CN107756864B - Hydraulic press - Google Patents

Hydraulic press Download PDF

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Publication number
CN107756864B
CN107756864B CN201710943255.5A CN201710943255A CN107756864B CN 107756864 B CN107756864 B CN 107756864B CN 201710943255 A CN201710943255 A CN 201710943255A CN 107756864 B CN107756864 B CN 107756864B
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China
Prior art keywords
oil
valve
control valve
control
upper cavity
Prior art date
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Application number
CN201710943255.5A
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Chinese (zh)
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CN107756864A (en
Inventor
屈盛官
尹嵘
陆俞
沈红立
兰秀辉
陈轼轩
冯松生
郭富文
陈志洪
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Guangdong Metal Forming Machine Works Co ltd
South China University of Technology SCUT
Original Assignee
Guangdong Metal Forming Machine Works Co ltd
South China University of Technology SCUT
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Application filed by Guangdong Metal Forming Machine Works Co ltd, South China University of Technology SCUT filed Critical Guangdong Metal Forming Machine Works Co ltd
Priority to CN201710943255.5A priority Critical patent/CN107756864B/en
Publication of CN107756864A publication Critical patent/CN107756864A/en
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Publication of CN107756864B publication Critical patent/CN107756864B/en
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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
    • B30B15/161—Control 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
    • F15B2013/004—Cartridge valves

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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)

Abstract

The invention discloses a master cylinder control oil way which comprises a master cylinder, a first hydraulic source, a second hydraulic source, a master cylinder upper cavity control oil way, a master cylinder lower cavity control oil way, a master cylinder oil return way and an oil tank, wherein the master cylinder is connected with the first hydraulic source; the first hydraulic source comprises a first liquid pump, a first control valve for controlling an oil return tank pumped by the first liquid pump, and a second control valve for controlling the oil pumped by the first liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way; the second hydraulic source comprises a second liquid pump, a third control valve for controlling an oil return tank pumped by the second liquid pump, and a fourth control valve for controlling the oil pumped by the second liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way; the invention has the advantages of high pressure, high speed and high control precision, and is suitable for the sheet stretching and stamping process. The upper cavity, the lower cavity and the upper cavity of the lower cylinder are independently controlled, so that higher control precision can be achieved.

Description

Hydraulic press
Technical Field
The invention relates to the field of hydraulic devices, in particular to a hydraulic machine.
Background
Hydraulic presses are machines made according to pascal principle for transferring energy to realize various processes, with liquids as working medium. The hydraulic machine generally comprises a main machine, a power system and a hydraulic control system. The hydraulic press is suitable for the pressing process of plastic materials, such as sheet stretching and bending, and can also be used for correction, press fitting and other pressing forming processes. The hydraulic press has independent power mechanism and electric system, and adopts centralized control to realize various operation modes of adjustment, manual operation, automatic operation, etc.
With the development of modern automobile industry, electronic technology and national defense industry, the demands of the domestic market for stamping equipment, especially high-speed stamping equipment, are increasing. At present, most of the domestic hydraulic presses used for high-speed stamping equipment are imported, the cost is high, and the hydraulic press is not suitable for the national conditions of China. In order to respond to energy-saving measures and realize high-precision control, a servo closed-loop control system is mostly adopted in the hydraulic machine which is independently developed in China, and the control system is usually provided with a single servo motor and a single pump, but for large hydraulic machines with large tonnage and high requirement speed, the power of the single servo motor is limited.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention aims at: a hydraulic machine is provided.
The aim of the invention is achieved by the following technical scheme: a hydraulic press comprises a main cylinder control oil way, a lower cylinder control oil way, an upper pressing table and a lower pressing table;
the master cylinder control oil circuit comprises a master cylinder, a first hydraulic source, a second hydraulic source, a master cylinder upper cavity control oil circuit, a master cylinder lower cavity control oil circuit, a master cylinder oil return circuit and an oil tank;
the first hydraulic source comprises a first liquid pump, a first control valve for controlling an oil return tank pumped by the first liquid pump, and a second control valve for controlling the oil pumped by the first liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way;
the second hydraulic source comprises a second liquid pump, a third control valve for controlling an oil return tank pumped by the second liquid pump, and a fourth control valve for controlling the oil pumped by the second liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way;
the master cylinder oil return circuit comprises a fifth control valve for controlling the oil return tank of the oil liquid in the master cylinder upper cavity control oil circuit and a sixth control valve for controlling the oil return tank of the oil liquid in the master cylinder lower cavity control oil circuit;
the master cylinder upper cavity control oil way comprises a master cylinder upper cavity control valve, two oil inlets of the master cylinder upper cavity control valve are respectively connected with a second control valve and a fourth control valve, the upper cavity of the master cylinder is respectively connected with an oil outlet of the master cylinder upper cavity control valve and a fifth control valve, and the fifth control valve is connected with the oil outlet and the oil tank;
the master cylinder lower cavity control oil way comprises a seventh control valve and an eighth control valve, two oil inlets of the seventh control valve are respectively connected with the second control valve and the fourth control valve, an oil outlet of the seventh control valve is connected with the eighth control valve, and the eighth control valve is connected with the master cylinder lower cavity and an oil inlet of the sixth control valve;
the lower cylinder control oil way comprises a lower cylinder, a lower cylinder upper cavity oil inlet control valve for controlling oil inlet of an upper cavity of the lower cylinder, a lower cylinder lower cavity oil inlet control valve for controlling oil inlet of a lower cavity of the lower cylinder, a lower cylinder upper cavity oil return control valve and a lower cylinder oil return total control valve;
an oil inlet of an upper cavity oil inlet control valve of the lower cylinder is connected with a first hydraulic source and a second hydraulic source, an oil outlet of the upper cavity oil inlet control valve of the lower cylinder is connected with an upper cavity of the lower cylinder, an oil inlet of an oil return control valve of the upper cavity of the lower cylinder is connected with an upper cavity of the lower cylinder, an oil outlet of an oil return control valve of the upper cavity of the lower cylinder is connected with a lower oil return total control valve of the lower cylinder, an oil inlet of an oil inlet control valve of the lower cavity of the lower cylinder is connected with a lower cavity of the lower cylinder, an oil inlet of an oil return total control valve of the lower cylinder is connected with an oil tank;
the piston rod of the main cylinder is connected with the upper pressing table, and the piston rod of the lower cylinder is connected with the lower pressing table.
Preferably, the master cylinder control oil way further comprises a master cylinder quick oil return oil way, the master cylinder quick oil return oil way comprises a first one-way valve and a ninth control valve for controlling the first one-way valve to be opened and closed, an oil inlet of the first one-way valve is connected with an upper cavity of the master cylinder, and an oil outlet of the first one-way valve is connected with the oil tank.
Preferably, the first control valve comprises a first cartridge valve and a first three-position four-way electromagnetic directional valve for controlling the opening and closing of the first cartridge valve; the second control valve is a second cartridge valve and is used for controlling the first two-position four-way electromagnetic reversing valve of the second cartridge valve to be opened and closed; the third control valve comprises a third cartridge valve and a second two-position four-way electromagnetic reversing valve used for controlling the opening and closing of the third cartridge valve; the fourth control valve is a fourth cartridge valve;
the oil inlet of the first cartridge valve is connected with the oil outlet of the first liquid pump, the oil outlet of the first cartridge valve is connected with the oil tank, the oil inlet of the third cartridge valve is connected with the oil outlet of the second liquid pump, the oil outlet of the third cartridge valve is connected with the oil tank, two oil inlets of the control valve of the upper cavity of the master cylinder are respectively connected with the oil outlets of the second cartridge valve and the fourth cartridge valve, and two oil inlets of the seventh control valve are respectively connected with the oil outlets of the second cartridge valve and the fourth cartridge valve.
Preferably, the fifth control valve is a fifth cartridge valve; the sixth control valve comprises a sixth cartridge valve and a second three-position four-way electromagnetic reversing valve for controlling the opening and closing of the sixth cartridge valve;
the oil inlet of the fifth cartridge valve is connected with the upper cavity of the master cylinder, the oil outlet of the fifth cartridge valve is connected with the oil tank, the oil inlet of the sixth cartridge valve is connected with the eighth control valve, and the oil outlet of the sixth cartridge valve is connected with the oil tank.
Preferably, the master cylinder upper cavity control valve comprises an upper cavity cartridge valve and a third two-position four-way electromagnetic reversing valve for controlling the upper cavity cartridge valve to be opened and closed, two oil inlets of the upper cavity cartridge valve are respectively connected with the second control valve and the fourth control valve, and an oil outlet of the upper cavity cartridge valve is connected with the upper cavity of the master cylinder.
Preferably, the seventh control valve comprises a seventh cartridge valve and a fourth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the seventh cartridge valve, the eighth control valve comprises an eighth cartridge valve and a fifth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the eighth cartridge valve, two oil inlets of an oil inlet of the seventh cartridge valve are respectively connected with the second control valve and the fourth control valve, an oil outlet of the seventh cartridge valve is connected with the eighth cartridge valve, and the eighth cartridge valve is connected with a master cylinder lower cavity and an oil inlet of the sixth control valve.
Preferably, the upper cavity oil inlet control valve of the lower cylinder comprises a ninth cartridge valve and a sixth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the ninth cartridge valve, an oil inlet of the ninth cartridge valve is connected with the first hydraulic source and the second hydraulic source, and an oil outlet of the ninth cartridge valve is connected with the upper cavity of the lower cylinder.
Preferably, the lower cylinder lower cavity oil inlet control valve comprises a tenth cartridge valve and a seventh two-position four-way electromagnetic reversing valve for controlling the opening and closing of the tenth cartridge valve, an oil inlet of the tenth cartridge valve is connected with the first hydraulic source and the second hydraulic source, and an oil outlet of the tenth cartridge valve is connected with the lower cylinder upper cavity.
Preferably, the lower cylinder upper cavity oil return control valve comprises an eleventh cartridge valve and an eighth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the eleventh cartridge valve, and the lower cylinder oil return main control valve comprises a twelfth cartridge valve and a third three-position four-way electromagnetic reversing valve for controlling the opening and closing of the twelfth cartridge valve; an oil inlet of the eleventh cartridge valve is connected with the upper cavity of the lower cylinder, two oil inlets of the twelfth cartridge valve are respectively connected with an oil outlet of the eleventh cartridge valve and the upper cavity of the lower cylinder, and an oil outlet of the twelfth cartridge valve is connected with the oil tank.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention has the advantages of high pressure, high speed and high control precision, and is suitable for the sheet stretching and stamping process. The upper cavity, the lower cavity and the upper cavity of the lower cylinder are independently controlled, so that higher control precision can be achieved.
2. The invention can combine two working conditions of stretching and stamping, and reduce the number and cost of equipment.
3. When the first hydraulic pressure source and the second hydraulic pressure source of the present invention can be operated simultaneously or alternatively, for example: when the first hydraulic pressure source fails, the hydraulic pressure source can be switched to the second hydraulic pressure source, the whole equipment cannot be used because one oil pump is damaged, and meanwhile, the hydraulic pressure regulating device can also play a role in regulating the pressure. In addition, the working pressure and the travel range of the invention can be adjusted according to the process requirements.
4. The invention adopts an advanced cartridge valve integrated system, and the cartridge valve has large through flow, pollution resistance, flexible control, reliable performance and convenient maintenance.
Drawings
FIG. 1 is a schematic view of a master cylinder control oil passage of the present invention;
fig. 2 is a schematic view of the lower cylinder control oil passage of the present invention.
The hydraulic control system comprises a main cylinder 1, a main cylinder 2, a first liquid pump 3, a lower cylinder 4, a first one-way valve 5, a ninth control valve 6, a second liquid pump 7, a first cartridge valve 8, a first three-position four-way electromagnetic reversing valve 9, a second cartridge valve 10, a first two-position four-way electromagnetic reversing valve 11, a third cartridge valve 12, a second two-position four-way electromagnetic reversing valve 13, a fourth cartridge valve 14, a second three-position four-way electromagnetic reversing valve 15, a sixth cartridge valve 16, a fifth cartridge valve 17, an upper cavity cartridge valve 18, a third two-position four-way electromagnetic reversing valve 19, a seventh cartridge valve 20, a fourth two-position four-way electromagnetic reversing valve 21, an eighth cartridge valve 22, a fifth two-position four-way electromagnetic reversing valve 23, a ninth cartridge valve 24, a sixth two-position four-way electromagnetic reversing valve 25, a tenth cartridge valve 26, a seventh two-position electromagnetic reversing valve 27, an eleventh two-position four-way electromagnetic reversing valve 28, a fourth two-way electromagnetic reversing valve 29, a twelfth two-position four-way electromagnetic reversing valve 30 and a third electromagnetic reversing valve.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Embodiment one:
a hydraulic press comprises a main cylinder control oil way, a lower cylinder control oil way, an upper pressing table and a lower pressing table;
the master cylinder control oil circuit comprises a master cylinder, a first hydraulic source, a second hydraulic source, a master cylinder upper cavity control oil circuit, a master cylinder lower cavity control oil circuit, a master cylinder oil return circuit and an oil tank;
the first hydraulic source comprises a first liquid pump, a first control valve for controlling an oil return tank pumped by the first liquid pump, and a second control valve for controlling the oil pumped by the first liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way;
the second hydraulic source comprises a second liquid pump, a third control valve for controlling an oil return tank pumped by the second liquid pump, and a fourth control valve for controlling the oil pumped by the second liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way;
the master cylinder oil return circuit comprises a fifth control valve for controlling the oil return tank of the oil liquid in the master cylinder upper cavity control oil circuit and a sixth control valve for controlling the oil return tank of the oil liquid in the master cylinder lower cavity control oil circuit;
the master cylinder upper cavity control oil way comprises a master cylinder upper cavity control valve, two oil inlets of the master cylinder upper cavity control valve are respectively connected with a second control valve and a fourth control valve, the upper cavity of the master cylinder is respectively connected with an oil outlet of the master cylinder upper cavity control valve and a fifth control valve, and the fifth control valve is connected with the oil outlet and the oil tank;
the master cylinder lower cavity control oil way comprises a seventh control valve and an eighth control valve, two oil inlets of the seventh control valve are respectively connected with the second control valve and the fourth control valve, an oil outlet of the seventh control valve is connected with the eighth control valve, and the eighth control valve is connected with the master cylinder lower cavity and an oil inlet of the sixth control valve;
the lower cylinder control oil way comprises a lower cylinder, a lower cylinder upper cavity oil inlet control valve for controlling oil inlet of an upper cavity of the lower cylinder, a lower cylinder lower cavity oil inlet control valve for controlling oil inlet of a lower cavity of the lower cylinder, a lower cylinder upper cavity oil return control valve and a lower cylinder oil return total control valve;
an oil inlet of an upper cavity oil inlet control valve of the lower cylinder is connected with a first hydraulic source and a second hydraulic source, an oil outlet of the upper cavity oil inlet control valve of the lower cylinder is connected with an upper cavity of the lower cylinder, an oil inlet of an oil return control valve of the upper cavity of the lower cylinder is connected with an upper cavity of the lower cylinder, an oil outlet of an oil return control valve of the upper cavity of the lower cylinder is connected with a lower oil return total control valve of the lower cylinder, an oil inlet of an oil inlet control valve of the lower cavity of the lower cylinder is connected with a lower cavity of the lower cylinder, an oil inlet of an oil return total control valve of the lower cylinder is connected with an oil tank;
the piston rod of the main cylinder is connected with the upper pressing table, and the piston rod of the lower cylinder is connected with the lower pressing table.
Preferably, the master cylinder control oil way further comprises a master cylinder quick oil return oil way, the master cylinder quick oil return oil way comprises a first one-way valve and a ninth control valve for controlling the first one-way valve to be opened and closed, an oil inlet of the first one-way valve is connected with an upper cavity of the master cylinder, and an oil outlet of the first one-way valve is connected with the oil tank. The ninth control valve may be a battery valve.
Preferably, the first control valve comprises a first cartridge valve and a first three-position four-way electromagnetic directional valve for controlling the opening and closing of the first cartridge valve; the second control valve is a second cartridge valve and is used for controlling the first two-position four-way electromagnetic reversing valve of the second cartridge valve to be opened and closed; the third control valve comprises a third cartridge valve and a second two-position four-way electromagnetic reversing valve used for controlling the opening and closing of the third cartridge valve; the fourth control valve is a fourth cartridge valve;
the oil inlet of the first cartridge valve is connected with the oil outlet of the first liquid pump, the oil outlet of the first cartridge valve is connected with the oil tank, the oil inlet of the third cartridge valve is connected with the oil outlet of the second liquid pump, the oil outlet of the third cartridge valve is connected with the oil tank, two oil inlets of the control valve of the upper cavity of the master cylinder are respectively connected with the oil outlets of the second cartridge valve and the fourth cartridge valve, and two oil inlets of the seventh control valve are respectively connected with the oil outlets of the second cartridge valve and the fourth cartridge valve.
Preferably, the fifth control valve is a fifth cartridge valve; the sixth control valve comprises a sixth cartridge valve and a second three-position four-way electromagnetic reversing valve for controlling the opening and closing of the sixth cartridge valve;
the oil inlet of the fifth cartridge valve is connected with the upper cavity of the master cylinder, the oil outlet of the fifth cartridge valve is connected with the oil tank, the oil inlet of the sixth cartridge valve is connected with the eighth control valve, and the oil outlet of the sixth cartridge valve is connected with the oil tank.
Preferably, the master cylinder upper cavity control valve comprises an upper cavity cartridge valve and a third two-position four-way electromagnetic reversing valve for controlling the upper cavity cartridge valve to be opened and closed, two oil inlets of the upper cavity cartridge valve are respectively connected with the second control valve and the fourth control valve, and an oil outlet of the upper cavity cartridge valve is connected with the upper cavity of the master cylinder.
Preferably, the seventh control valve comprises a seventh cartridge valve and a fourth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the seventh cartridge valve, the eighth control valve comprises an eighth cartridge valve and a fifth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the eighth cartridge valve, two oil inlets of an oil inlet of the seventh cartridge valve are respectively connected with the second control valve and the fourth control valve, an oil outlet of the seventh cartridge valve is connected with the eighth cartridge valve, and the eighth cartridge valve is connected with a master cylinder lower cavity and an oil inlet of the sixth control valve.
Preferably, the upper cavity oil inlet control valve of the lower cylinder comprises a ninth cartridge valve and a sixth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the ninth cartridge valve, an oil inlet of the ninth cartridge valve is connected with the first hydraulic source and the second hydraulic source, and an oil outlet of the ninth cartridge valve is connected with the upper cavity of the lower cylinder.
Preferably, the lower cylinder lower cavity oil inlet control valve comprises a tenth cartridge valve and a seventh two-position four-way electromagnetic reversing valve for controlling the opening and closing of the tenth cartridge valve, an oil inlet of the tenth cartridge valve is connected with the first hydraulic source and the second hydraulic source, and an oil outlet of the tenth cartridge valve is connected with the lower cylinder upper cavity.
Preferably, the lower cylinder upper cavity oil return control valve comprises an eleventh cartridge valve and an eighth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the eleventh cartridge valve, and the lower cylinder oil return main control valve comprises a twelfth cartridge valve and a third three-position four-way electromagnetic reversing valve for controlling the opening and closing of the twelfth cartridge valve; an oil inlet of the eleventh cartridge valve is connected with the upper cavity of the lower cylinder, two oil inlets of the twelfth cartridge valve are respectively connected with an oil outlet of the eleventh cartridge valve and the upper cavity of the lower cylinder, and an oil outlet of the twelfth cartridge valve is connected with the oil tank.
The working process and the working principle of the invention are as follows: the invention is somewhat of a specification of both jog and semiautomatic modes, the working principle of which is briefly described here in terms of semiautomatic duty cycles. When semi-automatic circulation is performed, the action sequence of each actuating mechanism is as follows: the piston rod of the main cylinder drives the upper pressing table to fast descend, the upper pressing table performs working pressing, pressure maintaining and pressure relief, the upper pressing table ascends, the piston rod of the lower cylinder drives the lower pressing table to ascend, the main cylinder stops, and the lower cylinder stops.
The first cartridge valve and the third cartridge valve are opened, and oil sent by the first hydraulic source and the second hydraulic source is returned to the oil tank through the first cartridge valve and the third cartridge valve respectively, so that oil pump unloading is realized.
The upper pressing table fast descends: the first cartridge valve, the third cartridge valve, the fifth cartridge valve and the first one-way valve are closed, the second cartridge valve, the fourth cartridge valve and the upper cavity cartridge valve are opened, oil liquid sent out by the first hydraulic source and the second hydraulic source is respectively output to the upper cavity of the main cylinder, and at the moment, the hydraulic oil cylinder is in an idle state, and a piston rod of the main cylinder and the upper pressing table rapidly descend.
And (5) carrying out working press on an upper press table: when the upper pressing table reaches a system working inlet set value, the sixth cartridge valve is opened, oil in the lower cavity of the main cylinder flows back to the oil tank after being pressed through the eighth cartridge valve and the sixth cartridge valve, at the moment, the upper pressing table decelerates downwards, the negative pressure in the upper cavity of the main cylinder disappears, and the upper pressing table is transferred into a main cylinder working inlet pressing stroke from fast descending.
Pressure maintaining/releasing: when the upper pressing table descends to a set lower limit position, the second cartridge valve, the fourth cartridge valve and the upper cavity cartridge valve are closed, the upper pressing table is in a pressure maintaining state, and when the upper pressing table is depressurized, the ninth control valve controls the first one-way valve to be opened, and the upper cavity of the main cylinder is unloaded, so that preparation is made for reversing.
Ascending the upper pressing table: the first cartridge valve and the third cartridge valve are closed, the second cartridge valve, the fourth cartridge valve and the seventh cartridge valve are opened, and the eighth cartridge valve is switched to a state of delivering oil to the lower cavity of the main cylinder, and the oil delivered by the first hydraulic source and the second hydraulic source is input into the lower cavity of the main cylinder through the seventh cartridge valve and the eighth cartridge valve, so that the upper pressing table quickly rises. The major part of the oil in the upper cavity of the main cylinder returns to the oil tank through the ninth control valve, and the minor part returns to the oil tank through the fifth cartridge valve.
And (3) ascending a pressing table: when the upper pressing table is lifted to a set value, oil liquid sent by the first hydraulic source and the second hydraulic source enters a lower cavity of the lower cylinder through a tenth cartridge valve, the eleventh cartridge valve is opened, the twelfth cartridge valve is switched to be communicated with the eleventh cartridge valve, the oil liquid in the upper cavity of the lower cylinder is quickly returned to the oil tank after passing through the eleventh cartridge valve and the twelfth cartridge valve, and the lower cylinder pushes the lower pressing table to quickly ascend.
Master cylinder stopping: when the upper pressing table descends to a set position, the first cartridge valve and the third cartridge valve are communicated, oil output by the first liquid pump and the second liquid pump returns to the oil tank through the first cartridge valve and the third cartridge valve respectively, the first one-way valve, the upper cavity cartridge valve, the seventh cartridge valve and the eighth cartridge valve are closed, and the oil pressure of the upper cavity of the main cylinder and the oil pressure of the lower cavity of the main cylinder are kept unchanged.
The lower cylinder is stopped: when the lower pressing table ascends to a set position, the first cartridge valve and the third cartridge valve are connected, oil liquid output by the first liquid pump and the second liquid pump is returned to the oil tank through the first cartridge valve and the third cartridge valve respectively, and the ninth cartridge valve and the tenth cartridge valve are closed.
The oil supply to the master cylinder and the lower cylinder may be respectively output from the first liquid pump and the second liquid pump, and at this time, only the first cartridge valve may be opened when the master cylinder is stopped, and only the third cartridge valve may be opened when the lower cylinder is stopped.
The first hydraulic source and the second hydraulic source can work simultaneously to supply oil for the main cylinder or alternatively supply oil for the main cylinder; the first hydraulic source and the second hydraulic source can be simultaneously used for supplying oil to the lower cylinder or alternatively used for supplying oil to the lower cylinder.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (8)

1. A hydraulic machine, characterized in that: comprises a main cylinder control oil way, a lower cylinder control oil way, an upper pressing table and a lower pressing table;
the master cylinder control oil circuit comprises a master cylinder, a first hydraulic source, a second hydraulic source, a master cylinder upper cavity control oil circuit, a master cylinder lower cavity control oil circuit, a master cylinder oil return circuit and an oil tank;
the first hydraulic source comprises a first liquid pump, a first control valve for controlling an oil return tank pumped by the first liquid pump, and a second control valve for controlling the oil pumped by the first liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way;
the second hydraulic source comprises a second liquid pump, a third control valve for controlling an oil return tank pumped by the second liquid pump, and a fourth control valve for controlling the oil pumped by the second liquid pump to be output to a master cylinder upper cavity control oil way and a master cylinder lower cavity control oil way;
the master cylinder oil return circuit comprises a fifth control valve for controlling the oil return tank of the oil liquid in the master cylinder upper cavity control oil circuit and a sixth control valve for controlling the oil return tank of the oil liquid in the master cylinder lower cavity control oil circuit;
the master cylinder upper cavity control oil way comprises a master cylinder upper cavity control valve, two oil inlets of the master cylinder upper cavity control valve are respectively connected with a second control valve and a fourth control valve, the upper cavity of the master cylinder is respectively connected with an oil outlet of the master cylinder upper cavity control valve and a fifth control valve, and the fifth control valve is connected with the oil outlet and the oil tank;
the master cylinder lower cavity control oil way comprises a seventh control valve and an eighth control valve, two oil inlets of the seventh control valve are respectively connected with the second control valve and the fourth control valve, an oil outlet of the seventh control valve is connected with the eighth control valve, and the eighth control valve is connected with the master cylinder lower cavity and an oil inlet of the sixth control valve;
the lower cylinder control oil way comprises a lower cylinder, a lower cylinder upper cavity oil inlet control valve for controlling oil inlet of an upper cavity of the lower cylinder, a lower cylinder lower cavity oil inlet control valve for controlling oil inlet of a lower cavity of the lower cylinder, a lower cylinder upper cavity oil return control valve and a lower cylinder oil return total control valve;
an oil inlet of an upper cavity oil inlet control valve of the lower cylinder is connected with a first hydraulic source and a second hydraulic source, an oil outlet of the upper cavity oil inlet control valve of the lower cylinder is connected with an upper cavity of the lower cylinder, an oil inlet of an oil return control valve of the upper cavity of the lower cylinder is connected with an upper cavity of the lower cylinder, an oil outlet of an oil return control valve of the upper cavity of the lower cylinder is connected with a lower oil return total control valve of the lower cylinder, an oil inlet of an oil inlet control valve of the lower cavity of the lower cylinder is connected with a lower cavity of the lower cylinder, an oil inlet of an oil return total control valve of the lower cylinder is connected with an oil tank;
a piston rod of the main cylinder is connected with the upper pressing table, and a piston rod of the lower cylinder is connected with the lower pressing table;
the master cylinder control oil way further comprises a master cylinder quick oil return oil way, the master cylinder quick oil return oil way comprises a first one-way valve and a ninth control valve for controlling the first one-way valve to be opened and closed, an oil inlet of the first one-way valve is connected with an upper cavity of the master cylinder, and an oil outlet of the first one-way valve is connected with an oil tank;
the first control valve comprises a first cartridge valve and a first three-position four-way electromagnetic reversing valve used for controlling the first cartridge valve to be opened and closed.
2. The hydraulic machine of claim 1, wherein: the second control valve is a second cartridge valve and is used for controlling the first two-position four-way electromagnetic reversing valve of the second cartridge valve to be opened and closed; the third control valve comprises a third cartridge valve and a second two-position four-way electromagnetic reversing valve used for controlling the opening and closing of the third cartridge valve; the fourth control valve is a fourth cartridge valve;
the oil inlet of the first cartridge valve is connected with the oil outlet of the first liquid pump, the oil outlet of the first cartridge valve is connected with the oil tank, the oil inlet of the third cartridge valve is connected with the oil outlet of the second liquid pump, the oil outlet of the third cartridge valve is connected with the oil tank, two oil inlets of the control valve of the upper cavity of the master cylinder are respectively connected with the oil outlets of the second cartridge valve and the fourth cartridge valve, and two oil inlets of the seventh control valve are respectively connected with the oil outlets of the second cartridge valve and the fourth cartridge valve.
3. The hydraulic machine of claim 1, wherein: the fifth control valve is a fifth cartridge valve; the sixth control valve comprises a sixth cartridge valve and a second three-position four-way electromagnetic reversing valve for controlling the opening and closing of the sixth cartridge valve;
the oil inlet of the fifth cartridge valve is connected with the upper cavity of the master cylinder, the oil outlet of the fifth cartridge valve is connected with the oil tank, the oil inlet of the sixth cartridge valve is connected with the eighth control valve, and the oil outlet of the sixth cartridge valve is connected with the oil tank.
4. The hydraulic machine of claim 1, wherein: the master cylinder upper cavity control valve comprises an upper cavity cartridge valve and a third two-position four-way electromagnetic reversing valve used for controlling the upper cavity cartridge valve to be opened and closed, two oil inlets of the upper cavity cartridge valve are respectively connected with the second control valve and the fourth control valve, and an oil outlet of the upper cavity cartridge valve is connected with an upper cavity of the master cylinder.
5. The hydraulic machine of claim 1, wherein: the seventh control valve comprises a seventh cartridge valve and a fourth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the seventh cartridge valve, the eighth control valve comprises an eighth cartridge valve and a fifth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the eighth cartridge valve, two oil inlets of the seventh cartridge valve are respectively connected with the second control valve and the fourth control valve, an oil outlet of the seventh cartridge valve is connected with the eighth cartridge valve, and the eighth cartridge valve is connected with a master cylinder lower cavity and an oil inlet of the sixth control valve.
6. The hydraulic machine of claim 1, wherein: the lower cylinder upper cavity oil inlet control valve comprises a ninth cartridge valve and a sixth two-position four-way electromagnetic reversing valve for controlling the opening and closing of the ninth cartridge valve, an oil inlet of the ninth cartridge valve is connected with a first hydraulic source and a second hydraulic source, and an oil outlet of the ninth cartridge valve is connected with the lower cylinder upper cavity.
7. The hydraulic machine as recited in claim 6 wherein: the lower cylinder lower cavity oil inlet control valve comprises a tenth cartridge valve and a seventh two-position four-way electromagnetic reversing valve for controlling the opening and closing of the tenth cartridge valve, an oil inlet of the tenth cartridge valve is connected with a first hydraulic source and a second hydraulic source, and an oil outlet of the tenth cartridge valve is connected with the lower cylinder upper cavity.
8. The hydraulic machine of claim 7, wherein: the lower cylinder upper cavity oil return control valve comprises an eleventh cartridge valve and an eighth two-position four-way electromagnetic directional valve for controlling the opening and closing of the eleventh cartridge valve, and the lower cylinder oil return main control valve comprises a twelfth cartridge valve and a third three-position four-way electromagnetic directional valve for controlling the opening and closing of the twelfth cartridge valve; an oil inlet of the eleventh cartridge valve is connected with the upper cavity of the lower cylinder, two oil inlets of the twelfth cartridge valve are respectively connected with an oil outlet of the eleventh cartridge valve and the upper cavity of the lower cylinder, and an oil outlet of the twelfth cartridge valve is connected with the oil tank.
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CN109203555B (en) * 2018-10-25 2020-07-03 扬力集团股份有限公司 Double-cylinder hydraulic ejection control system and method thereof
CN113819098A (en) * 2021-10-18 2021-12-21 山东泰丰智能控制股份有限公司 Hydraulic control system of hydraulic brick press
CN113819102B (en) * 2021-10-18 2023-08-08 山东泰丰智能控制股份有限公司 Hydraulic control system of cotton baler

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