second by pass valve 7 is communicated with the 4th hydraulic fluid port of direction control main valve 4, and its liquid outlet is communicated with the second oil return circuit T1.
Wherein, First switch valve 8 and the 3rd by pass valve 9 are connected in series successively; And and first by pass valve direction control main valve 4 be parallel between the 3rd hydraulic fluid port and the second oil return circuit T1 of direction control main valve 4, and the settling pressure of the 3rd by pass valve 9 is less than the settling pressure of first by pass valve 6; Second switch valve 10 and the 4th by pass valve 11 are connected in series successively, and and second by pass valve 7 be parallel between the 4th hydraulic fluid port and the second oil return circuit T1 of direction control main valve 4, and the settling pressure of the 4th by pass valve 11 is less than the settling pressure of second by pass valve 7.Under the normality, first switch valve 8 is in nonconducting state with second switch valve 10.Preferably, first switch valve 8 is specially automatically controlled two position two-way valve with second switch valve 10, to improve the operability of system.
In the actual mechanical process,,, control the working pressure that the band arms are stretched through second by pass valve 7 through the working pressure that first by pass valve, 6 control band arms contract in band arm operation operating mode.In empty cylinder operation operating mode; When operating mode was in the sky cylinder and contracts, the electromagnetic valve of first switch valve 8 must conduct, because the settling pressure of the 3rd by pass valve 9 is less than the settling pressure of first by pass valve 6; Thereby stretch operating mode the 3rd by pass valve 9 at empty cylinder and work, use less relatively pressure; When operating mode was in the sky cylinder and stretches, the electromagnetic valve of second switch valve 10 must conduct, and same, the settling pressure of the 4th by pass valve 11 is stretched operating mode the 4th by pass valve 11 at empty cylinder and worked less than the settling pressure of second by pass valve 7, uses less relatively pressure.So design makes and uses different pressure in empty cylinder operation with band arm operation operating mode, thereby can realize the control of flexible pressure under the different operating modes preferably, has reduced the compression shock and the cal val of system, and then has guaranteed that system's operation is more steady.
Special version be that from the valve body design point of view, aforementioned each valve that is used to realize multistage pressure control can be controlled main valve with direction and become one, and is beneficial to system pipeline and arranges.
In addition, on the pipeline between the inlet of pressure oil circuit P and pilot-actuated valve 5, be provided with first reducing valve 12, so that pressure oil circuit P adapts to the nominal working pressure of pilot-actuated valve 5.On the pipeline between the oil inlet of pressure oil circuit P and direction control main valve 4, be provided with second reducing valve 13 that plays the pressure compensation effect, constant with the front and back pressure reduction that guarantees direction control main valve 4.
Moreover, also being provided with the 5th by pass valve 14, its inlet is communicated with the liquid outlet of Hydraulic Pump 2, and its liquid outlet is communicated with the first oil return circuit T, to improve the security and stability of system.Preferably, the 5th by pass valve 14 is specially the guide and controls by pass valve, can reduce work and impact, and improves voltage regulation performance.
See also Fig. 2, the figure shows the integral structure scheme drawing of the said hoisting crane of this embodiment.
Main function components such as the chassis of this hoisting crane, winding plant, telescoping boom and engine installation and prior art are identical, should be appreciated that those of ordinary skill in the art can realize based on technology fully, so this paper repeats no more.This hoisting crane has telescopic hoist boom, and this telescopic hoist boom adopts the control of single cylinder bolt-type telescoping mechanism respectively to save the flexible of arm, adopts foregoing single cylinder bolt-type telescoping mechanism hydraulic control system.
The above only is a preferred implementation of the present invention; 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 make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (10)

1. single cylinder bolt-type telescoping mechanism hydraulic control system is used to control stretching out and recovery operation of telescoping cylinder, and this hydraulic control system comprises:
The Hydraulic Pump that is communicated with the pressure oil circuit; With
The fuel tank that is communicated with first oil return circuit and second oil return circuit; It is characterized in that, also comprise:
Direction control main valve is arranged between telescoping cylinder and pressure oil circuit and first oil return circuit, with the rodless cavity of controlling said telescoping cylinder and the feed liquor of rod chamber; With
Pilot-actuated valve, its oil inlet is communicated with the pressure oil circuit, and its return opening is communicated with second oil return circuit, and its two control ports act on the both ends of the spool of said direction control main valve respectively, to control control position, the aperture of said direction control main valve.
2. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 1 is characterized in that said pilot-actuated valve is specially electronically controlled proportional valve.
3. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 1 and 2 is characterized in that said Hydraulic Pump is specially load sensitive pump; And
Said direction control main valve is specially three pilot operated valve device; Wherein, when this valve is positioned at position, left side state, its oil inlet and first hydraulic fluid port and the 4th hydraulic fluid port conducting, its second hydraulic fluid port and return opening conducting, its 3rd hydraulic fluid port is non-conduction; This valve is positioned at the meta state, its second hydraulic fluid port and return opening conducting, and its oil inlet, first hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port are non-conduction; When this valve is positioned at right position state, its oil inlet and second hydraulic fluid port and the 3rd hydraulic fluid port conducting, its first hydraulic fluid port and return opening conducting, its 4th hydraulic fluid port is non-conduction; And
Said direction control main valve is in system; Its oil inlet is communicated with the pressure oil circuit; Its return opening is communicated with first oil return circuit; Its first hydraulic fluid port is communicated with the rodless cavity of said telescoping cylinder, and its second hydraulic fluid port is communicated with the rod chamber of said telescoping cylinder, and its 3rd hydraulic fluid port and the 4th hydraulic fluid port are communicated with the control port of said load sensitive pump respectively.
4. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 3 is characterized in that, also comprises:
First by pass valve, its inlet is communicated with the 3rd hydraulic fluid port of said direction control main valve, and its liquid outlet is communicated with second oil return circuit; With
Second by pass valve, its inlet is communicated with the 4th hydraulic fluid port of said direction control main valve, and its liquid outlet is communicated with second oil return circuit.
5. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 4 is characterized in that, also comprises:
First switch valve and the 3rd by pass valve, successively serial connection and and said first by pass valve be parallel between the 3rd hydraulic fluid port and second oil return circuit of said direction control main valve, and the settling pressure of said the 3rd by pass valve is less than the settling pressure of first by pass valve; With
Second switch valve and the 4th by pass valve, successively serial connection and and said second by pass valve be parallel between the 4th hydraulic fluid port and second oil return circuit of said direction control main valve, and the settling pressure of said the 4th by pass valve is less than the settling pressure of second by pass valve.
6. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 5 is characterized in that, said first switch valve and said second switch valve are specially automatically controlled two position two-way valve.
7. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 3 is characterized in that, also comprises:
First reducing valve is arranged on the pipeline between the inlet of pressure oil circuit and said pilot-actuated valve;
Second reducing valve is arranged on pressure oil circuit and said direction and controls on the pipeline between the oil inlet of main valve.
8. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 1 and 2 is characterized in that, also comprises:
The 5th by pass valve, its inlet is communicated with the liquid outlet of said Hydraulic Pump, and its liquid outlet is communicated with first oil return circuit.
9. single cylinder bolt-type telescoping mechanism hydraulic control system according to claim 8 is characterized in that said the 5th by pass valve is specially the guide and controls by pass valve.
10. hoisting crane has telescopic hoist boom, and this telescopic hoist boom adopts the control of single cylinder bolt-type telescoping mechanism respectively to save the flexible of arm, it is characterized in that, also comprises like each described single cylinder bolt-type telescoping mechanism hydraulic control system in the claim 1 to 9.
CN201010124830A 2010-02-26 2010-02-26 Crane and hydraulic control system of single-cylinder bolt type telescopic mechanism of crane CN102167261B (en)

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CN201010124830A CN102167261B (en) 2010-02-26 2010-02-26 Crane and hydraulic control system of single-cylinder bolt type telescopic mechanism of crane

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Application Number Priority Date Filing Date Title
CN201010124830A CN102167261B (en) 2010-02-26 2010-02-26 Crane and hydraulic control system of single-cylinder bolt type telescopic mechanism of crane

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CN102167261B true CN102167261B (en) 2012-10-10

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CN102583172A (en) * 2011-12-19 2012-07-18 徐州重型机械有限公司 Suspension arm telescopic hydraulic control system and crane with same
CN102431900B (en) * 2011-12-20 2013-07-17 中联重科股份有限公司 Control system of bolt mechanism and crane
CN102619794B (en) * 2012-03-28 2014-12-10 三一汽车起重机械有限公司 Single-cylinder bolt expansion and contraction control system and construction machine
CN103388598B (en) * 2013-08-06 2015-12-02 中联重科股份有限公司 Lazy arm telescopic mechanism and hydraulic control system thereof and controlling method, hoist
CN104370223B (en) * 2014-11-05 2016-06-29 徐州徐工随车起重机有限公司 Control the hydraulic control system of triplex sequential telescopic, suspension arm mechanism and crane
CN104444859B (en) * 2014-12-10 2017-01-04 徐州重型机械有限公司 Single-cylinder bolt oil cylinder anti-leak control method, device and single-cylinder bolt telescopic system
CN105197821B (en) * 2015-09-07 2017-03-01 徐州重型机械有限公司 Telescopic system and crane that the anti-core pipe of energy is emptied

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