CN1038991C - Quick depressurisation high power screw press - Google Patents

Abstract

The present invention relates to a fast depressurization high power screw press which belongs to high duty forging equipment. The [relates invention is composed of a bed body, a motor, a fly wheel, a screw bolt, a nut, a hydraulic balance cylinder, a press cylinder, a press piston, a clutch, a priority valve, a pressure sensor, an oil passage system, etc. The present invention solves the problems of slow depressurization, high friction work consumption (in the disengagement process of the clutch), overhigh final striking force, difficult limitation, etc. in the prior art. The present invention is good forging equipment for replacing a friction press (which is widely used at present) and a hot die forging press with high manufacture cost to be used for technologies such as finish forging, etc.

Description

A kind of high power screw press

The invention belongs to heavy forging equipment, a kind of friction press of present extensive use and hotdie forging press that involves great expense of replacing is used for the quick depressurisation high power screw press of forging.

Current, that be commercially available and high power screw press industrial application are the product of West Germany in the seventies development, and its patent No. is DE3346329.This forcing press is to drive with the flywheel that driven by motor is contained on the crossbeam.Being mounted on clutch in the flywheel during work in time throws off with screw rod and realizes stopping strike and slide block backhaul.The advantage of this forcing press is that the electric power to electrical network impacts shortcomings such as very big when having eliminated the A.C. contactor lost of life that electric screw press Fraquent start and rotating commutation causes and operation.It compresses clutch by hydraulic system and the hydro-cushion cylinder is realized the slide block backhaul, but need be equipped with huge Hydraulic Station unlike hydraulic screw press.These advantages make it become the most rising fly press.

The key problem in technology of high power screw press is that can clutch in time throw off rapidly after forcing press reaches specified tonnage, otherwise forcing press is seriously overloaded, and causes catastrophic effect.The high power screw press of West Germany's development is adorned an inertia disk in screw tip and is rotated with screw rod.Slipping of clutch after forcing press reaches specified tonnage, screw rod acutely slows down.Because effect of inertia, inertia disk is rotated in advance and is raise, and backs down pressure-relief valve gradually, makes the hold-down cylinder of clutch begin oil extraction release (its release time is five to tens milliseconds).In stress-relief process, clutch seriously skids and consumes a lot of frictional works, and is almost suitable with the forging work of deformation when die forging.After the slipping of clutch, because the drive of moment of friction on secondary part inertia and the clutch, screw rod also will continue to rotate a certain angle, so the load of forcing press also will continue to rise and will be considerably beyond specified tonnage.Its size is relevant with the moment of friction on the clutch, and coefficient of friction is subjected to many factor affecting, so final hitting power changes in bigger scope and is difficult for limiting, this life-span to lathe and mould all is harmful to.

It is slow to the objective of the invention is to solve the release that exists in the prior art; Clutch consumes problems such as a large amount of frictional works and the final excessive and difficult qualification of hitting power in disconnecting process.Propose a kind of novel, the quick depressurisation high power screw press of superior performance.

High power screw press is made up of the hydro-cushion cylinder of lathe bed, motor, flywheel, clutch, screw rod, nut, slide block, slide block, hold-down cylinder, clamping piston and the hydraulic system etc. of clutch.The present invention is placed on hold-down cylinder, clamping piston and clutch etc. under the crossbeam of lathe bed, utilizes technology power that clutch is compressed.Adopt the multi-disc wet clutch, it is non-slip to utilize self-lock mechanism to guarantee in strike and stress-relief process.Oil pressure in the hold-down cylinder increases with the increase of technology power, and when reaching certain setting, the pressure sensor action is by fast releases of realization such as pilot valves.

The present invention has following advantage compared with the prior art:

1, release speeds up five to ten times.

2, owing to utilize self-lock mechanism, clutch is also non-slip in stress-relief process, and the frictional work of consumption is almost nil, and has adopted static pressure thrust bearing, has reduced frictional resistance, therefore, and about total blow efficiency will double.

3, screw rod will continue rotation in the stress-relief process.Because sealing ring is opened, screw rod can move up, and therefore final hitting power can not continue to rise, thereby is effectively limited, and more stable, has prolonged the life-span of mould and stressed part.

4, in the strike process, clutch compresses voluntarily by technology power, so the comparable prior art of the oil pressure of hydraulic system reduces by 70%; Because final hitting power is effectively limited, main parts size such as lathe bed can design lightlyer.Therefore, can reduce complete machine cost about 20%.

Accompanying drawing is a structural representation of the present invention.

Be described in detail by reference to the accompanying drawings structure of the present invention:

As shown in the figure, hold-down cylinder of the present invention [6], clamping piston [3] and clutch [4] all be contained under the entablature of lathe bed, clutch [4] is the multi-sheet wet-type clutch. Main oil pocket [11] by sealing ring [7] sealing consists of static pressure thrust bearing. Sealing ring [7] The lower end is by spring [7-1] supporting, and the space of its lower end is secondary oil pocket [12], secondary oil pocket warp Cavity of resorption [8-3] UNICOM of hole [L2] and pilot valve [8]. Main oil pocket [11] is through the hole Annular chamber [8-2] UNICOM in the middle of [L1] and the pilot valve is again through damping slot [L3] With pilot valve epicoele [8-1] UNICOM, secondary oil pocket [12] is through damping slit [L4] and master Oil pocket [11] UNICOM, pilot valve epicoele [8-1] is by the check valve [8-on guide's spool 4] and the hole of core and cavity of resorption [8-3] UNICOM, pilot valve epicoele [8-1] fills a pressure and passes Sensor [9] and check valve [10]. Pressure sensor [9] is the work of the little garden of lower end band post Plug [9-1] and valve body composition, little garden styletable face have been blocked logical pilot valve epicoele [8-1] Aperture [d], piston cavity of resorption have a draining hole [s].

Embodiments of the invention are as follows:

The present invention is when halted state, and slide block rests on upper position by the active force of compensating cylinder.During startup, earlier by hydraulic oil supply system through check valve [10] to pilot valve [8] epicoele [8-1] oiling, because the spring of check valve [8-4] heads on steel ball, the oil of coming at first pushes pilot valve [8] and closes cone valve, pass through damping slot [L3] then to main oil pocket [11] oiling, simultaneously oil pressure raises and opens check valve [8-4], and oil to secondary oil pocket oiling, is adjacent to sealing ring [7] and clamping piston [3] through the hole of spool.At this moment also to main oil pocket fuel feeding, after the oil pressure of main oil pocket improved, clutch [4] was compressed the oil of secondary oil pocket gradually through the damping slit, made flywheel [1] and flywheel shaft [2] drive screw rod [5] rotation by clutch [4], promoted slide block and moved downwards.Owing to adopt the multi-disc wet clutch, under same axial force, the sheet number of friction plate guarantees that the moment of friction of clutch transmission is greater than the moment of resistance on the screw thread, with self-locking conditions satisfied.Before the strike,, stop to check valve [10] fuel feeding by travel switch control delivery valve.In the strike process, screw rod [5] rises, clutch [4] and clamping piston [3] are also and then risen, oil in the main oil pocket [11] is compressed, oil pressure improves, because secondary oil pocket [12] communicates with main oil pocket [11] by damping slit [L4], its pressure is close with main oil pocket [11] pressure, so sealing ring [7] tightly is close to clamping piston [3], has guaranteed the sealing of main oil pocket.Main oil pocket [11] communicates with the annular chamber [8-2] at pilot valve [8] middle part, communicate with pilot valve epicoele [8-1] through damping slot [L3] again, so pilot valve epicoele [8-1] is close with the pressure of main oil pocket [11], oil pressure tightly is pressed in guide's spool [8] on the conical valve seat like this.Secondary oil pocket [12] communicates with pilot valve [8] cavity of resorption [8-3], because pilot valve is closed in advance, whole system becomes a closed system; And form a high pressure lubricating pad at clamping piston [3] and hold-down cylinder [6] at the end, and becoming the static pressure thrust bearing between screw rod and the crossbeam, its pressure is directly proportional with technology power.

The upper end of piston [9-1] connects compressed air by compressed air interface [13], and its pressure is set up (0-60N/cm2) according to rated process power, and the upwards thrust that acts on piston [9-1] lower end is directly proportional with the pressure of main oil pocket.This piston is equivalent to the pressure sensor of main oil pocket, when technology power is in rated value, the hydraulic oil of main oil pocket [11] promotes the active force of piston [9-1] less than the compressed-air actuated pressure that acts on above the piston [9-1] by aperture [d], it is motionless that piston [9-1] is blocked aperture [d].When technology power overrate, s lifts piston [9-1] by aperture [d].At this moment, a large amount of hydraulic oils pour in piston [9-1] bottom, draining hole [s] has little time to drain, its pressure sharply raises, the thrust surge, it promotes piston [9-1] and moves upward fast, open hole [d] rapidly, and pilot valve [8] epicoele oil pocket oil pressure is sharply descended, so the chain reaction of avalanche type is taking place in a flash, produced following action: the hydraulic oil that acts on pilot valve middle part annular chamber [8-2] quickens pilot valve [8] upwards to promote, and the lower end cone valve is opened rapidly, and the oil of secondary oil pocket enters lower fuel tank by the cone valve mouth; Sealing ring [7] begins to leave clamping piston [3] and moves downward, the rapid oil extraction of main oil pocket, and meanwhile, screw rod promotes clamping piston [3] and moves up, and the oil extraction of main oil pocket [11] is further accelerated, the rapid release of main oil pocket, clutch is thrown off fast.Whole process can be finished in one millisecond.At this moment, slide block begins backhaul under the promotion of compensating cylinder, and under the promotion of nut, screw rod is forced to counter-rotating, and slide block returns upper position, and a working cycles is finished.

Midway to down stroke, quit work if desired, can stop to check valve [10] fuel feeding, and with the release of piston [9-1] epicoele compressed air, then the oil pressure of each oil pocket descends, and clutch [4] is unclamped, and realizes backhaul midway.

Claims (2)

1, a kind of high power screw press is made up of the hydro-cushion cylinder of lathe bed, motor, flywheel, clutch, screw rod, nut, slide block, slide block, hold-down cylinder, clamping piston and the hydraulic system of clutch, it is characterized by: hold-down cylinder [6], clamping piston [3] and clutch [4] all are contained under the entablature of lathe bed; Main oil pocket [11] by sealing ring [7] sealing constitutes static pressure thrust bearing; Sealing ring [7] lower end is by spring-loaded, the space of its lower end is secondary oil pocket [12], cavity of resorption [8-3] UNICOM of secondary oil pocket [12] [L2] and pilot valve [8] through the hole, main oil pocket [11] is [L1] and pilot valve intermediate annular chamber [8-2] UNICOM through the hole, again through damping slot [L3] and pilot valve epicoele [8-1] UNICOM, secondary oil pocket [12] is through damping slit [L4] and main oil pocket [11] UNICOM, pilot valve epicoele [8-1] is by the check valve [8-4] on guide's spool and the hole and cavity of resorption [8-3] UNICOM of core, pilot valve epicoele [8-1] is adorned a pressure sensor [9] and check valve [10], and the small column end face of the piston of pressure sensor [9-1] lower end is blocked the aperture [d] of pilot valve epicoele [8-1].

2,, it is characterized in that described clutch is the multi-disc wet clutch according to the described a kind of high power screw press of claim [1].

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