CN112297397A

CN112297397A - Wet pressing forming method of environment-friendly organic tableware

Info

Publication number: CN112297397A
Application number: CN202011070368.7A
Authority: CN
Inventors: 乔礼惠; 夏煜昊; 姜君杰
Original assignee: Jiangsu Guoli Forging Machine Tool Co Ltd
Current assignee: Jiangsu Yangli Hydraulic Equipment Co ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-02-02
Anticipated expiration: 2040-10-09
Also published as: CN112297397B

Abstract

The invention relates to a wet-pressing forming method of environment-friendly organic tableware, which comprises a plurality of hydraulic machines sharing a feeding robot, wherein each hydraulic machine is provided with an independent hydraulic system, and each working cycle comprises the following steps: the method includes the steps that a blank is placed on a hot-pressing lower die to complete feeding; the sliding block rapidly descends; thirdly, when the sliding block descends to the set conversion point position, the sliding block descends slowly until the hot-pressing upper die and the hot-pressing lower die are closed; maintaining pressure of the sliding block, and heating the blank by the hot-pressing upper die and the hot-pressing lower die simultaneously to shape the blank; fifthly, releasing pressure by the sliding block; sixthly, opening the hot-pressing upper die within 10mm upwards at a low speed; the bottom of the product is separated from the hot pressing lower die; and the slow return of the slider to the set height stops; the top of the self-supporting product is separated from the hot-pressing upper die, and the product falls on the hot-pressing lower die; the slide block returns quickly; taking the product as a recycle material. The wet-pressing forming method of the environment-friendly organic tableware can be used for carrying out wet-pressing and heating forming on the blank just leaving the slurry pool in a hydraulic machine, and obtaining the finished product of the environment-friendly organic tableware after demoulding.

Description

Wet pressing forming method of environment-friendly organic tableware

Technical Field

The invention relates to a production device of environment-friendly organic tableware, in particular to a wet-pressing forming method of the environment-friendly organic tableware, 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 method of environment-friendly organic tableware, which can be used for carrying out wet pressing and heating forming on a blank just leaving a slurry pool in a hydraulic machine and obtaining a finished product of the environment-friendly organic tableware after demoulding.

In order to solve the technical problems, the wet pressing forming method of the environment-friendly organic tableware comprises a plurality of hydraulic machines sharing one feeding robot, each hydraulic machine is provided with an independent hydraulic system, and each working cycle sequentially comprises the following steps: the method includes the steps that a blank is placed on a hot-pressing lower die to complete feeding; the sliding block rapidly descends; thirdly, when the sliding block descends to the set conversion point position, the sliding block descends slowly until the hot-pressing upper die and the hot-pressing lower die are closed; maintaining pressure of the sliding block, and heating the blank by the hot-pressing upper die and the hot-pressing lower die simultaneously to shape the blank; fifthly, releasing pressure by the sliding block; sixthly, opening the hot-pressing upper die within 10mm upwards at a low speed; the bottom of the product is separated from the hot pressing lower die; and the slow return of the slider to the set height stops; the top of the self-supporting product is separated from the hot-pressing upper die, and the product falls on the hot-pressing lower die; the slide block returns quickly; taking the product as a recycle material.

Compared with the prior art, the invention has the following beneficial effects: before the switching point is reached, the sliding block quickly descends, so that the working efficiency is improved; when the die is closed, the slide block moves downwards at a low speed and is pressurized. The heating and pressure maintaining time required by the wet pressing forming of the blank is longer, the feeding of other hydraulic machines is completed by utilizing the pressure maintaining time, and the production efficiency is further improved; a plurality of hydraulic machines share one feeding robot to feed in sequence, so that the investment cost can be saved. Because the blank is still adhered to the die wall after being shaped at high temperature and high pressure, the invention adopts the micro-opening and air blowing to remove the lower die; and the opening is slightly larger, the upper die is removed by blowing, and the phenomenon that the product is deformed or torn due to the overlarge opening at one time is avoided. After demoulding, the product can accurately fall into the hot-pressing lower die, so that the material taking robot can take materials conveniently.

As an improvement of the present invention, the step first sequentially includes the following substeps: firstly, a blank lower die with a filter screen picks up a certain amount of slurry from a slurry pool; secondly, the mechanical arm of the feeding robot controls the end effector to fall from the upper part, a blank upper die is arranged at the lower part of the end effector, and after the blank upper die and the blank lower die are closed, redundant slurry is extruded out to obtain a blank with a shape similar to that of the environment-friendly organic tableware; the end pick-up generates negative pressure to adsorb the blank below the upper die of the blank; fourthly, moving an end effector by a mechanical arm of the feeding robot, and putting the upper blank mould into the lower hot-pressing mould 4 of the hydraulic press; releasing the negative pressure by the end effector, and releasing the blank in the hot-pressing lower die 4; sixthly, the mechanical arm control end effector of the feeding robot moves out. The blank upper die is a forming tool and a transferring tool; after the blank is formed, the blank is transported by adopting a negative pressure adsorption method, so that the blank can be completely fed without damage.

As a further improvement of the invention, the hydraulic system comprises a main pressure oil path G1, the upper cavity of the main cylinder 1 is connected with an oil tank through a pilot-controlled charging valve DZ, the main pressure oil path G1 is connected with inlets of a cartridge valve four C4, a cartridge valve eight C8 and a cartridge valve nine C9, 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 master cylinder 1; the outlet of the cartridge valve four C4 is also connected with the inlets of the cartridge valve six C6 and the cartridge valve seven C7, and the outlets of the cartridge valve six C6, the cartridge valve seven C7 and the cartridge valve nine C9 are respectively connected with the 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 main pressure oil path G1 is decompressed, and the procedures of pressure maintaining of the slide block, heating and shaping of the blank, stopping of the slide block and the like can be performed. 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 a further improvement of the invention, inlets of a low-flow high-pressure pump P1 and a high-flow low-pressure pump P2 are both 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; 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 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. 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 runs to the hot-pressing upper die and the hot-pressing lower die 4 to be closed, 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, the upper cavity of the main cylinder can build high pressure, and the rotating speed of the servo motor M1 is 2000 rpm. When the slide block is subjected to pressure maintaining, blank heating and shaping, pressure relief, mold opening, demolding and locking, the electromagnetic directional valve eight YV8 loses power, 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, 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; 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 sliding block is decompressed, the die is opened, the hot pressing lower die is blown, and the electromagnetic directional valve 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 hot-pressing 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 method comprises the working procedures of pressure maintaining of a sliding block, heating and shaping of a blank, liquid charging and discharging of an energy accumulator, mold opening, demolding, return stroke, locking and the like, wherein the seven YV7 of the electromagnetic directional valve is in a power-off state, and pressure oil is prevented from entering an upper cavity of a 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.

When the slide block is quickly lowered, a worker advances, the accumulator is charged, the mold is opened, the hot-pressing lower mold blows and the slide block quickly returns, the 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, 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 and the blank is heated and shaped, the six YV6 of the electromagnetic directional valve is powered off, 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 the slow die opening and lifting action, then the hot pressing lower die blows air to separate the product from the hot pressing lower die, 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; during the pressure maintaining period of the slider, the left coil YV2 of the first electromagnetic directional valve is electrified, and the cartridge valve nine C9 is closed and controlled by the second pressure regulating valve 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. The environment-friendly organic tableware needs longer pressure maintaining time, and the energy accumulator AC1 is used for filling liquid by utilizing the pressure maintaining time, so that the working efficiency can be improved.

As a further improvement of the invention, in the steps, the left coil YV2 of the first electromagnetic directional valve is electrified, the cartridge valve nine C9 is closed and controlled by the pressure regulating valve two 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, and the pressure oil in the energy accumulator AC1 is released. When the slide block rapidly returns, the pressure oil in the energy accumulator AC1 is released, so that the return speed and the working efficiency can be improved.

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, a plurality of hot-pressing lower die blowing holes 4a are uniformly distributed below the die wall of the hot-pressing lower die 4, and each hot-pressing lower die blowing hole 4a is connected with a hot-pressing lower die blowing header pipe G4; the air source pipe G2 is connected with a P port of a first pneumatic electromagnetic valve YA1 through a filtering and reducing valve 5, a T port of the first pneumatic electromagnetic valve YA1 is communicated with the atmosphere through a silencer, and an A port of the first pneumatic electromagnetic valve YA1 is connected with a hot-pressing lower die blowing header pipe G4 through a check valve four D4; in the step-quieting, a pneumatic electromagnetic valve YA1 is electrified, compressed air enters a hot-pressing lower die blowing manifold G4 and is blown upwards from each hot-pressing lower die blowing hole 4a of the hot-pressing lower die 4, so that a product is separated from the hot-pressing lower die 4, and blowing is stopped after blowing time. 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 lower die is blown upwards from the hot pressing die to realize demoulding, so that defects caused by colliding with the product can be avoided, and the cooling and shaping of the product can be accelerated.

As a further improvement of the invention, a plurality of hot-pressing upper die blowing holes 3a are uniformly distributed on the die wall of the hot-pressing upper die 3, and each hot-pressing upper die blowing hole 3a is connected with a hot-pressing upper die blowing header pipe G3; an outlet of the filtering and reducing valve 5 is connected with a P port of a pneumatic electromagnetic valve II YA2, a T port of the pneumatic electromagnetic valve II YA2 is communicated with the atmosphere through a silencer, and an A port of the pneumatic electromagnetic valve II YA2 is connected with a hot-pressing upper die blowing manifold G3 through a five-way valve D5; in the step of self-lifting, the pneumatic solenoid valve YA2 is electrified, compressed air enters the hot-pressing upper die blowing manifold G3 and blows downwards from each hot-pressing upper die blowing hole 3a of the hot-pressing upper die 3, so that a product is separated from the hot-pressing upper die 3, and blowing is stopped after the blowing time. After the sliding block is lifted by 50mm, the air blowing holes 3a of the hot-pressing upper dies blow air downwards, so that the product is separated from the hot-pressing upper dies 3, the product can be prevented from being blown away, the product falls on the lower die, and the material taking robot can take the material conveniently.

As a further improvement of the invention, before die change or die repair: 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, 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; and (3) when the die change or die repair is finished: 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 piston rod of the locking cylinder 2 extends out, so that the sliding block is locked at the top dead center, and the safety of die replacement or die repair can be ensured; the energy can be saved by adopting the low-flow high-pressure pump P1 to independently work at the rotating speed of 1500 rpm.

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 front view illustrating a wet-press molding method of environmentally friendly organic tableware according to the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a left side view of fig. 1.

Fig. 4 is a perspective view of fig. 1.

FIG. 5 is a cross-sectional view of a single hydraulic press.

Fig. 6 is a perspective view of the upper die for hot pressing of the present invention.

Fig. 7 is a perspective view of the lower die for hot pressing of the present invention.

FIG. 8 is a hydraulic schematic of the hydraulic machine of the present invention.

FIG. 9 is a drawing of a mold release blowing system for hot pressing of upper and lower molds in accordance with the present invention.

In the figure: 1. a master cylinder; 2. a locking cylinder; 3. hot-pressing the upper die; 3a, hot-pressing an upper die blowing hole; 4. hot-pressing the lower die; 4a, hot-pressing a lower die blowing hole; 5. a filtering pressure reducing valve; 6. an upper cross beam; 7. a column; 7a. i-section steel; 8. cooling the plate with water; 9. a slider; 10. an upper heat insulation plate; 11. an upper heat conducting oil plate; 12. a lower heat conducting oil plate; 13. a lower heat insulation plate; 14. a work table; 15. a feeding robot; G1. a main pressure oil path; G2. a gas source pipe; G3. hot-pressing the upper die blowing header pipe; G4. hot-pressing the 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 to 7, the wet-pressing forming servo pump control system used in the present invention includes a plurality of hydraulic machines sharing a feeding robot, each hydraulic machine includes four upright posts 7, the tops of the four upright posts 7 are connected by an upper beam 6, the bottoms of the four upright posts 7 are connected with a workbench 14, a slider 9 is arranged between the upper beam 6 and the workbench 14, a main cylinder 1 is installed at the center of the upper beam 6, the lower end of a plunger of the main cylinder 1 is connected with the top of the slider 9, an upper heat-conducting oil plate 11 is installed below the slider 9, and a hot-pressing upper mold 3 is installed below the upper heat-conducting oil plate 11; a lower heat conduction oil plate 12 is installed above the workbench 14, and a hot pressing lower die 4 is arranged above the lower heat conduction oil plate 12.

The lower blank die with the filter screen picks up a certain amount of slurry from the slurry pool, then the mechanical arm of a feeding robot controls an end pick-up to fall from the upper part, the lower part of the end pick-up is provided with an upper blank die, after the upper blank die and the lower blank die are matched, redundant slurry is extruded to obtain a blank similar to the shape of the environment-friendly organic tableware, then the end pick-up generates negative pressure to adsorb the blank below the upper blank die, the mechanical arm of the feeding robot moves the end pick-up, after the upper blank die is placed into the lower hot-pressing die 4 of the hydraulic press, the end pick-up releases the negative pressure, the blank is released into the lower hot-pressing die 4, then the end pick-up moves out, and the upper hot-pressing die 3 moves downwards to be. The upper heat-conducting oil plate 11 heats the upper hot-pressing die 3, the lower heat-conducting oil plate 12 heats the lower hot-pressing die 4, and the blank is solidified and formed after being heated by the upper side and the lower side. In view of the fact that heating and pressure maintaining time required by wet pressing molding is long, feeding of other hydraulic machines can be completed by utilizing the pressure maintaining time, and production efficiency is improved; a plurality of hydraulic machines share one feeding robot to feed in sequence, so that the investment cost can be saved.

A lower heat insulation plate 13 is arranged between the workbench 14 and the lower heat conduction oil plate 12, an upper heat insulation plate 10 is arranged between the sliding block 9 and the upper heat conduction oil plate 11, and a water cooling plate 8 is arranged at the connecting part of the plunger of the main cylinder 1 and the sliding block 9. Because the blank needs high-temperature heating and forming, the lower heat-insulating plate 13 prevents the heat of the lower heat-conducting oil plate 12 from being conducted to the workbench 14, and the upper heat-insulating plate 10 prevents the heat of the upper heat-conducting oil plate 11 from being conducted to the sliding block 9, on one hand, the heat of the heat-conducting oil is used for heating the blank, the energy waste is reduced, and on the other hand, the hydraulic press is protected. The water cooling plate 8 can prevent heat from the sliding block from being conducted to the main cylinder 1, prevent the sealing ring of the main cylinder 1 from ageing too early, reduce the maintenance cost and improve the production efficiency of the equipment.

The outer surfaces of the upright post 7, the sliding block 9 and the workbench 14 are respectively provided with a stainless steel outer cladding or a high-temperature paint spraying metal plate outer cladding, the upright post 7 is respectively a square tube, an inner cavity of the upright post is respectively provided with I-shaped steel 7a, and the I-shaped steel 7a are respectively welded on the back of the guide rail at the inner side of the upright post. The stainless steel outer cladding or the high-temperature paint plastic-spraying metal plate outer cladding is convenient to clean and clean, and the pollution problem during slurry forming is reduced.

Every two hydraulic machines are mutually parallel to form a row, each liquid discharge hydraulic machine shares one set of oil tank and electric control system, and each hydraulic machine is respectively provided with an independent hydraulic system; two rows of hydraulic machines are symmetrically arranged on two sides of the feeding robot. The two hydraulic machines are provided with the independent hydraulic system and the servo pump set, so that the independent operation of a single machine can be ensured, one oil tank is shared, one cooling pump set can be shared, the use of hydraulic oil is reduced, the investment of an oil liquid cooling device is reduced, the pollution to the environment is reduced, and the energy is saved. The common electric control system can coordinate the working sequence of each hydraulic machine, and the hydraulic machines can stagger the time of feeding and discharging while carrying out each procedure in order, thereby improving the overall working efficiency of the whole machine.

As shown in fig. 8, the hydraulic system includes a primary pressure oil path G1, the upper chamber of the main cylinder 1 is connected to the oil tank through a pilot-controlled charging valve DZ, the primary pressure oil path G1 is connected to the inlets of the cartridge valve four C4 and the cartridge valve eight C8, and the outlet of the cartridge valve eight C8 is connected to the upper chamber of the main cylinder 1 through a check 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 main pressure oil path G1 is decompressed, and the procedures of pressure maintaining of the slide block, heating and shaping of the blank, stopping of the slide block and the like can be performed.

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.

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, a worker advances, the accumulator is charged, the mold is opened, the hot-pressing lower mold blows and the slide block quickly returns, the 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, 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 and the blank is heated and shaped, the six YV6 of the electromagnetic directional valve is powered off, 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 the slow die opening and lifting action, then the hot pressing lower die blows air to separate the product from the hot pressing 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 runs to the hot-pressing upper die and the hot-pressing lower die to be closed, 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, the upper cavity of the main cylinder can build high pressure, and the rotating speed of the servo motor M1 is 2000 rpm. When the slide block is subjected to pressure maintaining, blank heating and shaping, pressure relief, mold opening, demolding and locking, the electromagnetic directional valve eight YV8 loses power, 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. 9, the air source pipe G2 is connected to the P ports of the first pneumatic solenoid valve YA1 and the second pneumatic solenoid valve YA2 through the filtering and pressure reducing valve 5, the T ports of the first pneumatic solenoid valve YA1 and the second pneumatic solenoid valve YA2 are respectively communicated to the atmosphere through the muffler, the a port of the first pneumatic solenoid valve YA1 is connected to the hot press lower die blowing manifold G4 through the four check valves D4, and the a port of the second pneumatic solenoid valve YA2 is connected to the hot press upper die blowing manifold G3 through the five check valves 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 powered on, compressed air enters the hot pressing lower mold blowing manifold G4 and is blown upwards from each hot pressing lower mold blowing hole 4a of the hot pressing lower mold 4, so that a product is separated from the hot pressing lower mold 4, and the blowing is stopped when the blowing time is up. After the slide block is lifted by 50mm, the pneumatic electromagnetic valve YA2 is electrified, compressed air enters the hot-pressing upper die blowing manifold G3 and is blown downwards from each hot-pressing upper die blowing hole 3a of the hot-pressing upper die 3, so that a product is separated from the hot-pressing 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 wet-pressing forming method of the environment-friendly organic tableware comprises the following steps in each working cycle: the method includes the steps that a blank is placed on a hot-pressing lower die to complete feeding; the method sequentially comprises the following substeps: firstly, a blank lower die with a filter screen picks up a certain amount of slurry from a slurry pool; secondly, the mechanical arm of the feeding robot controls the end effector to fall from the upper part, a blank upper die is arranged at the lower part of the end effector, and after the blank upper die and the blank lower die are closed, redundant slurry is extruded out to obtain a blank with a shape similar to that of the environment-friendly organic tableware; the end pick-up generates negative pressure to adsorb the blank below the upper die of the blank; fourthly, moving an end effector by a mechanical arm of the feeding robot, and putting the upper blank mould into the lower hot-pressing mould 4 of the hydraulic press; releasing the negative pressure by the end effector, and releasing the blank in the hot-pressing lower die; sixthly, the mechanical arm control end effector of the feeding robot moves out.

The sliding block rapidly descends: 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 slide block is in a working mode: 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 runs to the hot-pressing upper die and the hot-pressing lower die to be closed, 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, the upper cavity of the main cylinder can build high pressure, and the rotating speed of the servo motor M1 is 2000 rpm.

Step four, pressure maintaining of the sliding block and shaping of the blank after heating: 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; and the hot-pressing upper die and the hot-pressing lower die simultaneously heat the blank to shape the blank.

And (3) charging the energy accumulator during the pressure maintaining period: 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 gets electricity, the master cylinder upper chamber releases pressure to the oil tank through the liquid control prefill valve DZ, the slide block carries out slow die opening uplifting action, and the opening height is controlled within 10 mm.

Hot-pressing lower die blowing: and the pneumatic electromagnetic valve YA1 is electrified, compressed air enters the hot-pressing lower die blowing manifold G4 and is blown upwards from the hot-pressing lower die blowing holes 4a of the hot-pressing lower die 4, so that the product is separated from the hot-pressing lower die 4, and blowing is stopped when blowing time is up.

Slider slow-back: the electromagnetic reversing valves eight YV8 are 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, when the slide block returns to a set position slowly, for example, 50mm, all the electromagnetic reversing valves are electrified, 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.

Self-body hot-pressing upper die blowing: when the pneumatic electromagnetic valve YA2 is powered on, compressed air enters the hot-pressing upper die blowing manifold G3 and blows downwards from each hot-pressing upper die blowing hole 3a of the hot-pressing upper die 3, so that the product is separated from the hot-pressing upper die 3, and blowing is stopped when blowing time is up.

The slider is quickly returned: 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.

And the material taking robot takes out the product from the hot pressing lower die.

When needing retooling or repairing the mould, before retooling or repairing the mould, the locking jar is ejecting: 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.

When the die change or die repair is finished, the locking cylinder retracts: 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

1. The wet-pressing forming method of the environment-friendly organic tableware comprises a plurality of hydraulic machines sharing one feeding robot, wherein each hydraulic machine is provided with an independent hydraulic system, and the wet-pressing forming method is characterized in that: each working cycle comprises the following steps in sequence: the method includes the steps that a blank is placed on a hot-pressing lower die to complete feeding; the sliding block rapidly descends; thirdly, when the sliding block descends to the set conversion point position, the sliding block descends slowly until the hot-pressing upper die and the hot-pressing lower die are closed; maintaining pressure of the sliding block, and heating the blank by the hot-pressing upper die and the hot-pressing lower die simultaneously to shape the blank; fifthly, releasing pressure by the sliding block; sixthly, opening the hot-pressing upper die within 10mm upwards at a low speed; the bottom of the product is separated from the hot pressing lower die; and the slow return of the slider to the set height stops; the top of the self-supporting product is separated from the hot-pressing upper die, and the product falls on the hot-pressing lower die; the slide block returns quickly; taking the product as a recycle material.

2. The wet-pressing forming method of the environment-friendly organic tableware according to claim 1, characterized by comprising the following substeps in sequence: firstly, a blank lower die with a filter screen picks up a certain amount of slurry from a slurry pool; secondly, the mechanical arm of the feeding robot controls the end effector to fall from the upper part, a blank upper die is arranged at the lower part of the end effector, and after the blank upper die and the blank lower die are closed, redundant slurry is extruded out to obtain a blank with a shape similar to that of the environment-friendly organic tableware; the end pick-up generates negative pressure to adsorb the blank below the upper die of the blank; fourthly, moving an end effector by a mechanical arm of the feeding robot, and putting the upper blank mould into a hot-pressing lower mould (4) of the hydraulic press; releasing the negative pressure by the end effector, and releasing the blank in the hot-pressing lower die; sixthly, the mechanical arm control end effector of the feeding robot moves out.

3. The wet-press molding method of environmentally friendly organic tableware according to claim 1, wherein: the hydraulic system comprises a main pressure oil path (G1), 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 inlets of a cartridge valve four (C4), a cartridge valve eight (C8) and a cartridge valve nine (C9), 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 with the inlet of cartridge valve five (C5), and the outlet of cartridge valve five (C5) is connected with the lower cavity of the master cylinder (1); the outlet of the cartridge valve IV (C4) is also connected with the inlets of the cartridge valve VI (C6) and the cartridge valve VII (C7), and the outlets of the cartridge valve VI (C6), the cartridge valve VII (C7) and the cartridge valve IX (C9) are respectively connected with the oil tank.

4. The wet-press molding method of environmentally friendly organic tableware according to claim 3, 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; 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.

5. The wet-press molding method of environmentally friendly organic tableware according to claim 3, 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; 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-press molding method of environmentally friendly organic tableware according to claim 3, 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-press molding method of environmentally friendly organic tableware according to claim 3, 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-press molding method of environmentally friendly organic tableware according to claim 5, 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; during the pressure maintaining period of the slider in the step four, the left coil (YV2) of the first electromagnetic directional valve is electrified, and the cartridge valve nine (C9) is closed and controlled by the second pressure regulating valve (F2); the electromagnetic directional valve ten (YV10) is electrified, the cartridge valve ten (C10) is opened due to the pressure relief of the hydraulic control port, the pressure oil enters the energy accumulator (AC1) to charge, and the charging time is up to the stop of charging.

9. The wet-press molding method of environmentally friendly organic tableware according to claim 8, wherein: in the step, a left coil (YV2) of a first electromagnetic directional valve is electrified, and a cartridge valve nine (C9) is closed and controlled by a second pressure regulating valve (F2); the electromagnetic directional valve V (YV5) is electrified, and pressure oil pushes the cartridge valve IV (C4) and the cartridge valve V (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, and the pressure oil in the accumulator (AC1) is released.

10. The wet-press molding method of environmentally friendly organic tableware according to claim 4, 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-press molding method of environmentally friendly organic tableware according to claim 1, wherein: a plurality of hot-pressing lower die blowing holes (4a) are uniformly distributed below the die wall of the hot-pressing lower die (4), and each hot-pressing lower die blowing hole (4a) is connected with a hot-pressing lower die blowing header pipe (G4); the air source pipe (G2) is connected with a P port of a first pneumatic electromagnetic valve (YA1) through a filtering and reducing valve (5), a T port of the first pneumatic electromagnetic valve (YA1) is communicated with the atmosphere through a silencer, and an A port of the first pneumatic electromagnetic valve (YA1) is connected with a hot-pressing lower die blowing header pipe (G4) through a check valve IV (D4); in the step, the first pneumatic solenoid valve (YA1) is powered on, compressed air enters the hot pressing lower die blowing manifold (G4), air is blown upwards from each hot pressing lower die blowing hole (4a) of the hot pressing lower die (4) to separate a product from the hot pressing lower die (4), and air blowing is stopped after air blowing time.

12. The wet-press molding method of environmentally friendly organic tableware according to claim 1, wherein: a plurality of hot-pressing upper die blowing holes (3a) are uniformly distributed on the die wall of the hot-pressing upper die (3), and each hot-pressing upper die blowing hole (3a) is connected with a hot-pressing upper die blowing header pipe (G3); an outlet of the filtering and reducing valve (5) is connected with a P port of a second pneumatic electromagnetic valve (YA2), a T port of the second pneumatic electromagnetic valve (YA2) is communicated with the atmosphere through a silencer, and an A port of the second pneumatic electromagnetic valve (YA2) is connected with a hot-pressing upper die blowing header pipe (G3) through a five-way valve (D5); in the step of self-lifting, the second pneumatic electromagnetic valve (YA2) is electrified, compressed air enters the hot-pressing upper die blowing manifold (G3) and blows downwards from each hot-pressing upper die blowing hole (3a) of the hot-pressing upper die (3), so that a product is separated from the hot-pressing upper die (3), and blowing is stopped after the blowing time.

13. The wet-pressing method for forming environmentally friendly organic tableware according to claim 10, wherein before the die change or the die repair: 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, 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; and (3) when the die change or die repair is finished: a right coil (YV11) of the electromagnetic directional valve eleven 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.