CN106738764B - Short fiber radial orientation reinforced tread rubber extrusion molding device - Google Patents
Short fiber radial orientation reinforced tread rubber extrusion molding device Download PDFInfo
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- CN106738764B CN106738764B CN201611166936.7A CN201611166936A CN106738764B CN 106738764 B CN106738764 B CN 106738764B CN 201611166936 A CN201611166936 A CN 201611166936A CN 106738764 B CN106738764 B CN 106738764B
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- 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
- B29C48/30—Extrusion nozzles or dies
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Abstract
The invention relates to a short fiber radial orientation reinforced tread rubber extrusion molding device, which comprises an inlet section, a transition section, an orientation section and a die plate which are connected together, the orientation section is internally provided with a continuous dam, a flow passage of the orientation section is formed by an adjusting block and a continuous dam structure which is symmetrical with a mirror surface, the invention can realize the radial orientation process of the fiber in the existing remanufactured tire tread forming equipment without changing the mature remanufactured tire tread forming process, and utilizes the extrusion expansion capability of the short fiber in the sizing material to be enhanced when the short fiber passes through the wave crest and the wave trough under the specific size and proportion, and the optimal machine head size to enable the short fiber to be better oriented in the radial direction.
Description
Technical Field
The invention relates to an extrusion molding device for short fiber radial orientation reinforced tread rubber, in particular to an extrusion molding device for remanufacturing a tire tread by applying short fiber radial orientation.
Background
With the rapid development of the automobile industry, the annual output of waste tires in China is the most global. The waste tires are used as solid wastes, are black pollution, and how to clean and recycle the waste tires at high value becomes a great problem. Among them, retreading is the preferred way of recycling waste tires, has the advantages of environmental protection and resource saving, and has become a waste tire recycling way commonly adopted in developed countries. Usually, the service life of the tire can be 60-90% equivalent to that of a new tire every time the tire is retreaded, and the performances of wear resistance, safety and the like do not influence the normal use of the tire. In the aspects of raw material and energy consumption, the retreaded tire is respectively 15-30% and 20-30% of the retreaded tire manufactured by the same specification, but the price is only 20-50%, and a large number of researches show that the short fiber reinforced rubber composite material is one of ideal materials for preparing the high-performance retreaded tire. Short fibers are added into the rubber material, and are properly oriented in the rubber material, so that the rolling resistance of the tire can be obviously reduced, and reportedly, for car tires, the rolling resistance is reduced by 5-7%, and the fuel can be saved by 1%; for the heavy tire, the rolling resistance is reduced by 2-4%, and the fuel can be saved by 1%. Whereas in each component of the tire, the rolling resistance produced by the tread represents 49% of the total rolling resistance. Therefore, the rolling resistance of the tire tread is effectively reduced, and important influences are generated on energy conservation and emission reduction, so that the method has great significance for China with increasingly deficient petroleum resources; the tear resistance, the wear resistance and the anti-chipping and anti-chipping performance of the tire tread are improved, the tire can be lightened, the running noise can be reduced, and the riding comfort is improved, so that the consumption requirements of the masses of people are met, and the national production requirements of energy conservation, emission reduction and environmental protection are met.
CN101352927A discloses a radial orientation extrusion molding method of short fiber reinforced rubber composite material, which comprises the steps of firstly carrying out extrusion processing on a rubber melt containing short fibers in an extruder; extruding rubber into an axial orientation flow channel at the tail end of a screw in an extruder barrel, and realizing the axial orientation of short fibers in the axial orientation flow channel of the machine head by utilizing the flow direction orientation of rubber; the rubber material after axial orientation passes through a dam formed by the thickness of a contraction flow channel under the action of extrusion pressure, and short fibers in the rubber material are rolled and inclined in the process that the rubber material rapidly expands after passing through the dam by utilizing the characteristic of rubber extrusion expansion; the expanded sizing material continues to flow along the flow channel, the inclination is intensified at the middle and edge parts of the flow channel due to the velocity gradient, the radial orientation of the short fibers is increased, and further the radial orientation is realized.
CN101337435A discloses a radial orientation extrusion molding device of short fiber reinforced rubber composite material, eight threaded holes are formed on the front surface of a flange, eight double-head screws and nuts are used for sequentially connecting the flange with a transition section, a dam blocking supporting plate, a shaping plate and a machine head pressing plate together, a glue overflow valve is arranged right above the flange, and a threaded hole is drilled right below the flange for installing a pressure sensor; a pair of dam blocking adjusting blocks are arranged in the middle of the dam blocking supporting plate, one end of a dam blocking adjusting bolt is fixed with the dam blocking adjusting blocks, the other end of the dam blocking adjusting bolt is connected with the dam blocking supporting plate through threaded connection, and the dam blocking adjusting bolt controls a dam blocking gap; a pair of shaping adjusting blocks are placed in the middle of the shaping plate to adjust the shaping gap, and the shaping adjusting blocks are clamped between the dam blocking supporting plate and the machine head pressing plate and fixed by screws.
CN102431145A discloses a radial orientation forming device for short fibers in tire tread rubber, which comprises a nose inlet section composed of a nose pressure adjusting bolt, a nose pressure adjusting valve and a rubber filtering plate, a radial orientation section composed of an orientation gap adjusting block, an orientation gap adjusting screw, a shunting type block and an orientation gap supporting plate, and a shaping section composed of a shaping gap adjusting block, a shaping gap adjusting screw and a shaping gap supporting plate; eight through holes are uniformly distributed on the flange plate, the flange plate is fixedly connected with the extruder body by eight bolts respectively, the inlet section of the extruder head is connected with the flange plate and fixed by a reinforcing rib plate, a heating and cooling water circulation channel is arranged in the inlet section of the extruder head, a glue filter plate is arranged at the inlet end of the heating and cooling water circulation channel, and the pressure regulating valve of the extruder head is respectively connected with the pressure regulating bolt of the extruder head and the inlet section of the extruder head.
The method and principle of short fiber radial orientation in the invention patent utilize the characteristic of rubber extrusion expansion to make the short fiber in the tread rubber roll along the expansion direction in the rubber expansion process to present the inclination trend, and finally make the short fiber radial orientation, but the prior art does not disclose the compression energy of the short fiber rubber material under the specific proportion when the continuous dam in the orientation section is a mirror symmetry unequal-height double-peak wave structure, that is, the strength of the extrusion expansion capability of the short fiber passing through the peak and the trough under the specific size and proportion in the rubber material.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a short fiber radial orientation reinforced tread rubber extrusion molding device which comprises an inlet section, a transition section, an orientation section and a die plate which are connected together, wherein the inlet section is provided with a filter plate for carding short fibers along the extrusion direction, and a continuous dam-blocking structure is arranged in the orientation section, so that the short fibers in rubber materials turn over along with the compression and expansion of the rubber materials, the rubber materials are shaped in the die section, and finally the short fibers are oriented in the rubber matrix in the radial direction, namely the direction perpendicular to the extrusion direction.
It is preferable that: the continuous dam blocking structure is a mirror-symmetric unequal-height double-wave-peak wave structure, the length of a first dam blocking section of 2 sections is 30mm, the length of a second dam blocking section is 25mm, the peak value of each dam blocking section is reduced step by step, the maximum distance between two peak values of mirror symmetry is 50mm and 40mm respectively, the valley value is increased step by step, the maximum distance between two valley values of mirror symmetry is 30mm, 20mm and 10mm respectively, the mouth mold is arranged in the outlet direction of the rubber material in the middle, the flow channel of the orientation section is formed by the continuous dam blocking structure of mirror symmetry, the outer side of the continuous dam blocking adjusting block is connected with one end of the adjusting column through the pressing plate, the other end of the adjusting column is connected with the middle plate through threads, and the middle plate, the mouth mold plate and the fixing.
It is preferable that: the inlet section is a flange, the center of the flange is a sizing material inlet, the sizing material inlet is communicated with the flow channel of the transition section through a filter plate, the filter plate is a perforated plate, the aperture is smaller than the length of the short fibers and larger than the particle size of the short fibers, and the preferred size is 1.0-3.6 mm.
It is preferable that: the runner of the inlet section shrinks gradually, and a glue overflow device communicated with the runner is arranged above the inlet section and comprises a glue overflow valve and an adjusting bolt matched with the glue overflow valve.
It is preferable that: the transition section comprises a fixed plate and a flow channel formed by the inner side of the fixed plate, and a temperature sensor and a pressure sensor are arranged on the outer side of the fixed plate.
Compared with the prior art, the invention has the following advantages: the method has the advantages that firstly, the radial orientation process of fibers can be realized in the existing remanufactured tire tread forming equipment, and the mature remanufactured tire tread forming process is not changed; the device has small volume, simple structure and lower requirement on the technical level of operators, thereby ensuring the good quality stability of the extruded tread rubber material; and thirdly, the orientation process is simple and feasible, the rubber is enabled to receive the action of a tensile flow field with negative velocity gradient in the flowing process by utilizing rheological analysis of short fiber suspension, the fibers are oriented in the radial direction, the compression energy of the short fiber sizing material under a specific proportion when the sizing material passes through a continuous dam and is in a mirror symmetry unequal-height double-peak wave structure, namely the extrusion expansion capacity of the short fibers in the sizing material is enhanced when the short fibers pass through peaks and troughs under a specific size and proportion, and the short fibers are enabled to be oriented in the radial direction better by utilizing the optimal head size.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is an electron microscope picture of cross sections of the mixed rubber material parallel to the extrusion direction under different size proportions of mirror-symmetrical peaks and troughs of the device of the invention, wherein a, b and c are electron microscope pictures when the distances between two mirror-symmetrical troughs are respectively 30mm, 20mm and 10mm, and the distances between two mirror-symmetrical peaks are respectively 50mm and 40mm, 50mm and 30mm, 50mm and 50mm, 40mm and 50 mm;
1 filter plate, 2 flanges, 3 glue overflow valve adjusting bolts, 4 glue overflow valves, 5 temperature sensors, 6 adjusting columns, 7 continuous dam blocking adjusting blocks, 8-port templates, 9 nuts, 10 studs, 11 gaskets, 12 ports, 13 pressing plates, 14 intermediate plates, 15 fixing plates, 16 pressure sensors and 17 runner plates.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the invention provides a short fiber radial orientation reinforced tread rubber extrusion molding device, which comprises an inlet section, a transition section, an orientation section and a mouth template 8 which are connected together, wherein the inlet section is provided with a filter plate 1 for carding short fibers along the extrusion direction, and the orientation section is internally provided with a continuous dam-blocking structure 7, so that the short fibers in rubber materials overturn along with the compression and expansion of the rubber materials, the rubber materials are shaped in the mouth template section, and finally the short fibers are oriented in the rubber matrix in the radial direction, namely the direction vertical to the extrusion direction.
The continuous dam-blocking structure is a mirror symmetry unequal-height double-wave-peak wave structure, the length of a first section of a 2-section dam is 30mm, the length of a second section of the dam is 25mm, the peak value of each section of the dam is gradually reduced, the maximum distance between two mirror-symmetric peak values is respectively 50mm and 40mm, the valley value is gradually increased, the maximum distance between two mirror-symmetric valley values is respectively 30mm, 20mm and 10mm, a mouth mold is arranged in the outlet direction of rubber material in the middle, a flow passage of an orientation section is formed by the mirror symmetry continuous dam-blocking structure, the outer side of a continuous dam-blocking adjusting block is connected with one end of an adjusting column 6 through a pressing plate, the other end of the adjusting column 6 is connected with an intermediate plate 14 through threads, the intermediate plate 14, a mouth mold plate 8 and a fixing plate 15 of a transition section are connected through a screw bolt, as shown in figure 3, the invention can be seen by mixing an electron microscope picture of rubber material cross, under the condition of the maximum unequal-height double-crest wave structure ratio of the distance, the extrusion expansion capacity of the short fibers is maximum, and the radial orientation degree of the short fibers of the extruded adhesive tape is maximum.
The inlet section is a flange 2, the center of the flange 2 is a sizing material inlet, the sizing material inlet is communicated with the flow channel of the transition section through a filter plate 1, the filter plate 1 is a perforated plate, the aperture is smaller than the length of the short fiber and larger than the particle size of the short fiber, and the preferred size is 1.0-3.6 mm.
The runner of the inlet section shrinks gradually, a glue overflow device communicated with the runner is arranged above the inlet section, and the glue overflow device comprises a glue overflow valve 4 and an adjusting bolt 3 matched with the glue overflow valve.
The transition section comprises a fixed plate 15 and a flow channel formed by the inner side of the fixed plate 15, and a temperature sensor 5 and a pressure sensor 16 are arranged on the outer side of the fixed plate 15.
The orientation component of the short fiber radial orientation reinforced tread rubber extrusion molding device mainly comprises a filter plate 1, a continuous dam-blocking orientation plate 8 and an adjusting part, the connection relationship of the device is that the front end of a flange 2 is connected with the head of an extruder by bolts, the rear end of the flange is welded with a runner plate 17, a glue overflow valve 4 and a glue overflow valve adjusting bolt 3 are arranged above the runner plate 17, the pressure in the orientation head is adjusted, the pressure in the orientation device is reduced by adjusting the glue overflow valve adjusting bolt 3 when the pressure is too high, a temperature sensor 5 and a pressure sensor 16 are fixed on a fixed plate 15, the temperature and the pressure in the orientation device are monitored in real time, the potential can be increased when the short fiber moves to a trough along with the glue material after the glue material flows through the continuous dam-blocking orientation plate 8, and then the larger tensile stress is obtained after the short fiber flows through a wave crest section, so that the turnover degree under the action of shearing and tensile flow fields is further increased after, the forming process of fiber orientation in the tread rubber of the remanufactured tire is realized. The other side of the runner plate is provided with 6 threaded holes which are connected with studs 10, and the studs are sequentially fixed with a fixed plate 15, an intermediate plate 14 and a port template 8 and are finally fixed by nuts 9. The die 12 is fixed to the die plate. Meanwhile, cooling water holes are formed in the runner plate 17 and the opening template 8, and the temperature control of the orientation device is realized under the external temperature control device. The working principle of the adjusting part is as follows: the adjusting column 6 is in threaded connection with the middle plate 14, the up-and-down movement of the adjusting column can be realized through threaded connection, and the adjusting column 6 is connected with the continuous dam blocking adjusting block 7 through the pressing plate 13, so that the circumferential movement of threads is converted into the up-and-down movement of the continuous dam blocking adjusting block 7.
As shown in fig. 2, the orientation principle of the device of the present invention: the glue is through the foraminiferous filter plate of material entry section, and the filter plate aperture is less than short-staple length, is greater than the short-staple particle diameter for the short-staple is along extruding direction orientation, and after flowing into the orientation section, the short-staple moves to the trough section potential energy along with the sizing material and increases, so that obtain bigger tensile stress when passing through the crest section, because the dam crest that hinders in succession hinders the dam structure reduces step by step, the valley value increases step by step, make the short-staple flow through further increase under the effect of shearing and tensile flow field after multistage hindering the dam, extrude the bush, realize the radial orientation of short-staple. It is noted that the device and
the cold feeding pin extruder is matched.
The method comprises the specific steps of firstly adding remanufactured tire tread rubber containing short fibers into an extruder, extruding and plasticizing through a screw, extruding the remanufactured tire tread rubber subjected to extrusion processing into a filter plate at the tail end of the screw in a cylinder of the extruder, and realizing the axial orientation of the short fibers in rubber materials; the rubber material flows through the continuous dam with gradually reduced gaps under extrusion pressure, so that the potential energy of rubber is increased while the rubber material can be ensured to fully flow, the turning degree of short fibers is further increased under the action of shearing and stretching flow fields after the short fibers flow through the multistage dam, and the radial orientation of the short fibers is realized.
The extrusion process flow of the short fiber radial orientation reinforced remanufactured tire tread extrusion molding device is as follows:
1. adding the remanufactured tire tread rubber containing short fibers into a cold feed extruder, setting the extruder to be XJW60-200 and the rotating speed of a screw to be 15 r/min, and realizing extrusion processing molding of the remanufactured tire tread rubber material through rotation and shearing of the screw;
2. conveying the rubber material for remanufactured tire tread by a screw rod, and then feeding the rubber material into the device, wherein the rubber material passes through a filter plate 1 with a certain aperture to straighten short fibers;
3. the pressure in the machine head is adjusted by adjusting the rubber overflow valve bolt 3, so that the pressure is maintained at 3-10MPa, and the quality of rubber materials and the normal and safe operation of equipment are ensured;
4. then the rubber material on the tire surface reaches an orientation section through a transition section, the continuous dam-blocking structure of the continuous dam-blocking adjusting block 7 can ensure sufficient rubber material flowing, the rubber material is compressed and extruded to expand after passing through the continuous dam-blocking adjusting block 7, and short fibers are radially extruded out of a machine head through a neck mold 12;
the above embodiments are merely illustrative, not restrictive, of the technical solutions of the present invention, and any modifications or partial replacements without departing from the spirit of the present invention should be covered within the scope of the claims of the present invention.
Claims (1)
1. Short fiber radial orientation reinforcing tread rubber extrusion moulding device which characterized in that: including the entry section, changeover portion, orientation section and the mouth template that link together, the entry section sets up one and combs the filter plate of short-staple along extrusion direction, sets up in the orientation section and hinders the dam structure in succession, and the short-staple in the sizing material takes place the upset along with the compression expansion of sizing material, and the sizing material can be stereotyped, its characterized in that in mouth template department: the continuous dam in the orientation section is of a mirror symmetry unequal-height double-wave-peak wave structure; the dam-blocking peak of the continuous dam-blocking structure in the orientation section is gradually reduced, the valley value is gradually increased, the first section of the two sections of dams is 30mm long, the second section of the two sections of dams is 25mm long, the peak value of each section of dams is gradually reduced, the maximum distance between two mirror-symmetrical peak values is respectively 50mm and 40mm, the valley value is gradually increased, the maximum distance between two mirror-symmetrical valley values is respectively 30mm, 20mm and 10mm, a neck mold is arranged in the outlet direction of a glue material in the middle, a flow channel of the orientation section is formed by the mirror-symmetrical continuous dam-blocking structure, the outer side of a continuous dam-blocking adjusting block is connected with one end of an adjusting column through a pressing plate, the other end of the adjusting column is connected with an intermediate plate through threads, and the intermediate plate, a mouth; the outer side of the continuous dam blocking structure is connected with one end of an adjusting column through a pressing plate, the other end of the adjusting column is connected with an intermediate plate through threads, and the intermediate plate, the mouth template and the fixing plate of the transition section are connected through a stud; the inlet section is a flange, the center of the flange is a sizing material inlet, and the sizing material inlet is communicated with the flow channel of the transition section through a filter plate; the flow channel of the inlet section gradually shrinks, a glue overflow device communicated with the flow channel is arranged above the inlet section, and the glue overflow device comprises a glue overflow valve and an adjusting bolt matched with the glue overflow valve; the transition section comprises a fixed plate and a flow channel formed by the inner side of the fixed plate, and a temperature sensor and a pressure sensor are arranged on the outer side of the fixed plate;
the extrusion process flow of the short fiber radial orientation reinforced tread rubber extrusion molding device comprises the following steps:
1) adding the remanufactured tire tread rubber containing short fibers into a cold feed extruder, setting the extruder to be XJW60-200 and the rotating speed of a screw to be 15 r/min, and realizing extrusion processing molding of the remanufactured tire tread rubber material through rotation and shearing of the screw;
2) conveying the rubber material for remanufactured tire tread into the extrusion molding device through a screw, and straightening short fibers by the rubber material through a filter plate with a certain aperture;
3) the pressure in the machine head is adjusted by adjusting the bolt of the glue overflow valve, so that the pressure is maintained at 3-10MPa, and the quality of the glue material and the normal and safe operation of the equipment are ensured;
4) and then the rubber material on the tire surface reaches the orientation section through the transition section, the continuous dam blocking structure of the continuous dam blocking adjusting block can ensure sufficient rubber material flowing, the rubber material is compressed and extruded to swell after passing through the continuous dam blocking adjusting block, and short fibers are radially extruded through an oral die.
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| CN201611166936.7A CN106738764B (en) | 2016-12-16 | 2016-12-16 | Short fiber radial orientation reinforced tread rubber extrusion molding device |
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| CN108582721A (en) * | 2018-03-06 | 2018-09-28 | 嘉兴希卡姆复合材料有限公司 | A kind of special extrusion equipment of PP composite material |
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| CN106626442B (en) * | 2016-12-16 | 2019-07-26 | 青岛科技大学 | The radial oriented enhancing tread rubber extruding forming method of staple fiber |
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| CN101352927A (en) * | 2008-08-17 | 2009-01-28 | 青岛科技大学 | Method for extruding and forming short fiber reinforced-rubber composite material in radial direction |
| JP5785408B2 (en) * | 2011-03-23 | 2015-09-30 | Ykk株式会社 | Resin frame material, joinery, and method of manufacturing resin frame material |
| CN102431145A (en) * | 2011-11-22 | 2012-05-02 | 青岛科技大学 | Device for performing radial orientation molding on short fibers of tire tread rubber |
| CN104512026A (en) * | 2013-09-27 | 2015-04-15 | 青岛蓝农谷农产品研究开发有限公司 | Preparation method of thread rubber of truck tire |
| CN105643897B (en) * | 2016-03-24 | 2018-05-08 | 青岛科技大学 | Fiber reinforcement remanufactures tire tread radial extruding forming method and device |
| CN206374171U (en) * | 2016-12-16 | 2017-08-04 | 青岛科技大学 | The radial oriented enhancing tread rubber extrusion molding apparatus of chopped fiber |
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| CN106626442B (en) * | 2016-12-16 | 2019-07-26 | 青岛科技大学 | The radial oriented enhancing tread rubber extruding forming method of staple fiber |
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Effective date of registration: 20230406 Address after: Room 810, 8th floor, Jingkong Building, No. 57 Lushan Road, Huangdao District, Qingdao, Shandong Province, 266000 Patentee after: Qingdao Guocheng Zhongjia High tech Development Co.,Ltd. Address before: 266061 Songling Road, Laoshan District, Qingdao, Shandong Province, No. 99 Patentee before: QINGDAO University OF SCIENCE AND TECHNOLOGY |