CN105545848B - Precise synchronous hydraulic control system for cylinders at two sides of high-pressure forming hydraulic press in pipe - Google Patents
Precise synchronous hydraulic control system for cylinders at two sides of high-pressure forming hydraulic press in pipe Download PDFInfo
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- CN105545848B CN105545848B CN201610012752.9A CN201610012752A CN105545848B CN 105545848 B CN105545848 B CN 105545848B CN 201610012752 A CN201610012752 A CN 201610012752A CN 105545848 B CN105545848 B CN 105545848B
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a precise synchronous hydraulic control system for cylinders at two sides of a high-pressure forming hydraulic press in a pipe, which comprises a proportional pressure flow composite valve, a first check valve, a first three-position four-way electromagnetic reversing valve, a one-way throttle valve, a pressure reducing valve, a first two-position electromagnetic reversing valve, a second check valve, a third check valve, a first overflow valve, a second hydraulic control one-way valve, a second three-position four-way electromagnetic reversing valve, a third three-position four-way electromagnetic reversing valve, a second two-position electromagnetic reversing valve, a synchronous cylinder, a right side cylinder, a left side cylinder, an electric motor, a one-way quantitative oil pump and an oil tank, wherein the synchronous cylinder is provided with two rod cavities and a rodless cavity, the left side cylinder and the right side cylinder are respectively provided with a first pressure sensor and a second pressure sensor, and the hydraulic control one-way valve is characterized in that the working principle is as follows that a, the left side cylinder and the right side cylinder are synchronously propelled; b. the left cylinder and the right cylinder synchronously retreat; c. the left cylinder is independently pushed in; d. the left cylinder is independently retracted; e. the right cylinder is independently pushed in, and the f and the right cylinder are independently retreated.
Description
Technical Field
The invention relates to a hydraulic control system, in particular to a precise synchronous hydraulic control system for cylinders at two sides of a high-pressure forming hydraulic press in a pipe.
Background
The high-pressure forming process in the pipe is one of thirteen international special advanced forming processes; the method has the characteristics of energy conservation, environmental protection, high efficiency, wide application and the like; the method is suitable for forming the special-shaped variable-section pipe fitting, the multi-way pipe, the variable-axis pipe fitting and other complex pipe fittings in the industries of aerospace industry, marine equipment industry, automobile industry, household appliance industry and the like. The basic process flow of the high-pressure forming in the pipe is as follows: the lower die is fixed on an inner high-pressure forming hydraulic press workbench, the upper die is fixed on a main cylinder, after a pipe blank is put into the lower die, a movable beam plate descends to drive the die to be closed, then a left cylinder and a right cylinder push and spray water-based emulsion, air in a blank pipe is exhausted and the die is sealed, then the system injects ultrahigh-pressure water-based emulsion into the blank pipe, meanwhile, the left cylinder and the right cylinder continuously push and squeeze piping supplementary materials, and finally, the part is formed into the same shape as the inside of the die. After maintaining the pressure for a period of time, opening the die, releasing pressure, retracting the left and right cylinders and the main cylinder, and taking out the finished product.
In the process flow, synchronous pushing of the cylinders at the left side and the right side is important, and the synchronous precision directly determines the forming quality of the product. At present, manufacturers of high-voltage equipment at home and abroad mostly adopt a precise servo control system to ensure the synchronous precision of two side cylinders, and the method has the advantages of high precision, quick dynamic response, complex system and high manufacturing cost. For parts with low precision requirements, a synchronous propulsion system which is simple and feasible, low in manufacturing cost and simple to operate and can meet the performance requirements is necessary.
Disclosure of Invention
The invention discloses a precise synchronous hydraulic control system for cylinders at two sides of a high-pressure forming hydraulic press in a pipe, which is used for solving the defects in the prior art.
In order to solve the problems, the technical solution of the invention is as follows:
a precise synchronous hydraulic control system for cylinders at two sides of a high-pressure forming hydraulic press in a pipe comprises a proportional pressure flow composite valve, a first check valve, a first three-position four-way electromagnetic directional valve, a one-way throttle valve, a pressure reducing valve, a first two-position electromagnetic directional valve, a second check valve, a third check valve, a first overflow valve, a second overflow valve, a first hydraulic control one-way valve, a second three-position four-way electromagnetic directional valve, a third three-position four-way electromagnetic directional valve, a second two-position electromagnetic directional valve, a synchronous cylinder, a right cylinder, a left cylinder, a motor, a one-way quantitative oil pump and an oil tank, wherein the synchronous cylinder is provided with two rod cavities and a rodless cavity, the left cylinder and the right cylinder are respectively provided with a first pressure sensor and a second pressure sensor on oil paths of the left cylinder and the right cylinder,
the working principle is as follows:
a. the left side cylinder and the right side cylinder are synchronously propelled: the electromagnet of the proportional pressure flow composite valve and the electromagnet of the three-position four-way electromagnetic reversing valve I are powered on, the motor is powered on, a coaxial unidirectional quantitative oil pump starts to absorb oil, hydraulic oil in an oil tank enters the proportional pressure flow composite valve and then flows into the rodless cavity of the synchronous cylinder after passing through the unidirectional throttle valve I, the synchronous cylinder piston is pushed to move towards the direction of the rod cavity, equal volume high pressure oil in the two rod cavities is discharged, and the two paths of high pressure oil enter the rodless cavities of the left cylinder and the right cylinder through the hydraulic control one-way valve I and the hydraulic control one-way valve II respectively, so that piston rods of the left cylinder and the right cylinder are pushed to do synchronous linear motion, and load acting is pushed;
b. the left cylinder and the right cylinder are retracted synchronously: the hydraulic oil flows through the proportional pressure flow composite valve, the first three-position four-way electromagnetic reversing valve and the second two-position electromagnetic reversing valve, enters the first three-position four-way electromagnetic reversing valve, then enters rod cavities of the left cylinder and the right cylinder, pushes the two cylinders to move towards the rodless cavity, and simultaneously, the hydraulic oil flows through the second two-position four-way electromagnetic reversing valve, controls an oil way to open the first hydraulic control one-way valve and the second hydraulic control one-way valve, so that the hydraulic oil in the rodless cavities of the left cylinder and the right cylinder smoothly flows back into the rod cavities of the synchronous cylinder through the first hydraulic control one-way valve and the second hydraulic control one-way valve, the piston of the synchronous cylinder returns back towards the rodless cavity, and the hydraulic oil in the rodless cavity returns to the oil tank through the one-way throttle valve;
c. the left cylinder alone advances: the hydraulic oil enters a rodless cavity of a left cylinder to push a piston to linearly move towards a rod cavity to apply work to an external load, and the hydraulic oil in the rod cavity of the left cylinder flows to an oil inlet on the left side of the three-position four-way electromagnetic directional valve II through an upper oil outlet and returns to an oil tank after passing through the electromagnetic directional valve, so that the independent propelling action of the left cylinder is completed smoothly;
d. the left cylinder alone retreats: the hydraulic oil enters a two-way three-position four-way electromagnetic reversing valve II through the proportional pressure flow composite valve, a rod cavity of a hydraulic oil entering a right cylinder pushes a piston to linearly move towards a rodless cavity, the piston cylinder retreats, the rodless cavity hydraulic oil of a left cylinder returns to an oil tank through an oil inlet of the left side of the three-position four-way electromagnetic reversing valve II after passing through the electromagnetic reversing valve, and the independent retreating action of the left cylinder is completed smoothly;
e. the right cylinder alone advances: the electromagnet of the proportional pressure flow composite valve and the electromagnet of the three-position four-way electromagnetic reversing valve III are electrified, hydraulic oil enters the two-way three-position four-way electromagnetic reversing valve III through the proportional pressure flow composite valve, hydraulic oil enters a rodless cavity of a right cylinder to push a piston to linearly move towards a rod cavity to apply work to an external load, hydraulic oil in the rod cavity of the right cylinder flows to an oil inlet on the left side of the three-position four-way electromagnetic reversing valve III through an upper oil outlet, returns to an oil tank after passing through the electromagnetic reversing valve, and the independent propelling action of the right cylinder is completed smoothly;
f. the right cylinder alone retreats: the electromagnet of the proportional pressure flow composite valve and the electromagnet of the three-position four-way electromagnetic reversing valve III are electrified, hydraulic oil enters the two-way three-position four-way electromagnetic reversing valve III through the proportional pressure flow composite valve, hydraulic oil enters a rod cavity of a right cylinder to push a piston to linearly move towards a rodless cavity, a piston rod retreats, hydraulic oil in the rodless cavity of the right cylinder returns to an oil tank after passing through an oil inlet of the three-left side of the three-position four-way electromagnetic reversing valve, and independent retreating action of the right cylinder is completed smoothly.
The beneficial effects of the invention are as follows: the synchronous feeding of the left and right axial propelling cylinders can be accurately controlled, and a complex and precise special control hydraulic loop or an electric control element are not needed for real-time servo feedback control. Meanwhile, the system can control the left cylinder and the right cylinder to be independently pushed, so that the use requirement is met, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention;
in the figure: 1. the proportional pressure flow combination valve comprises a first check valve, a first three-position four-way electromagnetic directional valve, a first 4 one-way throttle valve, a second 5 one-way throttle valve, a first 6 two-position electromagnetic directional valve, a second 7 one-way valve, a third 8 one-way valve, a first 9 one-way overflow valve, a second 10 overflow valve, a first 11 one-way hydraulic control valve, a second 12 one-way hydraulic control valve, a second 13 three-position four-way electromagnetic directional valve, a second 14 three-position four-way electromagnetic directional valve, a third 15 two-position electromagnetic directional valve, a second 16 one-way synchronous cylinder, a 17 right side cylinder, a left side cylinder, a 19 one-way pressure sensor, a second 20 one-way pressure sensor, a 21 one-way motor, a 22 one-way quantitative oil pump, a 23 one-way oil absorption filter screen, a 24 one-way cooler, a pressure gauge and a 25 oil tank.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1, the invention comprises a proportional pressure flow composite valve 1, a one-way valve 1, a three-position four-way electromagnetic directional valve 3, a one-way throttle valve 4, a pressure reducing valve 5, a two-position electromagnetic directional valve 6, a one-way valve two 7, a one-way valve three 8, an overflow valve one 9, an overflow valve two 10, a hydraulic control one-way valve one 11, a hydraulic control one-way valve two 12, a three-position four-way electromagnetic directional valve two 13, a three-position four-way electromagnetic directional valve three 14, a two-position electromagnetic directional valve two 15, a synchronous cylinder 16, a right cylinder 17, a left cylinder 18, an electric motor 21, a one-way quantitative oil pump 22, an oil tank 25, wherein the synchronous cylinder 16 is provided with two rod cavities and one rodless cavity, and the left cylinder 18 and the right cylinder 19 are respectively provided with a pressure sensor one 19 and a pressure sensor two 20 on oil paths of the left cylinder 18 and the right cylinder 17.
The working principle is as follows:
a. the left cylinder 18 and the right cylinder 17 advance synchronously: the electromagnets of the proportional pressure flow composite valve 1 and the three-position four-way electromagnetic directional valve I3 are powered on, the motor 21 is powered on, the coaxial unidirectional quantitative oil pump 22 starts to absorb oil, hydraulic oil in the oil tank 25 enters the proportional pressure flow composite valve 1 and then flows into the three-position four-way electromagnetic directional valve I3, passes through the unidirectional throttle valve 4 and then enters the rodless cavity of the synchronous cylinder 16), the synchronous cylinder piston is pushed to move towards the direction of the rod cavity, and the equal volume of high-pressure oil in the two rod cavities is discharged. The two paths of high-pressure oil enter rodless cavities of the left cylinder 18 and the right cylinder 19 through the first hydraulic control check valve 11 and the second hydraulic control check valve 12 respectively, push piston rods of the left cylinder 18 and the right cylinder 17 to synchronously move linearly, push a load to do work, and the first pressure sensor 19 and the second pressure sensor 20 are used for monitoring and reading the pressures of the left cylinder 18 and the right cylinder 19 in real time. The synchronous control of the synchronous cylinders 16 is same, and the pipeline diameter, the pipeline length, the volume of the oil cylinder, the movement resistance and the like of the oil liquid are almost the same, so that the synchronous precision of the left cylinder 18 and the right cylinder 17 is higher, and the synchronous precision of the two cylinders is smaller than 0.1mm through multiple actual measurement data.
b. The left cylinder 18 and the right cylinder 17 are retracted synchronously: the electromagnets of the proportional pressure flow composite valve 1, the three-position four-way electromagnetic reversing valve I3 and the two-position electromagnetic reversing valve II 15 are powered. Hydraulic oil passes through the proportional pressure flow composite valve 1, enters the three-position four-way electromagnetic directional valve I3, then enters rod cavities of the left cylinder 18 and the right cylinder 17, and pushes the cylinders at the two sides to move towards the rodless cavity. Meanwhile, hydraulic oil passes through the two-position four-way electromagnetic reversing valve II 15, the hydraulic control one-way valve I11 and the hydraulic control one-way valve II 12 are opened by a control oil way, hydraulic oil of rodless cavities of the left cylinder 18 and the right cylinder 17 smoothly flows back into rod cavities of the synchronous cylinder 16 through the hydraulic control one-way valve I11 and the hydraulic control one-way valve II 12, a piston of the synchronous cylinder 16 retreats towards the rodless cavities, the rodless cavity hydraulic oil smoothly realizes synchronous retreating of the left cylinder 18 and the right cylinder 17 through the one-way throttle valve 4, the one-way valve I2 returns to an oil tank system, the synchronous progress of the two cylinders in the retreating process is higher, and the synchronous precision of the two cylinders is smaller than 0.1mm through repeated actual measurement data display.
c. The left cylinder 18 alone advances: electromagnetic power is obtained by the proportional pressure flow composite valve 1 and the three-position four-way electromagnetic reversing valve II 13. Hydraulic oil enters a two-way three-position four-way electromagnetic reversing valve II 13 through a proportional pressure flow composite valve 1, and the hydraulic oil enters a rodless cavity of a left cylinder 18 to push a piston to linearly move towards a rod cavity, so that work is done on an external load. The hydraulic oil with a rod cavity of the left cylinder 18 flows to the left oil inlet of the second 13 side of the three-position four-way electromagnetic reversing valve through the upper oil outlet, returns to the oil tank after passing through the electromagnetic reversing valve, and singly pushes the left cylinder to finish smoothly.
d. The left cylinder 18 alone retreats: the ratio pressure flow composite valve 1 and the electromagnetic power supply of the three-position four-way electromagnetic directional valve II 13 are adopted, hydraulic oil enters the two-way three-position four-way electromagnetic directional valve II 13 through the ratio pressure flow composite valve 1, hydraulic oil enters the rod cavity of the right cylinder 18 to push the piston to linearly move towards the rodless cavity, the piston cylinder is retracted, the rodless cavity hydraulic oil of the left cylinder 18 enters the left side oil inlet of the three-position four-way electromagnetic directional valve II 13, and returns to the oil tank after passing through the electromagnetic directional valve, so that the independent retraction of the left cylinder 18 is completed smoothly.
e. The right cylinder 17 is advanced alone: the electromagnets of the proportional pressure flow composite valve 1 and the three-position four-way electromagnetic reversing valve three 14 are powered. Hydraulic oil enters a bidirectional three-position four-way electromagnetic directional valve III 14 through a proportional pressure flow composite valve 1, the hydraulic oil enters a rodless cavity of a right cylinder 17 to push a piston to linearly move towards a rod cavity, work is done on an external load, the hydraulic oil in the rod cavity of the right cylinder flows to a left side oil inlet of the three-position four-way electromagnetic directional valve III 14 through an upper oil outlet, returns to an oil tank after passing through the electromagnetic directional valve, and the independent pushing action of the right cylinder 17 is completed smoothly.
f. The right cylinder 17 alone retreats: the electromagnets of the proportional pressure flow composite valve 1 and the three-position four-way electromagnetic reversing valve three 14 are powered. Hydraulic oil enters the three-way three-position four-way electromagnetic directional valve III 14 through the proportional pressure flow composite valve 1, hydraulic oil enters the rod cavity of the right cylinder 17 to push the piston to linearly move towards the rodless cavity, the piston rod retreats, hydraulic oil in the rodless cavity of the right cylinder 17 enters an oil inlet at the left side of the three-position four-way electromagnetic directional valve III 14, returns to an oil tank through the electromagnetic directional valve, and the independent retreating action of the right cylinder 17 is completed smoothly.
And the oil way is also provided with a first overflow valve 9 and a second overflow valve 10 which are used for adjusting the pressure in the loop so as to realize the pushing action of the left cylinder 18 and the right cylinder 17 under different loads. The first electromagnetic directional valve 6 is used for supplementing oil in a loop, and when the system works rapidly, the electromagnet of the first electromagnetic directional valve 6 is powered on to work. The one-way valve I2 prevents the oil from flowing back to the proportional pressure flow composite valve 1, and the pressure reducing valve 5 plays a role in safety regulation. The first pressure sensor 19 and the second pressure sensor 20 are used to monitor and read the system pressure in real time.
The above embodiments are preferred examples of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions made without departing from the technical aspects of the present invention are included in the scope of the present invention.
Claims (1)
1. A precise synchronous hydraulic control system for cylinders at two sides of a high-pressure forming hydraulic press in a pipe comprises a proportional pressure flow composite valve, a first check valve, a first three-position four-way electromagnetic directional valve, a one-way throttle valve, a pressure reducing valve, a first two-position electromagnetic directional valve, a second check valve, a third check valve, a first overflow valve, a second overflow valve, a first hydraulic control one-way valve, a second three-position four-way electromagnetic directional valve, a third three-position four-way electromagnetic directional valve, a second two-position electromagnetic directional valve, a synchronous cylinder, a right cylinder, a left cylinder, a motor, a one-way quantitative oil pump and an oil tank, wherein the synchronous cylinder is provided with two rod cavities and a rodless cavity, the left cylinder and the right cylinder are respectively provided with a first pressure sensor and a second pressure sensor on oil paths of the left cylinder and the right cylinder,
the working principle is as follows:
a. the left side cylinder and the right side cylinder are synchronously propelled: the electromagnet of the proportional pressure flow composite valve and the electromagnet of the three-position four-way electromagnetic reversing valve I are powered on, the motor is powered on, a coaxial unidirectional quantitative oil pump starts to absorb oil, hydraulic oil in an oil tank enters the proportional pressure flow composite valve and then flows into the rodless cavity of the synchronous cylinder after passing through the unidirectional throttle valve I, the synchronous cylinder piston is pushed to move towards the direction of the rod cavity, equal volume high pressure oil in the two rod cavities is discharged, and the two paths of high pressure oil enter the rodless cavities of the left cylinder and the right cylinder through the hydraulic control one-way valve I and the hydraulic control one-way valve II respectively, so that piston rods of the left cylinder and the right cylinder are pushed to do synchronous linear motion, and load acting is pushed;
b. the left cylinder and the right cylinder are retracted synchronously: the hydraulic oil flows through the proportional pressure flow composite valve, the first three-position four-way electromagnetic reversing valve and the second two-position electromagnetic reversing valve, enters the first three-position four-way electromagnetic reversing valve, then enters rod cavities of the left cylinder and the right cylinder, pushes the two cylinders to move towards the rodless cavity, and simultaneously, the hydraulic oil flows through the second two-position four-way electromagnetic reversing valve, controls an oil way to open the first hydraulic control one-way valve and the second hydraulic control one-way valve, so that the hydraulic oil in the rodless cavities of the left cylinder and the right cylinder smoothly flows back into the rod cavities of the synchronous cylinder through the first hydraulic control one-way valve and the second hydraulic control one-way valve, the piston of the synchronous cylinder returns back towards the rodless cavity, and the hydraulic oil in the rodless cavity returns to the oil tank through the one-way throttle valve;
c. the left cylinder alone advances: the hydraulic oil enters a rodless cavity of a left cylinder to push a piston to linearly move towards a rod cavity to apply work to an external load, the hydraulic oil in the rod cavity of the left cylinder flows to an oil inlet on the left side of the three-position four-way electromagnetic directional valve through an upper oil outlet, returns to an oil tank after passing through the electromagnetic directional valve, and the independent propelling action of the left cylinder is completed smoothly;
d. the left cylinder alone retreats: the hydraulic oil enters a two-way three-position four-way electromagnetic reversing valve II through the proportional pressure flow composite valve, a rod cavity of a hydraulic oil entering a right cylinder pushes a piston to linearly move towards a rodless cavity, the piston cylinder retreats, the rodless cavity hydraulic oil of a left cylinder returns to an oil tank through an oil inlet of the left side of the three-position four-way electromagnetic reversing valve II after passing through the electromagnetic reversing valve, and the independent retreating action of the left cylinder is completed smoothly;
e. the right cylinder alone advances: the electromagnet of the proportional pressure flow composite valve and the electromagnet of the three-position four-way electromagnetic reversing valve III are electrified, hydraulic oil enters the two-way three-position four-way electromagnetic reversing valve III through the proportional pressure flow composite valve, hydraulic oil enters a rodless cavity of a right cylinder to push a piston to linearly move towards a rod cavity to apply work to an external load, hydraulic oil in the rod cavity of the right cylinder flows to an oil inlet on the left side of the three-position four-way electromagnetic reversing valve III through an upper oil outlet, returns to an oil tank after passing through the electromagnetic reversing valve, and the independent propelling action of the right cylinder is completed smoothly;
f. the right cylinder alone retreats: the electromagnet of the proportional pressure flow composite valve and the electromagnet of the three-position four-way electromagnetic reversing valve III are electrified, hydraulic oil enters the two-way three-position four-way electromagnetic reversing valve III through the proportional pressure flow composite valve, hydraulic oil enters a rod cavity of a right cylinder to push a piston to linearly move towards a rodless cavity, a piston rod retreats, hydraulic oil in the rodless cavity of the right cylinder returns to an oil tank after passing through an oil inlet of the three-left side of the three-position four-way electromagnetic reversing valve, and independent retreating action of the right cylinder is completed smoothly.
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| CN107344424B (en) * | 2017-04-17 | 2023-06-02 | 扬力集团股份有限公司 | Hydraulic control system of double-point high-speed press |
| CN109838424B (en) * | 2017-11-27 | 2024-06-14 | 华澳装备科技(盐城)有限公司 | High-precision mode locking pressure hydraulic control loop and control method |
| CN109505813B (en) * | 2018-12-26 | 2024-02-06 | 中冶京诚工程技术有限公司 | Hydraulic synchronous control device |
| CN110296114A (en) * | 2019-07-29 | 2019-10-01 | 浙江省机械工业情报研究所 | A kind of agricultural machinery suspension mechanism hydraulic levels control system of fast lifting |
| CN112576564B (en) * | 2020-11-26 | 2023-01-24 | 天津市天锻压力机有限公司 | Pressure balance protection device of double-side horizontal side extrusion cylinder of large servo press |
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| CN2484171Y (en) * | 2001-06-09 | 2002-04-03 | 方国权 | Three-way pipe hydraulic forming machine |
| JP2007144455A (en) * | 2005-11-28 | 2007-06-14 | Bridgestone Corp | Speed controller for multiple cylinder type press |
| CN201582232U (en) * | 2009-12-15 | 2010-09-15 | 天水锻压机床有限公司 | Hydraulic control system for coordinated use of proportional pump and electro-hydraulic proportional direction value with intermediate and small drift diameter |
| CN101864965B (en) * | 2010-05-17 | 2012-08-08 | 浙江大学 | Pressure flow rate composite synchronization control energy-saving type shield propelling system |
| CN105201951B (en) * | 2015-10-16 | 2017-03-01 | 浙江大学 | The controlled TBM support hydraulic pressure system of high-efficiency high-accuracy flow |
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