CN203879827U - Servo drive hydraulic system - Google Patents

Servo drive hydraulic system Download PDF

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Publication number
CN203879827U
CN203879827U CN201420275342.XU CN201420275342U CN203879827U CN 203879827 U CN203879827 U CN 203879827U CN 201420275342 U CN201420275342 U CN 201420275342U CN 203879827 U CN203879827 U CN 203879827U
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master cylinder
oil
valve
hydraulic
selector valve
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吴汀
吴跃进
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吴汀
吴跃进
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Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a servo drive hydraulic system. The servo drive hydraulic system comprises a master cylinder, an auxiliary cylinder located at the lower end of the master cylinder, a hydraulic source used for providing oil pressure for the master cylinder and the auxiliary cylinder and an external pipeline used for connecting all components. A quick plunger type cylinder is arranged at the upper end of the middle of the master cylinder, and an ejection cylinder is arranged at the lower end of the middle of the master cylinder; the hydraulic source comprises an oil tank, an oil filter connected with the oil tank, a fixed displacement oil pump connected with the oil filter and an alternating current servo motor used for driving the fixed displacement oil pump to provide oil pressure. One branch path of an oil outlet of the hydraulic source is connected with an upper cavity of the master cylinder through a first reversing valve, respectively connected with a lower cavity of the master cylinder and the quick plunger type cylinder through a second reversing valve, and respectively connected with an upper cavity and a lower cavity of the ejection cylinder through a third reversing valve; the other branch path of the oil outlet of the hydraulic source is connected with the auxiliary cylinder through a fourth reversing valve.

Description

A kind of servo drive hydraulic system
Technical field
The utility model relates to hydraulic system technical field, particularly a kind of hydraulic system of utilizing driven by servomotor.
Background technique
Hydraulic press is one of most widely used equipment in shaping operation, forging, punching press, section bar extruding, powder metallurgy, extensive use in the field such as plastics and rubber product forming, conventional hydraulic machine be take pumping plant conventionally as power source, offer each actuator of hydraulic press and control mechanism with highly pressurised liquid, by a series of valve bodies, controlling working liquid body flows to, pressure and flow make each executive component complete due action according to technological requirement to make oil hydraulic cylinder produce straight line motion to carry out work, therefore exist complex structure, energy consumption is large, heating value is large, noise is high, vibration is large, it is high that oil filters filter required precision, many drawbacks such as the pressure loss is large, after entering 2000, along with countries in the world are in energy consumption, noise, leak, the requirement of the aspect increasingly stringents such as working environment, one of the energy-conservation main direction of studying that has become electrohydraulic system and research emphasis, for example application publication number CN 102478029 A disclose a kind of hydraulic system, comprise left hydraulic jack parallel with one another and right hydraulic jack, described left hydraulic jack is connected with a hydraulic lock with after described right hydraulic jack parallel connection, described hydraulic lock is also connected with the second actuator port with the first actuator port of a 3-position 4-way solenoid directional control valve respectively, the 3rd actuator port of described 3-position 4-way solenoid directional control valve is connected with a throttle valve, described throttle valve is also connected with an oil hydraulic pump, described oil hydraulic pump is connected with a filter simultaneously, owing to adopting two oil cylinder synchronization control, and in conjunction with 3-position 4-way solenoid directional control valve, further improved the stability of whole hydraulic system, safe and reliable, although a lot of improvement have been done in this invention, but be still short of to some extent on energy consumption, can better not accomplish energy-conservation object.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art part, and a kind of servo drive hydraulic system is provided.
Above-mentioned technical purpose of the present utility model is achieved by the following technical programs: a kind of servo drive hydraulic system, comprise master cylinder, be positioned at the auxiliary cylinders of described master cylinder lower end, for the hydraulic power of described master cylinder and described auxiliary cylinders oil pressure is provided, exterior line for connecting components, the upper end position at described master cylinder middle part is provided with quick plunger case, the lower end position at middle part is provided with liftout tank, described hydraulic power comprises fuel tank, the oil purifier being connected with described fuel tank, the quantitative oil pump being connected with described oil purifier, for driving described quantitative oil pump that the AC servo motor of oil pressure is provided, branch road of described hydraulic power oil outlet is connected with described master cylinder epicoele by the first selector valve, by the second selector valve, be connected with described quick plunger case with described master cylinder cavity of resorption respectively, by the 3rd selector valve, be connected with cavity of resorption with the epicoele of described liftout tank respectively, the other branch road of described hydraulic power oil outlet is connected with described auxiliary cylinders by the 4th selector valve.
By driven by servomotor quantitative oil pump, because actuating motor can frequent starting, the characteristic of variable speed, realize servocontrol, thereby improve hydraulic press performance and reduce energy consumption, hydraulic press service behaviour is improved, realize volumetric speed control, cancel standby drain charge, greatly reduce energy consumption, pass through displacement transducer, accurately record the displacement that cylinder body moves, before master cylinder epicoele, be provided with pressure transducer and control the pressure of master cylinder epicoele, be provided with liquid-filling valve, during piston fast-descending, open liquid-filling valve simultaneously, large quantity of fluid enters master cylinder epicoele by liquid-filling valve, make master cylinder epicoele can be full of rapidly liquid, raise the efficiency.
As preferably, between described the first selector valve and described master cylinder upper oil cavitie, be also provided with for force fast the liquid-filling valve of its fast-descending to described master cylinder upper oil cavitie topping up, between described the second selector valve and described master cylinder cavity of resorption, be provided with one way sequence valve.
As preferably, between the right hydraulic fluid port of described the 4th selector valve and described auxiliary cylinders epicoele, be connected with the 5th selector valve, between described the 4th selector valve left side hydraulic fluid port and described auxiliary cylinders cavity of resorption, be connected with the first relief valve and the 3rd relief valve.
As preferably, between described liquid-filling valve and described master cylinder epicoele, be provided with pressure transducer.
As preferably, described hydraulic power oil outlet place is provided with the second relief valve, and described pressure valve rear end is provided with pressure gauge.
As preferably, described the second selector valve is three position four-way directional control valve.
As preferably, described master cylinder lower end is provided with the first displacement transducer for the described liftout tank of conflicting, and described auxiliary cylinders upper end is provided with second displacement sensor.
In sum, the utlity model has following beneficial effect:
Actuating motor can frequent starting, the characteristic of variable speed, realize servocontrol, thereby improve hydraulic press performance and reduce energy consumption, hydraulic press service behaviour is improved, realize volumetric speed control, cancel standby drain charge, greatly reduce energy consumption.
2. by displacement transducer, accurately record the displacement that cylinder body moves, avoid because excessive velocities causes two cylinder sharp impacts.
3. before master cylinder epicoele, be provided with pressure transducer and control the pressure of master cylinder epicoele, make master cylinder epicoele hydraulic pressure too high, and defective work piece.
4. between the first selector valve and described master cylinder upper oil cavitie, be also provided with for force fast the liquid-filling valve of its fast-descending to described master cylinder upper oil cavitie topping up, during piston fast-descending, open liquid-filling valve simultaneously, large quantity of fluid enters master cylinder epicoele by liquid-filling valve, make master cylinder epicoele to be full of rapidly liquid, raise the efficiency.
Accompanying drawing explanation
Fig. 1 is the present embodiment 1 schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment 1, as Fig. 1, a kind of servo drive hydraulic system, comprise master cylinder 1, be positioned at the auxiliary cylinders 2 of master cylinder 1 lower end, for the hydraulic power 3 of master cylinder 1 with auxiliary cylinders 2 oil pressure is provided, exterior line 4 for connecting components, the upper end position at master cylinder 1 middle part is provided with quick plunger case 11, the lower end position at middle part is provided with liftout tank 12, master cylinder 1 lower end is provided with the first displacement transducer 121 for the described liftout tank 12 of conflicting, auxiliary cylinders 2 upper ends are provided with second displacement sensor 21, hydraulic power 3 comprises fuel tank 31, the oil purifier 32 being connected with fuel tank 31, the quantitative oil pump 33 being connected with oil purifier 32, for driving quantitative oil pump 33 that the AC servo motor 34 of oil pressure is provided, branch road of hydraulic power 3 oil outlet is connected with master cylinder 1 epicoele by the first selector valve 41, by the second selector valve 42, be connected with quick plunger case 11 with master cylinder 1 cavity of resorption respectively, by the 3rd selector valve 43, be connected with cavity of resorption with the epicoele of liftout tank 12 respectively, the other branch road of hydraulic power 3 oil outlets is connected with auxiliary cylinders 2 by the 4th selector valve 44, hydraulic power 3 oil outlet places are provided with the second relief valve 410, pressure valve 410 rear ends are provided with pressure gauge, between the first selector valve 41 and master cylinder 1 upper oil cavitie, be also provided with for force fast the liquid-filling valve 45 of its fast-descending to master cylinder 1 upper oil cavitie topping up, between the second selector valve 42 and master cylinder 1 cavity of resorption, be provided with one way sequence valve 46, the second selector valve 42 is three position four-way directional control valve, between the right hydraulic fluid port of the 4th selector valve 44 and auxiliary cylinders 2 epicoeles, be connected with the 5th selector valve 47, between the 4th selector valve 44 left side hydraulic fluid ports and auxiliary cylinders 2 cavity of resorptions, be connected with the first relief valve 48 and the 3rd relief valve 411, between liquid-filling valve 45 and master cylinder 1 epicoele, be provided with pressure transducer 49.
Working principle:
(1) hydraulic power 3: quantitative oil pump 33 is driven by actuating motor 34, and for system provides needed high pressure oil, the second relief valve 410 is as hydraulic system safety valve.AC servo motor 34 speed and moment of torsion are controlled by computer, and quantitative oil pump 33 output flows are directly proportional to motor speed; Oil pressure is directly proportional to Motor torque.Fluid flow and pressure can regulate arbitrarily within the specific limits, realize in real time and controlling.
(2) master cylinder 1 mode of operation:
Master cylinder 1 is descending (idle stroke) fast: the right electromagnet of the second selector valve 42 obtains electric, the work of left position, oil enters quick plunger case 11 through the second selector valve 42, makes the piston fast-descending of master cylinder 1, liquid-filling valve 45 is opened simultaneously, and large quantity of fluid enters master cylinder 1 epicoele by liquid-filling valve 45; The liquid of master cylinder 1 cavity of resorption is got back to fuel tank through one way sequence valve 46 and the second selector valve 42, and computer detects slider displacement and speed by position the first displacement transducer 121, and pressure transducer 49 detects master cylinder upper cavity pressure.
Master cylinder approaches at a slow speed: when slide block drops to the position (patrix approaches workpiece) of regulation, computer sends signal, the first selector valve 41 switches, the work of right position, high pressure oil not only enters fast cylinder 11, and enters master cylinder 1 epicoele by valve 11, upper cavity pressure raises, liquid-filling valve 45 cuts out, and owing to entering fast cylinder liquid, reduces, and master cylinder rate of descent slows down.
Working stroke (on-load descending and pressurize) and pressurize: when patrix contacts workpiece, working stroke starts.Utilize pressure transducer 49 or and the first displacement transducer 121, can form pressure or speed (position) closed loop control system of the first displacement transducer 121---controller---actuating motor 34---quantitative oil pump 33---oil cylinder, controller can be controlled working stroke by various modes, and wherein two kinds of basic models are: the control based on press power and the control based on pressing speed.
Unloading: compacting end-of-job, the first displacement transducer 121 switches, and the drain charge spool of liquid-filling valve 45 is opened, and master cylinder 1 upper cavity pressure declines, and for slide block backhaul, prepares, the hydraulic shock while having avoided commutation.
Master cylinder backhaul: the second selector valve 42 switches, the work of right position, pressure oil enters master cylinder 1 cavity of resorption through the second selector valve 42, because hydraulic system need overcome piston rising resistance, hydraulic system still has certain pressure, and liquid-filling valve 45 is opened, and master cylinder 1 epicoele liquid is through liquid-filling valve 45 oil sump tanks.
Because 1 time cavity area of master cylinder is less, master cylinder 1 piston fast uplink (backhaul) is to original position.
(3) auxiliary cylinders 2 mode of operations:
Original position: the 4th selector valve 44 metas, auxiliary cylinders 2 cavity of resorption oil circuit sealings, auxiliary cylinders 2 piston original position transfixions.
Descending: the right position work of the 4th selector valve 44, the 5th selector valve 47 no electric circuits, the next work, pressure oil arrives auxiliary cylinders 2 epicoeles through the 4th selector valve 44, the 5th selector valve 47, cavity of resorption communicates with fuel tank 31 by the 4th selector valve 44, auxiliary cylinders 2 descent of pistons, descending stop position is detected by second displacement sensor 21, and controller is implemented to control.
Up: when the 4th selector valve 44 switches, the work of left position, pressure oil enters auxiliary cylinders 2 cavity of resorptions by the 4th selector valve 44, auxiliary cylinders 2 epicoele fluid are through the 5th selector valve 47, the 4th selector valve 44 oil sump tanks, auxiliary cylinders 2 piston stroking upwards (at a slow speed), now, when the 5th selector valve 47 obtains electric, switch to the next work, auxiliary cylinders 2 forms differential right wing, piston fast uplink.
Unsteady flanging: the 5th selector valve 47, the 4th selector valve 44 are all located normality, and auxiliary cylinders 2 epicoeles communicate with fuel tank 31 through the 5th selector valve 47, the 4th selector valve 44, cavity of resorption is through the logical fuel tank 31 of ratio the first relief valve 48.Flanging piston is descending under load (pressure-pad-force) effect, and controller passing ratio the first relief valve 48 is controlled the size of pressure-pad-force.The second relief valve 411 is as the safety valve of the flanging of floating.
(4) liftout tank 12 mode of operations:
Only there are two limit positions and two actions: eject and reset, by the 3rd selector valve 43, being controlled.
(5) combination and the process optimization of motion:
In the work of pull and stretch one class, auxiliary cylinders 2 can be synchronoused working with master cylinder 1, realizes " floating " flanging, generally, when master cylinder 1, auxiliary cylinders 2 are different with liftout tank 12, moves.
As a kind of high-performance hydraulic press, can be according to different technological requirements, the exercises of three oil cylinders can be appropriately combined, forms optimum mode of operation, reaches the optimization of manufacturing process.In the computer controlled system of hydraulic press, have parameterized basic process storehouse, comprise the kinds of processes such as pull and stretch, powder compaction, extruding, cold forging, when real work, call, and carry out parametrization running, each process parameter can be set temporarily and change.
This specific embodiment is only to explanation of the present utility model; it is not to restriction of the present utility model; those skilled in the art can make to the present embodiment the modification that there is no creative contribution as required after reading this specification, but as long as within the scope of claim of the present utility model, are all subject to the protection of Patent Law.

Claims (7)

1. a servo drive hydraulic system, it is characterized in that: comprise master cylinder (1), be positioned at the auxiliary cylinders (2) of described master cylinder (1) lower end, be used for providing the hydraulic power (3) of described master cylinder (1) with described auxiliary cylinders (2) oil pressure, exterior line (4) for connecting components, the upper end position at described master cylinder (1) middle part is provided with quick plunger case (11), the lower end position at middle part is provided with liftout tank (12), described hydraulic power (3) comprises fuel tank (31), the oil purifier (32) being connected with described fuel tank (31), the quantitative oil pump (33) being connected with described oil purifier (32), be used for driving described quantitative oil pump (33) that the AC servo motor (34) of oil pressure is provided, branch road of described hydraulic power (3) oil outlet is connected with described master cylinder (1) epicoele by the first selector valve (41), by the second selector valve (42), be connected with described quick plunger case (11) with described master cylinder (1) cavity of resorption respectively, by the 3rd selector valve (43), be connected with cavity of resorption with the epicoele of described liftout tank (12) respectively, the other branch road of described hydraulic power (3) oil outlet is connected with described auxiliary cylinders (2) by the 4th selector valve (44).
2. a kind of servo drive hydraulic system according to claim 1, it is characterized in that: between described the first selector valve (41) and described master cylinder (1) upper oil cavitie, be also provided with for force fast the liquid-filling valve (45) of its fast-descending to described master cylinder (1) upper oil cavitie topping up, between described the second selector valve (42) and described master cylinder (1) cavity of resorption, be provided with one way sequence valve (46).
3. a kind of servo drive hydraulic system according to claim 1, it is characterized in that: between the right hydraulic fluid port of described the 4th selector valve (44) and described auxiliary cylinders (2) epicoele, be connected with the 5th selector valve (47), between described the 4th selector valve (44) left side hydraulic fluid port and described auxiliary cylinders (2) cavity of resorption, be connected with the first relief valve (48) and the 3rd relief valve (411).
4. a kind of servo drive hydraulic system according to claim 2, is characterized in that: between described liquid-filling valve (45) and described master cylinder (1) epicoele, be provided with pressure transducer (49).
5. a kind of servo drive hydraulic system according to claim 1, is characterized in that: described hydraulic power (3) oil outlet place is provided with the second relief valve (410), and described pressure valve (410) rear end is provided with pressure gauge.
6. a kind of servo drive hydraulic system according to claim 4, is characterized in that: described the second selector valve (42) is three position four-way directional control valve.
7. a kind of servo drive hydraulic system according to claim 6, it is characterized in that: described master cylinder (1) lower end is provided with the first displacement transducer (121) for the described liftout tank (12) of conflicting, described auxiliary cylinders (2) upper end is provided with second displacement sensor (21).
CN201420275342.XU 2014-05-28 2014-05-28 Servo drive hydraulic system Active CN203879827U (en)

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Application Number Priority Date Filing Date Title
CN201420275342.XU CN203879827U (en) 2014-05-28 2014-05-28 Servo drive hydraulic system

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Application Number Priority Date Filing Date Title
CN201420275342.XU CN203879827U (en) 2014-05-28 2014-05-28 Servo drive hydraulic system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105485078A (en) * 2015-12-31 2016-04-13 长安大学 Energy recycling hydraulic system of rotary drilling rig mast derricking mechanism
CN106402060A (en) * 2016-10-17 2017-02-15 哈尔滨工业大学 Direct drive type volume control electrohydraulic servo hydraulic system for hydraulic press
CN107842530A (en) * 2017-11-27 2018-03-27 南通锻压设备股份有限公司 A kind of hydraulic system of high speed drift

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105485078A (en) * 2015-12-31 2016-04-13 长安大学 Energy recycling hydraulic system of rotary drilling rig mast derricking mechanism
CN106402060A (en) * 2016-10-17 2017-02-15 哈尔滨工业大学 Direct drive type volume control electrohydraulic servo hydraulic system for hydraulic press
CN106402060B (en) * 2016-10-17 2018-03-27 哈尔滨工业大学 Directly driven volume controlled electro-hydraulic servo hydraulic system of hydraulic machine
CN107842530A (en) * 2017-11-27 2018-03-27 南通锻压设备股份有限公司 A kind of hydraulic system of high speed drift
CN107842530B (en) * 2017-11-27 2019-05-31 南通锻压设备如皋有限公司 A kind of hydraulic system of high speed formed punch

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