CN106584914B - Pressure application devices - Google Patents

Pressure application devices Download PDF

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Publication number
CN106584914B
CN106584914B CN201611119630.6A CN201611119630A CN106584914B CN 106584914 B CN106584914 B CN 106584914B CN 201611119630 A CN201611119630 A CN 201611119630A CN 106584914 B CN106584914 B CN 106584914B
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CN
China
Prior art keywords
pressure
valve
hydraulic cylinder
application devices
oil
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CN201611119630.6A
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Chinese (zh)
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CN106584914A (en
Inventor
张英婵
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Taiyuan Heavy Machinery Group Engineering Technology Research And Development Co Ltd
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Taiyuan Heavy Machinery Group Engineering Technology Research And Development Co Ltd
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Priority to CN201611119630.6A priority Critical patent/CN106584914B/en
Publication of CN106584914A publication Critical patent/CN106584914A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16Control arrangements for fluid-driven presses
    • B30B15/161Control arrangements for fluid-driven presses controlling the ram speed and ram pressure, e.g. fast approach speed at low pressure, low pressing speed at high pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16Control arrangements for fluid-driven presses
    • B30B15/18Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • B30B15/20Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors

Abstract

The present invention discloses a kind of pressure application devices, including compresses hydraulic cylinder (1), high-order supply reservoir (2), hydraulic oil pump (3), prefill valve (4), proportioning valve (5) and check valve (6);Wherein: the oil transportation end of the hydraulic oil pump (3) passes through the entrance unilaterally connected of the check valve (6) and the proportioning valve (5);The outlet of the proportioning valve (5) is connected to by the first cut-off type direction valve (7) with the oil pocket for compressing hydraulic cylinder (1);The telescopic end for compressing hydraulic cylinder (1) is provided with pressure head (8) to apply pressure;The high position supply reservoir (2) is connected to by the prefill valve (4) with the oil pocket for compressing hydraulic cylinder (1).Above scheme can solve current pressure application devices and be filled with existing for high-voltage oil liquid the problem that regulation precision is lower, pressure regulation is inconvenient by hydraulic oil pump in high pressure impaction state.

Description

Pressure application devices
Technical field
The present invention relates to press device technical field more particularly to a kind of pressure application devices.
Background technique
In metallurgical technology field, pressure application devices are typically used in the occasion for needing to apply larger pressure, and pressure is applied The pressure head of oil (gas) filling device is driven by compressing hydraulic cylinder, compresses hydraulic cylinder extension energy drive ram to apply pressure.But in reality In the production process on border, compresses hydraulic cylinder and need to apply biggish pressure, cylinder diameter is larger, in order to realize compression hydraulic cylinder Quick-expansion, generally using top petrol tank by prefill valve quickly to compress the quick filling liquid of hydraulic cylinder, and then realize compress liquid Then the quick-expansion of cylinder pressure is filled with high-voltage oil liquid into compression hydraulic cylinder using hydraulic oil pump, and then realizes and compress hydraulic cylinder High pressure compress.
In the actual working process, hydraulic oil pump to compress hydraulic cylinder in be filled with high-voltage oil liquid there are regulation precision compared with It is low, the problem of pressure regulation inconvenience, and then it is easy to cause compression hydraulic cylinder works unstable, the final pressure effect for influencing pressure head.
High-voltage oil liquid is filled with by hydraulic oil pump in high pressure impaction state as it can be seen that how to solve current pressure application devices There is a problem of that regulation precision is lower, pressure regulation is inconvenient.
Summary of the invention
In view of this, the present invention discloses a kind of pressure application devices, to solve current pressure application devices in high pressure pressure Tight state is filled with existing for high-voltage oil liquid the problem that regulation precision is lower, pressure regulation is inconvenient by hydraulic oil pump.
In order to solve the above technical problems, the present invention is disclosed directly below technical solution:
Pressure application devices, including compress hydraulic cylinder, high-order supply reservoir, hydraulic oil pump, prefill valve, proportioning valve and unidirectional Valve;Wherein:
The oil transportation end of the hydraulic oil pump passes through the entrance unilaterally connected of the check valve and the proportioning valve;The ratio The outlet of valve is connected to or is ended by the realization of the first cut-off type direction valve with the oil pocket for compressing hydraulic cylinder;The compression is hydraulic The telescopic end of cylinder is provided with pressure head to apply pressure;
The high position supply reservoir is connected to by the prefill valve with the oil pocket for compressing hydraulic cylinder;
The oil return pipeline of the pressure application devices includes oil return fuel tank and the second cut-off type direction valve;Wherein: the pressure It is connected to or ends by the second cut-off type direction valve realization between the oil pocket and the oil return fuel tank of tight hydraulic cylinder.
Preferably, in above-mentioned pressure application devices, it is provided with relief line between the hydraulic oil pump and the check valve, The relief line includes overflow valve and overflow fuel tank;Wherein:
The input end of the overflow valve is connected between the hydraulic oil pump and the check valve, outlet end and the overflow Fuel tank connection.
Preferably, in above-mentioned pressure application devices, the overflow valve is electromagnetic relief valve.
It preferably, further include first pressure sensor, second pressure sensor and control mould in above-mentioned pressure application devices Block;Wherein:
The first pressure sensor is connected between the oil transportation end of the hydraulic oil pump and the check valve, for detecting First pressure;The second pressure sensor is connected between compression hydraulic cylinder and the outlet of the proportioning valve, for examining Second pressure is surveyed, the control module is connected with the first pressure sensor and the second pressure sensor, is used for root The proportionality coefficient of the proportioning valve is adjusted according to the first pressure and the second pressure.
It preferably, further include two movable press head hydraulic cylinders, two movable press head liquid in above-mentioned pressure application devices Cylinder pressure is separately positioned on the two sides for compressing hydraulic cylinder, the telescopic end of the movable press head hydraulic cylinder and the pressure head phase therewith Corresponding end connection.
Preferably, in above-mentioned pressure application devices, two movable press head hydraulic cylinders are symmetrically arranged at the compression The two sides of hydraulic cylinder.
Pressure application devices disclosed by the invention have the advantages that
In the process of work, high-order supply reservoir passes through prefill valve to compression liquid to pressure application devices disclosed by the invention It is quickly filled with hydraulic oil in the oil pocket of cylinder pressure, so that the telescopic end for compressing hydraulic cylinder quickly stretches out, so that pressure head is fast Speed is attached on stressed member, is then turned on hydraulic oil pump, and the electromagnet of the first cut-off type direction valve obtains electric, the first cut-off type direction Valve is in the state for being connected to its both ends oil circuit, and hydraulic oil pump drives high-voltage oil liquid successively to pass through check valve, proportioning valve and first section Only formula direction valve enters in the oil pocket for compressing hydraulic cylinder, so that the telescopic end band dynamic head high pressure for compressing hydraulic cylinder compresses forced section Part, after force is completed, the oil liquid compressed in the oil pocket of hydraulic cylinder realizes oil return by its oil return pipeline.It is disclosed by the invention Pressure application devices can be adjusted by the decompression of proportioning valve to be realized and compresses to the high pressure for compressing hydraulic cylinder, fine due to proportioning valve Adjusting can enable the compaction pressure for compressing hydraulic cylinder accurately to be adjusted, no pressure dead zone, and pressure regulation is also more convenient.It can See, pressure application devices disclosed by the invention can solve current pressure application devices and pass through hydraulic oil pump in high pressure impaction state The problem that regulation precision is lower, pressure regulation is inconvenient is filled with existing for high-voltage oil liquid.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in background technique, below will be to embodiment or back Attached drawing needed in scape technical description is briefly described, it should be apparent that, for those of ordinary skill in the art Speech, without any creative labor, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of pressure application devices provided in an embodiment of the present invention;
Fig. 2 is another structural schematic diagram of pressure application devices provided in an embodiment of the present invention.
Description of symbols:
1- compresses hydraulic cylinder, 2- high position supply reservoir, 3- hydraulic oil pump, 4- prefill valve, 5- proportioning valve, 6- check valve, 7- First cut-off type direction valve, 8- pressure head, 9- electromagnetic relief valve, 10- overflow fuel tank, 11- oil return fuel tank, the second cut-off type side 12- To valve, 13- first pressure sensor, 14- second pressure sensor, 15- movable press head hydraulic cylinder, 16- control module.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation Example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general Logical technical staff every other embodiment obtained without making creative work, all should belong to guarantor of the present invention The range of shield.
Referring to FIG. 1, the embodiment of the present invention discloses a kind of pressure application devices, disclosed pressure application devices include pressure Tight hydraulic cylinder 1, high-order supply reservoir 2, hydraulic oil pump 3, prefill valve 4, proportioning valve 5 and check valve 6.
Wherein, hydraulic oil pump 3 is high pressure oil conveying equipment, and the oil transportation end of hydraulic oil pump 3 passes through check valve 6 and proportioning valve 5 Entrance unilaterally connected, the oil liquid of the oil transportation end output of hydraulic oil pump 3 after check valve 6 can by the entrance of proportioning valve 5 into Enter in proportioning valve 5.
The outlet of proportioning valve 5 is connected to by the first cut-off type direction valve 7 with the oil pocket for compressing hydraulic cylinder 1, and hydraulic cylinder 1 is compressed Telescopic end be provided with pressure head 8 to apply pressure, in the process of work, the telescopic end for compressing hydraulic cylinder 1 pushes pressure head 8 to stretch out And then stressed member is compressed, the final application for realizing pressure.As shown in Figure 1, the first cut-off type direction valve 7 is electromagnetic type direction Valve, under the electromagnet Y2 energized state of the first cut-off type direction valve 7, the first cut-off type direction valve 7, which is in, is connected to its both ends oil circuit Connected state, under electromagnet Y2 off-position, the first cut-off type direction valve 7 be in block its both ends oil circuit connection.
High-order supply reservoir 2 is connected to by prefill valve 4 with the oil pocket for compressing hydraulic cylinder 1, to realize to compression hydraulic cylinder 1 Oil pocket in quickly it is oil-filled, and then realize compress hydraulic cylinder 1 telescopic end quickly stretch out, finally make pressure head 8 contact in stress On component.
In the process of work, high-order supply reservoir 2 passes through prefill valve 4 to pressure application devices disclosed by the embodiments of the present invention It is quickly filled with hydraulic oil into the oil pocket for compressing hydraulic cylinder 1, so that the telescopic end for compressing hydraulic cylinder 1 quickly stretches out, in turn So that pressure head 8 is quickly attached on stressed member, it is then turned on hydraulic oil pump 3, the electromagnet Y2 of the first cut-off type direction valve 7 is obtained Electricity, the first cut-off type direction valve 7 are in the state for being connected to its both ends oil circuit, and hydraulic oil pump 3 drives high-voltage oil liquid successively to pass through list Enter in the oil pocket for compressing hydraulic cylinder 1 to valve 6, proportioning valve 5 and the first cut-off type direction valve 7, so that compressing the flexible of hydraulic cylinder 1 End band 8 high pressure of dynamic head compresses stressed member, and after force is completed, the oil liquid compressed in the oil pocket of hydraulic cylinder 1 passes through its time Oil pipeline realizes oil return.Pressure application devices disclosed by the embodiments of the present invention can be adjusted by the decompression of proportioning valve 5 and be realized to pressure The high pressure of tight hydraulic cylinder 1 compresses, since fine-tuning for proportioning valve 5 can enable the compaction pressure for compressing hydraulic cylinder 1 to obtain Accurate adjusting, no pressure dead zone, pressure regulation are also more convenient.It is set as it can be seen that the embodiment of the present invention can solve current pressure application It is standby to be filled with that precision existing for high-voltage oil liquid is lower, pressure regulation is inconvenient asks into it by hydraulic oil pump in high pressure impaction state Topic.
Referring again to Fig. 1, relief line can also be set, relief line includes overflowing between hydraulic oil pump 3 and check valve 6 Stream valve and overflow fuel tank 10, the input end of overflow valve are connected between hydraulic oil pump 3 and check valve 6, outlet end and overflow fuel tank 10 connections.Specifically, overflow valve can be electromagnetic relief valve 9.In the specific course of work, it is driven after hydraulic oil pump 3 starts Dynamic oil liquid flows to check valve 6, and the electromagnet Y1 of electromagnetic relief valve 9 is powered, and the relief line that electromagnetic relief valve 9 is controlled is in Off-state.Certainly, after the completion of compressing hydraulic cylinder 1 and working, the electromagnet Y1 of electromagnetic relief valve 9 can be powered off, and then be opened Relief line, so that the oil liquid that hydraulic oil pump 3 drives is drained by relief line.
Pressure application devices disclosed in the present embodiment can also include oil return pipeline, and oil return pipeline may include oil return fuel tank 11 and the second cut-off type direction valve 12, the second cut-off type direction valve 12 be connected to the oil pocket and oil return fuel tank 11 for compressing hydraulic cylinder 1 Between, it compresses hydraulic cylinder 1 and is completed after pressure applies with dynamic head 8, the hydraulic oil compressed in 1 oil pocket of hydraulic cylinder can be by the Two cut-off type direction valves 12 flow back into oil return fuel tank 11, and under oil return state, the electromagnet Y4 of the second cut-off type direction valve 12 is disconnected Electricity, the connection of the second cut-off type direction valve 12 compresses the oil pocket and oil return fuel tank 11 of hydraulic cylinder 1, at this point, the first cut-off type direction valve 7 Electromagnet Y2 power-off, be in off state.Certainly, during pressure applies, the electromagnet of the first cut-off type direction valve 7 The electromagnet Y4 of Y2 power-off, the second cut-off type direction valve 12 is powered, so that the first cut-off type direction valve 7 and the second cut-off type Direction valve 12 is in off-state.Pressure application devices disclosed in the embodiment of the present application use 7 He of the first cut-off type direction valve The control of second cut-off type direction valve 12 compresses the release of hydraulic cylinder 1, have many advantages, such as it is simple, reliable, without impacting.Meanwhile it using There is no leakage problem, pressure maintaining effects during first cut-off type direction valve 7 and the implementation pressure maintaining of the second cut-off type direction valve 12 Fruit is preferable.The electromagnet Y4 of the electromagnet Y2 of first cut-off type direction valve 7 and the second cut-off type direction valve 12 is used cooperatively, can be more Effectively, the more easily operation such as the boosting compression of completion compression hydraulic cylinder 1, release release, pressure maintaining.
Please refer to attached drawing 2, pressure application devices disclosed by the embodiments of the present invention can also include first pressure sensor 13, Second pressure sensor 14 and control module 16.First pressure sensor 13 is connected to oil transportation end and the check valve 6 of hydraulic oil pump 3 Between, for detecting first pressure.Second pressure sensor 14, which is connected to, to be compressed between hydraulic cylinder 1 and the outlet of proportioning valve 5, is used In detection second pressure.Control module is connected with first pressure sensor 13 and second pressure sensor 14, for according to the One pressure and second pressure adjust the proportionality coefficient of proportioning valve 5.Pass through first pressure sensor 13 and second pressure sensor 14 Testing result adjust the proportionality coefficient of proportioning valve 5.Meanwhile the inspection of first pressure sensor 13 and second pressure sensor 14 Surveying result can be transmitted in main operation room with analog quantity, and the value of first pressure and second pressure is shown in main menu On, the proportionality coefficient of proportioning valve 5 is adjusted in main control room convenient for operator, reaches pressure controlled purpose.
Fig. 1 and 2 is please referred to, in order to realize the quickly filling liquid pressure oil into the inner cavity for compressing hydraulic cylinder 1, and then realizes and compresses The quick stretching of 1 telescopic end of hydraulic cylinder, it is preferred that pressure application devices disclosed in the present embodiment can also include that two pressure heads move Hydrodynamic cylinder pressure 15, two movable press head hydraulic cylinders 15 are separately positioned on the two sides for compressing hydraulic cylinder 1, movable press head hydraulic cylinder 15 Telescopic end is connect with the corresponding end of pressure head 8.During filling liquid, movable press head hydraulic cylinder 15 can drive ram 8 Quickly stretch out so that compress the telescopic end of hydraulic cylinder 1 without apply thrust and directly with pressure head 8 it is mobile, in such cases, Hydraulic oil can be able to achieve pressure head 8 and quickly stretch out quickly full of hydraulic cylinder 1 is compressed, while can improve to 1 oil of compression hydraulic cylinder The efficiency of intracavitary filling liquid.Compression hydraulic cylinder 1 is larger by the pressure that pressure head 8 applies, therefore compresses being relatively large in diameter for hydraulic cylinder 1, Above-mentioned two movable press head hydraulic cylinder 15 can improve the mobile stability of pressure head 8.Preferably, two movable press head hydraulic cylinders 15 are right It is arranged in the two sides for compressing hydraulic cylinder 1 with claiming, more can balancedly push the movement of pressure head 8, and play fast retractile pressure First 8 effect.
Herein, only emphasis describes the difference with other schemes to each preferred embodiment, as long as each preferred embodiment Do not conflict, can any combination, embodiment is formed by after combination also within scope disclosed in this specification, it is contemplated that Text is succinct, is individually described with regard to being no longer formed by embodiment to combination herein.
The above is only a specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest scope of cause.

Claims (6)

1. pressure application devices, which is characterized in that including compress hydraulic cylinder (1), high-order supply reservoir (2), hydraulic oil pump (3), Prefill valve (4), proportioning valve (5) and check valve (6);Wherein:
The oil transportation end of the hydraulic oil pump (3) passes through the entrance unilaterally connected of the check valve (6) and the proportioning valve (5);Institute The outlet for stating proportioning valve (5) is connected to or is cut by the realization of the first cut-off type direction valve (7) with the oil pocket for compressing hydraulic cylinder (1) Only;The telescopic end for compressing hydraulic cylinder (1) is provided with pressure head (8) to apply pressure;
The high position supply reservoir (2) is connected to by the prefill valve (4) with the oil pocket for compressing hydraulic cylinder (1);
The oil return pipeline of the pressure application devices includes oil return fuel tank (11) and the second cut-off type direction valve (12);Wherein: institute It states and company is realized by the second cut-off type direction valve (12) between the oil pocket and the oil return fuel tank (11) that compress hydraulic cylinder (1) Logical or cut-off.
2. pressure application devices according to claim 1, which is characterized in that the hydraulic oil pump (3) and the check valve (6) relief line is provided between, the relief line includes overflow valve and overflow fuel tank (10);Wherein:
The input end of the overflow valve is connected between the hydraulic oil pump (3) and the check valve (6), and outlet end is overflow with described Flow fuel tank (10) connection.
3. pressure application devices according to claim 2, which is characterized in that the overflow valve is electromagnetic relief valve (9).
4. pressure application devices according to claim 1, which is characterized in that further include first pressure sensor (13), Two pressure sensors (14) and control module;Wherein:
The first pressure sensor (13) is connected between the oil transportation end of the hydraulic oil pump (3) and the check valve (6), uses In detection first pressure;The second pressure sensor (14) is connected to compression hydraulic cylinder (1) and the proportioning valve (5) Between outlet, for detecting second pressure, the control module and the first pressure sensor (13) and the second pressure Sensor (14) is connected, for adjusting the ratio system of the proportioning valve (5) according to the first pressure and the second pressure Number.
5. pressure application devices according to any one of claims 1-4, which is characterized in that further include two movable press head liquid Cylinder pressure (15), two movable press head hydraulic cylinders (15) are separately positioned on the two sides for compressing hydraulic cylinder (1), the pressure head The telescopic end of mobile hydraulic cylinder (15) is connect with the pressure head (8) corresponding end.
6. pressure application devices according to claim 5, which is characterized in that two movable press head hydraulic cylinders (15) are right It is arranged in the two sides for compressing hydraulic cylinder (1) with claiming.
CN201611119630.6A 2016-12-08 2016-12-08 Pressure application devices Active CN106584914B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611119630.6A CN106584914B (en) 2016-12-08 2016-12-08 Pressure application devices

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Application Number Priority Date Filing Date Title
CN201611119630.6A CN106584914B (en) 2016-12-08 2016-12-08 Pressure application devices

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CN106584914A CN106584914A (en) 2017-04-26
CN106584914B true CN106584914B (en) 2019-03-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201645883U (en) * 2009-12-22 2010-11-24 武汉景宏工贸有限公司 Proportional supercharging control circuit used for hydraulic system of press
JP2011208790A (en) * 2010-03-30 2011-10-20 Toshiba Mach Co Ltd Control method of hydraulic pump and construction machine using the control method
CN202500840U (en) * 2012-03-27 2012-10-24 九江东升科技开发有限公司 Electrohydraulic actuating mechanism with servo proportioning valve
CN202811580U (en) * 2012-09-26 2013-03-20 珠海华粤离合器有限公司 Pressure servo controller of oil press
JP2013095531A (en) * 2011-10-28 2013-05-20 Toyota Industries Corp Lifting device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201645883U (en) * 2009-12-22 2010-11-24 武汉景宏工贸有限公司 Proportional supercharging control circuit used for hydraulic system of press
JP2011208790A (en) * 2010-03-30 2011-10-20 Toshiba Mach Co Ltd Control method of hydraulic pump and construction machine using the control method
JP2013095531A (en) * 2011-10-28 2013-05-20 Toyota Industries Corp Lifting device
CN202500840U (en) * 2012-03-27 2012-10-24 九江东升科技开发有限公司 Electrohydraulic actuating mechanism with servo proportioning valve
CN202811580U (en) * 2012-09-26 2013-03-20 珠海华粤离合器有限公司 Pressure servo controller of oil press

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