CN104071709B - A kind of crane controls system and crane with the fixing stepless luffing of auxiliary - Google Patents
A kind of crane controls system and crane with the fixing stepless luffing of auxiliary Download PDFInfo
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- CN104071709B CN104071709B CN201410345980.9A CN201410345980A CN104071709B CN 104071709 B CN104071709 B CN 104071709B CN 201410345980 A CN201410345980 A CN 201410345980A CN 104071709 B CN104071709 B CN 104071709B
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Abstract
The present invention relates to a kind of crane and control system and crane with the fixing stepless luffing of auxiliary, control system includes electricity proportional pressure-reducing valve, variable pump, the first reversal valve and for making the hydraulic jack of fixing auxiliary luffing；On first reversal valve oil circuit between variable pump and hydraulic jack, the pressure oil of variable pump output is through the first reversal valve input hydraulic pressure oil cylinder, the discharge capacity of the pressure oil output of electricity proportional pressure-relief valve control variable pump.Crane provided by the invention controls system with the stepless luffing of fixing auxiliary and utilizes electricity proportional pressure-reducing valve to realize control variable pumpage, it is achieved the consecutive variations of variable pump discharge capacity, speed adjustable range is wide, and fretting performance is good.
Description
Technical field
The present invention relates to engineering machinery field, be specifically related to a kind of crane and control system and crane with the fixing stepless luffing of auxiliary.
Background technology
On modern crane tool, along with the increase of tonnage, boom reach and weight also in continuous lengthening, therefore fixing auxiliary becomes the important tool lengthening boom reach.And the fixing auxiliary of routine may only realize the change of 0 °, 15 ° and 30 ° amplitude, when running into the space that eminence is narrow, will be unable to realize lifting, final give user installation in place bring difficult and dangerous greatly.
Electricity proportional pressure-reducing valve can flexible utilization current signal, by change size of current, and then realize electricity proportional pressure-reducing valve output pressure change along with curent change.
The existing stepless changing-breadth system of fixing auxiliary is the oil pump utilizing fixed displacement to hydraulic system fuel feeding, and hydraulic oil passes through electromagnetic valve and balanced valve, the final stepless luffing promoting hydraulic jack to realize fixing auxiliary.
The existing stepless changing-breadth system of fixing auxiliary has the disadvantages that 1, oil pump capacity is fixed, and speed adjustable range is narrower, and fretting performance is poor；2, system pressure sets low, and cylinder sizes is big, and lift heavy performance is low；3, without oil cylinder pressurizer, it is impossible to prevent from releasing existing danger in oil cylinder.
Summary of the invention
The present invention provides a kind of crane to control system and crane with the fixing stepless luffing of auxiliary, and the main purpose of the present invention is the stepless luffing of stepless speed regulation and the fixing auxiliary angle realizing hydraulic jack.
For achieving the above object, the invention provides techniques below scheme:
A kind of crane controls system with the fixing stepless luffing of auxiliary, including electricity proportional pressure-reducing valve, variable pump, the first reversal valve and for making the hydraulic jack of fixing auxiliary luffing；
On first reversal valve oil circuit between variable pump and hydraulic jack, the pressure oil of variable pump output is through the first reversal valve input hydraulic pressure oil cylinder, the discharge capacity of the pressure oil output of electricity proportional pressure-relief valve control variable pump.
According to one embodiment of present invention, further, the oil-in of the first reversal valve connects with the oil-out of variable pump, oil return opening connects with fuel tank, the first actuator port connects with the rodless cavity of hydraulic jack, the second actuator port connects with the rod chamber of hydraulic jack.
According to one embodiment of present invention, further, control system also includes the second reversal valve, on second reversal valve oil circuit between variable pump and the first reversal valve；
Second reversal valve is bi-bit bi-pass solenoid directional control valve, and the oil-in of the second reversal valve connects with the oil-out of variable pump, the connection of the oil-in of the first actuator port and the first reversal valve.
According to one embodiment of present invention, further, control system also includes reel, on reel oil circuit between the first reversal valve and hydraulic jack.
According to one embodiment of present invention, further, control system also includes balanced valve, and the oil-in of balanced valve and the second actuator port connection of the first reversal valve, oil-out connect with the rod chamber of hydraulic jack.
According to one embodiment of present invention, further, control system also includes one-way throttle valve, first actuator port of the first hydraulic fluid port respectively with the first reversal valve of one-way throttle valve, balanced valve control port connect, the second hydraulic fluid port connects with the rodless cavity of hydraulic jack.
According to one embodiment of present invention, further, control system also includes accumulator, Pressure gauge and the 3rd check valve, accumulator connects with the rod chamber of hydraulic jack, the oil-in of the 3rd check valve connects with accumulator, oil-out connects with the rod chamber of hydraulic jack, on Pressure gauge oil circuit between accumulator and the rod chamber of hydraulic jack.
According to one embodiment of present invention, further, control system also includes the 3rd reversal valve and the 5th check valve, and the 3rd reversal valve and the 5th check valve are sequentially located on the oil circuit between accumulator and the first actuator port of the first reversal valve.
According to one embodiment of present invention, further, control system also includes the 6th check valve and the 4th reversal valve, and the 6th check valve and the 4th reversal valve are sequentially located on the oil circuit between the first actuator port of the first reversal valve and the second actuator port of the first reversal valve.
Present invention also offers techniques below scheme:
A kind of crane, crane includes crane as above and controls system with the fixing stepless luffing of auxiliary.
Based on any technology scheme in technique scheme, the embodiment of the present invention at least can produce following technique effect:
Electricity proportional pressure-reducing valve, variable pump, the first reversal valve and for making the hydraulic jack of fixing auxiliary luffing is included owing to crane provided by the present invention controls system with the stepless luffing of fixing auxiliary；On first reversal valve oil circuit between variable pump and hydraulic jack, the pressure oil of variable pump output is through the first reversal valve input hydraulic pressure oil cylinder, the discharge capacity of the pressure oil output of electricity proportional pressure-relief valve control variable pump, electricity proportional pressure-reducing valve is utilized to realize control variable pumpage, realize the consecutive variations of variable pump discharge capacity, speed adjustable range is wide, and fretting performance is good.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the hydraulic schematic diagram that the crane of the present invention controls the first embodiment of system with the fixing stepless luffing of auxiliary；
Fig. 2 is the hydraulic schematic diagram that the crane of the present invention controls the second embodiment of system with the fixing stepless luffing of auxiliary；
Fig. 3 is the hydraulic schematic diagram that the crane of the present invention controls the 3rd embodiment of system with the fixing stepless luffing of auxiliary.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
It should be understood that any technical characteristic in the present embodiment, any technical scheme is all one or more in the technical characteristic of plurality of optional or optional technical scheme, cannot all alternative technical characteristic of the exhaustive present invention and alternative technical scheme in order to describe succinct need in presents, also the embodiment being not easy to each technical characteristic all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: any technical characteristic and any technical scheme in the present embodiment are all not intended to protection scope of the present invention, protection scope of the present invention should include those skilled in the art and not pay the thinkable any alternate embodiments of creative work.
Hereafter in order to describe conveniently, hereinafter alleged "left", "right", " on ", left and right, the upper and lower of D score and accompanying drawing itself is to consistent.
As it is shown in figure 1, the invention provides a kind of crane stepless luffing of fixing auxiliary to control the first embodiment of system, including electricity proportional pressure-reducing valve 20, variable pump the 21, first reversal valve 4 and for making the hydraulic jack 13 of fixing auxiliary luffing；
On first reversal valve 4 oil circuit between variable pump 21 and hydraulic jack 13, the pressure oil of variable pump 21 output is through the first reversal valve 4 input hydraulic pressure oil cylinder 13, the discharge capacity of the pressure oil output of electricity proportional pressure-reducing valve 20 control variable pump 21.
The operation principle that this crane controls system with the fixing stepless luffing of auxiliary is: control the electric current of electricity proportional pressure-reducing valve, thus controlling the output pressure of electricity proportional pressure-reducing valve, and then control variable pump delivery size, it is achieved the stepless speed regulation of hydraulic jack and the stepless luffing of fixing auxiliary angle.
The work process that this crane controls system with the fixing stepless luffing of auxiliary is: the electric current of electricity proportional pressure-reducing valve increases, and the output pressure of electricity proportional pressure-reducing valve also increases, and the swash plate rotational angle of variable pump becomes big, and variable pump delivery also increases.
In one particular embodiment of the present invention, the curent change of electricity proportional pressure-reducing valve drives the piston rod of piston cylinder to stretch, and the piston rod of piston cylinder stretches and drives the swash plate of variable pump to rotate, and the swash plate of variable pump rotates the displacement variation driving variable pump.
In one particular embodiment of the present invention, the electric current of electricity proportional pressure-reducing valve 20 increases, and the rodless cavity oil-feed of first piston cylinder 1, the piston rod of first piston cylinder 1 moves right；The rodless cavity oil return of the second piston cylinder 2, the piston rod of the second piston cylinder 2 is moved to the left；The swash plate rotational angle of variable pump 21 becomes big, and the discharge capacity of variable pump 21 also increases.
In one particular embodiment of the present invention, the inside of the rodless cavity of first piston cylinder 1 has spring, spring connects bottom and the piston rod of rodless cavity, when the rodless cavity oil return of first piston cylinder 1, spring can make the piston rod of first piston cylinder 1 be moved to the left, and namely spring is that the piston rod for first piston cylinder 1 resets.
The electric current of electricity proportional pressure-reducing valve 20 increases the rodless cavity oil return realizing the rodless cavity oil-feed of first piston cylinder 1, the second piston cylinder 2, can be obtained by the oil communication relation of valve body and first piston cylinder the 1, second piston cylinder 2, this oil communication relation is prior art, herein not reinflated description.
Variable pump can be high-pressure plunger variable pump, and high-pressure plunger variable pump, as oil sources, improves system pressure, reduces hydraulic jack and respectively controls valve, line size, improves fixing auxiliary lift heavy performance.
In one particular embodiment of the present invention, the first reversal valve 4 can be three-position four-way electromagnetic directional valve, and middle position slide valve function is P type；
The oil-in of the first reversal valve 4 connects with the oil-out of variable pump 21, oil return opening connects with fuel tank, the first actuator port connects with the rodless cavity of hydraulic jack 13, the second actuator port connects with the rod chamber of hydraulic jack 13.
First reversal valve 4 has three kinds of operating positions, is left position, middle position and right position respectively；When the first reversal valve 4 is in left position, oil-in and the connection of the second actuator port, oil return opening and the first actuator port connect；When the first reversal valve 4 is in middle position, oil-in ends, and oil return opening respectively with the first actuator port, the second actuator port connect；When the first reversal valve 4 is in right position, oil-in and the connection of the first actuator port, oil return opening and the second actuator port connect.
In one particular embodiment of the present invention, control system can also include the second reversal valve 3, on second reversal valve 3 oil circuit between variable pump 21 and the first reversal valve 4；
Second reversal valve 3 is bi-bit bi-pass solenoid directional control valve, and the oil-in of the second reversal valve 3 connects with the oil-out of variable pump 21, the connection of the oil-in of the first actuator port and the first reversal valve 4.
Second reversal valve 3 has two kinds of operating positions, is left position and right position respectively；When the second reversal valve 3 is in left position, oil-in and the first actuator port connect；When the second reversal valve 3 is in right position, oil-in and the first actuator port do not connect.
When fixing auxiliary rises, increase along with handle electric current, electricity proportional pressure-reducing valve 20 electric current increases, variable pump 21 discharge capacity increases continuously, second reversal valve 3, the first left position of reversal valve 4 obtains electric, second reversal valve 3, first reversal valve 4 is all in left position, the hydraulic oil of variable pump 21 output is through the oil-in of the second reversal valve 3 and the first actuator port, the oil-in of the first reversal valve 4 and the second actuator port are to the rod chamber of hydraulic jack 13, the hydraulic oil of the rodless cavity of hydraulic jack 13 is through the first actuator port of the first reversal valve 4 and oil return opening to fuel tank, realize the contracting of hydraulic jack 13.
When fixing auxiliary falls, increase along with handle electric current, electricity proportional pressure-reducing valve 20 electric current increases, variable pump 21 discharge capacity increases continuously, the second left position of reversal valve 3 obtains electric, the first right position of reversal valve 4 obtains electric, second reversal valve 3 is in left position, first reversal valve 4 is in right position, the hydraulic oil of variable pump 21 output is through the oil-in of the second reversal valve 3 and the first actuator port, the oil-in of the first reversal valve 4 and the first actuator port are to the rodless cavity of hydraulic jack 13, the hydraulic oil of the rod chamber of hydraulic jack 13 is through the second actuator port of the first reversal valve 4 and oil return opening to fuel tank, realize stretching of hydraulic jack 13.
In one particular embodiment of the present invention, control system can also include the first check valve 22 and the second check valve 23, first check valve 22 and the second check valve 23 are arranged in parallel, the oil-in of the first check valve 22 connects with fuel tank, the connection of the oil return opening of oil-out and the first reversal valve 4, and the oil-in of the second check valve 23 and the oil return opening connection of the first reversal valve 4, oil-out connect with fuel tank.
In one particular embodiment of the present invention, control system can also include the first overflow valve 5, and the oil-in of the first overflow valve 5 and the first actuator port connection of the first reversal valve 4, oil return opening connect with fuel tank.
In one particular embodiment of the present invention, control system can also include the second overflow valve 6, and the oil-in of the second overflow valve 6 and the second actuator port connection of the first reversal valve 4, oil return opening connect with fuel tank.
In one particular embodiment of the present invention, control system can also include reel 7, on the reel 7 oil circuit between the first reversal valve 4 and hydraulic jack 13.
In one particular embodiment of the present invention, control system can also include balanced valve 15, and the oil-in of balanced valve 15 and the second actuator port connection of the first reversal valve 4, oil-out connect with the rod chamber of hydraulic jack 13.
Balanced valve 15 includes check valve and choke valve, and the oil-in of check valve and the second actuator port connection of the first reversal valve 4, oil-out connect with the rod chamber of hydraulic jack 13；The oil-in of choke valve connects with the rod chamber of hydraulic jack 13, the second actuator port connection of oil-out and the first reversal valve 4；When balanced valve 15 is in check valve position, the second actuator port of the first reversal valve 4 passes through check valve to the rod chamber oil-feed of hydraulic jack 13, it is achieved the contracting of hydraulic jack 13；When balanced valve 15 is in throttle valve position, the rod chamber of hydraulic jack 13 gives the second actuator port oil return of the first reversal valve 4 by choke valve, it is achieved stretching of hydraulic jack 13.
In one particular embodiment of the present invention, control system can also include one-way throttle valve 14, first actuator port of the first hydraulic fluid port respectively with the first reversal valve 4 of one-way throttle valve 14, balanced valve 15 control port connect, the second hydraulic fluid port connects with the rodless cavity of hydraulic jack 13.
One-way throttle valve 14 includes check valve and damping, and the oil-in of check valve connects with the rodless cavity of hydraulic jack 13, the control port connection of oil-out and the first actuator port of the first reversal valve 4, balanced valve 15；First hydraulic fluid port of damping connect with the rodless cavity of hydraulic jack 13, the first actuator port of the second hydraulic fluid port and the first reversal valve 4 connects；When the first actuator port of the first reversal valve 4 is by damping the rodless cavity oil-feed to hydraulic jack 13, first actuator port of the first reversal valve 4 balances the control port oil supply of valve 15 simultaneously, balanced valve 15 is made to be in throttle valve position, the rod chamber of hydraulic jack 13 gives the second actuator port oil return of the first reversal valve 4 by choke valve, it is achieved stretching of hydraulic jack 13；When hydraulic jack 13 rodless cavity by check valve give the first reversal valve 4 the first actuator port oil return time, the first actuator port oil return of the first reversal valve 4 is given in the control port of balanced valve 15 simultaneously, balanced valve 15 is made to be in check valve position, second actuator port of the first reversal valve 4 passes through check valve to the rod chamber oil-feed of hydraulic jack 13, it is achieved the contracting of hydraulic jack 13.
One-way throttle valve 14 can improve the control mouth pressure of balanced valve 15, makes the debugging scope of balanced valve reduce, and fixing auxiliary can either be kept steadily to rise, can play again the effect of debugging.
In one particular embodiment of the present invention, control system can also include accumulator 10, Pressure gauge 11 and the 3rd check valve 16, accumulator 10 connects with the rod chamber of hydraulic jack 13, the oil-in of the 3rd check valve 16 connects with accumulator 10, oil-out connects with the rod chamber of hydraulic jack 13, on the Pressure gauge 11 oil circuit between the rod chamber of accumulator 10 and hydraulic jack 13.
Pressure gauge 11 is used for measuring respectively the pressure of the rod chamber of accumulator 10 and hydraulic jack 13.
In one particular embodiment of the present invention, control system can also include the 4th check valve 17, and the oil-in of the 4th check valve 17 and the second actuator port connection of the first reversal valve 4, oil-out connect with accumulator 10.
In one particular embodiment of the present invention, control system can also include the 3rd reversal valve 9 and the 5th check valve 18, and the 3rd reversal valve 9 and the 5th check valve 18 are sequentially located on the oil circuit between accumulator 10 and the first actuator port of the first reversal valve 4.
In one particular embodiment of the present invention, 3rd reversal valve 9 can be bi-bit bi-pass hand-operated direction valve, the oil-in of the 3rd reversal valve 9 connects with accumulator 10, the connection of the oil-in of the first actuator port and the 5th check valve 18, the oil-out of the 5th check valve 18 and the first actuator port connection of the first reversal valve 4.
3rd reversal valve 9 has two kinds of operating positions, is upper and the next respectively；When the 3rd reversal valve 9 is in upper, oil-in and the first actuator port connect；When the second reversal valve 3 is in bottom, oil-in and the first actuator port do not connect.
When fixing auxiliary rises, increase along with handle electric current, electricity proportional pressure-reducing valve 20 electric current increases, variable pump 21 discharge capacity increases continuously, the second left position of reversal valve the 3, first reversal valve 4 obtains electric, second reversal valve the 3, first reversal valve 4 is all in left position, 3rd reversal valve 9 is in upper, the hydraulic oil of accumulator 10 is through the oil-in of the 3rd reversal valve 9 and the first actuator port, the oil-in of the 5th check valve 18 and oil-out, the first actuator port of the first reversal valve 4 and oil return opening to fuel tank, it is achieved the decompression function of accumulator 10.
In one particular embodiment of the present invention, control system can also include the 3rd overflow valve 12, and the oil-in of the 3rd overflow valve 12 connects with the rod chamber of hydraulic jack 13, the connection of the oil-in of oil return opening and the 5th check valve 18.
In one particular embodiment of the present invention, control system can also include the 6th check valve 19 and the 4th reversal valve 8, and the 6th check valve 19 and the 4th reversal valve 8 are sequentially located on the oil circuit between the first actuator port of the first reversal valve 4 and the second actuator port of the first reversal valve 4.
In one particular embodiment of the present invention, 4th reversal valve 8 can be bi-bit bi-pass hand-operated direction valve, the oil-in connection of the oil-in of the 6th check valve 19 and the first actuator port connection of the first reversal valve 4, oil-out and the 4th reversal valve 8, the first actuator port of the 4th reversal valve 8 and the second actuator port connection of the first reversal valve 4.
4th reversal valve 8 has two kinds of operating positions, is upper and the next respectively；When the 4th reversal valve 8 is in upper, oil-in and the first actuator port do not connect；When the 4th reversal valve 8 is in bottom, oil-in and the first actuator port connect.
nullFirst reversal valve 4 must not electricity，First reversal valve 4 is in middle position，4th reversal valve 8 is in bottom，Hydraulic oil one tunnel of the hydraulic oil of the rodless cavity of hydraulic jack 13 and the control port of balanced valve 15 is through the first actuator port of the first reversal valve 4 and oil return opening to fuel tank，Another road of hydraulic oil of the hydraulic oil of the rodless cavity of hydraulic jack 13 and the control port of balanced valve 15 is through the oil-in of the 6th check valve 19 and oil-out、The oil-in of the 4th reversal valve 8 and the first actuator port、Second actuator port of the first reversal valve 4 and oil return opening are to fuel tank，Namely the hydraulic oil of the control port of the hydraulic oil of the rodless cavity of hydraulic jack 13 and balanced valve 15 can pass through two-way oil circuit oil sump tank，Realize handle and return the quick pressure releasing of the rodless cavity of hydraulic jack 13 during middle position，The quick draining of hydraulic oil of the control port of balanced valve 15，Make balanced valve quick closedown、It is in check valve position.
This crane controls system with the fixing stepless luffing of auxiliary, and the 6th check valve the 19, the 4th reversal valve the 8, the 5th check valve the 18, the 3rd reversal valve the 9, the 3rd overflow valve 12 constitutes hydraulic jack pressurizer, it is therefore prevented that let out the danger brought in hydraulic jack.
As shown in Figure 2, present invention also offers a kind of crane and control the second embodiment of system with the fixing stepless luffing of auxiliary, the difference of the second embodiment and first embodiment is: changing the oil-in position of the 3rd overflow valve 12 and add the 4th overflow valve 24, all the other positions of the second embodiment are identical with first embodiment.
Particularly as follows: the oil-in of the 3rd overflow valve 12 connects with accumulator 10, the connection of the oil-in of oil return opening and the 5th check valve 18；Control system also includes the 4th overflow valve 24, and the oil-in of the 4th overflow valve 24 connects with the rod chamber of hydraulic jack 13, the first actuator port connection of oil return opening and the first reversal valve 4.
4th overflow valve 24 can individually prevent hydraulic jack detonation from occurring.
As shown in Figure 3, present invention also offers a kind of crane and control the 3rd embodiment of system with the fixing stepless luffing of auxiliary, the difference of the 3rd embodiment and the second embodiment is: balanced valve 15 is changed to the 7th check valve 25, and all the other positions of the 3rd embodiment are identical with the second embodiment.
Particularly as follows: control system can also include the 7th check valve 25, the oil-in of the 7th check valve 25 and the second actuator port connection of the first reversal valve 4, oil-out connect with the rod chamber of hydraulic jack 13.
Present invention also offers a kind of crane, the crane that crane includes as above controls system with the fixing stepless luffing of auxiliary.
The other parts of crane are referred to prior art, herein not reinflated description.
Any technology scheme disclosed in the invention described above is unless otherwise stated, if it discloses numerical range, so disclosed numerical range is preferred numerical range, any it should be appreciated by those skilled in the art: preferred numerical range is only the numerical value that in many enforceable numerical value, technique effect is obvious or representative.Owing to numerical value is more, it is impossible to exhaustive, so the present invention just discloses component values to illustrate technical scheme, and, the above-mentioned numerical value enumerated should not constitute the restriction to the invention protection domain.
If being used herein the word such as " first ", " second " to limit parts, those skilled in the art should know: the use of " first ", " second " is intended merely to facilitate in description and parts carries out difference as not having outside Stated otherwise, and above-mentioned word does not have special implication.
Simultaneously, if the invention described above discloses or relate to parts or the structural member of connection fastened to each other, so, unless otherwise stated, fixing connection is it is to be understood that connection (such as using bolt or screw to connect) can releasably be fixed, it can be appreciated that: non-removable fixing connection (such as riveted joint, welding), certainly, connection fastened to each other can also be integral type structure (such as use casting technique is integrally formed create) replaced (substantially cannot adopt except integrally formed technique).
It addition, term its implication unless otherwise stated for representing position relationship or shape applied in any technology scheme disclosed in the invention described above includes approximate with it, similar or close state or shape.Either component provided by the invention both can be assembled by multiple independent ingredients, it is also possible to the produced separate part of the technique that is one of the forming.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit；Although the present invention being described in detail with reference to preferred embodiment, those of ordinary skill in the field are it is understood that still can modify to the specific embodiment of the present invention or portion of techniques feature carries out equivalent replacement；Without deviating from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention is claimed.
Claims (9)
1. a crane controls system with the fixing stepless luffing of auxiliary, it is characterised in that
Including: electricity proportional pressure-reducing valve, variable pump, the first reversal valve and for making the hydraulic jack of fixing auxiliary luffing；
On described first reversal valve oil circuit between described variable pump and described hydraulic jack, the pressure oil of described variable pump output inputs described hydraulic jack through described first reversal valve, the discharge capacity of the pressure oil output of variable pump described in described electricity proportional pressure-relief valve control；
Described control system also includes accumulator, Pressure gauge and the 3rd check valve, accumulator connects with the rod chamber of hydraulic jack, the oil-in of the 3rd check valve connects with accumulator, oil-out connects with the rod chamber of hydraulic jack, on Pressure gauge oil circuit between accumulator and the rod chamber of hydraulic jack.
2. control system according to claim 1, it is characterised in that
The oil-in of the first reversal valve connects with the oil-out of variable pump, oil return opening connects with fuel tank, the first actuator port connects with the rodless cavity of hydraulic jack, the second actuator port connects with the rod chamber of hydraulic jack.
3. control system according to claim 1 and 2, it is characterised in that
Described control system also includes the second reversal valve, on second reversal valve oil circuit between variable pump and the first reversal valve；
Second reversal valve is bi-bit bi-pass solenoid directional control valve, and the oil-in of the second reversal valve connects with the oil-out of variable pump, the connection of the oil-in of the first actuator port and the first reversal valve.
4. control system according to claim 1 and 2, it is characterised in that
Described control system also includes reel, on reel oil circuit between the first reversal valve and hydraulic jack.
5. control system according to claim 2, it is characterised in that
Described control system also includes balanced valve, and the oil-in of balanced valve and the second actuator port connection of the first reversal valve, oil-out connect with the rod chamber of hydraulic jack.
6. control system according to claim 5, it is characterised in that
Described control system also includes one-way throttle valve, first actuator port of the first hydraulic fluid port respectively with the first reversal valve of one-way throttle valve, balanced valve control port connect, the second hydraulic fluid port connects with the rodless cavity of hydraulic jack.
7. control system according to claim 1, it is characterised in that
Described control system also includes the 3rd reversal valve and the 5th check valve, and the 3rd reversal valve and the 5th check valve are sequentially located on the oil circuit between accumulator and the first actuator port of the first reversal valve.
8. control system according to claim 1 and 2, it is characterised in that
Described control system also includes the 6th check valve and the 4th reversal valve, and the 6th check valve and the 4th reversal valve are sequentially located on the oil circuit between the first actuator port of the first reversal valve and the second actuator port of the first reversal valve.
9. a crane, it is characterised in that the crane that described crane includes described in any one of claim 1-8 controls system with the fixing stepless luffing of auxiliary.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410345980.9A CN104071709B (en) | 2014-07-18 | 2014-07-18 | A kind of crane controls system and crane with the fixing stepless luffing of auxiliary |
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| CN201410345980.9A CN104071709B (en) | 2014-07-18 | 2014-07-18 | A kind of crane controls system and crane with the fixing stepless luffing of auxiliary |
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| CN105179356B (en) * | 2015-08-27 | 2017-05-24 | 徐州重型机械有限公司 | Auxiliary boom control valve, auxiliary boom hydraulic control system and crane |
| CN106006416B (en) * | 2016-07-07 | 2018-06-26 | 徐州重型机械有限公司 | Fix the stepless luffing device of auxiliary and crane |
| JP6757238B2 (en) * | 2016-11-24 | 2020-09-16 | 川崎重工業株式会社 | Hydraulic drive system |
| CN109139583B (en) * | 2018-10-23 | 2024-05-17 | 河南垣发专用车辆集团有限公司 | Hydraulic control system for forklift |
| CN111891946B (en) * | 2020-07-29 | 2022-04-19 | 徐州重型机械有限公司 | Power transmission system and method and crane |
| CN112460078B (en) * | 2020-12-10 | 2024-01-23 | 徐州徐工挖掘机械有限公司 | Hydraulic safety system for oil drainage |
| CN114014187B (en) * | 2021-11-30 | 2023-08-22 | 三一汽车起重机械有限公司 | Hydraulic control system and method and crane |
| CN115215274B (en) * | 2022-08-18 | 2023-09-29 | 北京中科宇航技术有限公司 | System for speed control and automatic regulation in rocket erecting and laying process |
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| JPS595163B2 (en) * | 1979-08-17 | 1984-02-03 | 日立建機株式会社 | Speed control circuit for cranes, etc. |
| SU1109358A1 (en) * | 1982-07-30 | 1984-08-23 | Всесоюзный научно-исследовательский институт строительного и дорожного машиностроения | Self-propelled boom crane |
| CN2695706Y (en) * | 2004-03-31 | 2005-04-27 | 徐州重型机械厂 | Hydraulic guide operation variable-amplitude hydraulic device |
| CN101315068B (en) * | 2008-07-11 | 2012-04-25 | 宁波恒力液压股份有限公司 | Electrohydraulic proportion variable axial plunger pump |
| JP2013193840A (en) * | 2012-03-19 | 2013-09-30 | Kawasaki Heavy Ind Ltd | Hydraulic controller for deck crane |
| CN202829340U (en) * | 2012-10-19 | 2013-03-27 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of boom and crane |
| CN203529814U (en) * | 2013-09-29 | 2014-04-09 | 徐州重型机械有限公司 | Variable amplitude control system for fixed fly jib of crane |
| CN103482476B (en) * | 2013-09-29 | 2015-09-16 | 徐州重型机械有限公司 | A kind of control setup improving crane amplitude variation falling speed |
| CN204265320U (en) * | 2014-07-18 | 2015-04-15 | 徐州重型机械有限公司 | A kind of hoisting crane fixing stepless luffing control system of auxiliary and hoisting crane |
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2014
- 2014-07-18 CN CN201410345980.9A patent/CN104071709B/en active Active
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