CN112092277A - Process for manufacturing permeable plastic road surface layer particles - Google Patents
Process for manufacturing permeable plastic road surface layer particles Download PDFInfo
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- CN112092277A CN112092277A CN202010776308.0A CN202010776308A CN112092277A CN 112092277 A CN112092277 A CN 112092277A CN 202010776308 A CN202010776308 A CN 202010776308A CN 112092277 A CN112092277 A CN 112092277A
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- 239000002245 particle Substances 0.000 title claims abstract description 62
- 239000004033 plastic Substances 0.000 title claims abstract description 42
- 229920003023 plastic Polymers 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002344 surface layer Substances 0.000 title claims abstract description 20
- 238000001125 extrusion Methods 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 29
- 238000000465 moulding Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000010408 sweeping Methods 0.000 claims description 2
- 230000000704 physical effect Effects 0.000 abstract description 7
- 229920001971 elastomer Polymers 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 6
- 229920002943 EPDM rubber Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001730 Moisture cure polyurethane Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000037078 sports performance Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a process for manufacturing permeable plastic road surface layer particles, which belongs to the technical field of rubber product processing and comprises the following steps: adding the raw materials into an extruder, heating the raw materials to a molten state by the extruder, extruding the raw materials into a forming cavity with a preset shape of an extrusion body from a machine head body, cooling and forming, and demoulding to obtain particles with a preset shape; the preset shape is hexahedron or octahedron or a sphere with a convex surface; in order to solve the problem that only columnar particles with simple shapes and crushed particles with indefinite shapes can be obtained by the prior art, the manufacturing process can manufacture particle products with specific shapes, the particle products with specific shapes are suitable for the permeable plastic road surface layer, the physical properties of the tensile strength, the impact absorption rate and the skid resistance value of the permeable road surface plastic road surface can be obviously improved, the skid resistance value of the permeable road surface is obviously improved, the buffering and skid resistance performance of the road surface is improved, and the permeable plastic road surface is particularly suitable for the permeable plastic road surface of a pedestrian green-road bicycle lane.
Description
Technical Field
The invention relates to the technical field of rubber product processing, in particular to a manufacturing process for processing permeable plastic road surface layer particles with preset shapes.
Background
The plastic track is also named as all-weather track for track and field sports and consists of polyurethane prepolymer, mixed polyether, waste tyre rubber, EPDM rubber grain or PU grain, pigment, assistant and stuffing. The plastic track has the characteristics of good flatness, high compressive strength, proper hardness and elasticity and stable physical performance, is beneficial to the exertion of the speed and the technology of athletes, effectively improves the sports performance and reduces the tumble injury rate. The plastic track is made of materials such as polyurethane rubber, has certain elasticity and color, has certain ultraviolet resistance and aging resistance, and is an internationally recognized best all-weather outdoor sports ground floor material;
with the development of the technology, the plastic road surface is not limited to a sports ground any more, but is widely applied to ordinary urban roads, the plastic runway generally needs to have water and air permeability, most of the water and air permeable plastic roads generally adopt a way of spraying a cementing agent mixed with EPDM rubber particles as a road surface layer, the cementing agent mostly adopts PU glue, and the concrete method can be divided into single components or double components.
The prior art generally adopts two methods for processing rubber particles:
firstly, crushing the mixture by a crusher after extrusion molding to obtain particles with indefinite shapes;
secondly, extruding, forming and cutting the mixture into columnar particles; mostly prismatic or cylindrical;
both ways are limited by the process only to obtain simple shaped cylindrical particles and irregularly shaped crushed particles, so the invention considers that the controllable manufacturing of particles of specific shape by optimizing the process is suitable for plastic road surface layers, and the physical properties are optimized.
Disclosure of Invention
The invention provides a manufacturing process for processing permeable plastic road surface layer particles with preset shapes, which solves the technical problems that the plastic road surface layer particles are single in shape and are unshaped to influence the physical properties of a plastic road surface in the related technology.
According to one aspect of the invention, a process for manufacturing permeable plastic road surface layer particles is provided, which comprises the following steps:
adding raw materials into an extruder, heating the raw materials to a molten state by the extruder, extruding the raw materials into a molding cavity with a preset shape of an extrusion body from a machine head body connected with the output end of the extruder, and demolding after cooling molding to obtain particles with a preset shape;
the machine head body and the extrusion body are internally provided with channels for communicating the output end of the extruder and a molding cavity with a preset shape;
the extrusion body is provided with a fixed die and a movable die which can be separated, and the fixed die and the movable die are provided with die cavities which can be matched with each other to form a forming cavity;
the predetermined shape is hexahedron or octahedron or a sphere with a convex surface.
By adopting the technical scheme, the particles with specific shapes can be controllably manufactured, and the method is suitable for the plastic road surface course and optimizes the physical properties of the plastic road surface course. Solves the problem that the prior art can only obtain columnar particles with simple shapes and crushed particles with indefinite shapes.
Further, the protrusion of the sphere whose surface is provided with the protrusion is cylindrical or conical.
Furthermore, the front end of the machine head body is connected with the extrusion body, and a first channel communicated with the extrusion body is arranged in the machine head body;
the extrusion body comprises a central body, and a fixed die and a movable die which are arranged on the periphery of the central body, wherein at least more than two fixed dies are fixedly connected with the central body, the movable dies with the same number as the fixed dies are rotatably connected with the central body, a preset gap is formed between every two adjacent fixed dies, and the width of the preset gap is larger than that of the movable dies;
the mould cavity is arranged on the corresponding surface of the fixed mould and the movable mould, the movable mould rotates to a first preset position around the central body to be matched with the fixed mould on one side, rotates to a second preset position to be matched with the fixed mould on the other side, and the mould cavity of the fixed mould and the mould cavity of the movable mould form a forming cavity during matching;
a second channel communicated with the first channel is arranged in the extrusion body, and a channel communicated with the die cavity and the second channel is arranged in the fixed die or the movable die;
and a cleaning mechanism for cleaning and separating the product from the mold cavity is also arranged between the movable mold and the fixed mold.
Furthermore, the machine head body comprises a rear seat, a flow dividing body and a front seat which are sequentially connected from back to front, the rear seat is connected with an outlet of the extruder, the rear end of the first channel extends to the rear end face of the rear seat to form an opening, a porous plate is arranged on the opening, a conical body extending into the first channel is arranged at the rear end of the flow dividing body, the flow dividing body divides the first channel into a front first channel and a rear first channel, and at least more than two front first channels are communicated with one rear first channel through holes in the flow dividing body; the second channel on the extrusion body corresponds to the front first channel.
Further, a third channel for communicating the die cavity with the second channel is arranged in the fixed die; the material enters the third channel through the second channel and then enters the forming cavity to be formed into particles.
Furthermore, the cleaning mechanism comprises a cleaning shaft and at least two scraping plates, the cleaning shaft is provided with a power source for driving the cleaning shaft to rotate, the scraping plates correspond to one side of the fixed die cavity, and when the movable die moves to a first preset position, the cleaning shaft of the cleaning mechanism far away from the movable die rotates to drive the scraping plates to scrape and separate products in the die cavity of the fixed die.
Furthermore, two fifth channels which are respectively communicated with the die cavities on the two sides of the movable die are arranged in the movable die, and the fifth channels extend to the inner circular surface of the movable die;
the central body is also provided with fourth channels communicated with the second channels, each movable die corresponds to two fourth channels, and the fourth channels extend to the outer circular surface of the central body;
the movable die rotates to a first preset position around the central body, and a fifth channel of the movable die is communicated with one of the two corresponding fourth channels of the movable die;
the movable mould rotates to a second preset position around the central body, another fifth channel of the movable mould is communicated with another of the two fourth channels corresponding to the movable mould, so that when the movable mould rotates to the first preset position and the second preset position, the movable mould can be communicated with the second channel through one fourth channel to obtain a material, and the material enters the fourth channel through the second channel, then enters the fifth channel and then enters each forming cavity to be formed into particles.
Further, the sweeping mechanism includes:
the gas cavity is arranged in the handpiece body and is communicated with a gas source;
the first air channel is arranged in the central body and is communicated with the air cavity;
the second air channels are communicated with the first air channels, each movable die corresponds to two second air channels, and the second air channels extend to the outer circular surface of the central body;
two third air channels which are arranged in the movable mould and are respectively communicated with the mould cavities at the two sides of the movable mould, and the third air channels extend to the inner circular surface of the movable mould;
the movable mould rotates to a first preset position around the central body, and a third air channel communicated with the mould cavity at one side of the movable mould, which is far away from the fixed mould, is communicated with one of the two second air channels corresponding to the movable mould;
the movable mould rotates to a second preset position around the central body, a third air channel communicated with the mould cavity at one side of the movable mould far away from the fixed mould is communicated with the other one of the two second air channels corresponding to the movable mould, so that the movable mould can be communicated with the third air channel and the mould cavity at one side separated from the fixed mould through one second air channel when rotating to the first preset position and the second preset position, and a product in the forming cavity is extruded out by inputting high-pressure air through an air source and is separated from the movable mould through air pressure.
Furthermore, arc-shaped baffles are arranged on two sides of the movable die and are in interference fit with the outer surface of the central body, the fourth channel in an open state is closed by the baffles of the movable die when the movable die rotates to the first preset position or the second preset position, and the fixed die is provided with a slot matched with the baffles and can accommodate the baffles.
The invention has the beneficial effects that: the manufacturing process can manufacture the particle products with specific shapes, the particle products with specific shapes are suitable for the permeable plastic road surface layer, the physical properties of the tensile strength, the impact absorption rate and the skid resistance value of the permeable plastic road surface can be obviously improved, particularly the skid resistance value of the permeable plastic road surface is obviously improved, the buffering and skid resistance of the road surface is improved, and the particle products with specific shapes are particularly suitable for the permeable plastic road surface of a pedestrian green road bicycle lane.
Drawings
FIG. 1 is a schematic cross-sectional view of a water-permeable plastic road surface course particle producing apparatus having a passage communicating a cavity and a second passage in a stationary mold according to an embodiment of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a schematic cross-sectional view of FIG. 1;
FIG. 4 is an enlarged view at A of FIG. 3;
FIG. 5 is a schematic cross-sectional view of an apparatus for manufacturing water-permeable plastic road surface course particles, in which a passage communicating with a cavity and a second passage is provided in a movable mold according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of FIG. 5;
fig. 7 is another cross-sectional schematic view of fig. 5.
In the figure: the cleaning device comprises a machine head body 1, an extrusion body 2, a cleaning mechanism 3, a first channel 11, a rear seat 12, a porous plate 13, a shunting body 14, a front seat 15, a central body 21, a fixed mold 22, a movable mold 23, a mold cavity 24, a second channel 25, a rotating body 26, a cleaning shaft 31, a scraping plate 32, a gas cavity 33, a gas source 34, a first gas channel 35, a second gas channel 36, a third gas channel 37, a front first channel 111, a rear first channel 112, a conical body 141, a third channel 221, a fourth channel 211, a fifth channel 231 and a baffle 232.
Detailed Description
The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thereby implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as needed. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with respect to some examples may also be combined in other examples.
In this embodiment, a process for manufacturing permeable plastic road surface layer particles is provided, which comprises the following steps:
adding raw materials into an extruder, heating the raw materials to a molten state by the extruder, extruding the raw materials into a forming cavity with a preset shape of an extrusion body 2 from a machine head body 1 connected with the output end of the extruder, cooling and forming, and then demolding to obtain particles with a preset shape.
Channels which are communicated with the output end of the extruder and the forming cavity with the preset shape are arranged in the machine head body 1 and the extrusion body 2; the material extruded by the extruder can enter the forming cavity of the extrusion body 2 through the channel;
the extrusion body 2 is provided with a fixed die 22 and a movable die 23 which can be separated, and the fixed die 22 and the movable die 23 are provided with die cavities 24 which can be matched with each other to form a molding cavity. The fixed die 22 and the movable die 23 are combined to form a complete forming cavity for injecting materials for forming, and the forming cavity and the movable die are separated from each other for demoulding formed particles.
The predetermined shape may be selected from, but is not limited to: hexahedron, octahedron, sphere with convex surface;
the convex part of the sphere with the convex part on the surface can be selected from but not limited to: cylindrical and conical;
the shape of the forming cavity matches the predetermined shape of the particles.
The effect of the particle shape was tested using the following method:
the examples used regular hexagonal particles, comparative example 1 used crushed particles of indefinite shape obtained by crushing, and comparative example 2 used rectangular particles.
Examples and comparative examples 1, 2 were extruded using EPDM (exxonmobil EPDM Vistalon 1703P) material, except that comparative example 1 was crushed using a crusher to obtain particles, and comparative example 2 was cut by extrusion to obtain rectangular particles;
paving a surface layer on the cement ground subjected to waterproof treatment, wherein the weight ratio of a PU cementing agent (Huachengkao environmental protection type 3602 PU adhesive) to particles is 1:4, fully mixing uniformly, adding a drier CUCAT-PDS, stirring uniformly, and paving and leveling;
after curing for 13 days at normal temperature, carrying out physical property test by referring to the national standard GB/T14833-2011;
the test results are given in the following table:
from the data in the table above, it can be seen that the tensile strength, impact absorption rate and skid resistance of the plastic pavement using the particles of the experimental group are all significantly greater than those of the plastic pavement using the particles of the comparative group, and especially the difference of the skid resistance is significant;
comprehensively, the specific shape of the experimental group particles greatly improves the physical property of the permeable plastic pavement, obviously improves the anti-skid value and is particularly suitable for the permeable plastic pavement of a pedestrian green-road bicycle lane.
As shown in fig. 1 to 7, the apparatus for manufacturing water-permeable plastic road surface course particles comprises:
the front end of the machine head body 1 is connected with the extrusion body 2, and a first channel 11 communicated with the extrusion body 2 is arranged in the machine head body 1;
the extrusion body 2, the extrusion body 2 includes the central body 21 and fixed die 22 and movable die 23 of the periphery of the central body 21, at least more than two fixed dies 22 are fixedly connected with central body 21, the movable die 23 the same as fixed die 22 in number is connected with central body 21 rotatably, there is predetermined interval between two adjacent fixed dies 22, the width of the predetermined interval is greater than the width of the movable die 23;
a die cavity 24 is arranged on the corresponding surface of the fixed die 22 and the movable die 23, the movable die 23 rotates to a first preset position around the central body 21 to be matched with the fixed die 22 on one side, and rotates to a second preset position to be matched with the fixed die 22 on the other side, and the die cavity 24 of the fixed die 22 and the die cavity 24 of the movable die 23 form a molding cavity during matching;
a second channel 25 communicated with the first channel 11 is arranged in the extrusion body 2, and a channel communicated with the die cavity 24 and the second channel 25 is arranged in the fixed die 22 or the movable die 23;
a cleaning mechanism 3 for cleaning and separating the product from the cavity 24 is also arranged between the movable die 23 and the fixed die 22.
The machine head body 1 comprises a rear seat 12, a flow dividing body 14 and a front seat 15 which are sequentially connected from back to front, the rear seat 12 is connected with an outlet of the extruder, the rear end of a first channel 11 extends to the rear end face of the rear seat 12 to form an opening, a porous plate 13 is arranged on the opening, a conical body 141 extending into the first channel 11 is arranged at the rear end of the flow dividing body 14, the flow dividing body 14 divides the first channel 11 into a front first channel 111 and a rear first channel 112, and at least more than two front first channels 111 are communicated with one rear first channel 112 through holes in the flow dividing body 14; the second channel 25 on the extrusion body corresponds to the front first channel 111. The material is extruded from the extruder and reaches the rear first channel 112 through the primary flow distribution buffer of the porous plate 13, then is uniformly distributed into the front first channel 111 through the holes of the flow distribution body 14 by the guide of the conical body 141, and then enters the second channel 25, and the material flow in the second channel 25 is kept average.
The movable mold 23 is connected with a power source required for rotation, and the power source can be selected from but not limited to: the hydraulic cylinder is connected with the hydraulic motor;
the rotary connection of the movable die 23 to the central body 21 is optional but not limited to: the movable die 23 is connected with an annular sliding groove on the central body 21 through a sliding block, the movable die 23 is connected with a rotating body 26 sleeved on the central body 21, and the rotating body 26 is connected with the central body 21 through a bearing or an annular groove.
As shown in fig. 2, the movable mold 23 is a rotating body 26 connected with the central body 21 in a connecting manner, and the rotating body 26 is connected with the central body 21 through a bearing or a ring groove;
based on such a movable connection structure, a corresponding power source is provided, the power source is an electric motor, a gear ring is arranged on the rotating body 26, and the gear ring is meshed with a gear on the electric motor, so that the electric motor drives the rotating body 26 and the movable die 23 to rotate through gear transmission.
In the present embodiment, the difference between the central angle corresponding to the presence of a predetermined gap between the two fixed molds 22 and the central angle corresponding to the movable mold 23 is 8 to 30 °.
The machine head body 1 is also provided with a heater for heating the internal materials. Prevent the material from solidifying in the flow channel.
The fixed mold 22 and the movable mold 23 are provided with coolers for cooling. Of course, it is also possible to cool the installation by placing it under water.
The heater and the cooler can be heated or cooled by introducing a heat medium into the heating flow passage and the cooling flow passage.
As shown in fig. 1 to 4, as an embodiment of the passage provided in the fixed mold 22 to communicate with the cavity 24 and the second passage 25: a third passage 221 for communicating the cavity 24 with the second passage 25 is provided in the fixed mold 22; the material enters the third channel 221 through the second channel 25 and then enters the forming cavity to be formed into particles.
The cleaning mechanism 3 comprises a cleaning shaft 31 and a scraper 32, at least two scrapers 32 are arranged on the cleaning shaft 31, the cleaning shaft 31 is connected with a power source for driving the cleaning shaft 31 to rotate, the scraper 32 corresponds to one surface of the fixed die 22, which is provided with the die cavity 24, when the movable die 23 moves to a first preset position, the cleaning shaft 31 of the cleaning mechanism 3 far away from the movable die 23 rotates to drive the scraper 32 to scrape and separate a product in the die cavity 24 of the fixed die 22, the product can be separated by the shearing force of the scraper 32, or a hairbrush or the like is arranged on the scraper 32, and the product can be separated by the friction force.
The cleaning mechanism 3 may be purged with air.
It should be noted that, since the material enters the molding cavity from the third channel 221 of the fixed mold 22, the molded product is adhered to the material in the third channel 221, so that the product can be in a state of remaining in the molding cavity 24 of the fixed mold 22 when the movable mold 23 is separated from the fixed mold 22.
It should be considered that, since a third channel 221 is necessarily in an open state (the mold cavity 24 communicated with the third channel 221 does not constitute a molding cavity), a valve is disposed on the third channel 221 or the second channel 25 for controlling the opening and closing of the channel to prevent the material from being discharged from the open third channel 221.
As shown in fig. 5 to 7, as an embodiment in which a passage communicating with the cavity 24 and the second passage 25 is provided in the movable mold 23:
two fifth channels 231 which are respectively communicated with the die cavities 24 on the two sides of the movable die 23 are arranged in the movable die 23, and the fifth channels 231 extend to the inner circular surface of the movable die 23;
the central body 21 is also provided with fourth channels 211 communicated with the second channels 25, each movable die 23 corresponds to two fourth channels 211, and the fourth channels 211 extend to the outer circular surface of the central body 21;
the movable die 23 rotates to the first predetermined position around the central body 21, and one fifth passage 231 of the movable die 23 communicates with one of the two corresponding fourth passages 211 of the movable die 23;
the movable die 23 rotates to a second preset position around the central body 21, another fifth channel 231 of the movable die 23 is communicated with another of the two fourth channels 211 corresponding to the movable die 23, so that when the movable die 23 rotates to the first preset position and the second preset position, the movable die 23 can be communicated with the second channel 25 through one fourth channel 211 to obtain a material, the material enters the fourth channel 211 through the second channel 25, then enters the fifth channel 231, and then enters each forming cavity to be formed into particles;
the cleaning mechanism 3 includes:
the gas cavity 33 is arranged in the handpiece body 1, the gas cavity 33 is communicated with a gas source 34, and the gas source 34 provides a compressed gas source with adjustable pressure of 0.01-0.8 MPA;
a first gas passage 35 disposed in the central body 21, the first gas passage 35 communicating with the gas chamber 33;
two third air channels 37 which are arranged in the movable die 23 and are respectively communicated with the die cavities 24 at two sides of the movable die 23, and the third air channels 37 extend to the inner circular surface of the movable die 23;
the movable die 23 rotates to a first preset position around the central body 21, and a third air passage 37 communicated with the die cavity 24 on the side of the movable die 23 far away from the fixed die 22 is communicated with one of two corresponding second air passages 36 of the movable die 23;
the movable die 23 rotates to a second preset position around the central body 21, a third air passage 37 communicated with the die cavity 24 on one side of the movable die 23 far away from the fixed die 22 is communicated with the other of the two second air passages 36 corresponding to the movable die 23, so that when the movable die 23 rotates to the first preset position and the second preset position, the third air passage 37 and the die cavity 24 on the side separated from the fixed die 22 can be communicated through one second air passage 36, and a high-pressure gas is input through the gas source 34 to extrude a product in the forming cavity and separate the product from the movable die 23 through gas pressure.
The air source 34 provides a predetermined air pressure in the third air passage 37 as material is extruded from the fifth passage 231 into the molding cavity. The predetermined air pressure prevents the material from entering the third air passage 37.
It should be considered that, since there must be a fourth channel 211 in an open state, and it is inconvenient to arrange a valve to control the closing of the fourth channel 211 in the open state, the two sides of the movable die 23 are provided with the arc-shaped baffles 232, the baffles 232 are in interference fit with the outer surface of the central body 21, when the movable die 23 rotates to the first predetermined position or the second predetermined position, the baffles 232 of the movable die 23 close the open fourth channel 211 (the fourth channel 211 which is not communicated with the fifth channel 231) to prevent the material from overflowing from the fourth channel 211, the fixed die 22 is provided with the slots which are matched with the baffles 232 and can accommodate the baffles 232, for example, when the movable die 23 rotates to the first predetermined position, one side of the baffle 232 of the movable die 23 closes the open fourth channel 211, and the other side of the baffle 232 is inserted into the slot of the fixed die.
It should be noted that, since the material enters the molding cavity from the fifth passage 231 of the movable mold 23, the molded product is adhered to the material in the fifth passage 231, and therefore, the product can be in a state of remaining in the molding cavity 24 of the fixed mold 22 when the movable mold 23 is separated from the fixed mold 22. In order to avoid that the product sticks to the material in the fifth channel 231 and affects the ejection of the product, a gate of a predetermined length and diameter is connected between the mold cavity 24 and the fifth channel 231. The predetermined length and diameter are required to enable the product to be ejected by high pressure gas, which may stick to the material in a portion of the gate without affecting the use of the product.
As a further arrangement, a heating unit is provided at one side of the fifth passage 231 inside the movable mold 23. The material in the fifth channel 231 is kept in good fluidity by the heating unit during casting.
Claims (9)
1. The manufacturing process of the permeable plastic road surface layer particles is characterized by comprising the following steps:
adding raw materials into an extruder, heating the raw materials to a molten state by the extruder, extruding the raw materials into a molding cavity with a preset shape of an extrusion body from a machine head body connected with the output end of the extruder, and demolding after cooling molding to obtain particles with a preset shape;
the machine head body and the extrusion body are internally provided with channels for communicating the output end of the extruder and a molding cavity with a preset shape;
the extrusion body is provided with a fixed die and a movable die which can be separated, and the fixed die and the movable die are provided with die cavities which can be matched with each other to form a forming cavity;
the predetermined shape is hexahedron or octahedron or a sphere with a convex surface.
2. The process for producing water-permeable plastic road surface course particles as claimed in claim 1, wherein the protrusions of the spherical body provided with the protrusions on the surface are cylindrical or conical.
3. The process for manufacturing the water-permeable plastic road surface layer particles as claimed in claim 1, wherein the front end of the machine head body is connected with the extrusion body, and a first channel communicated with the extrusion body is arranged in the machine head body;
the extrusion body comprises a central body, and a fixed die and a movable die which are arranged on the periphery of the central body, wherein at least more than two fixed dies are fixedly connected with the central body, the movable dies with the same number as the fixed dies are rotatably connected with the central body, a preset gap is formed between every two adjacent fixed dies, and the width of the preset gap is larger than that of the movable dies;
the mould cavity is arranged on the corresponding surface of the fixed mould and the movable mould, the movable mould rotates to a first preset position around the central body to be matched with the fixed mould on one side, rotates to a second preset position to be matched with the fixed mould on the other side, and the mould cavity of the fixed mould and the mould cavity of the movable mould form a forming cavity during matching;
a second channel communicated with the first channel is arranged in the extrusion body, and a channel communicated with the die cavity and the second channel is arranged in the fixed die or the movable die;
a cleaning mechanism for cleaning and separating the particles from the die cavity is also arranged between the movable die and the fixed die.
4. The process for manufacturing water-permeable plastic road surface layer particles as claimed in claim 1, 2 or 3, wherein the machine head body comprises a rear seat, a flow dividing body and a front seat which are sequentially connected from back to front, the rear seat is connected with an outlet of the extruder, the rear end of the first channel extends to the rear end face of the rear seat to form an opening, a porous plate is arranged on the opening, the rear end of the flow dividing body is provided with a conical body which extends into the first channel, the flow dividing body divides the first channel into a front first channel and a rear first channel, and at least more than two front first channels are communicated with one rear first channel through holes on the flow dividing body; the second channel on the extrusion body corresponds to the front first channel.
5. The process for manufacturing water-permeable plastic road surface layer particles as claimed in claim 3, wherein a third channel communicating the mold cavity and the second channel is provided in the fixed mold; the material enters the third channel through the second channel and then enters the forming cavity to be formed into particles.
6. The process for manufacturing water-permeable plastic road surface layer particles as claimed in claim 5, wherein the cleaning mechanism comprises a cleaning shaft and a scraper, the cleaning shaft is provided with at least two scrapers, the cleaning shaft is connected with a power source for driving the cleaning shaft to rotate, the scraper corresponds to one side of the fixed mold provided with the mold cavity, and when the movable mold moves to the first preset position, the cleaning shaft of the cleaning mechanism far away from the movable mold rotates to drive the scraper to scrape and separate particles in the mold cavity of the fixed mold.
7. The process for manufacturing water-permeable plastic road surface course particles as claimed in claim 3, wherein two fifth channels are provided in the movable mold, the fifth channels being respectively communicated with the mold cavities at both sides of the movable mold, the fifth channels extending to the inner circumferential surface of the movable mold;
the central body is also provided with fourth channels communicated with the second channels, each movable die corresponds to two fourth channels, and the fourth channels extend to the outer circular surface of the central body;
the movable die rotates to a first preset position around the central body, and a fifth channel of the movable die is communicated with one of the two corresponding fourth channels of the movable die;
the movable mould rotates to a second preset position around the central body, another fifth channel of the movable mould is communicated with another of the two fourth channels corresponding to the movable mould, so that when the movable mould rotates to the first preset position and the second preset position, the movable mould can be communicated with the second channel through one fourth channel to obtain a material, and the material enters the fourth channel through the second channel, then enters the fifth channel and then enters each forming cavity to be formed into particles.
8. The process of manufacturing water permeable plastic road surface layer particles as claimed in claim 7, wherein the sweeping mechanism comprises:
the gas cavity is arranged in the handpiece body and is communicated with a gas source;
the first air channel is arranged in the central body and is communicated with the air cavity;
the second air channels are communicated with the first air channels, each movable die corresponds to two second air channels, and the second air channels extend to the outer circular surface of the central body;
two third air channels which are arranged in the movable mould and are respectively communicated with the mould cavities at the two sides of the movable mould, and the third air channels extend to the inner circular surface of the movable mould;
the movable mould rotates to a first preset position around the central body, and a third air channel communicated with the mould cavity at one side of the movable mould, which is far away from the fixed mould, is communicated with one of the two second air channels corresponding to the movable mould;
the movable mould rotates to a second preset position around the central body, a third air channel communicated with the mould cavity at one side of the movable mould far away from the fixed mould is communicated with the other one of the two second air channels corresponding to the movable mould, so that when the movable mould rotates to the first preset position and the second preset position, the third air channel can be communicated with the mould cavity at one side separated from the fixed mould through one second air channel, and particles in the forming cavity are extruded out and separated from the movable mould through air pressure by inputting air through an air source.
9. The process for manufacturing water-permeable plastic road surface layer particles as claimed in claim 7, wherein the two sides of the movable mould are provided with arc-shaped baffles, the baffles are attached to the outer surface of the central body, the fourth channel in an open state is closed by the baffles of the movable mould when the movable mould rotates to the first preset position or the second preset position, and the fixed mould is provided with slots matched with the baffles and capable of accommodating the baffles.
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Denomination of invention: Manufacturing process of permeable plastic road surface particles Effective date of registration: 20231017 Granted publication date: 20220225 Pledgee: Bank of Nanjing Co.,Ltd. Huai'an branch Pledgor: Jiangsu Jiajing Ecological Engineering Technology Co.,Ltd. Registration number: Y2023980061450 |