CN112211863A - Wet-pressing forming servo pump control hydraulic system - Google Patents

Wet-pressing forming servo pump control hydraulic system Download PDF

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Publication number
CN112211863A
CN112211863A CN202011070370.4A CN202011070370A CN112211863A CN 112211863 A CN112211863 A CN 112211863A CN 202011070370 A CN202011070370 A CN 202011070370A CN 112211863 A CN112211863 A CN 112211863A
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China
Prior art keywords
valve
electromagnetic directional
port
cartridge
pressure
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Granted
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CN202011070370.4A
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Chinese (zh)
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CN112211863B (en
Inventor
乔礼惠
熊国云
陆烨
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Jiangsu Yangli Hydraulic Equipment Co ltd
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Jiangsu Guoli Forging Machine Tool Co Ltd
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Priority to CN202011070370.4A priority Critical patent/CN112211863B/en
Publication of CN112211863A publication Critical patent/CN112211863A/en
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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
    • F15B11/17—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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • 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
    • 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
    • F15B13/027—Check valves
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a wet-pressing forming servo pump control hydraulic system which comprises a main pressure oil path and a main cylinder connected with a sliding block, wherein the upper cavity of the main cylinder is connected with an oil tank through a hydraulic control liquid filling valve; the outlet of the cartridge valve IV is connected with the inlet of the cartridge valve V, and the outlet of the cartridge valve V is connected with the lower cavity of the main cylinder. The main pressure oil way is also connected with an inlet of the cartridge valve nine, an outlet of the cartridge valve four is also connected with inlets of the cartridge valve six and the cartridge valve seven, and outlets of the cartridge valve six, the cartridge valve seven and the cartridge valve nine are respectively connected with the oil tank. The small-flow high-pressure pump and the large-flow low-pressure pump are driven by the same servo motor, the outlet of the small-flow high-pressure pump is connected with the main pressure oil way through a first cartridge valve, and the outlet of the large-flow low-pressure pump is connected with the main pressure oil way through a second cartridge valve. The hydraulic system does not have hydraulic impact during conversion, and can meet the requirement of wet pressing and molding of the environment-friendly organic tableware in a hydraulic machine.

Description

Wet-pressing forming servo pump control hydraulic system
Technical Field
The invention relates to a hydraulic machine, in particular to a wet-pressing forming servo pump control hydraulic system, and belongs to the technical field of hydraulic machine tools.
Background
Along with the execution of national all-round plastic forbidden orders, plastic products such as bamboo shoots in spring after raining are replaced, and degradable and recyclable green environment-friendly products can not be produced without a hydraulic master machine. The hydraulic machine on the market at present normally adopts a three-phase asynchronous motor to drive a constant-power variable pump or a servo motor to drive a gear pump as a power source, and is matched with a hydraulic cartridge valve system to realize the operation control of the hydraulic machine. The constant-power variable pump driven by the three-phase asynchronous motor is not rapid enough in speed adjustment, and in addition, the running noise is generally high.
The speed conversion control of the running speed is usually realized by adopting electromagnetic valve switching, the conversion process is relatively harsh, and the impact exists, and if the speed conversion control is carried out by adopting a proportional flow valve, the problem of oil overflow heating exists.
The connection of the full oil pressure driving pipeline is complex, more joints are connected, oil leakage points are easy to cause, oil leakage is easy to occur under the conditions of oil pressure impact and aging of the sealing element used for a long time, and the maintenance workload is large.
The pressure maintaining of a machine tool in the wet-pressing forming process of the environment-friendly organic tableware generally needs 15-30 seconds, and a great deal of energy waste exists when a motor is in a running state all the time. The hydraulic pump station is matched according to the requirement of the running speed of the machine tool, the volume of required oil is 7-10 times of the discharge capacity of an oil pump, and waste of oil in use exists. Under the normal use condition, oil liquid needs to be filtered, decontaminated and replaced every year, and the environment is polluted.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a wet-pressing forming servo pump control hydraulic system, hydraulic impact does not exist in the conversion of working steps, the environment-friendly organic tableware can be subjected to wet-pressing forming in a hydraulic machine, and a finished product can be obtained after high temperature and high pressure.
In order to solve the technical problem, the wet-pressing forming servo pump control hydraulic system comprises a main pressure oil path G1 and a main cylinder 1 connected with a sliding block, wherein the upper cavity of the main cylinder 1 is connected with an oil tank through a hydraulic control liquid filling valve DZ, the main pressure oil path G1 is connected with inlets of a cartridge valve four C4 and a cartridge valve eight C8, and an outlet of the cartridge valve eight C8 is connected with the upper cavity of the main cylinder 1 through a one-way valve one D1; the outlet of cartridge four C4 is connected to the inlet of cartridge five C5 and the outlet of cartridge five C5 is connected to the lower chamber of master cylinder 1.
Compared with the prior art, the invention has the following beneficial effects: when the mold is opened or the sliding block is quickly returned, pressure oil in the main pressure oil path G1 enters a lower cavity of the main cylinder through a cartridge valve four C4 and a cartridge valve five C5; when the cartridge valve four C4 and the cartridge valve five C5 are closed, the slide stops moving upwards. When the sliding block is quickly lowered, the hydraulic control charging valve DZ is sucked, and oil in the oil tank is quickly supplemented into the upper cavity of the main cylinder; when the sliding block is decompressed, the hydraulic control liquid charging valve DZ is opened due to the pressure build-up of the hydraulic control opening, and the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control liquid charging valve DZ.
As an improvement of the invention, the main pressure oil path G1 is also connected with an inlet of a cartridge valve nine C9, an outlet of a cartridge valve four C4 is also connected with inlets of a cartridge valve six C6 and a cartridge valve seven C7, and outlets of a cartridge valve six C6, a cartridge valve seven C7 and a cartridge valve nine C9 are respectively connected with an oil tank. After the cartridge valve nine C9 is closed, the pressure is built in the main pressure oil path G1, and the procedures of quick slide block descending, slide block feeding, accumulator charging, accumulator releasing, mold opening, mold stripping, slide block returning and the like can be carried out; after the cartridge valve nine C9 is opened, the line pressure oil passage G1 is depressurized, and the slider can be held in pressure, stopped, and the like.
As a further improvement of the invention, inlets of a low-flow high-pressure pump P1 and a high-flow low-pressure pump P2 are connected with an oil tank and driven by the same servo motor M1, an outlet of the low-flow high-pressure pump P1 is connected with an inlet of a cartridge valve I C1, an outlet of a high-flow low-pressure pump P2 is connected with inlets of a cartridge valve II C2 and a cartridge valve III C3, outlets of the cartridge valve I C1 and a cartridge valve II C2 are respectively connected with an inlet of a main pressure oil path G1, and an outlet of a cartridge valve III C3 is connected with the oil tank. When the sliding block is quickly lowered, the sliding block is in working feed, the accumulator is filled with liquid, the sliding block is quickly returned and the like, the low-flow high-pressure pump P1 and the high-flow low-pressure pump P2 jointly rotate at 2000 rpm; when the slide block slowly returns, the low-flow high-pressure pump P1 and the high-flow low-pressure pump P2 jointly rotate at the rotating speed of 1000 rpm; when the locking cylinder 2 is operated, the low-flow high-pressure pump P1 independently runs at the speed of 1500 rpm; when the sliding block is decompressed, the low-flow high-pressure pump P1 can independently run at the rotating speed of 1000rpm, and the high-flow low-pressure pump P2 does not work; when the slide block slowly returns, the low-flow high-pressure pump P1 and the high-flow low-pressure pump P2 jointly rotate at the rotating speed of 1000 rpm; when the mold is opened slowly, the low-flow high-pressure pump P1 can independently run at the rotating speed of 400rpm, which is not only beneficial to control, but also can save energy.
As a further improvement of the invention, a hydraulic control port of the hydraulic control prefill valve DZ is connected with a port B of a nine YV9 electromagnetic directional valve through an oil pipe with the caliber of 10mm, a port P of the nine YV9 electromagnetic directional valve is connected with a main pressure oil way G1, and a port T of the nine YV9 electromagnetic directional valve is connected with an oil tank through an independent oil return channel; a hydraulic control port of the cartridge valve eight C8 is connected with a port A of a seven YV7 of the electromagnetic directional valve, a port P of a seven YV7 of the electromagnetic directional valve is connected with a main pressure oil way G1, and a port T of a seven YV7 of the electromagnetic directional valve is connected with an oil tank; the seven YV7 and the nine YV9 are two-position four-way electromagnetic directional valves. When the sliding block is decompressed, the mold is opened, the lower mold is blown, and the electromagnetic directional valve is slowly returned and quickly returned, the nine YV9 is electrified, so that the hydraulic control liquid charging valve DZ is opened due to the pressure build-up of the hydraulic control opening, and the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control liquid charging valve DZ; when the slide block is quickly lowered, the work is advanced, the pressure is maintained, the accumulator is filled with liquid, the upper die is blown, and the locking cylinder acts, the nine YV9 of the electromagnetic directional valve is in a power-off state. When the sliding block is fast lowered or in a working process, the seven YV7 of the electromagnetic directional valve is electrified, the cartridge valve eight C8 is opened due to pressure relief of a hydraulic control port, and pressure oil in the main pressure oil path G1 enters an upper cavity of the main cylinder 1 through the cartridge valve eight C8 and the one-way valve I D1; the processes of pressure maintaining of the sliding block, liquid charging and discharging of the energy accumulator, mold opening, demolding, return stroke, locking and the like are carried out, and the seven YV7 of the electromagnetic directional valve is in a power-off state, so that pressure oil is prevented from entering the upper cavity of the main cylinder. The oil quantity needed by the hydraulic control port of the hydraulic control charging valve DZ is small, an oil pipe with the diameter of 10mm is adopted, oil returns to the oil tank through the independent oil return channel, interference of other large-flow return oil during oil return can be avoided, and the hydraulic control port of the hydraulic control charging valve DZ can be rapidly decompressed.
As a further improvement of the invention, a hydraulic control port of the cartridge valve nine C9 is connected with inlets of a first pressure regulating valve F1 and a second pressure regulating valve F2, inlets of the first pressure regulating valve F1 and the second pressure regulating valve F2 are also connected with a port P of a first electromagnetic reversing valve, an outlet of the first pressure regulating valve F1 is connected with a port B of the first electromagnetic reversing valve, and an outlet of the second pressure regulating valve F2 and a port T of the first electromagnetic reversing valve are both connected with an oil tank; the main pressure oil path G1 is also connected with a hydraulic control port of the cartridge valve nine C9 through a damping pipe with the diameter of 1mm, and the electromagnetic directional valve is a three-position four-way electromagnetic directional valve with the H-shaped middle position function. When the slide block is quickly lowered, the work is advanced, the energy accumulator is charged, the mold is opened, the lower mold is blown, and the slide block is quickly returned, the left coil YV2 of the first electromagnetic directional valve is electrified, the hydraulic control port of the nine C9 of the cartridge valve builds pressure to close the nine C9 of the cartridge valve, the main pressure oil path G1 is controlled by the second pressure regulating valve F2, and the set pressure of the second pressure regulating valve F2 is 0-25 MPa. When the slide block is decompressed and the cylinder is locked to act, the right coil YV1 of the first electromagnetic directional valve is electrified, the main pressure oil path G1 is controlled by a first pressure regulating valve F1, and the actual pressure of the first pressure regulating valve F1 can be set to be 0-8 MPa.
As a further improvement of the invention, a hydraulic control port of the cartridge valve four C4 is connected with a middle outlet of a shuttle valve I S1, a left inlet of the shuttle valve I S1 is connected with an inlet of the cartridge valve five C5, a right inlet of the shuttle valve I S1 is connected with a port A of an electromagnetic directional valve five YV5, a port P of the electromagnetic directional valve five YV5 is connected with a main pressure oil path G1, and a port T of the electromagnetic directional valve five YV5 is connected with an oil tank; a hydraulic control port of the cartridge valve five C5 is connected with a port A of a six YV6 of the electromagnetic directional valve, a port P of the six YV6 of the electromagnetic directional valve is connected with a lower cavity oil way of the main cylinder 1, and a port T of the six YV6 of the electromagnetic directional valve is connected with an oil tank; the lower cavity oil circuit of the master cylinder 1 is also connected with an inlet of a pressure regulating valve five F5, and an outlet of the pressure regulating valve five F5 is connected with an oil tank; five YV5 and six YV6 of the electromagnetic directional valves are two-position four-way electromagnetic directional valves. When the slide block is quickly lowered and is in working progress, the six YV6 of the electromagnetic directional valve is electrified, the five C5 of the cartridge valve is opened due to pressure relief of the hydraulic control port, and the pressure relief of the main cylinder lower cavity is carried out on the oil tank through the five C5 of the cartridge valve and the seven C7 of the cartridge valve; when the pressure of the slide block is maintained, the six YV6 of the electromagnetic directional valve is de-energized, and the five C5 of the cartridge valve is closed. After the environment-friendly organic tableware is extruded and heated in a die for molding, the five YV5 of the electromagnetic directional valve is electrified, the port A is communicated with the port T, the right end of the shuttle valve I S1 loses pressure, pressure oil pushes the cartridge valve IV C4 away, further the cartridge valve V C5 is pushed away, and the pressure oil enters the lower cavity of the main cylinder; the electromagnetic directional valve nine YV9 is electrified, the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control liquid charging valve DZ, the slide block performs slow die opening and lifting actions, then the lower die is blown to separate a product from the lower die 4, and then the slide block slowly returns upwards. When the sliding block stops slowly, the hydraulic pressure in the lower cavity of the main cylinder enables the five cartridge valve C5 to be closed quickly, and meanwhile, the pressure at the left end of the shuttle valve I S1 closes the four cartridge valve C4 quickly, so that series protection is formed, and the sliding block can be prevented from slipping downwards. When the sliding block is quickly returned, the six YV6 of the electromagnetic directional valve is de-energized, the five YV5 of the electromagnetic directional valve is energized, and pressure oil pushes the four C4 and the five C5 of the cartridge valve away to enter the lower cavity of the main cylinder.
As a further improvement of the invention, a pilot control port of the cartridge valve six C6 is connected with a P port of the electromagnetic directional valve four YV4, a pilot control port of the cartridge valve six C6 is also connected with an inlet of the pressure regulating valve four F4 and a pilot control port thereof, an A port of the electromagnetic directional valve four YV4 is connected with an inlet of the pressure regulating valve three F3, and outlets of the pressure regulating valve three F3 and the pressure regulating valve four F4 are respectively connected with an oil tank; a hydraulic control port of the cartridge valve seven C7 is connected with a port A of the electromagnetic directional valve three YV3, a port P of the electromagnetic directional valve three YV3 is connected with an inlet of the cartridge valve seven C7, and a port T is connected with an oil tank; three YV3 and four YV4 of the electromagnetic directional valves are two-position four-way electromagnetic directional valves. When the slide block is quickly lowered, the three YV3 of the electromagnetic directional valve is electrified, and the seven C7 of the cartridge valve is opened due to pressure relief of the hydraulic control port; the six YV6 electromagnetic directional valves are electrified, the five C5 cartridge valve is opened due to pressure relief of a hydraulic control port, and the main cylinder lower cavity is relieved to the oil tank through the five C5 cartridge valve and the seven C7 cartridge valve; the four YV4 of the electromagnetic directional valve is electrified, and the hydraulic control port of the cartridge valve six C6 is controlled by the pressure regulating valve three F3 to close the cartridge valve six C6, so that preparation is made for the slide block to work, and pressure fluctuation during fast downward rotation work is reduced. When the slide block descends to a set switching point position, the three YV3 of the electromagnetic directional valve is de-energized, and the seven C7 of the cartridge valve is closed due to pressure build-up of a hydraulic control port; the supporting force of the lower cavity of the master cylinder is controlled by the pressure regulating valve III F3, and the set pressure of the pressure regulating valve III F3 is 0-8 MPa.
As a further improvement of the invention, a main pressure oil path G1 is connected with an outlet of a cartridge valve deca C10, an inlet of the cartridge valve deca C10 is connected with the bottom of an energy accumulator AC1, a hydraulic control port of the cartridge valve deca C10 is connected with a port A of an electromagnetic directional valve deca YV10, a port P of the electromagnetic directional valve deca YV10 is connected with a middle outlet of a shuttle valve II S2, a left inlet of the shuttle valve II S2 is connected with the bottom of an energy accumulator AC1, a right inlet of the shuttle valve II S2 is connected with a main pressure oil path G1, and a port T of the electromagnetic directional valve deca YV10 is connected with an oil tank; the bottom pipeline of the energy accumulator AC1 is connected with the inlet of the pressure regulating valve seven F7, and the outlet of the pressure regulating valve seven F7 is connected with the oil tank; the electromagnetic directional valve ten YV10 is a two-position four-way electromagnetic directional valve. The environment-friendly organic tableware needs longer pressure maintaining time, the electromagnetic directional valve deca YV10 is powered on by utilizing the pressure maintaining time, the cartridge valve deca C10 is opened due to pressure relief of the hydraulic control port, pressure oil enters the energy accumulator AC1 for liquid filling, the liquid filling is stopped after the liquid filling time is up, and the working efficiency is improved. When the sliding block returns rapidly, the electromagnetic directional valve ten YV10 is electrified, the cartridge valve ten C10 is opened, pressure oil in the energy accumulator AC1 is released, and the return speed and the working efficiency are improved.
As a further improvement of the invention, a hydraulic control port of the cartridge valve three C3 is connected with a port B of an electromagnetic directional valve eight YV8, and a port T of the electromagnetic directional valve eight YV8 is connected with an oil tank; the hydraulic control port of the cartridge valve III C3 is also connected with the inlet of the pressure regulating valve VI F6 and the hydraulic control port thereof, the outlet of the pressure regulating valve VI F6 is connected with an oil tank, and the electromagnetic directional valve eight YV8 is a two-position four-way electromagnetic directional valve. When the sliding block is fast lowered, the sliding block is in working feeding, the energy accumulator is filled with liquid, and the sliding block returns, the electromagnetic reversing valve eight YV8 is electrified, the cartridge valve three C3 is closed due to pressure build of a hydraulic control port, hydraulic oil at the outlet of the high-flow low-pressure pump P2 enters the main pressure oil path G1 through the cartridge valve two C2 and works together with the low-flow high-pressure pump P1. When the sliding block operates to close the upper die and the lower die, the upper cavity of the main cylinder starts to be pressurized, when the pressure of the upper cavity of the main cylinder reaches 8MPa, the electromagnetic directional valve eight YV8 is de-energized, the high-flow low-pressure pump P2 overflows through the cartridge valve three C3, oil is continuously supplied by the low-flow high-pressure pump P1 at the moment, high pressure can be built in the upper cavity of the main cylinder, and the rotating speed of the servo motor M1 is 2000 rpm. When the slide block is subjected to pressure maintaining, pressure relief, mold opening, demolding and locking, the electromagnetic reversing valve eight YV8 is de-energized, the high-flow low-pressure pump P2 overflows, and the low-flow high-pressure pump P1 independently works to save energy.
As a further improvement of the invention, the outlet of the low-flow high-pressure pump P1 is also connected with the port P of the electromagnetic directional valve eleven through an oil pipe with the caliber of 6mm, the port A of the electromagnetic directional valve eleven is connected with the inlet of the hydraulic control one-way valve three D3 and the hydraulic control port of the hydraulic control one-way valve two D2, and the outlet of the hydraulic control one-way valve three D3 is connected with the rod cavity of the locking cylinder 2; a port B of the eleventh electromagnetic reversing valve is connected with an inlet of a second hydraulic control one-way valve D2 and a hydraulic control port of a third hydraulic control one-way valve D3, an outlet of the second hydraulic control one-way valve D2 is connected with a plug cavity of the locking cylinder 2, and a port T of the eleventh electromagnetic reversing valve is connected with an oil tank through an independent oil return channel; the electromagnetic directional valve eleven is a three-position four-way electromagnetic directional valve with a Y-shaped median function. After the sliding block returns to the top, a left coil YV12 of the electromagnetic directional valve eleven is electrified, a port P is communicated with a port B, a port A is communicated with a port T, pressure oil enters a plug cavity of the locking cylinder 2, a rod cavity of the locking cylinder 2 returns oil to an oil tank, the locking pin extends out, the sliding block is locked at a top dead center, and the sliding block can enter a die changing or die repairing work. The right coil YV11 of the electromagnetic directional valve eleven is electrified, the port P is communicated with the port A, the port B is communicated with the port T, pressure oil enters the rod cavity of the locking cylinder 2, the plug cavity of the locking cylinder 2 returns oil to the oil tank, the locking pin is withdrawn, the sliding block is unlocked, and the electromagnetic directional valve eleven is continuously put into operation. The oil quantity that locking cylinder 2 needs is little, adopts the oil pipe of 6mm bore, adopts independent oil return passageway to the oil tank oil return, can avoid receiving the interference of other large-traffic oil returns during the oil return, guarantees that the action of locking cylinder 2 is sensitive timely, avoids the fitting pin out of work because the backpressure produces the removal, improves the security of hydraulic press.
As a further improvement of the invention, the air source pipe G2 is connected with the P ports of a first pneumatic solenoid valve YA1 and a second pneumatic solenoid valve YA2 through a filtering and reducing valve 5, the T ports of the first pneumatic solenoid valve YA1 and the second pneumatic solenoid valve YA2 are respectively communicated with the atmosphere through a silencer, the A port of the first pneumatic solenoid valve YA1 is connected with the lower die blowing manifold G4 through a four-way valve D4, and the A port of the second pneumatic solenoid valve YA2 is connected with the upper die blowing manifold G3 through a five-way valve D5. The environment-friendly organic tableware is heated and molded in a die of a hydraulic press, after the die is opened, the product is still in a very soft state and is attached to the die, and the product is demoulded by adopting compressed air, so that defects caused by collision of the product can be avoided, and the cooling and shaping of the product can be accelerated. After the mold is opened, the pneumatic electromagnetic valve YA1 is electrified, compressed air enters the lower mold blowing header pipe G4 and blows upwards from each lower mold blowing hole of the lower mold 4 to separate a product from the lower mold 4, and blowing is stopped when blowing time is up. After the slide block is lifted by 50mm, the pneumatic electromagnetic valve YA2 is electrified, compressed air enters the upper die blowing header pipe G3 and is blown downwards from each upper die blowing hole of the upper die 3, so that a product is separated from the upper die 3, the product is prevented from being blown away, and blowing is stopped when blowing time is up; the product falls on the lower mould, and the material robot of being convenient for get the material.
As a further improvement of the invention, the working process comprises the following steps: the low-flow high-pressure pump P1 operates independently, and the rotating speed of the servo motor M1 is 400 rpm; when the electromagnetic directional valve five YV5 is electrified, pressure oil pushes the cartridge valve four C4 open, the cartridge valve five C5 open, and the pressure oil enters the lower cavity of the main cylinder; the electromagnetic directional valve nine YV9 is electrified, the upper cavity of the main cylinder releases pressure to the oil tank through the hydraulic control liquid charging valve DZ, and the slide block performs slow die opening and lifting actions; then the pneumatic electromagnetic valve YA1 is electrified, compressed air enters the lower die blowing header pipe G4 and is blown upwards from each lower die blowing hole of the lower die 4, so that a product is separated from the lower die 4, and blowing is stopped when blowing time is up; and then, stopping after the slide block slowly returns upwards by 50mm, electrifying a pneumatic electromagnetic valve YA2, introducing compressed air into an upper die blowing manifold G3, blowing downwards from each upper die blowing hole of the upper die 3 to separate the product from the upper die 3, and stopping blowing when blowing time is up. The environment-friendly organic tableware is very soft after being extruded and heated in the die of the hydraulic press and is still adhered to the surface of the die; the invention adopts the independent low-speed operation of the low-flow high-pressure pump P1, so that the upper die 3 is slightly lifted off the lower die 4 at a very slow speed, the height can be limited within 10mm, the product is prevented from being torn, and the product is prevented from deforming before shaping. The invention adopts the sequence of firstly removing the lower die 4 and then removing the upper die 3, thereby ensuring that the environment-friendly organic tableware which is just thermoformed can be smoothly demoulded.
Drawings
The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.
FIG. 1 is a hydraulic schematic diagram of a wet-pressing servo pump-controlled hydraulic system of the present invention.
FIG. 2 is a drawing of a mold stripping and blowing system for upper and lower molds according to the present invention.
In the figure: 1. a master cylinder; 2. a locking cylinder; 3. an upper die; 4. a lower die; 5. a filtering pressure reducing valve; G1. a main pressure oil path; G2. a gas source pipe; G3. an upper die blowing main pipe; G4. a lower die blowing header pipe; p1, a low-flow high-pressure pump; p2, a high-flow low-pressure pump; m1, a servo motor; DZ. liquid-controlled charging valve; D1. a one-way valve I; D2. a second hydraulic control one-way valve; D3. a hydraulic control one-way valve III; D4. a one-way valve IV; D5. a one-way valve V; C1. first cartridge … … C10. tenth cartridge; YV1/YV2, first electromagnetic directional valve; yv3. electromagnetic directional valve iii … … yv10 electromagnetic directional valve ten; YV11/YV12. electromagnetic directional valve eleven; YA1, a first pneumatic electromagnetic valve; YA2, a pneumatic electromagnetic valve II; s1, a first shuttle valve; s2, a second shuttle valve; F1. the first pressure regulating valve … … F7. is a seventh pressure regulating valve; F8. a remote manual pressure regulating valve eighth; ac1. an accumulator; CP1, a first pressure sensor; CP2, a pressure sensor II; YAA remote electrohydraulic relief valve.
Detailed Description
As shown in fig. 1, the wet-pressing forming servo pump control hydraulic system of the invention comprises a main pressure oil path G1 and a main cylinder 1 connected with a slide block, wherein the upper cavity of the main cylinder 1 is connected with an oil tank through a hydraulic control charging valve DZ, the main pressure oil path G1 is connected with the inlets of a cartridge valve four C4 and a cartridge valve eight C8, and the outlet of the cartridge valve eight C8 is connected with the upper cavity of the main cylinder 1 through a one-way valve one D1; the outlet of cartridge four C4 is connected to the inlet of cartridge five C5 and the outlet of cartridge five C5 is connected to the lower chamber of master cylinder 1. When the mold is opened or the sliding block is quickly returned, pressure oil in the main pressure oil path G1 enters a lower cavity of the main cylinder through a cartridge valve four C4 and a cartridge valve five C5; when the cartridge valve four C4 and the cartridge valve five C5 are closed, the slide stops moving upwards. When the sliding block is quickly lowered, the hydraulic control charging valve DZ is sucked, and oil in the oil tank is quickly supplemented into the upper cavity of the main cylinder; when the sliding block is decompressed, the hydraulic control liquid charging valve DZ is opened due to the pressure build-up of the hydraulic control opening, and the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control liquid charging valve DZ.
The main pressure oil path G1 is also connected with an inlet of a cartridge valve nine C9, an outlet of a cartridge valve four C4 is also connected with inlets of a cartridge valve six C6 and a cartridge valve seven C7, and outlets of the cartridge valve six C6, the cartridge valve seven C7 and the cartridge valve nine C9 are respectively connected with an oil tank. After the cartridge valve nine C9 is closed, the pressure is built in the main pressure oil path G1, and the procedures of quick slide block descending, slide block feeding, accumulator charging, accumulator releasing, mold opening, mold stripping, slide block returning and the like can be carried out; after the cartridge valve nine C9 is opened, the line pressure oil passage G1 is depressurized, and the slider can be held in pressure, stopped, and the like.
Inlets of a small-flow high-pressure pump P1 and a large-flow low-pressure pump P2 are connected with an oil tank and driven by the same servo motor M1, an outlet of the small-flow high-pressure pump P1 is connected with an inlet of a first cartridge valve C1, an outlet of a large-flow low-pressure pump P2 is connected with inlets of a second cartridge valve C2 and a third cartridge valve C3, outlets of the first cartridge valve C1 and the second cartridge valve C2 are respectively connected with an inlet of a main pressure oil path G1, and an outlet of a third cartridge valve C3 is connected with the oil tank. When the sliding block is quickly lowered, the sliding block is in working feed, the accumulator is filled with liquid, the sliding block is quickly returned and the like, the low-flow high-pressure pump P1 and the high-flow low-pressure pump P2 jointly rotate at 2000 rpm; when the slide block slowly returns, the low-flow high-pressure pump P1 and the high-flow low-pressure pump P2 jointly rotate at the rotating speed of 1000 rpm; when the locking cylinder 2 is operated, the low-flow high-pressure pump P1 independently runs at the speed of 1500 rpm; when the sliding block is decompressed, the low-flow high-pressure pump P1 can independently run at the rotating speed of 1000rpm, and the high-flow low-pressure pump P2 does not work; when the slide block slowly returns, the low-flow high-pressure pump P1 and the high-flow low-pressure pump P2 jointly rotate at the rotating speed of 1000 rpm; when the mold is opened slowly, the low-flow high-pressure pump P1 can independently run at the rotating speed of 400rpm, which is not only beneficial to control, but also can save energy.
A hydraulic control port of the hydraulic control charging valve DZ is connected with a port B of a nine YV9 electromagnetic directional valve through an oil pipe with the caliber of 10mm, a port P of the nine YV9 electromagnetic directional valve is connected with a main pressure oil way G1, and a port T of the nine YV9 electromagnetic directional valve is connected with an oil tank through an independent oil return channel; a hydraulic control port of the cartridge valve eight C8 is connected with a port A of a seven YV7 of the electromagnetic directional valve, a port P of a seven YV7 of the electromagnetic directional valve is connected with a main pressure oil way G1, and a port T of a seven YV7 of the electromagnetic directional valve is connected with an oil tank; the seven YV7 and the nine YV9 are two-position four-way electromagnetic directional valves.
When the sliding block is decompressed, the mold is opened, the lower mold is blown, and the electromagnetic directional valve is slowly returned and quickly returned, the nine YV9 is electrified, so that the hydraulic control liquid charging valve DZ is opened due to the pressure build-up of the hydraulic control opening, and the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control liquid charging valve DZ; when the slide block is quickly lowered, the work is advanced, the pressure is maintained, the accumulator is filled with liquid, the upper die is blown, and the locking cylinder acts, the nine YV9 of the electromagnetic directional valve is in a power-off state. When the sliding block is fast lowered or in a working process, the seven YV7 of the electromagnetic directional valve is electrified, the cartridge valve eight C8 is opened due to pressure relief of a hydraulic control port, and pressure oil in the main pressure oil path G1 enters an upper cavity of the main cylinder 1 through the cartridge valve eight C8 and the one-way valve I D1; the processes of pressure maintaining of the sliding block, liquid charging and discharging of the energy accumulator, mold opening, demolding, return stroke, locking and the like are carried out, and the seven YV7 of the electromagnetic directional valve is in a power-off state, so that pressure oil is prevented from entering the upper cavity of the main cylinder. The oil quantity needed by the hydraulic control port of the hydraulic control charging valve DZ is small, an oil pipe with the diameter of 10mm is adopted, oil returns to the oil tank through the independent oil return channel, interference of other large-flow return oil during oil return can be avoided, and the hydraulic control port of the hydraulic control charging valve DZ can be rapidly decompressed.
The hydraulic control port of the cartridge valve nine C9 is connected with inlets of a first pressure regulating valve F1 and a second pressure regulating valve F2, the inlets of the first pressure regulating valve F1 and the second pressure regulating valve F2 are also connected with a port P of a first electromagnetic reversing valve, the outlet of the first pressure regulating valve F1 is connected with a port B of the first electromagnetic reversing valve, and the outlet of the second pressure regulating valve F2 and the port T of the first electromagnetic reversing valve are connected with an oil tank; the main pressure oil path G1 is also connected with a hydraulic control port of the cartridge valve nine C9 through a damping pipe with the diameter of 1mm, and the electromagnetic directional valve is a three-position four-way electromagnetic directional valve with the H-shaped middle position function. When the slide block is quickly lowered, the work is advanced, the energy accumulator is charged, the mold is opened, the lower mold is blown, and the slide block is quickly returned, the left coil YV2 of the first electromagnetic directional valve is electrified, the hydraulic control port of the nine C9 of the cartridge valve builds pressure to close the nine C9 of the cartridge valve, the main pressure oil path G1 is controlled by the second pressure regulating valve F2, and the set pressure of the second pressure regulating valve F2 is 0-25 MPa. When the slide block is decompressed and the cylinder is locked to act, the right coil YV1 of the first electromagnetic directional valve is electrified, the main pressure oil path G1 is controlled by a first pressure regulating valve F1, and the actual pressure of the first pressure regulating valve F1 can be set to be 0-8 MPa. The hydraulic control port of the cartridge valve nine C9 is also connected with a remote electro-hydraulic overflow valve YAA and a remote manual pressure regulating valve eight F8, so that remote pressure regulation of a main pressure oil path G1 is realized.
A hydraulic control port of the cartridge valve four C4 is connected with a middle outlet of a shuttle valve I S1, a left inlet of the shuttle valve I S1 is connected with an inlet of the cartridge valve five C5, a right inlet of the shuttle valve I S1 is connected with a port A of an electromagnetic directional valve five YV5, a port P of the electromagnetic directional valve five YV5 is connected with a main pressure oil path G1, and a port T of the electromagnetic directional valve five YV5 is connected with an oil tank; a hydraulic control port of the cartridge valve five C5 is connected with a port A of a six YV6 of the electromagnetic directional valve, a port P of the six YV6 of the electromagnetic directional valve is connected with a lower cavity oil way of the main cylinder 1, and a port T of the six YV6 of the electromagnetic directional valve is connected with an oil tank; the lower cavity oil circuit of the master cylinder 1 is also connected with an inlet of a pressure regulating valve five F5, and an outlet of the pressure regulating valve five F5 is connected with an oil tank; five YV5 and six YV6 of the electromagnetic directional valves are two-position four-way electromagnetic directional valves.
When the slide block is quickly lowered and is in working progress, the six YV6 of the electromagnetic directional valve is electrified, the five C5 of the cartridge valve is opened due to pressure relief of the hydraulic control port, and the pressure relief of the main cylinder lower cavity is carried out on the oil tank through the five C5 of the cartridge valve and the seven C7 of the cartridge valve; when the pressure of the slide block is maintained, the six YV6 of the electromagnetic directional valve is de-energized, and the five C5 of the cartridge valve is closed. After the environment-friendly organic tableware is extruded and heated in a die for molding, the five YV5 of the electromagnetic directional valve is electrified, the port A is communicated with the port T, the right end of the shuttle valve I S1 loses pressure, pressure oil pushes the cartridge valve IV C4 away, further the cartridge valve V C5 is pushed away, and the pressure oil enters the lower cavity of the main cylinder; the electromagnetic directional valve nine YV9 is electrified, the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control liquid charging valve DZ, the slide block performs slow die opening and lifting actions, then the lower die is blown to separate a product from the lower die 4, and then the slide block slowly returns upwards. When the sliding block stops slowly, the hydraulic pressure in the lower cavity of the main cylinder enables the five cartridge valve C5 to be closed quickly, and meanwhile, the pressure at the left end of the shuttle valve I S1 closes the four cartridge valve C4 quickly, so that series protection is formed, and the sliding block can be prevented from slipping downwards. When the sliding block is quickly returned, the six YV6 of the electromagnetic directional valve is de-energized, the five YV5 of the electromagnetic directional valve is energized, and pressure oil pushes the four C4 and the five C5 of the cartridge valve away to enter the lower cavity of the main cylinder. The pressure of the lower cavity of the main cylinder is monitored by a second pressure sensor CP2, the oil circuit of the lower cavity of the main cylinder is also connected with the inlet of a five pressure regulating valve F5, the outlet of the five pressure regulating valve F5 is connected with an oil tank, and the set pressure is 0-25 MPa.
The hydraulic control port of the cartridge valve six C6 is connected with the P port of the electromagnetic directional valve four YV4, the hydraulic control port of the cartridge valve six C6 is also connected with the inlet of the pressure regulating valve four F4 and the hydraulic control port thereof, the A port of the electromagnetic directional valve four YV4 is connected with the inlet of the pressure regulating valve three F3, and the outlets of the pressure regulating valve three F3 and the pressure regulating valve four F4 are respectively connected with the oil tank; a hydraulic control port of the cartridge valve seven C7 is connected with a port A of the electromagnetic directional valve three YV3, a port P of the electromagnetic directional valve three YV3 is connected with an inlet of the cartridge valve seven C7, and a port T is connected with an oil tank; three YV3 and four YV4 of the electromagnetic directional valves are two-position four-way electromagnetic directional valves.
When the slide block is quickly lowered, the three YV3 of the electromagnetic directional valve is electrified, and the seven C7 of the cartridge valve is opened due to pressure relief of the hydraulic control port; the six YV6 electromagnetic directional valves are electrified, the five C5 cartridge valve is opened due to pressure relief of a hydraulic control port, and the main cylinder lower cavity is relieved to the oil tank through the five C5 cartridge valve and the seven C7 cartridge valve; the four YV4 of the electromagnetic directional valve is electrified, and the hydraulic control port of the cartridge valve six C6 is controlled by the pressure regulating valve three F3 to close the cartridge valve six C6, so that preparation is made for the slide block to work, and pressure fluctuation during fast downward rotation work is reduced. When the slide block descends to a set switching point position, the three YV3 of the electromagnetic directional valve is de-energized, and the seven C7 of the cartridge valve is closed due to pressure build-up of a hydraulic control port; the supporting force of the lower cavity of the master cylinder is controlled by the pressure regulating valve III F3, and the set pressure of the pressure regulating valve III F3 is 0-8 MPa.
The main pressure oil path G1 is connected with an outlet of the cartridge valve deca C10, an inlet of the cartridge valve deca C10 is connected with the bottom of an energy accumulator AC1, a hydraulic control port of the cartridge valve deca C10 is connected with a port A of an electromagnetic directional valve deca YV10, a port P of the electromagnetic directional valve deca YV10 is connected with a middle outlet of a second shuttle valve S2, a left inlet of the second shuttle valve S2 is connected with the bottom of the energy accumulator AC1, a right inlet of the second shuttle valve S2 is connected with the main pressure oil path G1, and a port T of the electromagnetic directional valve deca YV10 is connected with an oil tank; the bottom pipeline of the energy accumulator AC1 is connected with the inlet of the pressure regulating valve seven F7, and the outlet of the pressure regulating valve seven F7 is connected with the oil tank; the electromagnetic directional valve ten YV10 is a two-position four-way electromagnetic directional valve. The environment-friendly organic tableware needs longer pressure maintaining time, the electromagnetic directional valve deca YV10 is powered on by utilizing the pressure maintaining time, the cartridge valve deca C10 is opened due to pressure relief of the hydraulic control port, pressure oil enters the energy accumulator AC1 for liquid filling, the liquid filling is stopped after the liquid filling time is up, and the working efficiency is improved. When the sliding block returns rapidly, the electromagnetic directional valve ten YV10 is electrified, the cartridge valve ten C10 is opened, pressure oil in the energy accumulator AC1 is released, and the return speed and the working efficiency are improved.
A hydraulic control port of the cartridge valve III C3 is connected with a port B of an electromagnetic directional valve eight YV8, and a port T of the electromagnetic directional valve eight YV8 is connected with an oil tank; the hydraulic control port of the cartridge valve III C3 is also connected with the inlet of the pressure regulating valve VI F6 and the hydraulic control port thereof, the outlet of the pressure regulating valve VI F6 is connected with an oil tank, and the electromagnetic directional valve eight YV8 is a two-position four-way electromagnetic directional valve. When the sliding block is fast lowered, the sliding block is in working feeding, the energy accumulator is filled with liquid, and the sliding block returns, the electromagnetic reversing valve eight YV8 is electrified, the cartridge valve three C3 is closed due to pressure build of a hydraulic control port, hydraulic oil at the outlet of the high-flow low-pressure pump P2 enters the main pressure oil path G1 through the cartridge valve two C2 and works together with the low-flow high-pressure pump P1. When the sliding block operates to close the upper die and the lower die, the upper cavity of the main cylinder starts to be pressurized, when the pressure of the upper cavity of the main cylinder reaches 8MPa, the electromagnetic directional valve eight YV8 is de-energized, the high-flow low-pressure pump P2 overflows through the cartridge valve three C3, oil is continuously supplied by the low-flow high-pressure pump P1 at the moment, high pressure can be built in the upper cavity of the main cylinder, and the rotating speed of the servo motor M1 is 2000 rpm. When the slide block is subjected to pressure maintaining, pressure relief, mold opening, demolding and locking, the electromagnetic reversing valve eight YV8 is de-energized, the high-flow low-pressure pump P2 overflows, and the low-flow high-pressure pump P1 independently works to save energy.
The outlet of the low-flow high-pressure pump P1 is also connected with the port P of the electromagnetic directional valve eleven through an oil pipe with the diameter of 6mm, the port A of the electromagnetic directional valve eleven is connected with the inlet of the hydraulic control one-way valve III D3 and the hydraulic control port of the hydraulic control one-way valve II D2, and the outlet of the hydraulic control one-way valve III D3 is connected with the rod cavity of the locking cylinder 2; a port B of the eleventh electromagnetic reversing valve is connected with an inlet of a second hydraulic control one-way valve D2 and a hydraulic control port of a third hydraulic control one-way valve D3, an outlet of the second hydraulic control one-way valve D2 is connected with a plug cavity of the locking cylinder 2, and a port T of the eleventh electromagnetic reversing valve is connected with an oil tank through an independent oil return channel; the electromagnetic directional valve eleven is a three-position four-way electromagnetic directional valve with a Y-shaped median function. After the sliding block returns to the top, a left coil YV12 of the electromagnetic directional valve eleven is electrified, a port P is communicated with a port B, a port A is communicated with a port T, pressure oil enters a plug cavity of the locking cylinder 2, a rod cavity of the locking cylinder 2 returns oil to an oil tank, the locking pin extends out, the sliding block is locked at a top dead center, and the sliding block can enter a die changing or die repairing work. The right coil YV11 of the electromagnetic directional valve eleven is electrified, the port P is communicated with the port A, the port B is communicated with the port T, pressure oil enters the rod cavity of the locking cylinder 2, the plug cavity of the locking cylinder 2 returns oil to the oil tank, the locking pin is withdrawn, the sliding block is unlocked, and the electromagnetic directional valve eleven is continuously put into operation. The oil quantity that locking cylinder 2 needs is little, adopts the oil pipe of 6mm bore, adopts independent oil return passageway to the oil tank oil return, can avoid receiving the interference of other large-traffic oil returns during the oil return, guarantees that the action of locking cylinder 2 is sensitive timely, avoids the fitting pin out of work because the backpressure produces the removal, improves the security of hydraulic press.
As shown in fig. 2, the air source pipe G2 is connected to the P ports of the pneumatic solenoid valve YA1 and the pneumatic solenoid valve YA2 through the filtering and pressure reducing valve 5, the T ports of the pneumatic solenoid valve YA1 and the pneumatic solenoid valve YA2 are respectively communicated to the atmosphere through the muffler, the port a of the pneumatic solenoid valve YA1 is connected to the lower mold blowing manifold G4 through the check valve four D4, and the port a of the pneumatic solenoid valve YA2 is connected to the upper mold blowing manifold G3 through the check valve five D5. The environment-friendly organic tableware is heated and molded in a die of a hydraulic press, after the die is opened, the product is still in a very soft state and is attached to the die, and the product is demoulded by adopting compressed air, so that defects caused by collision of the product can be avoided, and the cooling and shaping of the product can be accelerated. After the mold is opened, the pneumatic electromagnetic valve YA1 is electrified, compressed air enters the lower mold blowing header pipe G4 and blows upwards from each lower mold blowing hole of the lower mold 4 to separate a product from the lower mold 4, and blowing is stopped when blowing time is up. After the slide block is lifted by 50mm, the pneumatic electromagnetic valve YA2 is electrified, compressed air enters the upper die blowing header pipe G3 and is blown downwards from each upper die blowing hole of the upper die 3, so that a product is separated from the upper die 3, the product is prevented from being blown away, and blowing is stopped when blowing time is up; the product falls on the lower mould, and the material robot of being convenient for get the material.
The working cycle steps of the hydraulic press when processing the wet-pressed formed product are as follows: firstly, quickly sliding a sliding block: hydraulic oil at the outlet of the low-flow high-pressure pump P1 enters a main pressure oil path G1 through a cartridge valve I C1; the electromagnetic directional valve eight YV8 is electrified, the cartridge valve three C3 is closed due to pressure build-up of a hydraulic control port, and hydraulic oil at the outlet of the high-flow low-pressure pump P2 enters a main pressure oil path G1 through the cartridge valve two C2; the rotation speed of the servomotor M1 was 2000 rpm.
A left coil YV2 of the first electromagnetic directional valve is electrified, the hydraulic control port of the cartridge valve nine C9 builds pressure to close the cartridge valve nine C9 and is controlled by a second pressure regulating valve F2, and the set pressure of the second pressure regulating valve F2 is 0-25 MPa; the electromagnetic directional valve seven YV7 is electrified, the cartridge valve eight C8 is opened due to pressure relief of a hydraulic control port, and pressure oil in the main pressure oil path G1 enters an upper cavity of the main cylinder 1 through the cartridge valve eight C8 and the one-way valve one D1; the hydraulic control charging valve DZ is sucked, and oil in the oil tank is rapidly supplemented into the upper cavity of the main cylinder; the three YV3 of the electromagnetic directional valve is electrified, and the seven C7 of the cartridge valve is opened due to the pressure relief of the hydraulic control port; the six YV6 electromagnetic directional valves are electrified, the five C5 cartridge valve is opened due to pressure relief of a hydraulic control port, and the main cylinder lower cavity is relieved to the oil tank through the five C5 cartridge valve and the seven C7 cartridge valve; the four YV4 of the electromagnetic directional valve is electrified, and the hydraulic control port of the cartridge valve six C6 is controlled by the pressure regulating valve three F3 to close the cartridge valve six C6, so that preparation is made for the slide block to work, and pressure fluctuation during fast downward rotation work is reduced.
The sliding block is operated: when the slide block descends to a set switching point position, the three YV3 of the electromagnetic directional valve is de-energized, and the seven C7 of the cartridge valve is closed due to pressure build-up of a hydraulic control port; the supporting force of the lower cavity of the master cylinder is controlled by the pressure regulating valve III F3, and the set pressure of the pressure regulating valve III F3 is 0-8 MPa;
when the sliding block operates to close the upper die and the lower die, the upper cavity of the main cylinder starts to be pressurized, when the pressure of the upper cavity of the main cylinder reaches 8MPa, the electromagnetic directional valve eight YV8 is de-energized, the high-flow low-pressure pump P2 overflows through the cartridge valve three C3, oil is continuously supplied by the low-flow high-pressure pump P1 at the moment, high pressure can be built in the upper cavity of the main cylinder, and the rotating speed of the servo motor M1 is 2000 rpm.
Pressure maintaining of the sliding block: after the upper cavity of the main cylinder reaches the set pressure of 13MPa, a pressure sensor CP1 sends a signal, all the electromagnetic directional valves are all powered off, the slide block enters the pressure maintaining state, and the low-flow high-pressure pump P1 also stops running.
Fourthly, charging the energy accumulator: the electromagnetic directional valve eight YV8 is electrified, the high-flow low-pressure pump P2 and the low-flow high-pressure pump P1 are jointly put into work, the rotating speed of the servo motor M1 is 2000rpm, and the pressure of a main pressure oil way G1 is built; a left coil YV2 of the first electromagnetic directional valve is electrified, and the cartridge valve nine C9 is closed and controlled by a pressure regulating valve II F2; the electromagnetic directional valve ten YV10 is electrified, the cartridge valve ten C10 is opened due to pressure relief of a hydraulic control port, pressure oil enters the energy accumulator AC1 for charging, and charging is stopped when charging time is up.
Pressure relief of the sliding block: a right coil YV1 of the first electromagnetic directional valve is electrified, a hydraulic control port of the cartridge valve nine C9 is controlled by a pressure regulating valve F1, and the set pressure of the pressure regulating valve F1 is 0-8 MPa; the electromagnetic directional valve deca YV10 is de-energized, and the cartridge valve deca C10 is closed due to the pressure build-up of the hydraulic control port; the electromagnetic directional valve eight YV8 loses power, the high-flow low-pressure pump P2 overflows, the low-flow high-pressure pump P1 works independently, and the rotating speed of the servo motor M1 is 1000 rpm; the electromagnetic directional valve nine YV9 is electrified, so that the hydraulic control charging valve DZ is opened due to the pressure build-up of the hydraulic control port, and the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control charging valve DZ.
Sixthly, slowly opening the die: the sliding block is decompressed and delays to send a signal, and the rotating speed of the servo motor M1 is reduced to 400 rpm; a left coil YV2 of the first electromagnetic directional valve is electrified, a hydraulic control port of the cartridge valve nine C9 builds pressure to close the cartridge valve nine C9, and the pressure is controlled by a pressure regulating valve II F2; the five YV5 of the electromagnetic directional valve is electrified, the port A is communicated with the port T, the right end of the shuttle valve I S1 loses pressure, pressure oil pushes the cartridge valve IV C4 open, the cartridge valve V C5 open, and the pressure oil enters the lower cavity of the main cylinder; the electromagnetic directional valve nine YV9 is electrified, the upper cavity of the main cylinder releases pressure to the oil tank through the hydraulic control liquid charging valve DZ, and the slide block performs slow die opening and lifting actions.
Lower die blowing: when the pneumatic electromagnetic valve YA1 is electrified, compressed air enters the lower die blowing manifold G4 and blows upwards from each lower die blowing hole of the lower die 4 to separate a product from the lower die 4, and blowing is stopped when blowing time is up.
Slider slow-back: the electromagnetic directional valve eight YV8 is electrified, the high-flow low-pressure pump P2 and the low-flow high-pressure pump P1 are jointly put into work, the rotating speed of the servo motor M1 is 1000rpm, and the sliding block slowly returns.
Slow return of the self-stain: when the slide block slowly returns to a set position, for example, 50mm, all the electromagnetic directional valves lose power, and the servo motor M1 stops running; the hydraulic pressure in the lower chamber of the master cylinder rapidly closes the fifth cartridge valve C5, and the pressure at the left end of the first shuttle valve S1 rapidly closes the fourth cartridge valve C4, thereby preventing the slide from slipping downward.
The utility model has the advantages that the upper die is blown: when the pneumatic electromagnetic valve II YA2 is electrified, compressed air enters the upper die blowing manifold G3 and blows downwards from each upper die blowing hole of the upper die 3 to separate a product from the upper die 3, and blowing is stopped when blowing time is up.
The sliding block is fast to return: a left coil YV2 of the first electromagnetic directional valve is electrified, and the cartridge valve nine C9 is closed and controlled by a pressure regulating valve II F2; the five YV5 of the electromagnetic directional valve is electrified, and pressure oil pushes the four cartridge valve C4 and the five cartridge valve C5 away to enter a lower cavity of the master cylinder; the electromagnetic directional valve eight YV8 is electrified, the high-flow low-pressure pump P2 and the low-flow high-pressure pump P1 are jointly put into work, and the rotating speed of the servo motor M1 is 2000 rpm; the electromagnetic directional valve nine YV9 is electrified, the upper cavity of the main cylinder is decompressed to the oil tank through the hydraulic control liquid charging valve DZ, and the slide block returns quickly; the electromagnetic directional valve ten YV10 is electrified, the cartridge valve ten C10 is opened, the pressure oil in the energy accumulator AC1 is released, and the return speed and the working efficiency are improved.
Lifting out a water pumping locking cylinder: a left coil YV12 of the eleventh electromagnetic directional valve is electrified, a port P is communicated with a port B, a port A is communicated with a port T, pressure oil enters a plug cavity of the locking cylinder 2, a rod cavity of the locking cylinder 2 returns oil to an oil tank, and the sliding block is locked at a top dead center; meanwhile, the right coil YV1 of the first electromagnetic directional valve is electrified, and the pressure of the main pressure oil path G1 is controlled by the first pressure regulating valve F1; the low-flow high-pressure pump P1 operates independently at 1500 rpm.
The selection locking cylinder returns: a right coil YV11 of the eleventh electromagnetic directional valve is electrified, a port P is communicated with a port A, a port B is communicated with a port T, pressure oil enters a rod cavity of the locking cylinder 2, a plug cavity of the locking cylinder 2 returns oil to an oil tank, and the sliding block is unlocked.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.

Claims (12)

1. The utility model provides a wet-pressing shaping servo pump accuse hydraulic system, includes main pressure oil circuit (G1) and master cylinder (1) that links to each other with the slider, its characterized in that: the upper cavity of the main cylinder (1) is connected with an oil tank through a hydraulic control liquid charging valve (DZ), a main pressure oil path (G1) is connected with inlets of a cartridge valve four (C4) and a cartridge valve eight (C8), and an outlet of the cartridge valve eight (C8) is connected with the upper cavity of the main cylinder (1) through a one-way valve one (D1); the outlet of cartridge valve four (C4) is connected to the inlet of cartridge valve five (C5), and the outlet of cartridge valve five (C5) is connected to the lower chamber of the master cylinder (1).
2. The wet-briquetting servo-pump-controlled hydraulic system of claim 1, wherein: the main pressure oil path (G1) is also connected with an inlet of a cartridge valve nine (C9), an outlet of a cartridge valve four (C4) is also connected with inlets of a cartridge valve six (C6) and a cartridge valve seven (C7), and outlets of the cartridge valve six (C6), the cartridge valve seven (C7) and the cartridge valve nine (C9) are respectively connected with an oil tank.
3. The wet-briquetting servo-pump-controlled hydraulic system of claim 1, wherein: inlets of a small-flow high-pressure pump (P1) and a large-flow low-pressure pump (P2) are connected with an oil tank and driven by the same servo motor (M1), an outlet of the small-flow high-pressure pump (P1) is connected with an inlet of a cartridge valve I (C1), an outlet of the large-flow low-pressure pump (P2) is connected with inlets of a cartridge valve II (C2) and a cartridge valve III (C3), outlets of the cartridge valve I (C1) and the cartridge valve II (C2) are respectively connected with an inlet of a main pressure oil way (G1), and an outlet of the cartridge valve III (C3) is connected with the oil tank.
4. The wet-briquetting servo-pump-controlled hydraulic system of claim 1, wherein: a hydraulic control port of the hydraulic control liquid charging valve (DZ) is connected with a port B of a nine electromagnetic directional valve (YV9) through an oil pipe with the caliber of 10mm, a port P of the nine electromagnetic directional valve (YV9) is connected with a main pressure oil way (G1), and a port T of the nine electromagnetic directional valve (YV9) is connected with an oil tank through an independent oil return channel; a hydraulic control port of the cartridge valve eight (C8) is connected with a port A of the electromagnetic directional valve seven (YV7), a port P of the electromagnetic directional valve seven (YV7) is connected with a main pressure oil path (G1), and a port T of the electromagnetic directional valve seven (YV7) is connected with an oil tank; the seven (YV7) and nine (YV9) electromagnetic directional valves are two-position four-way electromagnetic directional valves.
5. The wet-briquetting servo-pump controlled hydraulic system of claim 2, wherein: a hydraulic control port of the cartridge valve nine (C9) is connected with inlets of a first pressure regulating valve (F1) and a second pressure regulating valve (F2), the inlets of the first pressure regulating valve (F1) and the second pressure regulating valve (F2) are also connected with a port P of a first electromagnetic directional valve, an outlet of the first pressure regulating valve (F1) is connected with a port B of the first electromagnetic directional valve, and an outlet of the second pressure regulating valve (F2) and a port T of the first electromagnetic directional valve are both connected with an oil tank; the main pressure oil path (G1) is also connected with a hydraulic control port of the cartridge valve nine (C9) through a damping pipe with the diameter of 1mm, and the electromagnetic directional valve is a three-position four-way electromagnetic directional valve with the H-shaped middle position function.
6. The wet-briquetting servo-pump controlled hydraulic system of claim 2, wherein: a hydraulic control port of the cartridge valve IV (C4) is connected with a middle outlet of the shuttle valve I (S1), a left inlet of the shuttle valve I (S1) is connected with an inlet of the cartridge valve V (C5), a right inlet of the shuttle valve I (S1) is connected with a port A of the electromagnetic directional valve V (YV5), a port P of the electromagnetic directional valve V (YV5) is connected with a main pressure oil path (G1), and a port T of the electromagnetic directional valve V (YV5) is connected with an oil tank; a hydraulic control port of the cartridge valve V (C5) is connected with a port A of the electromagnetic directional valve six (YV6), a port P of the electromagnetic directional valve six (YV6) is connected with a lower cavity oil way of the master cylinder (1), and a port T of the electromagnetic directional valve six (YV6) is connected with an oil tank; the lower cavity oil circuit of the master cylinder (1) is also connected with an inlet of a fifth pressure regulating valve (F5), and an outlet of the fifth pressure regulating valve (F5) is connected with an oil tank; and the fifth electromagnetic directional valve (YV5) and the sixth electromagnetic directional valve (YV6) are both two-position four-way electromagnetic directional valves.
7. The wet-briquetting servo-pump controlled hydraulic system of claim 2, wherein: the hydraulic control port of the cartridge valve six (C6) is connected with the P port of the electromagnetic directional valve four (YV4), the hydraulic control port of the cartridge valve six (C6) is also connected with the inlet of the pressure regulating valve four (F4) and the hydraulic control port thereof, the A port of the electromagnetic directional valve four (YV4) is connected with the inlet of the pressure regulating valve three (F3), and the outlets of the pressure regulating valve three (F3) and the pressure regulating valve four (F4) are respectively connected with the oil tank; a hydraulic control port of the cartridge valve seven (C7) is connected with a port A of the electromagnetic directional valve three (YV3), a port P of the electromagnetic directional valve three (YV3) is connected with an inlet of the cartridge valve seven (C7), and a port T is connected with an oil tank; the three electromagnetic directional valves (YV3) and the four electromagnetic directional valves (YV4) are two-position four-way electromagnetic directional valves.
8. The wet-briquetting servo-pump controlled hydraulic system of claim 2, wherein: the main pressure oil way (G1) is connected with an outlet of a cartridge valve ten (C10), an inlet of the cartridge valve ten (C10) is connected with the bottom of an energy accumulator (AC1), a hydraulic control port of the cartridge valve ten (C10) is connected with a port A of an electromagnetic directional valve ten (YV10), a port P of the electromagnetic directional valve ten (YV10) is connected with a middle outlet of a shuttle valve II (S2), a left inlet of the shuttle valve II (S2) is connected with the bottom of the energy accumulator (AC1), a right inlet of the shuttle valve II (S2) is connected with the main pressure oil way (G1), and a port T of the electromagnetic directional valve ten (YV10) is connected with an oil tank; the bottom pipeline of the accumulator (AC1) is connected with the inlet of the pressure regulating valve seven (F7), and the outlet of the pressure regulating valve seven (F7) is connected with the oil tank; the electromagnetic directional valve ten (YV10) is a two-position four-way electromagnetic directional valve.
9. The wet-briquetting servo-pump controlled hydraulic system of claim 3, wherein: a hydraulic control port of the cartridge valve III (C3) is connected with a port B of an electromagnetic directional valve VIII (YV8), and a port T of the electromagnetic directional valve VIII (YV8) is connected with an oil tank; the hydraulic control port of the cartridge valve III (C3) is also connected with the inlet of the pressure regulating valve III (F6) and the hydraulic control port thereof, the outlet of the pressure regulating valve IV (F6) is connected with the oil tank, and the electromagnetic directional valve VIII (YV8) is a two-position four-way electromagnetic directional valve.
10. The wet-briquetting servo-pump controlled hydraulic system of claim 3, wherein: the outlet of the low-flow high-pressure pump (P1) is also connected with a port P of an electromagnetic directional valve eleven through an oil pipe with the diameter of 6mm, a port A of the electromagnetic directional valve eleven is connected with the inlet of a hydraulic control one-way valve III (D3) and the hydraulic control port of a hydraulic control one-way valve II (D2), and the outlet of the hydraulic control one-way valve III (D3) is connected with the rod cavity of the locking cylinder (2); a port B of the first electromagnetic directional valve is connected with an inlet of a second hydraulic control one-way valve (D2) and a hydraulic control port of a third hydraulic control one-way valve (D3), an outlet of the second hydraulic control one-way valve (D2) is connected with a plug cavity of the locking cylinder (2), and a port T of the first electromagnetic directional valve is connected with an oil tank through an independent oil return channel; the electromagnetic directional valve eleven is a three-position four-way electromagnetic directional valve with a Y-shaped median function.
11. The wet-briquetting servo-pump controlled hydraulic system of claim 3, wherein: the air source pipe (G2) is connected with P openings of a first pneumatic solenoid valve (YA1) and a second pneumatic solenoid valve (YA2) through a filtering and reducing valve (5), T openings of the first pneumatic solenoid valve (YA1) and the second pneumatic solenoid valve (YA2) are communicated with the atmosphere through a silencer respectively, an opening A of the first pneumatic solenoid valve (YA1) is connected with the lower die blowing main pipe (G4) through a four-way valve (D4), and an opening A of the second pneumatic solenoid valve (YA2) is connected with the upper die blowing main pipe (G3) through a five-way valve (D5).
12. The hydraulic system of claim 11, wherein the operation comprises the steps of: the low-flow high-pressure pump (P1) operates independently, and the rotating speed of the servo motor (M1) is 400 rpm; when the electromagnetic directional valve V (YV5) is electrified, pressure oil pushes the cartridge valve IV (C4) away, then the cartridge valve V (C5) is pushed away, and the pressure oil enters the lower cavity of the main cylinder; the electromagnetic directional valve nine (YV9) is electrified, the upper cavity of the main cylinder releases pressure to the oil tank through the hydraulic control liquid charging valve (DZ), and the slide block performs slow die opening and lifting actions; then a first pneumatic electromagnetic valve (YA1) is electrified, compressed air enters a lower die blowing header pipe (G4) and is blown upwards from each lower die blowing hole of the lower die (4) to separate a product from the lower die (4), and blowing is stopped when blowing time is up; and then, the slide block slowly returns upwards to 50mm and stops, the second pneumatic electromagnetic valve (YA2) is powered on, compressed air enters the upper die air blowing header pipe (G3) and blows downwards from each upper die air blowing hole of the upper die (3) to separate the product from the upper die (3), and air blowing is stopped after air blowing time.
CN202011070370.4A 2020-10-09 2020-10-09 Wet-pressing forming servo pump control hydraulic system Active CN112211863B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107012747A (en) * 2017-06-02 2017-08-04 肇庆学院 Paper pulp moulding product automatic setting machine
CN207028305U (en) * 2017-07-03 2018-02-23 江苏国力锻压机床有限公司 A kind of hydraulic press of quick return
CN108561346A (en) * 2018-05-14 2018-09-21 江苏国力锻压机床有限公司 The precision pressure control system and hydraulic pressure processing method of servo-pump control hydraulic press

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107012747A (en) * 2017-06-02 2017-08-04 肇庆学院 Paper pulp moulding product automatic setting machine
CN207028305U (en) * 2017-07-03 2018-02-23 江苏国力锻压机床有限公司 A kind of hydraulic press of quick return
CN108561346A (en) * 2018-05-14 2018-09-21 江苏国力锻压机床有限公司 The precision pressure control system and hydraulic pressure processing method of servo-pump control hydraulic press

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