CN106738763B - Short fiber radial orientation enhanced annular tire tread extrusion molding and prevulcanization integrated device - Google Patents

Short fiber radial orientation enhanced annular tire tread extrusion molding and prevulcanization integrated device Download PDF

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Publication number
CN106738763B
CN106738763B CN201611166584.5A CN201611166584A CN106738763B CN 106738763 B CN106738763 B CN 106738763B CN 201611166584 A CN201611166584 A CN 201611166584A CN 106738763 B CN106738763 B CN 106738763B
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section
shaping
flow
plate
tread
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CN106738763A (en
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汪传生
边慧光
田晓龙
李泽汉
沈波
李利
张德伟
李绍明
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Qingdao Guocheng Zhongjia High Tech Development Co ltd
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Qingdao University of Science and Technology
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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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/695—Flow dividers, e.g. breaker plates
    • 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
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/87—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • B29L2030/002—Treads

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses an extrusion molding and prevulcanization integrated device for a short fiber radial orientation reinforced annular tire tread, which comprises an inlet section, a transition section, a flow distribution section, a shaping section and a prevulcanization device, wherein a cylindrical flow passage in the flow distribution section is deformed by 90 degrees, a flow distribution column with a hexagonal cross section is arranged at the center in the flow passage of the deformed flow distribution section, the tail end of the flow distribution column is connected with the shaping section, the shaping section consists of an upper shaping plate, a lower shaping plate and a plate die cavity, the center of the flow passage in the shaping section is taken as a starting point, rubber materials are extruded along six flow passages with equal cross sections, a flow passage opening is opposite to a hexagonal edge, the cross section area of the flow distribution column is 1/2 of the cross section area of a cylindrical structure, and a prevulcanization device for a block tire pattern surface is matched outside the shaping section, the device overcomes the technical problem that the orientation degree is reduced because the movement direction of short fibers is changed when the short fiber rubber materials are vulcanized in a tire segmented mold in the prior art, the radial orientation degree of the fiber reinforced tread rubber is improved, and a novel method for radial orientation of short fibers is provided.

Description

Short fiber radial orientation enhanced annular tire tread extrusion molding and prevulcanization integrated device
Technical Field
The invention relates to an extrusion molding and prevulcanization integrated device for a fiber orientation reinforced remanufactured tire tread, in particular to an extrusion molding and prevulcanization integrated device for a short fiber radial orientation reinforced annular tire tread
Background
With the rapid development of the automobile industry, the annual output of waste tires in China is the most global. Waste tires are a kind of black pollution as solid waste. How to clean and recycle the waste tires at high value becomes a major problem, and the recycling of the waste tires at present mainly comprises ways of tire retreading, rubber powder production, reclaimed rubber production, waste tire cracking and the like. Among them, retreading is the preferred mode of recycling waste tires, has the advantages of being most environmentally friendly, most resource saving and the like, and has become a waste tire recycling mode 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 aspect 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 amount 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 sizing material, and are properly oriented in the sizing 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 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 for short fiber reinforced rubber composite, wherein eight threaded holes are formed on the front face of a flange, eight double-headed screws and nuts are used to sequentially connect the flange with a transition section, a dam blocking support plate, a shaping plate and a machine head pressure plate together, a glue overflow valve is installed 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 molding device for short fibers in tire tread rubber, which comprises a machine head inlet section composed of a machine head pressure adjusting bolt, a machine head 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 flow dividing 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.
In the invention patent, the method and the principle of the radial orientation of the short fibers are that the characteristic of rubber extrusion expansion is utilized, so that the short fibers in the tread rubber roll along the expansion direction in the rubber expansion process, and show a tendency of inclination, and finally the short fibers are oriented in the radial direction; however, even if the extruded rubber material can be radially oriented better, in the prior art, if a common extrusion rubber strip needs to be vulcanized, an extruder needs to be connected with a tire segmented mold through a pipeline, the extrusion rubber strip slowly fills a cavity of the whole tire mold through a mold sleeve or an upper mold and a lower mold of the tire segmented mold, short fibers in the rubber material change in the moving direction of the tire segmented mold, the orientation state of the short fibers changes, the short fibers have no significance in actual production and cannot be applied to large-scale industrial production, and the original radial orientation machine head has higher requirements on processing precision and higher manufacturing cost.
Disclosure of Invention
In order to change the traditional method and principle of radial orientation of short fibers and overcome the technical problem that the movement direction of the short fibers is changed when short fiber sizing materials are vulcanized in a tire segmented mold in the prior art, the invention provides an extrusion molding and prevulcanization integrated device for a short fiber radial orientation reinforced annular tire tread, which comprises an inlet section, a transition section, a flow distribution section and a shaping section, and is characterized in that: the tail end of the transition section is connected with the flow dividing section, a cylindrical flow passage in the flow dividing section is deformed by 90 degrees firstly, a flow dividing column with a hexagonal cross section is arranged in the flow passage of the deformed flow dividing section, the flow dividing column is fixed at the center of the shaping section, the shaping section is connected with the flow dividing section through a hexagonal stud, the flow dividing column is in smooth transition with the center part of the shaping section, the tail end of the flow dividing column is connected with the shaping section, the shaping section is provided with six flow passages with equal cross sections, a flow passage opening is opposite to a hexagonal edge, the cross section area of the flow dividing column is 1/2 of the cross section area of a cylindrical structure, a prevulcanization device of a pattern surface of a segmented tire is matched outside the shaping plate, and the prevulcanization device is embedded with the upper shaping plate and the lower shaping plate; the top of the flow distribution column in the flow distribution section is a hexagonal pyramid, so that rubber materials are uniformly guided into each flow channel of the shaping section by the flow distribution column, the tail end of the transition section is connected with the flow distribution section, the cylindrical flow channel in the flow distribution section is deformed by 90 degrees firstly, and is smoothly transited from transverse extrusion to longitudinal extrusion, and the phenomenon that the rubber is burnt due to material accumulation in the extrusion process is prevented.
It is preferable that: the utility model discloses a tire retreading device, including retreading the tread bed die, retreading the tread and going up mould and shelves offset plate, two-layer inside and outside the mould divides on the retreading tread, the offset plate embedding is refurbished between the tread and the mould ectonexine, the equipartition extends to the last mould of retreading the tread in six runner mouths of section of design, the mould inlayer is six runners on the retreading tread, link to each other with six runners of section of design, the offset plate can seal six runners downwards, the skin is annular prevulcanization tread die cavity, the die cavity height when retreading the tread when upper and lower mould compound die is the 9/10 of the height of die cavity between upper and lower stereotype, the prevulcanization tread can be blocked at last and shift out the tread.
It is preferable that: 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.
It is preferable that: the inlet section is of a conical structure, and the transition section is of a cylindrical structure.
It is preferable that: the sizing material is extruded along six runners with equal cross sections by taking the center as a starting point in the sizing section, the included angle of the center of each runner is 60 degrees, the height of a cavity between the upper sizing plate and the lower sizing plate is 1/4 which is fully filled with the diameter of the runner of the flow distribution section, and at the moment, the sizing material cannot expand during transition from the transition section to the sizing section, so that the fiber directions are kept consistent as much as possible.
It is preferable that: the transition section is provided with a temperature sensor and a pressure sensor in the area of the flow channel, so that the temperature and the pressure of the rubber in the device can be monitored in real time.
It is preferable that: and a glue overflow device communicated with the flow passage is arranged above the transition section, and comprises a glue overflow valve and an adjusting bolt matched with the glue overflow valve.
It is preferable that: cooling water holes are arranged on the inlet section, the transition section and the flow dividing section.
It is preferable that: the shaping section consists of an upper shaping plate, a lower shaping plate and a mould cavity between the plates.
The connection relationship among all the parts is that a flange is connected with an extruder, threaded holes are formed in corresponding positions of an inlet section, a transition section and a shunting section inlet and outlet, the threaded holes in the horizontal end of the shunting section are connected with the flange through studs and are screwed up through nuts. Threaded holes are respectively formed in the upper part and the lower part of the shaping section, blind holes are formed in the positions, corresponding to the bottoms of the shunting sections, of the blind holes, and the shunting sections and the shaping section are connected and screwed down through hexagon socket head bolts.
The orientation principle of the device of the invention is as follows: the extruder is positioned right above the annular tire tread pre-vulcanizing device, the shaping section is inserted into a shaping strand matched with the extruder, rubber materials are extruded from the periphery of the shaping section along the extruder, when short fiber rubber materials flow through a flow channel with uniform and unchangeable cross section area, the speed distribution is gentle, a shearing flow field is mainly formed, therefore, the short fibers are oriented along the extrusion direction, and when the short fibers are extruded from the center of the annular pre-vulcanizing device to the periphery, the radial orientation of the short fiber tread rubber is completed.
Compared with the prior art, the invention has the following advantages: the short fiber orientation principle is simple, the most common horizontal extrusion from one end is changed into uniform extrusion from the center to the periphery, and the short fiber orientation principle is ingeniously applied to an annular tire tread pre-vulcanizing device through the change of the extrusion mode, so that the orientation degree of the fiber is improved; the device has the advantages that the technical problem that the movement direction of short fibers is changed when the short fiber rubber material is vulcanized in a tire segmented mold in the prior art is solved, and the device has small volume, simple structure and low requirement on the technical level of operators, so that the good quality stability of the extruded tread rubber material is ensured; thirdly, can replace the design section part, can design suitable design section according to the size and the requirement of annular tire tread prevulcanization device, satisfy different processing requirements to simple structure has reduced the processing cost of high accuracy, is suitable for industrial production, and is economical, convenient, practical.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a top view of the splitter column and lower sizing plate of the present invention;
FIG. 3 is a schematic view of the structure of the present invention;
FIG. 4 is a top view of the diverter column and upper mold for retread of the present invention;
the device comprises a flange 1, a glue overflow valve adjusting bolt 2, a glue overflow valve 3, a temperature sensor 4, a transition section 5, a shunting section 6, a nut 7, a stud 8, a gasket 9, an upper sizing plate 10, a retreaded tread lower mold 11, a retreaded tread upper mold 12, a rubber plate 13, a lower sizing plate 14, a shunting column 15, a hexagon socket head cap screw 16, a pressure sensor 17 and an inlet section 18.
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 annular tire tread extrusion molding and prevulcanization integrated device, which comprises an inlet section 18, a transition section 5, a flow distribution section 6 and a shaping section, wherein the tail end of the transition section 5 is connected with the flow distribution section 15, a cylindrical flow passage in the flow distribution section 6 is deformed by 90 degrees first, a flow distribution column 15 with a hexagonal cross section is arranged in the flow passage of the deformed flow distribution section, the flow distribution column 15 is fixed at the center of the shaping section, the shaping section is connected with the flow distribution section 6 through a hexagonal stud, the flow distribution column 15 is in smooth transition with the center part of the shaping section, the tail end of the flow distribution column 15 is connected with the shaping section, the shaping section has six equal-section flow passages, flow passage openings are opposite to the hexagonal sides, the cross section area of the flow distribution column is 1/2 with the cross section area of a cylindrical structure, the shearing action of the wall can be reduced due to the excessive thickness of the short fiber rubber material, the orientation degree can be reduced, and the short fiber rubber glue with the polygonal sides (namely the width of the shaping flow passage) corresponding to the flow distribution column 15 under the proportion The material extrusion radial orientation effect is best, and under the action of the pushing force of the sizing material, the sizing material is extruded from the center to the periphery along the flow channel of the shaping section. A prevulcanization device for the pattern surface of the block tire is matched outside the shaping plate, and the prevulcanization device is embedded with the upper shaping plate 10 and the lower shaping plate 14; the top of the internal shunt column 15 of the shunt section is a hexagonal pyramid, so that rubber materials can be uniformly guided into each flow channel of the shaping section by the shunt column, the tail end of the transition section 5 is connected with the shunt section 6, the cylindrical flow channel in the shunt section 6 is deformed by 90 degrees firstly, and is smoothly transited from transverse extrusion to longitudinal extrusion, and the phenomenon of rubber burning caused by material accumulation in the extrusion process of rubber is prevented.
As shown in fig. 1, 2, 4, integrative device is including retreading tread bed die 11, retreading tread upper die 12 and shelves offset plate 13, and retreading tread upper die 12 is two-layer inside and outside, shelves offset plate 13 embedding retreading tread upper die 12 between the ectonexine, in six runner mouths of equipartition in the shaping section extend to the last die 12 of retreading the tread, and retreading tread upper die 12 inlayer is six runners, links to each other with six runners of shaping section, and shelves offset plate 13 can seal six runners downwards, and the skin is annular precuring tread die cavity, and the die cavity height when retreading tread upper and lower die compound die is the 9/10 of the height of die cavity between upper and lower shaping plate. Because the heights of the two parts cannot be the same due to the limitation of a vulcanization process, the radial orientation of extruded tread short fibers can be kept to the maximum extent when rubber enters a cavity under the height proportion, and the extrusion amount can be kept to the maximum extent.
The flow passage of the inlet section 18 gradually shrinks, and a glue overflow device communicated with the flow passage is arranged above the inlet section 18 and comprises a glue overflow valve 3 and an adjusting bolt 8 matched with the glue overflow valve.
The transition section 5 is provided with a temperature sensor and a pressure sensor in the flow channel area, so that the temperature and the pressure of the rubber in the device can be monitored in real time.
The inlet section 18 and the transition section 5 are provided with cooling water holes on the flow dividing section 6, the inlet section is of a conical structure, and the transition section is of a cylindrical structure.
The shaping section consists of an upper shaping plate, a lower shaping plate and a mould cavity between the plates.
The flow-dividing column 15 and the central part of the shaping section are in smooth transition, so that the rubber burning phenomenon caused by material accumulation in the extrusion process is prevented.
As shown in figure 2, the sizing material is extruded along six runners with equal cross sections by taking the center as a starting point in the sizing section, the included angle of the center of each runner is 60 degrees, the height of a cavity between the upper sizing plate and the lower sizing plate is 1/4 which is the diameter of the runner of the full-filling flow distribution section, and at the moment, the sizing material cannot be extruded and expanded when being transited from the transition section to the sizing section, so that the fiber directions are kept consistent as much as possible.
The connection relationship among all the parts is that the flange 1 is connected with an extruder, threaded holes are formed in corresponding positions of an inlet 18, a transition section 5 and an inlet and an outlet of the flow dividing section 15, the threaded holes in the horizontal end of the flow dividing section 15 are connected with the flange 1 through studs and are screwed up through nuts. Threaded holes are respectively formed in the upper part and the lower part of the shaping section, blind holes are formed in the positions, corresponding to the bottoms of the shunting sections 6, of the shaping section, and the shunting sections and the shaping section are connected and screwed down through hexagon socket head bolts.
The connection relationship is that the front end of the flange 1 is connected with the extruder head by bolts, the rear end is connected with the inlet section 15, the glue overflow valve is arranged above the inlet section 15, and the pressure in the extruder head can be adjusted by adjusting the bolt through adjusting the glue overflow valve when the pressure of the extruder head is higher, so that the quality of the glue material and the normal work of the maintenance equipment are ensured. The temperature sensor 4 and the pressure sensor 14 are fixed on the transition section 5, the temperature and the pressure in the orientation device are monitored in real time, cooling water holes are formed in the inlet section 15, the transition section 5 and the flow dividing section 6, and the flowing temperature of the sizing material is controlled through an external temperature control device. After the rubber material enters the shunting section, the extrusion direction is changed from horizontal to vertical, the rubber material flows into the shaping section through the shunting column 12, and the extrusion direction is changed from vertical to horizontal and is extruded from the middle of the shaping section to the periphery.
The invention utilizes the pressure sensor on the prevulcanization device in the prior art to conduct to the elevator control system connected with the extruder, and the elevator control system moves the extruder upwards along the vertical direction, thereby being used for industrial production.
The orientation principle of the device of the invention is as follows: as shown in fig. 3, an extruder is positioned right above the annular tread prevulcanization device, the shaping section is inserted into the shaping section matched with the annular tread prevulcanization device, rubber is extruded from the periphery of the shaping section along the extrusion device, when short fiber rubber flows through a flow channel with uniform and unchangeable cross section area, the speed distribution is relatively gentle, and a shearing flow field is mainly formed, so that the short fibers are oriented along the extrusion direction, when the short fibers are extruded from the center of the annular prevulcanization device to the periphery, the radial orientation of the short fibers along the tread rubber is completed, after the vulcanization process is completed, the extruder is moved by a machine to ascend, the delicate flavor non-oriented vulcanized inner layer of the fibers formed on the inner layer of the die 12 on the retreaded tread is taken out, and the radially oriented prevulcanization tread rubber of the short fibers is formed by the outer layer and the die cavity inside.
In order to further explain the technical effect of the invention, the device extrudes the prevulcanized short fiber radial orientation retreaded tire and the vulcanized tire tread without short fiber is subjected to abrasion test, the test is carried out by cooperation of a Qingdao company, the prevulcanized tire tread is processed, a finished tire is manufactured, finished tires with two short fiber orientations of 18R24.5 and 14R24 are manufactured altogether, and the dynamic test is carried out on the finished tire and the corresponding common retreaded tire; selecting a container crane around a certain port of the Qingdao to carry out actual pavement abrasion test on a pavement of 16 square kilometers, and finally testing the thickness of the residual precured tread: 14R, the initial pattern depth of the tire is 16mm, the common retreaded tire is 8.1mm after the crane runs for 442 hours, and the short fiber orientation retreaded tire is 12.7 mm; the 18R tire initial pattern depth is 18mm, and after 570 hours of crane running: the common retreaded tire is 6.4mm, and the short fiber orientation retreaded tire is 10.6 mm.
The extrusion process flow of the short fiber radial orientation reinforced annular tire tread extrusion molding and prevulcanization integrated 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. the pressure in the machine head is adjusted by adjusting the bolt 2 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;
3. the rubber material enters the flow distribution section 15 through the transition section under the action of extrusion pressure, the extrusion direction is changed from the horizontal direction to the vertical direction, the rubber material enters the shaping section from the flow distribution section 15, passes through a flow distribution column 12 which is arranged at the center of the flow distribution section and is connected with the shaping section and is fixed at the center of the shaping section, the cross section of the rubber material is a hexagonal cross section, passes through the flow distribution column, the cross section of the rubber material is 1/2 of a cylindrical structure cross section, the rubber material is extruded from the transition section 5 to the shaping section, the rubber material is changed from the vertical direction to the horizontal direction, and the rubber material is extruded from the middle to the periphery through six flow passages of the shaping section;
4. extruding the rubber material from the middle to the periphery, filling the pre-vulcanizing device, conducting a pressure sensor on the pre-vulcanizing device to a lift control system connected with the extruder after the rubber material is fully compacted, moving the extruder upwards along the vertical direction by the lift control system, moving the rubber blocking plate 13 downwards at the moment, sealing the annular rubber material, and performing a pre-vulcanizing process of the annular tread rubber;
5. and the control system of the prevulcanization device controls the prevulcanization device to open the mold to form the prevulcanization short fiber radial orientation tread rubber.
Compared with the prior art, the invention has the following advantages: the method has the advantages that the short fiber orientation principle is simple, the most common horizontal extrusion from one end is changed into uniform extrusion from the center to the periphery, the extrusion mode is changed and ingeniously applied to the annular tire tread pre-vulcanizing device, the radial orientation degree of the fiber is improved, the technical problems that the movement direction of the short fiber is changed when the short fiber sizing material is vulcanized in a tire segmented mold in the prior art, the radial orientation of extrusion molding cannot play an actual role are solved, the extrusion molding and vulcanization are integrated, and the process flow is reduced; 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 shaping section can be partially replaced, and a proper shaping section can be designed according to the size and the requirement of the annular tire tread prevulcanization device, so that different processing requirements are met.
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. The utility model provides an integrative device of short fiber radial orientation reinforcing annular tread extrusion moulding prevulcanization, includes entry section, changeover portion, reposition of redundant personnel section, shaping section, its characterized in that: the tail end of the transition section is connected with the flow dividing section, a cylindrical flow passage in the flow dividing section is deformed by 90 degrees, a flow dividing column with a hexagonal cross section is arranged in the flow passage of the deformed flow dividing section, the top of the flow dividing column is a hexagonal pyramid, the flow dividing column is fixed at the center of the shaping section, the shaping section is connected with the flow dividing section through a hexagonal stud, the flow dividing column is in smooth transition with the center part of the shaping section, the tail end of the flow dividing column is connected with the shaping section, the shaping section consists of an upper shaping plate, a lower shaping plate and a plate die cavity, the flow dividing column is fixed at the center of the shaping section, the shaping section is connected with the flow dividing section through the hexagonal stud, the shaping section has six flow passages with equal cross sections, a flow passage opening is opposite to a hexagonal edge, the cross section area of the flow dividing column is 1/2 of the cross section of a cylindrical structure, a prevulcanization device of a block tire pattern surface is matched outside the shaping section, the prevulcanization device and the upper shaping plate, the lower shaping plate is embedded; the precuring device comprises a retreaded tread lower die, a retreaded tread upper die and a rubber baffle plate, wherein the retreaded tread upper die is divided into an inner layer and an outer layer, the rubber baffle plate is embedded between the inner layer and the outer layer of the retreaded tread upper die and uniformly distributed in six runner ports of a shaping section to extend into the upper die of the retreaded tread, the inner layer of the retreaded tread upper die is provided with six runners which are connected with the six runners of the shaping section, the rubber baffle plate can seal the six runners downwards, the outer layer is an annular precured tread cavity, and the height of the cavity when the retreaded tread upper die and the retreaded tread lower die are closed is 9/10 of the height of the cavity between the upper shaping plate and the lower shaping plate; the sizing section inner flow channel takes the center as a starting point, glue is extruded along six flow channels with equal cross sections, the included angle of the center of each flow channel is 60 degrees, and the height of a cavity between the upper sizing plate and the lower sizing plate is 1/4 of the diameter of the flow channel of the flow distribution section which is fully filled; 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; the inlet section is of a conical structure, and the transition section is of a cylindrical structure; the transition section is provided with a temperature sensor and a pressure sensor in the cylindrical runner area; a glue overflow device communicated with the flow passage is arranged above the transition section, and the glue overflow device comprises a glue overflow valve and an adjusting bolt matched with the glue overflow valve; and cooling water holes are formed in the inlet section, the transition section and the flow dividing section.
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CN109676890A (en) * 2019-02-28 2019-04-26 华迅工业(苏州)有限公司 A kind of rail traffic cable double-layer coextrusion outer mold
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GB1492614A (en) * 1974-02-22 1977-11-23 Babcock & Wilcox Ltd Flow dividing and mixing means
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NL1026334C2 (en) * 2004-06-04 2005-12-06 Vmi Epe Holland Tire drum assembly with storage mechanism for building an unvulcanized tire.
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
JP6424000B2 (en) * 2013-11-28 2018-11-14 豊田通商株式会社 Rubber structure reinforcing fiber and method for producing the same
CN106079353B (en) * 2016-08-15 2018-06-26 盐城工学院 It is a kind of to squeeze out co-extrusion die head and its extrusion method with double conductive section bars
CN206374170U (en) * 2016-12-16 2017-08-04 青岛科技大学 The radial oriented enhancing annular tire tread extrusion molding presulfurization integrated device of chopped fiber

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