EP1308635B1 - Improvement in a copying distributor spool in hydraulic circuits for controlling hammer motion in punching machines - Google Patents

Improvement in a copying distributor spool in hydraulic circuits for controlling hammer motion in punching machines Download PDF

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Publication number
EP1308635B1
EP1308635B1 EP02024492A EP02024492A EP1308635B1 EP 1308635 B1 EP1308635 B1 EP 1308635B1 EP 02024492 A EP02024492 A EP 02024492A EP 02024492 A EP02024492 A EP 02024492A EP 1308635 B1 EP1308635 B1 EP 1308635B1
Authority
EP
European Patent Office
Prior art keywords
spool
hammer
hydraulic circuit
recess
distributor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02024492A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1308635A2 (en
EP1308635A3 (en
Inventor
Eugenio Lenzotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Euromac SpA
Original Assignee
Euromac SpA
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Filing date
Publication date
Application filed by Euromac SpA filed Critical Euromac SpA
Publication of EP1308635A2 publication Critical patent/EP1308635A2/en
Publication of EP1308635A3 publication Critical patent/EP1308635A3/en
Application granted granted Critical
Publication of EP1308635B1 publication Critical patent/EP1308635B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/10—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage

Definitions

  • the present invention regards improvements in a copying distributor spool in hydraulic circuits for controlling hammer movements in punching machines.
  • Fluid distributors e.g. oil distributors
  • oil distributors are known from long time and used in hydraulic circuits that control the movements of hammers, i.e. the cylinders loading the tools mounted each time in the tool heads of punching machines, such oil distributors being equipped with calibrated-stroke reciprocating drivers and designed to control parameters relating to the movements of the said hammers.
  • a distributor which is provided as a standard component in a hydraulic circuit driving a punching machine, and comprises a fixed body having multiple connections to the various sections of the hydraulic circuit and a slider or spool arranged to move axially in a respective seat by being urged by pressure variations of the fluid, and to control opening and closing of apertures that set the distributor in communication with the various sections of the hydraulic circuit.
  • each movement of the spool in one direction corresponds to a proportional movement in the opposite direction of the hammer inside its own receiving chamber, i. e. when the spool moves downwards the hammer moves upwards and vice-versa.
  • the useful stroke of the hammer is limited by the upper and lower dead points.
  • the lower dead point is determined by using a pre-settable measuring member comprising an index normally fixed to the hammer rod and a graduated reference or scale which is fixed to the structure of the punching machine and along which the said index slides together with the hammer rod.
  • the lower level the said index can reach is electronically monitored so that, when the same is reached and red on the graduated reference, the downwards stroke of the hammer is stopped.
  • the upper dead point is defined each time by the level of the abutment between the lower head of the distributor spool and the opposite upper head of a so-called plunger cylinder, which is also carried rigid with the hammer rod, with the interposition of a support suitable for locating it substantially coaxially below the said spool.
  • the piston of the said plunger cylinder is adjustable in position inside its own jacket or liner and setting thereof is effected by means of a valve provided in the hydraulic circuit, which is arranged either to feed or close or discharge the said jacket, whereby modifying the position of the piston and hence the abutment level between the piston and the distributor spool and thus the level of the upper dead point or start point of the active punching stroke, which depends upon the thickness of the metal sheet to be machined and is hence subject to numerous modifications during a working day.
  • the first drawback is due to the fact that the feed line of the plunger cylinder currently comprises a simple fluctuating hose which connects the oil feeding circuit to the cylinder jacket and is outside the control group, and thus bends to follow the movements of the control group.
  • a second disadvantage is due to the fact that the plunger cylinder is supported by the hammer rod by means of metal structural support, which is thus not calibrated in this application to the standards required by thousandth tolerances at which punching machines operate.
  • the hydraulic press has a quick movement and comprises a piston which is provided with an angular abutting portion which controls the approaching and returning stroke of the piston.
  • An automatic distributing valve is also provided for, and its positioning in both directions is controlled by means of disconnecting members which are placed at the ends of the upward stroke and at the end of the downward stroke of the piston; this disconnecting members comprise two respective fingers which are connected to the piston with connecting means, so that they can move together with the same and control a distributor member slindigly mounted inside the distributing valve.
  • the main object of the present invention is to eliminate the above-specified drawbacks faced with the state of the art solutions by providing improvements in copying distributor spool in hydraulic circuits designed to control the hammer motion in punching machines, which makes it possible to eliminate undesired resilient deformation phenomena of the plunger cylinder feed hoses and to ensure perfect axial alignment between the spool and the plunger cylinder piston, thus eliminating any potential source of working error.
  • a copying distributor spool for hydraulic circuits is arranged to control the motions of the hammer cylinder in punching machines, comprising a distributor body connected to the hydraulic circuits through pipe fittings and equipped with pressured fluid supply and discharge openings to which the said pipe fittings are connected, controlled by at least one valve unit mounted to the said circuits, inside which is mounted the spool in a mobile manner, for the purpose of opening and closing the said openings cyclically ,the active extremity of which communicates with the exterior of the said manifold body via a calibrated aperture, which is co-axially seated against a reference whose movement is integral with the movement of the hammer itself, characterised by the fact that at the said active extremity is machined an axial chamber of which one extremity is blind while the opposing extremity is open, inside which is mounted in a precisely mobile manner a pin driven by the flow of pressurised fluid controlled by the said valve unit, at least one
  • reference numeral 1 indicates a spool of a copying distributor 2 provided in a hydraulic circuit 3 for controlling the movements of the cylinder for a hammer 4 in punching machines.
  • the distributor 2 comprises a body 5 which is connected to the hydraulic circuit 3 by means of pipe fittings, not shown in the drawings, and equipped with feed lights or spaces 6 and discharge apertures 7 for a pressurised fluid, e. g. oil, to which the said pipe fittings are connected.
  • a pressurised fluid e. g. oil
  • the spool 1 is controlled by valve means, e.g. at least one pair of on-off valves 8 and 9 both connected to the hydraulic circuit 3, is also slidably mounted in a suitable seat 10 formed in the body 5, and is arranged cyclically to control opening and closing of lights or spaces 6, 7 and 33.
  • valve means e.g. at least one pair of on-off valves 8 and 9 both connected to the hydraulic circuit 3
  • a suitable seat 10 formed in the body 5
  • An active end 11 of the spool (1) communicates with the exterior of the body 5 via a suitable calibrated aperture 12 and is designed to engage by resting in a substantially co-axial way on an opposite locating or reference tip 13 which is integral with the hammer 4 and is thus moved with it.
  • an axial recess or chamber 14 is formed which has a blind end 15 and an open opposite end 16.
  • a pin 17 is slidably mounted in the axial chamber 14 and is displaceable therein by the pressurised oil flow controlled by the valves 8 and 9.
  • the said chamber 14 is in communication with at least one duct 18 which is formed in the body 5 and designed to supply pressurized oil thereto.
  • the opposite open end 16 of the said axial chamber 14 is fitted with sealing means to ensure sealing with the pin 17, e.g. at least one O-ring 19 of resilient material which is mounted in a respective hollow seat 20 formed in the inner side wall of the open end 16.
  • Duct (18) has its connection end 21 opening into the intermediate portion of the said axial chamber 14.
  • Reference tip 13 rigidly moving with hammer 4 includes at least one cross-member 22 having one end thereof rigid with the hammer rod of hammer 4 and which features, and its other end carrying at least one stud 23 extending perpendicular to the cross-member 22 and in coaxial alignement with the longitudinal axis "A" of pin 17.
  • micrometric setting means is provided between stud 23 and cross-member 22 to set the axial position of the stud 23 with respect to cross-member 22, and comprises a threaded portion of at least the foot 24 of the said stud 23, a respective threaded bore 25 formed in the other end of cross-member 22 for screw coupling with the said foot 24, and at least one safety locknut 26 arranged to prevent rotation of the stud 23 in the bore 25 after setting.
  • valves 8 and 9 the hydraulic circuit 3 also comprises a feed pump 24a, a pump delivery duct section 27, a branch 28 leading first to valve 8 and then to valve 9 and chamber 14, and a discharge or outlet 29.
  • a second branch 30 is leading to distributor 2 in which spool 1 is slidably mounted.
  • An electronic means 31 monitors the useful stoke of hammer 4 and the position of the lower dead point is settable in it, such a position in combination with the upper dead point, defining the absolute value of the said useful stroke.
  • hammer 4 of the punching machine effects its stroke between the upper and the lower dead points (see Figure 1 ) in order to punch the (or execute another operation on) metal sheets, the amplitude or length of the hammer stroke being previously defined.
  • the position of the upper dead point can be adjusted by moving it either downwards or upwards.
  • valve 8 is set in such a way as to supply pressurised oil coming from the delivery of pump 24 to valve 9.
  • Valve 9 is set in such a way as to deliver pressurized oil to the axial chamber 14 of the distributor 2 via duct 18 directly formed in the body 5 of the distributor 2 and opening into chamber 14 at outlet 21.
  • reaction spool (1) moves upwards thus setting into communication light 6 arranged to feed upper chamber (34), in which the cylinder of hammer 4 is slidingly arranged, with light 33 which is supplied with pressurised oil from the pump 24.
  • upper chamber 34 is pressurised and the hammer 4 moves downwards and takes with it the reference tip 13 which thus frees pin 17 that is caused to extend out of the axial chamber 14.
  • shutter 32 that controls the useful light for the oil flow (e.g. a gigleur) arranged in the feeding branch or section 28 of the hydraulic circuit 3.
  • oil flow e.g. a gigleur
  • valve 9 switches to shut off the oil delivery (see Figure 1 ) and valve 8 switches to deliver oil to chamber 34 in which the hammer 4 slides, thus resetting standard operation conditions of the punching machine.
  • valve 9 switches to its open position (see Figure 3 ) and valve 8 establishes communication between circuit section 28 and outlet 29, so that oil from axial chamber 14 of distributor 2 can be released.
  • the pressure reduction in the chamber 14 causes lowering of spool 1 inside the body 5 of the distributor 2. It should be noted, however, that, although this is not essential to the improvement of the present invention, one end of the said spool 1 is subjected to a constant hydraulic thrust, whereas on its other end a counterthrust due to pressurised oil from chamber (14) is applied, and thus when counterthrust is cut off spool 1 is urged it to move downwards.
  • On-off valves 8 and 9 are switched by a control press-button provided on a console 35 of the punching machine and manually operated when required.
  • the extent of the movements of the upper dead point is adjusted each time a control unit arranged to control the operation of the punching machine and to be accessed through controls provided on the said console 35.
  • the function of the spool 1 remains unaltered, i.e. it alternately opens and closes the various lights (6, 7, 33) provided in the body 5 of the distributor 2 by moving in it upon the various operations to be executed by the punching machine.
  • the invention as described above is suitable for achieving the objects set forth above, i.e. it makes it possible, on the one hand, to guide the pin 17 inside the axial chamber 14 throughout the entire length of the pin stroke to prevent transverse thrust component to arise, and, on the other, to supply the said axial chamber 14 via the duct 18 which is directly formed in the body 5 of the distributor 2 rather being a loose flexible hose as in prior art distributors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Servomotors (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP02024492A 2001-11-02 2002-10-30 Improvement in a copying distributor spool in hydraulic circuits for controlling hammer motion in punching machines Expired - Lifetime EP1308635B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO20010211 2001-11-02
IT2001MO000211A ITMO20010211A1 (it) 2001-11-02 2001-11-02 Perfezionamento allo spool del distributore di copiatura in circuitazioni idrauliche per il controllo degli spostamenti del maglio in macchi

Publications (3)

Publication Number Publication Date
EP1308635A2 EP1308635A2 (en) 2003-05-07
EP1308635A3 EP1308635A3 (en) 2006-04-19
EP1308635B1 true EP1308635B1 (en) 2008-05-07

Family

ID=11450897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02024492A Expired - Lifetime EP1308635B1 (en) 2001-11-02 2002-10-30 Improvement in a copying distributor spool in hydraulic circuits for controlling hammer motion in punching machines

Country Status (6)

Country Link
EP (1) EP1308635B1 (tr)
CN (1) CN1297753C (tr)
AT (1) ATE394600T1 (tr)
DE (1) DE60226395D1 (tr)
IT (1) ITMO20010211A1 (tr)
TR (1) TR200202470A2 (tr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2447642A (en) * 2007-03-15 2008-09-24 Tradewise Engineering Ltd Punching apparatus and method
CN102518609B (zh) * 2011-11-30 2015-09-16 南京埃尔法电液技术有限公司 高速冲床液压系统

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE444483A (tr) *
GB178006A (en) 1921-04-20 1922-04-13 Joseph Arthur Archer Improvements in or relating to mechanical stokers for furnaces
FR1511906A (fr) * 1967-02-17 1968-02-02 Dispositif de contrôle de la décompression du fluide de travail dans les machines hydrauliques telles que presses et machines équipées dudit dispositif
ES389152A1 (es) * 1971-03-02 1973-07-01 Junyent & Bofill S A Aparato posicionador de cilindros accionados mediante flui-do a presion.
US4355506A (en) * 1977-08-26 1982-10-26 Leonard Willie B Pump-motor power limiter and pressure relief
FR2425565A1 (fr) * 1978-05-09 1979-12-07 Renault Dispositif d'arret du piston d'un verin hydraulique
DE3129594C2 (de) * 1981-07-28 1985-01-17 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Servosteuerventil
CN1030150C (zh) * 1992-01-14 1995-10-25 周泰经 块式直连型电液随动系统
GB2360728B (en) * 2000-03-30 2004-08-18 Tradewise Engineering Ltd Fluid-operated circuit for setting the top and bottom dead center location of the punch actuation cylinder in punching machines
CN2439557Y (zh) * 2000-08-31 2001-07-18 武汉三联水电控制设备公司 集成式直连型机械液压装置

Also Published As

Publication number Publication date
CN1417000A (zh) 2003-05-14
TR200202470A2 (tr) 2003-06-23
CN1297753C (zh) 2007-01-31
ITMO20010211A0 (it) 2001-11-02
ATE394600T1 (de) 2008-05-15
EP1308635A2 (en) 2003-05-07
EP1308635A3 (en) 2006-04-19
ITMO20010211A1 (it) 2003-05-02
DE60226395D1 (de) 2008-06-19

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