CN103527536B - Hydraulic motor governing system and speed regulating method, crane gear - Google Patents
Hydraulic motor governing system and speed regulating method, crane gear Download PDFInfo
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- CN103527536B CN103527536B CN201310499591.7A CN201310499591A CN103527536B CN 103527536 B CN103527536 B CN 103527536B CN 201310499591 A CN201310499591 A CN 201310499591A CN 103527536 B CN103527536 B CN 103527536B
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Abstract
The invention provides a kind of hydraulic motor governing system and speed regulating method, crane gear.This hydraulic motor governing system includes: the first hydraulic pump；Hydraulic motor, including port for drawdown and rising mouth；First reversal valve, is connected between hydraulic motor and the first hydraulic pump, and oil-in is connected to the first hydraulic pressure delivery side of pump, and the first actuator port is connected to the port for drawdown of hydraulic motor, and the second actuator port is connected to the rising mouth of hydraulic motor；Flow control valve, is connected on the fluid pressure line between the first reversal valve and hydraulic motor, controls to rise the hydraulic flow at mouth；Pressure control mechanism, is connected to the control end of flow control valve, controls the aperture of flow control valve；And controller, obtain the hydraulic flow of the first reversal valve, and control the aperture of pressure control mechanism regulation flow control valve according to this hydraulic flow.Hydraulic motor governing system according to the present invention, can effectively prevent hydraulic motor generation jitter phenomenon, improves hydraulic motor and hangs the security of load.
Description
Technical field
The present invention relates to hoisting machinery field, in particular to a kind of hydraulic motor governing system and speed regulating method, rise and reset
Standby.
Background technology
Crane hoisting mechanism is one of most important executing agency of crane, in order to adapt to various operating mode, such as low-speed heave-load, height
Speed underloading, and the requirement of fine lifting, need hoisting mechanism to have good operating characteristics and fine motion reliably.
Mostly the hoisting mechanism of crane is the fluid motor-driven loop of open type at present, arranges balanced valve in loop, and balanced valve controls
Oil circuit derives from motor and declines cavity pressure, and there is individual defect in this loop, if the unlatching pressure setting of balanced valve is less, in heavy duty work
Easily shaking under condition, arrange relatively big, energy loss is the most serious；When the port for drawdown repairing of hoist motor is insufficient simultaneously, system
Also it is susceptible to the harm that weight drawing motor rotates, is commonly called as " slip hook ", easily causes security incident.
As it is shown in figure 1, balanced valve 40 ' pilot pressure takes from the port for drawdown of hoist motor 20 ' in prior art.When hoisting mechanism declines,
The port for drawdown oil-feed of hoist motor 20 ', A mouth is fuel-displaced, and balanced valve 40 ' has different spool apertures according to the pressure size in B chamber,
Make motor two ends produce the pressure reduction that can overcome weight, thus realize speeds control.
Hanging in load crane is actual, even if lifted weight mass conservation, the moment of hoist motor 20 ' is as well as hoisting rope
The change of the number of plies and different, when, under high-speed overload operating mode, when crane rope is single multiplying power, hoist motor 20 ' moment variations is
Become apparent from.When handle control instruction change, the fluctuation of load or the steel wire rope number of plies change, cause under hoist motor 20 '
When fall mouth pressure reduces, the pilot control pressure of balanced valve 40 ' also will reduce, and balanced valve 40 ' spool is moved to the left, and valve core opening subtracts
Little；Otherwise, valve core opening increases.Visible, the spool aperture of balanced valve 40 ' can adjust with closed loop automatically according to B mouth pressure, flat
Weighing apparatus valve 40 ' spool is in the state of constantly regulation all the time, and this is balanced valve 40 ' control principle conventional in hoisting system.
Actually used discovery, when elevator heavy-duty low-speed hangs loads, balanced valve 40 ' guide's oil circuit declines this of chamber from motor
, often there is low jitter phenomenon, cause weight to hang load and there is potential safety hazard in loop.
Summary of the invention
It is desirable to provide a kind of hydraulic motor governing system and speed regulating method, crane gear, can effectively prevent hydraulic motor
There is jitter phenomenon, improve hydraulic motor and hang the security of load.
To achieve these goals, according to an aspect of the invention, it is provided a kind of hydraulic motor governing system, including: the
One hydraulic pump；Hydraulic motor, including port for drawdown and rising mouth；First reversal valve, the first reversal valve is connected to hydraulic motor and
Between one hydraulic pump, the oil-in of the first reversal valve is connected to the first hydraulic pressure delivery side of pump, the first working oil of the first reversal valve
Mouth is connected to the port for drawdown of hydraulic motor, and the second actuator port of the first reversal valve is connected to the rising mouth of hydraulic motor；Flow control
Valve processed, is connected on the second actuator port of the first reversal valve and the fluid pressure line risen between mouth of hydraulic motor, controls to rise
Hydraulic flow at Kou；Pressure control mechanism, is connected to the control end of flow control valve, controls the aperture of flow control valve；With
And controller, obtain the hydraulic flow of the first reversal valve, and control pressure control mechanism regulation flow-control according to this hydraulic flow
The aperture of valve.
Further, pressure control mechanism includes being connected to second hydraulic pump controlling end of flow control valve, the second hydraulic pump with
It is provided with pressure-control valve on fluid pressure line between flow control valve.
Further, hydraulic motor governing system also includes the brakes of brake fluid pressure motor, and brakes includes checking cylinder,
Checking cylinder is connected to the second hydraulic pump, and the fluid pressure line between checking cylinder and the second hydraulic pump is provided with the second reversal valve.
Further, in the fluid pressure line between the second reversal valve and the second hydraulic pump being provided with accumulator and prevents accumulator
Hydraulic oil reverse flow to the check valve of the second hydraulic pump.
Further, hydraulic motor governing system also includes pressure detection mechanism, the decline of pressure detection mechanism detection hydraulic motor
Mouthful pressure, controller is locked or unlocking hydraulic pressure motor according to the Stress control checking cylinder of the port for drawdown of hydraulic motor.
According to a further aspect in the invention, it is provided that the speed regulating method of a kind of hydraulic motor, including: set up hydraulic motor decline
Mouth pressure；The hydraulic flow of the first reversal valve is obtained by controller；Controller controls pressure according to the hydraulic flow of the first reversal valve
The aperture of power controlling organization regulation flow control valve, makes the hydraulic flow of flow control valve and the hydraulic flow phase of the first reversal valve
Join, so that the port for drawdown pressure of hydraulic motor is maintained in default scope.
Further, pressure control mechanism includes the second hydraulic pump and the pressure-control valve being connected to flow control valve, controller root
The step controlling the aperture that pressure control mechanism regulates flow control valve according to the hydraulic flow of the first reversal valve includes: control the second liquid
Press pump is to flow control valve output hydraulic pressure oil；Controller regulates pressure-control valve output to stream according to the hydraulic flow of the first reversal valve
The hydraulic fluid pressure controlling end of control valve, to regulate the aperture of flow control valve.
Further, elevator declines the brakes that control system also includes braking this hydraulic motor, and this brakes includes braking
Cylinder, the step of the port for drawdown pressure setting up hydraulic motor includes: closes checking cylinder and flow control valve, makes checking cylinder brake fluid pressure
Motor；Control first hydraulic pump port for drawdown output hydraulic pressure oil to hydraulic motor, make the port for drawdown hydraulic fluid pressure of hydraulic motor reach
To preset pressure；Open checking cylinder and flow control valve.
Further, speed regulating method also includes: the port for drawdown pressure of controller detection hydraulic motor, is presetting when declining mouth pressure
Time between pressure and minimum setting value, the aperture of controller regulation flow control valve, make port for drawdown pressure reach preset pressure；When
When port for drawdown pressure is less than minimum setting value, controller cuts out checking cylinder, makes checking cylinder brake fluid pressure motor.
In accordance with a further aspect of the present invention, it is provided that a kind of crane gear, including hydraulic motor governing system, this hydraulic motor is adjusted
Speed system is above-mentioned hydraulic motor governing system.
Application technical scheme, hydraulic motor governing system includes flow control valve and controls opening of this flow control valve
The pressure control mechanism of degree, in the elevator governing system course of work, can pass through in the case of setting up hoist motor pressure
The aperture of control flow control valve regulates the relation between hydraulic pressure oil mass and the hydraulic flow of flow control valve of the first reversal valve,
Make the hydraulic pressure oil mass of the first reversal valve and the hydraulic flow of flow control valve match, thus control the pressure of the port for drawdown of motor elevator
Power, prevents the port for drawdown of hoist motor from the phenomenon that pressure is excessive or too small occur, it is ensured that the security of elevator governing system.
Accompanying drawing explanation
The accompanying drawing of the part constituting the present invention is used for providing a further understanding of the present invention, the illustrative examples of the present invention and
Its explanation is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of hydraulic motor governing system of the prior art；
Fig. 2 shows the structural representation of hydraulic motor governing system according to an embodiment of the invention；
Fig. 3 shows the controller control principle drawing of hydraulic motor governing system according to an embodiment of the invention；And
Fig. 4 shows the speed governing flow chart of hydraulic motor governing system according to an embodiment of the invention.
Reference: 10, the first hydraulic pump；20, hydraulic motor；30, the first reversal valve；40, flow control valve；50、
Pressure control mechanism；60, controller；70, feedback oil circuit；80, brakes；51, the second hydraulic pump；52, pressure control
Valve processed；81, checking cylinder；82, the second reversal valve；83, accumulator；84, check valve.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that in the case of not conflicting,
Embodiment in the application and the feature in embodiment can be mutually combined.
As shown in Figures 2 and 3, according to embodiments of the invention, hydraulic motor governing system includes the first hydraulic pump 10, hydraulic pressure
Motor the 20, first reversal valve 30, flow control valve 40, pressure control mechanism 50 and controller 60.Hydraulic motor 20 wraps
Include for controlling rising mouth A and the port for drawdown B that weight rises or declines.First reversal valve 30 is connected to hydraulic motor 20 He
Between first hydraulic pump 10, the oil-in of the first reversal valve 30 is connected to the output of the first hydraulic pump 10, the first reversal valve 30
The first actuator port be connected to the port for drawdown B of hydraulic motor 20, the second actuator port of the first reversal valve 30 is connected to hydraulic pressure horse
Reach the rising mouth A of 20.Flow control valve 40 is connected to the liquid between the second actuator port of the first reversal valve 30 and rising mouth A
On pressure pipe road, control to rise the hydraulic flow at mouth A.Pressure control mechanism 50 is connected to the control end of flow control valve 40,
Control the aperture of flow control valve 40.Controller 60 is used for obtaining the hydraulic flow of the first reversal valve 30, and according to this flow of pressurized
Amount controls pressure control mechanism 50 and regulates the aperture of flow control valve 40.
Preferably, in the present embodiment, the first hydraulic pump 10 is load-reacting pump, and hydraulic motor governing system also includes instead
Feedback oil circuit 70, hydraulic oil bigger for pressure in the rising mouth A and port for drawdown B of hydraulic motor 20 is fed back to bear by feedback oil circuit 70
Carry the feedback end of sensitive variable pump.Delivery outlet at load-reacting pump connects overflow relief valve, hydraulic motor 20 times
Fall mouth B connects has port for drawdown B overflow valve, so that whole hydraulic motor governing system has safer serviceability.Instead
Feedback oil circuit 70 includes shuttle valve, and the first of shuttle valve is compared mouth and be optionally connected to the first actuator port of the first reversal valve 30, shuttle
The second of valve is compared mouth and is optionally connected to the second actuator port of the first reversal valve 30, and the delivery outlet of shuttle valve is connected to load quick
The feedback end of sense variable pump.During hydraulic motor governing system works, feed back the upper of oil circuit 70 comparison liquid pressure motor 20
Rise mouth A and the hydraulic fluid pressure of port for drawdown B, then hydraulic oil bigger for pressure is fed back to load-reacting pump, load quick
Sense variable pump adjusts output hydraulic pressure oil pressure according to the pressure of feedback, makes rising mouth A or the liquid of port for drawdown B of hydraulic motor 20
Oil pressure reaches job requirement.
Preferably, the first reversal valve 30 is proportional multi-way valve, and in the present embodiment, the first reversal valve 30 is three seven energising magnetic
Proportioning valve, these three seven lead to electromagnetic proportional valve and include two oil-ins, two oil return openings and four actuator ports, the first working oil
Mouthful and the second actuator port connect with the port for drawdown B of hydraulic motor 20 and rising mouth A respectively, the of the 3rd actuator port and shuttle valve
One compares mouth connection, and the 4th actuator port compares mouth connection with the second of shuttle valve, and two oil-ins are connected to the first hydraulic pump 10,
Two oil return openings are connected to fuel tank.
When three seven lead to electromagnetic proportional valve be positioned at left station time, oil-in and the second actuator port connection, the first actuator port with return
Hydraulic fluid port connects, the 4th actuator port and the connection of the second actuator port, and the 3rd actuator port cuts out, and flow control valve 40 is at hydraulic oil
Effect under open, hydraulic oil enters the rising mouth A of hydraulic motor 20 through the second actuator port, and from hydraulic motor 20
Fall mouth B flows back to fuel tank through the first actuator port and oil return opening, and now weight is in normal ascent stage, enters hydraulic motor 20
The hydraulic fluid pressure of rising mouth A be fed back to the feedback end of load-reacting pump, load-reacting by feedback oil circuit 70
The output pressure that pump feeds back to adjust hydraulic oil according to this, makes the hydraulic fluid pressure of the rising mouth A of hydraulic motor 20 reach requirement.
When three seven lead to electromagnetic proportional valve be positioned at right working position time, oil-in and the first actuator port connection, the second actuator port with return
Hydraulic fluid port connects, the 3rd actuator port and the connection of the first actuator port, and the 4th actuator port cuts out, and now hydraulic oil is from oil-in warp
First actuator port enters the port for drawdown B of hydraulic motor 20, then through the rising mouth A of hydraulic motor 20, the second actuator port and
Oil return opening flows back to fuel tank.Now weight is in the decline stage, enters the hydraulic fluid pressure of port for drawdown B of hydraulic motor 20 by anti-
Feedback oil circuit 70 is fed back to the feedback end of load-reacting pump, and load-reacting pump feeds back to adjust the defeated of hydraulic oil according to this
Go out pressure, make the hydraulic fluid pressure of the port for drawdown B of hydraulic motor 20 reach requirement.The aperture of flow control valve 40 is stressed control
The control of mechanism 50 processed, pressure control mechanism 50 adjusts flow control according to the hydraulic fluid pressure of the port for drawdown B of hydraulic motor 20
The aperture size of valve 40 processed, thus regulation is through the hydraulic flow of flow control valve 40, reaches to control the decline of hydraulic motor 20
The purpose of the hydraulic fluid pressure of mouth B.Due to pressure control mechanism 50 all the time according to the port for drawdown B measuring the hydraulic motor 20 arrived
Hydraulic fluid pressure adjust the hydraulic flow of flow control valve 40, therefore can make the hydraulic pressure of the port for drawdown B of hydraulic motor 20
Oil pressure is in a dynamic balance state, it is possible to effectively prevent the hydraulic fluid pressure of the port for drawdown B of hydraulic motor 20 excessive or
The phenomenons such as too small caused shake, are effectively improved the security performance of hydraulic motor governing system.
Preferably, pressure control mechanism 50 includes the second hydraulic pump 51 controlling end being connected to flow control valve 40, the second liquid
Pressure-control valve 52 it is provided with on fluid pressure line between press pump 51 and flow control valve 40.In order to prevent at pressure control mechanism
In 50 courses of work, hydraulic fluid pressure exceeds safe pressure, and pressure control mechanism 50 also includes that is connected to second hydraulic pump
The overflow valve of the port of export of 51.In the present embodiment, this flow control valve 40 is pilot-operated type balanced valve, including balanced valve and for
Controlling the electric proportional pressure control valve of balanced valve aperture, electric proportional pressure control valve here i.e. plays the effect of pressure-control valve 52, Er Qie electricity
Proportional control valve can more precisely control the aperture of balanced valve, it is possible to makes pressure control mechanism 50 more accurately through balanced valve
Hydraulic flow.
Hydraulic motor governing system also includes the brakes 80 of brake fluid pressure motor 20, and brakes 80 includes checking cylinder 81,
Checking cylinder 81 is connected to the second hydraulic pump 51, the fluid pressure line between checking cylinder 81 and the second hydraulic pump 51 is provided with second and changes
To valve 82, this second reversal valve 82 is two-bit triplet reversal valve, and checking cylinder can be by this two-bit triplet reversal valve and the second hydraulic pressure
Pump 51 connects or is connected directly to oil return box, thus realizes braking or unlock two states.This brakes 80 can also
It is connected to an independent hydraulic oil source of supply.First hydraulic pump 10 of the present embodiment and the second hydraulic pump 51 are by a rotation
Axle concatenates, and is commonly connected to drive motor, it is achieved a motor drives two hydraulic pumps to rotate, and therefore can save space, fall
Low cost.
Preferably, the fluid pressure line between the second reversal valve 82 and the second hydraulic pump 51 it is provided with accumulator 83 and prevents from storing
Can hydraulic oil reverse flow in device 83 to the check valve 84 of the second hydraulic pump 51.Second hydraulic pump is carrying liquid to checking cylinder 81
During force feed, also in accumulator 83, delivery hydraulic pressure is oily simultaneously, makes hydraulic fluid pressure be accumulated in accumulator 83.Check valve 84 can
During to prevent the hydraulic oil release pressure in accumulator 83, hydraulic oil reverse flow is to the second hydraulic pump 51 so that accumulator can
Quickly discharge hydraulic energy to checking cylinder 81, it is ensured that checking cylinder can the Rapid reversal braking to hydraulic motor 20.
Hydraulic motor governing system also includes pressure detection mechanism, the pressure of the port for drawdown B of pressure detection mechanism detection hydraulic motor 20
Power, controller 60 is locked or unlocking hydraulic pressure motor 20 according to the Stress control checking cylinder 81 of the port for drawdown B of hydraulic motor 20.
Requirement is declined, it is ensured that when weight declines the most safely when the port for drawdown B pressure of the hydraulic motor 20 detected meets weight,
Controller 60 just controls checking cylinder 81 and releases the braking to hydraulic motor 20 so that hydraulic motor 20 can drive weight to decline.
When the port for drawdown B pressure of the hydraulic motor 20 detected requires less than the minimum pressure that weight declines safely, then controller 60
Just control checking cylinder 81 hydraulic motor 20 is braked, prevent weight from dragging hydraulic motor 20 and rotate and cause security incident.
According to a further aspect in the invention, it is provided that the speed regulating method of a kind of hydraulic motor governing system, this speed regulating method includes:
Set up the port for drawdown B pressure of hydraulic motor 20；The hydraulic flow of the first reversal valve 30 is obtained by controller 60；Controller 60
Hydraulic flow according to the first reversal valve 30 controls pressure control mechanism 50 and regulates the aperture of flow control valve 40, makes flow-control
The hydraulic flow of valve 40 and the hydraulic flow of the first reversal valve 30 match, and make the port for drawdown B pressure of hydraulic motor 20 be maintained at
In the scope preset.
Controller 60 controls pressure control mechanism 50 according to the hydraulic flow of the first reversal valve 30 and regulates opening of flow control valve 40
The step of degree includes: control the second hydraulic pump 51 to flow control valve 40 output hydraulic pressure oil；Controller 60 is according to the first reversal valve
The hydraulic flow regulation pressure-control valve 52 of 30 exports the hydraulic fluid pressure controlling end to flow control valve 40, to regulate flow
The aperture of control valve 40.
In this step, controller 60 sends control instruction and controls to flow to three seven electric currents leading to electromagnetic proportional valve, makes three
Seven lead to the spool of electromagnetic proportional valve there is displacement x under the effect of electromagnetic force1, now main valve flow Q1It is calculated by formula 1:
C hereinQFor the discharge coefficient of hydraulic oil, ρ is the density of hydraulic oil, and △ p is the setting pressure reduction of load-reacting pump,
A1It is three the seven valve port area of passages leading to electromagnetic proportional valve.
A1Can be calculated by formula 2 and obtain:
Wherein, W is three the seven area of passage gradients leading to electromagnetic proportional valve, △1For the radial clearance between valve body and spool.
Above-mentioned CQ、ρ、△1, W be definite value.
When determining spool displacement x1Time main valve (three seven lead to electromagnetic proportional valve) flow Q1Afterwards, it is possible to according to formula 3 and 4
Calculate the area of passage A of balanced valve valve port2, thus realize three seven hydraulic flows leading to electromagnetic proportional valve and balance valve flow phase
The purpose of coupling, concrete formula is as follows:
Q2=Q1-Qυ-Qd (3)
Wherein, Q2For balanced valve necessary flow, PCFor balanced valve C mouth pressure, PAThe pressure at mouth A is risen for hoist motor,
QvFor leakage flow, QdFor the overflow valve flooded traffic at the port for drawdown B of hoist motor.
From formula 3, if ignoring leakage flow Qv, and the hydraulic fluid pressure at the port for drawdown B of hoist motor not by with under
The overflow valve that fall mouth B is connected is set up, and the most there is not flooded traffic Qd, now, main valve flow Q1With balance valve flow Q2Equal.
Many increases by one parameter Q hereind, it being mainly based upon security consideration, this partial discharge is by overflowing at the port for drawdown B of hydraulic motor 20
Stream valve overflows, and this moment, the falling pressure of hydraulic motor 20 is set up by the overflow valve at port for drawdown B.
Area of passage A due to balanced valve2And becoming corresponding relation between balance valve core displacement, balanced valve spool displacement again and balances
Valve guide proportion electromagnet current value is in proportion, and therefore just can be obtained the leader current size of balanced valve by above method.
By calculated equilibrium valve guide proportion electromagnet current size, mate rolling control valve flow, make rolling control valve flow peace
Weighing apparatus valve flow matches, it is possible to when avoiding flow not mate, the phenomenon that the port for drawdown B pressure of hydraulic motor 20 is excessive or too small.
Guide's oil circuit of balanced valve is declined chamber oil circuit independent of motor by above-mentioned speed regulating method, and balanced valve pilot pressure uses external control
Mode declines loop to elevator and carries out speed governing, on this basis, it is proposed that control the guide of balanced valve by the way of calculated flow rate
Pressure, realizes the coupling of main valve flow and balance valve flow, uses certain algorithm and SECO, it is ensured that under motor simultaneously
Fall cavity pressure is maintained at the scope of permission, such that it is able to effectively solve elevator to decline the shake of low-speed heave-load, it is ensured that governing system
Trouble free service.
Preferably, the step of the port for drawdown B pressure setting up hydraulic motor 20 includes: close checking cylinder 81 and flow control valve 40,
Make checking cylinder 81 brake fluid pressure motor 20；Control the first hydraulic pump 10 port for drawdown B output hydraulic pressure oil to hydraulic motor 20, make
The port for drawdown B hydraulic fluid pressure of hydraulic motor 20 reaches preset pressure；Open checking cylinder 81 and flow control valve 40.
Preferably, speed regulating method also includes: controller 60 detects the port for drawdown B pressure of hydraulic motor 20, when port for drawdown B presses
When power is between preset pressure and minimum setting value, controller 60 regulates the aperture of flow control valve 40, makes port for drawdown B pressure
Reach preset pressure；When port for drawdown B pressure is less than minimum setting value, controller 60 cuts out checking cylinder 81, makes checking cylinder 81
Brake fluid pressure motor 20.
Fig. 3 is controller control block diagram, and Fig. 4 is the speed governing flow chart of hydraulic motor governing system.Below in conjunction with Fig. 3 and Fig. 4
Introduce the course of work of the hydraulic motor governing system of the present invention:
Operator sends elevator by operation handle and declines instruction, and according to instruction, to main valve, (three seven lead to solenoid-operated proportional to controller 60
Valve) send control current value, make valve core of main valve move.When elevator main valve right-hand member proportion electro-magnet obtains electric, the right position of spool works,
Load-reacting transport pump pressure oil enters the port for drawdown B of hydraulic motor 20, and the rising mouth A fluid of hydraulic motor 20 is through flat
Fuel tank is flowed back to after weighing apparatus valve, main valve.Shuttle valve is by the port for drawdown B pressure acquisition of hydraulic motor 20 and feeds back to load-reacting pump,
Load-reacting pump is made to regulate the port for drawdown B pressure of hydraulic motor 20 accordingly.From figure 3, it can be seen that controller acquisition operations
The handle input instruction of person, rising mouth A pressure, the port for drawdown B pressure of hydraulic motor 20 and the balanced valve of hydraulic motor 20
C mouth pressure, judge through prespecified algorithm and sequential logic, by controlling the unlatching of checking cylinder 81, regulation main valve
Proportion electro-magnet input current value and the mode of balanced valve guide proportion electromagnet input current value, it is achieved elevator main valve and balanced valve
Flow matches, and reach safety control strategy.
During elevator declines, the hydraulic oil of load-reacting pump connects the port for drawdown B of hydraulic motor 20, in the incipient stage
Time checking cylinder 81 and balanced valve do not open, system pressure increases rapidly, and the port for drawdown B pressure of hydraulic motor 20 increases therewith,
When pressure reaches preset value, the checking cylinder 81 of hydraulic motor 20 is opened, and otherwise, hydraulic motor 20 continues to do at pressurising
Reason, until the port for drawdown B pressure of hydraulic motor 20 reaches predetermined set value.After checking cylinder 81 is opened, controller 60 is according to volume
Raising the open condition of main valve, the guide proportion electromagnet balancing valve by the way of above-mentioned calculated flow rate sends certain electric current,
It is now the flow rate calculation by elevator main valve due to balanced valve spool displacement size, the therefore port for drawdown B of hydraulic motor 20
Pressure set by the overflow valve that is connected with port for drawdown B.
Controller 60 detects the port for drawdown B pressure of hydraulic motor 20 all the time by pressure detection mechanism, if hydraulic motor 20 times
When fall mouth B pressure is declined by ectocine, then control as follows according to the change of the port for drawdown B pressure of hydraulic motor 20:
When port for drawdown B pressure drops to preset value, but when being more than the minimum setting value of governing system, controller 60 can be by advising in advance
Set pattern then, reduces the proportion electro-magnet current value of balanced valve, and balanced valve opening will reduce, owing to now main valve aperture does not has
Changing, therefore main valve flow does not the most reduce, and the port for drawdown B pressure of hydraulic motor 20 quickly will increase, and reach at port for drawdown B
Overflow valve set up pressure, make the pressure of port for drawdown B reach setting.When the port for drawdown B pressure of hydraulic motor 20 is less than adjusting
During the minimum setting value of speed system, then controller 60 controls checking cylinder 81 and is braked hydraulic motor 20, prevent it may happen that
Elevator " slip hook ", thus avoid security incident.
According to embodiments of the invention, crane gear includes hydraulic motor governing system, and this hydraulic motor governing system is above-mentioned
Hydraulic motor governing system.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
1, guide's oil circuit of balanced valve is declined chamber oil circuit independent of motor by the present invention, and balanced valve pilot pressure uses the mode of external control
Elevator is declined loop and carries out speed governing, determine balanced valve guide proportion electromagnet current by the method for calculated flow rate, mate elevator
The flow of control valve, to realize controlling the purpose of motor port for drawdown pressure so that it is be unlikely to excessive or too small, thus prevent hydraulic pressure
There is jitter phenomenon during motor operations, improve hydraulic motor and hang the security of load.
2, in the whole course of work of elevator governing system, hoist motor port for drawdown pressure is all detected by controller, and makes
Corresponding safety control strategy, is prevented effectively from the security incident of contingent elevator " slip hook ", and security of system increases.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art
For, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of being made, etc.
With replacement, improvement etc., should be included within the scope of the present invention.
Claims (6)
1. a hydraulic motor governing system, it is characterised in that including:
First hydraulic pump (10)；
Hydraulic motor (20), including port for drawdown and rising mouth；
First reversal valve (30), described first reversal valve (30) is connected to described hydraulic motor (20) and described first liquid
Between press pump (10), the oil-in of described first reversal valve (30) is connected to the output of described first hydraulic pump (10)
End, the first actuator port of described first reversal valve (30) is connected to the port for drawdown of described hydraulic motor (20), described
Second actuator port of the first reversal valve (30) is connected to the rising mouth of described hydraulic motor (20)；
Flow control valve (40), is connected to the second actuator port and the described hydraulic motor (20) of described first reversal valve (30)
The fluid pressure line risen between mouth on, control the hydraulic flow at described rising mouth；
Pressure control mechanism (50), is connected to the control end of described flow control valve (40), controls described flow control valve
(40) aperture；And
Controller (60), obtains the hydraulic flow of described first reversal valve (30), and controls according to this hydraulic flow described
Pressure control mechanism (50) regulates the aperture of described flow control valve (40)；
Described pressure control mechanism (50) includes the second hydraulic pump (51) controlling end being connected to described flow control valve (40),
Pressure-control valve (52) it is provided with on fluid pressure line between described second hydraulic pump (51) and described flow control valve (40)；
Described hydraulic motor governing system also includes the brakes (80) braking described hydraulic motor (20), described braking
System (80) includes that checking cylinder (81), described checking cylinder (81) are connected to described second hydraulic pump (51), described braking
The second reversal valve (82) it is provided with on fluid pressure line between cylinder (81) and described second hydraulic pump (51)；
It is provided with accumulator (83) on fluid pressure line between described second reversal valve (82) and described second hydraulic pump (51)
And prevent the hydraulic oil reverse flow in described accumulator (83) to the check valve (84) of described second hydraulic pump (51)；
Described hydraulic motor governing system also includes pressure detection mechanism, and described pressure detection mechanism detects described hydraulic motor
(20) pressure of port for drawdown, described controller (60) is according to the pressure control of the port for drawdown of described hydraulic motor (20)
Make described checking cylinder (81) locked or unlock described hydraulic motor (20).
2. the speed regulating method of a hydraulic motor, it is characterised in that including:
Set up the port for drawdown pressure of hydraulic motor (20)；
The hydraulic flow of the first reversal valve (30) is obtained by controller (60)；
Controller (60) controls pressure control mechanism (50) regulation flow according to the hydraulic flow of the first reversal valve (30)
The aperture of control valve (40), makes hydraulic flow and the hydraulic flow of the first reversal valve (30) of flow control valve (40)
Match, so that the port for drawdown pressure of hydraulic motor (20) is maintained in default scope.
Speed regulating method the most according to claim 2, it is characterised in that pressure control mechanism (50) includes being connected to described stream
Second hydraulic pump (51) of control valve (40) and pressure-control valve (52), described controller (60) changes according to first
The step bag of the aperture of pressure control mechanism (50) regulation flow control valve (40) is controlled to the hydraulic flow of valve (30)
Include:
Control the second hydraulic pump (51) to flow control valve (40) output hydraulic pressure oil；
Controller (60) regulates pressure-control valve (52) according to the hydraulic flow of the first reversal valve (30) and exports to flow
The hydraulic fluid pressure controlling end of control valve (40), to regulate the aperture of flow control valve (40).
Speed regulating method the most according to claim 2, it is characterised in that elevator declines control system and also includes braking this hydraulic pressure horse
Reaching the brakes (80) of (20), this brakes (80) includes checking cylinder (81), described setting hydraulic motor (20)
The step of port for drawdown pressure include:
Close checking cylinder (81) and flow control valve (40), make checking cylinder (81) brake fluid pressure motor (20)；
Control the first hydraulic pump (10) the port for drawdown output hydraulic pressure oil to hydraulic motor (20), make hydraulic motor (20)
Port for drawdown hydraulic fluid pressure reach preset pressure；
Open checking cylinder (81) and flow control valve (40).
Speed regulating method the most according to claim 4, it is characterised in that described speed regulating method also includes:
The port for drawdown pressure of controller (60) detection hydraulic motor (20), when declining mouth pressure in preset pressure and minimum
Time between setting value, the aperture of controller (60) regulation flow control valve (40), make port for drawdown pressure reach to preset pressure
Power；
When declining mouth pressure less than minimum setting value, controller (60) cuts out checking cylinder (81), makes checking cylinder (81)
Brake fluid pressure motor (20).
6. a crane gear, including hydraulic motor governing system, it is characterised in that described hydraulic motor governing system is that right is wanted
Seek the hydraulic motor governing system described in 1.
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