CN104061199A - Crane, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof - Google Patents
Crane, single-cylinder bolt type telescopic boom and bolt mechanism hydraulic system thereof Download PDFInfo
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- CN104061199A CN104061199A CN201410303182.XA CN201410303182A CN104061199A CN 104061199 A CN104061199 A CN 104061199A CN 201410303182 A CN201410303182 A CN 201410303182A CN 104061199 A CN104061199 A CN 104061199A
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Abstract
The invention discloses a crane, a single-cylinder bolt type telescopic boom and a bolt mechanism hydraulic system thereof. The bolt mechanism hydraulic system comprises a bolt mechanism with cylinder-bolt oil cylinders and boom-bolt oil cylinders, a retractable core tube, a direction control valve bank and an energy accumulator; the retractable core tube is arranged on a telescopic oil cylinder of the single-cylinder bolt type telescopic boom, and the first end of the retractable core tube communicates with a hydraulic pump or an oil tank by means of the working position switching of a first direction control valve; both the cylinder-bolt oil cylinders and the boom-bolt oil cylinders are dual-acting oil cylinders; the direction control valve bank controls oil passage on-off between the second end of the retractable core tube and the rod or rodless chambers of the cylinder-bolt oil cylinders or the boom-bolt oil cylinders, and has a working position for the communication between an oil inlet and a return oil inlet; the liquid inlet of the energy accumulator communicates with the return oil inlet of the direction control valve bank. The bolt mechanism hydraulic system uses the energy accumulator as a buffering device for the unloading of the dual-acting oil cylinders, so that the dual-acting oil cylinders also can be driven by the single retractable core tube, and the bolt mechanism hydraulic system has a simple structure and high reliability.
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 that comprises above-mentioned single-cylinder bolt type telescopic boom.
Background technique
Bolt mechanism is the crucial power unit of 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, cylinder pin oil cylinder 1 ' and the arm pin oil cylinder 2 ' of bolt mechanism are one-way cylinder, in the rodless cavity of cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ', are provided with spring, and under normality, under the effect of 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, the first hydraulic fluid port of this telescopic core pipe 4 ' is switched and is communicated with oil outlet or the fuel tank of oil hydraulic pump by the working position of the first selector valve 5 ', the second hydraulic fluid port of this telescopic core pipe 4 ' separates two fuel feeding branch roads, be communicated with respectively the rod chamber of cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ', between fuel feeding branch road, be provided with and control the second selector valve 6 ' that hydraulic oil flows to described in second hydraulic fluid port and two of telescopic core pipe 4 '.
When release, switch the working position of the first selector valve 5 ', the 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 ', thereby make piston rod retraction control arm pin or the release of cylinder pin; When 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 effect of 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 can wear and tear, and affects the lock function of cylinder pin or arm pin, causes 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, there are certain requirements for the position of spring, and be subject to the restriction of minor details arm inner space, make troubles to the layout of spring.
For overcoming this problem, the scheme of often taking in prior art is for being made as two-way cylinder by cylinder pin oil cylinder 1 ' and arm pin oil cylinder 2 ', so needing two pipelines is two-way cylinder fuel feeding, can arrange in telescopic oil cylinder 3 ' outside the hose reel of two cores, 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 discharges or withdrawal flexible pipe, flexible pipe is full of after hydraulic oil, weight increases, can cause flexible pipe to sink, increase the layout difficulty of flexible pipe, and, flexible pipe is with easily damaging in the flexible process of telescopic oil cylinder 3 ', the same reliability that affects bolt mechanism.
Telescopic core pipe 4 ' can also be made as 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 it simple in structure, and reliability being 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, this hydraulic system simple in structure, and reliability is high.Another object of the present invention is to provide a kind of hoist that comprises 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 rod chamber or the rodless cavity of described cylinder pin oil cylinder, or oil circuit conducting between rod chamber or the rodless cavity of described arm pin oil cylinder, and described position control valve group has the working position that filler opening and return opening are communicated with;
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, simple in structure and reliability is high.Particularly, in this programme, cylinder pin oil cylinder and arm pin oil cylinder are all made as two-way cylinder, by the oil circuit on state between the second end of position control valve group control telescopic core pipe and rod chamber or the rodless cavity of cylinder pin oil cylinder or arm pin oil cylinder, and be provided with the accumulator being 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, when working state, pressure oil drives two-way cylinder action, and the hydraulic oil of low pressure oil pocket can flow to accumulator through the return opening of position control valve group, when off working state, hydraulic oil in accumulator can be by the off-load of position control valve group, thereby accumulator, as the damping device of two-way cylinder off-load, makes this hydraulic system that a telescopic core pipe is only set and also can meet the driving to two-way cylinder, not only simplify the structure of hydraulic system, also improved 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, the 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, the 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;
The first switch valve, controls the oil circuit conducting between described second direction control valve and rod chamber or the rodless cavity of described cylinder pin oil cylinder;
Second switch valve, controls the oil circuit conducting between described second direction control valve and rod chamber or the rodless cavity of described arm pin oil cylinder.
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, and in two equilibrium valves, the control port of one is communicated with the import of another one, and the control port of another one is communicated with the import of one.
Preferably, described the first switch valve and described second switch valve are normally closed solenoid valve.
Preferably, between described accumulator and the return opening of described position control valve group, be also provided with one-way balance valve.
The present invention also provides a kind of single-cylinder bolt type telescopic boom, comprises bolt mechanism and controls the hydraulic system that described bolt mechanism moves, and 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, comprise that the hoist of this single-cylinder bolt type telescopic boom also has identical technique effect.
Brief description of the drawings
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 ', the 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, the 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, this hydraulic system simple in structure, and reliability is high.Another core of the present invention is to provide a kind of hoist that comprises above-mentioned single-cylinder bolt type telescopic boom.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.For ease of understanding and describing succinctly, below describe 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, for the lock operation that stretches out of 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 used for storing hydraulic oil, and this oil hydraulic pump 80 is for exporting the hydraulic oil of 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 particularly the axle center of telescopic oil cylinder 30; The first end of this telescopic core pipe 40 is switched and is communicated with oil hydraulic pump 80 or fuel tank by the working position 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 its filler opening is communicated with oil hydraulic pump 80, the first end of telescopic core pipe 40 and oil hydraulic pump 80 conductings, 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, 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, when actual setting, first direction control valve 50 also can adopt other structural types, as long as can meet the conducting of corresponding oil circuit and the needs that nonconducting state switches.
This bolt mechanism hydraulic system also comprises position control valve group, the second end of this position control valve group control telescopic core pipe 40 and rod chamber or the rodless cavity of cylinder pin oil cylinder 10, or oil circuit conducting between rod chamber or the rodless cavity of arm pin oil cylinder 20, and this position control valve group has the working position that filler opening and return opening are communicated with; 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, the 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, the 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 and oil return inlet T 1 are communicated with.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, when actual setting, 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 second direction control valve 61 and rod chamber or the rodless cavity of cylinder pin oil cylinder 10; Second switch valve 63 is for controlling the oil circuit conducting between second direction control valve 61 and rod chamber or the rodless cavity of arm pin oil cylinder 20.
In concrete scheme, the first switch valve 62 and second switch valve 63 can adopt various structures form, all can as long as meet the needs that the conducting of corresponding oil circuit and nonconducting state switch; 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 stretching out state, and cylinder pin and arm pin are all in stretching 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 is through the second actuator port B1 of first direction control valve 50, telescopic core pipe 40, second direction control valve 61, the rod chamber that the first switch valve 62 inputs to cylinder pin oil cylinder 10, 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;
Drive cylinder pin to be retracted to behind target location until cylinder pin oil cylinder 10, 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, the state that second direction control valve 61 is communicated with in oil inlet P 1 and oil return inlet T 1, 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 is through the first actuator port A1 of first direction control valve 50, telescopic core pipe 40, second direction control valve 61, the rodless cavity that the first switch valve 62 inputs to cylinder pin oil cylinder 10, 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;
Drive cylinder pin to extend out to behind target location until cylinder pin oil cylinder 10, 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, the state that second direction control valve 61 is communicated with in oil inlet P 1 and oil return inlet T 1, 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;
Be with swing arm pin to be retracted to behind target location until arm pin oil cylinder 20, 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, the state that second direction control valve 61 is communicated with in oil inlet P 1 and oil return inlet T 1, 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;
Be with swing arm pin to extend out to behind target location until arm pin oil cylinder 10, 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, the state that now second direction control valve 61 is communicated with in oil inlet P 1 and oil return inlet T 1, 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, while making working state, the hydraulic oil of the low-pressure cavity of two-way cylinder can first flow into accumulator 70, make again afterwards the hydraulic oil of accumulator 70 flow back to fuel tank through telescopic core pipe 40, because accumulator 70 is as the damping device of two-way cylinder off-load, so only arranging a telescopic core pipe, this hydraulic system can meet the driving to two-way cylinder, so, not only simplify the structure of hydraulic system, also improved the reliability of hydraulic system.
Further, between accumulator 70 and the return opening of position control valve group, be also provided with one-way balance valve 71; Particularly, as shown in Figure 2, between accumulator 70 and the oil return inlet T 1 of second direction control valve 61, be provided with one-way balance valve 71, so, can make the certain pressure of the interior maintenance of 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 are in stretching out or when retracted state, all there is the possibility of improper change attitude, between two chambeies of cylinder pin oil cylinder 10, and it is after 90s between two chambeies of arm pin oil cylinder 20, hydraulic lock to be set, in stretching out or cylinder pin oil cylinder 10 and the arm pin oil cylinder 20 of retracted state there will not be abnormal action unstability, can remain on and need position, further improve the security and stability of hydraulic system.
As shown in Figure 3, the hydraulic lock 90 being arranged between two-way cylinder (comprising cylinder pin oil cylinder 10 and arm pin oil cylinder 20) is made up of two equilibrium valves, in two equilibrium valves, the control port of one and the import of another one are communicated with, and the control port of another one is communicated with the import of one.The structural type that should be appreciated that hydraulic lock 90 is not limited to shown in figure, all can as long as can realize the structure of above-mentioned functions.
It is pointed out that the hydraulic schematic diagram that only schematically shows a two-way cylinder in Fig. 3, so saved 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, also there is identical technique effect so there is the hoist of this single-cylinder bolt type telescopic boom, 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.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.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 improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (8)
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 switched and is communicated with oil hydraulic pump (80) or fuel tank by the working position 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 rod chamber or the rodless cavity of described cylinder pin oil cylinder (10), or oil circuit conducting between rod chamber or the rodless cavity of described arm pin oil cylinder (20), and described position control valve group has the working position that filler opening and return opening are communicated with;
Accumulator (70), its liquid entering hole is communicated with the return opening of described position control valve group.
2. bolt mechanism hydraulic system according to claim 1, is characterized in that, 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), the 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), the 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);
The first switch valve (62), controls the oil circuit conducting between described second direction control valve (61) and rod chamber or the rodless cavity of described cylinder pin oil cylinder (10);
Second switch valve (63), controls the oil circuit conducting between described second direction control valve (61) and rod chamber or the rodless cavity of described arm pin oil cylinder (20).
3. bolt mechanism hydraulic system according to claim 2, is characterized in that, between two chambeies of described cylinder pin oil cylinder (10), and between two chambeies of described arm pin oil cylinder (20), is equipped with hydraulic lock (90).
4. bolt mechanism hydraulic system according to claim 3, 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 is communicated with the import of another one, and the control port of another one is communicated with the import of one.
5. bolt mechanism hydraulic system according to claim 2, is characterized in that, described the first switch valve (62) and described second switch valve (63) are normally closed solenoid valve.
6. according to the bolt mechanism hydraulic system described in claim 1 to 5 any one, it is characterized in that, between described accumulator (70) and the return opening of described position control valve group, be also provided with one-way balance valve (71).
7. a single-cylinder bolt type telescopic boom, comprises bolt mechanism and controls the hydraulic system that described bolt mechanism moves, it is characterized in that, described hydraulic system is the bolt mechanism hydraulic system described in claim 1 to 6 any one.
8. 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 7.
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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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| CN106365055A (en) * | 2016-12-02 | 2017-02-01 | 徐州重型机械有限公司 | Plug-type extending-and-contracting system and lifting machine |
| CN108190762A (en) * | 2018-03-09 | 2018-06-22 | 徐州重型机械有限公司 | Single-cylinder bolt telescopic system and Work machine |
| CN110159362A (en) * | 2019-06-17 | 2019-08-23 | 南海发电一厂有限公司 | A kind of turbine by-pass control system |
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| CN105197821A (en) * | 2015-09-07 | 2015-12-30 | 徐州重型机械有限公司 | Telescopic system capable of preventing core tube from inhaling empty and crane |
| 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 |
| CN106365055A (en) * | 2016-12-02 | 2017-02-01 | 徐州重型机械有限公司 | Plug-type extending-and-contracting system and lifting machine |
| CN106365055B (en) * | 2016-12-02 | 2018-04-17 | 徐州重型机械有限公司 | Bolt-type telescopic system and hoisting machinery |
| CN108190762A (en) * | 2018-03-09 | 2018-06-22 | 徐州重型机械有限公司 | Single-cylinder bolt telescopic system and Work machine |
| 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 |
| CN110159362A (en) * | 2019-06-17 | 2019-08-23 | 南海发电一厂有限公司 | A kind of turbine by-pass control system |
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| CN104061199B (en) | 2016-04-27 |
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