CN221161258U - Crosslinked micro-foaming plastic forming device - Google Patents

Abstract

The utility model belongs to the technical field of plastic molding, and provides a cross-linked micro-foaming plastic molding device which comprises a charging barrel, a material extruding screw, a mixing barrel and an air injection assembly. When the extrusion screw rod is close to the feeding pipe and moves, the feeding pipe and the discharging pipe are opened, the extrusion screw rod moves to drive the stop ring to move, and then melt at the rear end of the charging barrel can be extruded into the mixing cavity through the feeding pipe, when the melt enters the mixing cavity, the melt is sequentially communicated with one group of air inlets through the control air injection assembly, and other air inlets are sealed and shielded, so that critical fluid and melt can be injected into the mixing cavity at different positions along the axial direction of the mixing barrel, the efficiency of forming single-phase melt by fully dissolving high-molecular melt supercritical fluid and supercritical fluid formed by the follow-up raw materials at the front end of the charging barrel is improved, and the production efficiency of the device is further improved.

Description

Crosslinked micro-foaming plastic forming device

Technical Field

The utility model relates to the technical field of plastic molding, in particular to a crosslinked micro-foaming plastic molding device.

Background

The cross-linking micro-foaming technology in the EVA process shoe production process is that nitrogen or carbon dioxide is used for generating critical fluid through a fluid control system and is injected into a homogenizing area of a screw of an injection molding machine through a gas injection channel, and then the screw is used for plasticizing and shearing, so that a macromolecule melt supercritical fluid and a supercritical fluid formed by raw materials are fully dissolved in the homogenizing area to form a single-phase melt and kept under a certain constant pressure; and when an injection command of the injection molding machine is sent out, injecting the single-phase melt into a cavity of the mold to form the micro-foaming material.

At present, when critical fluid is injected into a screw homogenization area of an injection molding machine through an air injection channel, because the air injection channel is mainly fixedly arranged, the critical fluid enters the homogenization area from a fixed position, and then the high polymer melt supercritical fluid and the supercritical fluid formed by raw materials are fully dissolved in the homogenization area to form single-phase melt by plasticizing and shearing the screw, but the injection of the critical fluid at the fixed position reduces the efficiency of fully dissolving the high polymer melt supercritical fluid and the supercritical fluid formed by the subsequent raw materials in the homogenization area to form the single-phase melt, thereby reducing the production efficiency of the device. Therefore, in order to solve the above-mentioned technical problems, a crosslinked micro-foaming plastic molding device is proposed.

Disclosure of utility model

Aiming at the defects existing in the prior art, the utility model provides a cross-linked micro-foaming plastic forming device, which improves the efficiency of fully dissolving a macromolecule melt supercritical body and a supercritical fluid formed by raw materials in a homogenization area to form a single-phase melt body, thereby improving the production efficiency of the device.

The utility model provides a crosslinked micro-foaming plastic forming device, includes feed cylinder and crowded material screw rod, crowded material screw rod rotatable setting is in the feed cylinder, and can follow feed cylinder axial reciprocating motion still includes:

The two ends of the mixing drum are communicated with the charging drum through a feeding pipe and a discharging pipe with valves, a stop ring is arranged on the extruding screw, and the stop ring is arranged in the charging drum in a sealing sliding manner and is positioned between the feeding pipe and the discharging pipe; and

The gas injection assembly is arranged in the mixing drum, a mixing cavity communicated with the feeding pipe and the discharging pipe is formed in the mixing drum, a guide cavity is formed in the periphery of the mixing drum, a plurality of groups of gas inlets communicated with the mixing cavity are formed in the bottom surface of the guide cavity along the axial direction of the mixing drum at intervals, and the gas injection assembly is arranged in the guide cavity and can be communicated with one group of the gas inlets in sequence and seal and shield the other gas inlets.

The cross-linked micro-foaming plastic forming device has the beneficial effects that:

When the extrusion screw rod is close to the feeding pipe and moves, the feeding pipe and the discharging pipe are opened, the extrusion screw rod moves to drive the stop ring to move, and then melt at the rear end of the charging barrel can be extruded into the mixing cavity through the feeding pipe, when the melt enters the mixing cavity, the melt is sequentially communicated with one group of air inlets through the control air injection assembly, and other air inlets are sealed and shielded, so that critical fluid and melt can be injected into the mixing cavity at different positions along the axial direction of the mixing barrel, the efficiency of forming single-phase melt by fully dissolving high-molecular melt supercritical fluid and supercritical fluid formed by the follow-up raw materials at the front end of the charging barrel is improved, and the production efficiency of the device is further improved.

In one embodiment, the gas injection assembly includes a seal housing and a drive assembly; the sealing device is characterized in that an air inlet pipe with a valve is arranged on the sealing seat, sealing plates are arranged at two ends of the sealing seat, the sealing seat can be arranged in the guide cavity along the axial reciprocating movement of the mixing cylinder, the air inlet pipe can be communicated with one group of air inlets, the sealing plates can seal and shield the other air inlets, and the driving assembly is arranged on the mixing cylinder and used for driving the sealing seat to reciprocate. The sealing seat is driven to slide through the driving assembly, the sealing seat can drive the air inlet pipe to slide, the air inlet pipe can be communicated with one group of air inlets in sequence after sliding, the sealing seat drives the two groups of sealing plates to slide, the sealing plates can seal the rest of air inlets after sliding, and the critical fluid and the melt supercritical fluid are conveniently injected into the mixing cavity at different positions to be mixed.

In one embodiment, the drive assembly includes a drive screw and a first motor; the driving screw rod can be rotatably arranged in the guide cavity and is in threaded connection with the sealing seat, the first motor is arranged on the mixing drum, and the output end of the first motor is connected with the driving screw rod through a coupler. The driving screw is driven to rotate through the first motor, the sealing seat can be driven to move through the threaded cooperation of the driving screw and the sealing seat, the driving screw is driven to reversely rotate through the first motor, the sealing seat can be driven to reversely move through the threaded cooperation of the driving screw and the sealing seat, and the driving sealing seat is convenient to reciprocate.

In one embodiment, the sealing seat and the bottom ends of the two groups of sealing plates are provided with the same group of sealing rings, and the sealing rings can be in close contact with the bottom surface of the guide cavity. The sealing performance of the sealing seat and the two groups of sealing plates in contact with the bottom surface of the guide cavity is improved, and the phenomenon of air leakage is avoided.

In one embodiment, the stirring device further comprises a stirring mechanism, the stirring mechanism comprises a first rotating shaft and a second motor, the first rotating shaft and the mixing cavity are coaxially arranged, the first rotating shaft is rotatably arranged in the mixing cavity, one end of the first rotating shaft extends out of the mixing cylinder through a sealing element, a plurality of groups of first stirring rods are arranged at intervals at the end part of the first rotating shaft, which is positioned in the mixing cavity, the second motor is arranged on the mixing cylinder, and the output end of the second motor is connected with the end part of the first rotating shaft, which is positioned outside the mixing cylinder, through a coupling. The first rotating shaft is driven to rotate by the second motor, and the first rotating shaft can drive a plurality of groups of first stirring rods to stir the mixed melt and critical fluid, so that the mixing effect of the melt and the critical fluid is improved.

In one embodiment, the stirring mechanism further comprises a second rotating shaft and a linkage assembly; the second rotating shaft is provided with two groups, and with first rotating shaft parallel arrangement, two groups the rotatable setting of second rotating shaft is in the mixing chamber, and one end passes through the sealing member extends to outside the mixing drum, two groups the second rotating shaft is located the tip of mixing intracavity is all provided with multiunit second puddler at the interval, the interlock subassembly is connected respectively first rotating shaft and two groups the second rotating shaft, first rotating shaft rotates through the drive of interlock subassembly the reverse rotation of second rotating shaft. When the first rotating shaft rotates, the first rotating shaft drives the second rotating shaft to reversely rotate through the linkage assembly, and the first rotating shaft rotates and reversely rotates to mix the mixed melt and the critical fluid in a matched mode, so that the stirring effect can be improved.

In one embodiment, the linkage assembly includes a driving gear and a driven gear; the end part of the first rotating shaft extending to the outside of the mixing drum is provided with the driving gear, the end parts of the two groups of second rotating shafts extending to the outside of the mixing drum are provided with the driven gears, and the two groups of driven gears are meshed with the driving gear.

In one embodiment, the first stirring rods and the second stirring rods are axially staggered along the mixing cavity. The space between the stirring rods can be reduced, so that the stirring effect is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model, the drawings that are required to be used in the embodiments will be briefly described. Throughout the drawings, the elements or portions are not necessarily drawn to actual scale.

FIG. 1 is a schematic perspective view of a cross-linked micro-foam plastic molding apparatus according to an embodiment of the present utility model;

FIG. 2 is a front view of the cross-linked micro-foam plastic molding apparatus of FIG. 1 in cross-section;

FIG. 3 is an exploded view of the gas injection assembly of the crosslinked micro-foam plastic molding apparatus of FIG. 1;

FIG. 4 is an exploded view of the stirring mechanism in the crosslinked micro-foamed plastic molding apparatus shown in FIG. 1.

Reference numerals:

10. A charging barrel; 101. a material extruding screw; 1011. a stop ring;

20. A mixing drum; 201. a feed pipe; 202. a discharge pipe; 203. a mixing chamber; 204. a guide chamber; 205. an air inlet;

30. An air injection assembly; 301. a first motor; 302. driving a screw; 303. a sealing seat; 304. an air inlet pipe; 305. a sealing plate; 306. a seal ring;

40. A stirring mechanism; 401. a second motor; 402. a first rotating shaft; 4021. a first stirring rod; 403. a second rotating shaft; 4031. a second stirring rod; 404. a drive gear; 405. a driven gear.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.

Referring to fig. 1 to 3, a cross-linked micro-foaming plastic molding apparatus in an embodiment includes a barrel 10, an extrusion screw 101, a mixing barrel 20 and an air injection assembly 30.

Wherein the extrusion screw 101 is rotatably disposed in the barrel 10 and is capable of axially reciprocating along the barrel 10. The two ends of the mixing drum 20 are communicated with the charging drum 10 through a feeding pipe 201 and a discharging pipe 202 with valves, a stop ring 1011 is arranged on the extruding screw 101, and the stop ring 1011 is arranged in the charging drum 10 in a sealing sliding way and is positioned between the feeding pipe 201 and the discharging pipe 202. Mixing drum 20 is internally provided with a mixing cavity 203 communicated with a feeding pipe 201 and a discharging pipe 202, the periphery of the mixing drum 20 is provided with a guiding cavity 204, the bottom surface of the guiding cavity 204 is provided with a plurality of groups of air inlets 205 communicated with the mixing cavity 203 along the axial direction of the mixing drum 20 at intervals, and an air injection assembly 30 is arranged in the guiding cavity 204 and can be communicated with one group of air inlets 205 in sequence and seal and shield the rest of air inlets 205.

Specifically, the gas injection assembly 30 includes a seal housing 303 and a drive assembly; the sealing seat 303 is provided with an air inlet pipe 304 with a valve, both ends of the sealing seat 303 are provided with sealing plates 305, the sealing seat 303 can be arranged in the guide cavity 204 in a reciprocating manner along the axial direction of the mixing drum 20, the air inlet pipe 304 can be communicated with one group of air inlets 205, the sealing plates 305 can seal and shield the rest of the air inlets 205, and the driving assembly is arranged on the mixing drum 20 and is used for driving the sealing seat 303 to reciprocate. The drive assembly comprises a drive screw 302 and a first motor 301; the driving screw 302 is rotatably arranged in the guide cavity 204 and is in threaded connection with the sealing seat 303, the first motor 301 is arranged on the mixing drum 20, and the output end is connected with the driving screw 302 through a coupler.

In the above embodiment, when the extrusion screw 101 moves close to the feeding pipe 201, the feeding pipe 201 and the discharging pipe 202 are opened, the extrusion screw 101 moves to drive the stop ring 1011 to move so as to extrude the melt at the rear end of the barrel 10 into the mixing chamber 203 through the feeding pipe 201, when the melt enters the mixing chamber 203, the first motor 301 is started to perform forward and reverse rotation, the first motor 301 can drive the driving screw 302 to perform forward and reverse rotation, the driving screw 302 is in threaded engagement with the sealing seat 303 so as to drive the sealing seat 303 to axially reciprocate along the mixing barrel 20, the sealing seat 303 can drive the air inlet pipe 304 and the two groups of sealing plates 305 to reciprocate, the air inlet pipe 304 reciprocates so as to be sequentially communicated with one group of air inlets 205, and the two groups of sealing plates 305 reciprocate so as to seal and shelter the rest of air inlets 205, thereby facilitating the injection of critical fluid and melt into the mixing chamber 203 at different positions along the axial direction of the mixing barrel 20, and improving the efficiency of the high-molecular melt supercritical fluid and supercritical fluid formed by the subsequent raw materials to be fully dissolved at the front end of the barrel 10 so as to form a single-phase melt, and further improving the production efficiency of the device.

Further, the sealing seat 303 and the bottom ends of the two sets of sealing plates 305 are provided with the same set of sealing rings 306, and the sealing rings 306 can be closely contacted with the bottom surface of the guide cavity 204. The sealing performance of the sealing seat 303 and the sealing plate 305 in contact with the bottom surface of the guide cavity 204 is improved, and the phenomenon of air leakage is avoided.

Referring to fig. 2 to 4, in an embodiment, the stirring apparatus further includes a stirring mechanism 40, the stirring mechanism 40 includes a first shaft 402 and a second motor 401, the first shaft 402 is coaxially disposed with the mixing chamber 203, the first shaft 402 is rotatably disposed in the mixing chamber 203, one end of the first shaft 402 extends out of the mixing drum 20 through a sealing element, a plurality of groups of first stirring rods 4021 are disposed at intervals at an end of the first shaft 402 located in the mixing chamber 203, the second motor 401 is disposed on the mixing drum 20, and an output end of the second motor is connected to an end of the first shaft 402 located outside the mixing drum 20 through a coupling.

In the above embodiment, the second motor 401 drives the first shaft 402 to rotate, and the first shaft 402 rotates to drive the plurality of groups of first stirring rods 4021 to stir the mixed melt and the critical fluid, so as to improve the mixing effect of the melt and the critical fluid.

Further, based on the above embodiment, the stirring mechanism 40 further includes a second rotating shaft 403 and a linkage assembly; the second rotating shafts 403 are provided with two groups and are arranged in parallel with the first rotating shafts 402, the two groups of second rotating shafts 403 can be rotatably arranged in the mixing cavity 203, one end of each second rotating shaft extends out of the mixing drum 20 through a sealing element, a plurality of groups of second stirring rods 4031 are arranged at intervals at the end parts of the two groups of second rotating shafts 403, which are positioned in the mixing cavity 203, the linkage assembly is respectively connected with the first rotating shafts 402 and the two groups of second rotating shafts 403, and the first rotating shafts 402 rotate to drive the second rotating shafts 403 to reversely rotate through the linkage assembly. The seal in this embodiment is a CM11BD series mechanical seal.

Specifically, the linkage assembly includes a driving gear 404 and a driven gear 405; the end of the first rotating shaft 402 extending to the outside of the mixing drum 20 is provided with a driving gear 404, the end of the two sets of second rotating shafts 403 extending to the outside of the mixing drum 20 is provided with driven gears 405, and the two sets of driven gears 405 are meshed with the driving gear 404.

In the above embodiment, when the first rotating shaft 402 rotates, the first rotating shaft 402 drives the driving gear 404 to rotate and engage with the driven gear 405 to drive the driven gear 405 to rotate reversely, the driven gear 405 rotates reversely to drive the second rotating shaft 403 to rotate reversely, the second rotating shaft 403 rotates reversely to drive the plurality of groups of second stirring rods 4031 to rotate reversely, and the mixed melt and critical fluid are stirred by the rotation of the first rotating shaft 402 and the reverse rotation of the second rotating shaft 403, so as to improve the stirring effect.

Further to the above embodiment, the first stirring bar 4021 and the second stirring bar 4031 are staggered axially along the mixing chamber 203. The space between the stirring rods can be reduced, so that the stirring effect is improved.

The specific implementation mode of the cross-linked micro-foaming plastic forming device is as follows:

When the extrusion screw 101 moves close to the feeding pipe 201, the feeding pipe 201 and the discharging pipe 202 are opened, the extrusion screw 101 moves to drive the stop ring 1011 to move so as to extrude the melt at the rear end of the charging barrel 10 into the mixing cavity 203 through the feeding pipe 201, when the melt enters the mixing cavity 203, the first motor 301 is started to rotate forward and backward, the first motor 301 can drive the driving screw 302 to rotate forward and backward, the driving screw 302 rotates forward and backward and is matched with the sealing seat 303 in a threaded manner so as to drive the sealing seat 303 to reciprocate axially along the mixing barrel 20, the sealing seat 303 moves reciprocally so as to drive the air inlet pipe 304 and the two groups of sealing plates 305 to reciprocate, the air inlet pipe 304 is communicated with one group of air inlets 205 in sequence, and the two groups of sealing plates 305 reciprocate so as to seal and shield the other air inlets 205, so that critical fluid and melt can be injected into the mixing cavity 203 at different positions along the axial direction of the mixing barrel 20.

Meanwhile, the first rotating shaft 402 is driven to rotate through the second motor 401, the first rotating shaft 402 can drive a plurality of groups of first stirring rods 4021 to stir the mixed melt and critical fluid, the first rotating shaft 402 drives the driving gear 404 to rotate and is meshed with the driven gear 405, the driven gear 405 can be driven to reversely drive the second rotating shaft 403 to reversely rotate, the second rotating shaft 403 reversely rotates to drive a plurality of groups of second stirring rods 4031 to reversely rotate, and the mixed melt and the critical fluid are stirred through the reverse rotation of the first rotating shaft 402 and the reverse rotation of the second rotating shaft 403, so that the stirring effect is improved.

The mixed melt and critical fluid enter the front end of the charging barrel 10 through the discharging pipe 202, the feeding pipe 201 and the discharging pipe 202 are closed, then the extruding screw 101 moves close to the discharging pipe 202, the molten supercritical fluid and the supercritical fluid in the front end of the charging barrel 10 are fully dissolved to form a single-phase melt through plasticization shearing of the extruding screw 101, and the single-phase melt is formed by entering a cavity through an injection nozzle at the front end of the charging barrel 10, so that the efficiency of the high polymer molten supercritical fluid and the supercritical fluid formed by raw materials in a homogenization area is improved, and the production efficiency of the device is further improved.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description.

Claims (8)

1. The utility model provides a crosslinked micro-foaming plastic forming device, includes feed cylinder (10) and crowded material screw rod (101), crowded material screw rod (101) rotatable setting is in feed cylinder (10), and can follow feed cylinder (10) axial reciprocating motion, its characterized in that still includes:

The mixing drum (20) is communicated with the charging drum (10) through a charging pipe (201) and a discharging pipe (202) with valves at two ends, a stop ring (1011) is arranged on the extruding screw (101), and the stop ring (1011) is arranged in the charging drum (10) in a sealing sliding way and is positioned between the charging pipe (201) and the discharging pipe (202); and

The gas injection assembly (30), set up in the mixing drum (20) with feed pipe (201) with mixing chamber (203) of discharging pipe (202) intercommunication, guide cavity (204) have been seted up to mixing drum (20) week side, guide cavity (204) bottom surface is followed mixing drum (20) axial spaced set up multiunit with air inlet (205) of mixing chamber (203) intercommunication, gas injection assembly (30) set up in guide cavity (204), and can be in proper order with one of them a set of air inlet (205) intercommunication, and sealed shielding the rest air inlet (205).

2. The crosslinked micro-foam plastic molding apparatus according to claim 1, wherein the gas injection assembly (30) comprises a sealing seat (303) and a drive assembly; the sealing device is characterized in that an air inlet pipe (304) with a valve is arranged on the sealing seat (303), sealing plates (305) are arranged at two ends of the sealing seat (303), the sealing seat (303) can be arranged in the guide cavity (204) in an axially reciprocating manner along the mixing cylinder (20), the air inlet pipe (304) can be communicated with one group of air inlets (205), the sealing plates (305) can seal and shield the rest of the air inlets (205), and the driving assembly is arranged on the mixing cylinder (20) and used for driving the sealing seat (303) to reciprocate.

3. The crosslinked micro-foam plastic molding apparatus according to claim 2, wherein the drive assembly comprises a drive screw (302) and a first motor (301); the driving screw (302) is rotatably arranged in the guide cavity (204) and is in threaded connection with the sealing seat (303), the first motor (301) is arranged on the mixing drum (20), and the output end of the first motor is connected with the driving screw (302) through a coupler.

4. The cross-linked micro-foaming plastic molding device according to claim 2, wherein the sealing seat (303) and the bottom ends of the two groups of sealing plates (305) are provided with the same group of sealing rings (306), and the sealing rings (306) can be tightly contacted with the bottom surface of the guide cavity (204).

5. The cross-linked micro-foaming plastic molding device according to claim 1, further comprising a stirring mechanism (40), wherein the stirring mechanism (40) comprises a first rotating shaft (402) and a second motor (401), the first rotating shaft (402) and the mixing cavity (203) are coaxially arranged, the first rotating shaft (402) is rotatably arranged in the mixing cavity (203), one end of the first rotating shaft extends out of the mixing cylinder (20) through a sealing element, a plurality of groups of first stirring rods (4021) are arranged at intervals at the end part of the first rotating shaft (402) positioned in the mixing cavity (203), the second motor (401) is arranged on the mixing cylinder (20), and the output end of the second motor is connected with the end part of the first rotating shaft (402) positioned outside the mixing cylinder (20) through a coupling.

6. The cross-linked micro-foaming plastic molding apparatus according to claim 5, wherein the stirring mechanism (40) further comprises a second rotating shaft (403) and a linkage assembly; the second rotating shafts (403) are provided with two groups and are arranged in parallel with the first rotating shafts (402), the two groups of second rotating shafts (403) can be arranged in the mixing cavity (203) in a rotating mode, one end of each second rotating shaft extends to the outside of the mixing cylinder (20) through the sealing piece, the two groups of second rotating shafts (403) are located at the end portions of the mixing cavity (203) at intervals, a plurality of groups of second stirring rods (4031) are arranged at intervals, the linkage assembly is connected with the first rotating shafts (402) and the two groups of second rotating shafts (403) respectively, and the first rotating shafts (402) rotate to drive the second rotating shafts (403) to reversely rotate through the linkage assembly.

7. The crosslinked micro foamed plastic molding apparatus according to claim 6, wherein the interlocking assembly includes a driving gear (404) and a driven gear (405); the end part of the first rotating shaft (402) extending to the outside of the mixing drum (20) is provided with a driving gear (404), the end parts of the two groups of the second rotating shafts (403) extending to the outside of the mixing drum (20) are provided with driven gears (405), and the two groups of the driven gears (405) are meshed with the driving gear (404).

8. The crosslinked micro foamed plastic molding apparatus according to claim 6, wherein the first stirring rod (4021) and the second stirring rod (4031) are axially staggered along the mixing chamber (203).