CN114986846A

CN114986846A - Polyethylene foaming extrusion molding device and method

Info

Publication number: CN114986846A
Application number: CN202210586376.XA
Authority: CN
Inventors: 张加苗; 王玉坡; 王雪; 代明友
Original assignee: Anhui Daijia Technology Co ltd
Current assignee: Anhui Daijia Technology Co ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-09-02
Anticipated expiration: 2042-05-27
Also published as: CN114986846B

Abstract

The invention provides a polyethylene foaming extrusion molding device and a method, wherein the device supports a unit; the melting unit is used for heating the particle materials into molten materials and is arranged at the top of the supporting unit; the extrusion unit is used for extruding and molding the molten material and is arranged at the bottom of the molten material unit; the extrusion unit comprises an extrusion screw rod for conveying melt materials, and the extrusion screw rod is arranged inside the extrusion unit; the control unit is used for pushing the melt in the extrusion unit and is arranged on the side part of the extrusion unit. The melt material is inflated to flow back and is periodically transmitted and pushed along with the rising of the moving pipe through the rising leveling state of the pushing table, and the melt material is not driven to flow back along with the falling of the moving pipe in the descending folding state of the pushing table, so that the multiple inflation and backflow states of the melt material are reduced, and the circulating aging times of the melt material are reduced.

Description

Polyethylene foaming extrusion molding device and method

Technical Field

The invention relates to the technical field of polyethylene foaming, in particular to a polyethylene foaming extrusion molding device and a polyethylene foaming extrusion molding method.

Background

Polyethylene, also called PE, is a thermoplastic resin obtained by polymerizing ethylene, and has a wide prospect in practical production and application, for example, polyethylene can be used as a matching plate in the process of assembling furniture, or as a ground mat, or as an important accessory of assembling artworks in the application of furniture and artworks, and PE can be produced by physical extrusion foaming, i.e. inert gas is dissolved in plastic melt or paste under pressure, and then the gas is released under reduced pressure, so that pores are formed in the plastic to foam.

Chinese patent CN208914556U discloses an extrusion equipment for improving fire resistance of polyethylene chemical crosslinking foaming material, which comprises a main body, the externally mounted of main part has the shell, the upper end of shell is provided with the feed inlet, the one end of shell is provided with the hydraulic stem, and the one end of hydraulic stem is provided with the expansion plate, the below of hydraulic stem is provided with the motor, the internally mounted of main part has spiral propelling movement pole, all install the heating pipe on the two relative inner walls of main part, install the cooling plate on one side inner wall of main part, the inside of cooling plate is provided with extrudes the mouth, the below of spiral propelling movement pole is provided with the ventilation groove, and the one end in ventilation groove installs the fan of blowing, the suction fan is installed to the other end in ventilation groove, be provided with the fin between fan of blowing and the suction fan, the base is installed to the bottom of main part. The utility model discloses extrude evenly, effective heat dissipation when spiral propelling movement pole works, the cooling is effectual, prevents that the high temperature from leading to the machine to damage.

However, the following problems exist in this type of apparatus:

1. in practical use, when the equipment is used for physical foaming, inert gas needs to be mixed into a melt, and then the inert gas is dissolved in the melt through the rotation transmission of the screw, but in the transmission of the inert gas through the screw, if the rotation transmission time is short, the mixing is not uniform, and if the time is long, the melt is aged, so that the forming quality of pe foaming is affected;

2. and in filling inert gas, can make the melt produce the backward flow under gas impact, and then can contain the long-term melt material that exists of backward flow of the small part in the melt that leads to the backward flow, this part material can exist the overlength time under the influence of backward flow in the inside of machine section of thick bamboo promptly and circulate many times, and then can lead to this part melt material to produce ageing, influences pe foaming's shaping quality.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a polyethylene foaming extrusion molding device, which can periodically transmit and push the inflation backflow of a melt material along with the rising of a moving pipe through the rising and leveling state of a pushing table, and the melt material cannot be driven to backflow along with the falling of the moving pipe in the descending and folding state of the pushing table, so that the multiple inflation backflow state of the melt material is reduced, and the cyclic aging times of the melt material are reduced.

In order to achieve the purpose, the invention provides the following technical scheme:

a polyethylene foaming extrusion molding device comprises:

a support unit;

the melting unit is used for heating the particle materials into molten materials and is arranged at the top of the supporting unit;

the extrusion unit is used for extruding and molding the molten material and is arranged at the bottom of the molten material unit;

the extrusion unit comprises an extrusion screw rod for conveying melt materials, the extrusion screw rod is arranged inside the extrusion unit, a pushing table for pushing the melt materials forwards is arranged inside the extrusion screw rod, the bottom surface of the pushing table is movably connected with a moving pipe through a middle rod, a connecting plate is arranged on the side part of the middle rod, and the connecting plate is used for controlling the pushing table to move forwards, horizontally push and fold backwards;

the control unit is used for pushing the melt in the extrusion unit and is arranged on the side part of the extrusion unit.

Preferably, the connecting plates are symmetrically distributed along the center line of the movable pipe, the bottom of the symmetrically distributed movable pipe is respectively provided with an adjusting rod and a driven rod, and the bottom of the pushing platform is movably connected with the mounting groove of the movable pipe through the center rod;

the inner side of the top of the extrusion screw is provided with an ejection column, and the ejection column is connected with the extruder head through the extrusion screw.

Preferably, the extrusion unit further comprises a gas input unit, and the gas input unit is respectively connected with the extrusion unit and the control unit in a conduction mode through gas input pipes;

the surface that removes the pipe has the air vent along its axial evenly distributed, air vent and one-way breather pipe turn-on connection, one-way breather pipe sets up in the inside that removes the pipe, one-way breather pipe's inside is equipped with the diaphragm that the surface was seted up there is the gas pocket, the lateral part of diaphragm is through the inner wall welding of restriction curb plate and one-way breather pipe, one side that the inside wall of removal pipe was kept away from to the restriction curb plate is equipped with the bevel connection, bevel connection and one-way piece cooperate, one-way piece is through even piece of elasticity and diaphragm elastic connection.

Preferably, the control unit comprises an extrusion power unit, the extrusion power unit is arranged at the top of the support unit, the extrusion power unit is in transmission connection with the driving disc through an output shaft of the extrusion power unit, and the top of the driving disc is in transmission connection with the driven disc;

the lateral part that the unit was extruded to the driven plate was kept away from is equipped with protruding ring, the inboard transmission of protruding ring inner wall is connected with at least a set of internal linkage wheel, the central activity joint of driven plate has the inner disc, remove pipe, adjusting lever and driven lever respectively with the corresponding through-hole sliding connection on inner disc surface, the top of driven plate is equipped with a plurality of raised plate.

Preferably, the inner connecting wheels are symmetrically arranged on the center line of the moving pipe, the inner connecting wheels are respectively in transmission connection with a primary cam cylinder and a secondary cam cylinder through penetrating columns, a primary spiral groove is formed on the surface of the primary cam cylinder in a surrounding mode, and a secondary spiral groove is formed on the surface of the secondary cam cylinder in a surrounding mode;

the second grade helicla flute is connected through adjustment gangbar and sleeve board and adjusting lever, the bottom of removing the pipe is equipped with the middle part gangbar, the driven lever is through its bottom lantern ring and removal pipe sliding connection, the upper and lower both sides of the lantern ring are equipped with a limiting cylinder and bullet piece respectively, the upper and lower both sides of bullet piece are equipped with the lantern ring and sleeve board respectively, the one-level helicla flute is connected through main gangbar and one-level cam cylinder transmission.

Preferably, the sleeve plate is sleeved on the surface of the moving pipe, a ring plate is arranged at the bottom of the sleeve plate and sleeved on the surface of the moving pipe, and the ring plate is elastically connected with the middle linkage plate through elastic units arranged around the ring plate;

the one-level helicla flute is through aerifing link rod and aerifing support column sliding connection, the inner wall at the control unit is connected to the bottom of aerifing the support column, it has the inflation stopper to aerify the fixed cover of having connect in one side that the one-level cam cylinder was kept away from to the link rod.

Preferably, the inflation plug is movably connected with the inflator through a vent plate, the inflator is movably and hermetically connected with the movable pipe through a sealing cavity, and the gas input pipe is in conductive connection with the inner wall of the inflator;

the inner disc is fixedly connected with the inner wall of the control unit through the disc column, and the specification of the second-stage spiral groove is double that of the first-stage spiral groove.

Preferably, the supporting unit comprises moving wheels, at least one group of moving wheels is arranged at the bottom of the supporting unit, a fixed seat is arranged on the inner side of each moving wheel, and a supporting frame is arranged at the top of the supporting unit;

the support frame supports and sets up in the bottom of melt unit and extrusion platen, the extrusion platen is through fixed backplate and control unit and extrude the power unit welding.

Preferably, the melting unit comprises a power unit, the power unit passes through a linkage unit and a transmission screw, and a melting barrel is arranged outside the transmission screw;

the melt barrel is in conduction connection with the extrusion unit through a feed opening, the transmission screw is in conduction connection with the material control opening through a conveying opening at the top of the transmission screw, a linkage box is arranged on the outer side of the linkage unit, and a cover plate is arranged on the outer side of an output shaft of the power unit.

The invention also provides a production method for performing polyethylene foam molding by using the polyethylene foam extrusion molding device, which comprises the following steps:

step one, gravity feeding: the particle materials in the bin fall into the melting barrel under the gravity traction;

step two, melting the cylinder: the heating unit controls the heating cover to heat, so that the melting barrel connected with the heating cover is heated, and the particle materials in the melting barrel are heated to a melting state;

step three, foaming treatment: the melt in the melt machine barrel falls into the extrusion unit under the transmission of the transmission screw and then inert gas is input to the outer side of the melt material through the gas input pipe;

step four, pressurizing and inflating: under the extrusion and inflation of the inflation plug, inert gas in the moving pipe can be input into the melt material through the vent hole;

step five, periodically pushing and stirring: the pushing table is horizontally pushed forward and folded backward so that the inert gases on the inner side and the outer side of the solution material are pushed and mixed;

step six, extrusion molding: the extrusion screw and the ejection column convey the melt material mixed with the inert gas, so that the conveyed material is extruded and molded by the extruder head.

The invention has the beneficial effects that:

(1) the inner linked wheel respectively drives the driving link rod and the adjusting link rod connected with the inner linked wheel to slide up and down through the primary spiral groove and the secondary spiral groove arranged on the surface of the inner linked wheel, so that the rising flat state of the pushing table can carry out periodic transmission pushing on the air inflation backflow of the melt material along with the rising of the moving pipe, and the falling folded state of the pushing table can not drive the melt material to backflow along with the falling of the moving pipe, thereby reducing the state of multiple air inflation backflow of the melt material and reducing the cycle aging times of the melt material.

(2) The invention arranges the hollow moving pipe in the melt material, the gas input pipe is respectively connected to the inside of the extrusion unit and the inside of the inflator connected with the moving pipe, the hollow moving pipe injects inert gas from the inside of the melt material to the outside through the one-way vent pipe and the vent hole, and then the contact probability of the whole melt material and the inert gas can be improved through the input of the inert gas at the inner side and the outer side, the mixing efficiency is improved, the ascending and unfolding pushing platform can fully push and disperse the inert gas at the inner side to the inside of the melt material in the ascending and the expanding process, the foaming uniformity degree of the material is improved, the inflation link rod is inserted into the inner part of the first-level spiral groove through the inserted rod, the inflation link rod moves up and down along with the first-level spiral groove, the inflation plug connected with the inflation link rod can inflate the inside of the inflator in the up and down movement, the inert gas in the moving pipe is conveniently flushed into the melt material under the filling of the external inflation, and the mixing degree of the inert gas and the material is improved.

(3) The one-way vent pipe is obliquely arranged along the conveying direction of the extrusion screw, and the one-way block and the limiting side plate which play a one-way blocking role towards the inner side of the moving pipe outside the moving pipe are arranged in the one-way vent pipe, so that the melt material outside the moving pipe can be effectively reduced from flowing into the moving pipe, and the service life of the equipment is prolonged.

In conclusion, the invention has the advantages of uniform inert gas mixing and less aging reflux.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a melt unit;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is an enlarged schematic view of portion B of FIG. 2;

FIG. 5 is an enlarged schematic view of portion C of FIG. 4;

FIG. 6 is a schematic view of an extrusion unit structure;

FIG. 7 is an enlarged view of portion D of FIG. 6;

FIG. 8 is an enlarged view of section E of FIG. 6;

FIG. 9 is an enlarged view of portion F of FIG. 8;

FIG. 10 is a schematic view of the inner plate structure;

FIG. 11 is a schematic view of the connection of the driven disk and the inner disk;

FIG. 12 is a schematic view of the inner structure of the moving pipe;

FIG. 13 is a schematic view of the internal structure of the one-way vent pipe;

FIG. 14 is a process flow diagram of the present invention.

In the figure:

1. a support unit; 101. a moving wheel; 102. a fixed seat; 103. a support frame; 1031. a barrel support leg; 1032. extruding a platen; 10321. fixing the back plate;

2. a melt unit; 201. a power unit; 202. a cover plate; 2021. a linkage box; 20211. a linkage unit; 20212. a drive screw; 2022. a melt barrel; 2023. a feeding port; 203. a storage bin; 2031. a material control port; 20311. a control panel; 2032. a conveying material port; 204. a heating unit; 2041. a wire; 2042. a heating mantle;

3. an extrusion unit; 301. a gas input unit; 3011. a gas input pipe; 3012. a barometer; 302. extruding a screw; 3021. ejecting the column; 3022. extruding a machine head; 303. moving the tube; 3031. mounting grooves; 30311. a middle rod; 30312. a pushing table; 30313. connecting plates; 30314. an adjusting lever; 30315. a driven lever; 30316. a spring block; 30317. a restraining cylinder; 3032. sealing the cavity; 3033. a one-way vent pipe; 30331. a unidirectional block; 30332. elastic connecting blocks; 30333. a transverse plate; 30334. a limiting side plate; 304. a vent hole;

4. a control unit; 401. an extrusion power unit; 4011. a driving disk; 4012. a housing; 4013. a driven plate; 40131. a raised ring; 4014. an inner disc; 40141. a disc column; 40142. a raised sealing ring; 40143. a scraper sealing ring; 402. a raised plate; 4021. a balancing head; 403. an inline wheel; 4031. penetrating the column; 4032. a primary cam cylinder; 40321. a secondary cam cylinder; 4033. a first-stage spiral groove; 40331. a secondary spiral groove; 404. adjusting the linkage rod; 4041. a sleeve plate; 405. a main link rod; 4051. a middle linkage plate; 4052. an elastic unit; 4053. a ring plate; 406. an inflation link; 4061. an inflatable support column; 4062. an inflation plug; 407. an inflator; 4071. and (7) a breathable plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example one

As shown in fig. 1 to 4 and fig. 7 to 8, the present embodiment provides a polyethylene foam extrusion molding apparatus, including:

a support unit 1;

the melting unit 2 is used for heating the particle materials into the melting materials, and the melting unit 2 is arranged on the top of the supporting unit 1;

the extrusion unit 3 is used for extruding and molding the melt, and the extrusion unit 3 is arranged at the bottom of the melt unit 2;

the extrusion unit 3 comprises an extrusion screw 302 for conveying a melt material, the extrusion screw 302 is arranged inside the extrusion unit 3, a pushing table 30312 for pushing the melt material forwards is arranged inside the extrusion screw 302, the bottom surface of the pushing table 30312 is movably connected with a moving pipe 303 through a middle rod 30311, a connecting plate 30313 is arranged on the side of the middle rod 30311, and the connecting plate 30313 is used for controlling the pushing table 30312 to perform forward horizontal pushing and backward folding;

a control unit 4, wherein the control unit 4 for pushing the melt inside the extrusion unit 3 is arranged at the side part of the extrusion unit 3.

The connecting plates 30313 are symmetrically distributed along the center line of the moving pipe 303, the bottom of the moving pipe 303 which is symmetrically distributed is provided with an adjusting rod 30314 and a driven rod 30315 respectively, the bottom of the pushing table 30312 is movably connected with the mounting groove 3031 of the moving pipe 303 through a middle rod 30311, the mounting groove 3031 of the moving pipe 303 is connected with the middle rod 30311 through a threaded through hole of a screw rod, and the middle rod 30311 is movably sleeved on the outer side of the screw rod;

the inner side of the top of the extrusion screw 302 is provided with an ejection column 3021, the ejection column 3021 is connected with the extruder head 3022 through the extrusion screw 302, the extrusion screw 302 is preferably of a hollow spiral structure, and the bottom of the extrusion screw 302 is connected to the surface of the driven disc 4013, so that the driven disc 4013 drives the extrusion screw 302 to perform rotary motion.

The extrusion unit 3 further comprises a gas input unit 301, and the gas input unit 301 is respectively connected with the extrusion unit 3 and the control unit 4 in a conduction mode through a gas input pipe 3011; the gas input unit 301 is preferably an inert gas inflator;

vent holes 304 are uniformly distributed on the surface of the moving pipe 303 along the axial direction, the vent holes 304 are in conduction connection with a one-way vent pipe 3033, the one-way vent pipe 3033 is arranged inside the moving pipe 303, a transverse plate 30333 with air holes on the surface is arranged inside the one-way vent pipe 3033, the side part of the transverse plate 30333 is welded with the inner wall of the one-way vent pipe 3033 through a limiting side plate 30334, an inclined opening is arranged on one side, away from the inner wall of the moving pipe 303, of the limiting side plate 30334, the inclined opening is matched with a one-way block 30331, the one-way block 30331 is elastically connected with the transverse plate 30333 through an elastic connecting block 30332, and the elastic connecting block 30332 is preferably an elastic rubber block or a spring.

What needs to be supplemented is: the hollow moving pipe 303 is arranged in the melt material, the gas input pipe 3011 is respectively connected to the inside of the extrusion unit 3 and the inside of the inflator 407 connected with the moving pipe 303, the inert gas is poured out from the inside of the melt material through the one-way vent pipe 3033 and the vent hole 304 by the hollow moving pipe 303, and then the contact probability of the whole melt material and the inert gas can be improved through the input of the inert gas at the inner side and the outer side, the mixing efficiency is improved, and the lifting and unfolding pushing table 30312 can fully push and disperse the inert gas at the inner side to the inside of the melt material in the lifting movement to improve the foaming uniformity degree of the material.

The inflation link 406 is inserted into the primary spiral groove 4033 through the insertion rod, so that the inflation link 406 moves up and down along with the primary spiral groove 403, and the inflation plug 4062 connected with the inflation link 406 inflates the interior of the inflator 407 during the up and down movement, so that the inert gas in the moving pipe 303 is fully flushed into the melt material under the filling of the additional inflation, and the mixing degree of the inert gas and the material is improved.

By obliquely arranging the one-way vent pipe 3033 along the conveying direction of the extrusion screw 302 and combining the one-way block 30331 and the limiting side plate 30334 which play a one-way blocking role on the outer side of the moving pipe 303 to the inner side of the moving pipe 303 in the one-way vent pipe 3033, the inflow of the melt material on the outer side of the moving pipe 303 into the moving pipe 303 can be effectively reduced, so that the service life of the equipment is prolonged.

As shown in fig. 5-10, the control unit 4 includes an extrusion power unit 401, the extrusion power unit 401 is disposed on the top of the support unit 1, the extrusion power unit 401 is preferably a three-phase asynchronous speed reduction motor, the extrusion power unit 401 is in transmission connection with a driving disk 4011 through an output shaft thereof, and a driven disk 4013 is in transmission connection with the top of the driving disk 4011; the driving disc 4011 and the driven disc 4013 are preferably gears;

the side part of the driven disc 4013, which is far away from the extrusion unit 3, is provided with a raised ring 40131, the inner side of the inner wall of the raised ring 40131 is in transmission connection with at least one group of internal linkage wheels 403, the number of the internal linkage wheels 403 is two, the inner side of the raised ring 40131 is provided with teeth, the internal linkage wheels 403 are preferably gears, the internal linkage wheels 403 are in meshing connection with the teeth of the raised ring 40131, the center of the driven disc 4013 is movably clamped with an internal disc 4014, so that the internal disc 4014 does not move along with the driven disc 4013, the moving pipe 303, the adjusting rod 30314 and the driven rod 30315 are respectively in sliding connection with corresponding through holes on the surface of the internal disc 4014, the top part of the driven disc 4013 is provided with a plurality of raised plates 402, and the top parts of the raised plates 402 are provided with balance heads 4021,

it should be noted that: the balance head 4021 is arranged on the inner side of the extrusion screw 302, and rotates along with the driven disc 4013 when the balance head 4021, so that when the gas input of the gas input pipe 3011 is too large, the balance head 4021 can drive the material to perform transverse impact, and the rotating balance head 4021 can rotate and convert the melt material of the transverse impact inside the hollow extrusion screw 302, so that the transverse impact stroke of the material is reduced, and the multiple-circulation material is prevented from sinking.

Outer covers 4012 are arranged on the outer sides of the driving disc 4011 and the driven disc 4013, the internal linkage wheels 403 are symmetrically arranged on the center line of the moving pipe 303, the internal linkage wheels 403 are respectively in transmission connection with a primary cam cylinder 4032 and a secondary cam cylinder 40321 through a penetrating column 4031, the bottom of the penetrating column 4031 is in rotary connection with the inner wall of the control unit 4 through a bearing, a primary spiral groove 4033 is formed in the surface of the primary cam cylinder 4032 in a surrounding mode, and a secondary spiral groove 40331 is formed in the surface of the secondary cam cylinder 40321 in a surrounding mode;

the secondary spiral groove 40331 is connected with a sleeve plate 4041 and an adjusting rod 30314 through an adjusting linkage rod 404, a middle linkage plate 4051 is arranged at the bottom of the moving pipe 303, the driven rod 30315 is connected with the moving pipe 303 in a sliding mode through a bottom sleeve ring of the driven rod 30315, a limiting cylinder 30317 and a spring block 30316 are arranged on the upper side and the lower side of the sleeve ring respectively, the upper side and the lower side of the spring block 30316 are provided with the sleeve ring and the sleeve plate 4041 respectively, the limiting cylinder 30317 and the spring block 30316 are preferably made of elastic rubber materials and play a role in supporting and limiting the running stroke of the sleeve ring and the sleeve plate 4041, the primary spiral groove 4033 is in transmission connection with the primary cam cylinder 4032 through the main linkage rod 405, and the lengths of the driven rod 30315 and the adjusting rod 30314 are inconsistent.

The sleeve plate 4041 is sleeved on the surface of the moving pipe 303, a ring plate 4053 is arranged at the bottom of the sleeve plate 4041, the ring plate 4053 is sleeved on the surface of the moving pipe 303, the ring plate 4053 is elastically connected with the middle linkage plate 4051 through an elastic unit 4052 arranged around the ring plate 4053, and the elastic unit 4052 is preferably a spring;

the primary spiral groove 4033 is connected with an inflation support column 4061 in a sliding mode through an inflation link 406, the bottom of the inflation support column 4061 is connected to the inner wall of the control unit 4, the inflation support column 4061 is connected with the inflation link 406 in a sliding mode through a sleeve ring on the top of the inflation support column 4061, the inflation link 406 is in a Z shape, and an inflation plug 4062 is fixedly sleeved on one side, far away from the primary cam cylinder 4032, of the inflation link 406.

The inflation plug 4062 is movably connected with the inflator 407 through a ventilation plate 4071, air holes are uniformly distributed on the surface of the ventilation plate 4071, the inflator 407 is movably and hermetically connected with the moving pipe 303 through a sealing cavity 3032, a sealing ring is arranged at the connection position of the sealing cavity 3032 and the inflator 407, the gas input pipe 3011 is in conduction connection with the inner wall of the inflator 407, and a barometer 3012 is arranged on the surface of the gas input pipe 3011 in conduction;

the inner disc 4014 is fixedly connected with the inner wall of the control unit 4 through a disc column 40141, the specification of the second-stage spiral groove 40331 is double that of the first-stage spiral groove 4033, the second-stage spiral groove 40331 and the first-stage spiral groove 4033 are both formed by two flat rails and two inclined rails, an inclined rail is arranged between the two flat rails, the movement strokes of the inclined rail and the flat rail of the first-stage spiral groove 4033 are equal to the movement stroke of a single inclined rail or a single flat rail of the second-stage spiral groove 4033, a protruding sealing ring 40142 is movably arranged at the joint of the moving tube 303, the adjusting rod 30314, the driven rod 30315 and the inner disc 4014, and scraper sealing rings 40143 are respectively arranged at one side of the moving tube 303, the adjusting rod 30314 and the driven rod 30315 close to the extrusion screw 302 and at the outer side of the joint of the inner disc 4014. The scraper sealing ring 40143 is preferably made of hard rubber material, so that a double-layer sealing structure can conveniently perform sliding sealing on the joint of the moving pipe 303, the adjusting rod 30314, the driven rod 30315 and the inner disc 4014, and the scraper sealing ring 40143 can scrape off the molten material on the sliding surfaces of the moving pipe 303, the adjusting rod 30314 and the driven rod 30315, so as to prevent the molten material on the surfaces from falling into the inner part of the convex sealing ring 40142;

it should be noted that: the adjusting linkage rod 404, the driving link rod 405 and the inflating link rod 406 are respectively connected with the second-stage spiral groove 40331 and the first-stage rotary groove 4033 in a sliding manner through the inserted rod, the driving disc 4011 and the driven disc 4013 move along with the inserted rod through the driving of the extrusion power unit 401, the driven disc 4013 rotates through the raised ring 40131 connected with the driven disc, the rotating inner link wheel 403 drives the driving link rod 405 and the adjusting linkage rod 404 connected with the rotating inner link wheel through the first-stage spiral groove 4033 and the second-stage spiral groove 40331 arranged on the surface of the rotating inner link wheel to respectively move in a sliding manner up and down, the up and down movement of the driving link rod 405 drives the middle linkage plate 4051 and the moving pipe to move up and down, when the adjusting linkage rod 404 moves up, the sleeve plate 4041 at the bottom of the adjusting linkage rod slides up along the surface of the moving pipe 303, and at the same time, one side of the pushing table 30312 connected with the top of the adjusting linkage rod 404 through the connecting plate 30313 rises up, then, through the movable design of the middle part of the pushing table 30312, the other side of the pushing table 30312 descends, and meanwhile, the driven rod 30315 at the bottom of the pushing table 30312 is pushed to descend downwards, so that the collar connected with the bottom of the driven rod 30315 slides downwards along the surface of the moving pipe 303, at the moment, the ascending of one side and the descending of the other side can fold and retract the pushing table 30312, when the adjusting linkage rod 404 moves downwards, the moving direction of the process is opposite, but the pushing table 30312 is in the folded and retracted state again, when the adjusting linkage rod 404 moves upwards and downwards, the adjusting linkage rod 404 is in the inclined rail state of the secondary spiral groove 40331,

when the adjusting linkage rod 404 is in the flat rail state of the secondary spiral groove 40331, the pushing table 30312 is restored to the flat state, and the secondary spiral groove 40331 is designed to be twice the movement stroke of the primary spiral groove 4033, when the active link rod 405 is in the inclined groove and the flat rail after the ascending stage of the primary spiral groove, the moving tube 303 is in the ascending stage and the ascending intermittent rotation stage, the adjusting linkage rod 404 is in the flat rail stage of the secondary spiral groove 40331, when the active link rod 405 is in the inclined groove and the flat rail after the descending stage of the primary spiral groove, the moving tube 303 is in the descending stage and the descending intermittent rotation stage, the adjusting linkage rod 404 is in the inclined rail stage of the secondary spiral groove 40331, that is, when the active link rod 405 is in the inclined groove and the flat rail after the ascending stage of the secondary spiral groove, the moving tube 303 and the pushing table 30312 at the top thereof are driven to move forward to approach the extrusion head 3022, in the process, the adjusting linkage rod 404 is located in a flat rail state of the secondary cam cylinder 40321, namely, the pushing table 30312 is flat when ascending and is contracted when descending, the ascending flat state of the pushing table 30312 can carry out periodic transmission pushing on the inflation backflow of the melt material along with the ascending of the moving pipe 303, and the descending folded state of the pushing table 30312 cannot drive the melt material to backflow along with the descending of the moving pipe 303, so that the state of multiple inflation backflow of the melt material is reduced, and the cycle aging times of the melt material are reduced.

As shown in fig. 1-4, the supporting unit 1 includes moving wheels 101, at least one set of moving wheels 101 is provided at the bottom of the supporting unit 1, the number of the moving wheels 101 is eight, a fixed seat 102 is provided at the inner side of the moving wheels 101, and a supporting frame 103 is provided at the top of the supporting unit 1;

the supporting frame 103 is supported and arranged at the bottom of the melting unit 2 and the extrusion platen 1032, the bottom plate of the melting barrel 2022 is provided with barrel supporting legs 1031 for supporting, and the extrusion platen 1032 is welded by a fixed back plate 10321, the control unit 4 and the extrusion power unit 401.

The melting unit 2 comprises a power unit 201, the power unit 201 is preferably a three-phase asynchronous speed reducing motor, the power unit 201 is composed of a linkage unit 20211 and a transmission screw 20212, the linkage unit 20211 is preferably a belt and a synchronous wheel, the synchronous wheel is arranged on one side of an output shaft of the power unit 201 and the transmission screw 20212 close to the power unit 201, the two synchronous wheels are linked through the belt, and a melting barrel 2022 is arranged on the outer side of the transmission screw 20212;

the melt machine barrel 2022 is in conduction connection with the extrusion unit 3 through a feed opening 2023, the transmission screw 20212 is in conduction connection with a material control opening 2031 through a conveying material opening 2032 at the top of the transmission screw 20212, a control plate 20311 for drawing and controlling the feeding of the feed bin 203 is arranged in the middle of the material control opening 2031, a linkage box 2021 is arranged on the outer side of the linkage unit 20211, and a cover plate 202 is arranged on the outer side of an output shaft of the power unit 201. The outer sides of the melting barrel 2022 and the extrusion unit 3 are both provided with heating covers 2042, the heating covers 2042 are electrically connected with the heating unit 204 through wires 2041, the inner side of the heating cover 2042 is provided with resistance wires, the heating unit 204 is preferably a power supply unit, the resistance wires are powered and heated by the power supply unit, the resistance wires dissolve and heat particles in the melting barrel 2022, and the particles are heated and dissolved into a melt.

Example two

As shown in fig. 14, the present embodiment provides a polyethylene foaming extrusion molding method, which includes the following steps:

step one, gravity feeding: the particulate material inside the silo 203 falls under gravity pull to the inside of the melt barrel 2022;

step two, melting the cylinder: the heating unit 204 controls the heating cover 2042 to heat, so that the melting barrel 2022 connected with the heating cover 2042 is heated, and the granular material inside the melting barrel 2022 is heated to a molten state;

step three, foaming treatment: the melt in the melt barrel 2022 falls into the extrusion unit 3 under the transmission of the transmission screw 20212 and inert gas is input to the outside of the melt material through the gas input pipe 3011;

step four, pressurizing and inflating: the extrusion of the inflating plug 4062 is inflated, so that the inert gas in the moving pipe 303 can be input into the melt material through the vent hole 304;

step five, periodically pushing and stirring: the pushing table 30312 is pushed forward and horizontally and folded backward so that the inert gases on the inner side and the outer side of the solution material are pushed and mixed;

step six, extrusion molding: the extrusion screw 302 and the ejector column 3021 convey the melt material mixed with the inert gas, and the conveyed material is extruded by the extruder head 3022.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A polyethylene foaming extrusion molding device is characterized by comprising:

a support unit;

the extrusion unit comprises an extrusion screw rod for conveying melt materials, the extrusion screw rod is arranged inside the extrusion unit, a pushing table for pushing the melt materials forwards is arranged inside the extrusion screw rod, the bottom surface of the pushing table is movably connected with a movable pipe through a middle rod, and a connecting plate is arranged on the side part of the middle rod and used for controlling the pushing table to move forwards, horizontally push and fold backwards;

2. The polyethylene foam extrusion molding apparatus according to claim 1,

the connecting plates are symmetrically distributed along the center line of the moving pipe, the bottom of the moving pipe which is symmetrically distributed is provided with an adjusting rod and a driven rod respectively, and the bottom of the pushing table is movably connected with the mounting groove of the moving pipe through a middle rod;

and the inner side of the top of the extrusion screw is provided with an ejection column, and the ejection column is connected with the extruder head through the extrusion screw.

3. The polyethylene foam extrusion molding apparatus according to claim 2,

the extrusion unit also comprises a gas input unit which is respectively communicated and connected with the extrusion unit and the control unit through gas input pipes;

4. The polyethylene foaming extrusion molding apparatus according to claim 3,

the control unit comprises an extrusion power unit, the extrusion power unit is arranged at the top of the support unit and is in transmission connection with the driving disc through an output shaft of the extrusion power unit, and the top of the driving disc is in transmission connection with the driven disc;

5. The polyethylene foam extrusion molding apparatus according to claim 4,

the inner connecting wheels are symmetrically arranged along the central line of the moving pipe, the inner connecting wheels are respectively in transmission connection with a primary cam cylinder and a secondary cam cylinder through penetrating columns, a primary spiral groove is formed in the surface of the primary cam cylinder in a surrounding mode, and a secondary spiral groove is formed in the surface of the secondary cam cylinder in a surrounding mode;

6. The polyethylene foam extrusion molding apparatus according to claim 5,

the sleeve plate is sleeved on the surface of the moving pipe, a ring plate is arranged at the bottom of the sleeve plate and sleeved on the surface of the moving pipe, and the ring plate is elastically connected with the middle linkage plate through elastic units arranged around the ring plate;

7. The polyethylene foam extrusion molding apparatus according to claim 6,

the inflation plug is movably connected with the inflator through a vent plate, the inflator is movably and hermetically connected with the movable pipe through a sealing cavity, and the gas input pipe is in conductive connection with the inner wall of the inflator;

8. The polyethylene foaming extrusion molding apparatus according to any one of claims 1 to 7,

the supporting unit comprises moving wheels, at least one group of moving wheels is arranged at the bottom of the supporting unit, a fixed seat is arranged on the inner side of each moving wheel, and a supporting frame is arranged at the top of the supporting unit;

9. The polyethylene foam extrusion molding apparatus according to claim 8,

the melting unit comprises a power unit, the power unit passes through a linkage unit and a transmission screw rod, and a melting barrel is arranged on the outer side of the transmission screw rod;

the material melting machine barrel is in conduction connection with the extrusion unit through a feed opening, the transmission screw is in conduction connection with a material control opening through a conveying material opening in the top of the transmission screw, a linkage box is arranged on the outer side of the linkage unit, and a cover plate is arranged on the outer side of an output shaft of the power unit.

10. A method for producing polyethylene foam molding by using the polyethylene foam extrusion molding device according to any one of claims 1 to 9, comprising:

step one, gravity feeding: the particle materials in the bin fall into the melting material machine barrel under the gravity traction;

step two, melting the material in a machine barrel: the heating unit controls the heating cover to heat, so that a melting barrel connected with the heating cover is heated, and particle materials in the melting barrel are heated to a melting state;