CN108167240B - A kind of hydraulic system of local loading hydraulic press - Google Patents
A kind of hydraulic system of local loading hydraulic press Download PDFInfo
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- CN108167240B CN108167240B CN201711270024.9A CN201711270024A CN108167240B CN 108167240 B CN108167240 B CN 108167240B CN 201711270024 A CN201711270024 A CN 201711270024A CN 108167240 B CN108167240 B CN 108167240B
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- control valve
- solenoid directional
- valve
- directional control
- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
-
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A kind of hydraulic system of local loading hydraulic press, including power output system, the first loading system and the second loading system, the connection of the P of power output system and third solenoid directional control valve mouth, the P mouth connection of the first solenoid directional control valve of the A mouth and the first loading system of third solenoid directional control valve；The P mouth for the second solenoid directional control valve 11 that the B mouth of third solenoid directional control valve is connected with the second loading system connects；The present invention can realize multi-pass, the step forming of more local loadings in a fire heating, the continuous transformation loading zone in forming process, and loading zone main hydraulic system and non-loading zone hydraulic system functional mapping are realized simultaneously, to expand forming capacity of equipment, the forming capacity for being greater than hydraulic system installed power is realized.
Description
Technical field
The invention belongs to hydraulic system of hydraulic machine technical fields, and in particular to a kind of hydraulic pressure system of local loading hydraulic press
System.
Background technique
Local loading and shaping can effectively reduce shaping load, expand component forming size range, improve equipment forming capacity,
It is the effective way of large-scale component Plastic Forming.However regional area applies load, transformation loading zone in forming process, equipment needs
Big shaping load need to be applied to loading zone, and lesser restraint forces are applied to non-loading zone.Double action hydraulic press is general at present
By main and auxiliary two hydraulic systems, the load that auxiliary hydraulic system provides is lower, is only capable of providing restraint forces to non-loading zone, difficult
To meet the shaping load in load deflection area, corresponding shaping load can not be provided after converting loading zone.
When hydraulic tools are there are two the hydraulic press of the above main hydraulic system, each hydraulic system can provide loading zone
Biggish shaping load, but after converting loading zone, non-loading zone hydraulic system still provide loading zone it is an equal amount of at
Shape load, the part beyond restraint forces cause to waste, and equipment forming capacity is suitable with whole loading and shaping, cannot achieve
The superiority of local loading and shaping large-scale component.
Complex large-scale component local loading and shaping is by adjusting mould structure, the corresponding auxiliary device of increase in common liquid at present
It is realized on press, each local loading step requires adjustment more mold exchange, and repeatedly cooling is needed in isothermal or hot forging forming, is added
Heat, forming period length, low efficiency, the more fiery heat effect structure properties of forging.Therefore a time, two local loading steps are mostly used
Forming, significantly limits application of the local loading and shaping in figuration manufacture difficult-to-deformation material complex large-scale component.
Summary of the invention
In order to overcome above-mentioned prior art disadvantage, the purpose of the present invention is to provide a kind of the hydraulic of local loading hydraulic press
System can realize that multi-pass, more local loadings step shape in a fire heating, the continuous transformation loading zone in forming process, and
It realizes loading zone main hydraulic system and non-loading zone hydraulic system functional mapping simultaneously, to expand forming capacity of equipment, realizes
Greater than the forming capacity of hydraulic system installed power.
In order to achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of hydraulic system of local loading hydraulic press, including power output system, the first loading system and the second load
The P mouth of system, power output system and third solenoid directional control valve 9 connects, the A mouth of third solenoid directional control valve 9 and the first load system
The P mouth connection of first solenoid directional control valve 10 of system；The second electricity that the B mouth of third solenoid directional control valve 9 is connected with the second loading system
The P mouth of magnetic reversal valve 11 connects；
The power output system includes high-pressure hydraulic pump 1,1 oil outlet of high-pressure hydraulic pump respectively with inserted valve 2 into
Hydraulic fluid port, pressure control inserted valve 3 oil inlet connection, 2 control chamber of inserted valve connect with 2 oil outlet of inserted valve after with third electromagnetism
The P mouth of reversal valve 9 connects, and pressure controls 3 oil outlet of inserted valve and is connected to fuel tank 24, while connecting with 4 one end of pressure regulator valve, and with the
The T mouth of four solenoid directional control valves 5 connects；Pressure control 3 control chamber of inserted valve is connect with 4 other end of pressure regulator valve, and accesses the 4th electricity
The P mouth of magnetic reversal valve 5, the B mouth of the 4th solenoid directional control valve 5 are connected with the 5th proportional pressure control valve 6；In 4th solenoid directional control valve 5
P mouthfuls of position is connected to T mouthfuls；The T mouth of third solenoid directional control valve 9 is connected with the oil outlet of overflow valve 7, low-pressure hydraulic pump 8；Third electromagnetism
Middle position P mouthfuls of reversal valve 9 are connected to A mouthfuls, B mouthfuls；
First loading system include the first solenoid directional control valve 10, middle position T mouthfuls of the first solenoid directional control valve 10 and A
Mouth, B mouthfuls of connections, the T mouth of the first solenoid directional control valve 10 are connected to fuel tank 24, the A mouth and the first ratio of the first solenoid directional control valve 10
One end connection of overflow valve 12, the first check valve 13, the other end and the first liquid of the first proportional pressure control valve 12, the first check valve 13
The connection of 20 cavity of resorption of cylinder pressure；The B mouth and second one-way valve 14 of first solenoid directional control valve 10, one end of the second proportional pressure control valve 15 connect
Connect, second one-way valve 14, the second proportional pressure control valve 15 the other end connected with 20 epicoele of first hydraulic cylinder, in first hydraulic cylinder 20
Chamber entrance is connected with first pressure sensor 21；
Second loading system include the second solenoid directional control valve 11, middle position T mouthfuls of the second solenoid directional control valve 11 and A
Mouth, B mouthfuls of connections, the T mouth of the second solenoid directional control valve 11 are connected to fuel tank 24, the A mouth and third ratio of the second solenoid directional control valve 11
One end connection of overflow valve 16, third check valve 17, third proportional pressure control valve 16, the other end of third check valve 17 and the second liquid
The connection of 23 cavity of resorption of cylinder pressure, the B mouth and the 4th proportional pressure control valve 19 of the second solenoid directional control valve 11, one end of the 4th check valve 18 connect
Connect, the 4th proportional pressure control valve 19, the 4th check valve 18 the other end connected with 23 epicoele of second hydraulic cylinder, in second hydraulic cylinder 23
Chamber entrance, which goes out, is connected with second pressure sensor 22.
First loading system and the first upper mold 25 are corresponding, and the second loading system and the second upper mold 26 are corresponding, and first
Upper mold 25, the second upper mold 26 form combined type upper mold, and lower die 28 is an entirety.
The invention has the benefit that
The present invention applies load deflection area using multi-pass, the method for more local loadings step forming, continuous transformation loading zone
Add biggish shaping load, and lesser restraint forces are applied to non-loading zone.The hydraulic system can be directly to different hydraulic
The pressure in cylinder different operating stage is regulated and controled, to guarantee pressure needed for different hydraulic cylinders reach different loading zones, and
Hydraulic cylinder keeps the mutation that hydraulic in-cylinder pressure can be prevented when confining pressure, can realize in a fire heating in forming process
Repeatedly transformation local loading region obtains being greater than the forming capacity of whole loading and shaping under identical installed power.
Detailed description of the invention
Fig. 1 is the hydraulic schematic of the embodiment of the present invention.
Fig. 2 is the upper modular constraint gap schematic diagram of the non-loading zone of the embodiment of the present invention.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawing.
Referring to Fig.1, a kind of hydraulic system of local loading hydraulic press, including power output system, the first loading system and
The P mouth of second loading system, power output system and third solenoid directional control valve 9 connects, A mouth of third solenoid directional control valve 9 and the
The P mouth of first solenoid directional control valve 10 of one loading system connects；The B mouth of third solenoid directional control valve 9 is connected with the second loading system
The second solenoid directional control valve 11 P mouth connection；
The power output system includes high-pressure hydraulic pump 1,1 oil outlet of high-pressure hydraulic pump respectively with inserted valve 2 into
The oil inlet connection of hydraulic fluid port, pressure control inserted valve 3, after 2 control chamber of inserted valve is connect with 2 oil outlet of inserted valve, with third electricity
The P mouth of magnetic reversal valve 9 connects, and pressure controls 3 oil outlet of inserted valve and is connected to fuel tank 24, while connecting with 4 one end of pressure regulator valve, and and
The T mouth of 4th solenoid directional control valve 5 connects；Pressure control 3 control chamber of inserted valve is connect with 4 other end of pressure regulator valve, and accesses the 4th
The P mouth of solenoid directional control valve 5, the B mouth of the 4th solenoid directional control valve 5 are connected with the 5th proportional pressure control valve 6；4th solenoid directional control valve 5
Middle position P mouthfuls are connected to T mouthfuls；The T mouth of third solenoid directional control valve 9 is connected with the oil outlet of overflow valve 7, low-pressure hydraulic pump 8；Third electricity
Middle position P mouthfuls of magnetic reversal valve 9 are connected to A mouthfuls, B mouthfuls；
High-pressure hydraulic pump 1 and low-pressure hydraulic pump 8 provide power for system, and intermediate and high pressure hydraulic pumps 1 provide high pressure for workpiece
Deformation load, low-pressure hydraulic pump 8 provides the restraint forces of low pressure for workpiece；Inserted valve 2 prevents hydraulic oil from flowing back to height from system
Hydraulic fluid press pump 1, pressure control inserted valve 3 is combined with pressure regulator valve 4, by setting 4 pressure limit system maximum pressure of pressure regulator valve, pressure
Power control inserted valve 3 is combined with the 4th solenoid directional control valve 5 with the 5th proportional pressure control valve 6, by adjusting the 5th proportional pressure control valve 6 pressure
Power adjusts system working pressure；Third solenoid directional control valve 9 controls the flow direction of 1 hydraulic oil of high-pressure hydraulic pump, third solenoid directional control valve 9
To two hydraulic cylinders while fuel feeding when position in access；Only to 20 fuel feeding of first hydraulic cylinder when accessing left position；Only to the when accessing right position
Two hydraulic cylinders, 23 fuel feeding.
First loading system include the first solenoid directional control valve 10, middle position T mouthfuls of the first solenoid directional control valve 10 and A
Mouth, B mouthfuls of connections, the T mouth of the first solenoid directional control valve 10 are connected to fuel tank 24, the A mouth and the first ratio of the first solenoid directional control valve 10
One end connection of overflow valve 12, the first check valve 13, the other end and the first liquid of the first proportional pressure control valve 12, the first check valve 13
The connection of 20 cavity of resorption of cylinder pressure；The B mouth and second one-way valve 14 of first solenoid directional control valve 10, one end of the second proportional pressure control valve 15 connect
Connect, second one-way valve 14, the second proportional pressure control valve 15 the other end connected with 20 epicoele of first hydraulic cylinder, in first hydraulic cylinder 20
Chamber entrance is connected with first pressure sensor 21；
Pressing component corresponding local loaded area when first hydraulic cylinder 20 works, in hydraulic press work, first is hydraulic
First upper mold 25 needed for installing component shaping on the moved cross beam that cylinder 20 connects, the first solenoid directional control valve 10 control first hydraulic cylinder
20 oil inlet and oil return, 20 upper and lower cavity of first hydraulic cylinder all stops oil inlet when position in access, first hydraulic cylinder 20 when accessing left position
Cavity of resorption oil inlet epicoele oil return, 20 epicoele oil inlet cavity of resorption oil return of first hydraulic cylinder when accessing right position, the first check valve 13 control first
The unidirectional oil inlet of 20 cavity of resorption of hydraulic cylinder, second one-way valve 14 control the unidirectional oil inlet of 20 epicoele of first hydraulic cylinder, and the first ratio is overflow
It flows valve 12 and sets up 20 cavity of resorption return pressure of first hydraulic cylinder, the second proportional pressure control valve 15 sets up 20 epicoele oil return pressure of first hydraulic cylinder
Power, first pressure sensor 21 measure the pressure of 20 epicoele of first hydraulic cylinder.
Second loading system include the second solenoid directional control valve 11, middle position T mouthfuls of the second solenoid directional control valve 11 and A
Mouth, B mouthfuls of connections, the T mouth of the second solenoid directional control valve 11 are connected to fuel tank 24, the A mouth and third ratio of the second solenoid directional control valve 11
One end connection of overflow valve 16, third check valve 17, third proportional pressure control valve 16, the other end of third check valve 17 and the second liquid
The connection of 23 cavity of resorption of cylinder pressure, the B mouth and the 4th proportional pressure control valve 19 of the second solenoid directional control valve 11, one end of the 4th check valve 18 connect
Connect, the 4th proportional pressure control valve 19, the 4th check valve 18 the other end connected with 23 epicoele of second hydraulic cylinder, in second hydraulic cylinder 23
Chamber entrance, which goes out, is connected with second pressure sensor 22；
Pressing component corresponding local loaded area when second hydraulic cylinder 23 works, in hydraulic press work, second is hydraulic
Second upper mold 26 needed for installing component shaping on the moved cross beam that cylinder 23 connects, the second solenoid directional control valve 11 control second hydraulic cylinder
23 oil inlet and oil return, 23 upper and lower cavity of second hydraulic cylinder all stops oil inlet when position in access, second hydraulic cylinder 23 when accessing left position
Cavity of resorption oil inlet epicoele oil return, 23 epicoele oil inlet cavity of resorption oil return of second hydraulic cylinder when accessing right position, the control of third check valve 17 second
The unidirectional oil inlet of 23 cavity of resorption of hydraulic cylinder, the 4th check valve 18 control the unidirectional oil inlet of 23 epicoele of second hydraulic cylinder, and third ratio is overflow
It flows valve 16 and sets up 23 cavity of resorption return pressure of second hydraulic cylinder；4th proportional pressure control valve 19 sets up 23 epicoele oil return pressure of second hydraulic cylinder
Power, second pressure sensor 22 measure the pressure of 23 epicoele of second hydraulic cylinder.
Working principle of the present invention are as follows:
For the present invention using multi-pass, the method for more local loadings step forming, which can be directly to different hydraulic
The pressure in cylinder different operating stage is regulated and controled, to guarantee pressure needed for different hydraulic cylinders reach different loading zones.In a fire
Continuous transformation loading zone in heating applies biggish shaping load to loading zone, and applies lesser constraint to non-loading zone and carry
Lotus.
In the present embodiment, setting load road frequency n is required according to workpiece local loading deflection, each load passage is set
Two local loading steps are set, according to formed features, first hydraulic cylinder 20 is as the first load step, and second hydraulic cylinder 23 is as last
Load step together.
In the present embodiment, power output system provides the load of maximum 10000kN, and intermediate and high pressure hydraulic pumps 1 can provide
The load of maximum 8000kN, while low-pressure hydraulic pump 8 can provide the load of maximum 2000kN.
(1) fast downlink:
After high-pressure hydraulic pump 1 starts, electromagnet 1YA, 6YA, 8YA are powered, the first solenoid directional control valve 10 and the second electromagnetism
11 right access systems of reversal valve, two hydraulic cylinder epicoele oil inlets, cavity of resorption hydraulic oil flow back to fuel tank；First proportional pressure control valve 12,
Two proportional pressure control valves 15, third proportional pressure control valve 16 and 19 pressure of the 4th proportional pressure control valve are turned down, and two hydraulic cylinder epicoeles can be quick
Oil inlet, cavity of resorption can rapid oil returns；The next access system of 4th solenoid directional control valve 5, pressure control 3 control chamber of inserted valve and the 5th ratio
Example overflow valve 6 is connected, and pressure control inserted valve 3 is opened and controls cavity pressure to be determined by 6 set pressure of the 5th proportional pressure control valve,
6 pressure of the 5th proportional pressure control valve of fast downlink stage is turned down, and the hydraulic oil that high-pressure hydraulic pump 1 pumps out is low pressure, and two hydraulic cylinders are living
Stopper rod can simultaneously fast downlink.
(2) downlink at a slow speed:
When two hydraulic cylinder piston rods come downwards to certain altitude, the 5th proportional pressure control valve 6, the first proportional pressure control valve 12 and third
16 pressure rise of proportional pressure control valve, 6 pressure of the 5th proportional pressure control valve are turned up to system working pressure, the pump output of high-pressure hydraulic pump 1
Hydraulic fluid pressure increase, two hydraulic cylinder cavity of resorption pressure rises, piston rod decrease speed slows down, at a slow speed close to workpiece, to certain
Height stops decline.In the present embodiment, the electromagnetism when the two upper mold lower surfaces that two-piston bar drives are c away from workpiece surface height
Iron 1YA is powered off, and position in the access of the 4th solenoid directional control valve 5, pressure control 3 control chamber of inserted valve is directly connected to fuel tank 24, high pressure liquid
1 hydraulic oil of press pump directly flows back to 24 off-load of fuel tank through pressure control inserted valve 3, and hydraulic oil stops entering system, and two hydraulic cylinders stop
Hydraulic oil is only passed in and out, two-piston bar stops decline.
(3) first partial load step:
Implement the first load step in this load passage, electromagnet 1YA, 3YA are powered, and third solenoid directional control valve 9 accesses a left side
Position, high-pressure hydraulic pump 1 is only to 20 fuel feeding of first hydraulic cylinder, and low-pressure hydraulic pump 8 is only to 23 fuel feeding of second hydraulic cylinder.
20 pressure of first hydraulic cylinder gradually rises and slowly downlink；Second hydraulic cylinder 23 remains stationary, corresponding upper mold and
Workpiece surface forms constraint gap c；19 pressure rise of third proportional pressure control valve 16 and the 4th proportional pressure control valve, second hydraulic cylinder 23
Epicoele continues oil inlet, and cavity of resorption stops disengaging hydraulic oil.
Referring to Fig. 2, the constraint gap c of the hydraulic system, lower die 28 keeps whole, and upper mold by the first upper mold 25 with
Second 26 liang of upper mold module composition, the first upper mold 25 is that the first loading system corresponds to upper mold, and the second upper mold 26 is the second load system
It unites and corresponds to upper mold.Shown in figure is hydraulic system first partial load step process signal, the in first partial load step
One upper mold 25 applies shaping load to loaded workpiece 27, and the second upper mold 26 only applies restraint forces to loaded workpiece 27,
The distance between second upper mold 26 and loaded workpiece 27 c are to constrain gap c.
23 epicoele of second hydraulic cylinder keeps confining pressure highest can be to 2000kN, according to actual needs can be by adjusting the 4th
The confining pressure of 19 pressure change second hydraulic cylinder of proportional pressure control valve, 23 epicoele, is in the present embodiment 2000kN.When the second pressure
Force snesor 22 detects 23 upper cavity pressure of second hydraulic cylinder to confining pressure, electromagnet 8YA power-off, the second solenoid directional control valve 11
Position in access, second hydraulic cylinder 23 stop disengaging hydraulic oil, and second hydraulic cylinder 23 keeps confining pressure.
20 piston rod of first hydraulic cylinder continues downlink, and 12 pressure of the first proportional pressure control valve gradually decreases, the second proportional overflow
15 pressure of valve gradually rises, and hydraulic oil goes successively to 20 epicoele of first hydraulic cylinder, and 20 pressure of first hydraulic cylinder gradually rises, at this
In embodiment, first hydraulic cylinder 20 keeps forming pressure highest can be to 8000kN, according to actual needs can be by adjusting the second ratio
The forming pressure of example 15 pressure change first hydraulic cylinder 20 of overflow valve, is in the present embodiment 8000kN.When first hydraulic cylinder 20
Electromagnet 1YA, 6YA are powered off after reaching the reduction in pass, and position in the access of the first solenoid directional control valve 10, first hydraulic cylinder 20 stops
Pass in and out hydraulic oil, 1 hydraulic oil of high-pressure hydraulic pump directly flows back to 24 off-load of fuel tank through pressure control inserted valve 3, hydraulic oil stop into
Enter system, 12 pressure rise of the first proportional pressure control valve, 20 pressure maintaining of first hydraulic cylinder.
During if second hydraulic cylinder 23 keeps confining pressure, when second pressure sensor 22 detects second hydraulic cylinder 23
Upper cavity pressure decline, then electromagnet 8YA is powered, and low-pressure hydraulic pump 8 passes through third solenoid directional control valve 9, the second solenoid directional control valve 11
And the 4th check valve 18 to 23 epicoele repairing of second hydraulic cylinder, electromagnet 8YA is powered off after pressure reaches confining pressure again.
(4) first partial load step is completed:
Electromagnet 4YA, 5YA are powered after first hydraulic cylinder 20 reaches the reduction in pass for a period of time, and third electromagnetism changes
Right position is accessed to valve 9, the first solenoid directional control valve 10 accesses left position, and low-pressure hydraulic pump 8 is only to 20 cavity of resorption fuel feeding of first hydraulic cylinder, and the
Two proportional pressure control valves, 15 pressure is turned down, and epicoele hydraulic oil directly flows back to fuel tank through the first solenoid directional control valve 10, and piston rod is lifted upwards
It rises, moved cross beam is driven to be lifted upwards, make after generating the constraint gap that distance is c between the first upper mold 25 and workpiece, the second ratio
Example 15 pressure rise of overflow valve, piston rod holding position are motionless.
(5) second local loadings step:
Implement the second load step in this load passage, electromagnet 1YA, 4YA, 6YA, 8YA are powered, third solenoid directional control valve
The 9 right positions of access, high-pressure hydraulic pump 1 is only to 23 fuel feeding of second hydraulic cylinder, and low-pressure hydraulic pump 8 is only to 20 fuel feeding of first hydraulic cylinder.
23 pressure of second hydraulic cylinder gradually rises and slowly downlink；First proportional pressure control valve, 12 pressure rise, the first liquid
20 epicoele of cylinder pressure continues oil return, and cavity of resorption stops disengaging hydraulic oil, when 20 epicoele of first hydraulic cylinder keeps confining pressure highest can be extremely
2000kN, according to actual needs can be by adjusting the about beam pressure of 15 pressure change first hydraulic cylinder of the second proportional pressure control valve, 20 epicoele
Power is in the present embodiment 2000kN.When first pressure sensor 21 detects 20 upper cavity pressure of first hydraulic cylinder to about beam pressure
Power, electromagnet 6YA are powered off, and position in the access of the first solenoid directional control valve 10, first hydraulic cylinder 20 stops disengaging hydraulic oil, and first is hydraulic
Cylinder 20 keeps confining pressure.
20 piston rod of first hydraulic cylinder continues downlink, and 16 pressure of third proportional pressure control valve gradually decreases, the 4th proportional overflow
Valve 19 gradually rises, and hydraulic oil goes successively to 23 epicoele of second hydraulic cylinder, and 23 pressure of second hydraulic cylinder gradually rises, and second is hydraulic
Cylinder 23 keeps forming pressure highest can be to 8000kN, according to actual needs can be by adjusting 19 pressure change of the 4th proportional pressure control valve
The forming pressure of second hydraulic cylinder 23 is in the present embodiment 8000kN.After second hydraulic cylinder 23 reaches the reduction in pass
Electromagnet 1YA, 8YA are powered off, and position in the access of the second solenoid directional control valve 11, second hydraulic cylinder 23 stops disengaging hydraulic oil, high pressure liquid
1 hydraulic oil of press pump directly flows back to 24 off-load of fuel tank through pressure control inserted valve 3, and hydraulic oil stops entering system, and third ratio is overflow
Flow 16 pressure rise of valve, 23 pressure maintaining of second hydraulic cylinder.
During if first hydraulic cylinder 20 keeps confining pressure, when first pressure sensor 21 detects first hydraulic cylinder 20
Upper cavity pressure decline, then electromagnet 6YA is powered, and low-pressure hydraulic pump 8 passes through third solenoid directional control valve 9, the first solenoid directional control valve 10
And second one-way valve 14, to 20 epicoele repairing of first hydraulic cylinder, electromagnet 6YA is powered off after pressure reaches confining pressure again.
(6) second local loadings step is completed:
Electromagnet 3YA, 7YA are powered after second hydraulic cylinder 23 reaches the reduction in pass for a period of time, and third electromagnetism changes
Left position is accessed to valve 9, for low-pressure hydraulic pump 8 only to 23 fuel feeding of second hydraulic cylinder, the second solenoid directional control valve 11 accesses left position, the 4th ratio
Example 19 pressure of overflow valve is turned down, and 23 cavity of resorption oil inlet of second hydraulic cylinder, epicoele hydraulic oil is directly flowed back to through the second solenoid directional control valve 11
Fuel tank, piston rod are lifted upwards, are driven moved cross beam to be lifted upwards, are made to generate distance between the second upper mold 26 and loaded workpiece 27
Behind the constraint gap of c, 19 pressure rise of the 4th proportional pressure control valve, piston rod holding position is motionless, at this time second hydraulic cylinder 23
The first upper mold 25 that the second upper mold 26 driven drives with first hydraulic cylinder 20 is in same level height.
(7) load passage transformation:
Directly step (8) are carried out if load passage has reached n times.
Step (3) to (6) are repeated if load passage does not reach n times until load passage is n times.
(8) pressure maintaining finishing:
Directly step (9) are carried out if not needing pressure maintaining finishing after load passage is completed.
If load passage needs pressure maintaining finishing after completing, step (9) are carried out after carrying out pressure maintaining finishing.
In the present embodiment, according to processing request, loaded workpiece 27 needs pressure maintaining.Electromagnet 1YA, 6YA, 8YA are powered, electricity
Magnet 3YA, 7YA power-off, for high-pressure hydraulic pump 1 simultaneously to two hydraulic cylinder epicoele fuel feeding, work is worked as in the synchronous decline of two hydraulic cylinder piston cylinders
When stopper rod encounters loaded workpiece 27, hydraulic oil goes successively to two hydraulic cylinder epicoeles, after two hydraulic cylinder piston rod dropping distance d,
Second proportional pressure control valve 15 gradually rises with 19 pressure of the 4th proportional pressure control valve, and dwell pressure highest can be to 8000kN, according to reality
Border demand can be by adjusting 19 pressure change dwell pressure of the second proportional pressure control valve 15 and the 4th proportional pressure control valve, in the present embodiment
In be 8000kN.When two hydraulic cylinder epicoeles reach dwell pressure, 16 pressure of the first proportional pressure control valve 12 and third proportional pressure control valve
It increases, electromagnet 1YA, 6YA power-off, two hydraulic cylinders stop disengaging hydraulic oil, and 1 hydraulic oil of high-pressure hydraulic pump is controlled through pressure and inserted
Valve 3 directly flows back to 24 off-load of fuel tank, and hydraulic oil stops entering system, two hydraulic cylinder pressure maintainings.
(9) it quickly returns:
In the present embodiment, when quick return, electromagnet 2YA, 5YA, 7YA are powered, electromagnet 3YA power-off, the 4th electricity
Magnetic reversal valve 5 accesses upper, and pressure controls inserted valve 3 and closes, and the hydraulic oil of high-pressure hydraulic pump 1 fully enters system, third electricity
Position in the access of magnetic reversal valve 9, high-pressure hydraulic pump 1 simultaneously to two hydraulic oil supply cylinders, hydraulic oil through high-pressure hydraulic pump 1, inserted valve 2,
Third solenoid directional control valve 9, the first solenoid directional control valve 10 and the second solenoid directional control valve 11 are hydraulic into first hydraulic cylinder 20 and second
23 cavity of resorption of cylinder；First proportional pressure control valve 12, the second proportional pressure control valve 15, third proportional pressure control valve 16 and the 4th proportional pressure control valve 19
Pressure is turned down, two hydraulic cylinder cavity of resorptions can quick oil feeding, epicoele can rapid oil return；First hydraulic cylinder 20 and 23 epicoele of second hydraulic cylinder
Hydraulic oil flows back to fuel tank 24 by the first solenoid directional control valve 10 and the second solenoid directional control valve 11, and two hydraulic cylinder piston rods quickly return
It returns.
Claims (2)
1. a kind of hydraulic system of local loading hydraulic press, including power output system, the first loading system and the second load system
System, it is characterised in that: the connection of the P mouth of power output system and third solenoid directional control valve (9), the A mouth of third solenoid directional control valve (9)
It is connected with the P mouth of the first solenoid directional control valve (10) of the first loading system；The B mouth of third solenoid directional control valve (9) and the second load
The P mouth connection of the second solenoid directional control valve (11) of system connection；
The power output system includes high-pressure hydraulic pump (1), high-pressure hydraulic pump (1) oil outlet respectively with inserted valve (2)
Oil inlet, pressure control the oil inlet connection of inserted valve (3), and the oil revolving end of high-pressure hydraulic pump (1) is connected to fuel tank (24), inserts
It after valve (2) control chamber is connect with inserted valve (2) oil outlet, and is connected with the P mouth of third solenoid directional control valve (9), pressure control is inserted
Valve (3) oil outlet connection fuel tank (24) is filled, while being connect with pressure regulator valve (4) one end, and the T mouth with the 4th solenoid directional control valve (5)
Connection；Pressure control inserted valve (3) control chamber is connect with pressure regulator valve (4) other end, and accesses the P of the 4th solenoid directional control valve (5)
Mouthful, the B mouth of the 4th solenoid directional control valve (5) is connected with the 5th proportional pressure control valve (6)；Middle position P mouthfuls of 4th solenoid directional control valve (5) with
T mouthfuls of connections；The T mouth of third solenoid directional control valve (9) is connected with the oil outlet of overflow valve (7), low-pressure hydraulic pump (8), overflow valve
(7), the oil revolving end of low-pressure hydraulic pump (8) is connected to fuel tank (24)；Middle position P mouthfuls of third solenoid directional control valve (9) and A mouthfuls, B mouthfuls of companies
It is logical；
First loading system includes the first solenoid directional control valve (10), and middle position T mouthfuls of the first solenoid directional control valve (10) and A
Mouthful, B mouthful connections, the T mouth of the first solenoid directional control valve (10) is connected to fuel tank (24), the A mouth of the first solenoid directional control valve (10) and the
One end connection of one proportional pressure control valve (12), the first check valve (13), the first proportional pressure control valve (12), the first check valve (13)
The other end is connected with first hydraulic cylinder (20) cavity of resorption；B mouthfuls of first solenoid directional control valve (10) and second one-way valve (14), the second ratio
One end of overflow valve (15) connects, the other end and first hydraulic cylinder of second one-way valve (14), the second proportional pressure control valve (15)
(20) epicoele connects, and first hydraulic cylinder (20) epicoele entrance is connected with first pressure sensor (21)；
Second loading system includes the second solenoid directional control valve (11), and middle position T mouthfuls of the second solenoid directional control valve (11) and A
Mouthful, B mouthful connections, the T mouth of the second solenoid directional control valve (11) is connected to fuel tank (24), the A mouth of the second solenoid directional control valve (11) and the
One end connection of three proportional pressure control valves (16), third check valve (17), third proportional pressure control valve (16), third check valve (17)
The other end is connected with second hydraulic cylinder (23) cavity of resorption, the B mouth of the second solenoid directional control valve (11) and the 4th proportional pressure control valve (19), the
One end of four check valves (18) connects, the other end and second hydraulic cylinder of the 4th proportional pressure control valve (19), the 4th check valve (18)
(23) epicoele connects, and second hydraulic cylinder (23) epicoele inlet is connected with second pressure sensor (22).
2. a kind of hydraulic system of local loading hydraulic press according to claim 1, it is characterised in that: described first adds
Loading system and the first upper mold (25) are corresponding, and the second loading system and the second upper mold (26) are corresponding, the first upper mold (25), the second upper mold
(26) combined type upper mold is formed, lower die (28) is an entirety.
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| CN201711270024.9A CN108167240B (en) | 2017-12-05 | 2017-12-05 | A kind of hydraulic system of local loading hydraulic press |
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| CN109667799A (en) * | 2018-12-24 | 2019-04-23 | 天津市环球汽车配件有限公司 | A kind of hydraulic system for hydraulic press |
| CN110185663B (en) * | 2019-05-30 | 2020-06-16 | 西安交通大学 | Local-loading multi-loading step type press hydraulic closed-loop control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3535877A (en) * | 1969-05-09 | 1970-10-27 | Gen Signal Corp | Three-pump hydraulic system incorporating an unloader |
| CN2637024Y (en) * | 2003-08-26 | 2004-09-01 | 苏州市越海拉伸机械有限公司 | Digital controlled hydraulic double acting stretching machine |
| DE102005029822A1 (en) * | 2005-04-01 | 2006-10-05 | Bosch Rexroth Aktiengesellschaft | Hydraulic transformation plant e.g. for hydraulic system, has multipart tool having tool part fastened to supporting element and moveable by two cylinders |
| CN103847129A (en) * | 2012-11-30 | 2014-06-11 | 无锡市协新气动有限公司 | Copper and aluminum scrap hydraulic briquetting press system |
| CN103148032B (en) * | 2013-03-26 | 2016-01-20 | 河海大学常州校区 | A kind of Study of Cyclic Loading hydraulic system |
| CN204436958U (en) * | 2014-12-23 | 2015-07-01 | 南京航空航天大学 | A kind of three-dimensional loads hydraulic pressure installation |
| CN106363076B (en) * | 2016-08-29 | 2019-01-08 | 天津市天锻压力机有限公司 | The hydraulic system of the hydraulic punching of Steel Tube Special in a kind of liquid-filling shaping hydraulic machine |
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