US2568262A - Hydraulic press circuit having intensifier utilized to decrease pressure and increase volume or vice versa - Google Patents

Hydraulic press circuit having intensifier utilized to decrease pressure and increase volume or vice versa Download PDF

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Publication number
US2568262A
US2568262A US630748A US63074845A US2568262A US 2568262 A US2568262 A US 2568262A US 630748 A US630748 A US 630748A US 63074845 A US63074845 A US 63074845A US 2568262 A US2568262 A US 2568262A
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United States
Prior art keywords
pressure
converter
fluid
conduit
ram
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Expired - Lifetime
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US630748A
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English (en)
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Warren R Tucker
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HPM Development Corp
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HPM Development Corp
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    • 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
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids

Definitions

  • This invention relates to fluid operable apparatus and particularly to fluid operable press operating circuits which include a pressure converter.
  • the primary object of this invention is to provide an operating circuit for a hydraulic press in which a plurality of operating speeds and working pressures may be obtained from a single fluid source in connection with a pressure converter.
  • Another object is to provide an operating circuit for a hydraulic press in which the ram may be advanced at high speed to engage the work, thereafter proceed at working speed into the work, thereafter advance still further into the work or dwell on the work at still higher pressures, and to accomplish this without the use of booster rams or surge valves.
  • Figure l is a diagrammatic view of a circuit utilizing a pressure converter as an intensifier
  • Figure 2 is a view similar to Figure 1 but showing the converter utilized as a pressure reducer;
  • Figure 3 is a vertical section through a typical converter and is indicated by a line 33 on Figure 4;
  • Figure 4 is a transverse vertical section through the converter and is indicated by the line l--l on Figure 3;
  • Figures 5, 6, 7 and 8 are transverse sections through the converter and are indicated respectively by the lines -5, 6-45, 'II, and lt on Figure 3;
  • Figure 9 is a diagrammatic view of a press circuit utilizing a pressure converter according to this invention.
  • Figure 10 is a view of a modified valve structure adapted for being used in connection with the circuit of Figure 9;
  • Figure 11 is a partial circuit illustrating automatic control means for shifting the valves; in the circuits of Figures 9 and 10;
  • Figure 12 is an electrical diagram for use in connection with the control circuit of Figure 11;
  • the discharge of fluid from a source is divided into increments of volume in the pressure and flow converter, the increments are modified in quantity through a connection with exhaust. and the modified increments are then discharged to a motor or similar hydraulic auxiliary.
  • the energy of the exhausted portion is utilized in compressing the remainder to a higher pressure so that the product of volume and pressure at the inlet of the converter is substantially equal to the production of volume and pressure at the outlet.
  • the fluid which is discharged from the converter is at a lower pressure and at a correspondingly greater volume.
  • FIG. l for purposes of explanation there is ditically illustrated the action of a single piston-cylinder unit, the pressure converter when it is utilized for intensitfying pressure and which, as hereinafter described, comprises a plurality of such units which are alternately controlled by a common valve means.
  • a pump Ill draws fluid from a reservoir l2 through a conduit ll and discharges fluid under pressure into a conduit l6.
  • Thev flow in the conduit i8 is divided by a valve member, not shown in Figs. 1 and 2, in the branch conduits l6 and I6" which communicate, respectively, with the chambers 18 and 20 of the single pistoncylinder unit generally indicated at 22.
  • This unit of the pressure converter comprises a cylinder 24 which has a central portion within which is reciprocable the piston 28 and the reduced diameter end portions within which are reciprocable the pistons 28 and 30.
  • the piston 2t reciprocates in the chamber it while the piston 30 reciprocates in the opposite end chamber indicated at 32.
  • the piston 26 divides the central portion of the cylinder 24 into the opposite end chambers 20 and 34.
  • the chamber 34 is connected by a conduit 38 with the reservoir it while the chamber 32 is connected by a conduit 38 with the inlet of a motor 40.
  • the other side of the motor All my be connected by a conduit 42 with the reservoir II for returning exhaust fluid thereto.
  • FIG 13 is a view of the motor of Figure 9 I
  • the pump is supplying fluid to both of the upper working areas of the pistons 28 and 28 while the lower workin areas are connected one with the motor inlet and the other with exhaust.
  • the pressure delivered to the motor 40 is augmented over the pressure delivered by the pump by the ratio of the said upper areas to the area which is connected to the motor inlet.
  • FIG. 2 is a similar diagrammatic illustration of a single cylinder-piston unit wherein the circuit is modified to utilize the unit 22' as a pressure reducing, and a flow augmenting device.
  • the discharge conduit it of the pump I is connected to the chamber l8, the chamber 20 is connected by a conduit. with the reservoir l2, the chamber 82 is connected by a conduit 88 with the inlet of the motor III and the chamber 84 is connected by a conduit 88 with the conduit l8.
  • the fiuid-pressure-volume converter or fluid intensifier 22 is more particularly shown in Figures 3 through 8 and is fully shown and described in my United States Patent Number 2,486,079, issued October 25, 1949, entitled Hydraulic Booster.”
  • the fluid-pressure-volume converter comprises a cylinder block III which has a plurality of axial bores 52 circumferentially spaced about a central bore ll.
  • the bores 52 provide cylinders within which reciprocate the pistons 58 havin the oppositely extending reduced piston portions 8 attached thereto.
  • the portions 58 reciprocate in bored cylindrical plugs I which are inserted from opposite ends of the block 58 into somewhat enlarged end ortions of the bores 52.
  • the piston 58 and the rods 58 deflne the upper working areas indicated at A and B and the lower working areas indicated at C and D.
  • the working areas are connected by radial passages with the central bore ll of the block "at different levels.
  • valve member indicated at 62 which is supported on the antifriction bearings Bl andwhich has an operating shaft 80 whereby the valve member may be rotated.
  • the block II has port 68 ( Figure 4) and.
  • the valve member 82 has a groove III at the level of the said port.
  • the groove I! is communicated with the levels of the connections to the areas A and B by a pair of oppositely disposed notches I2 which extend somewhat less than 90 about the periphery oi. the said valve member.
  • the levels of the connections to the areas 0 and D are com-.- municated with the groove III by a pair of oppositely disposed notches I4 which are similar to the notches I2 but which are disposed at 90 therefrom.
  • the valve member comprises the groove It at the upper end thereof and the groove I8 at the lower end thereof which communicate by a bore with port 82 in the block II.
  • the groove 16 communicates with the level of the connection with the area A by means of the oppositely disposed notches 84 which are disposed at from the notches I2 so that alternate communication may be had with the area A.
  • the groove I8 is similarly provided with the notches 8B which are disposed at 90 from the notches 84.
  • notches 88 are connected by radial bores with thecentral passage 80 in the valve member which communicates directly with an exhaust conduit 82.
  • notches 84 At the level of the connection with the area C are similarly arranged notches 84 which communicate with the central passage 80 and which are disposed at 90 from the notches 88.
  • valve member 62 is effective first to connect the port 68 to the areas 0 and D while connecting area B to the exhaust 82 and the area A to the port 82 and thereafter to reverse the said connections; that is to connect A and B to the port 68, C to exhaust and D to the port 82. It will also be apparent that by providing a plurality of cylinders and pistons, the same will operate to receive and to discharge fluid in overlapping increments so that substantially continuous operation may be had.
  • the converter 22 By connecting the pump to the port 68, the converter 22 acts as a pressure intensifier, and by connecting the pump the port 82, the converter acts as a pressure reducer. In either case, the efiiciency of conversion is high and the energy of the working fluid, represented by the production of pressure and volume, is substantially the same at the inlet and outlet ports of the converter,
  • FIG. 9 there is illustrated an upward acting ram Illll having an advancing means I02; a retracting means I and reciprocably mounted in a cylinder I08.
  • the advancing and retracting means are connected with the service ports of the four-way reversing valve I" which receives fluid from a conduit I I0 and which has an exhaust connection I I2.
  • the conduit H0 is connected with one of the ports of a four-way distributing valve Ill which also has connected therewith the conduits 11$, 8, and I20.
  • the conduit II! is connected with the discharge side of a pump I22 which draws fluid from a reservoir through a conduit I24.
  • the conduit I I8 connects with the port 68 of the converter 22 and the conduit I20 connects with the port 82.
  • the distributing valve Ill includes the valve member I28 movable to connect the conduits [It and H8 and the conduits III and III or, to connect the conduits H and I20, and the conduits H0 and H0.
  • the converter acts as a pressure reducer and delivers an augmented quantity of fluid to the conduit H0 and, in the second case the converter acts as a pressure intensifier and delivers a reduced volunie of fluid at intensified pressures to the conduit H0.
  • the electric motor I28 which is connected with the shaft 00 and which operates continuously to rotate the valve member for eflecting the aforementioned connections to the reciprocating pistons in the converter.
  • FIG 10 there is illustrated a valve which provides for a third pressure for actuating the motor by the passage I30 which is operable directly to connect the conduits H8 and H0 when the valve member is in a predetermined position.
  • a valve passage I30 which is operable directly to connect the conduits H8 and H0 when the valve member is in a predetermined position.
  • Control circuit of Figures 11 and 12 For obtaining an automatic cycle of operations of the work ram I00, there may be provided the circuit shown in Figure 11 which is controlled by the electrical circuit oi. Figure 12.
  • the conduit IIB from the pump is connected with the inlet port 200 of a valve 202 which has a rotatable valve member 204.
  • the valve member 204 rotates counterclockwise, communication is successively established between the pressure port 200 and the conduits I20, H0, and I I8.
  • the valve member 204 comprises the notches 205 and 200, the first or which connects the conduits H0 and H0 when the port 200 is in communication with the conduit I20, and the second of which connects the conduits H0 and I20 when the port 200 is in communication with the conduit H0.
  • the four-way valve I08 is continuously urged by a spring 2] 0 into position to connect conduit II 0 with the ram retracting means and is adapted for being moved into position to connect the conduit IIO with the ram advancing means by the energization of the solenoid SI.
  • a ratchet wheel 2I2 which has teeth that may be engaged by a pawl 2" when the latter is moved leftwardly by energization of a solenoid S2.
  • the ratchet wheel and, therefore, the valve member 204 are continuously urged clockwise by a torsion spring 2I8 and are retained in any of their operative positions by a latch bolt H0.
  • the latch bolt may be withdrawn at any time by the energization of a solenoid S3 so that the torsion spring 2l0 may return the valve member to its Figure 11 position.
  • the circuit of Figure 12 is provided.
  • the starting switch is bypassed by the normally open blades AI of the contactor A and the normally open limit switch LSI.
  • the blades AI provide a holding circuit for maintaining the contactor A energized, and the limit switch LSI is located to be closed by the ram I00, as shown in Figure 13, in its fully retracted position for giving a full automatic cycle when desired.
  • valve member 204 Also connected between LI and L2 is the solenoid SI in series with the normally open blades A2.
  • the energization 01' A will close the blades A2 and energize SI to shift the valve I00 to direct actuating fiuid to the ram advancing means.
  • the valve member 204 occupies its Figure 11 position and the ram I00 advances at a rapid rate and under low pressure.
  • the ram When the ram has advanced a predetermined amount, it may engage and temporarily close a limit switch LS2 which will energize S2 to aotuate the pawl 2I4 to advance the ratchet wheel 2 I2 and the valve member 204 to their next position.
  • This connects the pump directly with the ram advancing means and the speed of the ram is reduced and the operating pressure available is correspondingly increased.
  • a pressure switch connected with the advancing means and indicated at TI which is temporarily closed in response to a predetermined pressure acting on the ram for energizing the solenoid $2.
  • the solenoid S2 is energized again to index the valve member 204 to its third position by the temporary closure of a limit switch LS8. There may also be operated the pressure switch T2 which is temporarily closed in response to a higher pressure than the pressure which actuates TI for energizing S2.
  • the ram I00 now advances at a still lower speed with a still higher working pressure available.
  • a limit switch LS4 which is closed when the ram has advanced a predetermined amount and energizes a contactor coil .3.
  • the coil B may be energized by the closure of a pressure switch T8 connected with the ram advancing means. Energization of B closes the blades BI thereof and energizes the solenoid S3 to withdraw the latch bolt 2I0 from engagement with the ratchet wheel 2 I2 to permit the torsion spring 2l6 to return the valve mealher 204 to its Figure 11 position.
  • the blades 132 open, denergize A and thus deenergize sI to permit the spring 2I0 to move the valve I00 into position to connect the conduit "0 with a ram retracting means.
  • the ram is thus retracted at high speed to its Figure 9 position.
  • a hydraulic press may be constructed which has a rapid advancing speed, a first working speed and pressure, and a second working speed and pressure, all of which may be had with a simple ram oibooster rams, surge valves. permits the-ram to be made substantially smaller for any given working tonnage, and does so without sacriflcing ""e'fliciency or flexibility'oi the apparatus.
  • a differential fluid motor having oppositely disposed pressure areas; a reversing valve having a fluid inlet and 'an exhaust outlet and a pair oiservice ports connected respectively with the oppositely disposed pressure areas of said motor and operable selectively to direct fluid introduced within the fluid Tinlet to either of the pressure areas of said motor while connecting the oppositarea to exhaust; is fluid displacement pump; ailuid pressure-volume converter having flrst, second and exhaust ports and a rotary valve member; motor means .drivingly connected "with the 'valve member oi said converter ⁇ or rotating the latter, said converter being operable upon rotation 01' the valve --'member' and upon the introduction of pressure fluid into either the flrst or second port to discharge pressure fluid at a modifled pressure-voliime ratio from the opposite port; valve means having connections respectively with said pump,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
US630748A 1945-11-26 1945-11-26 Hydraulic press circuit having intensifier utilized to decrease pressure and increase volume or vice versa Expired - Lifetime US2568262A (en)

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Application Number Priority Date Filing Date Title
BE469931D BE469931A (ru) 1945-11-26
US630748A US2568262A (en) 1945-11-26 1945-11-26 Hydraulic press circuit having intensifier utilized to decrease pressure and increase volume or vice versa

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690205A (en) * 1950-07-10 1954-09-28 Walter E Stary Method and apparatus for expanding tubes
DE1024360B (de) * 1955-05-27 1958-02-13 Raymond Joseph Collion Hydraulischer Druckwandler
EP1172553A3 (de) * 2000-07-13 2003-12-03 Bosch Rexroth AG Hydrotransformator
WO2015025094A1 (fr) * 2013-08-20 2015-02-26 Vianney Rabhi Convertisseur de pression hydraulique reversible a vannes tubulaires
EP2971800A4 (en) * 2013-03-14 2016-11-23 Atomic Energy Of Canada Ltd Énergie Atomique Du Canada Limitée CONTROL DEVICE WITH A LOAD VALVE ASSEMBLY AND A FLOW VALVE ASSEMBLY
CN111120450A (zh) * 2018-10-31 2020-05-08 精工电子有限公司 推力放大装置、扩张单元、连结单元以及推力放大系统

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US406193A (en) * 1889-07-02 House
US556419A (en) * 1896-03-17 james
FR330855A (fr) * 1903-04-02 1903-08-26 De La Buire Perfectionnements aux presses hydrauliques à multiplicateur de pression à vapeur, à action directe
GB190524397A (en) * 1905-11-25 1906-11-22 James Leeming Improvements in Hydraulic Presses.
US1692771A (en) * 1924-11-08 1928-11-20 Oilgear Co Hydraulic press
US1927583A (en) * 1930-09-15 1933-09-19 Hydraulic Press Mfg Co Hydraulic motor control means
US2058377A (en) * 1931-05-07 1936-10-20 Chas E Francis Co Hydraulic press control
US2243978A (en) * 1938-08-27 1941-06-03 Integral Aux Y Equipment Ltd Rotary hydraulic intensifier
US2293076A (en) * 1939-01-05 1942-08-18 Bristol Aeroplane Co Ltd Apparatus for increasing or reducing fluid pressure
US2336446A (en) * 1941-10-06 1943-12-07 Hydraulic Dev Corp Inc Fluid pressure intensifier

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US406193A (en) * 1889-07-02 House
US556419A (en) * 1896-03-17 james
FR330855A (fr) * 1903-04-02 1903-08-26 De La Buire Perfectionnements aux presses hydrauliques à multiplicateur de pression à vapeur, à action directe
GB190524397A (en) * 1905-11-25 1906-11-22 James Leeming Improvements in Hydraulic Presses.
US1692771A (en) * 1924-11-08 1928-11-20 Oilgear Co Hydraulic press
US1927583A (en) * 1930-09-15 1933-09-19 Hydraulic Press Mfg Co Hydraulic motor control means
US2058377A (en) * 1931-05-07 1936-10-20 Chas E Francis Co Hydraulic press control
US2243978A (en) * 1938-08-27 1941-06-03 Integral Aux Y Equipment Ltd Rotary hydraulic intensifier
US2293076A (en) * 1939-01-05 1942-08-18 Bristol Aeroplane Co Ltd Apparatus for increasing or reducing fluid pressure
US2336446A (en) * 1941-10-06 1943-12-07 Hydraulic Dev Corp Inc Fluid pressure intensifier

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690205A (en) * 1950-07-10 1954-09-28 Walter E Stary Method and apparatus for expanding tubes
DE1024360B (de) * 1955-05-27 1958-02-13 Raymond Joseph Collion Hydraulischer Druckwandler
EP1172553A3 (de) * 2000-07-13 2003-12-03 Bosch Rexroth AG Hydrotransformator
EP2971800A4 (en) * 2013-03-14 2016-11-23 Atomic Energy Of Canada Ltd Énergie Atomique Du Canada Limitée CONTROL DEVICE WITH A LOAD VALVE ASSEMBLY AND A FLOW VALVE ASSEMBLY
US9976703B2 (en) 2013-03-14 2018-05-22 Atomic Energy Of Canada Limited/Énergy Atomique Du Canada Limitée Regulator apparatus having a charging valve assembly and a flow multiplier assembly
WO2015025094A1 (fr) * 2013-08-20 2015-02-26 Vianney Rabhi Convertisseur de pression hydraulique reversible a vannes tubulaires
FR3009849A1 (fr) * 2013-08-20 2015-02-27 Vianney Rabhi Convertisseur de pression hydraulique reversible a vannes tubulaires
CN105683586A (zh) * 2013-08-20 2016-06-15 V·拉比 具有管状阀的可逆式液压压力转换器
CN105683586B (zh) * 2013-08-20 2018-01-19 V·拉比 具有管状阀的可逆式液压压力转换器
AU2014310508B2 (en) * 2013-08-20 2018-03-29 Vianney Rabhi Reversible hydraulic pressure converter with tubular valves
CN111120450A (zh) * 2018-10-31 2020-05-08 精工电子有限公司 推力放大装置、扩张单元、连结单元以及推力放大系统

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