CN103527536A - System and method for hydraulic motor speed regulation and hoisting device - Google Patents

System and method for hydraulic motor speed regulation and hoisting device Download PDF

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Publication number
CN103527536A
CN103527536A CN201310499591.7A CN201310499591A CN103527536A CN 103527536 A CN103527536 A CN 103527536A CN 201310499591 A CN201310499591 A CN 201310499591A CN 103527536 A CN103527536 A CN 103527536A
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China
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oil hydraulic
pressure
hydraulic motor
valve
control
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CN201310499591.7A
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Chinese (zh)
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CN103527536B (en
Inventor
李迎兵
刘伟
李英智
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中联重科股份有限公司
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Abstract

The invention provides a system and method for hydraulic motor speed regulation and a hoisting device. The system for hydraulic motor speed regulation comprises a first hydraulic pump, a hydraulic motor comprising a declining opening and a lifting opening, a first reversing valve, a flow control valve, a pressure control mechanism and a controller, wherein the first reversing valve is connected between the hydraulic motor and the first hydraulic pump, an oil inlet is connected to the output end of the first hydraulic pump, a first operation oil opening is connected to the declining opening of the hydraulic motor, a second operation oil opening is connected to the lifting opening of the hydraulic motor, the flow control valve is connected to a hydraulic pipeline between the first reversing valve and the hydraulic motor and used for controlling the hydraulic flow of the lifting opening position, the pressure control mechanism is connected to the control end of the flow control valve and used for controlling the opening degree of the flow control valve, the hydraulic flow of the first reversing valve is obtained through the controller, and the opening degree of the flow control valve is adjusted through the method that the pressure control mechanism is controlled by the controller according to the hydraulic flow. According to the system for hydraulic motor speed regulation, the phenomenon of shaking of the hydraulic motor is effectively prevented and the safety of suspended load of the hydraulic motor is improved.

Description

Oil hydraulic motor speed control system and speed regulating method, crane gear
Technical field
The present invention relates to Hoisting Machinery field, in particular to a kind of oil hydraulic motor speed control system and speed regulating method, crane gear.
Background technique
Crane hoisting mechanism is one of most important actuator of hoist, in order to adapt to various operating modes, and as low-speed heave-load, high speed light loading, and the requirement of meticulous lifting, need hoisting mechanism to there is good operating characteristics and fine motion reliably.
Mostly the hoisting mechanism of hoist is the fluid motor-driven loop of open type at present, equilibrium valve is set in loop, equilibrium valve oil circuit control derives from motor decline cavity pressure, there is individual defect in this loop, if it is less that the cracking pressure of equilibrium valve arranges, under severe duty, easily shake, arranges greatlyr, and energy loss is comparatively serious; When simultaneously the port for drawdown repairing of hoist motor is insufficient, also easily there is the harm of weight drawing motor rotation in system, is commonly called as " slip hook ", easily causes security incident.
As shown in Figure 1, in prior art, equilibrium valve 40 ' pilot pressure is taken from the port for drawdown of hoist motor 20 '.When hoisting mechanism declines, the port for drawdown oil-feed of hoist motor 20 ', A mouth is fuel-displaced, and equilibrium valve 40 ' has different spool apertures according to the pressure size in B chamber, motor two ends are produced and can overcome the pressure reduction of weight, thereby the speed that realizes is controlled.
Actual the hanging of hoist, carry, even lifted weight mass conservation, the moment of hoist motor 20 ' also can be along with the variation of the hoisting rope number of plies difference, under high-speed overload operating mode, when crane rope is single multiplying power, hoist motor 20 ' moment variations is for more obvious.When handle control command changes, the fluctuation of load or the wire rope number of plies change, when the port for drawdown pressure that causes hoist motor 20 ' reduces, the pilot control pressure of equilibrium valve 40 ' also will reduce, equilibrium valve 40 ' spool is moved to the left, valve core opening reduces; Otherwise valve core opening increases.Visible, the spool aperture of equilibrium valve 40 ' can closed loop be adjusted automatically according to B mouth pressure, and equilibrium valve 40 ' spool is in the state of continuous adjusting all the time, and this is equilibrium valve 40 ' control principle conventional in hoisting system.
Actual use find, when elevator heavy-duty low-speed hangs loads, equilibrium valve 40 ' guide's oil circuit, from this loop in motor decline chamber, tends to occur low jitter phenomenon, causes weight to hang carrying having potential safety hazard.
Summary of the invention
The present invention aims to provide a kind of oil hydraulic motor speed control system and speed regulating method, crane gear, can effectively prevent oil hydraulic motor generation jitter phenomenon, improves oil hydraulic motor and hangs the Security of carrying.
To achieve these goals, according to an aspect of the present invention, provide a kind of oil hydraulic motor speed control system, having comprised: the first oil hydraulic pump; Oil hydraulic motor, comprises port for drawdown and the mouth that rises; The first selector valve, the first selector valve is connected between oil hydraulic motor and the first oil hydraulic pump, the filler opening of the first selector valve is connected to the first hydraulic pressure delivery side of pump, the first actuator port of the first selector valve is connected to the port for drawdown of oil hydraulic motor, and the second actuator port of the first selector valve is connected to the rising mouth of oil hydraulic motor; Flow control valve, is connected on the hydraulic pipe line between the second actuator port of the first selector valve and the rising mouth of oil hydraulic motor, controls mouthful hydraulic flow at place that rises; 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 selector valve, and according to the aperture of this hydraulic flow pilot pressure control mechanism adjust flux control valve.
Further, pressure control mechanism comprises the second oil hydraulic pump of the control end that is connected to flow control valve, on the hydraulic pipe line between the second oil hydraulic pump and flow control valve, is provided with pressure controlled valve.
Further, oil hydraulic motor speed control system also comprises the braking system of brake fluid pressure motor, and braking system comprises master cylinder, and master cylinder is connected to the second oil hydraulic pump, on the hydraulic pipe line between master cylinder and the second oil hydraulic pump, is provided with the second selector valve.
Further, the one-way valve that is provided with accumulator on the hydraulic pipe line between the second selector valve and the second oil hydraulic pump and prevents hydraulic oil reverse flow to the second oil hydraulic pump in accumulator.
Further, oil hydraulic motor speed control system also comprises pressure detection mechanism, and pressure detection mechanism detects the pressure of the port for drawdown of oil hydraulic motor, and controller is locked or unlocking hydraulic pressure motor according to the pressure control master cylinder of the port for drawdown of oil hydraulic motor.
According to a further aspect in the invention, provide a kind of speed regulating method of oil hydraulic motor, having comprised: the port for drawdown pressure of setting up oil hydraulic motor; By controller, obtain the hydraulic flow of the first selector valve; Controller is according to the aperture of the hydraulic flow pilot pressure control mechanism adjust flux control valve of the first selector valve, the hydraulic flow of flow control valve and the hydraulic flow of the first selector valve are matched, so that the port for drawdown pressure of oil hydraulic motor remains in default scope.
Further, pressure control mechanism comprises the second oil hydraulic pump and the pressure controlled valve that is connected to flow control valve, and controller comprises according to the step of the aperture of the hydraulic flow pilot pressure control mechanism adjust flux control valve of the first selector valve: control the second oil hydraulic pump to flow control valve output hydraulic pressure oil; Controller exports the hydraulic fluid pressure of the control end of flow control valve to according to the hydraulic flow adjusting pressure controlled valve of the first selector valve, with the aperture of adjust flux control valve.
Further, elevator decline control system also comprises the braking system of braking this oil hydraulic motor, and this braking system comprises master cylinder, and the step of setting up the port for drawdown pressure of oil hydraulic motor comprises: close master cylinder and flow control valve, make master cylinder brake fluid pressure motor; Control the first oil hydraulic pump to the port for drawdown output hydraulic pressure oil of oil hydraulic motor, make the port for drawdown hydraulic fluid pressure of oil hydraulic motor reach preset pressure; Open master cylinder and flow control valve.
Further, speed regulating method also comprises: controller detects the port for drawdown pressure of oil hydraulic motor, and when decline mouth pressure is between preset pressure and minimum setting value, the aperture of controller adjust flux control valve, makes port for drawdown pressure reach preset pressure; When decline mouth pressure is less than minimum setting value, controller is closed master cylinder, makes master cylinder brake fluid pressure motor.
In accordance with a further aspect of the present invention, provide a kind of crane gear, comprised oil hydraulic motor speed control system, this oil hydraulic motor speed control system is above-mentioned oil hydraulic motor speed control system.
Apply technological scheme of the present invention, oil hydraulic motor speed control system comprises flow control valve and controls the pressure control mechanism of the aperture of this flow control valve, in elevator speed control system working procedure, can be in the situation that setting up hoist motor pressure, by controlling the aperture of flow control valve, regulate the hydraulic pressure oil mass of the first selector valve and the relation between the hydraulic flow of flow control valve, the hydraulic pressure oil mass of the first selector valve and the hydraulic flow of flow control valve are matched, thereby control the pressure of the port for drawdown of motor elevator, there is the phenomenon that pressure is excessive or too small in the port for drawdown that prevents hoist motor, guarantee the Security of elevator speed control system.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of oil hydraulic motor speed control system of the prior art;
Fig. 2 shows the structural representation of oil hydraulic motor speed control system according to an embodiment of the invention;
Fig. 3 shows the controller control principle drawing of oil hydraulic motor speed control system according to an embodiment of the invention; And
Fig. 4 shows the speed governing flow chart of oil hydraulic motor speed control system according to an embodiment of the invention.
Reference character: 10, the first oil hydraulic pump; 20, oil hydraulic motor; 30, the first selector valve; 40, flow control valve; 50, pressure control mechanism; 60, controller; 70, feedback oil circuit; 80, braking system; 51, the second oil hydraulic pump; 52, pressure controlled valve; 81, master cylinder; 82, the second selector valve; 83, accumulator; 84, one-way valve.
Embodiment
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
As shown in Figures 2 and 3, according to embodiments of the invention, oil hydraulic motor speed control system comprises the first oil hydraulic pump 10, oil hydraulic motor 20, the first selector valve 30, flow control valve 40, pressure control mechanism 50 and controller 60.Oil hydraulic motor 20 comprises rising mouth A and the port for drawdown B that rises or decline for controlling weight.The first selector valve 30 is connected between oil hydraulic motor 20 and the first oil hydraulic pump 10, the filler opening of the first selector valve 30 is connected to the output terminal of the first oil hydraulic pump 10, the first actuator port of the first selector valve 30 is connected to the port for drawdown B of oil hydraulic motor 20, and the second actuator port of the first selector valve 30 is connected to the rising mouth A of oil hydraulic motor 20.Flow control valve 40 is connected on second actuator port and the hydraulic pipe line between rising mouthful A of the first selector valve 30, controls the hydraulic flow at mouthful A place of rising.Pressure control mechanism 50 is connected to the control end of flow control valve 40, controls the aperture of flow control valve 40.Controller 60 is for obtaining the hydraulic flow of the first selector valve 30, and according to the aperture of these hydraulic flow pilot pressure control mechanism 50 adjust flux control valves 40.
Preferably, in the present embodiment, the first oil hydraulic pump 10 is load-reacting pump, and oil hydraulic motor speed control system also comprises feedback oil circuit 70, and feedback oil circuit 70 feeds back to the larger hydraulic oil of pressure in the rising mouth A of oil hydraulic motor 20 and port for drawdown B the feedback end of load-reacting pump.Delivery outlet at load-reacting pump is connected with overflow relief valve, at the port for drawdown B of oil hydraulic motor 20, is connected with port for drawdown B relief valve, thereby makes whole oil hydraulic motor speed control system have safer usability.Feedback oil circuit 70 comprises shuttle valve, first of shuttle valve compares the first actuator port that mouth is selectively connected to the first selector valve 30, second of shuttle valve compares the second actuator port that mouth is selectively connected to the first selector valve 30, and the delivery outlet of shuttle valve is connected to the feedback end of load-reacting pump.In the process of oil hydraulic motor speed control system work, the rising mouth A of feedback oil circuit 70 comparison liquid pressure motors 20 and the hydraulic fluid pressure of port for drawdown B, then the larger hydraulic oil of pressure is fed back to load-reacting pump, load-reacting pump is adjusted output hydraulic pressure oil pressure according to the pressure of feedback, makes the rising mouth A of oil hydraulic motor 20 or the hydraulic fluid pressure of port for drawdown B reach job requirement.
Preferably, the first selector valve 30 is proportional multi-way valve, in the present embodiment, the first selector valve 30 is three seven logical electromagnetic proportional valves, these three seven logical electromagnetic proportional valves comprise a filler opening, two return openings and four actuator ports, the first actuator port and the second actuator port are communicated with the port for drawdown B of oil hydraulic motor 20 and mouthful A that rises respectively, the 3rd actuator port compares mouth with first of shuttle valve and is communicated with, the 4th actuator port compares mouth with second of shuttle valve and is communicated with, two filler openings are connected to 10, two return openings of the first oil hydraulic pump and are connected to fuel tank.
When three seven logical electromagnetic proportional valves are positioned at left station, filler opening is communicated with the second actuator port, the first actuator port is communicated with return opening, the 4th actuator port is communicated with the second actuator port, the 3rd actuator port cuts out, flow control valve 40 is opened under the effect of hydraulic oil, hydraulic oil enters the rising mouth A of oil hydraulic motor 20 through the second actuator port, and through the first actuator port and return opening, flow back to fuel tank from the port for drawdown B of oil hydraulic motor 20, now weight is in normal ascent stage, the hydraulic fluid pressure that enters the rising mouth A of oil hydraulic motor 20 is fed back to the feedback end of load-reacting pump by feedback oil circuit 70, load-reacting pump feeds back to according to this delivery pressure of adjusting hydraulic oil, make the hydraulic fluid pressure of the rising mouth A of oil hydraulic motor 20 reach requirement.
When three seven logical electromagnetic proportional valves are positioned at right working position, filler opening is communicated with the first actuator port, the second actuator port is communicated with return opening, the 3rd actuator port and the first actuator port are communicated with, the 4th actuator port cuts out, now hydraulic oil enters the port for drawdown B of oil hydraulic motor 20 through the first actuator port from filler opening, and then rising mouth A, the second actuator port and the return opening through oil hydraulic motor 20 flows back to fuel tank.Now weight is in the decline stage, the hydraulic fluid pressure that enters the port for drawdown B of oil hydraulic motor 20 is fed back to the feedback end of load-reacting pump by feedback oil circuit 70, load-reacting pump feeds back to according to this delivery pressure of adjusting hydraulic oil, makes the hydraulic fluid pressure of the port for drawdown B of oil hydraulic motor 20 reach requirement.The be stressed control of control mechanism 50 of the aperture of flow control valve 40, pressure control mechanism 50 is adjusted the aperture size of flow control valve 40 according to the hydraulic fluid pressure of the port for drawdown B of oil hydraulic motor 20, thereby regulate the hydraulic flow through flow control valve 40, reach the object of the hydraulic fluid pressure of the port for drawdown B that controls oil hydraulic motor 20.Because pressure control mechanism 50 is adjusted the hydraulic flow of flow control valve 40 all the time according to the hydraulic fluid pressure of the port for drawdown B of the oil hydraulic motor 20 measuring, therefore can make the hydraulic fluid pressure of port for drawdown B of oil hydraulic motor 20 in a dynamic balance state, can effectively prevent the phenomenons such as the excessive or too small caused shake of the hydraulic fluid pressure of port for drawdown B of oil hydraulic motor 20, effectively improve the Safety performance of oil hydraulic motor speed control system.
Preferably, pressure control mechanism 50 comprises on the second oil hydraulic pump 51, the second oil hydraulic pumps 51 of the control end that is connected to flow control valve 40 and the hydraulic pipe line between flow control valve 40 and is provided with pressure controlled valve 52.In order to prevent that hydraulic fluid pressure exceeds safety pressure in pressure control mechanism 50 working procedure, pressure control mechanism 50 also comprises a relief valve that is connected to the outlet end of the second oil hydraulic pump 51.In the present embodiment, this flow control valve 40 is leading type equilibrium valve, comprise equilibrium valve and for controlling the electric proportional pressure control valve of equilibrium valve aperture, the electric proportional pressure control valve here plays the effect of pressure controlled valve 52, and electric proportional control valve can more accurately control the aperture of equilibrium valve, can make pressure control mechanism 50 pass through more accurately the hydraulic flow of equilibrium valve.
Oil hydraulic motor speed control system also comprises the braking system 80 of brake fluid pressure motor 20, braking system 80 comprises master cylinder 81, master cylinder 81 is connected to the second oil hydraulic pump 51, on hydraulic pipe line between master cylinder 81 and the second oil hydraulic pump 51, be provided with the second selector valve 82, this second selector valve 82 is two-bit triplet selector valve, master cylinder can be communicated with or be connected directly to oil sump tank with the second oil hydraulic pump 51 by this two-bit triplet selector valve, thereby realize braking or release two states.This braking system 80 also can be connected to an independently hydraulic oil supply source.The first oil hydraulic pump 10 and second oil hydraulic pump 51 of the present embodiment are connected in series by a running shaft, are jointly connected to drive motor, realize a motor and drive two oil hydraulic pumps to rotate, and therefore can save space, reduce costs.
Preferably, the one-way valve 84 that is provided with accumulator 83 and prevents hydraulic oil reverse flow to the second oil hydraulic pump 51 in accumulator 83 on the hydraulic pipe line between the second selector valve 82 and the second oil hydraulic pump 51.The second oil hydraulic pump, when to master cylinder 81 conveying liquid force feed, also, simultaneously to the interior conveying liquid force feed of accumulator 83, is accumulated in accumulator 83 hydraulic fluid pressure.When one-way valve 84 can prevent the hydraulic oil release pressure in accumulator 83, hydraulic oil reverse flow to the second oil hydraulic pump 51, makes accumulator to master cylinder 81, to discharge hydraulic energy fast, and assurance master cylinder can be removed the braking to oil hydraulic motor 20 fast.
Oil hydraulic motor speed control system also comprises pressure detection mechanism, and pressure detection mechanism detects the pressure of the port for drawdown B of oil hydraulic motor 20, and controller 60 is locked or unlocking hydraulic pressure motor 20 according to the pressure control master cylinder 81 of the port for drawdown B of oil hydraulic motor 20.When the port for drawdown B of the oil hydraulic motor 20 detecting pressure meets weight decline requirement, in the time of can guaranteeing that weight steadily declines safely, controller 60 is just controlled the brakings that master cylinder 81 is removed oil hydraulic motor 20, makes oil hydraulic motor 20 can drive weight to decline.When the port for drawdown B of the oil hydraulic motor 20 detecting pressure is less than minimum pressure that weight declines safely and requires, controller 60 is just controlled 81 pairs of oil hydraulic motors 20 of master cylinder and is braked, and prevents that weight from dragging oil hydraulic motor 20 and rotating and cause security incident.
According to a further aspect in the invention, provide a kind of speed regulating method of oil hydraulic motor speed control system, this speed regulating method comprises: the port for drawdown B pressure of setting up oil hydraulic motor 20; By controller 60, obtain the hydraulic flow of the first selector valve 30; Controller 60 is according to the aperture of the hydraulic flow pilot pressure control mechanism 50 adjust flux control valves 40 of the first selector valve 30, the hydraulic flow of flow control valve 40 and the hydraulic flow of the first selector valve 30 are matched, the port for drawdown B pressure of oil hydraulic motor 20 is remained in default scope.
Controller 60 comprises according to the step of the aperture of the hydraulic flow pilot pressure control mechanism 50 adjust flux control valves 40 of the first selector valve 30: control the second oil hydraulic pump 51 to flow control valve 40 output hydraulic pressure oil; Controller 60 exports the hydraulic fluid pressure of the control end of flow control valve 40 to according to the hydraulic flow adjusting pressure controlled valve 52 of the first selector valve 30, with the aperture of adjust flux control valve 40.
In this step, controller 60 sends control command and controls the electric current that flows to three seven logical electromagnetic proportional valves, makes the spool of three seven logical electromagnetic proportional valves, under the effect of electromagnetic force, displacement x occur 1, main valve flow Q now 1by formula 1, calculate:
Q 1 = C Q · A 1 · 2 ρ · Δp - - - ( 1 )
C herein qfor the flow coefficient of hydraulic oil, the density that ρ is hydraulic oil, △ p is the setting pressure reduction of load-reacting pump, A 1it is the valve port area of passage of three seven logical electromagnetic proportional valves.
A 1can calculate and obtain by formula 2:
A 1 = W · x 1 2 + Δ 1 2 - - - ( 2 )
Wherein, W is the area of passage gradient of three seven logical electromagnetic proportional valves, △ 1for the radial clearance between valve body and spool.
Above-mentioned C q, ρ, △ 1, W is definite value.
As definite spool travel x 1time main valve (three seven logical electromagnetic proportional valve) flow Q 1afterwards, just can calculate according to formula 3 and 4 the area of passage A of equilibrium valve valve port 2thereby, realize the hydraulic flow of three seven logical electromagnetic proportional valves and the object that balance valve flow matches, concrete formula is as follows:
Q 2=Q 1-Q υ-Q d??(3)
A 2 = Q 2 C Q · 2 ρ · ( p C - p A ) - - - ( 4 )
Wherein, Q 2for the required flow of equilibrium valve, P cfor equilibrium valve C mouth pressure, P afor the pressure at hoist motor rising mouthful A place, Q vfor leakage flow, Q drelief valve flooded traffic for the port for drawdown B place of hoist motor.
From formula 3, if ignore leakage flow Q v, and the hydraulic fluid pressure at the port for drawdown B place of hoist motor can't help the relief valve that is connected with port for drawdown B and sets up, and do not have flooded traffic Q d, now, main valve flow Q 1with balance valve flow Q 2equate.Increase by parameter Q herein more d, be mainly based on security consideration, this partial discharge overflows by the relief valve at the port for drawdown B place of oil hydraulic motor 20, and this moment, the falling pressure of oil hydraulic motor 20 is set up by the relief valve at port for drawdown B place.
Area of passage A due to equilibrium valve 2and becoming corresponding relation between the displacement of balance valve core, equilibrium valve spool travel is in proportion with equilibrium valve guide proportion electromagnet current value again, therefore by above method, just can obtain guide's size of current of equilibrium valve.By calculated equilibrium valve guide proportion electromagnet current size, mate rolling control valve flow, make rolling control valve flow and equilibrium valve flow matches, in the time of just can avoiding flow not mate, the excessive or too small phenomenon of port for drawdown B pressure of oil hydraulic motor 20.
Above-mentioned speed regulating method is independent of motor decline chamber oil circuit by guide's oil circuit of equilibrium valve, equilibrium valve pilot pressure adopts the mode of external control to carry out speed governing to elevator decline loop, on this basis, proposed to control by the mode of calculated flow rate the pilot pressure of equilibrium valve, realize the coupling of main valve flow and balance valve flow, adopt certain algorithm and time-oriented sequential control simultaneously, guarantee that motor decline cavity pressure remains on the scope of permission, thereby can effectively solve the shake of elevator decline low-speed heave-load, guarantee the trouble free service of speed control system.
Preferably, the step of the port for drawdown B pressure of setting oil hydraulic motor 20 comprises: close master cylinder 81 and flow control valve 40, make master cylinder 81 brake fluid pressure motors 20; Control the first oil hydraulic pump 10 to the port for drawdown B output hydraulic pressure oil of oil hydraulic motor 20, make the port for drawdown B hydraulic fluid pressure of oil hydraulic motor 20 reach preset pressure; Open master cylinder 81 and flow control valve 40.
Preferably, speed regulating method also comprises: controller 60 detects the port for drawdown B pressure of oil hydraulic motor 20, and when port for drawdown B pressure is between preset pressure and minimum setting value, the aperture of controller 60 adjust flux control valves 40, makes port for drawdown B pressure reach preset pressure; When port for drawdown B pressure is less than minimum setting value, controller 60 is closed master cylinder 81, makes master cylinder 81 brake fluid pressure motors 20.
Fig. 3 is controller control block diagram, and Fig. 4 is the speed governing flow chart of oil hydraulic motor speed control system.Below in conjunction with Fig. 3 and Fig. 4, introduce the working procedure of oil hydraulic motor speed control system of the present invention:
Operator sends elevator decline instruction by operating grip, and controller 60 sends and controls current value to main valve (three seven logical electromagnetic proportional valves) according to instruction, and valve core of main valve is moved.When elevator main valve right-hand member proportion electro-magnet obtains when electric, spool right position work, load-reacting pump discharge pressure oil enters the port for drawdown B of oil hydraulic motor 20, and the rising mouth A fluid of oil hydraulic motor 20 flows back to fuel tank after equilibrium valve, main valve.Shuttle valve is by the port for drawdown B pressure acquisition of oil hydraulic motor 20 and feed back to load-reacting pump, makes the load-reacting pump port for drawdown B pressure of regulator solution pressure motor 20 accordingly.As can be seen from Figure 3, controller acquisition operations person's handle input instruction, rising mouth A pressure, the port for drawdown B pressure of oil hydraulic motor 20 and the C mouth pressure of equilibrium valve of oil hydraulic motor 20, through algorithm and the sequential logic judgement of predetermining, by controlling unlatching, the adjusting proportion electro-magnet input current value of main valve and the mode of equilibrium valve guide proportion electromagnet input current value of master cylinder 81, realize the flow matches of elevator main valve and equilibrium valve, and reach safety control strategy.
In elevator decline process, the port for drawdown B of the high pressure oil connecting fluid pressure motor 20 of load-reacting pump, when the incipient stage, master cylinder 81 and equilibrium valve are not opened, system pressure increases rapidly, and the port for drawdown B pressure of oil hydraulic motor 20 increases thereupon, when pressure reaches preset value, the master cylinder 81 of oil hydraulic motor 20 is opened, otherwise oil hydraulic motor 20 continues to do pressurising to be processed, until the port for drawdown B pressure of oil hydraulic motor 20 reaches predetermined set value.After master cylinder 81 is opened, controller 60 is according to the open condition of elevator main valve, the guide proportion electromagnet that mode by above-mentioned calculated flow rate balances valve sends certain electric current, now because equilibrium valve spool travel size is to come by the flow rate calculation of elevator main valve, so the pressure of the port for drawdown B of oil hydraulic motor 20 is set by the relief valve being connected with port for drawdown B.
Controller 60 detects the port for drawdown B pressure of oil hydraulic motor 20 all the time by pressure detection mechanism, while declining if the port for drawdown B pressure of oil hydraulic motor 20 is subject to ectocine, according to the variation of the port for drawdown B pressure of oil hydraulic motor 20, control as follows: when port for drawdown B pressure drop is to preset value, but while being greater than the minimum setting value of speed control system, controller 60 can be by predetermining rule, reduce the proportion electro-magnet current value of equilibrium valve, equilibrium valve opening will reduce, due to now not change of main valve aperture, therefore main valve flow does not reduce yet, the port for drawdown B pressure of oil hydraulic motor 20 will increase very soon, reach the pressure of the relief valve setting at port for drawdown B place, make the pressure of port for drawdown B reach setting.When the port for drawdown B of oil hydraulic motor 20 pressure is less than the minimum setting value of speed control system, controller 60 is controlled 81 pairs of oil hydraulic motors 20 of master cylinder and is braked, and prevents contingent elevator " slip hook ", thus the security incident of avoiding.
According to embodiments of the invention, crane gear comprises oil hydraulic motor speed control system, and this oil hydraulic motor speed control system is above-mentioned oil hydraulic motor speed control system.
As can be seen from the above description, the above embodiments of the present invention have realized following technique effect:
1, the present invention is independent of motor decline chamber oil circuit by guide's oil circuit of equilibrium valve, equilibrium valve pilot pressure adopts the mode of external control to carry out speed governing to elevator decline loop, by the method for calculated flow rate, determine equilibrium valve guide proportion electromagnet current, the flow of coupling rolling control valve, to realize the object of controlling motor port for drawdown pressure, make it be unlikely to excessive or too small, thereby prevent from, in oil hydraulic motor working procedure, jitter phenomenon occurs, improve oil hydraulic motor and hang the Security of carrying.
2, in the whole working procedure of elevator speed control system, controller all detects hoist motor port for drawdown pressure, and makes corresponding safety control strategy, effectively avoids 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 a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. an oil hydraulic motor speed control system, is characterized in that, comprising:
The first oil hydraulic pump (10);
Oil hydraulic motor (20), comprises port for drawdown and the mouth that rises;
The first selector valve (30), described the first selector valve (30) is connected between described oil hydraulic motor (20) and described the first oil hydraulic pump (10), the filler opening of described the first selector valve (30) is connected to the output terminal of described the first oil hydraulic pump (10), the first actuator port of described the first selector valve (30) is connected to the port for drawdown of described oil hydraulic motor (20), and the second actuator port of described the first selector valve (30) is connected to the rising mouth of described oil hydraulic motor (20);
Flow control valve (40), is connected on the hydraulic pipe line between the second actuator port of described the first selector valve (30) and the rising mouth of described oil hydraulic motor (20), controls the described mouthful hydraulic flow at place that rises;
Pressure control mechanism (50), is connected to the control end of described flow control valve (40), controls the aperture of described flow control valve (40); And
Controller (60), obtains the hydraulic flow of described the first selector valve (30), and controls according to this hydraulic flow the aperture that described pressure control mechanism (50) regulates described flow control valve (40).
2. oil hydraulic motor speed control system according to claim 1, it is characterized in that, described pressure control mechanism (50) comprises second oil hydraulic pump (51) of the control end that is connected to described flow control valve (40), on the hydraulic pipe line between described the second oil hydraulic pump (51) and described flow control valve (40), is provided with pressure controlled valve (52).
3. oil hydraulic motor speed control system according to claim 2, it is characterized in that, described oil hydraulic motor speed control system also comprises the braking system (80) of the described oil hydraulic motor of braking (20), described braking system (80) comprises master cylinder (81), described master cylinder (81) is connected to described the second oil hydraulic pump (51), on the hydraulic pipe line between described master cylinder (81) and described the second oil hydraulic pump (51), is provided with the second selector valve (82).
4. oil hydraulic motor speed control system according to claim 3, it is characterized in that, on the hydraulic pipe line between described the second selector valve (82) and described the second oil hydraulic pump (51), be provided with accumulator (83) and prevent that the interior hydraulic oil reverse flow of described accumulator (83) is to the one-way valve (84) of described the second oil hydraulic pump (51).
5. oil hydraulic motor speed control system according to claim 3, it is characterized in that, described oil hydraulic motor speed control system also comprises pressure detection mechanism, described pressure detection mechanism detects the pressure of the port for drawdown of described oil hydraulic motor (20), and described controller (60) is controlled oil hydraulic motor (20) described in the locked or release of described master cylinder (81) according to the pressure of the port for drawdown of described oil hydraulic motor (20).
6. a speed regulating method for oil hydraulic motor, is characterized in that, comprising:
Set up the port for drawdown pressure of oil hydraulic motor (20);
By controller (60), obtain the hydraulic flow of the first selector valve (30);
Controller (60) is according to the aperture of hydraulic flow pilot pressure control mechanism (50) the adjust flux control valve (40) of the first selector valve (30), the hydraulic flow of flow control valve (40) and the hydraulic flow of the first selector valve (30) are matched, so that the port for drawdown pressure of oil hydraulic motor (20) remains in default scope.
7. speed regulating method according to claim 6, it is characterized in that, pressure control mechanism (50) comprises the second oil hydraulic pump (51) and the pressure controlled valve (52) that is connected to described flow control valve (40), and described controller (60) comprising according to the step of the aperture of hydraulic flow pilot pressure control mechanism (50) the adjust flux control valve (40) of the first selector valve (30):
Control the second oil hydraulic pump (51) to flow control valve (40) output hydraulic pressure oil;
Controller (60) exports the hydraulic fluid pressure of the control end of flow control valve (40) to according to the hydraulic flow adjusting pressure controlled valve (52) of the first selector valve (30), with the aperture of adjust flux control valve (40).
8. speed regulating method according to claim 6, it is characterized in that, elevator decline control system also comprises the braking system (80) of this oil hydraulic motor of braking (20), and this braking system (80) comprises master cylinder (81), and the step of the port for drawdown pressure of described setting oil hydraulic motor (20) comprising:
Close master cylinder (81) and flow control valve (40), make master cylinder (81) brake fluid pressure motor (20);
Control the first oil hydraulic pump (10) to the port for drawdown output hydraulic pressure oil of oil hydraulic motor (20), make the port for drawdown hydraulic fluid pressure of oil hydraulic motor (20) reach preset pressure;
Open master cylinder (81) and flow control valve (40).
9. speed regulating method according to claim 8, is characterized in that, described speed regulating method also comprises:
Controller (60) detects the port for drawdown pressure of oil hydraulic motor (20), and when decline mouth pressure is between preset pressure and minimum setting value, the aperture of controller (60) adjust flux control valve (40), makes port for drawdown pressure reach preset pressure;
When decline mouth pressure is less than minimum setting value, controller (60) is closed master cylinder (81), makes master cylinder (81) brake fluid pressure motor (20).
10. a crane gear, comprises oil hydraulic motor speed control system, it is characterized in that, described oil hydraulic motor speed control system is the oil hydraulic motor speed control system described in any one in claim 1 to 5.
CN201310499591.7A 2013-10-22 2013-10-22 Hydraulic motor governing system and speed regulating method, crane gear CN103527536B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104391516A (en) * 2014-10-17 2015-03-04 华中科技大学 Hydraulic-winch-flexible-traction-based velocity control method and system of underwater motion body
CN104627880A (en) * 2014-12-31 2015-05-20 中联重科股份有限公司 Closed-type system, control method, winch system and track vehicle walking system
CN105443475A (en) * 2015-12-30 2016-03-30 中国铁建重工集团有限公司 Load pressure self-adaptive control hydraulic system, control method and pre-grooving machine
CN105927602A (en) * 2016-07-08 2016-09-07 四川宏华石油设备有限公司 Winch control device
CN106185671A (en) * 2016-08-25 2016-12-07 武汉船用机械有限责任公司 Pulling winch hydraulic control system
CN106516986A (en) * 2016-12-14 2017-03-22 中联重科股份有限公司 Crane windlass descending speed hydraulic control equipment, method and system and crane
CN108286538A (en) * 2017-01-10 2018-07-17 斗山英维高株式会社 The hydraulic system of engineering machinery
CN109607400A (en) * 2018-11-16 2019-04-12 中汽商用汽车有限公司(杭州) A kind of dedicated lifting mechanism of energy transmission communication signal

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11278795A (en) * 1998-03-30 1999-10-12 Hitachi Constr Mach Co Ltd Hydraulic winding device and working machine loaded with its hydraulic winding device
CN201358149Y (en) * 2009-01-20 2009-12-09 徐州重型机械有限公司 Crane and automatic lifting control system thereof
CN102815633A (en) * 2012-09-03 2012-12-12 上海中联重科桩工机械有限公司 Control device for hydraulic winch and engineering machine
CN102996559A (en) * 2012-12-28 2013-03-27 徐州重型机械有限公司 Rotation control valve, rotation control system and crane
CN202924661U (en) * 2012-12-03 2013-05-08 中联重科股份有限公司 Hydraulic system of hoisting mechanism and crane
CN103161777A (en) * 2011-12-16 2013-06-19 神钢起重机株式会社 Hydraulic driving apparatus for working machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11278795A (en) * 1998-03-30 1999-10-12 Hitachi Constr Mach Co Ltd Hydraulic winding device and working machine loaded with its hydraulic winding device
CN201358149Y (en) * 2009-01-20 2009-12-09 徐州重型机械有限公司 Crane and automatic lifting control system thereof
CN103161777A (en) * 2011-12-16 2013-06-19 神钢起重机株式会社 Hydraulic driving apparatus for working machine
CN102815633A (en) * 2012-09-03 2012-12-12 上海中联重科桩工机械有限公司 Control device for hydraulic winch and engineering machine
CN202924661U (en) * 2012-12-03 2013-05-08 中联重科股份有限公司 Hydraulic system of hoisting mechanism and crane
CN102996559A (en) * 2012-12-28 2013-03-27 徐州重型机械有限公司 Rotation control valve, rotation control system and crane

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104391516B (en) * 2014-10-17 2017-06-20 华中科技大学 The method for control speed and system of the underwater moving body of hydraulic wireline winch flexible drawing
CN104391516A (en) * 2014-10-17 2015-03-04 华中科技大学 Hydraulic-winch-flexible-traction-based velocity control method and system of underwater motion body
CN104627880A (en) * 2014-12-31 2015-05-20 中联重科股份有限公司 Closed-type system, control method, winch system and track vehicle walking system
CN105443475A (en) * 2015-12-30 2016-03-30 中国铁建重工集团有限公司 Load pressure self-adaptive control hydraulic system, control method and pre-grooving machine
CN105443475B (en) * 2015-12-30 2017-10-27 中国铁建重工集团有限公司 Load pressure Self Adaptive Control hydraulic system, control method and pre-cut scouring machine
CN105927602A (en) * 2016-07-08 2016-09-07 四川宏华石油设备有限公司 Winch control device
CN105927602B (en) * 2016-07-08 2017-12-08 四川宏华石油设备有限公司 A kind of winch control device
CN106185671A (en) * 2016-08-25 2016-12-07 武汉船用机械有限责任公司 Pulling winch hydraulic control system
CN106185671B (en) * 2016-08-25 2018-08-28 武汉船用机械有限责任公司 Pulling winch hydraulic control system
CN106516986B (en) * 2016-12-14 2018-05-15 中联重科股份有限公司 Crane hoisting lowering velocity hydraulic-pressure control apparatus, method, system and crane
CN106516986A (en) * 2016-12-14 2017-03-22 中联重科股份有限公司 Crane windlass descending speed hydraulic control equipment, method and system and crane
CN108286538A (en) * 2017-01-10 2018-07-17 斗山英维高株式会社 The hydraulic system of engineering machinery
CN109607400A (en) * 2018-11-16 2019-04-12 中汽商用汽车有限公司(杭州) A kind of dedicated lifting mechanism of energy transmission communication signal

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