CN109681481A - Oil supply system, hydraulic control system and engineering machinery - Google Patents
Oil supply system, hydraulic control system and engineering machinery Download PDFInfo
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- CN109681481A CN109681481A CN201910101554.3A CN201910101554A CN109681481A CN 109681481 A CN109681481 A CN 109681481A CN 201910101554 A CN201910101554 A CN 201910101554A CN 109681481 A CN109681481 A CN 109681481A
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- China
- Prior art keywords
- oil
- valve
- supply system
- pump
- pressure
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Classifications
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- 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
-
- 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
- F15B2211/205—Systems with pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a kind of oil supply system, hydraulic control system and engineering machinery, and wherein oil supply system includes: oil feed pump (6)；Slippage pump (7)；With repairing control system, it is arranged between the oil outlet of the slippage pump (7) and the regulating valve for adjusting oil feed pump (6) discharge capacity, for adjusting the openings of sizes of the regulating valve by the output pressure of the slippage pump (7), and then adjust the discharge capacity of the oil feed pump (6).Hydraulic control system includes oil supply system.Engineering machinery includes hydraulic control system.The present invention is when the output pressure of slippage pump is smaller; the openings of sizes of regulating valve is restricted, therefore the discharge capacity of oil feed pump is not too large, and the discharge capacity of the oil feed pump when the output pressure of slippage pump is smaller can be prevented still very big and cause emptying phenomenon; effective protection oil feed pump is not damaged, save the cost.
Description
Technical field
The present invention relates to technical field of engineering machinery more particularly to a kind of oil supply systems, hydraulic control system and engineering machine
Tool.
Background technique
Crane hydraulic system has the characteristics that high-energy density and control are flexible, and hydraulic pump is in hydraulic system can not
Or scarce element, it provides the kinetic energy of execution movement for system.Hydraulic pump includes open type pump and enclosed pump, and enclosed pumps self-priming itself
Ability is poor, cannot be directly used to open system, and when for the hydraulic systems such as elevator, luffing, flexible, needs to pump to enclosed
Carry out repairing.
Currently, being typically provided with oil-supplementing system in hydraulic system to prevent enclosed pump from emptying phenomenon occur.It is hydraulic in crane
In system, although existing oil-supplementing system can be operated normally when elevator and revolution etc. are to the lesser operating condition of topping up of oil demand,
But luffing and it is flexible equal to topping up of oil demand biggish operating condition when, existing oil-supplementing system is easy to occur emptying phenomenon.Enclosed
When pump is emptied, will lead to luffing, telescopic system can not be acted, and larger inconvenience can be brought to user；But also it may
Enclosed pump is caused sharply to damage, the price of enclosed pump is higher, thus will increase more cost of serving and customer using cost.
Summary of the invention
The purpose of the present invention is to propose to a kind of oil supply system, hydraulic control system and engineering machinery, to be reduced as far as
The problem of enclosed pump is emptied.
To achieve the above object, the present invention provides a kind of oil supply systems, comprising:
Oil feed pump；
Slippage pump；With
Repairing control system is arranged between the oil outlet of slippage pump and the regulating valve for adjusting fuel feeding pumpage, uses
The openings of sizes of regulating valve is adjusted in the output pressure by slippage pump, and then adjusts the discharge capacity of oil feed pump.
Optionally, repairing control system includes pilot control system, and pilot control system is used for the output by slippage pump
Pressure controls the size of the pilot pressure of its be applied to regulating valve, and then adjusts the openings of sizes of regulating valve.
Optionally, pilot control system includes:
Pilot oil source；With
Proportional pressure-reducing valve, oil inlet are connected to pilot oil source, the control terminal connection of oil outlet and regulating valve, control
End is connected to the oil outlet of slippage pump, to adjust the openings of sizes of proportional pressure-reducing valve by the output pressure of slippage pump, and then is adjusted
Section pilot oil source is applied to the size of the pilot pressure of regulating valve.
Optionally, oil supply system further includes oil compensation pressure control system, for controlling the output pressure of slippage pump.
Optionally, oil compensation pressure control system includes the first inserted valve, and the oil outlet of slippage pump is arranged in the first inserted valve
Between oil return fuel tank, the spring cavity pressure adjustable of the first inserted valve.
Optionally, the oil inlet of the first inserted valve is connected to the spring cavity of the first inserted valve.
Optionally, the connection oil circuit between the oil inlet of the first inserted valve and the spring cavity of the first inserted valve is equipped with oil strain
Device and/or damping hole.
Optionally, control pressurer system further include:
Switch valve；
First overflow valve；With
Second overflow valve is connected in parallel between the spring cavity of the first inserted valve and oil return fuel tank with the first overflow valve,
Setting pressure is different from the setting pressure of the first overflow valve, and the oil inlet and the second overflow valve of the first overflow valve is arranged in switch valve
Oil inlet between, to pass through the pressure of the spring cavity of the first inserted valve of on-off valve regulation of switch valve.
Optionally, oil supply system further includes Fill valve, and oil feed pump includes the first hydraulic fluid port and the second hydraulic fluid port, and Fill valve setting exists
Between the oil outlet of slippage pump and the first hydraulic fluid port, Fill valve is used to control the repairing between the oil outlet of slippage pump and the first hydraulic fluid port
The on-off of oil circuit.
Optionally, the first hydraulic fluid port is connected to the control valve group for controlling executing agency's movement, Fill valve and the first hydraulic fluid port
Connection oil circuit between control valve group is connected in parallel.
Optionally, oil supply system further includes hydraulic control switching valve, and Fill valve includes the second inserted valve, and the setting of hydraulic control switching valve exists
Between the oil outlet of slippage pump and the spring cavity of the second inserted valve.
Optionally, Fill valve includes the second inserted valve, is set between the oil outlet of slippage pump and the oil inlet of the second inserted valve
There is check valve.
Optionally, repairing oil sources is equipped in oil feed pump, repairing oil sources is used to be oil feed pump repairing.
To achieve the above object, the present invention also provides a kind of hydraulic control systems, including above-mentioned oil supply system.
Optionally, hydraulic control system further includes executing agency and control valve group, control valve group be connected to executing agency and
Between oil supply system, control valve group is used to control the movement of executing agency.
Optionally, hydraulic control system includes two sets of oil supply systems, with benefit when the failure of a set of oil supply system wherein
Fuel feeding is carried out with another set of oil supply system.
To achieve the above object, the present invention also provides a kind of engineering machinery, including above-mentioned hydraulic control system.
Based on the above-mentioned technical proposal, the embodiment of the present invention is in the oil outlet of slippage pump and tune for adjusting fuel feeding pumpage
It is provided with repairing control system between section valve, which can adjust regulating valve by the output pressure of slippage pump
Openings of sizes, in this way when the output pressure of slippage pump is larger, the opening of regulating valve can also be adjusted to maximum, make oil feed pump
Discharge capacity increases；And when the output pressure of slippage pump is smaller, the openings of sizes of regulating valve is restricted, therefore the discharge capacity of oil feed pump
It is not too large, the discharge capacity of the oil feed pump when the output pressure of slippage pump is smaller can be prevented still very big and cause emptying phenomenon,
Effective protection oil feed pump is not damaged, save the cost.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the hydraulic principle of oil supply system one embodiment of the present invention and the hydraulic control system using the oil supply system
Figure.
In figure:
1, motor；2, oil cylinder；3, pressure sensor；4, control valve group；5, spare oil supply system；6, oil feed pump；7, repairing
Pump；8, check valve；9, oil filter；10, the first inserted valve；11, switch valve；12, the first overflow valve；13, the second overflow valve；14,
Proportional pressure-reducing valve；15, hydraulic control switching valve；16, the second inserted valve.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, is clearly and completely retouched to the technical solution in embodiment
It states.Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Bright embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", " transverse direction ", " longitudinal direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
The limitation of the scope of the present invention.
In order to be reduced as far as the problem of oil feed pump is emptied, the present invention provides a kind of improved oil supply systems.
As shown in Figure 1, the oil supply system includes supplying in an illustrative examples of oil supply system provided by the invention
Oil pump 6, slippage pump 7 and repairing control system, repairing set-up of control system is in the oil outlet of slippage pump 7 and for adjusting oil feed pump
Between the regulating valve of 6 discharge capacities, repairing control system is used to adjust the openings of sizes of regulating valve by the output pressure of slippage pump 7,
And then adjust the discharge capacity of oil feed pump 6.
In the above-described embodiments, it is arranged between the oil outlet of slippage pump 7 and regulating valve for adjusting 6 discharge capacity of oil feed pump
There is repairing control system, which can adjust the openings of sizes of regulating valve by the output pressure of slippage pump 7,
In this way when the output pressure of slippage pump 7 is larger, the opening of regulating valve can also be adjusted to maximum, increase the discharge capacity of oil feed pump 6；
And when the output pressure of slippage pump 7 is smaller, the openings of sizes of regulating valve is restricted, therefore the discharge capacity of oil feed pump 6 will not
It is too big, the discharge capacity of the oil feed pump 6 when the output pressure of slippage pump 7 is smaller can be prevented still very big and cause emptying phenomenon, had
Effect protection oil feed pump 6 is not damaged, save the cost.
When crane hydraulic system includes above-mentioned oil supply system, even if to the need of topping up of oil under luffing and the operating conditions such as flexible
It asks larger, can also prevent from being emptied in such a way that repairing control system adjusts the discharge capacity of oil feed pump.
Optionally, repairing control system includes pilot control system, and pilot control system is used for the output by slippage pump 7
Pressure controls the size of the pilot pressure of its be applied to regulating valve, and then adjusts the openings of sizes of regulating valve.It is controlled by guide
The mode of system realizes the adjusting to regulating valve openings of sizes, and adjustment speed is faster, sensitiveer, effectively improve adjusting efficiency.
Further, pilot control system includes pilot oil source and proportional pressure-reducing valve 14, the oil inlet of proportional pressure-reducing valve 14
It is connected to pilot oil source, the oil outlet of proportional pressure-reducing valve 14 and the control terminal of regulating valve connect, the control terminal of proportional pressure-reducing valve 14
It is connected to the oil outlet of slippage pump 7, to adjust the openings of sizes of proportional pressure-reducing valve 14 by the output pressure of slippage pump 7, in turn
Adjust the size that pilot oil source is applied to the pilot pressure of regulating valve.
Oil supply system can also include oil compensation pressure control system, and oil compensation pressure control system is for controlling slippage pump 7
Output pressure.
Optionally, oil compensation pressure control system includes the first inserted valve 10, and going out for slippage pump 7 is arranged in the first inserted valve 10
Between hydraulic fluid port and oil return fuel tank, the spring cavity pressure adjustable of the first inserted valve 10.By the spring cavity for adjusting the first inserted valve 10
Pressure size, can control the size of the output pressure of slippage pump 7.
Further, the oil inlet of the first inserted valve 10 is connected to the spring cavity of the first inserted valve 10.In this way, being inserted first
When filling the oil inlet oil inlet of valve 10, oil liquid can enter the spring cavity of the first inserted valve 10, in the active force of spring and the pressure of oil liquid
Under power collective effect, the first inserted valve 10 is in the state that cannot be opened；And in the oil inlet and spring cavity of the first inserted valve 10
Between connection oil circuit when blocking, when oil liquid pressure is greater than acting force of the spring, the first inserted valve 10 is opened, slippage pump 7
Oil outlet outflow hydraulic oil flow back to fuel tank through the first inserted valve 10.
Optionally, the connection oil circuit between the oil inlet of the first inserted valve 10 and the spring cavity of the first inserted valve 10 is equipped with
The oil inlet of the first inserted valve 10 and the spring cavity of the first inserted valve 10 can be effectively prevented by the way that oil filter is arranged in oil filter
Between connection oil circuit block.
It can also be arranged on connection oil circuit between the oil inlet of first inserted valve 10 and the spring cavity of the first inserted valve 10
Throttling and pressure stabilization function may be implemented in damping hole, the damping hole.By adjusting the size of damping hole, can also realize to slippage pump
The adjusting of 7 output pressure.
In order to realize that the pressure of the spring cavity to the first inserted valve 10 is adjusted, oil compensation pressure control system further includes out
Valve 11, the first overflow valve 12 and the second overflow valve 13 are closed, the second overflow valve 13 and the first overflow valve 12 are connected in first in parallel and insert
Between the spring cavity and oil return fuel tank for filling valve 10, the setting pressure of the setting pressure of the second overflow valve 13 and the first overflow valve 12 is not
Together, switch valve 11 is arranged between the oil inlet of the first overflow valve 12 and the oil inlet of the second overflow valve 13, to pass through switch valve
The pressure of the spring cavity of 11 the first inserted valve of on-off valve regulation 10.
Oil compensation pressure control system is in addition to the above-mentioned knot including switch valve 11, the first overflow valve 12 and the second overflow valve 13
Except structure, there can also be a lot of other selections, such as can be using electric proportional pressure control valve etc., I will not elaborate.
In above-mentioned each embodiment, slippage pump 7 can be using electric ratio slippage pump, can also be using quantitative slippage pump.
In order to realize more accurate supervisory function bit, pressure sensor can be set in the outlet of slippage pump 7, for detecting slippage pump 7
Output pressure, prevent from being emptied.
The hydraulic control system of 1 pair of oil supply system one embodiment of the present invention and application oil supply system with reference to the accompanying drawing
Specific structure and the course of work be illustrated:
As shown in Figure 1, the hydraulic control system includes motor 1, oil cylinder 2, control valve group 4 and two oil supply systems, two
One is to working condition in oil supply system, another is stand-by state.In the hydraulic control system course of work, if in
The oil supply system (including oil feed pump 6, slippage pump 7 and repairing control system) of working condition breaks down, and can use spare confession
Oil system 5 carries out fuel feeding.
It is described in detail below in Fig. 1 in the oil supply system to working condition:
The oil supply system includes oil feed pump 6, slippage pump 7 and repairing control system, and oil feed pump 6 is enclosed pump, repairing control
System includes the first inserted valve 10, switch valve 11, the first overflow valve 12 and the second overflow valve 13.
The oil inlet of first inserted valve 10 is connected to the oil outlet of slippage pump 7, the oil outlet of the first inserted valve 10 and oil return
Fuel tank connection, and the oil inlet of the first inserted valve 10 is connected to the spring cavity of the first inserted valve 10, the oil inlet of the first inserted valve 10
Connection oil circuit between mouth and the spring cavity of the first inserted valve 10 is equipped with oil filter 9 and damping hole.The bullet of first inserted valve 10
Spring chamber is connected to switch valve 11.Switch valve 11 is two-position two-way solenoid valve, and under normality, the right position of switch valve 11 is in working position,
For connected state；When obtaining electric, the left position of switch valve 11 is in working position, is off-state.
First overflow valve 12 and the second overflow valve 13 are connected in parallel, the oil inlet of the first overflow valve 12 and switch valve 11 into
The connection of the spring cavity of hydraulic fluid port and the first inserted valve 10, the oil inlet of the second overflow valve 13 are connected to the oil outlet of switch valve 11.The
The oil outlet of one overflow valve 12 is connected to the oil outlet of the second overflow valve 13, and is connected to simultaneously with oil return fuel tank.First overflow valve
12 setting pressure is greater than the setting pressure of the second overflow valve 13.
Repairing control system includes pilot oil source and proportional pressure-reducing valve 14, the oil inlet and pilot oil source of proportional pressure-reducing valve 14
Connection, the oil outlet of proportional pressure-reducing valve 14 are connected to the control terminal of regulating valve, control terminal and the slippage pump 7 of proportional pressure-reducing valve 14
Oil outlet connection, and the control terminal of proportional pressure-reducing valve 14 is connected to the oil inlet of the first inserted valve 10 and the oil outlet of slippage pump 7
Between connection oil circuit on.
Oil supply system further includes Fill valve, and oil feed pump 6 includes the first hydraulic fluid port B and the second hydraulic fluid port A, and Fill valve is arranged in repairing
Between the oil outlet and the first hydraulic fluid port B of pump 7, Fill valve is used to control the repairing between the oil outlet of slippage pump 7 and the first hydraulic fluid port B
The on-off of oil circuit.
First hydraulic fluid port B is connected to the control valve group 4 for controlling executing agency's movement, Fill valve and the first hydraulic fluid port B and control
Connection oil circuit between valve group 4 processed is connected in parallel.I.e. the first hydraulic fluid port B is directly connected to the B1 of control valve group 4 mouth, in this way from first
The oil liquid that hydraulic fluid port B comes out can be directly entered control valve group 4, without passing through Fill valve and repairing control system, be conducive to
Repairing is also possible to prevent when avoiding the pressure loss, while carrying out repairing by the repairing oil sources inside oil feed pump 6 and flows back to fuel tank, is prevented
Only it is emptied.
Oil supply system further includes hydraulic control switching valve 15, and Fill valve includes the second inserted valve 16, and the setting of hydraulic control switching valve 15 exists
Between the oil outlet of slippage pump 7 and the spring cavity of the second inserted valve 16.Hydraulic control switching valve 15 is two position two-way valve, the first work
Hydraulic fluid port is connected to oil return fuel tank, and the second actuator port is connected to the spring cavity of the second inserted valve 16.A left side for hydraulic control switching valve 15
End control terminal is connected to the oil outlet of slippage pump 7, and the right end control terminal of hydraulic control switching valve 15 is spring terminal, in the defeated of slippage pump 7
When pressure is zero out, the right position of hydraulic control switching valve 15 is in working position, is off-state；Slippage pump 7 output pressure slowly
When increase, the left position of hydraulic control switching valve 15 is in working position, is connected state, the at this time spring cavity of the second inserted valve 16 and oil return
Fuel tank connection.
Damping hole is connected in parallel between the spring cavity of second inserted valve 16 and the oil outlet of the second inserted valve 16.
Check valve 8 is equipped between the oil outlet of slippage pump 7 and the oil inlet of the second inserted valve 16.Second inserted valve 16 into
The oil inlet of hydraulic fluid port, the control terminal of proportional pressure-reducing valve 14 and the first inserted valve 10 is connected to the oil outlet of check valve 8.
Repairing oil sources is equipped in oil feed pump 6, repairing oil sources is used to be 6 repairing of oil feed pump.The topping up of oil of the repairing oil sources compared with
It is small, it is mainly used for preventing oil feed pump 6 from itself leaking.
Hydraulic control system using above-mentioned oil supply system further includes executing agency and control valve group 4, and control valve group 4 connects
It connects between executing agency and oil supply system, control valve group 4 is used to control the movement of executing agency.
Executing agency includes motor 1 and oil cylinder 2, and the both ends hydraulic fluid port of motor 1 connects with the hydraulic fluid port B4 and A4 of control valve group 4 respectively
Logical, the big chamber and small chamber of oil cylinder 2 are connected to the hydraulic fluid port A3 and B3 of control valve group 4 respectively.First hydraulic fluid port A of oil feed pump 6 and control
The hydraulic fluid port A1 of valve group 4 is connected to, and the second hydraulic fluid port B is connected to the hydraulic fluid port B1 of control valve group 4.It is equipped between first hydraulic fluid port A and hydraulic fluid port A1
Pressure sensor 3, for detecting the charge oil pressure of oil feed pump 6.
Hydraulic control system includes two sets of oil supply systems, another set of to utilize when the failure of a set of oil supply system wherein
Oil supply system carries out fuel feeding.Spare oil supply system 5 is connected to the hydraulic fluid port A2 and B2 of control valve group 4.
When oil mass demand is larger, two sets of oil supply systems can also be made to work at the same time, be supplied simultaneously by two sets of oil supply systems
Oil improves system working efficiency to improve fuel delivery.
For hydraulic control system is used for crane, to repairing of the hydraulic control system when carrying out different movements
Journey is illustrated:
1, luffing acts repairing
When luffing rises, the Y1b of the regulating valve of oil feed pump 6 obtains electric, and high pressure oil that oil feed pump 6 exports is by control valve group 4
A1, A3 mouthfuls of big chambers to oil cylinder 2, the small chamber oil liquid of oil cylinder 2 flow back to the B mouths of oil feed pump 6 by B3, B1 mouthfuls.It mends in the process
The work of oil system is as follows: the solenoid valve Y2 for controlling slippage pump 7 obtain it is electric, the oil that slippage pump 7 is got pass through check valve 8, so
Open afterwards the oil liquid that slippage pump 7 is got of hydraulic control switching valve 15 by the second inserted valve 16 enter the B mouth of slippage pump 7 into
Row repairing；The oil liquid that slippage pump 7 is got simultaneously provides pressure to the control terminal of proportional pressure-reducing valve 14, exports proportional pressure-reducing valve 14
Higher pilot pressure provides pressure, when the electric current for being applied to regulating valve Y1 is gradually increased, fuel feeding to the discharge capacity of oil feed pump 6
The discharge capacity of pump 6 is also gradually increased.Solenoid valve Y3 must not be electric during luffing rises, and slippage pump 7 gives fuel feeding with lower pressure output
Pump 6 repairings.
When luffing is fallen, the Y1a of the regulating valve of oil feed pump 6 obtains electric, and the high pressure oil of the big chamber of oil cylinder 2 output passes through control valve group
4 A3, A1 mouth enters A mouth of oil feed pump 6, then by a part of B1, B3 mouth Jing Guo control valve group of the B mouth of oil feed pump 6 into
Enter the small chamber of oil cylinder, another part enters the C mouth of oil-supplementing system.The work of oil-supplementing system is as follows in the process: oil feed pump 6 passes through
After the oil liquid of B mouthfuls of outputs reaches the C mouth of oil-supplementing system, oil return fuel tank is flowed back to by the second inserted valve 16 and the first inserted valve 10；
Oil liquid presses to proportional pressure-reducing valve 14 simultaneously, so that proportional pressure-reducing valve 14 is exported higher pilot pressure, mentions to the variable of oil feed pump 6
For elevated pressures；And it opens the oil liquid that hydraulic control switching valve 15 exports the B mouth of oil feed pump 6 and passes through the second inserted valve 16
Into the first inserted valve 10 then oil return to fuel tank.Y3 must not be electric during being somebody's turn to do, and slippage pump 7 exports oil always with minimum discharge capacity
Liquid.
2, elevator acts repairing
When hoisting crane acts, regulating valve Y1b obtains electric, A1 mouth of the high-voltage oil liquid of oil feed pump 6 Jing Guo control valve group 4, A4 mouthfuls
Into motor 1, the B4 mouth of control valve group 4 is passed through, the B1 mouthfuls of B mouths for flowing back to oil feed pump 6 are formed into a loop.When elevator falls movement, adjust
Section valve Y1a obtain it is electric, B1 mouth of the high-voltage oil liquid of oil feed pump 6 Jing Guo control valve group 4, B4 mouthfuls into motor 1, pass through control valve group
4 A4 mouth, the A1 mouthfuls of A mouths for flowing back to oil feed pump 6 are formed into a loop.
During elevator rises and falls, in order to make up the leakage of system, there is constant repairing oil sources to confession inside oil feed pump 6 always
6 repairing of oil pump.Solenoid valve Y3 obtain it is electric, setting higher first overflow valve 12 of pressure work；The oil liquid of the B mouth of oil feed pump 6 is straight
The B1 mouth for connecing traffic organising valve group 4 without going past the first inserted valve 10, therefore can will reduce the pressure loss；Enclosed slippage pump 7
Discharge capacity is almost nil.Meanwhile hoisting system has pressure Memory control, when being acted using controller record oil feed pump 6 is last
The pressure in exit after judgement reaches the pressure of support load, opens elevator system when elevator acts again by control signal
Dynamic device, then hydraulic motor is acted again, realizes the operation of elevator hoist safety and steady.
3, expanding-contracting action repairing
In telescopic arm action process, the repairing flow of slippage pump 7 is provided according to the large and small chamber demand for exports of telescopic oil cylinder；It mends
The work operating condition of oil pump 7 is similar with luffing movement.
About above-mentioned oil-supplementing system, when the outlet pressure of slippage pump 7 is more than certain value, proportional pressure-reducing valve 14 can be exported
Sufficiently high pressure, while oil feed pump 6 can be made to reach after reaching certain value with the control electric current of closed system solenoid valve Y1
Maximum pump discharge.Moreover, hydraulic control switching valve 15 commutates when the outlet pressure of slippage pump 7 is more than certain value, make the second inserted valve 16
It opens, the B mouth oil liquid of oil liquid and oil feed pump 6 that slippage pump 7 exports could form access.
If the first inserted valve 10 is blocked, the first inserted valve 10 is easy to be opened, the oil that slippage pump 7 exports
Liquid flows back to oil return fuel tank through the first inserted valve 10, therefore slippage pump 7 cannot establish higher pressure；Slippage pump 7 is exportable at this time
Pressure it is lower, then guide oil can only export lower pressure by proportional pressure-reducing valve 14, then be merely able to oil feed pump 6 provide compared with
Small pressure, even if the electric current of solenoid valve Y1 is larger, the discharge capacity of oil feed pump 6 at this time also can be smaller, therefore it is possible to prevente effectively from for
There is emptying phenomenon in oil pump 6.Can use the repairing oil sources inside oil feed pump 6 at this time makes luffing or stretches equal movements progress slowly
Movement since the outlet pressure of slippage pump 7 is lower, cannot make hydraulic control switching valve 15 commutate, then will not make repairing in such cases
The oil liquid of oil sources output flows back to fuel tank by the second inserted valve 16, further avoids carrying out oil feed pump 6 when luffing or expanding-contracting action
The phenomenon that being emptied.
By the explanation of multiple embodiments to oil supply system of the present invention, hydraulic control system and engineering machinery, can see
Implementing example to oil supply system of the present invention, hydraulic control system and engineering machinery at least has the advantages that one or more of:
1, the control end pressure that the regulating valve for adjusting fuel feeding pumpage is controlled by the output pressure of slippage pump is big
It is small, so that the discharge capacity of oil feed pump is also restrained when repairing pump output pressure is smaller, avoid smaller in repairing pump output pressure
When since the discharge capacity of oil feed pump is larger cause the phenomenon that being emptied, effective protection oil feed pump reduces cost；
2, it is equipped with oil compensation pressure control system, can be selected using different pressure for elevator, luffing and expanding-contracting action,
It can satisfy according to the accurate repairing of oil feed pump flow demand amount；
3, it is equipped with hydraulic control switching valve, repairing is controlled by the output pressure of slippage pump；
4, it is equipped with oil filter in the first inserted valve, prevents the first inserted valve from blocking, and even if the first inserted valve is sent out
Raw blocking, can also make system carry out low speed movement, without there is emptying phenomenon；
5, the hydraulic fluid port of oil feed pump and control valve group are directly connected to, and need not move through oil-supplementing system, can reduce the pressure loss,
It prevents repairing from flowing back to fuel tank simultaneously, effectively prevent being emptied.
Based on above-mentioned hydraulic control system, the present invention also proposes a kind of engineering machinery, which includes above-mentioned
Hydraulic control system.
Actively technical effect is equally applicable to possessed by oil supply system and hydraulic control system in above-mentioned each embodiment
Engineering machinery, which is not described herein again.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (17)
1. a kind of oil supply system characterized by comprising
Oil feed pump (6)；
Slippage pump (7)；With
Repairing control system, be arranged the slippage pump (7) oil outlet with for adjust oil feed pump (6) discharge capacity regulating valve it
Between, for adjusting the openings of sizes of the regulating valve by the output pressure of the slippage pump (7), and then adjust the oil feed pump
(6) discharge capacity.
2. oil supply system according to claim 1, which is characterized in that the repairing control system includes pilot control system
System, the pilot control system, which is used to control it by the output pressure of the slippage pump (7), is applied to the regulating valve
The size of pilot pressure, and then adjust the openings of sizes of the regulating valve.
3. oil supply system according to claim 2, which is characterized in that the pilot control system includes:
Pilot oil source；With
Proportional pressure-reducing valve (14), oil inlet are connected to the pilot oil source, and the control terminal of oil outlet and the regulating valve connects
It connects, control terminal is connected to the oil outlet of the slippage pump (7), described in being adjusted by the output pressure of the slippage pump (7)
The openings of sizes of proportional pressure-reducing valve (14), and then the adjusting pilot oil source is applied to the big of the pilot pressure of the regulating valve
It is small.
4. oil supply system according to claim 1, which is characterized in that further include oil compensation pressure control system, for controlling
The output pressure of the slippage pump (7).
5. oil supply system according to claim 4, which is characterized in that the oil compensation pressure control system includes the first inserting
Valve (10), first inserted valve (10) are arranged between the oil outlet and oil return fuel tank of the slippage pump (7), and described first inserts
Fill the spring cavity pressure adjustable of valve (10).
6. oil supply system according to claim 5, which is characterized in that the oil inlet of first inserted valve (10) with it is described
The spring cavity of first inserted valve (10) is connected to.
7. oil supply system according to claim 5, which is characterized in that the oil inlet of first inserted valve (10) with it is described
Connection oil circuit between the spring cavity of first inserted valve (10) is equipped with oil filter and/or damping hole.
8. oil supply system according to claim 5, which is characterized in that the control pressurer system further include:
Switch valve (11)；
First overflow valve (12)；With
Second overflow valve (13), with first overflow valve (12) be connected in parallel the spring cavity of first inserted valve (10) with
Between oil return fuel tank, setting pressure is different from the setting pressure of first overflow valve (12), switch valve (11) setting
Between the oil inlet of first overflow valve (12) and the oil inlet of second overflow valve (13), to pass through the switch valve
(11) pressure of the spring cavity of the first inserted valve (10) described in on-off valve regulation.
9. oil supply system according to claim 1, which is characterized in that further include Fill valve, the oil feed pump (6) includes the
One hydraulic fluid port and the second hydraulic fluid port, the Fill valve is arranged between the oil outlet and first hydraulic fluid port of the slippage pump (7), described
Fill valve is used to control the on-off of the repairing oil circuit between the oil outlet of the slippage pump (7) and first hydraulic fluid port.
10. oil supply system according to claim 9, which is characterized in that first hydraulic fluid port with for controlling executing agency
The control valve group (4) of movement is connected to, the connection oil circuit between the Fill valve and first hydraulic fluid port and the control valve group (4)
It is connected in parallel.
11. oil supply system according to claim 9, which is characterized in that further include hydraulic control switching valve (15), the Fill valve
Including the second inserted valve (16), hydraulic control switching valve (15) setting is inserted in the oil outlet of the slippage pump (7) with described second
Between the spring cavity for filling valve (16).
12. oil supply system according to claim 9, which is characterized in that the Fill valve includes the second inserted valve (16), institute
It states and is equipped with check valve (8) between the oil outlet of slippage pump (7) and the oil inlet of second inserted valve (16).
13. oil supply system according to claim 1, which is characterized in that be equipped with repairing oil sources, institute in the oil feed pump (6)
Repairing oil sources is stated for for the oil feed pump (6) repairing.
14. a kind of hydraulic control system, which is characterized in that including the described in any item oil supply systems of such as claim 1~13.
15. hydraulic control system according to claim 14, which is characterized in that further include executing agency and control valve group
(4), the control valve group (4) is connected between the executing agency and the oil supply system, and the control valve group (4) is for controlling
Make the movement of the executing agency.
16. hydraulic control system according to claim 14, which is characterized in that the hydraulic control system includes two sets of institutes
Oil supply system is stated, to carry out fuel feeding using the another set of oil supply system when failure of a set of oil supply system wherein.
17. a kind of engineering machinery, which is characterized in that including the described in any item hydraulic control systems of such as claim 14~16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910101554.3A CN109681481B (en) | 2019-02-01 | 2019-02-01 | Oil supply system, hydraulic control system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910101554.3A CN109681481B (en) | 2019-02-01 | 2019-02-01 | Oil supply system, hydraulic control system and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109681481A true CN109681481A (en) | 2019-04-26 |
| CN109681481B CN109681481B (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910101554.3A Active CN109681481B (en) | 2019-02-01 | 2019-02-01 | Oil supply system, hydraulic control system and engineering machinery |
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| Country | Link |
|---|---|
| CN (1) | CN109681481B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397638A (en) * | 2019-08-15 | 2019-11-01 | 中国船舶重工集团公司第七0四研究所 | Integrated hydraulic system valve group |
| CN112408200A (en) * | 2020-10-10 | 2021-02-26 | 武汉船用机械有限责任公司 | Lifting system of crane |
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| CN103836015A (en) * | 2014-03-26 | 2014-06-04 | 徐州重型机械有限公司 | Elevating platform fire truck and control system of landing leg vertical oil cylinder of elevating platform fire truck |
| CN108533556A (en) * | 2018-06-25 | 2018-09-14 | 圣邦集团有限公司 | A kind of repairing switching valve and control system for enclosed and open system switching |
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| CN201972980U (en) * | 2011-01-18 | 2011-09-14 | 湖北神鹰汽车有限责任公司 | Closed type hydraulic system used on cylindrical dumper |
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| CN112408200A (en) * | 2020-10-10 | 2021-02-26 | 武汉船用机械有限责任公司 | Lifting system of crane |
| CN112408200B (en) * | 2020-10-10 | 2022-11-22 | 武汉船用机械有限责任公司 | Lifting system of crane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109681481B (en) | 2021-02-09 |
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