CN108425915A - The hydraulic system and hydraulic pressure processing method of hydraulic press - Google Patents

The hydraulic system and hydraulic pressure processing method of hydraulic press Download PDF

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Publication number
CN108425915A
CN108425915A CN201810222835.XA CN201810222835A CN108425915A CN 108425915 A CN108425915 A CN 108425915A CN 201810222835 A CN201810222835 A CN 201810222835A CN 108425915 A CN108425915 A CN 108425915A
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CN
China
Prior art keywords
valve
hydraulic
inserted valve
solenoid directional
directional control
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Granted
Application number
CN201810222835.XA
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Chinese (zh)
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CN108425915B (en
Inventor
乔礼惠
刘宁书
吴国健
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Jiangsu Yangli Group Co Ltd
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Jiangsu Yangli Group Co Ltd
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Priority to CN201810222835.XA priority Critical patent/CN108425915B/en
Publication of CN108425915A publication Critical patent/CN108425915A/en
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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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram
    • 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
    • B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/26—Programme control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
    • 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
    • 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
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

Abstract

The present invention relates to a kind of hydraulic system of hydraulic press and hydraulic pressure processing methods, the top center of prefill valve trip bolt is equipped with interior hexagonal counterbore, hexagonal plug tenon is embedded in interior hexagonal counterbore, the center of hexagonal plug tenon is equipped with plug tenon threaded hole, cam screw rod is screwed in plug tenon threaded hole, cam screw rod is connected to the lower face center of cam gear, and the circumference of cam gear is equipped with the cam groove axially extended；The flange counterbore periphery of prefill valve flange upper surface is adsorbed with strong magnet ring seat, is adsorbed with the fixed disk of switch above strong magnet ring seat, cam gear, strong magnet ring seat and the fixed disk of switch with prefill valve trip bolt coaxial line；Travel switch is fixed on the excircle of the fixed disk of switch, the probe of travel switch is in cam groove.It includes following action that hydraulic pressure, which processes each working cycles successively,：Under sliding block level-one is fast, under two level is fast, it is slow under, work push up, push up slowly, retract, stretch soon into pressurization, pressurize pressure release, sliding block backhaul, hydraulic die cushion, each cylinder is forced to retract.

Description

The hydraulic system and hydraulic pressure processing method of hydraulic press
Technical field
The present invention relates to a kind of hydraulic press, more particularly to a kind of hydraulic system of hydraulic press, the invention further relates to a kind of oil The hydraulic pressure processing method of press, belongs to machine tool control system technical field.
Background technology
Hydraulic press is to realize the fast downlink of slide block movement and meet opening speed requirement, usually all on sliding block oil cylinder Side's installation prefill valve, is used for the quick repairing and oil return of sliding block oil cylinder.The fast downlink of slider of oil press is to rely on sliding block and oil What the gravity of cylinder piston rod was realized, lower rate request soon is met by freely falling body, and the oil mass of oil pump is far from satisfaction at this time The supplement of cylinder upper cavity oil fluid needs, and filling liquid valve core is then opened under the suction function that epicoele generates so that in fuel tank Fluid is supplemented in cylinder upper cavity oil.When sliding block switch to work into when, the fuel feeding driving sliding block downlink at a slow speed of oil pump will be only relied at this time, Ask the spool of prefill valve that must tightly close, being such as not closed completely real will cause the fuel feeding of oil pump can not by prefill valve oil return box Drive sliding block operation.The release for carrying out cylinder upper cavity oil is acted after to be pressurised, requires prefill valve in the work of hydraulic control oil at this time With lower opening, as the spool of prefill valve be not switched on will be unable to so that upper cavity pressure is reduced to zero also if cannot achieve next time Journey acts.Filling liquid valve core is needed to be constantly in opening state in sliding block return stroke.
Prefill valve currently on the market is all casting or forging closed structure, can not understand the on off state of spool, can only It analyzed, judged by phenomenon combination hydraulic system the problem of sliding block emerged in operation, not intuitively.For example mold is closed and needs Cylinder upper cavity oil builds pressure and pressure can not built, and when having investigated oil pump, hydraulic system no problem, judging whether prefill valve leaks needs The observation panel opened on fuel tank sees whether oil pipe has oil return to judge, very inconvenient.
Prefill valve flange is attached by screw and sliding block oil cylinder, there are discontinuity equalization when being fastened such as screw, Be easy to loosen when work, prefill valve can be caused to fly out in a high voltage state when serious, and at present each producer screw it is anti- Loose warning device generally uses voltage sensitive sensor to be placed on the lower part of screw, and pressure is larger after screw fastening, once screw loosening, The pressure of screw fastening will reduce, and voltage sensitive sensor just has signal to receiving element, and sends out alarm by output element. The component requirements that such method uses are higher, and cost is also higher.
The hydraulic die cushion action control of hydraulic press all follows the control of sliding block, i.e. slider of oil press motion control and hydraulic pressure substantially It pads motion control and shares hydraulic power unit, pumping source is shared because existing from the point of view of action process, so after sliding blocks action can only be waited to stop It could carry out the action of hydraulic die cushion, and be intended to can be during sliding block backhaul by many users, hydraulic die cushion can realize synchronous top Go out, the time of waiting can be reduced while not influencing sliding block opening speed to improve production efficiency.
According to customer requirement deliberately two groups of pumps are respectively adopted in the slide block movement of hydraulic press and hydraulic die cushion movement by some producers The operation control of stand control, i.e. sliding block is controlled by upper pumping plant, and the control up and down of hydraulic die cushion is then controlled by lower pumping plant, at two groups of pumping plants In being completely independent state, installed power is increased, increases cost of investment, causes the waste of the energy.For such case, individually The drive cylinder of hydraulic die cushion is just modified to multi-cylinder structure by producer, and usually the mode of intermediate piston cylinder+both sides plunger case, passes through Oil pump feed is to intermediate piston cylinder and then hydraulic die cushion is driven to move upwards, and periphery plunger case carries out the mode of repairing by check valve It realizes quickly ejection, all oil cylinders is given by oil pump feed again when hydraulic die cushion is moved close to upper limit, to realize full tonnage top Go out, but can wherein have quickly ejection and turn break occur when full tonnage ejection, or even will appear and fall by a small margin, ejection speed Degree conversion is unstable, is caused by only relying on negative pressure repairing deficiency in quick ejection process because of plunger case.
Invention content
The primary purpose of the present invention is that overcoming problems of the prior art, a kind of hydraulic pressure system of hydraulic press is provided System can in time alarm to prefill valve loosening, and reliable in action is at low cost.
In order to solve the above technical problems, the hydraulic system of a kind of hydraulic press of the invention, including sliding block (1) and hydraulic die cushion (2), the lower section of sliding block oil cylinder is connected at the top of sliding block (1), the sliding block oil cylinder includes centrally located sliding block plunger case (1b) and sliding block master cylinder (1a) positioned at both sides, sliding block master cylinder (1a) and sliding block plunger case (1b) pass through prefill valve (CF1) respectively It is connected with fuel tank, the hydraulic control mouth of each prefill valve (CF1) is connected with prefill valve control oil pipe (G3) respectively, each prefill valve (CF1) Flange is fixed on by prefill valve trip bolt (9) on respective slide oil cylinder, the upper end difference of each prefill valve trip bolt (9) In flange counterbore, the top center of the prefill valve trip bolt is equipped with interior hexagonal counterbore, embedding in the interior hexagonal counterbore Equipped with hexagonal plug tenon, the center of the hexagonal plug tenon is equipped with plug tenon threaded hole, and cam screw rod is screwed in the plug tenon threaded hole, The cam screw rod is connected to the lower face center of cam gear, and the circumference of the cam gear is convex equipped with axially extending Take turns groove；The flange counterbore periphery of prefill valve flange upper surface is adsorbed with strong magnet ring seat, and the top of the strong magnet ring seat is inhaled With the fixed disk of switch, the cam gear, strong magnet ring seat and the fixed disk of switch with the prefill valve trip bolt coaxial line； It is fixed with travel switch on the excircle of the fixed disk of switch, the probe of the travel switch is in the cam groove.
Compared with the existing technology, the present invention achieves following advantageous effect：Strong magnet ring seat is by magnetic absorption in prefill valve On flange, switchs fixed disk and be adsorbed on strong magnet ring seat so that travel switch is able to be fixed on prefill valve flange；Cam gear It is fixedly connected with hexagonal plug tenon by cam screw rod, hexagonal plug tenon is plugged in the interior hexagonal counterbore of prefill valve trip bolt；When When prefill valve trip bolt loosens, prefill valve trip bolt rotates relative to prefill valve flange, and cam gear follows Prefill valve trip bolt rotates synchronously so that cam groove pushes the probe action of travel switch, sends out alarm signal.With tradition Voltage sensitive sensor compare, cost is greatly lowered, and it is reliable to alarm, and is directly adsorbed by strong magnet ring seat and hexagonal plug tenon Grafting so that installation is very convenient.
As an improvement of the present invention, the fixed disk of the switch includes centrally located inner disc and the outer toroid positioned at periphery, The outer toroid is adsorbed on the top of the strong magnet ring seat, and the inner disc is crushed on the lower section of the cam gear, the outer circle It is connected with each other by the fixation disk elastic spokes radially extended between the inner periphery of ring and the excircle of the inner disc.Fixed disk Relative position when elastic spokes make inner disc and outer toroid hold together and install is fixed, to ensure the spy of travel switch Head is accurately in the cam groove of cam gear；As long as cam gear has pico- rotation in work, row on the one hand can trigger Cheng Kaiguan, on the other hand fixed disk elastic spokes, which are twisted, is even twisted off.
As a further improvement on the present invention, the center of the cam gear is equipped with handle bar jack, and the handlebar stem is inserted It is plugged with handlebar stem in hole, bulb is connected at the top of the handlebar stem, edge is arranged on the circumference of the handlebar stem lower end The handle lever lock tooth extended radially out, the circumference of the handle bar jack are equipped with and compatible of the handle lever lock tooth Hand lever vertical slot and handlebar stem locked groove；The plug tenon threaded hole is mutually screwed on the cam screw rod by left hand thread.In cam Handle bar jack cam gear easy to remove is set on device, handlebar stem is inserted into the handle bar jack of cam gear, handle Lever lock tooth is downwardly into along handlebar stem vertical slot, is inserted into rotating handles bar behind bottom, so that handle lever lock tooth is embedded in handlebar stem locked groove, so After can be lifted up bulb hexagonal plug tenon is pulled away into prefill valve trip bolt；Conversely, when handlebar stem is in insert state, Cam gear is installed convenient for holding bulb.Since prefill valve trip bolt is right-handed thread, cam screw rod uses anti-pitch thread, when When prefill valve trip bolt loosens, cam screw rod only can connect even closer with hexagonal plug tenon.
As a further improvement on the present invention, each prefill valve (CF1) is configured with pressure difference transmitter, each pressure difference transmitter respectively Two pressure signal input ends be connected to the both ends of corresponding prefill valve；Main oil pump export pipeline (G2) is inserted with the 13rd respectively Dress valve (C13), the 14th inserted valve (C14) are connected with the entrance of the 15th inserted valve (C15), the 13rd inserted valve (C13) Outlet is connected with the entrance of the 12nd inserted valve (C12), the outlet of the 12nd inserted valve (C12) and sliding block plunger case (1b) and The epicoele of sliding block master cylinder (1a) is connected；The outlet of 15th inserted valve (C15) respectively with the 16th inserted valve (C16), the 17th Inserted valve (C17), the 18th inserted valve (C18) are connected with the entrance of the 19th inserted valve (C19), the 18th inserted valve (C18) Outlet be connected with sliding block master cylinder cavity of resorption oil circuit (G1), the 14th inserted valve (C14), the 16th inserted valve (C16), the 17th insert The outlet of dress valve (C17) and the 19th inserted valve (C19) is connected with fuel tank respectively；The hydraulic control mouth of 13rd inserted valve (C13) with The A mouths of 9th solenoid directional control valve (YV9) are connected, the 9th P mouths of solenoid directional control valve (YV9) and entering for the 13rd inserted valve (C13) Mouth is connected, and the T mouths of the 9th solenoid directional control valve (YV9) are connected with fuel tank；The hydraulic control mouth and the tenth electromagnetism of 14th inserted valve (C14) The B mouths of reversal valve (YV10) are connected；The hydraulic control mouth of 15th inserted valve (C15) is connected with the centre exit of the second shuttle valve (SF2), The left entry of second shuttle valve (SF2) is connected with the outlet of the 15th inserted valve (C15), the right entry of the second shuttle valve (SF2) and The A mouths of 11 solenoid directional control valves (YV11) are connected, P mouths and the 15th inserted valve (C15) of the 11st solenoid directional control valve (YV11) Entrance be connected；The hydraulic control mouth of 16th inserted valve (C16) is connected with the A mouths of the 12nd solenoid directional control valve (YV12), and the 12nd The P mouths of solenoid directional control valve (YV12) are connected with the entrance of the 16th inserted valve (C16)；The hydraulic control mouth of 17th inserted valve (C17) It is connected with the A mouths of the 13rd solenoid directional control valve (YV13), P mouths and the 17th inserted valve of the 13rd solenoid directional control valve (YV13) (C17) entrance is connected；The hydraulic control mouth of 18th inserted valve (C18) is connected with the A mouths of the 14th electromagnetic ball valve (YV14), The P mouths of 14th electromagnetic ball valve (YV14) are connected with the outlet of the 18th inserted valve (C18)；18th inserted valve (C18) Hydraulic control mouth be connected with the A mouths of the 15th solenoid directional control valve (YV15), pass through the 9th pressure regulator valve (F9) and the 15th electromagnetic switch The P mouths of valve (YV15) are connected, and are connected with the B mouths of the 15th solenoid directional control valve (YV15) by the tenth pressure regulator valve (F10)；Tenth electricity Magnetic reversal valve (YV10), the 11st solenoid directional control valve (YV11), the 12nd solenoid directional control valve (YV12), the 13rd solenoid directional control valve (YV13) it is connected respectively with fuel tank with the T mouths of the 14th electromagnetic ball valve (YV14), the B of the 15th solenoid directional control valve (YV15) Mouth is connected with fuel tank；14th electromagnetic ball valve (YV14) be two-bit triplet solenoid directional control valve, the ten, the 11,12,13 It is two four-way electromagnetic reversing valves with 15 solenoid directional control valves.
Under sliding block level-one is fast：9th solenoid directional control valve YV9 obtain it is electric so that the 13rd inserted valve C13 is opened, fluid is through the 13rd Inserted valve C13 and the 12nd inserted valve C12 fills into the epicoele and sliding block plunger case 1b of sliding block master cylinder 1a；12nd solenoid directional control valve YV12 obtain it is electric so that the 16th inserted valve C16 is opened, the 13rd solenoid directional control valve YV13 obtain it is electric so that the 17th inserted valve C17 is opened, 14th electromagnetic ball valve YV14, which is obtained, electric makes the 18th inserted valve C18 open；15th solenoid directional control valve YV15, which is obtained, electric makes 19 inserted valve C19 obtain the support of the 9th pressure regulator valve F9；16th electromagnetic ball valve YV16, which is obtained, electric makes the 20th inserted valve C20 is opened, and the 8th solenoid directional control valve YV8 obtains electric, the 11st inserted valve C11 openings, the fuel-displaced process cunning of sliding block master cylinder 1a rod cavities Block master cylinder cavity of resorption oil circuit G1, the 20th inserted valve C20 and the 11st inserted valve C11 carry out preacceleration inflation to accumulator AC.Sliding block two Under grade is fast：Remaining is remained unchanged, and the 12nd solenoid directional control valve YV12 dead electricity makes the 16th inserted valve C16 close, and prepares to sliding block Slowly lower transition.Under sliding block is slow：Remaining is remained unchanged, and the 16th electromagnetic ball valve YV16 dead electricity makes the 20th inserted valve C20 close It closes, sliding block master cylinder cavity of resorption oil circuit G1 terminates the preacceleration inflation of accumulator AC；Continued by the 11st inserted valve C11 by servopump B1 To accumulator AC pressurisings, after the completion of pressurising, the 8th solenoid directional control valve YV8 dead electricity, the 11st inserted valve C11 is closed, the 13rd electricity Magnetic reversal valve YV13 dead electricity makes the 17th inserted valve C17 close, and is prepared to enter into sliding block work into pressurization.Sliding block work is into pressurization：Sliding block The support force of master cylinder 1a cavity of resorptions passes through the 9th pressure regulator valve F9 controls by the 19th inserted valve C19.Pressure release after sliding block pressurize：9th Solenoid directional control valve YV9 dead electricity makes the 13rd inserted valve C13 close, and the 14th electromagnetic ball valve YV14 dead electricity makes the 18th inserting Valve C18 is closed, and the 15th solenoid directional control valve YV15 dead electricity makes the 19th inserted valve C19 close, remaining each solenoid directional control valve is protected It holds in power failure state.Sliding block backhaul：Tenth solenoid directional control valve YV10 obtain it is electric so that the 14th inserted valve C14 is closed, main oil pump outlet Pipeline G2 builds pressure；11st solenoid directional control valve YV11 obtains electric, the 15th inserted valve C15 openings；The pressure of main oil pump export pipeline G2 Power oil is by the 15th inserted valve C15 and pushes the cavity of resorption that the 18th inserted valve C18 enters sliding block master cylinder 1a open；Reverberation matrix method is by Ten pressure regulator valve F10 controls；Prefill valve control oil pipe G3 builds pressure, by each prefill valve CF1 open, the fluid of sliding block master cylinder 1a epicoeles and The fluid of sliding block plunger case 1b passes through prefill valve CF1 oil return boxes respectively.
As a further improvement on the present invention, the outlet phase of the epicoele of hydraulic die cushion piston cylinder (2a) and the 5th check valve (D5) Even, the entrance of the 5th check valve (D5) is connected with fuel tank；The entrance phase of the outlet of servopump (B1) and the tenth inserted valve (C10) Even, the hydraulic control mouth of the tenth inserted valve (C10) is connected with the B mouths of the 6th solenoid directional control valve (YV6), and the tenth inserted valve (C10's) goes out The T mouths of mouth and the 6th solenoid directional control valve (YV6) are connected with fuel tank, and the 6th solenoid directional control valve (YV6) is that two four-way electromagnetics change To valve.When hydraulic die cushion downlink, the 5th check valve D5 is inhaled out, and the fluid in fuel tank enters hydraulic die cushion through the 5th check valve D5 and lives The epicoele of plug cylinder 2a.When the 6th solenoid directional control valve YV6 dead electricity, the tenth inserted valve C10 is opened, the fluid warp of the outlets servopump B1 Tenth inserted valve C10 oil return boxes recycle；When hydraulic die cushion pushes up soon, the 6th solenoid directional control valve YV6 obtains electric, the tenth passes inserted valve C10 It closes, the outlet oil circuit of servopump B1 builds pressure, and the hydraulic control mouth of the tenth inserted valve C10 ensures servopump by the 6th pressure regulator valve F6 controls The operational safety of B1.When hydraulic die cushion stretches, and each cylinder is forced to retract, the 6th solenoid directional control valve YV6 returns to power failure state, by Ten inserted valve C10 are opened.
As a further improvement on the present invention, the bottom centre of hydraulic die cushion (2) is connected with hydraulic die cushion piston cylinder (2a), hydraulic pressure The four corners of pad (2) are connected with the top of hydraulic die cushion plunger case (2b) respectively, and the entrance of servopump (B1) is connected with fuel tank, The outlet of servopump (B1) is connected with the entrance of the first check valve (D1), the outlet of the first check valve (D1) respectively with hydraulic die cushion control The entrance on liquefaction road, the entrance of the 11st inserted valve (C11) and the 20th inserted valve (C20) is connected, the 11st inserted valve (C11) Hydraulic control mouth be connected with the P mouths of the 8th solenoid directional control valve (YV8), the A mouths of the 8th solenoid directional control valve (YV8) and the 20th inserted valve (C20) entrance is connected, the B mouth connected tanks of the 8th solenoid directional control valve (YV8), and the 8th solenoid directional control valve (YV8) is two four-ways The outlet of solenoid directional control valve, the 11st inserted valve (C11) is connected with accumulator (AC)；The outlet of 20th inserted valve (C20) with Sliding block master cylinder cavity of resorption oil circuit (G1) is connected, the hydraulic control mouth and the 16th electromagnetic ball valve (YV16) of the 20th inserted valve (C20) A mouths be connected, P mouths of the 16th electromagnetic ball valve (YV16) is connected with the outlet of the 20th inserted valve (C20), and the 16th is electric The T mouths of magnetic reversing globe valve (YV16) are connected with the entrance of the 20th inserted valve (C20), and the 16th electromagnetic ball valve (YV16) is Two-bit triplet solenoid directional control valve.Hydraulic die cushion drive cylinder is pacified respectively using centrally located hydraulic die cushion piston cylinder 2a and four corners Fill the structure of hydraulic die cushion plunger case 2b so that the drawing force of hydraulic die cushion 2 is evenly distributed, and passes through matching for hydraulic system and electric-control system It closes, can also realize that the quadrangle difference of hydraulic die cushion drawing force is adjustable.Make full use of the structure of sliding block master cylinder 1a and sliding block plunger case 1b Feature, when under sliding block 1 is fast, the 16th electromagnetic ball valve YV16 obtains electric, the 20th inserted valve C20 openings；8th electricity simultaneously Magnetic reversal valve YV8 obtains electric, the 11st inserted valve C11 openings, the fuel-displaced process sliding block master cylinder cavity of resorption oil circuit of sliding block master cylinder 1a rod cavities G1, the 20th inserted valve C20 and the 11st inserted valve C11 carry out preacceleration inflation to accumulator AC, on the one hand realize 1 weight of balance slide block The effect of amount, play sliding block it is fast under change a job into smooth transition, on the other hand can fully realize the energy conversion use.
As a further improvement on the present invention, the hydraulic die cushion control oil circuit includes the first to the 9th inserted valve, accumulator (AC) bottom is connected with the entrance of the 9th inserted valve (C9), the 9th outlet of inserted valve (C9) and entering for the 8th inserted valve (C8) Mouth is connected, and the outlet of the 8th inserted valve (C8) is connected with the main oil pipe of each hydraulic die cushion plunger case (2b)；8th inserted valve (C8) is set There are opening regulation handle, the hydraulic control mouth of the 9th inserted valve (C9) to be connected with the A mouths of the 7th solenoid directional control valve (YV7), the 7th electromagnetism Reversal valve (YV7) is two four-way electromagnetic reversing valves, the 7th P mouths of solenoid directional control valve (YV7) and entering for the 9th inserted valve (C9) Mouth is connected, and the T mouths of the 7th solenoid directional control valve (YV7) are connected with fuel tank.When hydraulic die cushion 2 quickly ejects, the 8th solenoid directional control valve YV8 and the 16th equal dead electricity of electromagnetic ball valve YV16, the 11st inserted valve C11 and the 20th inserted valve C20 are closed；7th electricity Magnetic reversal valve YV7 obtains electric, the 9th inserted valve C9 is opened, and flow is adjusted by adjusting the opening regulation handle of the 8th inserted valve C8 Size, the pressure oil stored in accumulator AC enter four hydraulic die cushion plunger cases by the 9th inserted valve C9 and the 8th inserted valve C8 In 2b, realizes and quick repairing is carried out to the hydraulic die cushion plunger case 2b positioned at surrounding using accumulator AC.Because ejection run when pair Hydraulic die cushion plunger case 2b is eliminated when quickly ejection turns to eject at a slow speed using accumulator AC quick repairings with pressure and is fallen, pauses Phenomenon so that entire ejection movement realizes smooth transition.In conjunction with use servo-pump control technology, it can be achieved that accurate pressure and The control of torque, the effectively save energy.
As further improvement of the invention, the entrance of third inserted valve C3 and the 5th inserted valve C5 are unidirectional with first respectively The outlet of valve D1 is connected, the outlet of third inserted valve C3 respectively with the first inserted valve C1, the second inserted valve C2 and the 4th inserted valve The entrance of C4 is connected, and the outlet of the first inserted valve C1 is connected with the cavity of resorption of hydraulic die cushion piston cylinder 2a, the outlet of the second inserted valve C2 And the 7th the entrance of inserted valve C7 be connected respectively with the hydraulic fluid port of hydraulic die cushion plunger case 2b；The outlet of 5th inserted valve C5 is respectively with The entrance of six inserted valve C6 and the epicoele of hydraulic die cushion piston cylinder 2a are connected, and the 4th inserted valve C4, the 6th inserted valve C6 and the 7th are inserted The outlet of dress valve C7 is connected with fuel tank respectively, and the side of hydraulic die cushion 2 is equipped with hydraulic die cushion displacement sensor S1；First inserted valve C1 Hydraulic control mouth be connected with the A mouths of the first electromagnetic ball valve YV1, the first electromagnetic ball valve YV1 be two-bit triplet electromagnetic switch The P mouths of valve, the first electromagnetic ball valve YV1 are connected with the outlet of the first inserted valve C1, the T mouths of the first electromagnetic ball valve YV1 It is connected with fuel tank；The hydraulic control mouth of second inserted valve C2 is connected with the A mouths of the second solenoid directional control valve YV2, the second solenoid directional control valve YV2 P mouths for two four-way electromagnetic reversing valves, the second solenoid directional control valve YV2 are connected with the entrance of the second inserted valve C2, the second electromagnetism The T mouths of reversal valve YV2 are connected with fuel tank；The hydraulic control mouth of third inserted valve C3 is connected with the centre exit of the first shuttle valve SF1, and first The right end entrance of shuttle valve SF1 is connected with the outlet of third inserted valve C3, left end entrance and the third electromagnetic switch of the first shuttle valve SF1 The A mouths of valve are connected, and third solenoid directional control valve is the three-position four-way electromagnetic directional valve that Median Function is p-type, third solenoid directional control valve B mouths be connected with the hydraulic control mouth of the 5th inserted valve C5；The P mouths of third solenoid directional control valve are connected with the outlet of the 4th inserted valve C4, The T mouths of third solenoid directional control valve are connected with the outlet of third check valve D3, the entrance and the 5th inserted valve C5 of third check valve D3 Entrance be connected；The B mouths of third solenoid directional control valve are connected with the entrance of the second check valve D2, the outlet of the second check valve D2 and the The hydraulic control mouth of four inserted valve C4 is connected, and the hydraulic control mouth of the 4th inserted valve C4 is also connected by third pressure regulator valve F3 with fuel tank；Third The A mouths of solenoid directional control valve are also connected with the outlet of the 4th check valve D4, the entrance of the 4th check valve D4 and the 6th inserted valve C6's Hydraulic control mouth is connected, and the hydraulic control mouth of the 6th inserted valve C6 is also connected by the 4th pressure regulator valve F4 with fuel tank；The liquid of 7th inserted valve C7 Control mouth is connected with the B mouths of the 5th solenoid directional control valve YV5, and the 5th solenoid directional control valve YV5 is two four-way electromagnetic reversing valves, the 5th electricity The T mouths of magnetic reversal valve YV5 are connected with the outlet of the 7th inserted valve C7.
Hydraulic die cushion pushes up soon：Hydraulic die cushion 2 quickly ejects, while the 9th inserted valve C9 is opened, the first electromagnetic ball valve YV1 Obtain electric, the first inserted valve C1 openings；The left electromagnet YV4 of third solenoid directional control valve obtains electric, third inserted valve C3 openings；Servo The pressure oil of pump B1 outputs enters the cavity of resorption of hydraulic die cushion piston cylinder 2a, liquid followed by third inserted valve C3 and the first inserted valve C1 The epicoele fluid of pressure pad piston cylinder 2a flows back to fuel tank through the 6th inserted valve C6.Hydraulic die cushion pushes up slowly：As hydraulic die cushion displacement sensor S1 It detects after hydraulic die cushion 2 rises to setting position, the 7th solenoid directional control valve YV7 dead electricity makes the 9th inserted valve C9 close, accumulator AC stops to four hydraulic die cushion plunger case 2b repairings；Second solenoid directional control valve YV2 obtain it is electric so that the second inserted valve C2 is opened, servopump The pressure oil of B1 outputs switchs to eject at a slow speed into hydraulic die cushion piston cylinder 2a and four hydraulic die cushion plunger case 2b, hydraulic die cushion 2 simultaneously, The ejection control of hydraulic die cushion 2 can be realized using the servopump B1 of small displacement.Using servopump B1 combination hydraulic die cushion displacement sensings Device S1 can realize accurately controlling for 2 ejection position of hydraulic die cushion by closing also operation control, improve the one-pass molding rate of part.Liquid Each cylinder of pressure pad is retracted：First electromagnetic ball valve YV1 and the second solenoid directional control valve YV2 are kept as electricity, make the first inserted valve C1 and Second inserted valve C2 is stayed open；The right electromagnet YV3 of third solenoid directional control valve obtain it is electric make third inserted valve C3 close；4th inserts Dress valve C4 is opened because of hydraulic control mouth release, and the fluid of hydraulic die cushion piston cylinder 2a cavity of resorptions passes through the first inserted valve C1 and the 4th inserted valve C4 oil return boxes；Simultaneously the 5th solenoid directional control valve YV5 obtain it is electric so that the 7th inserted valve C7 is opened, the fluid warp in hydraulic die cushion plunger case 2b Cross the second inserted valve C2, the 4th inserted valve C4 and the 7th inserted valve C7 oil return boxes.Hydraulic die cushion stretches, and each cylinder is forced to retract：The One electromagnetic ball valve YV1, the second solenoid directional control valve YV2 are kept as electricity, and the first inserted valve C1 and the second inserted valve C2 is made to keep It opens；Right electromagnet YV3 dead electricity makes third solenoid directional control valve return to middle position, and the 4th inserted valve C4 is stayed open；5th electromagnetism changes The 7th inserted valve C7 is set to close to valve YV5 dead electricity, the fluid of hydraulic die cushion piston cylinder 2a cavity of resorptions passes through the first inserted valve C1 and the 4th Inserted valve C4 oil return boxes；Fluid in hydraulic die cushion plunger case 2b passes through the second inserted valve C2 and the 4th inserted valve C4 oil return boxes, draws The power stretched is controlled by the third pressure regulator valve F3 of the 4th inserted valve C4.
As further improvement of the invention, the servo motor M1 and each solenoid directional control valve of servopump B1 are controlled by control System, the control system include PLC controller and servo controller SDR, and accumulator AC and the 11st inserted valve C11 export it Between pipeline on be connected with pressure switch H1, the hydraulic pressure of the signal output end access PLC controller of hydraulic die cushion displacement sensor S1 Pad displacement signal input terminal IN1；The prefill valve pressure difference signal output end access PLC controller of pressure difference transmitter KP1-KP3 is filled Liquid valve pressure difference signal input terminal IN2-IN4；The high-pressure closing normally open contact H1-1 of pressure switch H1 is connected on the height of PLC controller It presses between 000 port of signal input part and DC power cathode VDC-, the low pressure of pressure switch H1 disconnects normally closed interlock H1-2 strings It is associated between 001 port of low-voltage signal input terminal of PLC controller and DC power cathode VDC-；The high-low pressure of PLC controller 002 port of switching signal output end is connected with the servopump switching signal input terminal MC of servo controller SDR；PLC controller Flow analog signals positive output end OUT1 is connected with the flow analog signals positive input terminal AI3 of servo controller SDR, PLC controls The flow analog signals negative input end FAC3 of the flow analog signals negative output terminal COM1 and servo controller SDR of device are connected；PLC The pressure simulation signal positive input terminal AI2 of the pressure simulation signal positive output end OUT2 and servo controller SDR of controller are connected, The pressure simulation signal negative input end FAC2 of the pressure simulation signal negative output terminal COM2 and servo controller SDR of PLC controller It is connected；Servo enables button SB1 and is connected between the enabling signal input terminal DI3 of servo controller SDR and common end COM；Inspection Survey the servopump pressure signal input end AI1 of the pump intake pressure sensor P1 and servo controller SDR of servopump B1 output pressures It is connected.
It presses servo and enables button SB1, servo controller SDR devotes oneself to work.When under sliding block is fast, sliding block master cylinder 1a rod cavities It is fuel-displaced that preacceleration inflation carried out to accumulator AC, sliding block turn it is slow it is lower after, continued from servopump B1 to accumulator AC pressurisings, until pressure is opened The high-pressure closing normally open contact H1-1 for closing H1 is closed, and the signal that accumulator AC is reached to high pressure is input to the height of PLC controller 000 port of signal input part, PLC controller is pressed to make the 8th solenoid directional control valve YV8 dead electricity, the 11st inserted valve C11 is closed, accurate The standby sliding block work that enters is into pressurization.When hydraulic die cushion 2 quickly ejects, the pressure oil stored in accumulator AC quickly fills into four hydraulic die cushions In plunger case 2b.When hydraulic die cushion pushes up slowly, setting position or storage are risen to when hydraulic die cushion displacement sensor S1 detects hydraulic die cushion 2 Energy device AC is reduced to low pressure, and the low pressure of pressure switch H1 disconnects normally closed interlock H1-2 and disconnects, and PLC controller makes the 7th electromagnetic switch Valve YV7 dead electricity, the 9th inserted valve C9 are closed, and accumulator AC stops to four hydraulic die cushion plunger case 2b repairings；Second electromagnetic switch Valve YV2 obtain it is electric so that the second inserted valve C2 is opened, the pressure oil of servopump B1 outputs enters hydraulic die cushion piston cylinder 2a and four simultaneously Hydraulic die cushion plunger case 2b, hydraulic die cushion 2 switch to eject at a slow speed.Using servopump B1 combinations hydraulic die cushion displacement sensor S1 by closing also Operation control can realize accurately controlling for 2 ejection position of hydraulic die cushion, improve the one-pass molding rate of part.Servopump B1 include by The low-lift pump and high-pressure pump of the same servo motor M1 drivings, when hydraulic die cushion pushes up soon and hydraulic die cushion pushes up slowly, the height of PLC controller 002 port of low pressure switching signal output end switches the servopump of servopump B1 low pressure operation signals input servo controller SDR Signal input part MC makes servo motor M1 drive low pressure pump operation.When each cylinder of hydraulic die cushion is retracted, the high-low pressure of PLC controller Servopump B1 high-voltage operation signals are inputted the servopump switching signal of servo controller SDR by 002 port of switching signal output end Input terminal MC makes servo motor M1 drive high pressure pump operation.When the flow analog signals positive output end OUT1 of PLC controller will flow When amount increase analog signal is sent to the flow analog signals positive input terminal AI3 of servo controller SDR, servo motor M1 controls are watched Clothes pump B1 increases flow output.When flow is reduced analog signal hair by the flow analog signals negative output terminal COM1 of PLC controller When sending to the flow analog signals negative input end FAC3 of servo controller SDR, servo motor M1 control servopumps B1 reduces flow Output.When pressure increase analog signal is sent to servo controller by the pressure simulation signal positive output end OUT2 of PLC controller When the pressure simulation signal positive input terminal AI2 of SDR, servo motor M1 control servopumps B1 improves oil pressure.When PLC controller Pressure reduction analog signal is sent to the pressure simulation signal of servo controller SDR by pressure simulation signal negative output terminal COM2 When negative input end FAC2, servo motor M1 control servopumps B1 reduces oil pressure.Pressure difference transmitter KP1, KP2, KP3 will accordingly fill The pressure difference signal of liquid valve is sent into the prefill valve pressure difference signal input terminal (IN2, IN3, IN4) of PLC controller, such as the pressure difference of prefill valve Signal is not in the range of PLC controller is set, and PLC controller will not provide flow to servopump, pressure instruction also would not Form backhaul action；Calibration range can be configured by touch screen, only when the pressure difference signal of prefill valve is in the model of setting Enclose it is interior can just carry out backhaul action, otherwise will appear on touch screen warning message and sound ring alarm.
It is another object of the present invention to overcome problems of the prior art, provide a kind of using hydraulic press liquid The method that pressure system carries out hydraulic pressure processing, sliding block can be made full use of fast under when energy, realize change a job under sliding block is fast into it is flat Steady transition.
In order to solve the above technical problems, the method that the present invention carries out hydraulic pressure processing using oil pressure machine hydraulic system, hydraulic press Each working cycles include following action successively：(1) under sliding block level-one is fast：13rd inserted valve C13 is opened, and fluid fills into cunning The epicoele and sliding block plunger case 1b of block master cylinder 1a；11st inserted valve C11, the 16th inserted valve C16, the 17th inserted valve C17, 18th inserted valve C18 and the 20th inserted valve C20 are opened, and the fuel-displaced of sliding block master cylinder 1a rod cavities carries out preliminary filling to accumulator AC Pressure；(2) under sliding block two level is fast：12nd solenoid directional control valve YV12 dead electricity makes the 16th inserted valve C16 close；(3) under sliding block is slow：The 20 inserted valve C20 are closed, and the preacceleration inflation of accumulator AC terminates；Continued from servopump B1 to accumulator AC pressurisings, pressurising is completed The 11st inserted valve C11 and the 17th inserted valve C17 are closed afterwards；(4) sliding block work is into pressurization：The support force of sliding block master cylinder 1a cavity of resorptions By the 9th pressure regulator valve F9 controls；(5) pressure release after sliding block pressurize：13rd inserted valve C13, the 18th inserted valve C18 and the 19th are inserted It fills valve C19 to close, remaining each solenoid directional control valve is held in power failure state；(6) sliding block backhaul：14th inserted valve C14 is closed, 15th inserted valve C15 is opened, and the pressure oil of main oil pump export pipeline G2 enters the cavity of resorption of sliding block master cylinder 1a；Reverberation matrix method is by Ten pressure regulator valve F10 controls；Each prefill valve CF1 is opened, and the fluid of sliding block master cylinder 1a epicoeles and sliding block plunger case 1b are respectively by filling Liquid valve CF1 oil return boxes；(7) hydraulic die cushion pushes up soon：11st inserted valve C11 and the 20th inserted valve C20 are closed, the 9th inserted valve C9 It opens, the pressure oil in accumulator AC quickly fills into four hydraulic die cushion plunger case 2b；The first inserted valve C1, third are inserted simultaneously It fills valve C3 to open, the pressure oil of servopump B1 outputs enters the cavity of resorption of hydraulic die cushion piston cylinder 2a, the epicoele of hydraulic die cushion piston cylinder 2a Fluid flows back to fuel tank through the 6th inserted valve C6；(8) hydraulic die cushion pushes up slowly：After hydraulic die cushion 2 rises to setting position, the 9th inserted valve C9 is closed, and accumulator AC stops to four hydraulic die cushion plunger case 2b repairings；Second inserted valve C2 is opened, the pressure of servopump B1 outputs Power oil enters hydraulic die cushion piston cylinder 2a and four hydraulic die cushion plunger case 2b simultaneously；(9) each cylinder of hydraulic die cushion is retracted：Third inserted valve C3 It closes, the 4th inserted valve C4 and the 7th inserted valve C7 are opened, the fluid and hydraulic die cushion plunger case 2b of hydraulic die cushion piston cylinder 2a cavity of resorptions In fluid oil return box；(10) hydraulic die cushion stretches, and each cylinder is forced to retract：Third solenoid directional control valve returns to middle position, the 7th inserted valve C7 is closed, and the fluid oil return box in hydraulic die cushion piston cylinder 2a cavity of resorptions and hydraulic die cushion plunger case 2b, the power of stretching is by third pressure regulator valve F3 is controlled.
Compared with the existing technology, the present invention achieves following advantageous effect：The hydraulic press using sliding block it is fast under when rod cavity It is fuel-displaced that preacceleration inflation is carried out to accumulator AC, it can the effectively save energy；When hydraulic die cushion quickly ejects, using accumulator AC to four The quick repairings of hydraulic die cushion plunger case 2b, and eliminate when quickly ejection turns to eject at a slow speed and fall, break so that entire top Going out movement realizes smooth transition.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, attached drawing only provide with reference to Illustrate to use, it is non-limiting the present invention.
Fig. 1 be hydraulic press of the present invention hydraulic system in the locking alarm mechanism of prefill valve front view.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the stereogram of Fig. 1.
Fig. 4 is the explosive view of Fig. 3.
Fig. 5 be Fig. 1 in along the sectional view of A-A.
Fig. 6 is installation diagram of the locking alarm mechanism on prefill valve flange in Fig. 1.
Fig. 7 is the hydraulic system principle figure of hydraulic press of the present invention.
Fig. 8 is the electric control theory figure of the Hydraulic system and control method of hydraulic press of the present invention.
In figure：1. sliding block；1a. sliding block master cylinders；1b. sliding block plunger cases；2. hydraulic die cushion；2a. hydraulic die cushion piston cylinders；2b. liquid Pressure pad plunger case；3. cam gear；3a. cam screw rods；3b. cam grooves；3c. handlebar stem locked grooves；3d. handlebar stem vertical slots；4. Strong magnet ring seat；5. the fixed disk of switch；5a. fixes valve snail column；5b. fixes disk elastic spokes；6. travel switch；6a. pops one's head in；7. Hand lever；7a. bulbs；7b. handle lever lock teeth；8. prefill valve flange；9. prefill valve trip bolt；10. hexagonal plug tenon；B1. servo Pump；M1. servo motor；AC. accumulator；C1. third inserted valve；C2. the second inserted valve；C3. third inserted valve；C4. it the 4th inserts Fill valve；C5. the 5th inserted valve；C6. the 6th inserted valve；C7. the 7th inserted valve；C8. the 8th inserted valve；C9. the 9th inserted valve； C10. the tenth inserted valve；C11. the 11st inserted valve；C12. the 12nd inserted valve；C13. the 13rd inserted valve；C14. the ten four Inserted valve；C15. the 15th inserted valve；C16. the 16th inserted valve；C17. the 17th inserted valve；C18. the 18th inserted valve； C19. the 19th inserted valve；C20. the 20th inserted valve；CF1. prefill valve；D1. the first check valve；D2. the second check valve；D3. Third check valve；D4. the 4th check valve；D5. the 5th check valve；H1. pressure switch；KP1, KP2, KP3. pressure difference transmitter； YV1. the first electromagnetic ball valve；YV2. the second solenoid directional control valve；YV3, YV4. third solenoid directional control valve；YV5. the 5th electromagnetism changes To valve；YV6. the 6th solenoid directional control valve；YV7. the 7th solenoid directional control valve；YV8. the 8th solenoid directional control valve；YV9. the 9th electromagnetism changes To valve；YV10. the tenth solenoid directional control valve；YV11. the 11st solenoid directional control valve；YV12. the 12nd solenoid directional control valve；YV13. 13 solenoid directional control valves；YV14. the 14th electromagnetic ball valve；YV15. the 15th solenoid directional control valve；YV16. the 16th electromagnetism Reversing globe valve；G1. sliding block master cylinder cavity of resorption oil circuit；G2. main oil pump export pipeline；G3. prefill valve control oil pipe；SF1. the first shuttle Valve；SF2. the second shuttle valve；S1. hydraulic die cushion displacement sensor；F1. the first pressure regulator valve；F2. the second pressure regulator valve；F3. third pressure regulation Valve；F4. the 4th pressure regulator valve；F5. the 5th pressure regulator valve；F6. the 6th pressure regulator valve；F7. the 7th pressure regulator valve；F8. the 8th pressure regulator valve；F9. 9th pressure regulator valve；F10. the tenth pressure regulator valve；F11. the 11st pressure regulator valve；SDR. servo controller；PG. encoder；SB1. servo Enabled button；EM1. filter；R. braking resistor.
Specific implementation mode
As shown in Figures 1 to 6, the prefill valve flange 8 of each prefill valve is solid by prefill valve trip bolt 9 respectively in the present invention It is scheduled on respective slide oil cylinder, the upper end of prefill valve trip bolt 9 is located in flange counterbore, the top of prefill valve trip bolt 9 Portion center is equipped with interior hexagonal counterbore, and hexagonal plug tenon 10 is embedded in interior hexagonal counterbore, and the center of hexagonal plug tenon 10 is equipped with plug tenon spiral shell Pit is screwed with cam screw rod 3a in plug tenon threaded hole, and cam screw rod 3a is connected to the lower face center of cam gear 3, cam The circumference of device 3 is equipped with the cam groove 3b axially extended；The flange counterbore periphery of prefill valve flange upper surface is adsorbed with The top of strong magnet ring seat 4, strong magnet ring seat 4 is adsorbed with the fixed disk 5 of switch, and cam gear 3, strong magnet ring seat 4 and switch fix disk 5 With 9 coaxial line of prefill valve trip bolt；It switchs and is fixed with travel switch 6, the probe of travel switch 6 on the excircle of fixed disk 5 6a is embedded in cam groove 3b.
Strong magnet ring seat 4 on prefill valve flange, switchs fixed disk 5 and is adsorbed on strong magnet ring seat 4 by magnetic absorption so that Travel switch 6 is able to be fixed on prefill valve flange；Cam gear 3 is fixedly connected by cam screw rod 3a with hexagonal plug tenon 10, Hexagonal plug tenon 10 is plugged in the interior hexagonal counterbore of prefill valve trip bolt 9；When prefill valve trip bolt 9 loosens, fill Liquid valve trip bolt 9 rotates relative to prefill valve flange, and cam gear 3 follows prefill valve trip bolt 9 to rotate synchronously, and makes The probe 6a actions that cam groove 3b pushes travel switch 6 are obtained, alarm signal is sent out.Compared with traditional voltage sensitive sensor, at Originally it is greatly lowered, and it is reliable to alarm, and is directly adsorbed by strong magnet ring seat 4 and the grafting of hexagonal plug tenon 10 so that installation ten It is convenient to divide.
The center of cam gear 3 is equipped with handle bar jack, and handlebar stem 7, the top of handlebar stem 7 are plugged in handle bar jack It is connected with bulb 7a, the handle lever lock tooth 7b radially stretched out is arranged on the circumference of 7 lower end of handlebar stem, handlebar stem is inserted The circumference in hole is equipped with handlebar stem vertical slot 3d compatible with handle lever lock tooth 7b and handlebar stem locked groove 3c.On cam gear 3 Handle bar jack cam gear 3 easy to remove is set, handlebar stem 7 is inserted into the handle bar jack of cam gear 3, handle lever lock Tooth 7b is downwardly into along handlebar stem vertical slot, is inserted into rotating handles bar 7 behind bottom, makes handle lever lock tooth 7b insertion handlebar stem locked grooves 3c In, it then can be lifted up bulb 7a and hexagonal plug tenon 10 is pulled away into prefill valve trip bolt 9.It is inserted conversely, handlebar stem 7 is in When entering state, also allow for holding bulb 7a installation cam gears 3.
Plug tenon threaded hole is mutually screwed on cam screw rod 3a by left hand thread.Since prefill valve trip bolt 9 is dextrorotation Screw thread, cam screw rod 3a uses anti-pitch thread, when prefill valve trip bolt 9 loosens, cam screw rod 3a and hexagonal plug tenon 10 can connect even closer.
The fixed disk 5 of switch includes centrally located inner disc and the outer toroid positioned at periphery, and outer toroid is adsorbed on strong magnet ring seat 4 Top, inner disc is crushed on the lower section of cam gear 3, by radially prolonging between the inner periphery of outer toroid and the excircle of inner disc The fixation disk elastic spokes 5b stretched is connected with each other.Fixed disk elastic spokes 5b can be arranged with three.Fixed disk elastic spokes Relative position when 5b makes inner disc and outer toroid hold together and installs is fixed, and the probe to ensure travel switch 6 is accurate Really in the cam groove 3b of cam gear 3；Outer toroid is adsorbed on strong magnet ring seat 4 and remains stationary as in work, as long as filling liquid Valve trip bolt 9 loosens, then cam gear 3 rotates, and on the one hand can trigger travel switch 6, on the other hand fixed Disk elastic spokes 5b is twisted or even is twisted off.
The fixation valve snail column 5a holded up upwards is welded on the top surface of outer toroid, travel switch 6 is fixed on fixed valve snail column On 5a.
As shown in Figure 7 and Figure 8, the hydraulic system of hydraulic press of the present invention includes sliding block 1 and hydraulic die cushion 2, in the top of sliding block 1 The heart is connected to the lower end of sliding block plunger case 1b, and sliding block master cylinder 1a, sliding block master cylinder are arranged at left and right sides of sliding block plunger case 1b The piston of 1a is connected with sliding block 1 respectively；The bottom centre of hydraulic die cushion 2 is connected with hydraulic die cushion piston cylinder 2a, and the four of hydraulic die cushion 2 A corner is connected with the top of hydraulic die cushion plunger case 2b respectively, and the entrance of servopump B1 is connected with fuel tank, and servopump B1's goes out Mouth is connected with the entrance of the first check valve D1, and the outlet of the first check valve D1 is inserted with hydraulic die cushion control oil circuit, the 11st respectively The entrance of the entrance of valve C11 and the 20th inserted valve C20 are connected, the hydraulic control mouth and the 8th electromagnetic switch of the 11st inserted valve C11 The P mouths of valve YV8 are connected, and the A mouths of the 8th solenoid directional control valve YV8 are connected with the entrance of the 20th inserted valve C20, the 8th electromagnetic switch The B mouth connected tanks of valve YV8, the 8th solenoid directional control valve YV8 are two four-way electromagnetic reversing valves, the outlet of the 11st inserted valve C11 It is connected with accumulator AC；The outlet of 20th inserted valve C20 is connected with sliding block master cylinder cavity of resorption oil circuit G1, the 20th inserted valve C20 Hydraulic control mouth be connected with the A mouths of the 16th electromagnetic ball valve YV16, the P mouths and the 20th of the 16th electromagnetic ball valve YV16 The outlet of inserted valve C20 is connected, and the T mouths of the 16th electromagnetic ball valve YV16 are connected with the entrance of the 20th inserted valve C20, the 16 electromagnetic ball valve YV16 are two-bit triplet solenoid directional control valve, and the 7th pressure regulator valve F7 is equipped between accumulator AC and fuel tank.
Hydraulic die cushion drive cylinder installs hydraulic pressure pad post respectively using centrally located hydraulic die cushion piston cylinder 2a and four corners The structure of plug cylinder 2b so that the drawing force of hydraulic die cushion 2 is evenly distributed, also can be real by the cooperation of hydraulic system and electric-control system The quadrangle difference of existing hydraulic die cushion drawing force is adjustable.The design feature for making full use of sliding block master cylinder 1a and sliding block plunger case 1b, in cunning When under block 1 is fast, the 16th electromagnetic ball valve YV16 obtains electric, the 20th inserted valve C20 openings；8th solenoid directional control valve simultaneously YV8 obtains electric, the 11st inserted valve C11 openings, the fuel-displaced process sliding block master cylinder cavity of resorption oil circuit G1 of sliding block master cylinder 1a rod cavities, the 20th Inserted valve C20 and the 11st inserted valve C11 carries out preacceleration inflation to accumulator AC, on the one hand realizes the effect of 1 weight of balance slide block, Play sliding block it is fast under change a job into smooth transition, on the other hand can fully realize the energy conversion use.
It includes the first to the 9th inserted valve, the entrance of the bottom of accumulator AC and the 9th inserted valve C9 that hydraulic die cushion, which controls oil circuit, It is connected, the outlet of the 9th inserted valve C9 is connected with the entrance of the 8th inserted valve C8, outlet and each hydraulic die cushion of the 8th inserted valve C8 The main oil pipe of plunger case 2b is connected；8th inserted valve C8 is equipped with opening regulation handle, the hydraulic control mouth and the 7th of the 9th inserted valve C9 The A mouths of solenoid directional control valve YV7 are connected, and the 7th solenoid directional control valve YV7 is two four-way electromagnetic reversing valves, the 7th solenoid directional control valve The P mouths of YV7 are connected with the entrance of the 9th inserted valve C9, and the T mouths of the 7th solenoid directional control valve YV7 are connected with fuel tank.In hydraulic die cushion 2 Quickly when ejection, the 8th solenoid directional control valve YV8 and the 16th equal dead electricity of electromagnetic ball valve YV16, the 11st inserted valve C11 and 20th inserted valve C20 is closed；7th solenoid directional control valve YV7 obtains electric, the 9th inserted valve C9 openings, by adjusting the 8th inserted valve The opening regulation handle of C8 adjusts uninterrupted, and the pressure oil stored in accumulator AC inserts by the 9th inserted valve C9 and the 8th Valve C8 is filled to enter in four hydraulic die cushion plunger case 2b, realize using accumulator AC to the hydraulic die cushion plunger case 2b positioned at surrounding into The quick repairing of row.Hydraulic die cushion plunger case 2b is eliminated quick using accumulator AC quick repairings with pressure when being run because of ejection It falls when ejection turns to eject at a slow speed, break so that entire ejection movement realizes smooth transition.In conjunction with using servopump Control technology is, it can be achieved that the accurately control of pressure and torque, the effectively save energy.
Third inserted valve C3 is connected with the outlet of the first check valve D1 respectively with the entrance of the 5th inserted valve C5, third inserting The outlet of valve C3 is connected with the entrance of the first inserted valve C1, the second inserted valve C2 and the 4th inserted valve C4 respectively, the first inserted valve The outlet of C1 is connected with the cavity of resorption of hydraulic die cushion piston cylinder 2a, the outlet of the second inserted valve C2 and the entrance difference of the 7th inserted valve C7 It is connected with the hydraulic fluid port of hydraulic die cushion plunger case 2b；5th inserted valve C5's exports the entrance and hydraulic die cushion with the 6th inserted valve C6 respectively The epicoele of piston cylinder 2a is connected, the outlet of the 4th inserted valve C4, the 6th inserted valve C6 and the 7th inserted valve C7 respectively with fuel tank phase Even, the side of hydraulic die cushion 2 is equipped with hydraulic die cushion displacement sensor S1, and the is equipped between the outlet and fuel tank of the first inserted valve C1 One pressure regulator valve F1, is equipped with the second pressure regulator valve F2 between the outlet and fuel tank of the second inserted valve C2.
The hydraulic control mouth of first inserted valve C1 is connected with the A mouths of the first electromagnetic ball valve YV1, the first electromagnetic ball valve YV1 is two-bit triplet solenoid directional control valve, and the P mouths of the first electromagnetic ball valve YV1 are connected with the outlet of the first inserted valve C1, first The T mouths of electromagnetic ball valve YV1 are connected with fuel tank；The A mouth phases of the hydraulic control mouth of second inserted valve C2 and the second solenoid directional control valve YV2 Even, the second solenoid directional control valve YV2 is two four-way electromagnetic reversing valves, P mouths and the second inserted valve C2 of the second solenoid directional control valve YV2 Entrance be connected, the T mouths of the second solenoid directional control valve YV2 are connected with fuel tank；The hydraulic control mouth of third inserted valve C3 and the first shuttle valve SF1 Centre exit be connected, the right end entrance of the first shuttle valve SF1 is connected with the outlet of third inserted valve C3, a left side of the first shuttle valve SF1 End entrance is connected with the A of third solenoid directional control valve mouths, and third solenoid directional control valve is that the 3-position 4-way electromagnetism that Median Function is p-type changes To valve, the B mouths of third solenoid directional control valve are connected with the hydraulic control mouth of the 5th inserted valve C5；The P mouths and the 4th of third solenoid directional control valve The outlet of inserted valve C4 is connected, and the T mouths of third solenoid directional control valve are connected with the outlet of third check valve D3, third check valve D3's Entrance is connected with the entrance of the 5th inserted valve C5；The B mouths of third solenoid directional control valve are connected with the entrance of the second check valve D2, and second The outlet of check valve D2 is connected with the hydraulic control mouth of the 4th inserted valve C4, and the hydraulic control mouth of the 4th inserted valve C4 also passes through third pressure regulator valve F3 is connected with fuel tank；The A mouths of third solenoid directional control valve are also connected with the outlet of the 4th check valve D4, the entrance of the 4th check valve D4 It is connected with the hydraulic control mouth of the 6th inserted valve C6, the hydraulic control mouth of the 6th inserted valve C6 is also connected by the 4th pressure regulator valve F4 with fuel tank； The hydraulic control mouth of 7th inserted valve C7 is connected with the B mouths of the 5th solenoid directional control valve YV5, and the 5th solenoid directional control valve YV5 is two four-ways The T mouths of solenoid directional control valve, the 5th solenoid directional control valve YV5 are connected with the outlet of the 7th inserted valve C7, the hydraulic control of the 7th inserted valve C7 Mouth is connected by the 5th pressure regulator valve F5 with fuel tank.
Each prefill valve CF1 is configured with pressure difference transmitter respectively, and two pressure signal input ends of each pressure difference transmitter connect respectively It is connected on the both ends of corresponding prefill valve.Main oil pump export pipeline G2 respectively with the 13rd inserted valve C13, the 14th inserted valve C14 and The entrance of 15th inserted valve C15 is connected, and the outlet of the 13rd inserted valve C13 is connected with the entrance of the 12nd inserted valve C12, the The outlet of 12 inserted valve C12 is connected with the epicoele of sliding block plunger case 1b and sliding block master cylinder 1a；15th inserted valve C15's goes out Mouth enters with the 16th inserted valve C16, the 17th inserted valve C17, the 18th inserted valve C18 and the 19th inserted valve C19 respectively Mouth is connected, and the outlet of the 18th inserted valve C18 is connected with sliding block master cylinder cavity of resorption oil circuit G1, and the 14th inserted valve C14, the 16th are inserted The outlet of dress valve C16, the 17th inserted valve C17 and the 19th inserted valve C19 are connected with fuel tank respectively, the 14th inserted valve C14 Hydraulic control mouth and fuel tank between be equipped with the 8th pressure regulator valve F8, between the outlet and fuel tank of the 18th inserted valve C18 be equipped with the 11st Pressure regulator valve F11.
The hydraulic control mouth of 13rd inserted valve C13 is connected with the A mouths of the 9th solenoid directional control valve YV9, the 9th solenoid directional control valve YV9 P mouths be connected with the entrance of the 13rd inserted valve C13, the T mouths of the 9th solenoid directional control valve YV9 are connected with fuel tank；14th inserting The hydraulic control mouth of valve C14 is connected with the B mouths of the tenth solenoid directional control valve YV10；The hydraulic control mouth and the second shuttle valve of 15th inserted valve C15 The centre exit of SF2 is connected, and the left entry of the second shuttle valve SF2 is connected with the outlet of the 15th inserted valve C15, the second shuttle valve SF2 Right entry be connected with the A mouths of the 11st solenoid directional control valve YV11, the P mouths of the 11st solenoid directional control valve YV11 with the 15th inserting The entrance of valve C15 is connected；The hydraulic control mouth of 16th inserted valve C16 is connected with the A mouths of the 12nd solenoid directional control valve YV12, and the 12nd The P mouths of solenoid directional control valve YV12 are connected with the entrance of the 16th inserted valve C16；The hydraulic control mouth and the tenth of 17th inserted valve C17 The A mouths of three solenoid directional control valve YV13 are connected, the entrance phase of the P mouth and the 17th inserted valve C17 of the 13rd solenoid directional control valve YV13 Even；The hydraulic control mouth of 18th inserted valve C18 is connected with the A mouths of the 14th electromagnetic ball valve YV14, the 14th electromagnetic switch ball The P mouths of valve YV14 are connected with the outlet of the 18th inserted valve C18；The hydraulic control mouth of 18th inserted valve C18 is changed with the 15th electromagnetism It is connected to the A mouths of valve YV15, is connected with the P mouths of the 15th solenoid directional control valve YV15 by the 9th pressure regulator valve F9, is adjusted by the tenth Pressure valve F10 is connected with the B mouths of the 15th solenoid directional control valve YV15；Tenth solenoid directional control valve YV10, the 11st solenoid directional control valve The T mouths point of YV11, the 12nd solenoid directional control valve YV12, the 13rd solenoid directional control valve YV13 and the 14th electromagnetic ball valve YV14 It is not connected with fuel tank, the B mouths of the 15th solenoid directional control valve YV15 are connected with fuel tank；14th electromagnetic ball valve YV14 is two Three-way solenoid valve, the solenoid directional control valve of the ten, the 11,12,13 and 15 are two four-way electromagnetic reversing valves.
The epicoele of hydraulic die cushion piston cylinder 2a is connected with the outlet of the 5th check valve D5, the entrance and fuel tank of the 5th check valve D5 It is connected；The outlet of servopump B1 is connected with the entrance of the tenth inserted valve C10, the hydraulic control mouth and the 6th electromagnetism of the tenth inserted valve C10 The B mouths of reversal valve YV6 are connected, and the outlet of the tenth inserted valve C10 and the T mouths of the 6th solenoid directional control valve YV6 are connected with fuel tank, the Six solenoid directional control valve YV6 are two four-way electromagnetic reversing valves.When hydraulic die cushion downlink, the 5th check valve D5 is inhaled out, in fuel tank Fluid enter the epicoele of hydraulic die cushion piston cylinder 2a through the 5th check valve D5.When the 6th solenoid directional control valve YV6 dead electricity, the tenth inserts It fills valve C10 to open, the fluid of the outlets servopump B1 is recycled through the tenth inserted valve C10 oil return boxes；When hydraulic die cushion pushes up soon, the 6th electricity Magnetic reversal valve YV6 obtains electric, and the tenth inserted valve C10 is closed, and the outlet oil circuit of servopump B1 builds pressure, the hydraulic control of the tenth inserted valve C10 Mouth ensures the operational safety of servopump B1 by the 6th pressure regulator valve F6 controls.When hydraulic die cushion stretches, and each cylinder is forced to retract, the Six solenoid directional control valve YV6 return to power failure state, and the tenth inserted valve C10 is opened.
As shown in figure 4, the servo motor M1 and each solenoid directional control valve of servopump B1 are controlled by control system, control system Including PLC controller and servo controller SDR, it is connected on the pipeline between accumulator AC and the 11st outlets inserted valve C11 The hydraulic die cushion displacement signal input terminal of the signal output end access PLC controller of pressure switch H1, hydraulic die cushion displacement sensor S1 IN1.First prefill valve pressure difference signal of the prefill valve pressure difference signal output end access PLC controller of the first pressure difference transmitter KP1 Second prefill valve pressure of the prefill valve pressure difference signal output end access PLC controller of input terminal IN2, the second pressure difference transmitter KP2 The third of the prefill valve pressure difference signal output end access PLC controller of difference signal input terminal IN3, third pressure difference transmitter KP3 is filled Liquid valve pressure difference signal input terminal IN4.
The high-pressure closing normally open contact H1-1 of pressure switch H1 is connected on 000 end of high-voltage signal input terminal of PLC controller Between mouth and DC power cathode VDC-, the low pressure of pressure switch H1 disconnects normally closed interlock H1-2 and is connected on the low of PLC controller It presses between 001 port of signal input part and DC power cathode VDC-；The high-low pressure switching signal output end 002 of PLC controller Port is connected with the servopump switching signal input terminal MC of servo controller SDR.
The flow analog signals positive output end OUT1 and the flow analog signals of servo controller SDR of PLC controller are just defeated Enter to hold AI3 to be connected, the flow analog signals of the flow analog signals negative output terminal COM1 and servo controller SDR of PLC controller Negative input end FAC3 is connected；The pressure simulation of pressure simulation the signal positive output end OUT2 and servo controller SDR of PLC controller Signal positive input terminal AI2 is connected, the pressure of pressure simulation the signal negative output terminal COM2 and servo controller SDR of PLC controller Analog signal negative input end FAC2 is connected.
Servo enables button SB1 and is connected between the enabling signal input terminal DI3 of servo controller SDR and common end COM； Detect the servopump pressure signal input end of the pump intake pressure sensor P1 and servo controller SDR of servopump B1 output pressures AI1 is connected.
It presses servo and enables button SB1, servo controller SDR devotes oneself to work.When under sliding block is fast, sliding block master cylinder 1a rod cavities It is fuel-displaced that preacceleration inflation carried out to accumulator AC, sliding block turn it is slow it is lower after, continued from servopump B1 to accumulator AC pressurisings, until pressure is opened The high-pressure closing normally open contact H1-1 for closing H1 is closed, and the signal that accumulator AC is reached to high pressure is input to the height of PLC controller 000 port of signal input part, PLC controller is pressed to make the 8th solenoid directional control valve YV8 dead electricity, the 11st inserted valve C11 is closed, accurate The standby sliding block work that enters is into pressurization.
When hydraulic die cushion 2 quickly ejects, the pressure oil stored in accumulator AC quickly fills into four hydraulic die cushion plunger case 2b. When hydraulic die cushion pushes up slowly, when hydraulic die cushion displacement sensor S1 is detected, hydraulic die cushion 2 rises to setting position or accumulator AC has dropped To low pressure, the low pressure of pressure switch H1 disconnects normally closed interlock H1-2 and disconnects, and PLC controller makes the 7th solenoid directional control valve YV7 dead electricity, 9th inserted valve C9 is closed, and accumulator AC stops to four hydraulic die cushion plunger case 2b repairings；Second solenoid directional control valve YV2 obtains electric make Second inserted valve C2 is opened, and the pressure oil of servopump B1 outputs enters hydraulic die cushion piston cylinder 2a and four hydraulic die cushion plunger cases simultaneously 2b, hydraulic die cushion 2 switch to eject at a slow speed.Using servopump B1 combinations hydraulic die cushion displacement sensor S1 by closing also operation control It realizes accurately controlling for 2 ejection position of hydraulic die cushion, improves the one-pass molding rate of part.
Servopump B1 includes the low-lift pump and high-pressure pump driven by the same servo motor M1, when hydraulic die cushion pushes up and hydraulic pressure soon When pad pushes up slowly, servopump B1 low pressure operation signals are inputted servo by 002 port of high-low pressure switching signal output end of PLC controller The servopump switching signal input terminal MC of controller SDR makes servo motor M1 drive low pressure pump operation.
When each cylinder of hydraulic die cushion is retracted, 002 port of high-low pressure switching signal output end of PLC controller is by servopump B1 high The servopump switching signal input terminal MC for pressing run signal input servo controller SDR makes servo motor M1 driving high-pressure pump fortune Row.
When flow increase analog signal is sent to SERVO CONTROL by the flow analog signals positive output end OUT1 of PLC controller When the flow analog signals positive input terminal AI3 of device SDR, servo motor M1 control servopumps B1 increases flow output.When PLC is controlled Flow reduction analog signal is sent to the flow simulation of servo controller SDR by the flow analog signals negative output terminal COM1 of device When signal negative input end FAC3, servo motor M1 control servopumps B1 reduces flow output.
When pressure increase analog signal is sent to servo control by the pressure simulation signal positive output end OUT2 of PLC controller When the pressure simulation signal positive input terminal AI2 of device SDR processed, servo motor M1 control servopumps B1 improves oil pressure.When PLC is controlled Pressure reduction analog signal is sent to the pressure simulation of servo controller SDR by the pressure simulation signal negative output terminal COM2 of device When signal negative input end FAC2, servo motor M1 control servopumps B1 reduces oil pressure.
The alarm signal input terminal 104 of PLC controller is connected with the alarm signal output ends DO3 of servo controller SDR.When When servo controller SDR detects failure, to PLC controller alarm signal input terminal 104 to sending out alarm signal, and stop Work.
AC power accesses the power end of servo controller SDR by filter EM1, and braking resistor R is connected on SERVO CONTROL The ports X4 of device SDR, the ports X3 of the encoder PG access servo controllers SDR of servo motor, PLC controller use Omron CP1H-XA40DR-A types, servo controller SDR use the NAS 4E45/81X type servos of Guilin stars Science and Technology Co., Ltd. Controller.
The method that the present invention carries out hydraulic pressure processing using oil pressure machine hydraulic system, each working cycles of hydraulic press are wrapped successively Include following action：(1) under sliding block level-one is fast：9th solenoid directional control valve YV9 obtain it is electric so that the 13rd inserted valve C13 is opened, fluid is through the 13 inserted valve C13 and the 12nd inserted valve C12 fill into the epicoele and sliding block plunger case 1b of sliding block master cylinder 1a；12nd electromagnetism changes To valve YV12 obtain it is electric so that the 16th inserted valve C16 is opened, the 13rd solenoid directional control valve YV13, which is obtained, electric makes the 17th inserted valve C17 beat It opens, the 14th electromagnetic ball valve YV14, which is obtained, electric makes the 18th inserted valve C18 open；15th solenoid directional control valve YV15 obtains electric make 19th inserted valve C19 obtains the support of the 9th pressure regulator valve F9；16th electromagnetic ball valve YV16 obtain it is electric make the 20th inserting Valve C20 is opened, and the 8th solenoid directional control valve YV8 obtains electric, the 11st inserted valve C11 openings, the fuel-displaced process of sliding block master cylinder 1a rod cavities Sliding block master cylinder cavity of resorption oil circuit G1, the 20th inserted valve C20 and the 11st inserted valve C11 carry out preacceleration inflation to accumulator AC.
(2) under sliding block two level is fast：Remaining is remained unchanged, and the 12nd solenoid directional control valve YV12 dead electricity makes the 16th inserted valve C16 It closes, prepares to descend transition slowly to sliding block.
(3) under sliding block is slow：Remaining is remained unchanged, and the 16th electromagnetic ball valve YV16 dead electricity makes the 20th inserted valve C20 close It closes, sliding block master cylinder cavity of resorption oil circuit G1 terminates the preacceleration inflation of accumulator AC；Continued by the 11st inserted valve C11 by servopump B1 To accumulator AC pressurisings, after the completion of pressurising, the 8th solenoid directional control valve YV8 dead electricity, the 11st inserted valve C11 is closed, the 13rd electricity Magnetic reversal valve YV13 dead electricity makes the 17th inserted valve C17 close, and is prepared to enter into sliding block work into pressurization.
(4) sliding block work is into pressurization：The support force of sliding block master cylinder 1a cavity of resorptions passes through the 9th pressure regulator valve by the 19th inserted valve C19 F9 is controlled.
(5) pressure release after sliding block pressurize：9th solenoid directional control valve YV9 dead electricity makes the 13rd inserted valve C13 close, the 14th electricity Magnetic reversing globe valve YV14 dead electricity makes the 18th inserted valve C18 close, and the 15th solenoid directional control valve YV15 dead electricity makes the 19th inserting Valve C19 is closed, remaining each solenoid directional control valve is held in power failure state.
(6) sliding block backhaul：Tenth solenoid directional control valve YV10 obtain it is electric so that the 14th inserted valve C14 is closed, main oil pump export pipeline G2 builds pressure；11st solenoid directional control valve YV11 obtains electric, the 15th inserted valve C15 openings；The pressure oil of main oil pump export pipeline G2 By the 15th inserted valve C15 and push the cavity of resorption that the 18th inserted valve C18 enters sliding block master cylinder 1a open；Reverberation matrix method is adjusted by the tenth Pressure valve F10 controls；Prefill valve control oil pipe G3 builds pressure, each prefill valve CF1 is opened, the fluid and sliding block of sliding block master cylinder 1a epicoeles The fluid of plunger case 1b passes through prefill valve CF1 oil return boxes respectively.
(7) hydraulic die cushion pushes up soon：8th solenoid directional control valve YV8 and the 16th equal dead electricity of electromagnetic ball valve YV16, the 11st inserts It fills valve C11 and the 20th inserted valve C20 is closed；7th solenoid directional control valve YV7 obtains electric, the 9th inserted valve C9 openings, by adjusting The opening regulation handle of 8th inserted valve C8 adjusts uninterrupted, and the pressure oil stored in accumulator AC passes through the 9th inserted valve C9 and the 8th inserted valve C8 enters in four hydraulic die cushion plunger case 2b, realizes using accumulator AC to the hydraulic die cushion positioned at surrounding Plunger case 2b carries out quick repairing.
The first electromagnetic ball valve YV1 is obtained electric simultaneously, and the first inserted valve C1 is opened；The left electromagnetism of third solenoid directional control valve Iron YV4 obtains electric, third inserted valve C3 openings；The pressure oil of servopump B1 outputs inserts followed by third inserted valve C3 and first Valve C1 enters the cavity of resorption of hydraulic die cushion piston cylinder 2a, and the epicoele fluid of hydraulic die cushion piston cylinder 2a flows back to fuel tank through the 6th inserted valve C6.
(8) hydraulic die cushion pushes up slowly：After hydraulic die cushion displacement sensor S1, which detects hydraulic die cushion 2, rises to setting position, the 7th electricity Magnetic reversal valve YV7 dead electricity makes the 9th inserted valve C9 close, and accumulator AC stops to four hydraulic die cushion plunger case 2b repairings；Second electricity Magnetic reversal valve YV2 obtain it is electric so that the second inserted valve C2 is opened, the pressure oil of servopump B1 outputs enters hydraulic die cushion piston cylinder 2a simultaneously With four hydraulic die cushion plunger case 2b, hydraulic die cushion 2 switchs to eject at a slow speed, and hydraulic die cushion 2 can be realized using the servopump B1 of small displacement Ejection control.Hydraulic die cushion 2 can be realized by closing also operation control using servopump B1 combinations hydraulic die cushion displacement sensor S1 Ejection position accurately controls, and improves the one-pass molding rate of part.
(9) each cylinder of hydraulic die cushion is retracted：First electromagnetic ball valve YV1 and the second solenoid directional control valve YV2 are kept as electricity, make One inserted valve C1 and the second inserted valve C2 are stayed open；The right electromagnet YV3 of third solenoid directional control valve, which is obtained, electric makes third inserted valve C3 is closed；4th inserted valve C4 is opened because of hydraulic control mouth release, and the fluid of hydraulic die cushion piston cylinder 2a cavity of resorptions passes through the first inserted valve C1 and the 4th inserted valve C4 oil return boxes；Simultaneously the 5th solenoid directional control valve YV5 obtain it is electric so that the 7th inserted valve C7 is opened, hydraulic die cushion plunger Fluid in cylinder 2b passes through the second inserted valve C2, the 4th inserted valve C4 and the 7th inserted valve C7 oil return boxes.
(10) hydraulic die cushion stretches, and each cylinder is forced to retract：First electromagnetic ball valve YV1, the second solenoid directional control valve YV2 are kept Must be electric, so that the first inserted valve C1 and the second inserted valve C2 is stayed open；Right electromagnet YV3 dead electricity makes third solenoid directional control valve return to Middle position, the 4th inserted valve C4 are stayed open；5th solenoid directional control valve YV5 dead electricity makes the 7th inserted valve C7 close, hydraulic die cushion piston The fluid of cylinder 2a cavity of resorptions passes through the first inserted valve C1 and the 4th inserted valve C4 oil return boxes；Fluid in hydraulic die cushion plunger case 2b passes through The power of second inserted valve C2 and the 4th inserted valve C4 oil return boxes, stretching is controlled by the third pressure regulator valve F3 of the 4th inserted valve C4.
The foregoing is merely the preferable possible embodiments of the present invention, non-therefore the limitation present invention patent protection model It encloses.In addition to the implementation, the present invention can also have other embodiment.All skills formed using equivalent substitution or equivalent transformation Art scheme, is all fallen within the protection domain of application claims.Technical characteristic of the present invention without description can be by or using now There is technology realization, details are not described herein.

Claims (10)

1. a kind of hydraulic system of hydraulic press, including sliding block (1) and hydraulic die cushion (2), sliding block are connected to sliding block oil cylinder at the top of (1) Lower section, the sliding block oil cylinder includes centrally located sliding block plunger case (1b) and the sliding block master cylinder (1a) positioned at both sides, sliding block Master cylinder (1a) and sliding block plunger case (1b) are connected by prefill valve (CF1) with fuel tank respectively, the hydraulic control mouth point of each prefill valve (CF1) It is not connected with prefill valve control oil pipe (G3), the flange of each prefill valve (CF1) is fixed on accordingly by prefill valve trip bolt (9) On sliding block oil cylinder, the upper end of each prefill valve trip bolt (9) is located in flange counterbore, it is characterised in that：The filling liquid The top center of valve trip bolt is equipped with interior hexagonal counterbore, and hexagonal plug tenon is embedded in the interior hexagonal counterbore, and the hexagonal is inserted The center of tenon is equipped with plug tenon threaded hole, is screwed with cam screw rod in the plug tenon threaded hole, the cam screw rod is connected to cam The lower face center of device, the circumference of the cam gear are equipped with the cam groove axially extended；The prefill valve flange The flange counterbore periphery of upper surface is adsorbed with strong magnet ring seat, and the fixed disk of switch is adsorbed with above the strong magnet ring seat, described convex Wheel apparatus, strong magnet ring seat and the fixed disk of switch with the prefill valve trip bolt coaxial line；The outer circle of the fixed disk of switch Travel switch is fixed on week, the probe of the travel switch is in the cam groove.
2. the hydraulic system of hydraulic press according to claim 1, it is characterised in that：The fixed disk of the switch includes in being located at The inner disc of the heart and outer toroid positioned at periphery, the outer toroid are adsorbed on the top of the strong magnet ring seat, and the inner disc is crushed on The lower section of the cam gear is consolidated between the inner periphery of the outer toroid and the excircle of the inner disc by what is radially extended Price fixing elastic spokes are connected with each other.
3. the hydraulic system of hydraulic press according to claim 1, it is characterised in that：The center of the cam gear is equipped with handle Hand lever jack is plugged with handlebar stem in the handle bar jack, is connected with bulb at the top of the handlebar stem, under the handlebar stem Be arranged with the handle lever lock tooth radially stretched out on the circumference at end, the circumference of the handle bar jack be equipped with it is described The compatible handlebar stem vertical slot of handle lever lock tooth and handlebar stem locked groove；The plug tenon threaded hole passes through left-handed with the cam screw rod Screw thread is mutually screwed on.
4. the hydraulic system of hydraulic press according to claim 1, it is characterised in that：Each prefill valve (CF1) is configured with respectively Pressure difference transmitter, two pressure signal input ends of each pressure difference transmitter are connected to the both ends of corresponding prefill valve；Main oil pump goes out Mouthful pipeline (G2) respectively with the 13rd inserted valve (C13), the entrance of the 14th inserted valve (C14) and the 15th inserted valve (C15) It is connected, the outlet of the 13rd inserted valve (C13) is connected with the entrance of the 12nd inserted valve (C12), the 12nd inserted valve (C12) Outlet is connected with the epicoele of sliding block plunger case (1b) and sliding block master cylinder (1a)；The outlet of 15th inserted valve (C15) respectively with 16th inserted valve (C16), the 17th inserted valve (C17), the 18th inserted valve (C18) and the 19th inserted valve (C19) enter Mouthful it is connected, the outlet of the 18th inserted valve (C18) is connected with sliding block master cylinder cavity of resorption oil circuit (G1), the 14th inserted valve (C14), the The outlet of 16 inserted valves (C16), the 17th inserted valve (C17) and the 19th inserted valve (C19) is connected with fuel tank respectively；Tenth The hydraulic control mouth of three inserted valves (C13) is connected with the A mouths of the 9th solenoid directional control valve (YV9), the P mouths of the 9th solenoid directional control valve (YV9) It is connected with the entrance of the 13rd inserted valve (C13), the T mouths of the 9th solenoid directional control valve (YV9) are connected with fuel tank；14th inserted valve (C14) hydraulic control mouth is connected with the B mouths of the tenth solenoid directional control valve (YV10)；The hydraulic control mouth and second of 15th inserted valve (C15) The centre exit of shuttle valve (SF2) is connected, and the left entry of the second shuttle valve (SF2) is connected with the outlet of the 15th inserted valve (C15), the The right entry of two shuttle valves (SF2) is connected with the A mouths of the 11st solenoid directional control valve (YV11), the 11st solenoid directional control valve (YV11) P mouthfuls are connected with the entrance of the 15th inserted valve (C15)；The hydraulic control mouth and the 12nd solenoid directional control valve of 16th inserted valve (C16) (YV12) A mouths are connected, and the P mouths of the 12nd solenoid directional control valve (YV12) are connected with the entrance of the 16th inserted valve (C16)；Tenth The hydraulic control mouth of seven inserted valves (C17) is connected with the A mouths of the 13rd solenoid directional control valve (YV13), the 13rd solenoid directional control valve (YV13) P mouths be connected with the entrance of the 17th inserted valve (C17)；The hydraulic control mouth and the 14th electromagnetic switch of 18th inserted valve (C18) The A mouths of ball valve (YV14) are connected, the outlet phase of the P mouths and the 18th inserted valve (C18) of the 14th electromagnetic ball valve (YV14) Even；The hydraulic control mouth of 18th inserted valve (C18) is connected with the A mouths of the 15th solenoid directional control valve (YV15), passes through the 9th pressure regulator valve (F9) it is connected with the P mouths of the 15th solenoid directional control valve (YV15), passes through the tenth pressure regulator valve (F10) and the 15th solenoid directional control valve (YV15) B mouths are connected；Tenth solenoid directional control valve (YV10), the 11st solenoid directional control valve (YV11), the 12nd solenoid directional control valve (YV12), the T mouths of the 13rd solenoid directional control valve (YV13) and the 14th electromagnetic ball valve (YV14) are connected with fuel tank respectively, the The B mouths of 15 solenoid directional control valves (YV15) are connected with fuel tank；14th electromagnetic ball valve (YV14) is that two-bit triplet electromagnetism changes To valve, the solenoid directional control valve of the ten, the 11,12,13 and 15 is two four-way electromagnetic reversing valves.
5. the hydraulic system of hydraulic press according to claim 4, it is characterised in that：The epicoele of hydraulic die cushion piston cylinder (2a) with The outlet of 5th check valve (D5) is connected, and the entrance of the 5th check valve (D5) is connected with fuel tank；The outlet of servopump (B1) and the The entrance of ten inserted valves (C10) is connected, the hydraulic control mouth of the tenth inserted valve (C10) and the B mouth phases of the 6th solenoid directional control valve (YV6) Even, the outlet of the tenth inserted valve (C10) and the T mouths of the 6th solenoid directional control valve (YV6) are connected with fuel tank, the 6th solenoid directional control valve (YV6) it is two four-way electromagnetic reversing valves.
6. the hydraulic system of hydraulic press according to claim 4, it is characterised in that：The bottom centre of hydraulic die cushion (2) connects There are hydraulic die cushion piston cylinder (2a), the four corners of hydraulic die cushion (2) to be connected respectively with the top of hydraulic die cushion plunger case (2b), servopump (B1) entrance is connected with fuel tank, and the outlet of servopump (B1) is connected with the entrance of the first check valve (D1), the first check valve (D1) outlet controls oil circuit, the 11st entrance of inserted valve (C11) and entering for the 20th inserted valve (C20) with hydraulic die cushion respectively Mouth is connected, and the hydraulic control mouth of the 11st inserted valve (C11) is connected with the P mouths of the 8th solenoid directional control valve (YV8), the 8th solenoid directional control valve (YV8) A mouths are connected with the entrance of the 20th inserted valve (C20), the B mouth connected tanks of the 8th solenoid directional control valve (YV8), the 8th electricity Magnetic reversal valve (YV8) is two four-way electromagnetic reversing valves, and the outlet of the 11st inserted valve (C11) is connected with accumulator (AC)；The The outlet of 20 inserted valves (C20) is connected with sliding block master cylinder cavity of resorption oil circuit (G1), the hydraulic control mouth of the 20th inserted valve (C20) and The A mouths of 16 electromagnetic ball valves (YV16) are connected, P mouths and the 20th inserted valve of the 16th electromagnetic ball valve (YV16) (C20) outlet is connected, and the T mouths of the 16th electromagnetic ball valve (YV16) are connected with the entrance of the 20th inserted valve (C20), the 16 electromagnetic ball valves (YV16) are two-bit triplet solenoid directional control valve.
7. the hydraulic system of hydraulic press according to claim 6, it is characterised in that：Hydraulic die cushion control oil circuit includes the One to the 9th inserted valve, the bottom of accumulator (AC) are connected with the entrance of the 9th inserted valve (C9), and the 9th inserted valve (C9's) goes out Mouth is connected with the entrance of the 8th inserted valve (C8), the main oil pipe of the outlet of the 8th inserted valve (C8) and each hydraulic die cushion plunger case (2b) It is connected；8th inserted valve (C8) is equipped with opening regulation handle, the hydraulic control mouth and the 7th solenoid directional control valve of the 9th inserted valve (C9) (YV7) A mouths are connected, and the 7th solenoid directional control valve (YV7) is two four-way electromagnetic reversing valves, the P of the 7th solenoid directional control valve (YV7) Mouth is connected with the entrance of the 9th inserted valve (C9), and the T mouths of the 7th solenoid directional control valve (YV7) are connected with fuel tank.
8. the hydraulic system of hydraulic press according to claim 7, it is characterised in that：Third inserted valve (C3) and the 5th inserting The entrance of valve (C5) is connected with the outlet of the first check valve (D1) respectively, and the outlet of third inserted valve (C3) is inserted with first respectively The entrance of valve (C1), the second inserted valve (C2) and the 4th inserted valve (C4) is connected, the outlet of the first inserted valve (C1) and hydraulic die cushion The cavity of resorption of piston cylinder (2a) is connected, the entrance of the outlet of the second inserted valve (C2) and the 7th inserted valve (C7) respectively with hydraulic pressure pad post The hydraulic fluid port of plug cylinder (2b) is connected；The outlet of 5th inserted valve (C5) entrance and hydraulic die cushion piston with the 6th inserted valve (C6) respectively The epicoele of cylinder (2a) is connected, the outlet of the 4th inserted valve (C4), the 6th inserted valve (C6) and the 7th inserted valve (C7) respectively with oil Case is connected, and the side of hydraulic die cushion (2) is equipped with hydraulic die cushion displacement sensor (S1)；The hydraulic control mouth and first of first inserted valve (C1) The A mouths of electromagnetic ball valve (YV1) are connected, and the first electromagnetic ball valve (YV1) is two-bit triplet solenoid directional control valve, the first electromagnetism The P mouths of reversing globe valve (YV1) are connected with the outlet of the first inserted valve (C1), the T mouths and fuel tank of the first electromagnetic ball valve (YV1) It is connected；The hydraulic control mouth of second inserted valve (C2) is connected with the A mouths of the second solenoid directional control valve (YV2), the second solenoid directional control valve (YV2) P mouths for two four-way electromagnetic reversing valves, the second solenoid directional control valve (YV2) are connected with the entrance of the second inserted valve (C2), and second The T mouths of solenoid directional control valve (YV2) are connected with fuel tank；Go out in the middle part of the hydraulic control mouth of third inserted valve (C3) and the first shuttle valve (SF1) Mouth is connected, and the right end entrance of the first shuttle valve (SF1) is connected with the outlet of third inserted valve (C3), the left end of the first shuttle valve (SF1) Entrance is connected with the A of third solenoid directional control valve mouths, and third solenoid directional control valve is the 3-position 4-way electromagnetic switch that Median Function is p-type The B mouths of valve, third solenoid directional control valve are connected with the hydraulic control mouth of the 5th inserted valve (C5)；The P mouths and the 4th of third solenoid directional control valve The outlet of inserted valve (C4) is connected, and the T mouths of third solenoid directional control valve are connected with the outlet of third check valve (D3), third check valve (D3) entrance is connected with the entrance of the 5th inserted valve (C5)；The B mouths of third solenoid directional control valve and entering for the second check valve (D2) Mouth is connected, and the outlet of the second check valve (D2) is connected with the hydraulic control mouth of the 4th inserted valve (C4), the hydraulic control of the 4th inserted valve (C4) Mouth is also connected by third pressure regulator valve (F3) with fuel tank；Outlet of the A mouths of third solenoid directional control valve also with the 4th check valve (D4) It is connected, the entrance of the 4th check valve (D4) is connected with the hydraulic control mouth of the 6th inserted valve (C6), the hydraulic control mouth of the 6th inserted valve (C6) Also it is connected with fuel tank by the 4th pressure regulator valve (F4)；The B of the hydraulic control mouth and the 5th solenoid directional control valve (YV5) of 7th inserted valve (C7) Mouth is connected, and the 5th solenoid directional control valve (YV5) is two four-way electromagnetic reversing valves, the T mouths and the 7th of the 5th solenoid directional control valve (YV5) The outlet of inserted valve (C7) is connected.
9. the hydraulic system of hydraulic press according to claim 8, it is characterised in that：The servo motor (M1) of servopump (B1) It is controlled by control system with each solenoid directional control valve, the control system includes PLC controller and servo controller (SDR), is stored It can be connected with pressure switch (H1), hydraulic die cushion displacement sensing on pipeline between device (AC) and the outlet of the 11st inserted valve (C11) The hydraulic die cushion displacement signal input terminal (IN1) of the signal output end access PLC controller of device (S1)；Pressure difference transmitter (KP1, KP2, KP3) prefill valve pressure difference signal output end access PLC controller prefill valve pressure difference signal input terminal (IN2, IN3, IN4)；The high-pressure closing normally open contact (H1-1) of pressure switch (H1) is connected on the high-voltage signal input terminal (000 of PLC controller Port) and DC power cathode（VDC-）Between, the low pressure of pressure switch (H1) disconnects normally closed interlock (H1-2) and is connected on PLC controls Between the low-voltage signal input terminal (001 port) and DC power cathode (VDC-) of device processed；The high-low pressure of PLC controller switches Signal output end (002 port) is connected with the servopump switching signal input terminal (MC) of servo controller (SDR)；PLC controller Flow analog signals positive output end (OUT1) be connected with the flow analog signals positive input terminal (AI3) of servo controller (SDR), The flow analog signals negative input end of the flow analog signals negative output terminal (COM1) and servo controller (SDR) of PLC controller (FAC3) it is connected；The pressure simulation signal positive output end (OUT2) of PLC controller is believed with the pressure simulation of servo controller (SDR) Number positive input terminal (AI2) is connected, pressure simulation signal negative output terminal (COM2) and the servo controller (SDR) of PLC controller Pressure simulation signal negative input end (FAC2) is connected；Servo enables the startup letter that button (SB1) is connected to servo controller (SDR) Number between input terminal (DI3) and common end (COM)；Detect servopump (B1) output pressure pump intake pressure sensor (P1) with watch The servopump pressure signal input end (AI1) for taking controller (SDR) is connected.
10. a kind of method that oil pressure machine hydraulic system using described in claim 9 carries out hydraulic pressure processing, it is characterised in that：Oil Each working cycles of press include following action successively：(1) under sliding block level-one is fast：13rd inserted valve (C13) is opened, fluid Fill into the epicoele and sliding block plunger case (1b) of sliding block master cylinder (1a)；11st inserted valve (C11), the 16th inserted valve (C16), 17 inserted valves (C17), the 18th inserted valve (C18) and the 20th inserted valve (C20) are opened, and sliding block master cylinder (1a) rod cavity goes out Oil carries out preacceleration inflation to accumulator (AC)；(2) under sliding block two level is fast：12nd solenoid directional control valve (YV12) dead electricity makes the 16th to insert Valve (C16) is filled to close；(3) under sliding block is slow：20th inserted valve (C20) is closed, and the preacceleration inflation of accumulator (AC) terminates；By servo Pump (B1) continues to accumulator (AC) pressurising, and the 11st inserted valve (C11) and the 17th inserted valve (C17) close after the completion of pressurising It closes；(4) sliding block work is into pressurization：The support force of sliding block master cylinder (1a) cavity of resorption is controlled by the 9th pressure regulator valve (F9)；(5) after sliding block pressurize Pressure release：13rd inserted valve (C13), the 18th inserted valve (C18) and the 19th inserted valve (C19) are closed, remaining each electromagnetism changes It is held in power failure state to valve；(6) sliding block backhaul：14th inserted valve (C14) is closed, and the 15th inserted valve (C15) is opened, The pressure oil of main oil pump export pipeline (G2) enters the cavity of resorption of sliding block master cylinder (1a)；Reverberation matrix method is controlled by the tenth pressure regulator valve (F10) System；Each prefill valve (CF1) is opened, and the fluid of sliding block master cylinder (1a) epicoele and sliding block plunger case (1b) passes through prefill valve respectively (CF1) oil return box；(7) hydraulic die cushion pushes up soon：11st inserted valve (C11) and the 20th inserted valve (C20) are closed, the 9th inserted valve (C9) it opens, the inner pressure oil of accumulator (AC) quickly fills into four hydraulic die cushion plunger cases (2b)；First inserted valve simultaneously (C1), third inserted valve (C3) is opened, and the pressure oil of servopump (B1) output enters the cavity of resorption of hydraulic die cushion piston cylinder (2a), liquid The epicoele fluid of pressure pad piston cylinder (2a) flows back to fuel tank through the 6th inserted valve (C6)；(8) hydraulic die cushion pushes up slowly：When on hydraulic die cushion (2) After being raised to setting position, the 9th inserted valve (C9) is closed, and accumulator (AC) stops to four hydraulic die cushion plunger case (2b) repairings；The Two inserted valves (C2) are opened, and the pressure oil of servopump (B1) output enters hydraulic die cushion piston cylinder (2a) and four hydraulic pressure pad posts simultaneously Plug cylinder (2b)；(9) each cylinder of hydraulic die cushion is retracted：Third inserted valve (C3) is closed, and the 4th inserted valve (C4) and the 7th inserted valve (C7) are beaten It opens, the fluid oil return box in the fluid and hydraulic die cushion plunger case (2b) of hydraulic die cushion piston cylinder (2a) cavity of resorption；(10) hydraulic die cushion stretches, Each cylinder is forced to retract：Third solenoid directional control valve returns to middle position, and the 7th inserted valve (C7) is closed, hydraulic die cushion piston cylinder (2a) cavity of resorption and The power of fluid oil return box in hydraulic die cushion plunger case (2b), stretching is controlled by third pressure regulator valve (F3).
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CN109130297A (en) * 2018-09-28 2019-01-04 南通市腾达锻压机床厂 The servo-control system of automobile longitudinal girder multi-cylinder multicolumn hydraulic press
CN110154434A (en) * 2019-06-24 2019-08-23 江苏国力锻压机床有限公司 A kind of more tonnage hydraulics and its method for carrying out hydraulic processing
CN111572082A (en) * 2020-04-17 2020-08-25 江苏国力锻压机床有限公司 Hydraulic processing method for glass fiber reinforced plastic product
CN112460100A (en) * 2020-11-26 2021-03-09 燕山大学 Push-pull hydraulic cylinder, hydraulic system and working method of hydraulic system
CN114483712A (en) * 2022-02-04 2022-05-13 浙江大学 Hydraulic cylinder micro-internal leakage detection test bed and detection method thereof

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CN114483712A (en) * 2022-02-04 2022-05-13 浙江大学 Hydraulic cylinder micro-internal leakage detection test bed and detection method thereof

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