CN85100434A - Power self-adapting non-pulse variable shifting reciprocal hydraulic press system - Google Patents

Abstract

The invention belongs to the hydraulic control system that reciprocating mechanism is used.

For obtaining pulsating movement free, power adaptive control, infinite variable speed to-and-fro motion hydraulic control system, adopted the reciprocating type variable reversible pump of the stepless change, pulsating movement free and the power adaptive that constitute by electricity-machine-liquid, make the piston of clutch release slave cylinder produce relative movement, and adopt synchronous control system at reversing point, guarantee being synchronized with the movement of pump, clutch release slave cylinder, thereby obtain the infinite variable speed to-and-fro motion of continuous pulsating movement free.

The present invention can be widely used in precision reciprocating machinery, also can be used for and need use as energy storage apparatus greater than 360 ° swinging-rotating motion mechanism simultaneously.

Description

Power self-adapting non-pulse variable shifting reciprocal hydraulic press system

The present invention belongs to the hydraulic system that reciprocating mechanism is used, and especially is adapted to the highi degree of accuracy reciprocating mechanism.

Common hydraulic system all adopts positive displacement variable break-in vane pump.Plunger pump, none does not utilize eccentric center principle and obtains the variation of volume, produces suction oil process, thereby finish mechanical energy is converted into the hydraulic pressure energy, and all inevitably the generation cycle changes its liquid stream.Cause flow and pressure pulsation.Pressure pulsation also becomes big with the effect of elastic element.The volume of displacement pump is all less in addition, obtain the hydraulic pressure energy by the confined area of little volume and the variation of non-confined area formation volume, thereby the linear velocity of fluid is very high, and liquid is subjected to very big agitation force effect, the eddy current of liquid, and cavitation is inevitable.Produce high pressure in the confined area, non-confined area liquid is in low pressure, because liquid has certain compression phenomena, make the liquid miscarriage in the system give birth to non-continuous event, these discontinuous liquid are through the pipe valve of system, the variation in cross section, hole and the reinforing function of elastic system, thereby cause the impact of liquid stream, noise and heating phenomenon solve the problem of flow and pressure pulsation, what adopt usually is blade (or plunger) number that increases pump, improves the revolution of pump.But because the revolution of the blade (or plunger) of pump number and pump can not increase unlimitedly.Therefore this way can not fundamentally solve pulsation problem, and solves vibration.Noise, heating problem will adopt expensive vibrationproof and noise countermeasure and additional cooling unit usually, and the power of general hydraulic system adapts to the control mechanism complexity, and control ratio is difficulty.

The object of the present invention is to provide a kind of pulsating movement free, the stepless speed regulation of break-in variable, power adaptive does not have during low speed and creeps, and noise is little during high speed, and oily temperature rise is little, and is simple in structure, and cost is low, the to-and-fro motion hydraulic system that reliability is high.

The said power self-adapting non-pulse variable shifting reciprocal hydraulic press system of the present invention, comprise that variable-speed spiral reciprocating plunger pump is (by in the accompanying drawing 15,16,17,18,25,26 form), the control of repairing synchronously is partly (by in the accompanying drawing 1,2,3,4,12,13,19,20,21,22,23,24 form), the buffering combination brake switch and proporting is partly (by in the accompanying drawing 9,10,11,14 form) and actuator (by in the accompanying drawing 5,6,7,8,29 form), connection between connection in the system between each part and each part as shown in drawings, also can be by the direct current of variable-speed (or interchange) motor 15 and speed reducer 16(without retarder) obtain the specified speed change of turning round and rotatablely move, by screw mandrel 17, nut piston 18, mechanical uniform motion in a straight line is passed to liquid, finish the process that mechanical energy is converted into the hydraulic pressure energy.Obtain the pressure oil of hydraulic pressure energy, by Pilot operated check valve 14, pass to the oil cylinder 28 under the worktable, relative movement by piston and oil cylinder with hydraulic pressure can be evenly, pulsating movement free, pass to worktable 5 rigidly, nut piston 18 in the pump 27 moves to the left or to the right, just can make worktable to-and-fro motion to the left or to the right.The transient vibration of hydraulic pressure in the system that when worktable commutates, produces.Can play buffer function by the buffering combination brake switch and proporting of native system, when worktable commutates,, the solenoid valve (12) in the accompanying drawing is opened by contactless switch (1,2) action, this moment, oil suction chamber did not have oil-feed, the inertia motion of worktable makes it that possibility that becomes vacuum be arranged, and back oil cavity pressure raises, and Pilot operated check valve 14 is closed, squeeze opening one-way valve 9 simultaneously and pass through throttle valve 10, promote guiding valve 11, inner valve stem overcomes spring pressure, makes valve 11 connect two.Because slide bar not only need overcome spring pressure, and because valve link need be extruded the interior hydraulic oil of valve pocket through throttling pore, and therefore motion is slowly carried out, high low pressure cavity pressure oil connection simultaneously, pressure balance.Worktable promptly stops inertia motion, because the synchronizing process of one section oil extraction is arranged before the pump piston commutation, the moment of commutation campaign after worktable stops of pump piston carried out, can avoid the pressure oil output of pump and high pressure oil that inertial force causes to collide like this, thereby can make reversing impact reduce to minimum.This hydraulic system is equipment which requires cooling not, and present variable displacement pump all has cooling unit, and install huge, the price height, its temperature rise generally is controlled at 25 ℃～30 ℃, and the present invention need not increase cooling unit, oily temperature rise will be very little.Because the rigidity height of system, the sealing of pump is easy, so the volumetric efficiency height.Screw mandrel, nut are paid in the encirclement of pressure oil, and the low-speed motion performance is good, therefore compare with general vane pump and more can obtain not have the low-speed motion of creeping.Because the fluid of native system stirs fewly, to flow steadily, temperature rise is low, so the life-span of hydraulic oil is long, replacement cycle is just long, owing to be enclosed, the cooling of need not changing oil again, therefore used hydraulic oil is few, if adopt the present invention, the stage of replacement can prolong one times than other system, needs oil mass also few at every turn.Because native system is simple in structure, it is all convenient to make, debug, keep in repair, part, figure paper low, and in light weight, volume is little, so the reliability height, and cost is low.Because native system adopts electric variable-speed, the system power self adaption, consumption hydraulic oil is few.Therefore comparable existing system is energy-conservation more than 1/2.The native system range of flow is big, and slewing range is wide.Therefore can satisfy multiple to-and-fro motion machinery, especially the needs of precision machine tool carriage motion.

Description of drawings: (1), (2), (21), (25) contactless switch, (3), (4), (26) contactless switch effect block, (5) worktable, (6) piston rod fulcrum, (7) operating cylinder piston, (8) piston cylinder, (9) one-way valve, (10) throttle valve, (11) guiding valve, (12) two-position three way magnetic valve, (13) one-way valve, (14) Pilot operated check valve, (15) but the direct current or the Wechselstrommotor of stepless speed regulation, (16) retarder, (17) screw mandrel, (18) band nut piston, (19) screw mandrel, (20) contactless effect nut slider, (22) actuating motor, (23) shifter, (24) screw mandrel (27) pump housing, (28) slide bar, (29) exhaust shutter.

The present invention can select different electrical equipment arrangements for speed regulation according to different Technological Economy requirements, different Synchronization Control automaticities, and pump installation also can adopt on demand also, connect and obtain different flow and pressure. The way of example that therefore multiple the best is arranged according to different needs.

Claims (4)

1, the hydraulic system used of a kind of reciprocating mechanism includes motor, and oil hydraulic pump and actuator is characterized in that hydraulic system is by adjustable bow curved roll speed motor.The reciprocating type variable reversible pump of spiral with power adaptive, the synchronous fluid infusion that is used to guarantee the reciprocating mechanism continuous action partly.Five parts of buffering combination brake switch and proporting and actuator that mechanism uses when commutating organically constitute.It connects as shown in drawings.

2, hydraulic system as claimed in claim 1, it is characterized in that the reciprocating type variable reversible pump of described spiral is by the pump housing (27) screw mandrel (17), the nut piston (18) that matches with screw mandrel is arranged at pump chamber, slide bar (28) for the nut piston guiding is arranged above pump housing axis heart line, make when the forward and reverse rotation of screw mandrel, nut piston is reciprocating in the pump housing, finishes mechanical energy and is converted into the hydraulic pressure energy.

3, hydraulic system as claimed in claim 1 is characterized in that described buffering combination brake switch and proporting is to be combined by the Pilot operated check valve (14) that is parallel to throttle valve (10) one-way valve (9) guiding valve (11) that flows back on the oil pipe line respectively and flow back on the oil circuit.When worktable (5) commutates, inertial force is played the equalizing and buffering effect.And the commutation repairing synchronization motion of protection oil pump.

4, hydraulic system as claimed in claim 1 is characterized in that described repairing synchronization control partly.Comprise by worktable two ends stroke dogs (3) (4) and two contactless switches (1) (2), two contactless switches (21) of hydraulic pressure and end face and control the servomotor (22) of its coordinate points, the contactless nut slider (20) of reflection piston displacement coordinate and the solenoid valve (12) and one-way valve (13) formation that are connected in parallel on pump housing two ends.Described system is synchronized with the movement, be when utilizing the worktable commutation, pump piston is finished from pressure chamber discharge certain amount of fluid by two-position two-way solenoid valve (12), when worktable is in the stroke end and motor (15) is in the process of commutation, finish the synchronous repairing control procedure of terminal point of pump piston and working piston.

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