CN104061199B - Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof - Google Patents
Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof Download PDFInfo
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- CN104061199B CN104061199B CN201410303182.XA CN201410303182A CN104061199B CN 104061199 B CN104061199 B CN 104061199B CN 201410303182 A CN201410303182 A CN 201410303182A CN 104061199 B CN104061199 B CN 104061199B
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Abstract
The invention discloses a kind of hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof, described bolt mechanism hydraulic system comprises the bolt mechanism with cylinder pin oil cylinder and arm pin oil cylinder; Telescopic core pipe, is located at the telescopic oil cylinder of described single-cylinder bolt type telescopic boom, and its first end is communicated with oil hydraulic pump or fuel tank by the working position switching of first direction control valve; Described cylinder pin oil cylinder and described arm pin oil cylinder are two-way cylinder; Also comprise position control valve group, control the second end of described telescopic core pipe and the rod chamber of described cylinder pin oil cylinder or rodless cavity, or the oil circuit conducting between the rod chamber of described arm pin oil cylinder or rodless cavity, and this position control valve group has the working position that filler opening is communicated with return opening; Accumulator, its liquid entering hole is communicated with the return opening of described position control valve group.This hydraulic system is using the damping device of accumulator as two-way cylinder off-load, and make to only have a telescopic core pipe also can drive two-way cylinder, the simple and reliable property of structure is high.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof.The invention still further relates to a kind of hoist comprising above-mentioned single-cylinder bolt type telescopic boom.
Background technique
Bolt mechanism is the crucial power unit realizing single-cylinder bolt type telescopic boom control.Please refer to Fig. 1, Fig. 1 is the hydraulic schematic diagram of bolt mechanism hydraulic system in prior art.
As shown in fig. 1, the cylinder pin oil cylinder 1 ' of bolt mechanism and arm pin oil cylinder 2 ' are one-way cylinder, and be provided with spring in the rodless cavity of cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ', under normality, under the action of the spring, cylinder pin and arm pin are and stretch out lock state; Hydraulic oil acts on the rod chamber of oil cylinder, for the withdrawal unlocking operation of control cylinder pin or arm pin.
The hydraulic oil channel of this bolt mechanism hydraulic system is for being arranged in the telescopic core pipe 4 ' in telescopic oil cylinder 3 ' axle center, first hydraulic fluid port of this telescopic core pipe 4 ' is communicated with the oil outlet of oil hydraulic pump or fuel tank by the working position switching of the first selector valve 5 ', second hydraulic fluid port of this telescopic core pipe 4 ' separates two fuel feeding branch roads, be communicated with the rod chamber of cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ' respectively, described in the second hydraulic fluid port of telescopic core pipe 4 ' and two, between fuel feeding branch road, be provided with the second selector valve 6 ' that hydraulic control oil flows to.
During unblock, switch the working position of the first selector valve 5 ', first hydraulic fluid port of telescopic core pipe 4 ' is communicated with the oil outlet of oil hydraulic pump, by the control of the second selector valve 6 ', make hydraulic oil act on the rod chamber of cylinder pin oil cylinder 1 ' or arm pin oil cylinder 2 ', piston rod is retracted thus control arm pin or the unblock of cylinder pin; During locking, switch the working position of the first selector valve 5 ', the first hydraulic fluid port of telescopic core pipe 4 ' is communicated with fuel tank, under the action of the spring, the piston reset of cylinder pin oil cylinder 1 ' or arm pin oil cylinder 2 ', now, telescopic core pipe 4 ' is as oil return circuit.
In working procedure, the spring of cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ' inevitably weares and teares, and affects the lock function of cylinder pin or arm pin, cause the reliability of single-cylinder bolt type telescopic boom and Security lower; And because cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ' are all by spring reset, the position for spring there are certain requirements, and is subject to the restriction of minor details arm inner space, makes troubles to the layout of spring.
For overcoming this problem, the scheme often taked in prior art is for being set to two-way cylinder by cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ', needs like this two pipelines are two-way cylinder fuel feeding, the hose reel of two cores can be arranged in telescopic oil cylinder 3 ' outside, for two-way cylinder fuel feeding, but, because flexible pipe is arranged in telescopic oil cylinder 3 ' outside, along with stretching of telescopic oil cylinder 3 ', hose reel release or withdrawal flexible pipe, after flexible pipe is full of hydraulic oil, weight increases, flexible pipe can be caused to sink, increase the layout difficulty of flexible pipe, and, flexible pipe easily damages with in the flexible process of telescopic oil cylinder 3 ', the same reliability affecting bolt mechanism.
Telescopic core pipe 4 ' can also be set to concentric bi-core pipe structure, be two-way cylinder fuel feeding.But concentric bi-core pipe structure causes core pipe oversize, technology difficulty is large, and processing cost is high.
In view of this, how to improve bolt mechanism hydraulic system, make its structure simple, and reliability is high, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof, the structure of this hydraulic system is simple, and reliability is high.Another object of the present invention is to provide a kind of hoist comprising above-mentioned single-cylinder bolt type telescopic boom.
For solving the problems of the technologies described above, the invention provides a kind of bolt mechanism hydraulic system, for single-cylinder bolt type telescopic boom, comprising:
There is the bolt mechanism of plugging pin oil cylinder and arm pin oil cylinder;
Telescopic core pipe, is located at the telescopic oil cylinder of described single-cylinder bolt type telescopic boom, and its first end is communicated with oil hydraulic pump or fuel tank by the working position switching of first direction control valve;
Described plugging pin oil cylinder and described arm pin oil cylinder are two-way cylinder;
Also comprise position control valve group, control the second end of described telescopic core pipe and the rod chamber of described cylinder pin oil cylinder or rodless cavity, or the oil circuit conducting between the rod chamber of described arm pin oil cylinder or rodless cavity, and described position control valve group has the working position that filler opening is communicated with return opening;
Accumulator, its liquid entering hole is communicated with the return opening of described position control valve group.
Bolt mechanism hydraulic system provided by the invention, the simple and reliable property of structure is high.Particularly, in this programme, cylinder pin oil cylinder and arm pin oil cylinder are all set to two-way cylinder, by the oil circuit on state between the second end of position control valve group control telescopic core pipe and the rod chamber of cylinder pin oil cylinder or arm pin oil cylinder or rodless cavity, and be provided with the accumulator be communicated with the return opening of position control valve group, and position control valve group has the working position that filler opening is communicated with return opening; So, during working state, pressure oil drives two-way cylinder action, and the hydraulic oil of low pressure oil pocket can flow to accumulator, during off working state through the return opening of position control valve group, hydraulic oil in accumulator is by the off-load of position control valve group, thus accumulator, as the damping device of two-way cylinder off-load, makes this hydraulic system only arrange a telescopic core pipe and also can meet driving to two-way cylinder, not only simplify the structure of hydraulic system, also improve the reliability of hydraulic system.
Preferably, described position control valve group comprises:
Second direction control valve, its filler opening is communicated with the second end of described telescopic core pipe, first actuator port is communicated with the rodless cavity of described cylinder pin oil cylinder or the rodless cavity of described arm pin oil cylinder, second actuator port is communicated with the rod chamber of described cylinder pin oil cylinder or the rod chamber of described arm pin oil cylinder, and return opening is communicated with the liquid entering hole of described accumulator;
First switch valve, controls the oil circuit conducting between the rod chamber of described second direction control valve and described cylinder pin oil cylinder or rodless cavity;
Second switch valve, controls the oil circuit conducting between the rod chamber of described second direction control valve and described arm pin oil cylinder or rodless cavity.
Preferably, between two chambeies of described cylinder pin oil cylinder, and be equipped with hydraulic lock between two chambeies of described arm pin oil cylinder.
Preferably, described hydraulic lock is made up of two equilibrium valves, in two equilibrium valves, and the control port of one and the inlet communication of another one, the control port of another one and the inlet communication of one.
Preferably, described first switch valve and described second switch valve are normally closed solenoid valve.
Preferably, also one-way balance valve is provided with between the return opening of described accumulator and described position control valve group.
The present invention also provides a kind of single-cylinder bolt type telescopic boom, and comprise the hydraulic system of bolt mechanism and the described bolt mechanism action of control, described hydraulic system is the bolt mechanism hydraulic system described in above-mentioned any one.
Because above-mentioned hydraulic system has above-mentioned technique effect, the single-cylinder bolt type telescopic boom with this hydraulic system also has identical technique effect.
The present invention also provides a kind of hoist, comprises single-cylinder bolt type telescopic boom described above.
Because above-mentioned single-cylinder bolt type telescopic boom has above-mentioned technique effect, the hoist comprising this single-cylinder bolt type telescopic boom also has identical technique effect.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of bolt mechanism hydraulic system in prior art;
Fig. 2 is the hydraulic schematic diagram of a kind of embodiment of bolt mechanism hydraulic system provided by the present invention;
Fig. 3 shows the hydraulic schematic diagram of a two-way cylinder in specific embodiment.
In Fig. 1:
Cylinder pin oil cylinder 1 ', arm pin oil cylinder 2 ', telescopic oil cylinder 3 ', telescopic core pipe 4 ', first selector valve 5 ', the second selector valve 6 ';
In Fig. 2-3:
Cylinder pin oil cylinder 10, arm pin oil cylinder 20, telescopic oil cylinder 30, telescopic core pipe 40, first direction control valve 50, second direction control valve 61, first switch valve 62, second switch valve 63, accumulator 70, one-way balance valve 71, oil hydraulic pump 80, hydraulic lock 90.
Embodiment
Core of the present invention is to provide a kind of single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof, and the structure of this hydraulic system is simple, and reliability is high.Another core of the present invention is to provide a kind of hoist comprising above-mentioned single-cylinder bolt type telescopic boom.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.For ease of understanding and describing succinct, be hereafter described in conjunction with single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof, beneficial effect no longer repeats to discuss.
Please refer to Fig. 2, Fig. 2 is the hydraulic schematic diagram of a kind of embodiment of bolt mechanism hydraulic system provided by the present invention.
The bolt mechanism of single-cylinder bolt type telescopic boom comprises cylinder pin oil cylinder 10 and arm pin oil cylinder 20, and in this embodiment, cylinder pin oil cylinder 10 and arm pin oil cylinder 20 are two-way cylinder.
As shown in Figure 2, when pressure oil acts on the rodless cavity of two-way cylinder, stretch out lock operation for control cylinder pin or arm pin, when pressure oil acts on the rod chamber of two-way cylinder, for the withdrawal unlocking operation of control cylinder pin or arm pin.
This bolt mechanism hydraulic system comprises fuel tank and oil hydraulic pump 80, and this fuel tank is for storing hydraulic oil, and this oil hydraulic pump 80 is for exporting the hydraulic oil in fuel tank to system pressure oil circuit.
This bolt mechanism hydraulic system has a telescopic core pipe 40, and it is located at the telescopic oil cylinder 30 of single-cylinder bolt type telescopic boom, can be located at the axle center of telescopic oil cylinder 30 particularly; The first end of this telescopic core pipe 40 is communicated with oil hydraulic pump 80 or fuel tank by the working position switching of first direction control valve 50.
In concrete scheme, first direction control valve 50 can be set to two-bit triplet solenoid valve, as shown in Figure 2, automatically controls with adaptive system.As Fig. 2, the Y1 of this two-bit triplet solenoid valve obtains electric, and namely its filler opening is communicated with oil hydraulic pump 80, the first end of telescopic core pipe 40 and oil hydraulic pump 80 conducting, and telescopic core pipe 40, as system pressure oil circuit, is cylinder pin oil cylinder 10 or arm pin oil cylinder 20 fuel feeding; This two-bit triplet solenoid valve dead electricity, namely its filler opening is communicated with fuel tank, and the first end of telescopic core pipe 40 and fuel tank conducting, as oil return circuit.Certainly, actual when arranging first direction control valve 50 also can adopt other structural types, as long as the needs that the conducting of corresponding oil circuit and nonconducting state switch can be met.
This bolt mechanism hydraulic system also comprises position control valve group, this position control valve group controls the second end of telescopic core pipe 40 and the rod chamber of cylinder pin oil cylinder 10 or rodless cavity, or the oil circuit conducting between the rod chamber of arm pin oil cylinder 20 or rodless cavity, and this position control valve group has the working position that filler opening is communicated with return opening; Also comprise accumulator 70, its liquid entering hole is communicated with the return opening of position control valve group.
In concrete scheme, described position control valve group comprises second direction control valve 61, its oil inlet P 1 is communicated with the second end of telescopic core pipe 40, first actuator port A1 is communicated with the rodless cavity of cylinder pin oil cylinder 10 or the rodless cavity of arm pin oil cylinder 20, second actuator port B1 is communicated with the rod chamber of cylinder pin oil cylinder 10 or the rod chamber of arm pin oil cylinder 20, oil return inlet T 1 is communicated with the liquid entering hole of accumulator 70, and second direction control valve 61 has the working position that oil inlet P 1 is communicated with oil return inlet T 1.This second direction control valve 61 can be set to three position four-way electromagnetic valve, and its Median Function is M type, as shown in Figure 2.Certainly, actual when arranging, second direction control valve 61 also can adopt other structural types, as long as can meet corresponding demand.
Described position control valve group also comprises the first switch valve 62 and second switch valve 63, and wherein, the first switch valve 62 is for controlling the oil circuit conducting between the rod chamber of second direction control valve 61 and cylinder pin oil cylinder 10 or rodless cavity; Second switch valve 63 is for controlling the oil circuit conducting between the rod chamber of second direction control valve 61 and arm pin oil cylinder 20 or rodless cavity.
In concrete scheme, the first switch valve 62 and second switch valve 63 can adopt various structures form, as long as meet the conducting of corresponding oil circuit and the needs of nonconducting state switching; Such as, the first switch valve 62 and second switch valve 63 all may be selected to be normally closed solenoid valve, automatically control reliably to realize system.
The control procedure of this bolt mechanism hydraulic system is summarized as follows:
Under normality, cylinder pin oil cylinder 10 and arm pin oil cylinder 20 are all in the state of stretching out, and namely cylinder pin and arm pin are all in and stretch out lock state.
Cylinder pin recovery operation: the Y1 of first direction control valve 50 obtains electric, the Y4a of second direction control valve 61 obtains electric, and the Y2 of the first switch valve 62 obtains electric; Pressure oil inputs to the rod chamber of cylinder pin oil cylinder 10 through the second actuator port B1 of first direction control valve 50, telescopic core pipe 40, second direction control valve 61, the first switch valve 62, the fluid of the rodless cavity of cylinder pin oil cylinder 10 flows into accumulator 70 through the first switch valve 62, second direction control valve 61, and cylinder pin oil cylinder 10 drives cylinder pin to regain;
After cylinder pin oil cylinder 10 drives cylinder pin to be retracted to target location, make the Y1 dead electricity of first direction control valve 50, the Y4a dead electricity of second direction control valve 61, the Y2 dead electricity of the first switch valve 62, now, second direction control valve 61 is in the state that oil inlet P 1 is communicated with oil return inlet T 1, and the fluid of accumulator 70 flows back to fuel tank through telescopic core pipe 40.
Cylinder pin stretches out operation: the Y1 of first direction control valve 50 obtains electric, and the Y4b of second direction control valve 61 obtains electric, and the Y2 of the first switch valve 62 obtains electric; Pressure oil inputs to the rodless cavity of cylinder pin oil cylinder 10 through the first actuator port A1 of first direction control valve 50, telescopic core pipe 40, second direction control valve 61, the first switch valve 62, the fluid of the rod chamber of cylinder pin oil cylinder 10 flows into accumulator 70 through the first switch valve 62, second direction control valve 61, and cylinder pin oil cylinder 10 drives cylinder pin to stretch out;
After cylinder pin oil cylinder 10 drives cylinder pin to extend out to target location, make the Y1 dead electricity of first direction control valve 50, the Y4b dead electricity of second direction control valve 61, the Y2 dead electricity of the first switch valve 62, now, second direction control valve 61 is in the state that oil inlet P 1 is communicated with oil return inlet T 1, and the fluid of accumulator 70 flows back to fuel tank through telescopic core pipe 40.
Arm pin recovery operation: the Y1 of first direction control valve 50 obtains electric, the Y4a of second direction control valve 61 obtains electric, and the Y3 of second switch valve 63 obtains electric; Pressure oil inputs to the rod chamber of arm pin oil cylinder 20 through first direction control valve 50, telescopic core pipe 40, the second actuator port B1 of second direction control valve 61, second switch valve 63, the fluid of the rodless cavity of arm pin oil cylinder 20 flows into accumulator 70 through second switch valve 63, second direction control valve 61, and arm pin oil cylinder 20 is with swing arm pin to regain;
After arm pin oil cylinder 20 is with swing arm pin to be retracted to target location, make the Y1 dead electricity of first direction control valve 50, the Y4a dead electricity of second direction control valve 61, the Y3 dead electricity of second switch valve 63, now, second direction control valve 61 is in the state that oil inlet P 1 is communicated with oil return inlet T 1, and the fluid of accumulator 70 flows back to fuel tank through telescopic core pipe 40.
Arm pin stretches out operation: the Y1 of first direction control valve 50 obtains electric, and the Y4b of second direction control valve 61 obtains electric, and the Y3 of second switch valve 63 obtains electric; Pressure oil inputs to the rodless cavity of arm pin oil cylinder 20 through first direction control valve 50, telescopic core pipe 40, the first actuator port A1 of second direction control valve 61, second switch valve 63, the fluid of the rod chamber of arm pin oil cylinder 20 flows into accumulator 70 through second switch valve 63, second direction control valve 61, and arm pin oil cylinder 20 is with swing arm pin to stretch out;
After arm pin oil cylinder 10 is with swing arm pin to extend out to target location, make the Y1 dead electricity of first direction control valve 50, the Y4b dead electricity of second direction control valve 61, the Y3 dead electricity of second switch valve 63, now second direction control valve 61 is in the state that oil inlet P 1 is communicated with oil return inlet T 1, and the fluid of accumulator 70 flows back to fuel tank through telescopic core pipe 40.
Compared with background technique, cylinder pin oil cylinder 10 and arm pin oil cylinder 20 are all set to two-way cylinder by bolt mechanism hydraulic system provided by the invention, and by the setting of position control valve group and accumulator 70, when making working state, the hydraulic oil of the low-pressure cavity of two-way cylinder can first flow into accumulator 70, the hydraulic oil of accumulator 70 is made to flow back to fuel tank through telescopic core pipe 40 afterwards again, because accumulator 70 is as the damping device of two-way cylinder off-load, so this hydraulic system only arranges a telescopic core pipe can meet driving to two-way cylinder, so, not only simplify the structure of hydraulic system, also improve the reliability of hydraulic system.
Further, one-way balance valve 71 is also provided with between the return opening of accumulator 70 and position control valve group; Particularly, as shown in Figure 2, between the oil return inlet T 1 of accumulator 70 and second direction control valve 61, be provided with one-way balance valve 71, so, can make to keep certain pressure in accumulator 70, avoid damaged.
Further, between two chambeies of cylinder pin oil cylinder 10, and be equipped with hydraulic lock 90 between two chambeies of arm pin oil cylinder 20.
Cylinder pin oil cylinder 10 and arm pin oil cylinder 20 be in stretch out or retracted state time, all there is the possibility of improper change attitude, between two chambeies of cylinder pin oil cylinder 10, and it is after 90s to arrange hydraulic lock between two chambeies of arm pin oil cylinder 20, be in and stretch out or the cylinder pin oil cylinder 10 of retracted state and arm pin oil cylinder 20 there will not be abnormal action unstability, can remain on and need position, further increase the security and stability of hydraulic system.
As shown in Figure 3, the hydraulic lock 90 be arranged between two-way cylinder (comprising cylinder pin oil cylinder 10 and arm pin oil cylinder 20) is made up of two equilibrium valves, the control port of one and the inlet communication of another one, the control port of another one and the inlet communication of one in two equilibrium valves.Should be appreciated that the structural type of hydraulic lock 90 is not limited to shown in figure, as long as the structure of above-mentioned functions can be realized.
It is pointed out that in Fig. 3 the hydraulic schematic diagram that schematically show only a two-way cylinder, so eliminate the setting of switch valve in figure, should be appreciated that those skilled in the art can apply it to bolt mechanism hydraulic system on this basis.
Except above-mentioned single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof, the present invention also provides a kind of hoist, comprises single-cylinder bolt type telescopic boom, and described single-cylinder bolt type telescopic boom is the single-cylinder bolt type telescopic boom described in above-mentioned any one.
Because above-mentioned single-cylinder bolt type telescopic boom has above-mentioned technique effect, so the hoist with this single-cylinder bolt type telescopic boom also has identical technique effect, repeat no more here.
Above hoist provided by the present invention, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof are all described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (7)
1. a bolt mechanism hydraulic system, for single-cylinder bolt type telescopic boom, comprising:
There is the bolt mechanism of cylinder pin oil cylinder (10) and arm pin oil cylinder (20);
Telescopic core pipe (40), is located at the telescopic oil cylinder (30) of described single-cylinder bolt type telescopic boom, and its first end is communicated with oil hydraulic pump (80) or fuel tank by the working position switching of first direction control valve (50);
It is characterized in that, described cylinder pin oil cylinder (10) and described arm pin oil cylinder (20) are two-way cylinder;
Also comprise position control valve group, control the second end of described telescopic core pipe (40) and the rod chamber of described cylinder pin oil cylinder (10) or rodless cavity, or the oil circuit conducting between the rod chamber of described arm pin oil cylinder (20) or rodless cavity, and described position control valve group has the working position that filler opening is communicated with return opening;
Accumulator (70), its liquid entering hole is communicated with the return opening of described position control valve group;
Described position control valve group comprises:
Second direction control valve (61), its filler opening (P1) is communicated with the second end of described telescopic core pipe (40), first actuator port (A1) is communicated with the rodless cavity of described cylinder pin oil cylinder (10) or the rodless cavity of described arm pin oil cylinder (20), second actuator port (B1) is communicated with the rod chamber of described cylinder pin oil cylinder (10) or the rod chamber of described arm pin oil cylinder (20), and return opening (T1) is communicated with the liquid entering hole of described accumulator (70);
First switch valve (62), controls the oil circuit conducting between the rod chamber of described second direction control valve (61) and described cylinder pin oil cylinder (10) or rodless cavity;
Second switch valve (63), controls the oil circuit conducting between the rod chamber of described second direction control valve (61) and described arm pin oil cylinder (20) or rodless cavity.
2. bolt mechanism hydraulic system according to claim 1, is characterized in that, between two chambeies of described cylinder pin oil cylinder (10), and is equipped with hydraulic lock (90) between two chambeies of described arm pin oil cylinder (20).
3. bolt mechanism hydraulic system according to claim 2, it is characterized in that, described hydraulic lock (90) is made up of two equilibrium valves, in two equilibrium valves, the control port of one and the inlet communication of another one, the control port of another one and the inlet communication of one.
4. bolt mechanism hydraulic system according to claim 1, is characterized in that, described first switch valve (62) and described second switch valve (63) are normally closed solenoid valve.
5. the bolt mechanism hydraulic system according to any one of Claims 1-4, is characterized in that, is also provided with one-way balance valve (71) between the return opening of described accumulator (70) and described position control valve group.
6. a single-cylinder bolt type telescopic boom, comprise the hydraulic system of bolt mechanism and the described bolt mechanism action of control, it is characterized in that, described hydraulic system is the bolt mechanism hydraulic system described in any one of claim 1 to 5.
7. a hoist, comprises single-cylinder bolt type telescopic boom, it is characterized in that, described single-cylinder bolt type telescopic boom is single-cylinder bolt type telescopic boom described in claim 6.
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| CN201410303182.XA CN104061199B (en) | 2014-06-27 | 2014-06-27 | Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof |
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| CN201410303182.XA CN104061199B (en) | 2014-06-27 | 2014-06-27 | Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104773653B (en) * | 2015-04-08 | 2017-03-15 | 徐州重型机械有限公司 | A kind of crane single cylinder bolt telescopic control method, system and contilever structure |
| 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 |
| CN106365055B (en) * | 2016-12-02 | 2018-04-17 | 徐州重型机械有限公司 | Bolt-type telescopic system and hoisting machinery |
| CN108190762B (en) * | 2018-03-09 | 2019-08-16 | 徐州重型机械有限公司 | Single-cylinder bolt telescopic system and Work machine |
| CN110159362B (en) * | 2019-06-17 | 2022-04-05 | 南海发电一厂有限公司 | Steam turbine bypass control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201284197Y (en) * | 2008-10-15 | 2009-08-05 | 徐州重型机械有限公司 | Telescopic arm plug pin mechanism control system |
| KR100990328B1 (en) * | 2010-04-13 | 2010-10-29 | 이점수 | Telescopic boom crane with oil-free slide plates type |
| 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 |
| CN102774760B (en) * | 2012-08-01 | 2014-09-24 | 徐州重型机械有限公司 | Control method for pulling arm bushing out of crane single cylinder bolt system |
| CN103438034B (en) * | 2013-09-03 | 2016-04-27 | 徐州重型机械有限公司 | The hydraulic system of single-cylinder bolt type telescopic boom and controlling method, hoist |
| CN204003684U (en) * | 2014-06-27 | 2014-12-10 | 徐州重型机械有限公司 | Hoist, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof |
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