CN107061377B - A kind of heavy duty lifting electrohydraulic control system - Google Patents
A kind of heavy duty lifting electrohydraulic control system Download PDFInfo
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- CN107061377B CN107061377B CN201710202821.7A CN201710202821A CN107061377B CN 107061377 B CN107061377 B CN 107061377B CN 201710202821 A CN201710202821 A CN 201710202821A CN 107061377 B CN107061377 B CN 107061377B
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- hydraulic
- reversal valve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/05—Hydraulic jacks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B2013/0448—Actuation by solenoid and permanent magnet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A kind of heavy duty lifting electrohydraulic control system, the A mouths of lifting valve (3) are connect through hydraulic control one-way valve (6) with the A mouths of lifting hydraulic cylinder (12)；The A mouths of pilot control valve (5) are connect with the B mouths of the X mouths of hydraulic control one-way valve (6) and lifting hydraulic cylinder (12)；The B mouths of hydraulic control one-way valve (6) are connect with the P mouths of the 4th reversal valve (13) and T mouthfuls, and between be serially connected with the first and second reversal valve, pressurized cylinder (9) and the second check valve (16)；It is connected to the A mouths of the second check valve (16) after the B mouths connection of the B mouths and the first check valve (10) of pressurized cylinder (9)；The A mouths of 4th reversal valve (13) are connect with the actuator port of accumulator (14), and the actuator port of accumulator (14) is also associated with first pressure sensor (15).The system can carry out pressure supplement to lifting hydraulic cylinder in time, the case where being avoided that structural member torsional deformation caused by hydraulic cylinder sedimentation or multiple lifting hydraulic cylinder unbalance loadings or even damage.
Description
Technical field
The present invention relates to a kind of control systems, and in particular to a kind of heavy duty lifting electrohydraulic control system.
Background technology
In large-scale construction project, often there are some large-sized structural parts, such as bridge, heavy type truss, building etc.,
It needs to carry out lift operation using hydraulic system when installation.After weight lifts in place, because when a variety of causes may need long
Between holding in the position, due to the variation of environment temperature, internal leakage of hydraulic cylinder etc., the piston rod of hydraulic cylinder can inevitably bounce back
Certain length, this retracted length are exactly the settling amount of hydraulic cylinder.If settling amount very little, generally will not to hoisting system and
The weight lifted has an impact, but if settling amount is excessive, and it is uneven to will result in part lifting hydraulic cylinder load, especially
It is for when the structural member lifted is precision equipment, its structure easily being made to deform or damage.
In existing technology, there is the technical solution that pressurize is carried out using accumulator, as shown in Figure 1, hydraulic control one-way valve a300
Effect be ensure hydraulic cylinder a100 inner fluids do not flow out reversely, when because certain factors cause the fluid in hydraulic cylinder a100 to subtract
When few, the advantages of fluid in accumulator a200 can supplement it, this scheme is simple in structure, is easy to implement and cost
It is cheap, it has the drawback that, accumulator can not be completely secured hydraulic cylinder and not settle.Even if if sedimentation not
It can guarantee that the pressure in hydraulic cylinder does not reduce, that is to say, that the power output of hydraulic cylinder can also reduce, for multiple lifting hydraulic cylinders
For there are still the non-uniform problems of load between hydraulic cylinder, the structural member generation that thus still may be caused to be lifted, support
Torsional deformation even damages.
Invention content
In view of the above existing problems in the prior art, the present invention provides a kind of heavy duty lifting electrohydraulic control system, the systems
High-voltage oil liquid is supplemented into hydraulic cylinder in time, can prevent from, when sedimentation occurs in lifting hydraulic cylinder and power output becomes small, being lifted, being propped up
The problems such as structural member of support deforms caused by sedimentation or unbalance loading.
To achieve the goals above, the present invention provides a kind of heavy duty lifting electrohydraulic control system, including hydraulic pump, lifting
Valve, fuel tank, pilot control valve, lifting hydraulic cylinder and accumulator further include pressurized cylinder and controller, the hydraulic pump oil inlet
It is connect with fuel tank by pipeline, the P mouths connection of the P mouths and pilot control valve of oil outlet and lifting valve；
The A mouths of lifting valve are connect with the oil inlet of hydraulic control one-way valve, oil outlet and the lifting hydraulic pressure of the hydraulic control one-way valve
The rodless cavity of cylinder connects；
The A mouths of the pilot control valve are connect with the rod chamber of the control mouth of hydraulic control one-way valve and lifting hydraulic cylinder；
Displacement sensor and second pressure sensor are provided on the lifting hydraulic cylinder；
The oil outlet of the hydraulic control one-way valve is also connect with the P mouths of the 4th reversal valve and T mouthfuls, in the connection oil with T mouthfuls
Road is serially connected with the first reversal valve, the second reversal valve, pressurized cylinder and the second check valve；The A mouths and second of first reversal valve
The P mouths of reversal valve connect, A mouths of the second reversal valve and B mouthfuls respectively with the oil inlet of the big chamber of pressurized cylinder and the first check valve company
It is logical；It is connected to the oil inlet of the second check valve after the oil outlet connection of the small chamber and the first check valve of pressurized cylinder, pressurized cylinder returns
Hydraulic fluid port is connected to fuel tank；
The A mouths of 4th reversal valve are connect with the actuator port of accumulator, and the actuator port of accumulator is also associated with
One pressure sensor；
The T mouths of the T mouths of the lifting valve, the T mouths of pilot control valve and the second reversal valve are connected to fuel tank；
Automatically controlled mouth, the pilot control of the first pressure sensor, displacement sensor, second pressure sensor, lifting valve
The automatically controlled mouth of valve, the automatically controlled mouth of the first reversal valve, the automatically controlled mouth of the second reversal valve and the 4th reversal valve automatically controlled mouth with control
Device connects.
Further, it is also serially connected with third reversal valve between the B mouths of the hydraulic control one-way valve and the A mouths of lifting hydraulic cylinder,
The automatically controlled mouth of third reversal valve is connect with controller.By the way that third reversal valve is arranged, redundancy structure, energy are constituted with hydraulic control one-way valve
It prevents the fluid in lifting hydraulic cylinder from revealing, and its fluid when compensation work is avoided reversely to flow out, further increase system can
By property.
Further, it in order to limit the maximum working pressure of system, to which effectively safeguards system is reliably run, also wraps
Overflow valve is included, the P mouths of the overflow valve are connect with the oil outlet of hydraulic pump, and T mouthfuls connect with fuel tank.
Further, lifting valve, pilot control valve and the 4th reversal valve are two-bit triplet solenoid directional control valve.
Further, the second reversal valve is two four-way electromagnetic reversing valves.
Preferably, to improve sealing effect, the first reversal valve, third reversal valve, the 4th reversal valve select ball-valve structure.
The present invention is suitable for the occasion of heavy duty lifting, can prevent lifting hydraulic cylinder from the problem of sedimentation and unbalance loading occur, carry
The effect of height lifting.When lifting hydraulic cylinder lifts weight, by the increased pressurized cylinder with size chamber, fluid is from big chamber
Input, small chamber output, to generate certain high pressure oil night and be stored in accumulator, when lifting hydraulic cylinder maintains lifting high
Degree, when oil liquid pressure declines, controller by the displacement sensor that is arranged in lifting hydraulic cylinder and second pressure sensor come
The pressure and retraction situation of hydraulic cylinder are known in time, and then realize accumulator by controlling the 4th reversal valve, third reversal valve
High-voltage oil liquid supplement is carried out to hydraulic cylinder rodless cavity, it is therefore prevented that lifting hydraulic cylinder occurs settling and power output becomes smaller, and effectively avoids
The deformation that is distorted of structural member caused by the structural member sedimentation lifted, supported or multiple lifting hydraulic cylinder unbalance loadings is even damaged
It is bad.
Description of the drawings
Fig. 1 is the structural schematic diagram of the prior art；
Fig. 2 is the operation principle schematic diagram of the present invention.
In figure：100, hydraulic cylinder a, 200, accumulator a, 300, hydraulic control one-way valve a, 1, hydraulic pump, 2, overflow valve, 3, lifting
Valve, 4, fuel tank, 5, pilot control valve, 6, hydraulic control one-way valve, the 7, first reversal valve, the 8, second reversal valve, 9, pressurized cylinder, 10,
One check valve, 11, third reversal valve, 12, lifting hydraulic cylinder, 12-1, displacement sensor, 12-2, second pressure sensor, 13,
4th reversal valve, 14, accumulator, 15, first pressure sensor, the 16, second check valve, 17, controller.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Fig. 2, a kind of heavy duty lifting electrohydraulic control system, including hydraulic pump 1, lifting valve 3, fuel tank 4, pilot control
Valve 5, lifting hydraulic cylinder 12 and accumulator 14, further include pressurized cylinder 9 and controller 17, and 1 oil inlet of hydraulic pump passes through pipe
Road is connect with fuel tank 4, and oil outlet is connect with the P mouths of the P of lifting valve 3 mouths and pilot control valve 5；
The A mouths of lifting valve 3 are connect with the oil inlet of hydraulic control one-way valve 6, oil outlet and the lifting liquid of the hydraulic control one-way valve 6
The rodless cavity of cylinder pressure 12 connects；
The A mouths of the pilot control valve 5 connect with the rod chamber of the control mouth of hydraulic control one-way valve 6 and lifting hydraulic cylinder 12
It connects；
Displacement sensor 12-1 and second pressure sensor 12-2 are provided on the lifting hydraulic cylinder 12；
The oil outlet of the hydraulic control one-way valve 6 is also connect with the P mouths of the 4th reversal valve 13 and T mouthfuls, in the connection with T mouthfuls
The first reversal valve 7, the second reversal valve 8, pressurized cylinder 9 and the second check valve 16 are serially connected on oil circuit；The A of first reversal valve 7
Mouthful connect with the P mouths of the second reversal valve 8, the A mouths of the second reversal valve 8 and B mouthfuls respectively with the big chamber of pressurized cylinder 9 and the first check valve
10 oil inlet connection；Oil inlet after the connection of the oil outlet of the small chamber of pressurized cylinder 9 and the first check valve 10 with the second check valve 16
Mouth connection, the oil return opening of pressurized cylinder 9 are connected to fuel tank 4；
The A mouths of 4th reversal valve 13 are connect with the actuator port of accumulator 14, and the actuator port of accumulator 14 also connects
It is connected to first pressure sensor 15；
The T mouths of the T mouths of the lifting valve 3, the T mouths of pilot control valve 5 and the second reversal valve 8 are connected to fuel tank 4；
The first pressure sensor 15, displacement sensor 12-1, second pressure sensor 12-2, lifting valve 3 it is automatically controlled
The automatically controlled mouth and the 4th reversal valve 13 of mouth, the automatically controlled mouth of pilot control valve 5, the automatically controlled mouth of the first reversal valve 7, the second reversal valve 8
Automatically controlled mouth connect with controller 17.
For the oil liquid leakage for preventing in lifting hydraulic cylinder 12, and its fluid when compensation work is avoided reversely to flow out, further
The reliability of raising system is also serially connected between the oil outlet and the rodless cavity of lifting hydraulic cylinder 12 of this system hydraulic control one-way valve 6
The automatically controlled mouth (the electromagnet 4YA of third reversal valve 11) of third reversal valve 11, third reversal valve 11 is connect with controller 17.Hydraulic control
Check valve 6 and third reversal valve 11 constitute Redundancy Design, can improve the reliability of system.Third reversal valve 11 is in addition to preventing from lifting
Outside the effect of oil liquid leakage in hydraulic cylinder 12, the fluid of lifting hydraulic cylinder 12 when compensation work can also be avoided reversely to flow out.
In order to play the role of overload protection to system, it is additionally provided with overflow valve 2, the P mouths and hydraulic pump of the overflow valve 2
1 oil outlet connection, T mouthfuls connect with fuel tank 4.
Lifting valve 3, pilot control valve 5 and the 4th reversal valve 13 are two-bit triplet solenoid directional control valve, and the second reversal valve 8 is
Two four-way electromagnetic reversing valves.When the electromagnet of the lifting valve 3 must not be electric, it is operated in left position, the fluid of hydraulic fluid port P is cut
Only, the fluid between hydraulic fluid port A and hydraulic fluid port T can flow freely；When its electromagnet obtains electric, it is operated in right position, the oil of hydraulic fluid port T
Liquid is ended, and the fluid between hydraulic fluid port P and hydraulic fluid port A can flow freely.When the electromagnet of the pilot control valve 5 must not be electric,
It is operated in right position, the fluid of hydraulic fluid port P is ended, and the fluid between hydraulic fluid port A and hydraulic fluid port T can flow freely；Its electromagnet obtains
When electric, it is operated in left position, the fluid of hydraulic fluid port T is ended, and the fluid between hydraulic fluid port P and hydraulic fluid port A can flow freely.Described
Four reversal valves 13 are that 2/2-way solenoid directional control valve is operated in left position, the fluid of hydraulic fluid port P is cut when electromagnet must not be electric
Only, the fluid of hydraulic fluid port A can uniaxially flow to hydraulic fluid port T；When its electromagnet obtains electric, it is operated in right position, the fluid of hydraulic fluid port A can
Uniaxially to flow to hydraulic fluid port P, the fluid of hydraulic fluid port T is ended.Second reversal valve 8 is two four-way electromagnetic reversing valves,
Electromagnet must not electricity when, be operated in upper, the fluid between hydraulic fluid port P and hydraulic fluid port B can flow freely, between hydraulic fluid port T and hydraulic fluid port A
Fluid can flow freely；When its electromagnet obtains electric, it is operated in bottom, the fluid between hydraulic fluid port P and hydraulic fluid port A can be with free flow
Dynamic, the fluid between hydraulic fluid port T and hydraulic fluid port B can flow freely.
To improve sealing effect, the first reversal valve 7, third reversal valve 11, the 4th reversal valve 13 select ball-valve structure.It is special
Other, first reversal valve 7 is that 2/2-way solenoid directional control valve is operated in upper, hydraulic fluid port A when electromagnet must not be electric
Fluid can uniaxially flow to hydraulic fluid port P, reversed fluid is ended；When its electromagnet obtains electric, be operated in bottom, hydraulic fluid port P and
Fluid between hydraulic fluid port A forward and reverse can flow freely.The third reversal valve 11 is 2/2-way solenoid directional control valve, electromagnet
When must not be electric, it be operated in right position, the fluid of hydraulic fluid port P can uniaxially flow to hydraulic fluid port A, and reversed fluid is ended；Its electromagnet
When obtaining electric, it is operated in left position, the fluid between hydraulic fluid port P and hydraulic fluid port A forward and reverse can flow freely.
The specific work process of this system is as follows：
For weight lifts engineering, all it is to know height and load that needs lift in advance, at least may be used
With estimation.Accordingly, the impulse stroke and operating pressure of lifting hydraulic cylinder can first be calculated.It is set in controller 17 first
The pressure of the impulse stroke and system of good lifting hydraulic cylinder 12.
One, when lifting hydraulic cylinder 12 is not in contact with to the weight lifted, pressurized cylinder 9 does not play pressurization at this time.Control
Device 17 processed sends out control signal, the electromagnet 3YA of the electromagnet 5YA and the first reversal valve 7 that make lifting valve 3 obtain it is electric, lifting valve 3
The work of right position access system, the next access system work of the first reversal valve 7, at this time third reversal valve 11 not electric, holding work
Make in right position.It is as follows that lifting hydraulic cylinder 12 stretches out, small chamber filling liquid, the accumulator 114 of pressurized cylinder 8 fill energy motion process difference：
The fluid mobility status of lifting hydraulic cylinder 12 is：The effect that the fluid of fuel tank 4 flows through hydraulic pump 1 is input to lifting valve
3 P mouths are flowed out to A mouthfuls again, and the A mouths of the fluid input hydraulic control one-way valve 6 of the A mouths output of lifting valve 3 are flowed out to B mouthfuls again, hydraulic control
The P mouths that a fluid part for the B mouths output of check valve 6 is input to third reversal valve 11 are flowed out to A mouthfuls again, third reversal valve 11
The high-voltage oil liquid of A mouthfuls of output reaches the rodless cavity of lifting hydraulic cylinder 12, and then piston is pushed to be moved to rod chamber direction.And originally
A mouth of the fluid through pilot control valve 5 in 12 rodless cavity of lifting hydraulic cylinder is finally flowed back into T mouthfuls in fuel tank 4, lifting
The piston rod of hydraulic cylinder 12 stretches out.
The fluid mobility status of pressurized cylinder 9 is：Some fluid is defeated in the fluid of the B mouths output of hydraulic control one-way valve 6
Enter the P mouths to the first reversal valve 7, at this point, the first reversal valve 7 is operated in bottom, P mouthfuls of oil inlets are again through its A mouthfuls of output to second
The P mouths of reversal valve 8, at this point, the second reversal valve 8 not it is electric, be operated in it is upper, P mouthfuls of oil inlets through its B mouthfuls export and be input to
The A mouths of first check valve 10, the first check valve 10 B mouths output fluid in a part be input to pressurized cylinder 9 B mouths be connected to
Small chamber, A mouth of the fluid through the second reversal valve 8 being located at originally in 9 big chamber of pressurized cylinder flow to its T mouthfuls, and then into fuel tank.This
The piston of pressurized cylinder moves downward during a, small chamber filling liquid.
The fluid mobility status of accumulator 14：Another part in the fluid of the B mouths output of first check valve 10 is by the
Two check valves 16 are input to the T mouths of the 4th reversal valve 13, the 4th reversal valve 13 at this time not it is electric, be operated in left position, T mouthfuls into
The fluid entered is flowed into accumulator 14 through its A mouthfuls and carries out filling energy.
Two, after lifting hydraulic cylinder 12 is touched by lifting weight, and second pressure sensor 12-2 monitors lifting liquid
When oil liquid pressure in cylinder pressure 12 is higher than the certain proportion of setting value (such as 0.7), at this point, pressurized cylinder 9 starts to be pressurized, in lifting valve
The electromagnet 3YA of 3 electromagnet 5YA and the first reversal valve 7 obtain it is electric on the basis of, controller 17 send out control signal make second to change
Obtain electric, the right position access system of lifting valve 3 work to the electromagnet 1YA of valve 8, the next access system work of the first reversal valve 7,
The next access system of second reversal valve 8 works.Lifting hydraulic cylinder 12 stretches out, small chamber filling liquid, the accumulator 114 of pressurized cylinder 8 fill
Energy motion process difference is as follows：
The mobility status of the fluid of lifting hydraulic cylinder 12 is as previously described.
The fluid mobility status of pressurized cylinder 9 is：The effect that the fluid of fuel tank 4 flows through hydraulic pump 1 is input to the P of lifting valve 3
Mouthful and flow out to A mouthful, A mouth of the fluid through hydraulic control one-way valve 6 that the A mouths of lifting valve 3 export is to B mouthfuls, the B mouths of hydraulic control one-way valve 6
The fluid of output inputs the P mouths of the first reversal valve 7, and because the first reversal valve 7 is operated in bottom, P mouthfuls of feed liquors are defeated by its A mouthfuls again
Go out, P mouth of the fluid through the second reversal valve 8 of the A mouths output of the first reversal valve 7 is flowed out to A mouthfuls again, and the A mouths of the second reversal valve 8 are defeated
The fluid gone out enters the big chamber for reaching pressurized cylinder 9, and the piston of pressurized cylinder 9 moves right, and the fluid in its small intracavitary is pressurized
Output.
The fluid mobility status of accumulator 14：The supercharging fluid of 9 small intracavitary of pressurized cylinder enters the A mouths of the second check valve 16 simultaneously
The T mouths for entering the 4th reversal valve 13 through its B mouthfuls are flowed out to A mouthfuls again, and the fluid of the A mouths output of the 4th reversal valve 13 enters accumulator
14 actuator port, the accumulator 14 of high pressure oil inflow at this time, is filled energy again to it.
Three, after weight is given rise to suitable height, controller 17 controls all electromagnet power-off, 3 He of lifting valve
4th reversal valve is operated in left position, pilot control valve 5 and third reversal valve 11 and is operated in right position, the first reversal valve 7 and
Two reversal valves 8 are operated in upper, and the fluid in lifting hydraulic cylinder 12 is ended by third reversal valve at this time, and lifting hydraulic cylinder 12 will
Maintain the height of weight constant, meanwhile, controller 17 records the normal pressure P that lifting weight needs1。
Compensation work principle：In the case of no any operation, controller 17 is real by second pressure sensor 12-2
When monitor the operating pressure of lifting hydraulic cylinder 12, the pressure in lifting hydraulic cylinder 12 can work as lifting hydraulic cylinder because of leakage and environment etc.
When oil pressure drop-out value in 12 is more than certain certain value (such as 1MPa), controller 17 can pass through the electricity of the 4th reversal valve 13 of control
Magnet 2YA obtains electric, is allowed to the work of right position access system, in accumulator 14 high-voltage oil liquid can the A mouths through the 4th reversal valve 13 to P
Mouth flows into the P mouths of third reversal valve 11 to A mouthfuls, finally enters the big chamber of lifting hydraulic cylinder 12, the pressure in lifting hydraulic cylinder 12
Power is restored to normal pressure P1When, controller 17 makes the electromagnet 2YA power-off of the 4th reversal valve 13, the 4th reversal valve 13 be operated in
Left position, the fluid in accumulator 14 stop output outward, also stop supplementing to lifting hydraulic cylinder 12；First pressure sensor 15 is real
When monitoring 14 inner fluid of accumulator pressure and this signal is sent to controller 17, as long as there is enough high pressure oils in accumulator 14
Liquid, the pressure in lifting hydraulic cylinder 12 can be obtained by continuous supplement, you can avoid the occurrence of lifting hydraulic cylinder 12 sedimentation and
Unbalance loading problem between multiple lifting hydraulic cylinders 12.
It lifts work to complete, controller 17 makes the electromagnet 4YA of the electromagnet 6YA of pilot control valve 5, third reversal valve 11
Electric, the left position of pilot control valve 5, the left position of third reversal valve 11 and the 4th at this time are obtained with the electromagnet 2YA of the 4th reversal valve 13
The right position access system of reversal valve 13 works, and P mouth of the output fluid through pilot control valve 5 of hydraulic pump 1 is to A mouthfuls of outflows, in turn
Into the rod chamber of lifting hydraulic cylinder 12, while entering the control port X of hydraulic control one-way valve 6 (when the oil for acting on control port X
When hydraulic coupling is more than certain value, hydraulic control one-way valve 6 has the function of reverse-conducting, i.e., the fluid at its B mouthfuls can be flowed through its A mouthfuls
Go out), the sequence of flow of specific fluid is：The effect of fluid in fuel tank 4 through hydraulic pump 1 is into the P mouths of pilot control valve 5 to A
Mouth outflow, and then the rod chamber of lifting hydraulic cylinder 12 is flowed into, the fluid for being located at its rodless cavity originally enters the A of third reversal valve 11
Mouthful, because third reversal valve 11 is operated in left position, A mouthful oil inlets are through P mouthful outflows, then the mouths of the B through hydraulic control one-way valve 6 are to A mouthfuls of outflows,
The A mouths for then flowing into lifting valve 3, because lifting valve 3 at this time not it is electric, be operated in left position, A mouthfuls of oil inlets are flowed out through T mouthfuls, and then are returned
It is flow to fuel tank 4, the piston rod of lifting hydraulic cylinder 12 is retracted.
Meanwhile the 4th reversal valve 13 be operated in right position, remaining high-voltage oil liquid enters the 4th reversal valve 13 in accumulator 14
A mouths to P mouthfuls flow out, then mouths of the B through hydraulic control one-way valve 6 to A mouthful outflows, then the mouths of the A through lifting valve 3 to T mouthfuls inject fuel tanks 4.
Claims (6)
1. it is a kind of heavy duty lifting electrohydraulic control system, including hydraulic pump (1), lifting valve (3), fuel tank (4), pilot control valve (5),
Lifting hydraulic cylinder (12) and accumulator (14), which is characterized in that further include pressurized cylinder (9) and controller (17), the hydraulic pressure
Pump (1) oil inlet is connect by pipeline with fuel tank (4), oil outlet and the P mouths of lifting valve (3) and the P of pilot control valve (5)
Mouth connection；
The A mouths of lifting valve (3) are connect with the oil inlet of hydraulic control one-way valve (6), the oil outlet of the hydraulic control one-way valve (6) and lifting
The rodless cavity of hydraulic cylinder (12) connects；
The A mouths of the pilot control valve (5) connect with the rod chamber of the control mouth of hydraulic control one-way valve (6) and lifting hydraulic cylinder (12)
It connects；
It is provided with displacement sensor (12-1) and second pressure sensor (12-2) on the lifting hydraulic cylinder (12)；
The oil outlet of the hydraulic control one-way valve (6) is also connect with the P mouths of the 4th reversal valve (13) and T mouthfuls, in the connection with T mouthfuls
The first reversal valve (7), the second reversal valve (8), pressurized cylinder (9) and the second check valve (16) are serially connected on oil circuit；Described first changes
The P mouths of A mouths and the second reversal valve (8) to valve (7) are connect, the A mouths of the second reversal valve (8) and B mouthfuls respectively with pressurized cylinder (9)
The oil inlet connection of big chamber and the first check valve (10)；The oil outlet connection of the small chamber and the first check valve (10) of pressurized cylinder (9)
It is connected to afterwards with the oil inlet of the second check valve (16), the oil return opening of pressurized cylinder (9) is connected to fuel tank (4)；
The A mouths of 4th reversal valve (13) are connect with the actuator port of accumulator (14), and the actuator port of accumulator (14) is also
It is connected with first pressure sensor (15)；
The T mouths of the T mouths of the lifting valve (3), the T mouths of pilot control valve (5) and the second reversal valve (8) are connected to fuel tank (4)；
The first pressure sensor (15), displacement sensor (12-1), second pressure sensor (12-2), lifting valve (3)
Automatically controlled mouth, the automatically controlled mouth of pilot control valve (5), the automatically controlled mouth of the first reversal valve (7), the automatically controlled mouth of the second reversal valve (8) and
The automatically controlled mouth of four reversal valves (13) is connect with controller (17).
2. a kind of heavy duty lifting electrohydraulic control system according to claim 1, which is characterized in that the hydraulic control one-way valve
(6) third reversal valve (11), third reversal valve (11) are also serially connected between oil outlet and the rodless cavity of lifting hydraulic cylinder (12)
Automatically controlled mouth connect with controller (17).
3. a kind of heavy duty lifting electrohydraulic control system according to claim 1 or 2, which is characterized in that further include overflow valve
(2), the P mouths of the overflow valve (2) are connect with the oil outlet of hydraulic pump (1), and T mouthfuls connect with fuel tank (4).
4. a kind of heavy duty lifting electrohydraulic control system according to claim 3, which is characterized in that lifting valve (3), guide's control
Valve (5) processed and the 4th reversal valve (13) are two-bit triplet solenoid directional control valve.
5. a kind of heavy duty lifting electrohydraulic control system according to claim 4, which is characterized in that the second reversal valve (8) is
Two four-way electromagnetic reversing valves.
6. a kind of heavy duty lifting electrohydraulic control system according to claim 5, which is characterized in that the first reversal valve (7), the
Three reversal valves (11), the 4th reversal valve (13) are ball-valve structure.
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| CN107387468B (en) * | 2017-08-28 | 2023-07-07 | 福龙马集团股份有限公司 | Pilot energy-saving control system and control method for hydraulic oil way of garbage compressor |
| CN107620744B (en) * | 2017-09-22 | 2023-07-04 | 凯迈（洛阳）测控有限公司 | Self-adaptive control system and control method for lifting force of lifting mechanism of hanging bullet vehicle |
| CN108691853A (en) * | 2018-07-06 | 2018-10-23 | 孔庆潭 | A kind of device and method that gravitional force conversion recycles |
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