CN103591075B - Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder - Google Patents
Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder Download PDFInfo
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- CN103591075B CN103591075B CN201310634677.6A CN201310634677A CN103591075B CN 103591075 B CN103591075 B CN 103591075B CN 201310634677 A CN201310634677 A CN 201310634677A CN 103591075 B CN103591075 B CN 103591075B
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Abstract
The invention discloses a hydraulic control system synchronous with a crane and a balancing weight hydraulic cylinder and a flow control valve. The flow control valve comprises a valve body, a first proportional directional valve set and at least one first oil return auxiliary valve are integrated in the valve body, a pressure oil port, an oil return port, a first oil port and a second oil port are formed outside the valve body, the pressure oil port is used for being communicated with a pressure oil way, the oil return port is used for being communicated with an oil return oil way, and the first oil port and the second oil port are used for being communicated with a rodless cavity and a rod cavity of a first hydraulic cylinder respectively, and the first hydraulic cylinder is used for lifting balancing weight. The flow control valve further comprises a control port used for being connected with a pilot oil way and a control oil port of the first proportional directional valve set, the pressure oil way is communicated with one of the rod cavity and the rodless cavity through the first proportional directional valve set, hydraulic oil in the other one is at least divided into two ways which are communicated with the second oil port through the first proportional directional valve set and all the first oil return auxiliary valves respectively, the oil return channel is additionally arranged in the flow control valve, oil return speed in an oil return cavity of the hydraulic cylinder can be improved, the hydraulic cylinder is adjusted rapidly, and adjustment accuracy is high.
Description
Technical field
The present invention relates to technical field of hydraulic, particularly to a kind of crane, balance weight hydraulic cylinder synchronous action
Hydraulic control system and flow control valve.
Background technology
Weight-balancing device is that crane is used for maintaining a kind of device of equalising torque, its mesh with lift heavy thing in the course of the work
Be ensuring that crane does not occur overthrow accident under specific operation.
Refer to Fig. 1, Fig. 1 is the control principle drawing that in prior art, a kind of typical balance weight hydraulic cylinder synchronous control；
Fig. 2 is the structural representation of counterweight combination in prior art.
Balance weight is typically all to be mounted on the dead astern of crane and the rear both sides of turntable structure, hydraulic pressure by hydraulic cylinder
The quantity of cylinder generally two, is respectively symmetrically the both sides being arranged in turntable structure, with the center of gravity of balance weight when ensureing to be lifted all the time
On crane longitudinal axis, first balance weight is fixed on cylinder barrel or the piston rod of hydraulic cylinder, piston rod extends, drives flat
Weight moves upwards, after balance weight is promoted to predetermined altitude, using bearing pin, balance weight and turntable structure is connected, finally
Release the locking between hydraulic cylinder and balance weight, hydraulic cylinder is reduced to original state.
The synchronism of hydraulic cylinder directly affects balance weight and mounts process and the smooth of turntable pin-and-hole centering and mounting process
Security, at present, the control of two hydraulic cylinder synchronous is mainly accomplished by.
Hydraulic control system includes fuel tank, hydraulic pump, the first control valve, balance weight balanced valve, flow divider, hydraulic cylinder, first
Hydraulic oil in first fuel tank is pumped to the first control valve through hydraulic pump, and then the hydraulic oil of high pressure is carried out through the first control valve
Balance weight oil cylinder is flowed to, when being balanced transferring again, hydraulic oil is from the first control valve A mouth stream after pressure restriction, direction controlling
Go out, enter balanced valve V2 mouth, enter the rod chamber of hydraulic cylinder by the bypass check valve in balanced valve, open rodless cavity simultaneously
Drainback passage, and promote piston stroking upward, be equivalent to hydraulic cylinder and retract.Now because piston rod end and base are to be supported on vehicle frame
In plane, most of counterweight block is acted on cylinder barrel and is departed from turntable structure, therefore during hydraulic cylinder retraction, cylinder barrel drives big portion
Balance-dividing pouring weight slowly moves down, that is, realize the decentralization of balancing weight.For the sake of safety, balanced valve is to be fixedly connected with oil cylinder
Together.In decentralization process, oil cylinder rodless cavity is discharged fluid and is entered control valve B mouth after flow divider, then through controlling
Valve returns to fuel tank.In the same manner, when being balanced the lifting of weight, hydraulic oil then flows out from control valve B mouth, carries out flow through flow divider
The rodless cavity of oil cylinder is entered respectively by balanced valve internal bypass check valve, now bar opened by balanced valve simultaneously after mean allocation
Chamber drainback passage, rod chamber inner fluid enters control valve through A mouth, then flows back to fuel tank.
Mainly affected by the synchronization action that the operation principle of above-mentioned hydraulic system can be seen that two hydraulic cylinders in prior art
Factor is：The setting pressure of the balanced valve on hydraulic cylinder, the assignment accuracy of part flow arrangement and the two hydraulic cylinder accuracies of manufacture.Its
In, balanced valve pressure consistency adjust relatively difficult, adjust difficulty also ratio larger, particularly with balanced valve in hydraulic cylinder
Situation, the pressure of balanced valve adjusts more difficult；On the other hand, for part flow arrangement, once the problems such as break down
The synchronism of impact hydraulic cylinder, it is impossible to be adjusted to part flow arrangement, can only change part flow arrangement, liquid therefore of the prior art
Pressure system suitability and sustainability are all poor.
In addition, also often being adjusted using the mode of sensor and flow valve cooperation in some less fields of hydraulic cylinder flow-rate ratio
Save the synchronism of two hydraulic cylinders, that is, sensor passes through to detect the stroke of two hydraulic cylinders, calculates journey error, adjusts according to journey error
Save the flow of the flow valve being connected with corresponding hydraulic cylinder, make two hydraulic cylinders reach synchronous purpose.
At present, the actuator port of flow valve according to the difference of hydraulic cylinder works state, sometimes make by the actuator port of flow valve
Oil-in, makees oil-out, therefore size is substantially the same, generally it is often desired to recirculating oil quantity compares sometimes
Greatly, recirculating oil quantity is bigger, and hydraulic cylinder speed is faster, due to the limitation of port size in flow valve, is difficult to improve oil return speed
Degree.
Therefore, how to improve and be used in prior art controlling the hydraulic system of balance weight hydraulic cylinder synchronous action, this hydraulic pressure system
System is rapid to the regulation of hydraulic cylinder, and degree of regulation is higher, is those skilled in that art's technical problem urgently to be resolved hurrily.
Content of the invention
The purpose of the present invention is for providing a kind of crane, the hydraulic system controlling balance weight hydraulic cylinder synchronous action and flow
Regulating valve, the hydraulic system with this flow control valve is rapider to the regulation of hydraulic cylinder, and degree of regulation is higher.
For solving above-mentioned technical problem, the invention provides a kind of flow control valve, including valve body, in described valve body, collection has
First proportional reversing valve group and at least one the first oil return pair valve；Be provided with outside described valve body pressure oil port, oil return opening, first
Hydraulic fluid port, the second hydraulic fluid port and control mouth；
Described pressure oil port, for connecting pressure oil circuit；
Described oil return opening, for connecting oil return circuit；
Described first hydraulic fluid port is respectively used to connect the nothing of the first hydraulic cylinder for up and down balance system weight with described second hydraulic fluid port
Rod cavity and rod chamber；
Described control mouth, for connecting the control port of guide's oil circuit and described first proportional reversing valve group；
Described pressure oil circuit connects described rod chamber and rodless cavity one of both through described first proportional reversing valve group, another
Hydraulic oil in person is at least divided into two-way, connects institute through described first proportional reversing valve group with each described first oil return pair valve respectively
State the second hydraulic fluid port.
Preferably, the oil duct of setting in described flow control valve is passed through in two control ports of described first oil return pair valve respectively
Connect with the hydraulic oil working hole of described first proportional reversing valve group and low pressure oil working hole.
Preferably, described first proportional reversing valve group includes commutate main valve and adjustable-pressure pressure-reducing valve, described control mouth
Control mouth through described adjustable-pressure pressure-reducing valve connection described commutation main valve, the pressure set points of described pressure-reducing valve are according to each liquid
Journey error between cylinder pressure determines.
Preferably, be also integrated with the valve body of described flow control valve described second proportional reversing valve group and at least one the
Two oil return pair valves；It is further provided with the 3rd hydraulic fluid port, the 4th hydraulic fluid port outside described valve body；
Described 3rd hydraulic fluid port and the 4th hydraulic fluid port, and have for the rodless cavity of the heavy second hydraulic cylinder of up and down balance system for connection
Rod cavity；
Two control ports of described second proportional reversing valve group valve are connected with described control mouth or disconnect；
Described pressure oil circuit connects rod chamber and the rodless cavity of described second hydraulic cylinder through described second proportional reversing valve group
One of both, the hydraulic oil in another one is at least divided into two-way, respectively through described second proportional reversing valve group and each described second
Oil return pair valve connects described second hydraulic fluid port.
Preferably, described second proportional reversing valve group includes the second commutation main valve and adjustable-pressure pressure-reducing valve, described control
The control mouth through described adjustable-pressure pressure-reducing valve connection described commutation main valve for the donsole, the pressure set points of described pressure-reducing valve according to
Journey error between each hydraulic cylinder determines.
Preferably, the oil duct of setting in described flow control valve is passed through in two control ports of described second oil return pair valve respectively
Connect with the hydraulic oil working hole of described second proportional reversing valve group and low pressure oil working hole.
Preferably, the valve body of described flow control valve is additionally provided with the overflow hydraulic fluid port for connecting fuel tank, each described subtracts
The overfall of pressure valve connects described overflow hydraulic fluid port.
Drainback passage is adds additional, the hydraulic oil of hydraulic cylinder is more than passing through in flow control valve provided by the present invention
The valve port of commutation valve group flow to oil return circuit, and hydraulic oil flow to oil return circuit also by the first oil return pair valve, so can be significantly
Increase the area of return flow line, the oil return speed of hydraulic cylinder oil back chamber can be improved, the regulation for hydraulic cylinder is rapider, and
And degree of regulation is higher.
On the basis of above-mentioned flow control valve, present invention also offers a kind of hydraulic pressure of balance weight hydraulic cylinder synchronous action
Control system, including the first hydraulic cylinder heavy for up and down balance system and second hydraulic cylinder, and hydraulic pump, also set in hydraulic system
There is the flow control valve described in any of the above-described；The pressure oil port of described flow control valve connects the outlet oil of described hydraulic pump
Road；
Each described hydraulic cylinder is equipped with the detection part for measuring its stroke, also includes controller, described controller
Receive the detection signal of each described detection part, and judge the journey error of hydraulic cylinder described in two according to described detection signal, when
When described journey error is in outside allowed band, described controller adjusts the aperture of accordingly described flow control valve, until two
The journey error of described hydraulic cylinder is in allowed band.
Preferably, also include two balanced valves, be separately positioned on the rodless cavity of described first hydraulic cylinder and described flow controls
On connection oil circuit between valve, the rodless cavity of second hydraulic cylinder and described flow control valve, the control port of described balanced valve with
Corresponding hydraulic cylinder rod chamber connection.
Preferably, described detection part is mangneto sensor, and the electronics storehouse of described mangneto sensor is arranged at described first
Outside the cylinder bottom of hydraulic cylinder and second hydraulic cylinder, the piston of each hydraulic cylinder and piston rod are provided with and are co-axially mounted hole, for holding
That receives described mangneto sensor stretches out probe, and described stretches out probe and described installing hole circumference dynamic sealing.
Additionally, present invention also offers a kind of crane, including balance weight and be used for controlling balance weight hydraulic cylinder synchronous
The hydraulic control system of action, described hydraulic control system is the hydraulic control system described in any of the above-described.
Brief description
Fig. 1 is the control principle drawing that in prior art, a kind of typical balance weight hydraulic cylinder synchronous control；
Fig. 2 is the structural representation of counterweight combination in prior art；
Fig. 3 is the control principle drawing that in an embodiment of the present invention, balance weight hydraulic cylinder synchronous control；
The mounting structure schematic diagram of detection part in a kind of specific embodiment that Fig. 4 provides for the present invention；
The control flow chart of hydraulic control system in a kind of specific embodiment that Fig. 5 provides for the present invention.
Wherein, in Fig. 1 and Fig. 2, the one-to-one relationship between reference and component names is as follows：
1 hydraulic pump, 2 control valves, 3 first hydraulic cylinders, 4 balanced valves, 5 second hydraulic cylinders, 6 part flow arrangements, 7 fuel tanks, 8 balances
Pouring weight, 9 counterweight blocks.
Wherein, in Fig. 3 to Fig. 5, the one-to-one relationship between reference and component names is as follows：
10 hydraulic pumps, 11 first commutation main valves, 12 first secondary oil return valves, 13 pressure-reducing valves, 20 pressure-control valves, 21 second change
To main valve, 22 second oil returns pair valves, 30 first hydraulic cylinders, 31 balanced valves, 32 detection parts, 33 second hydraulic cylinders, 3 pistons, 312
Piston rod, 313 piston rods, 314 stretch out probe, 321 electronics storehouses.
Specific embodiment
The core of the present invention is for providing a kind of crane, the hydraulic system controlling balance weight hydraulic cylinder synchronous action and flow
Regulating valve, the hydraulic system with this flow control valve is rapider to the regulation of hydraulic cylinder, and degree of regulation is higher.
Without loss of generality, so that flow control valve is in the application in the hydraulic system of balance weight hydraulic cylinder synchronous action as a example it is situated between
Continue technical scheme, certainly, is also not excluded for flow control valve provided by the present invention and is applied to adjustment part synchronization in other systems
Sex chromosome mosaicism.
In order that those skilled in the art more fully understands technical scheme, with reference to hydraulic scheme with
And control principle, the drawings and specific embodiments the present invention is described in further detail.
Refer to Fig. 3, Fig. 3 is the control principle drawing that in an embodiment of the present invention, balance weight hydraulic cylinder synchronous control.
The hydraulic control system of the balance weight hydraulic cylinder synchronous action that the present invention provides, including for the of up and down balance system weight
One hydraulic cylinder 30 and second hydraulic cylinder 33, and hydraulic pump 10, hydraulic pump 10 provides pressure oil, first hydraulic cylinder 30 and the second liquid
Cylinder pressure 33 is equipped with the detection part 32 for measuring its stroke, and detection part 32 can be with the motion row of real-time detection hydraulic cylinder
Journey.It is additionally provided with flow control valve, flow control valve includes valve body, collection has the first proportional reversing valve group and at least one in hydraulic system
Individual first oil return pair valve 12；It is provided with pressure oil port P, oil return inlet T, the first hydraulic fluid port A1, the second hydraulic fluid port B1 and control outside valve body
Mouth P '；Pressure oil port P, for connecting pressure oil circuit, pressure oil port P herein connects hydraulic pump 10, both connections certainly
Pressure-control valve 20 grade part can be arranged on pipeline, to provide stable pressure；Oil return inlet T, for connecting oil return circuit；
First hydraulic fluid port A1 and the second hydraulic fluid port B1 is respectively used to connect the rodless cavity of first hydraulic cylinder 30 being used for up and down balance system weight and has bar
Chamber；Control mouth P ', for connecting the control port of guide's oil circuit and the first proportional reversing valve group.Pressure oil circuit warp in the present invention
First proportional reversing valve group connection rod chamber and rodless cavity one of both, the hydraulic oil in another one is at least divided into two-way, respectively
Connect the second hydraulic fluid port B1 through the first proportional reversing valve group with each first oil return pair valve 12.
Pressure oil port P of flow control valve connects the outlet oil circuit of hydraulic pump 10, in can directly connecting it is also possible to pass through
Between part realize both connections, be provided with the detection part 32 for measuring its stroke, hydraulic control in each hydraulic cylinder
Controller is also included, controller receives the detection signal of each detection part 32, and judges two hydraulic pressure according to detection signal in system
The journey error of cylinder, when outside journey error being in allowed band, controller adjusts the aperture of corresponding discharge control valve, until
The journey error of two hydraulic cylinders is in allowed band.
Drainback passage is adds additional, the hydraulic oil of hydraulic cylinder is more than passing through in flow control valve provided by the present invention
The valve port of commutation valve group flow to oil return circuit, and hydraulic oil flow to oil return circuit also by the first oil return pair valve 12, so can be big
Increase the area of add-back circulation road, can improve the oil return speed of hydraulic cylinder oil back chamber, the regulation for hydraulic cylinder is rapider,
And degree of regulation is higher.
Further, two control ports of the first oil return pair valve 12 can pass through the oil duct of setting in flow control valve respectively
Connect with the hydraulic oil working hole of the first proportional reversing valve group and low pressure oil working hole, so when the height of the first proportional reversing valve group
During force feed working hole conducting, also effect simultaneously has pilot pressure oil for the control port of the first oil return pair valve 12 corresponding side, thus the
Corresponding valve port within one oil return pair valve 12 is opened, and the corresponding chambers of hydraulic cylinder connect oil return by described first oil return pair valve 12
Oil circuit.
This set-up mode is conducive to the first proportional reversing valve and the first oil return pair valve 12 to connect oil return circuit simultaneously, increases liquid
Cylinder pressure oil return speed, hydraulic circuit within flow control valve for the first oil return pair valve 12 controls, and can simplify hydraulic system cloth
Put, and control accuracy is also higher.
Further, the first proportional reversing valve group can include the first commutation main valve 11 and adjustable-pressure pressure-reducing valve 13,
Control mouth P ' through adjustable-pressure pressure-reducing valve 13 connection first commutation main valve 11 control mouth P ', the pressure set points of pressure-reducing valve 13
Determined according to the journey error between each hydraulic cylinder.
In the various embodiments described above, the second proportional reversing valve group and at least one in the valve body of flow control valve, can also be integrated with
Individual second oil return pair valve 22；It is further provided with the 3rd hydraulic fluid port A2, the 4th hydraulic fluid port B2 outside valve body；3rd hydraulic fluid port A2 and the 4th hydraulic fluid port
B2, is used for rodless cavity and the rod chamber of the second hydraulic cylinder 33 of up and down balance system weight for connection；Second proportional reversing valve group valve
Two control ports and control mouth P ' it is connected or disconnect；Pressure oil circuit connects having of second hydraulic cylinder 33 through the second proportional reversing valve group
Rod cavity and rodless cavity one of both, the hydraulic oil in another one is at least divided into two-way, respectively through the second proportional reversing valve group and each
Second oil return pair valve 22 connects the second hydraulic fluid port B1.
The structure of the second proportional reversing valve group may be referred to the structure of the first proportional reversing valve group, can include the second commutation
Main valve 21 and the pressure-reducing valve 13 being arranged in the control port of the second commutation main valve.
So, first hydraulic cylinder 30 and the flow control component of second hydraulic cylinder 33 is controlled to be all disposed within same valve body,
Simplify the outside setting of hydraulic system further, and be advantageously implemented the action association between the control element controlling two hydraulic cylinders
Tonality and synchronism.
In the same manner, two control ports of the second oil return pair valve 22 can also pass through the oil of setting in described flow control valve respectively
Road is connected with the hydraulic oil working hole of described second proportional reversing valve group and low pressure oil working hole.
Further, the valve body of the flow control valve in the various embodiments described above is additionally provided with the overflow for connecting fuel tank
Hydraulic fluid port T ', the overfall connection overflow hydraulic fluid port T ' of each pressure-reducing valve 13.
Refer to Fig. 5, the control flow chart of hydraulic control system in a kind of specific embodiment that Fig. 5 provides for the present invention.
The present invention is used for being lifted or the Synchronization Control of hydraulic cylinder of balance weight of landing mainly is carried out by following steps, has
Body is as follows：
The displacement signal of S1, detection the first hydraulic jack and the second hydraulic jack；
S2, according to upper displacement signal calculate the displacement L1 of the first hydraulic jack and displacement L2 of the second hydraulic jack；And
Judge whether both shift differences are located in values, if L1-L2>L, then carry out step S3, otherwise carries out step
S4；
Through verification experimental verification, L is 5mm, and the synchronism control of two hydraulic jacks is preferable.
S3, pid control module adjust the curtage value of the flow control valve of corresponding hydraulic cylinder；
S4, judge the size of L1-L2 and (- L), if L1-L2<(- L), then carry out step S3；Otherwise carry out step S5；
S5, determine two hydraulic cylinders for equal currents control, output primary current control corresponding hydraulic cylinder action.
Wherein, step S01 can also be increased before carrying out step S1, start and initialize and S02, whether enter flat
The step of weight operation judges, if it is, carry out step S1；Otherwise terminate；In the same manner, S7, whether can also be increased after step S6
Proceed balance weight operation, if return to step S1, otherwise carry out step S8；Step S8, end.
Structure and installation form for detection part can following present a kind of preferred embodiment party by various ways
Formula.
Refer to Fig. 4, the mounting structure schematic diagram of detection part in a kind of specific embodiment that Fig. 4 provides for the present invention；
Detection part 32 is mangneto sensor, and the electronics storehouse 321 of mangneto sensor is arranged at outside the cylinder bottom of hydraulic cylinder, liquid
It is provided with the piston 3 of cylinder pressure and piston 3 bar and is co-axially mounted hole, stretch out probe 314 for accommodate mangneto sensor, and stretch out
Probe and installing hole circumference dynamic sealing
In magnetostrictive displacement sensor certainty of measurement is high, use environment is more severe displacement and liquid level measuring system.Tool
Have high precision, reproducible, reliable and stable, non-contact measurement, life-span length, the features such as easy for installation, environmental suitability is strong.
Hydraulic control system can also include two balanced valves 31, is separately positioned on rodless cavity and the flow of first hydraulic cylinder 30
On connection oil circuit between control valve, the rodless cavity of second hydraulic cylinder 33 and flow control valve, the control port of balanced valve 31 with
The rod chamber connection of corresponding hydraulic cylinder.
Additionally, present invention also offers a kind of crane, including balance weight and be used for controlling balance weight hydraulic cylinder synchronous
The hydraulic control system of action, hydraulic system is the hydraulic control system of any of the above-described embodiment.
Because crane includes above-mentioned hydraulic control system, therefore crane also has the above-mentioned technology effect of hydraulic control system
Really.
Crane other structures refer to prior art, and therefore not to repeat here.
The hydraulic system to crane provided by the present invention, controlling balance weight hydraulic cylinder synchronous action above and flow are adjusted
Section valve is described in detail.Specific case used herein is set forth to the principle of the present invention and embodiment, with
The explanation of upper embodiment is only intended to help and understands the method for the present invention and its core concept.It should be pointed out that for this technology neck
For the those of ordinary skill in domain, under the premise without departing from the principles of the invention, the present invention can also be carried out some improve and
Modify, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a kind of hydraulic control system of balance weight hydraulic cylinder synchronous action, including the first hydraulic cylinder for up and down balance system weight
(30) and second hydraulic cylinder (33), and hydraulic pump it is characterised in that
Including flow control valve；Described flow control valve includes valve body, be integrated with described valve body the first proportional reversing valve group and
At least one first oil return pair valve (12)；It is provided with pressure oil port (P), oil return opening (T), the first hydraulic fluid port outside described valve body
(A1), the second hydraulic fluid port (B1) and control mouth；
Described pressure oil port (P), for connecting pressure oil circuit；
Described oil return opening (T), for connecting oil return circuit；
Described first hydraulic fluid port (A1) is respectively used to connect the first hydraulic cylinder for up and down balance system weight with described second hydraulic fluid port (B1)
(30) rodless cavity and rod chamber；
Described control mouth (P '), for connecting the control port of guide's oil circuit and described first proportional reversing valve group；
Described pressure oil circuit connects described rod chamber and rodless cavity one of both through described first proportional reversing valve group, in another one
Hydraulic oil be at least divided into two-way, respectively through described first proportional reversing valve group with each described first oil return pair valve (12) connect institute
State the second hydraulic fluid port (B1) and described oil return opening (T)；
The pressure oil port of described flow control valve connects the outlet oil circuit of described hydraulic pump；
Each described hydraulic cylinder is equipped with the detection part (32) for measuring its stroke, also includes controller, described controller
Receive the detection signal of each described detection part (32), and missed according to the stroke that described detection signal judges hydraulic cylinder described in two
Difference, when outside described journey error being in allowed band, described controller adjusts the aperture of accordingly described flow control valve, directly
Journey error to hydraulic cylinder described in two is in allowed band；
Specifically, described controller includes pid control module, and described pid control module adjusts the aperture of described flow control valve；
Described allowed band concrete numerical value is 5mm.
2. hydraulic control system according to claim 1, it is characterised in that also including two balanced valves, is separately positioned on institute
State the rodless cavity of first hydraulic cylinder (30) and described flow control valve, the rodless cavity of second hydraulic cylinder (33) and described flow control
On connection oil circuit between valve, the control port of described balanced valve is connected with corresponding hydraulic cylinder rod chamber.
3. hydraulic control system according to claim 1 is it is characterised in that described detection part (32) senses for mangneto
Device, the electronics storehouse of described mangneto sensor is arranged at outside described first hydraulic cylinder and the cylinder bottom of second hydraulic cylinder, each hydraulic cylinder
Piston and piston rod on be provided with and be co-axially mounted hole, stretch out probe for accommodate described mangneto sensor, and described stretch out
Probe and described installing hole circumference dynamic sealing.
4. hydraulic control system according to claim 1 it is characterised in that described first oil return pair valve (12) two controls
Hydraulic fluid port respectively by the oil duct of setting in described flow control valve and the hydraulic oil working hole of described first proportional reversing valve group and
Low pressure oil working hole connects.
5. hydraulic control system according to claim 4 is it is characterised in that described first proportional reversing valve group includes commutating
Main valve and adjustable-pressure pressure-reducing valve (13), described control mouth (P ') through described adjustable-pressure pressure-reducing valve (13) connect described in change
To the control mouth (P ') of main valve, the pressure set points of described pressure-reducing valve (13) determine according to the journey error between each hydraulic cylinder.
6. the hydraulic control system according to any one of claim 1 to 5 is it is characterised in that the valve of described flow control valve
It is also integrated with the second proportional reversing valve group and at least one the second oil return pair valve (22) in vivo；It is further provided with outside described valve body
3rd hydraulic fluid port (A2), the 4th hydraulic fluid port (B2)；
Described 3rd hydraulic fluid port (A2) and the 4th hydraulic fluid port (B2), for the nothing of the second hydraulic cylinder (33) for up and down balance system weight for the connection
Rod cavity and rod chamber；
Two control ports of described second proportional reversing valve group are connected with described control mouth (P ') or disconnect；
Described pressure oil circuit connects rod chamber and the rodless cavity of described second hydraulic cylinder (33) through described second proportional reversing valve group
One of both, the hydraulic oil in another one is at least divided into two-way, respectively through described second proportional reversing valve group and each described second
Oil return pair valve (22) connects described 4th hydraulic fluid port (B2) and described oil return opening.
7. hydraulic control system according to claim 6 it is characterised in that described second oil return pair valve (22) two controls
Hydraulic fluid port respectively by the oil duct of setting in described flow control valve and the hydraulic oil working hole of described second proportional reversing valve group and
Low pressure oil working hole connects.
8. hydraulic control system according to claim 7 is it is characterised in that described second proportional reversing valve group includes second
Commutation main valve (21) and adjustable-pressure pressure-reducing valve (13), described control mouth (P ') is through described adjustable-pressure pressure-reducing valve (13) even
The control mouth (P ') of logical described commutation main valve, the pressure set points of described pressure-reducing valve (13) are according to the stroke between each hydraulic cylinder by mistake
Difference determines.
9. hydraulic control system according to claim 5 is it is characterised in that also set up on the valve body of described flow control valve
There is the overflow hydraulic fluid port (T') for connecting fuel tank, the overfall of each described pressure-reducing valve (13) connects described overflow hydraulic fluid port (T').
10. a kind of crane, the hydraulic control system including balance weight and for controlling balance weight hydraulic cylinder synchronous action, its
It is characterised by, described hydraulic control system is the hydraulic control system described in any one of claim 1 to 9.
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| CN201310634677.6A CN103591075B (en) | 2013-11-29 | 2013-11-29 | Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder |
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| CN201310634677.6A CN103591075B (en) | 2013-11-29 | 2013-11-29 | Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder |
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| CN114135528A (en) * | 2021-12-10 | 2022-03-04 | 徐州徐工液压件有限公司 | Composite multi-way valve and energy-saving composite action control tower crane jacking hydraulic system |
| CN115045876A (en) * | 2022-06-14 | 2022-09-13 | 三一汽车起重机械有限公司 | Control method of synchronous hydraulic system, counterweight synchronous hydraulic system and crane |
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| CN1300472C (en) * | 2004-06-16 | 2007-02-14 | 浙江大学 | Shielding spiral conveyor hydraulic system with proportional feedback control and accumulator oil supplementary |
| DE102006007935A1 (en) * | 2006-02-21 | 2007-10-25 | Liebherr France Sas | Control device and hydraulic pilot control |
| CN201297304Y (en) * | 2008-10-07 | 2009-08-26 | 江苏武进液压启闭机有限公司 | Plunger oil cylinder of hydraulic hoist with travel detection device placed inside |
| CN202296914U (en) * | 2011-08-25 | 2012-07-04 | 徐州重型机械有限公司 | Telescopic arm control system and crane |
| CN202967952U (en) * | 2012-12-10 | 2013-06-05 | 徐州重型机械有限公司 | Rotary control hydraulic system and crane |
| CN103334979B (en) * | 2013-07-23 | 2015-08-19 | 徐州重型机械有限公司 | Double hydraulic cylinder synchronous control system and apply the engineering machinery of this control system |
| CN103398039B (en) * | 2013-08-22 | 2015-10-28 | 徐州重型机械有限公司 | A kind of control valve device, multi-cylinder synchronous hydraulic control system and hoist |
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