CN114770899B - Preparation equipment and preparation method of extinction master batch for plastic - Google Patents
Preparation equipment and preparation method of extinction master batch for plastic Download PDFInfo
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- CN114770899B CN114770899B CN202210220149.5A CN202210220149A CN114770899B CN 114770899 B CN114770899 B CN 114770899B CN 202210220149 A CN202210220149 A CN 202210220149A CN 114770899 B CN114770899 B CN 114770899B
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- wall
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- 239000004033 plastic Substances 0.000 title claims abstract description 64
- 229920003023 plastic Polymers 0.000 title claims abstract description 64
- 239000004594 Masterbatch (MB) Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 44
- 230000008033 biological extinction Effects 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 300
- 238000001125 extrusion Methods 0.000 claims abstract description 86
- 238000003825 pressing Methods 0.000 claims abstract description 54
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims description 144
- 238000012546 transfer Methods 0.000 claims description 17
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 7
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 7
- 229920002530 polyetherether ketone Polymers 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000012768 molten material Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/763—Vent constructions, e.g. venting means avoiding melt escape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of environmental monitoring, in particular to a preparation device and a preparation method of extinction master batch for plastics, wherein the preparation device comprises an extruder, and an exhaust hole is arranged on a cylinder body of the extruder; further comprising an exhaust device comprising: the shell is in threaded connection with the exhaust hole; the rotary table is positioned in the shell, a plurality of liquid transferring grooves are uniformly formed in the outer wall of the rotary table, a pressing plate is arranged in the liquid transferring grooves in a sliding sealing mode, and an extrusion rod is fixedly arranged on the pressing plate; a liquid inlet tank which is arranged on the inner wall of the shell; the exhaust groove is formed in the inner wall of the shell, and an elastic baffle plate is fixedly arranged at the lower end of the exhaust groove; a liquid return tank which is arranged on the inner wall of the shell; the extrusion lug is fixedly arranged on the inner wall of the shell, is positioned above the upper surface of the turntable and is obliquely arranged on the inner wall of the shell; the invention has simple structure, and can prevent the exhaust hole from being influenced by the material overflow in the exhaust process, so that the performance of the plastic master batch is reduced.
Description
Technical Field
The invention belongs to the technical field of environmental monitoring, and particularly relates to preparation equipment and a preparation method of a extinction master batch for plastics.
Background
The plastic master batch is a granule material prepared by firstly mixing and mixing various required auxiliary agents, fillers and a small amount of carrier resin in the plastic processing and forming process for convenience in operation, and metering, mixing, melting, extruding, granulating and other processing processes through equipment such as an extruder and the like. The plastic master batch consists of carrier resin, various fillers and various assistants.
In the process of preparing the plastic master batch, a screw extruder is necessary preparation equipment in the process of preparing the master batch, and in the process of preparing the master batch by extruding the screw extruder, as moisture or volatile components are carried in the raw materials of the plastic master batch, gas is required to be discharged from a molten material in the process of extruding the screw extruder in the process of preparing the plastic master batch, if the gas cannot be discharged, defects such as pores, bubbles and surface darkness can occur on the surface or inside of a product, the performance of the plastic master batch can be seriously influenced, and in order to discharge the gas in the molten material, an exhaust hole is formed in the extruder, however, in the working process of the exhaust extruder, the exhaust hole always has an material overflowing phenomenon due to unreasonable design of the screw or the exhaust hole, and further the discharge of volatile matters is influenced, so that the quality of the product is influenced; even a large amount of material is discharged to block the exhaust port, so that the extruder is stopped, and the preparation efficiency of the plastic master batch is reduced.
Disclosure of Invention
In order to make up the deficiency of the prior art, solve the problem that the exhaust hole always has a material-overflowing phenomenon due to unreasonable design of a screw or the exhaust hole in the working process of the exhaust extruder, thereby affecting the discharge of volatile matters and affecting the product quality; even if a large amount of material is discharged to block the exhaust port to cause the shutdown of the extruder, the preparation efficiency of the plastic master batch is reduced.
The technical scheme adopted for solving the technical problems is as follows: the invention relates to extinction master batch preparation equipment for plastics, which comprises an extruder, wherein an exhaust hole is arranged on a cylinder of the extruder and communicated with the inside of the cylinder of the extruder, and the exhaust hole is used for exhausting gas; the plastic extinction master batch preparation equipment further comprises an exhaust device, wherein the exhaust device is installed on the exhaust hole through threads, and the exhaust device comprises:
the shell is in threaded connection with the exhaust hole;
the rotary table is positioned in the shell, a plurality of liquid transferring grooves are uniformly formed in the outer wall of the rotary table, the opening of the liquid transferring groove is in contact with the inner wall of the shell, a pressing plate is arranged in the liquid transferring groove in a sliding and sealing mode, a reset spring is fixedly arranged at the upper end of the pressing plate, the other end of the reset spring is fixedly connected to the upper end of the liquid transferring groove, an extrusion rod is fixedly arranged on the pressing plate, the upper end of the extrusion rod extends out of the upper surface of the liquid transferring groove, and the reset spring is sleeved on the extrusion rod;
the liquid inlet tanks are arranged on the inner wall of the shell, a plurality of liquid inlet tanks are shared and are uniformly distributed on the periphery of the inner wall of the shell, and the upper end of each liquid inlet tank is higher than the lower end of each liquid transferring tank;
the exhaust grooves are formed in the inner wall of the shell, the exhaust grooves are distributed uniformly in a plurality of circumferential mode on the inner wall of the shell, one liquid inlet groove is formed below any exhaust groove in the vertical direction, the exhaust grooves are not communicated with the liquid inlet groove, the upper end of the liquid transferring groove is higher than the lower end of the exhaust groove, and an elastic baffle is fixedly arranged at the lower end of the exhaust groove;
the liquid returning tanks are arranged on the inner wall of the shell, a plurality of liquid returning tanks are shared and are uniformly distributed on the periphery of the inner wall of the shell, the liquid returning tanks and the liquid inlet tanks are positioned at the same height and are not communicated with each other, the liquid returning tanks and the liquid inlet tanks are in one-to-one correspondence and are alternately distributed, and the width of one end of the liquid returning tank, which is close to the liquid returning tank, is larger than that of one end of the liquid returning tank, which is far away from the liquid transferring tank;
the extrusion lug, extrusion lug fixed mounting in on the shell inner wall, extrusion lug is located the top of commentaries on classics cistern upper surface, extrusion lug is located just above the liquid return groove and the one-to-one between the two, extrusion lug is in the slope installation on the inner wall of shell.
Preferably, a hemisphere is fixedly arranged at the lower end of the turntable;
preferably, a plurality of raised strips are uniformly arranged on the outer wall of the spherical surface of the hemispherical body, and the projection of the raised strips in the vertical direction is parallel to the central line of the hemispherical body in the vertical direction;
preferably, the upper end and the lower end of the liquid transferring groove are respectively provided with a mounting groove, and sealing rings are fixedly arranged in the mounting grooves;
preferably, the sealing ring is hollow, and gas is filled in the sealing ring;
preferably, the sealing ring is made of PEEK material;
preferably, the thickness of the pressing plate is the same as the interval between the inner top wall of the liquid inlet tank and the inner bottom wall of the liquid transferring tank, and the interval between the inner top wall of the liquid inlet tank and the inner bottom wall of the liquid transferring tank is larger than the interval between the inner bottom wall of the liquid transferring tank and the inner top wall of the liquid returning tank;
preferably, the inner bottom surface of the liquid transferring groove has a right angle towards the edge direction of the liquid returning groove;
preferably, a guide groove is formed in the lower end of the extrusion lug, a guide wheel is fixedly arranged at the upper end of the extrusion rod, and the guide groove is matched with the guide wheel;
the preparation method of the extinction master batch for the plastic is suitable for any extinction master batch preparation equipment for the plastic, and comprises the following steps of:
s1, putting raw materials into an extruder, heating the raw materials by the extruder to convert the raw materials into molten raw materials, pushing the raw materials into an exhaust section, starting a vacuum pump, and enabling a liquid inlet tank to start to extract the molten raw materials;
s2, extracting the molten raw material in the shell by the liquid inlet tank, enabling the molten raw material, moisture and volatile components in the molten raw material to enter the liquid inlet tank together, flowing to the exhaust tank through the liquid transfer tank, and then discharging the moisture and the volatile components through the exhaust tank, wherein the molten raw material pushes the elastic baffle to seal the liquid transfer tank;
s3, the liquid transferring groove continuously rotates to be in contact with the boundary of the liquid returning groove, meanwhile, the extrusion protruding blocks are in contact with the extrusion rods, the extrusion rods are extruded to drive the pressing plates to move downwards to press the molten raw materials in the liquid transferring groove into the liquid returning groove, the molten raw materials are discharged into the extruder through the liquid returning groove to continuously move forwards, then the molten raw materials are extruded through an extrusion opening of the extruder, so that the preparation of plastic master batches is completed, and then the prepared plastic master batches are collected and stored.
The beneficial effects of the invention are as follows:
1. according to the extinction master batch preparation equipment for plastics, the liquid inlet groove, the exhaust groove, the liquid return groove and the rotary table are arranged, the molten raw material entering the exhaust hole flows to the exhaust groove through the liquid inlet groove after being pumped by the liquid return groove, so that moisture and volatile components in the molten raw material are discharged through the exhaust groove, and the elastic baffle plate is deformed in the process that the molten raw material continuously moves to the exhaust groove, so that the liquid return groove is closed, the molten raw material flows into the exhaust groove together with gas in the process of gas discharge, the exhaust groove is blocked, the normal operation of the exhaust is influenced, the moisture and other volatile components are carried in the molten raw material, the preparation of plastic master batch is influenced, the prepared plastic master batch is enabled to generate bubbles and pores, and the performance of the plastic master batch is reduced.
2. According to the extinction master batch preparation equipment for plastics, the hemispheres and the convex strips are arranged, so that when the molten raw materials in the exhaust holes are extracted by the liquid inlet groove, the molten raw materials at the centers of the exhaust holes can flow along the outer walls of the hemispheres towards the liquid inlet groove, and the defects that the molten raw materials at the centers of the exhaust holes cannot be completely extracted by the liquid inlet groove and flow into the liquid inlet groove, so that the water and volatile components in the molten raw materials flowing in the exhaust holes are not completely discharged and flow into the extruder again are avoided, and then the plastic master batch prepared by the extruder has the defects of bubbles, pores and the like, so that the performance of the plastic master batch is reduced.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
in the figure: the device comprises a shell 1, a liquid inlet tank 11, a gas outlet tank 12, an elastic baffle 121, a liquid return tank 13, a pressing lug 14, a rotary table 2, a liquid transfer tank 21, a sealing ring 211, a pressing rod 22, a pressing plate 23, a return spring 24, a hemispherical body 3 and a convex strip 31.
Detailed Description
The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
The embodiment of the invention solves the problem that the discharge hole is always caused to be material-overflowing due to unreasonable design of a screw rod or the discharge hole in the working process of the existing discharge extruder by providing the plastic master batch preparation equipment, thereby affecting the discharge of volatile matters and affecting the product quality; even a large amount of material is discharged to block the exhaust port, so that the extruder is stopped, and the preparation efficiency of the plastic master batch is reduced.
The technical scheme in the embodiment of the invention aims to solve the technical problems, and the overall thought is as follows: the exhaust hole of the exhaust type extruder is connected with an exhaust device through threads, wherein the exhaust device is arranged through devices such as a liquid inlet groove, a liquid transferring groove, an exhaust groove, a liquid returning groove, a pressing plate and the like, so that molten materials in the exhaust type extruder are sucked into the liquid inlet groove through a vacuum pump and flow into the exhaust groove through the liquid transferring groove, then gas in the molten materials can be discharged through the exhaust groove firstly, then an elastic baffle seals the liquid transferring groove, the liquid transferring groove rotates to be contacted with the liquid returning groove, and then the molten materials in the liquid transferring groove are pressed back into the exhaust type extruder again by the pressing plate, so that the phenomenon that the existing exhaust type extruder is subjected to material overflowing in the exhaust process is avoided.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 3, the extinction master batch preparation equipment for plastics comprises an extruder, wherein an exhaust hole is arranged on a cylinder of the extruder and communicated with the inside of the cylinder of the extruder, and the exhaust hole is used for exhausting gas; the plastic extinction master batch preparation equipment further comprises an exhaust device, wherein the exhaust device is installed on the exhaust hole through threads, and the exhaust device comprises:
the shell 1 is in threaded connection with the exhaust hole;
the rotary table 2 is positioned in the shell 1, a plurality of liquid transferring grooves 21 are uniformly formed in the outer wall of the rotary table 2, the opening of the liquid transferring grooves 21 is in contact with the inner wall of the shell 1, a pressing plate 23 is arranged in the liquid transferring grooves 21 in a sliding and sealing manner, a return spring 24 is fixedly arranged at the upper end of the pressing plate 23, the other end of the return spring 24 is fixedly connected to the upper end of the liquid transferring groove 21, a pressing rod 22 is fixedly arranged on the pressing plate 23, the upper end of the pressing rod 22 extends out to the upper surface of the liquid transferring groove 21, and the return spring 24 is sleeved on the pressing rod 22;
the liquid inlet tanks 11 are arranged on the inner wall of the shell 1, a plurality of liquid inlet tanks 11 are shared, the upper ends of the liquid inlet tanks 11 are uniformly distributed on the periphery of the inner wall of the shell 1, and the upper ends of the liquid inlet tanks 11 are higher than the lower ends of the liquid transferring tanks 21;
the exhaust grooves 12 are formed in the inner wall of the shell 1, the exhaust grooves 12 are shared and are uniformly distributed on the periphery of the inner wall of the shell 1, one liquid inlet groove 11 is formed below any exhaust groove 12 in the vertical direction, the exhaust grooves 12 are not communicated with the liquid inlet groove 11, the upper end of the liquid conversion groove 21 is higher than the lower end of the exhaust groove 12, and an elastic baffle 121 is fixedly arranged at the lower end of the exhaust groove 12;
the liquid return tanks 13 are arranged on the inner wall of the shell 1, the liquid return tanks 13 are shared and are uniformly distributed on the periphery of the inner wall of the shell 1, the liquid return tanks 13 and the liquid inlet tanks 11 are positioned at the same height and are not communicated with each other, the liquid return tanks 13 and the liquid inlet tanks 11 are in one-to-one correspondence and are alternately distributed, and the width of one end of the liquid return tank 13 close to the liquid transfer tank 21 is larger than that of one end of the liquid return tank 13 far away from the liquid transfer tank 21;
the extrusion convex blocks 14 are fixedly arranged on the inner wall of the shell 1, the extrusion convex blocks 14 are positioned above the upper surface of the liquid transferring groove 21, the extrusion convex blocks 14 are positioned right above the liquid returning groove 13 and correspond to each other one by one, and the extrusion convex blocks 14 are obliquely arranged on the inner wall of the shell 1;
when the plastic master batch raw material enters the screw extruder through the feed inlet to be extruded and is prepared into plastic master batch, the raw material is heated in the screw extruder and becomes molten raw material, the molten raw material continuously moves towards the tail end of the extruder under the drive of the screw, when the molten raw material moves to the exhaust section, moisture and other volatile components carried in the molten raw material can be discharged through the exhaust holes, so that the prepared plastic master batch can reach the required standard, the moisture and other volatile components carried in the molten raw material can enter the exhaust holes together when being discharged through the exhaust holes, the material overflowing phenomenon occurs, the exhaust of the extruder is influenced, even the exhaust holes are blocked, the phenomenon of shutdown of the extruder occurs, when the molten raw material enters the shell 1, an external vacuum pump communicated with a cavity above the turntable 2 is started to work, so that the cavity above the turntable 2 and the interior of the exhaust groove 12 are pumped, the interior of the exhaust groove 12 is in a negative pressure state, meanwhile, the turntable 2 is driven by an external motor to rotate, a liquid transferring groove 21 formed on the turntable 2 is simultaneously communicated with the exhaust groove 12 and the liquid inlet groove 11, at the moment, the interior of the liquid transferring groove 21 and the liquid inlet groove 11 is also pumped by the vacuum pump because the exhaust groove 12 is communicated with the liquid transferring groove 21 and the liquid inlet groove 11, the interior of the liquid transferring groove 21 and the liquid inlet groove 11 are also in a negative pressure state, so that molten raw materials entering the interior of the shell 1 are pumped, when the liquid transferring groove 21 rotates to a position where the liquid inlet groove 11 and the exhaust groove 12 are simultaneously communicated, the molten raw materials entering the interior of the shell 1 flow into the liquid inlet groove 11 at first, and continuously flows into the liquid transferring groove 21, when the molten raw material flows into the liquid transferring groove 21, the water and volatile components carried in the molten raw material are heated and vaporized and then move upwards, so that the water and other volatile components carried in the molten raw material flow into the air exhausting groove 12 through the liquid transferring groove 21 before the molten raw material is heated and then are pumped by the vacuum pump, when the water and the volatile components are pumped, the molten raw material continuously flows into the air exhausting groove 12 after being pumped by the vacuum pump, at the moment, because the elastic baffle plate 121 is fixedly arranged at the lower end of the air exhausting groove 12, the molten raw material contacts with the elastic baffle plate 121 in the process of flowing into the air exhausting groove 12 and pushes the elastic baffle plate 121 to bend and deform towards the inner direction of the air exhausting groove 12, the elastic baffle 121 is made to contact with the edge of the top surface of the liquid transferring tank 21 facing the direction of the liquid transferring tank 12, and the gap between the liquid transferring tank 21 and the liquid transferring tank 12 is closed, so that the molten raw material in the liquid transferring tank 21 is blocked after the water and volatile components are discharged, the molten raw material is prevented from flowing into the liquid transferring tank 12 together with the gas in the process of gas discharge, the blocking of the liquid transferring tank 12 is avoided, the normal operation of the gas discharge is further influenced, the molten raw material carries water and other volatile components, the preparation of plastic master batch is influenced, the prepared plastic master batch has bubbles and pores, the performance of the plastic master batch is reduced, simultaneously, the rotary table 2 rotates under the action of an external motor, so that the liquid transferring tank 21 is driven to rotate, when the molten raw material flowing into the liquid transferring tank 21 through the liquid inlet tank 11 fills the liquid transferring tank 21, the liquid rotating groove 21 is just driven by the rotary table 2 to be staggered with the liquid inlet groove 11 and the liquid outlet groove 12, so that the liquid rotating groove 21 filled with molten raw materials is not communicated with the liquid inlet groove 11 and the liquid outlet groove 12, the rotary table 2 rotates towards the liquid return groove 13, when the liquid rotating groove 21 rotates to the boundary of the liquid return groove 13, the extrusion rod 22 at the upper end of the liquid rotating groove 21 is contacted with the extrusion lug 14 and is extruded downwards by the extrusion lug 14 when the liquid rotating groove 21 rotates to the boundary of the liquid return groove 13, the extrusion rod 22 continuously receives extrusion of the extrusion lug 14 from the beginning to the position between the liquid rotating groove 21 and the liquid return groove 13 in a communicating process, the pressing rod 22 drives the pressing plate 23 to move towards the lower end of the liquid rotating groove 21 together, so that the molten raw materials in the liquid rotating groove 21 are pressed into the liquid return groove 13 by the pressing plate 23 and are input into the extruder again through the liquid return groove 13, and when the liquid rotating groove 21 rotates to the rotary table 2 and is not communicated with the liquid return groove 13, at the moment, a reset spring 24 is fixedly connected to the pressing plate 23, and the extrusion rod 22 is not influenced by the extrusion lug 14, so that the extrusion lug 14 does not move downwards, the extrusion lug 14 moves downwards, the extrusion lug 24 is prevented from the extrusion lug 14, and the extrusion hole is influenced by the extrusion hole is prevented, and the extrusion hole is influenced, and the extrusion hole is prevented from being produced, and the extrusion hole is produced.
As an embodiment of the present invention, as shown in fig. 1, a hemisphere 3 is fixedly mounted at the lower end of the turntable 2;
when the molten raw material flows into the shell 1, the external vacuum pump is started to pump air from the cavity above the turntable 2 and the inside of the air outlet groove 12, meanwhile, the liquid transfer groove 21 moves to the position communicated with the air outlet groove 12 and the liquid inlet groove 11 at the same time under the rotation of the turntable 2, the air outlet groove 12, the liquid transfer groove 21 communicated with the air outlet groove 12 and the liquid inlet groove 11 are in a negative pressure state, so that the molten raw material in the shell 1 is pumped into the liquid inlet groove 11, at the moment, the hemispheroids 3 are fixedly arranged at the lower end of the turntable 2, and the gas generated in the molten raw material continuously moves to the edge of the shell 1 along the outer wall of the hemispheroids 3 under the pumping of the liquid inlet groove 11, so that the liquid inlet groove 11 is pumped, the phenomenon that the gas generated in the molten raw material is accumulated in the shell 1 and cannot be pumped into the liquid inlet groove 11 is avoided, the liquid in the shell 1 is discharged through the air outlet groove 12, the water and volatile components in the molten raw material flowing in the shell 1 are not completely discharged, and the plastic master batch prepared by the extruder is further caused, and the plastic master batch prepared by the extruder is degraded in performance.
As an embodiment of the present invention, as shown in fig. 1, a plurality of protruding strips 31 are uniformly arranged on the spherical outer wall of the hemispherical body 3, and the projection of the protruding strips 31 in the vertical direction is parallel to the central line of the hemispherical body 3 in the vertical direction;
when the extruder is in operation, when the molten raw material flows into the extruder through the liquid return tank 13 after the exhaust is completed, at this time, as the outer wall of the hemispheroid 3 is uniformly provided with the convex strips 31, in the rotating process of the rotary table 2, the hemispheroid 3 synchronously rotates, so that the convex strips 31 are driven to synchronously rotate, and the molten raw material discharged into the extruder again through the liquid return tank 13 is stirred to a certain extent, so that the problem that the performance of the prepared plastic master batch is influenced and performance is reduced due to the fact that the molten raw material in the liquid return tank 13 is always positioned below the liquid return tank 13 when the molten raw material is discharged into the extruder again, the pushing speed of the extruder screw to the molten raw material discharged from the liquid return tank 13 is smaller than the discharging speed of the liquid return tank 13, the molten raw material discharged from the liquid return tank 13 is extracted again and flows into the liquid inlet tank 11, and the molten raw material in the shell 1 cannot be sufficiently exhausted, and the exhaust in the molten raw material is not thoroughly caused.
As an embodiment of the present invention, as shown in fig. 2, the upper and lower ends of the liquid transferring tank 21 are provided with mounting grooves, and sealing rings 211 are fixedly installed in the mounting grooves;
during operation, as the sealing rings 211 are arranged at the upper end and the lower end of the liquid rotating groove 21, in the process of extracting the molten raw materials in the shell 1 by the liquid inlet groove 11, the molten raw materials are blocked by the sealing rings 211 due to the arrangement of the sealing rings 211, so that the molten raw materials are prevented from leaking between the liquid inlet groove 11 and the inner wall of the shell 1 in the process of extracting by the liquid inlet groove 11, and enter the cavity above the rotary table 2, thereby blocking the exhaust holes, affecting the exhaust of the exhaust holes, and further preventing moisture and volatile components in the molten raw materials from being thoroughly discharged, so that the quality and performance of the prepared plastic master batch finished product are reduced.
As an embodiment of the present invention, as shown in fig. 2, the inside of the sealing ring 211 is hollow, and the sealing ring 211 is filled with gas;
when the rotary table 2 rotates under the drive of an external motor, the sealing ring 211 positioned on the rotary table 21 rotates synchronously and is continuously contacted with the inner wall of the shell 1, the sealing ring 211 is extruded by the inner wall of the shell 1, meanwhile, as the sealing ring 211 is hollow and the sealing ring 211 is filled with gas, when the sealing ring 211 is extruded by the inner wall of the shell 1, the gas positioned in the sealing ring 211 flows in the sealing ring 211 under the extrusion action of the inner wall of the shell 1 to the sealing ring 211, when the sealing ring 211 rotates to the positions of the exhaust groove 12 and the liquid inlet groove 11, the sealing ring 211 is not extruded by the inner wall of the shell 1, so that the gas can stay in the sealing ring 211 in the exhaust groove 12 and the liquid inlet groove 11, and the volume of the sealing ring 211 is larger than that of the sealing ring 211 outside the groove, so that the sealing effect of the sealing ring 211 on molten raw materials is better, and the phenomenon that the molten raw materials leak is further avoided.
As an embodiment of the present invention, the sealing ring 211 is made of PEEK material;
during operation, because sealing ring 211 is made of PEEK material, consequently when sealing ring 211 constantly takes place to rotate with shell 1 inner wall under the drive of carousel 2 to owing to PEEK material's good wear resistance, the wearing and tearing that have guaranteed that sealing ring 211 produced when constantly rotating with shell 1 inner wall is less, thereby make sealing ring 211's life longer.
As an embodiment of the present invention, as shown in fig. 1 and 3, the thickness of the pressing plate 23 is the same as the interval between the inner top wall of the liquid inlet tank 11 and the inner bottom wall of the liquid transferring tank 21, and the interval between the inner top wall of the liquid inlet tank 11 and the inner bottom wall of the liquid transferring tank 21 is larger than the interval between the inner bottom wall of the liquid transferring tank 21 and the inner top wall of the liquid returning tank 13;
when the extrusion rod 22 is extruded to move downwards to discharge the molten raw material in the liquid transferring groove 21, the thickness of the pressing plate 23 is larger than the distance between the liquid transferring groove 21 and the liquid returning groove 13, so that the molten raw material in the liquid transferring groove 21 is completely extruded by the pressing plate 23 when the pressing plate 23 is extruded downwards to discharge the molten raw material, the molten raw material in the liquid transferring groove 21 is ensured to be completely extruded by the pressing plate 23, the phenomenon that a certain amount of molten raw material cannot be extruded in the liquid transferring groove 21, the amount of the molten raw material discharged into the extruder by the liquid returning groove 13 is smaller than the amount of the molten raw material discharged out of the extruder, waste and loss of the molten raw material are caused, the preparation cost for preparing plastic master batches with the same yield is increased, and the problem that the molten raw material in the liquid transferring groove 21 cannot be completely extruded by the pressing plate 23, the internal volume of the liquid transferring groove 21 is gradually reduced, and blockage is further caused, and the normal operation of an exhaust device is influenced is avoided.
As an embodiment of the present invention, as shown in fig. 1, the inner bottom surface of the liquid transferring tank 21 has a right angle toward the edge of the liquid returning tank 13;
when the plastic mother grain extrusion device works, as the lower end of the liquid transfer groove 21 is guided towards the liquid return groove 13 by a right angle, when the molten raw material in the liquid transfer groove 21 flows towards the liquid return groove 13 under the extrusion action of the pressing plate 23, the molten raw material in the liquid transfer groove 21 flows towards the liquid return groove 13 along the right angle towards the liquid return groove 13, so that the molten raw material in the liquid transfer groove 21 can more easily flow into the liquid return groove 13, the molten raw material amount discharged into the extruder by the liquid return groove 13 is prevented from being smaller than the molten raw material amount discharged from the extruder, waste and loss of the molten raw material are avoided, the preparation cost for preparing plastic mother grain with the same yield is increased, the molten raw material in the liquid transfer groove 21 cannot be completely extruded by the pressing plate 23, the internal volume of the liquid transfer groove 21 is gradually reduced, and blockage is avoided, and the normal operation of the exhaust device is influenced.
As an embodiment of the present invention, as shown in fig. 1 and 3, a guide groove is formed at the lower end of the extrusion bump 14, a guide wheel is fixed at the upper end of the extrusion rod 22, and the guide groove and the guide wheel are matched with each other;
when the rotary table 2 drives the rotary table 21 to move towards the boundary of the liquid return groove 13, the extrusion lug 14 simultaneously starts to extrude the extrusion rod 22, and at the moment, as the guide groove is formed in the extrusion lug 14, the guide wheel is fixedly arranged at the upper end of the extrusion rod 22, so that when the extrusion lug 14 extrudes the extrusion rod 22, the guide wheel can enter the guide groove and is always positioned in the guide groove along with the extrusion lug 14, the extrusion lug 14 is prevented from deflecting in the extrusion rod 22 in the extrusion process of the extrusion rod 22, the extrusion lug 14 cannot extrude the extrusion rod 22, the pressing plate 23 cannot press the molten raw material in the rotary table 21, the operation of equipment is affected, and meanwhile, as the guide wheel is fixedly arranged at the upper end of the extrusion rod 22, the abrasion of the extrusion rod 22 is reduced when the extrusion lug 14 extrudes the extrusion rod 22 downwards, so that the extrusion lug 14 cannot extrude the extrusion rod 22 well, and the pressing plate 23 cannot press the molten raw material in the rotary table 21 into the extruder.
The preparation method of the extinction master batch for the plastic is suitable for any one of the preparation equipment of the extinction master batch for the plastic, and comprises the following steps:
s1, putting raw materials into an extruder, heating the raw materials by the extruder to convert the raw materials into molten raw materials, pushing the raw materials into an exhaust section, starting a vacuum pump, and enabling a liquid inlet tank 11 to start to extract the molten raw materials;
s2, the liquid inlet groove 11 extracts the molten raw material in the shell 1, so that the molten raw material and moisture and volatile components in the molten raw material enter the liquid inlet groove 11 together and flow to the exhaust groove 12 through the liquid transfer groove 21, and then the moisture and the volatile components are discharged through the exhaust groove 12, and the molten raw material pushes the elastic baffle 121 to seal the liquid transfer groove 21;
s3, the liquid transferring groove 21 continuously rotates to be in boundary contact with the liquid returning groove 13, meanwhile, the extrusion protruding block 14 is in contact with the extrusion rod 22, the extrusion rod 22 is extruded to drive the pressing plate 23 to move downwards to press the molten raw material in the liquid transferring groove 21 into the liquid returning groove 13, the molten raw material is discharged into the extruder through the liquid returning groove 13 to continuously move forwards, and then the molten raw material is extruded through an extrusion opening of the extruder, so that the preparation of plastic master batches is completed, and then the prepared plastic master batches are collected and stored.
The specific working procedure is as follows:
when the plastic master batch raw material enters the screw extruder through the feed inlet to be extruded and is prepared into plastic master batch, the raw material is heated in the screw extruder and becomes molten raw material, the molten raw material continuously moves towards the tail end of the extruder under the drive of the screw, when the molten raw material moves to the exhaust section, moisture and other volatile components carried in the molten raw material can be discharged through the exhaust hole, the molten raw material can enter the exhaust hole together, the material overflow phenomenon occurs, the exhaust of the extruder is influenced, even the exhaust hole is blocked, the shutdown phenomenon of the extruder occurs, when the molten raw material enters the exhaust hole, at the moment, an external vacuum pump communicated with the exhaust groove 12 is started, the external vacuum pump starts to work, thereby exhausting the exhaust groove 12, a liquid rotating groove 21 communicated with the exhaust groove 12 and the inside of the liquid inlet groove 11, the exhaust groove 12, the liquid transferring groove 21 communicated with the exhaust groove 12 and the liquid inlet groove 11 are in a negative pressure state, so that the molten raw material entering the exhaust hole is extracted, when the molten raw material entering the exhaust hole is extracted, the molten raw material firstly flows into the liquid inlet groove 11 and continuously flows into the liquid transferring groove 21, when the molten raw material flows into the liquid transferring groove 21, as the moisture and volatile components carried in the molten raw material are heated and gasified and then move upwards, in the liquid transferring groove 21, the moisture and other volatile components carried in the molten raw material firstly flow into the exhaust groove 12 through the liquid transferring groove 21 after being heated and are extracted by a vacuum pump communicated with the exhaust groove 12, when the moisture and the volatile components are extracted, the molten raw material continuously flows into the exhaust groove 12 after being extracted, at this time, since the elastic baffle plate 121 is fixedly arranged at the lower end of the exhaust groove 12, the molten raw material is contacted with the elastic baffle plate 121 in the process of flowing into the exhaust groove 12, and pushes the elastic baffle plate 121 to bend and deform, so that one end of the elastic baffle plate 121 far away from the lower end of the exhaust groove 12 is contacted with the upper end of the liquid transferring groove 21, thereby the moisture and volatile components in the molten raw material in the liquid transferring groove 21 are completely discharged and then blocked, simultaneously, the rotary table 2 rotates under the action of an external motor, thereby driving the liquid transferring groove 21 to rotate, when the molten raw material fills the liquid transferring groove 21, the liquid transferring groove 21 is just separated from the liquid inlet groove 11 and the exhaust groove 12 under the driving of the rotary table 2, so that the liquid transferring groove 21 filled with the molten raw material is not communicated with the liquid inlet groove 11 and the exhaust groove 12, and rotates towards the liquid returning groove 13, when the liquid rotating tank 21 rotates to the boundary of the liquid returning tank 13, the extrusion rod 22 at the upper end of the liquid rotating tank 21 is contacted with the extrusion lug 14 and extruded by the extrusion lug 14, so that in the process of rotating contact between the liquid rotating tank 21 and the liquid returning tank 13, the extrusion rod 22 is extruded by the extrusion lug 14, so as to drive the pressing plate 23 to move towards the lower end of the liquid rotating tank 21 together, so that the molten raw material in the liquid rotating tank 21 is pressed into the liquid returning tank 13 by the pressing plate 23 and is input into the extruder again through the liquid returning tank 13, when the molten raw material flows into the exhaust hole, the vacuum pump is started to suck the exhaust groove 12, the liquid rotating tank 21 communicated with the exhaust groove 12 and the liquid inlet tank 11 are all in a negative pressure state, so that the molten raw material in the exhaust hole is sucked into the liquid inlet tank 11, and at the moment, due to the fact that the lower end of the rotating plate 2 is fixedly provided with the hemispheres 3, in the process of extracting molten raw materials in the exhaust hole by the liquid inlet groove 11, the liquid inlet groove 11 extracts the molten raw materials above the hemispheroids 3 firstly, so that the molten raw materials positioned in the center of the exhaust hole can be continuously extracted by the liquid inlet groove 11 along the hemispheroids 3, when the molten raw materials flow into the extruder through the liquid return groove 13 after the exhaust is completed, at the moment, as the outer wall of the hemispheroids 3 is uniformly provided with a plurality of raised strips 31, the hemispheroids 3 synchronously rotate in the rotating process of the turntable 2, so that the raised strips 31 are driven to synchronously rotate, the molten raw materials discharged into the extruder again by the liquid return groove 13 are stirred to a certain degree, and as the sealing rings 211 are arranged at the upper end and the lower end of the liquid return groove 21, the molten raw materials are blocked by the sealing rings 211 in the process of extracting the molten raw materials in the exhaust hole by the liquid inlet groove 11, when the rotary table 2 rotates under the drive of an external motor, the sealing ring 211 positioned on the rotary table 21 rotates at the same time and continuously contacts with the inner wall of the exhaust hole, the sealing ring 211 is extruded by the inner wall of the exhaust hole, meanwhile, because the sealing ring 211 is hollow and the sealing ring 211 is filled with gas, when the sealing ring 211 is extruded by the inner wall of the exhaust hole, the gas positioned in the sealing ring 211 flows in the sealing ring 211 under the extrusion action of the inner wall of the exhaust hole to the sealing ring 211, when the gas flows to the positions of the exhaust groove 12 and the liquid inlet groove 11, the sealing ring 211 is not extruded by the inner wall of the exhaust hole, and therefore, the gas stays in the sealing ring 211 in the exhaust groove 12 and the liquid inlet groove 11, because the sealing ring 211 is made of PEEK material, when the sealing ring 211 is continuously contacted with the inner wall of the exhaust hole under the drive of the rotary table 2, because of good wear resistance of PEEK material, when the pressing plate 23 is pressed down to discharge the molten raw material in the liquid return tank 21 by the pressing rod 22, the thickness of the pressing plate 23 is larger than the distance between the liquid return tank 21 and the liquid return tank 13, so that the molten raw material in the liquid return tank 21 can be completely pressed by the pressing plate 23 when the pressing plate 23 presses down to discharge the molten raw material, the molten raw material in the liquid return tank 21 can be completely pressed by the pressing plate 23, the right angle is guided towards the liquid return tank 13 by the lower end of the liquid return tank 21, when the molten raw material in the liquid return tank 21 flows into the liquid return tank 13 under the pressing action of the pressing plate 23, the molten raw material in the liquid return tank 21 flows into the liquid return tank 13 along the right angle towards the liquid return tank 13, so that the molten raw material in the liquid return tank 21 can flow into the liquid return tank 13 more easily, when the liquid return tank 21 is driven by the rotary table 2 to move towards the boundary of the liquid return tank 13, the pressing lug 14 starts to press the pressing the liquid return tank 22 at the same time, and the guide wheel is fixedly arranged on the upper end of the pressing rod 22 due to the guide groove on the pressing lug 14, and the guide wheel is always positioned in the guide groove along with the guide wheel when the pressing lug 22 presses the pressing lug 14.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The extinction master batch preparation equipment for the plastics comprises an extruder, wherein an exhaust hole is arranged on a cylinder body of the extruder and communicated with the inside of the cylinder body of the extruder, and the exhaust hole is used for exhausting gas;
the method is characterized in that: the plastic extinction master batch preparation equipment further comprises an exhaust device, wherein the exhaust device is installed on the exhaust hole through threads, and the exhaust device comprises:
the shell (1) is in threaded connection with the exhaust hole;
the rotary table (2), the rotary table (2) is located in the shell (1), a plurality of liquid transferring grooves (21) are uniformly formed in the outer wall of the rotary table (2), the opening of each liquid transferring groove (21) is in contact with the inner wall of the shell (1), a pressing plate (23) is mounted in a sliding sealing manner in each liquid transferring groove (21), a reset spring (24) is fixedly arranged at the upper end of each pressing plate (23), the other end of each reset spring (24) is fixedly connected to the upper end of each liquid transferring groove (21), an extrusion rod (22) is fixedly arranged on each pressing plate (23), the upper end of each extrusion rod (22) extends out to the position above the upper surface of each liquid transferring groove (21), and each reset spring (24) is sleeved on each extrusion rod (22);
the liquid inlet tanks (11) are arranged on the inner wall of the shell (1), the liquid inlet tanks (11) are shared in a plurality of parts and are uniformly distributed on the inner wall of the shell (1) in a circumferential manner, and the upper ends of the liquid inlet tanks (11) are higher than the lower ends of the liquid transferring tanks (21);
the exhaust grooves (12) are formed in the inner wall of the shell (1), the exhaust grooves (12) are shared and are uniformly distributed on the periphery of the inner wall of the shell (1), one liquid inlet groove (11) is formed below any exhaust groove (12) in the vertical direction, the exhaust grooves (12) are not communicated with the liquid inlet groove (11), the upper end of the liquid transferring groove (21) is higher than the lower end of the exhaust groove (12), and an elastic baffle (121) is fixedly arranged at the lower end of the exhaust groove (12);
the liquid return tanks (13) are arranged on the inner wall of the shell (1), the liquid return tanks (13) are shared in a plurality of and are uniformly distributed on the periphery of the inner wall of the shell (1), the liquid return tanks (13) and the liquid inlet tanks (11) are located at the same height and are not communicated with each other, the liquid return tanks (13) and the liquid inlet tanks (11) are in one-to-one correspondence and are alternately distributed, and the groove width of one end, close to the liquid transfer tank (21), of the liquid return tank (13) is larger than the groove width of one end, far away from the liquid transfer tank (21), of the liquid return tank (13);
extrusion lug (14), extrusion lug (14) fixed mounting in on shell (1) inner wall, extrusion lug (14) are located the top of changeing liquid groove (21) upper surface, extrusion lug (14) are located return liquid groove (13) directly over and between the two one-to-one, extrusion lug (14) are in slope installation on the inner wall of shell (1).
2. The matting masterbatch preparation device for plastics according to claim 1, characterized in that: the lower end of the rotary table (2) is fixedly provided with a hemispheroid (3).
3. The matting masterbatch preparation device for plastics according to claim 2, characterized in that: a plurality of raised strips (31) are uniformly arranged on the outer wall of the spherical surface of the hemispherical body (3), and the projection of the raised strips (31) in the vertical direction is parallel to the central line of the hemispherical body (3) in the vertical direction.
4. The matting masterbatch preparation device for plastics according to claim 1, characterized in that: the upper end and the lower end of the liquid transferring groove (21) are respectively provided with a mounting groove, and sealing rings (211) are fixedly arranged in the mounting grooves.
5. The matting masterbatch preparation device for plastics according to claim 4, characterized in that: the inside of the sealing ring (211) is hollow, and gas is filled in the sealing ring (211).
6. The matting masterbatch preparation device for plastics according to claim 4, characterized in that: the sealing ring (211) is made of PEEK material.
7. The matting masterbatch preparation device for plastics according to claim 1, characterized in that: the thickness of the pressing plate (23) is the same as the interval between the inner top wall of the liquid inlet groove (11) and the inner bottom wall of the liquid transferring groove (21), and the interval between the inner top wall of the liquid inlet groove (11) and the inner bottom wall of the liquid transferring groove (21) is larger than the interval between the inner bottom wall of the liquid transferring groove (21) and the inner top wall of the liquid returning groove (13).
8. The matting masterbatch preparation device for plastics according to claim 1, characterized in that: the inner bottom surface of the liquid turning groove (21) is provided with a right angle towards the edge direction of the liquid returning groove (13).
9. The matting masterbatch preparation device for plastics according to claim 1, characterized in that: the lower end of the extrusion lug (14) is provided with a guide groove, the upper end of the extrusion rod (22) is fixedly provided with a guide wheel, and the guide groove is matched with the guide wheel.
10. A preparation method of extinction master batch for plastics is characterized by comprising the following steps: the preparation method is suitable for the extinction master batch preparation equipment for plastics, which is disclosed in any one of claims 1 to 9, and comprises the following steps:
s1, putting raw materials into an extruder, heating the raw materials by the extruder to convert the raw materials into molten raw materials, pushing the raw materials into an exhaust section, starting a vacuum pump, and enabling a liquid inlet tank (11) to start to extract the molten raw materials;
s2, a liquid inlet groove (11) is used for extracting molten raw materials in the shell (1), so that the molten raw materials, moisture and volatile components in the molten raw materials enter the liquid inlet groove (11) together and flow to an exhaust groove (12) through a liquid rotating groove (21), then the moisture and the volatile components are discharged through the exhaust groove (12), and the molten raw materials push an elastic baffle (121) to seal the liquid rotating groove (21);
s3, continuously rotating the liquid transferring groove (21) to be in boundary contact with the liquid returning groove (13), simultaneously, contacting the extrusion convex blocks (14) with the extrusion rods (22), extruding the extrusion rods (22) to drive the pressing plates (23) to move downwards to press the molten raw materials in the liquid transferring groove (21) into the liquid returning groove (13), discharging the molten raw materials into the extruder through the liquid returning groove (13), continuously moving forwards, extruding the molten raw materials through an extrusion opening of the extruder, thus finishing preparation of plastic master batches, and collecting and storing the prepared plastic master batches.
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Effective date of registration: 20231019 Address after: Room 625, 6th Floor, Building 1, No. 655 Yinxiang Road, Jiading District, Shanghai, 201800 Applicant after: Hanmai Chemical Technology (Shanghai) Co.,Ltd. Address before: 210000 room 1401, caihongyuan community, building 7, Jiqingmen street, Jianye District, Nanjing, Jiangsu Province Applicant before: Tan Jiewen |
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