CN114032708B - Semi-dry pressed plant fiber molding machine and molding method - Google Patents
Semi-dry pressed plant fiber molding machine and molding method Download PDFInfo
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- CN114032708B CN114032708B CN202111480966.6A CN202111480966A CN114032708B CN 114032708 B CN114032708 B CN 114032708B CN 202111480966 A CN202111480966 A CN 202111480966A CN 114032708 B CN114032708 B CN 114032708B
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- suction filtration
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- 238000000465 moulding Methods 0.000 title claims abstract description 36
- 239000000835 fiber Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- 210000001161 mammalian embryo Anatomy 0.000 claims abstract description 256
- 239000002002 slurry Substances 0.000 claims abstract description 144
- 238000007731 hot pressing Methods 0.000 claims abstract description 131
- 238000000967 suction filtration Methods 0.000 claims description 117
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 98
- 238000003860 storage Methods 0.000 claims description 57
- 238000003825 pressing Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- 230000003028 elevating effect Effects 0.000 claims 5
- 235000013311 vegetables Nutrition 0.000 claims 2
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000007664 blowing Methods 0.000 description 37
- 239000007788 liquid Substances 0.000 description 32
- 238000009423 ventilation Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
The invention discloses a semi-dry pressed plant fiber molding machine and a molding method. The forming machine comprises a frame, wherein a wet blank transferring device, a hot press forming device symmetrically arranged on the left side and the right side of the wet blank transferring device and a pulp dragging device arranged below the wet blank transferring device are arranged on the frame, the wet blank transferring device comprises a support, a wet blank transferring die arranged on the support and a first lifting mechanism for driving the wet blank transferring die to lift along the support, a guide rail moving along the left and right direction is further arranged on the frame, and a sliding block capable of sliding along the guide rail and a driving mechanism for driving the sliding block to slide are arranged on the guide rail, and the sliding block is fixedly connected with the support. The invention can reduce the moisture content of wet embryo in the production process, thereby reducing the influence of scale and slurry scraps on the hot pressing lower die and the machine frame, improving the machine start rate, reducing the heat energy consumption, enabling the wet embryo transfer die to move left and right to transfer the wet embryo, keeping the hot pressing lower die motionless and avoiding the slurry tank from being polluted.
Description
Technical Field
The invention relates to the technical field of plant fiber molding equipment, in particular to a semi-dry pressing plant fiber molding machine and a molding method.
Background
The existing plant fiber molding machine has two types of dry pressing and wet pressing. The dry-pressed plant fiber molding machine adopts a cold pressing die and a suction filtering die to die, presses out wet embryo, then dries (or dries) the wet embryo, and then performs compression molding and shaping to produce a product.
In the production process of the wet-pressed plant fiber molding machine, a wet embryo transfer mold firstly descends and is matched with a suction filtration mold in a slurry tank below, wet embryo molding is carried out, the moisture content of the wet embryo is higher, the wet embryo transfer mold adsorbs the wet embryo to ascend, then a hot-pressing lower mold moves to the lower part of the wet embryo transfer mold, the wet embryo transfer mold descends and is matched with a hot-pressing lower mold, the wet embryo is placed into the hot-pressing lower mold and is subjected to primary shaping, finally the hot-pressing lower mold moves to the lower part of a hot-pressing upper mold, the hot-pressing upper mold descends and is matched with the hot-pressing lower mold, and the product is finally shaped, so that the surface of the product produced by the method is smooth, attractive and beautiful, but the following defects exist:
(1) Because the moisture content of wet blanks is high in the production process, the exhaust holes of the hot-pressing die are easily blocked by scale and slurry scraps, and the hot-pressing die is required to be frequently disassembled for through hole die washing; in the process of clamping the hot pressing upper die and the hot pressing lower die, slurry scraps fly to machine parts such as a rack along with water vapor discharged from the outer side of the die, so that pollution is caused, and the machine needs to be cleaned frequently.
(2) The high moisture content of the wet embryo increases heat energy consumption.
(3) When the hot pressing lower die moves to the lower part of the wet embryo adsorption die, the hot pressing lower die is positioned right above the slurry tank, and impurities such as greasy dirt, scrap iron and the like are easy to fall into the slurry tank, so that the slurry tank is polluted, and the product percent of pass is reduced.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a semi-dry pressing plant fiber molding machine and a molding method, which can reduce the moisture content of wet embryo in the production process, thereby reducing the influence of scale and slurry scraps on a hot pressing lower die and a frame, reducing heat energy consumption, enabling the wet embryo transfer die to move left and right to transfer the wet embryo, enabling the hot pressing lower die to be motionless, and avoiding pollution of a slurry tank.
In order to solve the problems, the invention is realized by adopting the following technical scheme:
the invention discloses a semi-dry pressed plant fiber molding machine, which comprises a frame, wherein a wet embryo transfer device, a hot pressing molding device symmetrically arranged at the left side and the right side of the wet embryo transfer device and a pulp dragging device arranged below the wet embryo transfer device are arranged on the frame, the wet embryo transfer device comprises a bracket, a wet embryo transfer die arranged on the bracket and a first lifting mechanism for driving the wet embryo transfer die to lift along the bracket, the hot pressing molding device comprises a hot pressing die, a hot pressing upper die and a second lifting mechanism for driving the hot pressing upper die to lift, the pulp dragging device comprises a pulp tank, a suction filtration die positioned in the pulp tank and a third lifting mechanism for driving the suction filtration die to lift, a guide rail which moves along the left side and the right side is further arranged on the frame, a sliding block capable of sliding along the guide rail and a driving mechanism for driving the sliding block are arranged on the guide rail, and the sliding block is fixedly connected with the bracket, and the wet embryo transfer die can move along the guide rail between the upper part of the hot pressing lower die at the left side and the upper part of the pulp tank and the upper part of the hot pressing die at the right side.
In the scheme, the guide rail is arranged on the frame and passes through the left hot-pressing lower die, the slurry tank and the right hot-pressing lower die, and the bracket moves along the guide rail to enable the wet blank transfer die to move along the guide rail among the upper part of the left hot-pressing lower die, the upper part of the slurry tank and the upper part of the right hot-pressing lower die.
At first, the wet embryo transfer mould is positioned above the slurry tank, the suction filtration mould descends into the slurry in the slurry tank to suck the slurry, and after the slurry suction is finished, the suction filtration mould ascends to leave the slurry, and the wet embryo is formed on the suction filtration mould; the wet embryo transfer die descends and is matched with the suction filtration die, the wet embryo transfer die extrudes the wet embryo on the suction filtration die, the wet embryo is extruded with water, and the water content of the formed wet embryo is reduced; pumping air from the wet embryo transfer mould, sucking the formed wet embryo by the wet embryo transfer mould, and pumping water and vapor entering the wet embryo transfer mould in the mould closing process of the wet embryo transfer mould and the suction filtration mould; the wet embryo transfer mould moves to the upper part of the hot pressing lower mould at one side along the guide rail, the wet embryo transfer mould descends to a position close to the hot pressing lower mould, the wet embryo transfer mould blows air to the wet embryo, meanwhile, the hot pressing lower mould sucks air in vacuum, the wet embryo falls onto the hot pressing lower mould from the wet embryo transfer mould, and the wet embryo is attached to the hot pressing lower mould; finally, the wet embryo transfer mould moves to the upper part of the slurry tank along the guide rail to continuously absorb new wet embryo, the hot pressing upper mould above the hot pressing lower mould with the wet embryo descends to be matched with the hot pressing lower mould, the wet embryo is heated and formed into a product, and then the hot pressing upper mould ascends to be taken away by the grabbing mechanism.
The scheme reduces the moisture content of the wet embryo in the production process, thereby reducing the influence of scale and slurry scraps on the hot pressing lower die and the frame, reducing the heat energy consumption, enabling the wet embryo transfer die to move left and right and transfer the wet embryo, enabling the hot pressing lower die to be motionless, and avoiding the slurry tank from being polluted by oil stains, scrap iron and other impurities on the hot pressing lower die.
Preferably, the wet blank transfer mold comprises a first plate body and a cover plate, wherein a plurality of downward protruding wet blank forming surfaces are arranged on the bottom surface of the first plate body, an air ring is arranged on the outer edge of the wet blank forming surfaces, the air ring is formed by a plurality of air holes which are arrayed and encircled along the outer edge of the wet blank forming surfaces to form a ring shape, grooves are formed in the positions, corresponding to the first plate body top surface and the wet blank forming surfaces, of the air ring top, the grooves are internally provided with water storage tanks, the water storage tanks are arranged on the inner sides of the air ring corresponding to the wet blank forming surfaces, the plane on which the top of the air ring is located is connected with the corresponding water storage tanks through downward inclined annular inclined planes, the cover plate covers the top surface of the first plate body, and air pipelines communicated with the grooves are arranged on the cover plate.
The ventilation pipeline is connected with an external air extracting device and an external air blowing device, and the ventilation hole can be used for sucking air and blowing air. When the wet embryo transfer mould and the suction filtration mould are assembled, the air extractor is used for extracting air from the wet embryo transfer mould, so that the wet embryo is absorbed on the wet embryo molding surface of the wet embryo transfer mould, the wet embryo can be extruded when the wet embryo transfer mould and the suction filtration mould are assembled, the extruded moisture part of the wet embryo enters the groove through the air vent, and the air extractor is used for extracting air from the wet embryo transfer mould, so that the moisture and the water vapor in the wet embryo transfer mould can be absorbed. In the process that the wet embryo transfer mould transfers the wet embryo to the hot pressing lower mould at one side, the wet embryo transfer mould firstly moves to the upper part of the hot pressing lower mould and then descends to a position close to the hot pressing lower mould, and the blowing device blows the wet embryo transfer mould to blow the wet embryo to the hot pressing lower mould, so that the whole process is not contacted with the hot pressing lower mould.
When the wet blank is absorbed to the forming surface of the wet blank, part of the extruded moisture is absorbed around the top of the vent hole, and although the air extractor absorbs most of the moisture and water vapor in the wet blank transfer mold, part of the moisture still remains around the top of the vent hole, in addition, the water vapor content in the blown air is larger, and water drops are easily condensed around the top of the vent hole. The water storage tank is used for storing water drops, the water drops around the top of the vent hole conveniently flow into the water storage tank through the annular inclined plane, when the blowing device blows the wet embryo to the hot pressing lower die, when the blowing device blows the wet embryo to the top of the vent hole, the water drops around the top of the vent hole can be blown into the water storage tank, and the water drops around the top of the vent hole can not be blown into the vent hole, so that the water drops around the top of the vent hole are prevented from being blown to the wet embryo, the defects such as watermarks are avoided, meanwhile, the water content of the wet embryo can be reduced, and water in the water storage tank can be pumped away when the air extractor pumps the wet embryo transferring die.
Preferably, adjacent grooves are communicated by a connecting groove. The water storage tank is an inwards concave stepped tank. The ventilation ring is circular. The included angle between the annular inclined plane and the horizontal plane is 20-30 degrees.
Preferably, the suction filtration die comprises a suction filtration bottom plate and a suction filtration die core arranged above the suction filtration bottom plate, the suction filtration bottom plate comprises a second plate body, suction filtration grooves are formed in the top surface of the second plate body, a plurality of suction filtration cavities are uniformly distributed in the bottom surface of the suction filtration groove, suction filtration holes are formed in the centers of the suction filtration cavities, a baffle plate arranged horizontally is further arranged above the suction filtration cavities, and the baffle plate is located right above the suction filtration holes, and a suction pipe communicated with the suction filtration holes is arranged on the bottom surface of the second plate body.
The water suction pipe is connected with an external vacuum negative pressure device. When the pulp is sucked, the vacuum negative pressure device sucks the pulp through the water suction pipe, moisture in the pulp enters the suction filter tank and is pumped away through the suction filter holes, and as the suction filter cavities are uniformly distributed and the baffle plates are arranged right above each suction filter hole, the vacuum degree on the suction filter screen of the suction filter mold core is more uniform, so that the pulp suction is more uniform, and the consistency of the thickness and the gram weight of the product are ensured.
Preferably, the suction filter cavity is inclined downwards from outside to inside. Ensure no ponding in the suction filter tank and effectively reduce the moisture content of wet embryo during transfer.
Preferably, the suction filter cavity is funnel-shaped. The baffle is connected with the suction filtration cavity through a connecting column. The baffle is rectangular.
Preferably, a stop block is arranged between the adjacent suction filter cavities. So that the slurry suction is more uniform.
Preferably, a blowing hole is arranged in the center of the suction filtration groove, and a blowing pipeline communicated with the blowing hole is arranged on the bottom surface of the second plate body.
Preferably, the slurry tank comprises a tank body, the tank body is provided with a slurry storage tank, the slurry storage tank comprises a slurry storage chamber and slurry overflow chambers symmetrically arranged on the front side and the rear side of the slurry storage chamber, the slurry overflow chambers are separated from each other by a slurry overflow plate, the left end and the right end of the slurry overflow plate are bent to form an arc shape towards one side of the slurry storage chamber, the lower parts of the left side wall and the right side wall of the tank body are provided with slurry inlets, the slurry inlets are communicated with the slurry storage chamber, slurry overflow ports are arranged at positions, corresponding to the slurry overflow chambers, of the bottom of the tank body, the slurry overflow ports are communicated with the corresponding slurry overflow chambers, and the suction filtration die is positioned in the slurry overflow chambers.
The thick liquid gets into the thick liquid room of storing up from the inlet, and thick liquid gets into the thick liquid room from the overflow board upper end after fully leaving the thick liquid room of storing up, later discharges the thick liquid groove device through the overflow mouth, and the inlet is located the side of storing up the thick liquid room, and the side advances thick liquid and is convenient for thick liquid circulation flow in the thick liquid groove, has guaranteed that thick liquid concentration is even, separates through the overflow board between overflow room and the storing up the thick liquid room, and the left and right sides of overflow board is crooked into the arc to storing up thick liquid room one side, and the thick liquid of being convenient for flows, and no dead angle is difficult for the thick liquid of accumulating, prevents that the thick liquid from polluting.
Preferably, the left side and the right side of the bottom surface of the pulp storage chamber are symmetrically provided with air blowing pipes, two ends of each air blowing pipe are provided with air blowing ports, the middle part of each air blowing pipe is provided with an air inlet, and the bottom of the box body is provided with an air inlet pipeline communicated with the air inlet.
And the slurry is blown into the slurry storage chamber through the blowing pipe, so that the slurry can flow circularly. According to different slurry concentrations, the blowing frequency and the time length are reasonably controlled to achieve optimal slurry and reasonable energy consumption.
Preferably, the height of the overflow plate is smaller than the depth of the slurry storage tank.
Preferably, a slurry blocking cover plate horizontally arranged is arranged above the slurry overflow chamber and connected with the box body, and the height of the slurry blocking cover plate is higher than the top height of the slurry overflow plate.
Preferably, a drain outlet communicated with the slurry storage chamber is arranged at the bottom of the box body.
Preferably, the slurry inlet on the left side wall of the box body is positioned at the front lower part of the left side wall of the box body, and the slurry inlet on the right side wall of the box body is positioned at the rear lower part of the right side wall of the box body.
Preferably, the third lifting mechanism comprises lifting components symmetrically arranged on the left side and the right side of the slurry tank and a synchronous component for enabling the lifting components to synchronously lift, the lifting components comprise a hydraulic cylinder and connecting pieces, the hydraulic cylinder is vertically arranged, the lifting end of the hydraulic cylinder is connected with the suction filtration die through the connecting pieces, and the two connecting pieces are connected through the synchronous component. The synchronous component enables the two lifting components to synchronously lift, and the stable lifting of the slurry tank is ensured.
The invention relates to a molding method of semi-dry pressed plant fiber, which is used for the semi-dry pressed plant fiber molding machine and comprises the following steps:
s1: the suction filtration die descends into the slurry in the slurry tank to suck the slurry, and after the slurry suction is finished, the suction filtration die ascends to leave the slurry, and wet embryo is formed on the suction filtration die;
s2: the wet embryo transfer die descends and closes the suction filtration die, the wet embryo transfer die extrudes the wet embryo on the suction filtration die to form the wet embryo, and meanwhile, the suction filtration bottom plate is pumped, and the water extruded by the wet embryo and flowing into the suction filtration bottom plate is sucked away;
s3: pumping air from the wet embryo transfer mould, sucking the formed wet embryo by the wet embryo transfer mould, and pumping water and vapor entering the wet embryo transfer mould in the mould closing process of the wet embryo transfer mould and the suction filtration mould;
s4: the wet embryo transfer mould moves to the upper part of the hot pressing lower mould at one side along the guide rail, the wet embryo transfer mould descends to the position 0.8-2 mm away from the hot pressing lower mould, the wet embryo transfer mould blows the wet embryo, and simultaneously the hot pressing lower mould sucks air, and the wet embryo falls onto the hot pressing lower mould from the wet embryo transfer mould;
s5: the wet embryo transfer mould moves to the upper part of the slurry tank along the guide rail to continuously absorb new wet embryo, the hot pressing upper mould above the hot pressing lower mould with the wet embryo descends to be matched with the hot pressing lower mould, the wet embryo is heated and formed into a product, and then the hot pressing upper mould ascends to be taken away by the grabbing mechanism.
In the scheme, when the wet embryo transfer die and the suction filtration die are assembled, the wet embryo transfer die extrudes the wet embryo on the suction filtration die, extrudes moisture from the wet embryo, reduces the moisture content of the formed wet embryo, and simultaneously pumps air to the suction filtration bottom plate when extruding the moisture, so that the moisture extruded from the wet embryo and flowing into the suction filtration bottom plate is sucked away, and the moisture content of the wet embryo is further reduced. When the wet blank transfer mold sucks the formed wet blank, part of the extruded moisture is sucked around the top of the vent hole, and although the air extractor sucks most of the moisture and water vapor in the wet blank transfer mold, part of the moisture remains around the top of the vent hole, in addition, the water vapor content in the blown air is larger, water drops are easily condensed around the top of the vent hole, and the condensed water drops flow into the water storage tank. When the blowing device blows the wet embryo to the hot pressing lower die, the water drops around the top of the vent hole can be blown into the water storage tank when the air blown by the blowing device blows the wet embryo to the top of the vent hole, but the water drops can not be blown into the vent hole, so that the water drops around the top of the vent hole are prevented from being blown to the wet embryo, the water content of the wet embryo is prevented from being improved, and the water in the water storage tank can be pumped away when the air pumping device pumps the wet embryo transfer die. The water content of the wet embryo can be ensured to be maintained in a lower stable state after the treatment of the steps, so that the influence of scale and slurry scraps on a hot pressing lower die and a frame is reduced, and the heat energy consumption is reduced.
And S4, blowing the wet embryo by the wet embryo transfer die, and simultaneously, carrying out vacuum suction on the hot pressing die to ensure that the wet embryo is attached to a die cavity of the hot pressing die when transferred to the hot pressing die.
Preferably, the extrusion force of the wet embryo on the wet embryo transfer die extrusion suction die in the step S2 is 10-16MPa, and the extrusion time is 2-4 seconds, so that the water content of the wet embryo reaches 58% -63%.
Preferably, in the step S5, the temperature of the hot pressing lower die is 160-190 ℃, the temperature of the hot pressing upper die is 160-190 ℃, and the die closing time is 10-25 seconds. The water content of the product after heating and forming is 3% -5%.
The beneficial effects of the invention are as follows: (1) The wet embryo water content in the production process can be reduced, so that the influence of scale and slurry scraps on the hot pressing lower die and the machine frame is reduced, and the heat energy consumption is reduced. (2) The wet embryo transfer mould can move left and right to transfer the wet embryo, and the hot pressing mould is not moved, so that the slurry tank is prevented from being polluted.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a schematic view of the structure of a wet embryo transfer mold;
FIG. 4 is a schematic view of the bottom surface structure of the wet blank transfer mold;
FIG. 5 is a top view of the wet embryo transfer mold;
FIG. 6 is a cross-sectional view A-A of FIG. 5;
FIG. 7 is a schematic structural view of the slurry scooping device;
FIG. 8 is a schematic view of the structure of a suction filtration base plate;
FIG. 9 is a schematic view of the bottom surface structure of the suction filtration base plate;
FIG. 10 is a top view of a suction filtration deck;
FIG. 11 is a B-B cross-sectional view of FIG. 10;
FIG. 12 is a schematic view of the structure of a vat;
FIG. 13 is a schematic view of the bottom surface structure of the vat;
fig. 14 is a top view of the vat.
In the figure: 1. a frame, a wet blank transfer device, a hot press forming device, a slurry dragging device, a guide rail, a slide block and a hot press forming device; 21. the device comprises a bracket, 22, a wet embryo transfer die, 23, a first lifting mechanism, 31, a hot pressing lower die, 32, a hot pressing upper die, 33, a second lifting mechanism, 40, a slurry tank, 42, a suction filtration die, 44 and a third lifting mechanism;
221. the first plate body 222, the cover plate 223, the wet blank forming surface 224, the ventilation ring 225, the ventilation holes 226, the water storage tank 227, the annular inclined surface 228, the groove 229 and the connecting groove; 421. the filter comprises a filter bottom plate 422, a filter core 423, a second plate body 424, a filter groove 425, a filter cavity 426, a filter hole 427, a baffle plate 428, a water suction pipe 429, a baffle plate 430, a gas hole 431 and a gas blowing pipeline; 401. the device comprises a box body 402, a pulp storage chamber 403, a pulp overflow chamber 404, a pulp overflow plate 405, a pulp inlet, 406, a pulp overflow port 407, a pulp blocking cover plate 408, a gas blowing pipe 409, a gas blowing port 410, a gas inlet pipeline 411 and a drain outlet; 441. hydraulic ram, 442, connection, 443, synchronization assembly.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Examples: the semi-dry pressing plant fiber molding machine of this embodiment, as shown in fig. 1 and 2, includes a frame 1, a wet embryo transfer device 2, a hot pressing device 3 symmetrically disposed on the left and right sides of the wet embryo transfer device 2, and a pulp scooping device 4 disposed below the wet embryo transfer device 2 are disposed on the frame 1, the wet embryo transfer device 2 includes a support 21, a wet embryo transfer die 22 disposed on the support 21, and a first lifting mechanism 23 for driving the wet embryo transfer die 22 to lift along the support 21, the hot pressing device 3 includes a hot pressing die 31, a hot pressing upper die 32, and a second lifting mechanism 33 for driving the hot pressing upper die 32 to lift, the pulp scooping device 4 includes a pulp tank 40, a suction die 42 disposed in the pulp tank 40, and a third lifting mechanism 44 for driving the suction die 42 to lift, a guide rail 5 running along the left and right direction is disposed on the frame 1, a slider 6 slidable along the guide rail 5, and a driving mechanism for driving the slider 6 to slide are fixedly connected with the support 21, and the wet embryo transfer die 22 can move along the guide rail 5, above the pulp tank, above the hot pressing die, above and below the left side, and above the hot pressing die.
As shown in fig. 3, fig. 4, fig. 5 and fig. 6, the wet blank transfer mold 22 comprises a first plate body 221 and a cover plate 222, the bottom surface of the first plate body 221 is provided with a plurality of wet blank forming surfaces 223 protruding downwards, the outer edge of the wet blank forming surfaces 223 is provided with an air ring 224, the air ring 224 is in a circular ring shape, the air ring 224 is formed by a plurality of air holes 225 which are arrayed and encircled along the outer edge of the wet blank forming surfaces 223 to form a ring shape, grooves 228 are arranged at the corresponding positions of the top surface of the first plate body 221 and the wet blank forming surfaces 223, adjacent grooves 228 are communicated through connecting grooves 229, the top of the air ring 224 is positioned in the corresponding grooves 228, a water storage groove 226 is arranged in the grooves 228, the water storage groove 226 is an inwards concave stepped groove, the water storage groove 226 is positioned inside the air ring 224 corresponding to the wet blank forming surfaces 223, the plane on which the top of the air ring 224 is positioned is connected with the corresponding water storage groove 226 through a downwards inclined annular inclined surface 227, the cover plate 222 covers the top surface of the first plate body 221, an air pipe communicated with the grooves 228 is arranged on the cover plate 222, and the included angle between the annular inclined surface 227 and the horizontal plane is 20-30 degrees.
The ventilation pipeline on the cover plate is connected with an external air extracting device and an external air blowing device, and the ventilation hole can be used for sucking air and blowing air. When the wet embryo transfer mould and the suction filtration mould are assembled, the air extractor is used for extracting air from the wet embryo transfer mould, so that the wet embryo is absorbed on the wet embryo molding surface of the wet embryo transfer mould, the wet embryo can be extruded when the wet embryo transfer mould and the suction filtration mould are assembled, the extruded moisture part of the wet embryo enters the groove through the air vent, and the air extractor is used for extracting air from the wet embryo transfer mould, so that the moisture and the water vapor in the wet embryo transfer mould can be absorbed. In the process that the wet embryo transfer mould transfers the wet embryo to the hot pressing lower mould at one side, the wet embryo transfer mould firstly moves to the upper part of the hot pressing lower mould and then descends to a position close to the hot pressing lower mould, and the blowing device blows the wet embryo transfer mould to blow the wet embryo to the hot pressing lower mould, so that the whole process is not contacted with the hot pressing lower mould.
When the wet blank is absorbed to the forming surface of the wet blank, part of the extruded moisture is absorbed around the top of the vent hole, and although the air extractor absorbs most of the moisture and water vapor in the wet blank transfer mold, part of the moisture still remains around the top of the vent hole, in addition, the water vapor content in the blown air is larger, and water drops are easily condensed around the top of the vent hole. The water storage tank is used for storing water drops, the water drops around the top of the vent hole conveniently flow into the water storage tank through the annular inclined plane, when the blowing device blows the wet embryo to the hot pressing lower die, when the blowing device blows the wet embryo to the top of the vent hole, the water drops around the top of the vent hole can be blown into the water storage tank, and the water drops around the top of the vent hole can not be blown into the vent hole, so that the water drops around the top of the vent hole are prevented from being blown to the wet embryo, the defects such as watermarks are avoided, meanwhile, the water content of the wet embryo can be reduced, and water in the water storage tank can be pumped away when the air extractor pumps the wet embryo transferring die.
As shown in fig. 8, 9, 10 and 11, the suction filtration die 42 includes a suction filtration bottom plate 421 and a suction filtration die core 422 disposed above the suction filtration bottom plate 421, the suction filtration bottom plate 421 includes a second plate body 423, a suction filtration groove 424 is disposed on a top surface of the second plate body 423, a plurality of suction filtration cavities 425 are uniformly distributed on a bottom surface of the suction filtration groove 424, a suction filtration hole 426 is disposed at a center of the suction filtration cavity 425, a baffle 427 disposed horizontally is disposed above the suction filtration cavity 425, the baffle 427 is disposed right above the suction filtration hole 426, and a suction pipe 428 communicated with the suction filtration hole 426 is disposed on a bottom surface of the second plate body 423. The suction filtration cavity 425 inclines downwards from outside to inside, the suction filtration cavity 425 is funnel-shaped, the baffle 427 is connected with the suction filtration cavity 425 through a connecting column, the baffle 427 is rectangular, a stop 429 is arranged between adjacent suction filtration cavities 425, a blowing hole 430 is arranged in the center of the suction filtration groove 424, and a blowing pipeline 431 communicated with the blowing hole 430 is arranged on the bottom surface of the second plate 423.
The water suction pipe is connected with an external vacuum negative pressure device. When the pulp is sucked, the vacuum negative pressure device sucks the pulp through the water suction pipe, moisture in the pulp enters the suction filter tank and is pumped away through the suction filter holes, and as the suction filter cavities are uniformly distributed and baffle plates are arranged right above each suction filter hole, a baffle block is arranged between adjacent suction filter cavities, the vacuum degree on the suction filter screen of the suction filter mold core is more uniform, so that the pulp suction is more uniform, and the consistency of the thickness and the gram weight of the product are ensured. The suction filtration cavity is inclined downwards from outside to inside, so that no ponding exists in the suction filtration groove, and the moisture content of wet embryo during transfer is effectively reduced.
In the scheme, the guide rail is arranged on the frame and passes through the left hot-pressing lower die, the slurry tank and the right hot-pressing lower die, and the bracket moves along the guide rail to enable the wet blank transfer die to move along the guide rail among the upper part of the left hot-pressing lower die, the upper part of the slurry tank and the upper part of the right hot-pressing lower die. The semi-dry plant fiber molding machine is controlled by the controller to work, and the external air extracting device, the air blowing device and the vacuum negative pressure device are also controlled by the controller to work.
At first, the wet embryo transfer mould is positioned above the slurry tank, the suction filtration mould descends into the slurry in the slurry tank to suck the slurry, and after the slurry suction is finished, the suction filtration mould ascends to leave the slurry, and the wet embryo is formed on the suction filtration mould; the wet embryo transfer die descends and is matched with the suction filtration die, the wet embryo transfer die extrudes the wet embryo on the suction filtration die, the wet embryo is extruded with water, and the water content of the formed wet embryo is reduced; pumping air from the wet embryo transfer mould, sucking the formed wet embryo by the wet embryo transfer mould, and pumping water and vapor entering the wet embryo transfer mould in the mould closing process of the wet embryo transfer mould and the suction filtration mould; the wet embryo transfer mould moves to the upper part of the hot pressing lower mould at one side along the guide rail, the wet embryo transfer mould descends to a position close to the hot pressing lower mould, the wet embryo transfer mould blows air to the wet embryo, meanwhile, the hot pressing lower mould sucks air in vacuum, the wet embryo falls onto the hot pressing lower mould from the wet embryo transfer mould, and the wet embryo is attached to the hot pressing lower mould; finally, the wet embryo transfer mould moves to the upper part of the slurry tank along the guide rail to continuously absorb new wet embryo, the hot pressing upper mould above the hot pressing lower mould with the wet embryo descends to be matched with the hot pressing lower mould, the wet embryo is heated and formed into a product, and then the hot pressing upper mould ascends to be taken away by the grabbing mechanism.
When the wet embryo transfer die and the suction filtration die are closed, the wet embryo transfer die extrudes the wet embryo on the suction filtration die, extrudes water from the wet embryo, and reduces the water content of the formed wet embryo; through arranging the suction filtration cavity which is inclined downwards from outside to inside on the suction filtration bottom plate, no ponding exists in the suction filtration groove when the vacuum negative pressure device sucks water in the suction filtration bottom plate, and the moisture content of wet embryo during transfer is effectively reduced; in the process of transferring the wet embryo by the wet embryo transfer mold, the water storage tank structure is arranged, so that the blowing device is prevented from blowing air to the wet embryo transfer mold to blow water drops around the top of the air vent to the wet embryo, and the wet embryo is ensured to be maintained in a low water content state. According to the scheme, through the structural design, the moisture content of wet blanks in the production process is effectively reduced, the wet blanks are maintained in a low moisture content state, so that generated scale and slurry scraps are less in the process of baking the wet blanks by closing the hot pressing upper die and the hot pressing lower die, the exhaust holes of the hot pressing lower die are not easy to be blocked, the scale and slurry scraps on the machine frame are also less, the cleaning period of the hot pressing lower die and the machine frame is prolonged, the existing wet pressing plant fiber molding machine needs to be cleaned every two weeks generally, and the plant fiber molding machine of the scheme is cleaned every three months.
In addition, the water content of the wet embryo is low, the heat energy consumption can be reduced, the wet embryo transferring die can move left and right to transfer the wet embryo, the hot pressing die is not moved, and the slurry tank is prevented from being polluted by impurities such as greasy dirt, scrap iron and the like on the hot pressing lower die.
As shown in fig. 12, 13 and 14, the slurry tank 40 includes a tank 401, the tank 401 is provided with a slurry storage tank, the slurry storage tank includes a slurry storage chamber 402 and slurry overflow chambers 403 symmetrically disposed on front and rear sides of the slurry storage chamber 402, the slurry overflow chambers 403 and the slurry storage chamber 402 are separated by a slurry overflow plate 404, left and right ends of the slurry overflow plate 404 are curved to form an arc shape toward one side of the slurry storage chamber 402, lower portions of left and right sidewalls of the tank 401 are respectively provided with a slurry inlet 405, the slurry inlet 405 is communicated with the slurry storage chamber 402, a slurry overflow port 406 is disposed at a position corresponding to the slurry overflow chamber 403 at the bottom of the tank 401, the slurry overflow port 406 is communicated with the corresponding slurry overflow chamber 403, a drain outlet 411 is disposed at the bottom of the tank 401 and is communicated with the slurry storage chamber 402, and the suction filter mold 42 is disposed in the slurry overflow chamber 403.
The height of the headbox 404 is less than the depth of the storage tank. A slurry blocking cover plate 407 is arranged above the slurry overflow chamber 403, the slurry blocking cover plate 407 is connected with the box 401, and the height of the slurry blocking cover plate 407 is higher than the top height of the slurry overflow plate 404. The pulp inlet 405 on the left side wall of the box 401 is located at the front lower part of the left side wall of the box 401, and the pulp inlet on the right side wall of the box 401 is located at the rear lower part of the right side wall of the box 401. The left and right sides symmetry of the bottom surface of pulp storage room 402 is equipped with the gas blow pipe 408, and the both ends of gas blow pipe 408 are equipped with the gas blow port 409, and the middle part of gas blow pipe 408 is equipped with the air inlet, and box 401 bottom is equipped with the air inlet pipeline 410 with the air inlet intercommunication.
The thick liquid gets into the thick liquid room of storing up from the inlet, and thick liquid gets into the thick liquid room from the overflow board upper end after fully leaving the thick liquid room of storing up, later discharges the thick liquid groove device through the overflow mouth, and the inlet is located the side of storing up the thick liquid room, and the side advances thick liquid and is convenient for thick liquid circulation flow in the thick liquid groove, has guaranteed that thick liquid concentration is even, separates through the overflow board between overflow room and the storing up the thick liquid room, and the left and right sides of overflow board is crooked into the arc to storing up thick liquid room one side, and the thick liquid of being convenient for flows, and no dead angle is difficult for the thick liquid of accumulating, prevents that the thick liquid from polluting. And the slurry is blown into the slurry storage chamber through the blowing pipe, so that the slurry can flow circularly. According to different slurry concentrations, the blowing frequency and the time length are reasonably controlled to achieve optimal slurry and reasonable energy consumption.
As shown in fig. 7, the third lifting mechanism 44 includes lifting assemblies symmetrically disposed on the left and right sides of the stock tank 40 and a synchronizing assembly 443 for synchronizing the lifting of the lifting assemblies, the lifting assemblies include a hydraulic cylinder 441 and a connecting member 442, the hydraulic cylinder 441 is vertically disposed, the lifting end of the hydraulic cylinder 441 is connected with the suction filtration die 42 through the connecting member 442, and the two connecting members 442 are connected through the synchronizing assembly 443. The synchronous component enables the two lifting components to synchronously lift, and the stable lifting of the slurry tank is ensured.
The semi-dry pressed plant fiber molding method of the embodiment is used for the semi-dry pressed plant fiber molding machine and comprises the following steps:
s1: the suction filtration die descends into the slurry in the slurry tank to suck the slurry, and after the slurry suction is finished, the suction filtration die ascends to leave the slurry, and wet embryo is formed on the suction filtration die;
s2: the wet embryo transfer die descends and closes the suction filtration die, the wet embryo transfer die extrudes the wet embryo on the suction filtration die to form the wet embryo, meanwhile, the vacuum negative pressure device pumps air to the suction filtration bottom plate to suck away the water extruded by the wet embryo and flowing into the suction filtration bottom plate, the extrusion force of the wet embryo on the suction filtration die extruded by the wet embryo transfer die is 10-16MPa, the extrusion time is 2-4 seconds, and the water content of the wet embryo reaches 58% -63%;
s3: the air extractor is used for extracting air from the wet embryo transfer mould, the wet embryo transfer mould is used for absorbing the formed wet embryo, and meanwhile, moisture and water vapor entering the wet embryo transfer mould in the mould closing process of the wet embryo transfer mould and the suction filtration mould are extracted;
s4: the wet embryo transfer mould moves to the upper part of the hot pressing lower mould at one side along the guide rail, the wet embryo transfer mould descends to the position 0.8-2 mm away from the hot pressing lower mould, the air blowing device blows the wet embryo through the wet embryo transfer mould, and simultaneously the hot pressing lower mould sucks air, and the wet embryo falls onto the hot pressing lower mould from the wet embryo transfer mould;
s5: the wet embryo transfer mould moves to the upper part of the slurry tank along the guide rail to continuously absorb new wet embryo, the hot pressing upper mould above the hot pressing lower mould with the wet embryo descends to be matched with the hot pressing lower mould, the wet embryo is heated and formed into a product, then the hot pressing upper mould ascends, the grabbing mechanism takes away the product, the temperature of the hot pressing lower mould is 160-190 ℃, the temperature of the hot pressing upper mould is 160-190 ℃, the mould matching time is 10-25 seconds, and the water content of the product after the heating and forming is 3% -5%.
In the scheme, when the wet embryo transfer die and the suction filtration die are assembled, the wet embryo transfer die extrudes the wet embryo on the suction filtration die, extrudes moisture from the wet embryo, reduces the moisture content of the formed wet embryo, and simultaneously pumps air to the suction filtration bottom plate when extruding the moisture, so that the moisture extruded from the wet embryo and flowing into the suction filtration bottom plate is sucked away, and the moisture content of the wet embryo is further reduced. When the wet blank transfer mold sucks the formed wet blank, part of the extruded moisture is sucked around the top of the vent hole, and although the air extractor sucks most of the moisture and water vapor in the wet blank transfer mold, part of the moisture remains around the top of the vent hole, in addition, the water vapor content in the blown air is larger, water drops are easily condensed around the top of the vent hole, and the condensed water drops flow into the water storage tank. When the blowing device blows the wet embryo to the hot pressing lower die, the water drops around the top of the vent hole can be blown into the water storage tank when the air blown by the blowing device blows the wet embryo to the top of the vent hole, but the water drops can not be blown into the vent hole, so that the water drops around the top of the vent hole are prevented from being blown to the wet embryo, the water content of the wet embryo is prevented from being improved, and the water in the water storage tank can be pumped away when the air pumping device pumps the wet embryo transfer die. The water content of the wet embryo can be ensured to be maintained in a lower stable state after the treatment of the steps, so that the influence of scale and slurry scraps on a hot pressing lower die and a frame is reduced, and the heat energy consumption is reduced.
And S4, blowing the wet embryo by the wet embryo transfer die, and simultaneously, carrying out vacuum suction on the hot pressing die to ensure that the wet embryo is attached to a die cavity of the hot pressing die when transferred to the hot pressing die. The hot pressing lower die is connected with an external vacuum negative pressure module, and vacuum suction of the vacuum negative pressure module enables the hot pressing lower die to generate suction force on wet blanks above the hot pressing lower die.
Claims (5)
1. The semi-dry pressed plant fiber molding machine is characterized by comprising a frame (1), wherein the frame (1) is provided with a wet embryo transfer device (2), a hot pressing molding device (3) symmetrically arranged at the left side and the right side of the wet embryo transfer device (2) and a pulp dragging device (4) arranged below the wet embryo transfer device (2), the wet embryo transfer device (2) comprises a bracket (21), a wet embryo transfer die (22) arranged on the bracket (21) and a first lifting mechanism (23) for driving the wet embryo transfer die (22) to lift along the bracket (21), the hot pressing molding device (3) comprises a hot pressing upper die (31), a hot pressing upper die (32) and a second lifting mechanism (33) for driving the hot pressing upper die (32) to lift, the pulp dragging device (4) comprises a pulp tank (40), a suction filter die (42) arranged in the pulp tank (40) and a third lifting mechanism (44) for driving the suction filter die (42), the frame (1) is further provided with a first lifting mechanism (23) for driving the wet embryo transfer die (22) to lift along the bracket (21), the left guide rail (5) is further provided with a second lifting mechanism (33) for driving the hot pressing upper die (32) to lift along the guide rail (6) and a sliding mechanism (6) which can be connected with the guide rail (6) in a sliding way, the wet embryo transfer die (22) can move along the guide rail (5) between the upper part of the left hot pressing lower die, the upper part of the slurry tank and the upper part of the right hot pressing lower die; the wet blank transfer die (22) comprises a first plate body (221) and a cover plate (222), wherein a plurality of downward protruding wet blank forming surfaces (223) are arranged on the bottom surface of the first plate body (221), an air ring (224) is arranged on the outer edge of the wet blank forming surfaces (223), the air ring (224) is formed by a plurality of air holes (225) which are arrayed and encircled along the outer edge of the wet blank forming surfaces (223) to form a ring shape, grooves (228) are formed in the top surface of the first plate body (221) and correspond to the wet blank forming surfaces (223), the tops of the air ring (224) are located in the corresponding grooves (228), a water storage groove (226) is formed in the groove (228), the water storage groove (226) is located inside the air ring (224) corresponding to the wet blank forming surfaces (223), the plane where the tops of the air ring (224) are located is connected with the corresponding water storage groove (226) through downward inclined annular inclined planes (227), the cover plate (222) covers the top surface of the first plate body (221), and the cover plate (222) is provided with air channels (228) communicated with the grooves (228);
the suction filtration die (42) comprises a suction filtration bottom plate (421) and a suction filtration die core (422) arranged above the suction filtration bottom plate (421), the suction filtration bottom plate (421) comprises a second plate body (423), suction filtration grooves (424) are formed in the top surface of the second plate body (423), a plurality of suction filtration cavities (425) are uniformly distributed on the bottom surface of the suction filtration grooves (424), suction filtration holes (426) are formed in the centers of the suction filtration cavities (425), a baffle (427) which is horizontally arranged is further arranged above the suction filtration cavities (425), the baffle (427) is located right above the suction filtration holes (426), a suction pipe (428) communicated with the suction filtration holes (426) is arranged on the bottom surface of the second plate body (423), and the suction filtration cavities (425) incline downwards from outside to inside;
the slurry tank (40) comprises a tank body (401), the tank body (401) is provided with a slurry storage tank, the slurry storage tank comprises a slurry storage chamber (402) and slurry overflow chambers (403) symmetrically arranged on the front side and the rear side of the slurry storage chamber (402), the slurry overflow chambers (403) are separated from the slurry storage chamber (402) through slurry overflow plates (404), the left end and the right end of each slurry overflow plate (404) are bent to form an arc shape towards one side of the slurry storage chamber (402), the lower parts of the left side wall and the right side wall of the tank body (401) are respectively provided with a slurry inlet (405), the slurry inlets (405) are communicated with the slurry storage chamber (402), slurry overflow ports (406) are arranged at positions, corresponding to the slurry overflow chambers (403), of the bottom of the tank body (401), the slurry overflow chambers (403) are communicated with the corresponding slurry overflow chambers (403), and the suction filtration dies (42) are positioned in the slurry overflow chambers (403).
The left and right sides symmetry of pulp storage room (402) bottom surface is equipped with gas blow pipe (408), the both ends of gas blow pipe (408) are equipped with gas blow port (409), the middle part of gas blow pipe (408) is equipped with the air inlet, box (401) bottom is equipped with air inlet pipeline (410) with the air inlet intercommunication.
2. A semi-dry pressed plant fiber molding machine as claimed in claim 1, wherein adjacent grooves (228) are connected by connecting grooves (229).
3. The semi-dry pressed plant fiber molding machine as claimed in claim 1, wherein the third elevating mechanism (44) comprises elevating components symmetrically arranged at the left and right sides of the slurry tank (40) and synchronizing components (443) for synchronizing the elevating components, the elevating components comprise hydraulic cylinders (441) and connecting pieces (442), the hydraulic cylinders (441) are vertically arranged, elevating ends of the hydraulic cylinders (441) are connected with the suction filtration mold (42) through the connecting pieces (442), and the two connecting pieces (442) are connected through the synchronizing components (443).
4. A semi-dry pressed vegetable fiber molding method for a semi-dry pressed vegetable fiber molding machine as claimed in any one of claims 1 to 3, comprising the steps of:
s1: the suction filtration die descends into the slurry in the slurry tank to suck the slurry, and after the slurry suction is finished, the suction filtration die ascends to leave the slurry, and wet embryo is formed on the suction filtration die;
s2: the wet embryo transfer die descends and closes the suction filtration die, the wet embryo transfer die extrudes the wet embryo on the suction filtration die to form the wet embryo, and meanwhile, the suction filtration bottom plate is pumped, and the water extruded by the wet embryo and flowing into the suction filtration bottom plate is sucked away;
s3: pumping air from the wet embryo transfer mould, sucking the formed wet embryo by the wet embryo transfer mould, and pumping water and vapor entering the wet embryo transfer mould in the mould closing process of the wet embryo transfer mould and the suction filtration mould;
s4: the wet embryo transfer mould moves to the upper part of the hot pressing lower mould at one side along the guide rail, the wet embryo transfer mould descends to the position 0.8-2 mm away from the hot pressing lower mould, the wet embryo transfer mould blows the wet embryo, and simultaneously the hot pressing lower mould sucks air, and the wet embryo falls onto the hot pressing lower mould from the wet embryo transfer mould; ensuring that the wet embryo is attached to the hot lower die cavity;
s5: the wet embryo transfer mould moves to the upper part of the slurry tank along the guide rail to continuously absorb new wet embryo, the hot pressing upper mould above the hot pressing lower mould with the wet embryo descends to be matched with the hot pressing lower mould, the wet embryo is heated and formed into a product, and then the hot pressing upper mould ascends to be taken away by the grabbing mechanism.
5. The molding method of semi-dry pressed plant fiber according to claim 4, wherein the pressing force of the wet embryo transfer mold pressing the wet embryo on the suction filtration mold in the step S2 is 10-16MPa, and the pressing time is 2-4 seconds, so that the moisture content of the wet embryo reaches 58% -63%.
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