CN117103657A - Heat-shrinkable tube with heat conduction function and diameter expansion method thereof - Google Patents
Heat-shrinkable tube with heat conduction function and diameter expansion method thereof Download PDFInfo
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- CN117103657A CN117103657A CN202311168018.8A CN202311168018A CN117103657A CN 117103657 A CN117103657 A CN 117103657A CN 202311168018 A CN202311168018 A CN 202311168018A CN 117103657 A CN117103657 A CN 117103657A
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- expansion
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000000498 cooling water Substances 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 64
- 238000001816 cooling Methods 0.000 claims description 31
- 230000005855 radiation Effects 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004132 cross linking Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 abstract description 8
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
- B29C55/24—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes radial
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/16—Cooling
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/16—Cooling
- B29C2035/1616—Cooling using liquids
-
- 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
- B29L2023/00—Tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a heat-shrinkable tube expanding method with a heat conduction function, which comprises the following preparation steps: step (1): mixing and granulating, namely weighing various raw materials according to a formula, uniformly stirring by using a high-speed stirrer, and then starting mixing and granulating, wherein the mixing and granulating are completed by a granulator, a cooling water tank, a blow dryer and a granulator. The expanding cavity is of a continuous changing structure, so that the pipe is expanded continuously in the expanding process, the expanded inner diameter of the expanding cavity always tends to change to the required size, and the aim is to solve the problems that the upper half part of the heat shrinkage pipe is easier to expand than the lower half part of the heat shrinkage pipe in the expanding process under the influence of self gravity and the blocking of the inner wall of the expanding cavity, the wall thickness of the lower half part of the heat shrinkage pipe is possibly larger than that of the upper half part of the heat shrinkage pipe, and the wall thicknesses of the left end and the right end of the heat shrinkage pipe are possibly too thin, so that the heat shrinkage pipe is broken.
Description
Technical Field
The invention relates to the technical field of heat-shrinkable tubes, in particular to a heat-shrinkable tube with a heat conduction function and a diameter expanding method thereof.
Background
The heat shrinkage tube is a special polyolefin heat shrinkage sleeve. The outer layer is formed by compounding and processing high-quality soft cross-linked polyolefin materials and inner layer hot melt adhesives, the outer layer has the characteristics of insulation, corrosion resistance, wear resistance and the like, the inner layer has the advantages of low melting point, waterproof sealing, high adhesiveness and the like, the heat shrinkage pipe is required to be discharged through an extruder and forming equipment during production, vulcanized through vulcanizing equipment, and finally expanded and formed by an expander, and is rapidly cooled for shaping after expansion is completed.
The pyrocondensation pipe generally adopts pyrocondensation pipe expansion mould in carrying out the expansion process, current pyrocondensation pipe expansion mould is when expanding, generally going on under vacuum condition, the inside still communicates with the air of pyrocondensation pipe after heating, under the effect of atmospheric pressure, the pipe wall of the pyrocondensation pipe after heating will paste the inside inner wall that expands the chamber of pyrocondensation pipe expansion mould, thereby the pyrocondensation pipe is expanded, but in the in-process of expansion, because the low side is transported along the bottom of the inside expansion intracavity wall of mould in the pyrocondensation pipe transportation, under the influence of pyrocondensation pipe self gravity and the blocking of expansion intracavity wall, the pyrocondensation pipe is more easily expanded at its first half than the latter half of expansion in the expansion process, the second half wall thickness of the thermal condensation pipe is greater than the first half of pyrocondensation pipe probably, and the left and right sides wall thickness of pyrocondensation pipe is too thin, thereby the circumstances of fracture appear.
Therefore, it is necessary to provide a heat shrinkable tube with heat conduction function and a diameter expanding method thereof to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a heat shrinkage tube with a heat conduction function and a diameter expansion method thereof, so as to solve the problems that the upper half part of the heat shrinkage tube is easier to expand than the lower half part in the expansion process under the influence of the gravity of the heat shrinkage tube and the blocking of the inner wall of an expansion cavity in the background technology, the wall thickness of the lower half part of the heat shrinkage tube is possibly larger than that of the upper half part of the heat shrinkage tube, and the wall thickness of the left end and the right end of the heat shrinkage tube is possibly too thin, so that the situation of fracture occurs.
In order to achieve the above purpose, the present invention provides the following technical solutions: a heat shrinkage tube expanding method with heat conduction function comprises the following preparation steps:
step (1): mixing and granulating, namely weighing various raw materials according to a formula, uniformly stirring by using a high-speed stirrer, and then starting mixing and granulating, wherein the mixing and granulating are completed by a granulator, a cooling water tank, a blow dryer and a granulator together;
step (2): extruding and forming, namely putting a product produced by mixing and granulating into an extruder, transporting by double screws arranged in the extruder, extruding and forming under a certain temperature condition, and cooling and forming into a pipe;
step (3): the function of the under-beam transmission device is to continuously send the plastic pipe into and out of the electron accelerator, then the electron accelerator generates rays, the plastic pipe is irradiated to generate crosslinking, and after the winding times are determined, the required radiation dose can be obtained by controlling the beam current of the electron accelerator and the speed of the under-beam transmission device;
step (4): the method comprises the steps of expanding and shaping, namely heating a plastic pipe in a radiation cross-linked state to a high-elastic state, then conveying the pipe in the high-elastic state to the inside of a heat-shrinkable pipe expansion die for expansion, wherein the expansion is divided into three steps, firstly expanding the upper half part of the pipe, keeping the lower half part of the pipe unchanged, then expanding the upper half part of the pipe after the height and the width of the upper half part of the pipe are expanded for a period of time, wherein the expansion degree of the lower half part of the pipe is smaller than that of the upper half part of the pipe until the upper half part and the lower half part of the pipe are expanded to the required height, secondly, completing the expansion of the upper half part and the lower half part of the pipe, and only expanding the two ends of the pipe to the required size until the two ends of the upper half part of the pipe are expanded in the process, thirdly, conveying the pipe continuously after the expansion is completed, and then pre-shaping the pipe is performed through preliminary cooling, and rapidly cooling the pipe after the pipe is separated from the heat-shrinkable pipe expansion die, and in the second step, pre-cooling the upper half part of the pipe is performed through a warm water circulation system until the expansion of the pipe is completed, so that the expansion temperature of the upper half part of the pipe is not cooled down easily, and the expansion is easy to reduce after the expansion is completed.
The heat-shrinkable tube expanding device comprises a heat-shrinkable tube expanding die, wherein an expanding cavity is formed in the heat-shrinkable tube expanding die, and the expanding cavity is formed by three sections of cavities from left to right.
Preferably, the inner diameters of the upper end, the lower end, the left end and the right end of the first section cavity of the expanding cavity are gradually increased, first through holes are formed in the outer wall of the upper end of the first section cavity of the expanding cavity at equal intervals, first vacuum holes of a semicircular structure are communicated with the outer sides of the first through holes, and first suction holes are communicated with the tops of the first vacuum holes.
Preferably, the inner diameters of the upper end, the lower end, the left end and the right end of the second section cavity of the expanding cavity are gradually increased, second through holes are formed in the outer walls of the upper end and the lower end of the second section cavity of the expanding cavity at equal intervals, second vacuum holes of a semicircular structure are communicated with the outer sides of the second through holes, and second suction holes are communicated with the top of the second vacuum holes.
Preferably, the inner diameters of the upper end and the lower end of the third section cavity of the expanding cavity are kept unchanged, the inner diameters of the left end and the right end are gradually increased, third through holes are formed in the outer walls of the upper end and the lower end of the third section cavity of the expanding cavity at equal intervals, third vacuum holes of a semicircular structure are communicated with the outer sides of the third through holes, and third suction holes are communicated with the top of the third vacuum holes.
Preferably, a water source transportation pipe is arranged between the third through holes adjacent to the outer wall of the upper end of the third section cavity, and the inlet and the outlet of the water source transportation pipe penetrate through the top of the heat shrinkage pipe expansion die.
Preferably, one end of the heat shrinkage tube expansion die is connected with a cooling circular plate, a water inlet is formed in one end of the top of the cooling circular plate, a water outlet is formed in the other end of the bottom of the cooling circular plate, and a spiral tube is arranged between the water inlet and the water outlet in a spiral mode.
Preferably, the heat-conducting filler inside the heat-shrinkable tube is at least one selected from aluminum oxide, aluminum nitride, magnesium oxide and graphite.
Compared with the prior art, the invention has the beneficial effects that:
when the pipe expands in the first section cavity, the vacuum pump is connected through the first suction hole, the first section cavity is vacuumized through the first vacuum hole and the first through hole, the pipe wall of the heated pipe is tightly attached to the inner wall of the first section cavity under the action of atmospheric pressure, at the moment, the upper half part of the pipe gradually begins to expand, and the inner diameters of the upper end, the lower end, the left end and the right end of the first section cavity gradually increase along with the gradual increase of the inner diameters of the upper end, the lower half part in the first section cavity is in a sealing state, so that the lower half part of the pipe is not expanded in the expansion process of the upper half part of the pipe, and the two ends of the first section cavity are in an oval structure through the first section cavity, so that the tendency of falling down possibly caused by self gravity after the upper half part of the pipe is expanded can be reduced;
when the pipe expands in the second section cavity, the vacuum pump is connected through the second suction hole, then the second section cavity is sucked into vacuum through the second vacuum hole and the second through hole, and then the pipe wall of the pipe is tightly attached to the inner wall of the second section cavity under the action of atmospheric pressure;
when the pipe expands in the third section cavity, the heights of the upper end and the lower end of the third section cavity are unchanged, the widths of the two ends are only changed, the width of the upper half part of the third section cavity is always larger than that of the lower half part of the third section cavity until the upper half part reaches the required size, then the width of the lower half part catches up with the upper half part to form a complete circular structure, and the pipe expands along with the change of the third section cavity.
In summary, the expanding cavity provided by the invention has a continuous changing structure, so that the pipe is continuously expanded in the expanding process, the expanded inner diameter of the pipe is always changed towards the required size, and the purpose is to solve the problems that the upper half part of the heat shrinkage pipe is easier to expand than the lower half part of the heat shrinkage pipe in the expanding process under the influence of self gravity and the blocking of the inner wall of the expanding cavity, the wall thickness of the lower half part of the heat shrinkage pipe is larger than that of the upper half part of the heat shrinkage pipe, and the wall thickness of the left and right ends of the heat shrinkage pipe is too thin, so that the heat shrinkage pipe is broken;
in summary, the water source transportation pipe can be used for warm water circulation, the expanded pipe is pre-cooled by circulating warm water through the water source transportation pipe, so that the temperature of the upper part of the pipe is reduced after the expansion is completed, the elasticity is reduced, deformation is not easy to occur, cold water is input into the water inlet and transported through the spiral pipe, finally flows out of the water outlet to form a cold water circulation system, then the pipe which is completely expanded is pre-cooled, the pipe can be primarily shaped, and then the pipe which is separated from the cooling circular plate is quickly cooled in the cold water, and the temperature of the pipe is reduced due to pre-cooling work, the influence on the cold water is reduced after the pipe enters the cold water, so that the cooling effect of the cold water is better.
Drawings
FIG. 1 is a schematic diagram showing the front view of a heat shrink tube expansion die in the invention;
FIG. 2 is a schematic side view of the expanding chamber of FIG. 1;
FIG. 3 is a schematic side view of the expanding chamber of FIG. 1;
FIG. 4 is a schematic side view of the expanding chamber of FIG. 1;
FIG. 5 is a schematic side view of the expanding chamber of FIG. 1 at D in accordance with the present invention;
FIG. 6 is a schematic side view of the expanding chamber of FIG. 1;
FIG. 7 is a schematic view of the structure of the spiral pipe of the present invention;
FIG. 8 is a line graph of the expansion chamber height over time in accordance with the present invention;
FIG. 9 is a line graph of the variation of the width of the expanding chamber over time in accordance with the present invention.
In the figure: 1. an expanding cavity; 2. a first through hole; 3. a first vacuum hole; 4. a first suction hole; 5. a second through hole; 6. a second vacuum hole; 7. a second suction hole; 8. a third through hole; 9. a third vacuum hole; 10. a third suction hole; 11. a water source transport pipe; 12. cooling the annular plate; 13. a water inlet; 14. a water outlet; 15. a spiral tube.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.
A heat shrinkage tube expanding method with heat conduction function comprises the following preparation steps:
step (1): mixing and granulating, namely weighing various raw materials according to a formula, uniformly stirring by using a high-speed stirrer, and then starting mixing and granulating, wherein the mixing and granulating are completed by a granulator, a cooling water tank, a blow dryer and a granulator together;
step (2): extruding and forming, namely putting a product produced by mixing and granulating into an extruder, transporting by double screws arranged in the extruder, extruding and forming under a certain temperature condition, and cooling and forming into a pipe;
step (3): the function of the under-beam transmission device is to continuously send the plastic pipe into and out of the electron accelerator, then the electron accelerator generates rays, the plastic pipe is irradiated to generate crosslinking, and after the winding times are determined, the required radiation dose can be obtained by controlling the beam current of the electron accelerator and the speed of the under-beam transmission device;
step (4): the method comprises the steps of expanding and shaping, namely heating a plastic pipe in a radiation cross-linked state to a high-elastic state, then conveying the pipe in the high-elastic state to the inside of a heat-shrinkable pipe expansion die for expansion, wherein the expansion is divided into three steps, firstly expanding the upper half part of the pipe, keeping the lower half part of the pipe unchanged, then expanding the upper half part of the pipe after the height and the width of the upper half part of the pipe are expanded for a period of time, wherein the expansion degree of the lower half part of the pipe is smaller than that of the upper half part of the pipe until the upper half part and the lower half part of the pipe are expanded to the required height, secondly, completing the expansion of the upper half part and the lower half part of the pipe, and only expanding the two ends of the pipe to the required size until the two ends of the upper half part of the pipe are expanded in the process, thirdly, conveying the pipe continuously after the expansion is completed, and then pre-shaping the pipe is performed through preliminary cooling, and rapidly cooling the pipe after the pipe is separated from the heat-shrinkable pipe expansion die, and in the second step, pre-cooling the upper half part of the pipe is performed through a warm water circulation system until the expansion of the pipe is completed, so that the expansion temperature of the upper half part of the pipe is not cooled down easily, and the expansion is easy to reduce after the expansion is completed.
Referring to fig. 1-7, a heat-shrinkable tube expanding device comprises a heat-shrinkable tube expanding die, wherein an expanding cavity 1 is formed in the heat-shrinkable tube expanding die, and the expanding cavity 1 is formed by three sections of cavities from left to right.
As shown in fig. 1-7, the inner diameters of the upper end, the lower end, the left end and the right end of the first section cavity of the expanding cavity 1 are gradually increased, the outer walls of the upper end of the first section cavity of the expanding cavity 1 are equidistantly provided with first through holes 2, the outer sides of the first through holes 2 are communicated with first vacuum holes 3 with semicircular structures, the tops of the first vacuum holes 3 are communicated with first suction holes 4, when the pipe expands in the first section cavity, the pipe is firstly connected with a vacuum pump through the first suction holes 4, then the first section cavity is sucked into vacuum through the first vacuum holes 3 and the first through holes 2, then the pipe wall of the heated pipe is attached to the inner wall of the first section cavity under the action of atmospheric pressure, at the moment, the upper half part of the pipe gradually begins to expand, the inner diameters of the upper half part, the lower half part and the left and right half parts of the first section cavity gradually increase along with the gradual increase of the inner diameters of the upper half part, and the lower half part of the first section cavity form a sealing state, therefore the lower half part of the pipe does not expand in the expansion process of the pipe, and the upper half part of the pipe can drop down due to the gravity of the first section cavity, the upper half part of the pipe can support the pipe can be lowered, and the upper half of the pipe can support the pipe can drop down due to the gravity trend of the upper half of the pipe can support the pipe cavity.
As shown in fig. 1-7, the inner diameters of the upper end, the lower end, the left end and the right end of the second section cavity of the expanding cavity 1 are gradually increased, the outer walls of the upper end, the lower end and the left end of the second section cavity of the expanding cavity 1 are provided with second through holes 5 at equal intervals, the outer sides of the second through holes 5 are communicated with second vacuum holes 6 with semicircular structures, the tops of the second vacuum holes 6 are communicated with second suction holes 7, when the pipe expands in the second section cavity, the pipe is connected with a vacuum pump through the second suction holes 7, then the second section cavity is sucked into vacuum through the second vacuum holes 6 and the second through holes 5, then the pipe wall of the pipe is tightly attached to the inner wall of the second section cavity under the action of atmospheric pressure, and the inner diameters of the upper end, the lower end, the left end and the right end of the pipe are gradually increased, and the expansion degree of the upper half of the second section cavity is larger than that of the lower half.
As shown in fig. 1-7, the inner diameters of the upper and lower ends of the third section cavity of the expanding cavity 1 are kept unchanged, the inner diameters of the left and right ends are gradually increased, the outer walls of the upper and lower ends of the third section cavity of the expanding cavity 1 are equally spaced and provided with third through holes 8, the outer sides of the third through holes 8 are communicated with third vacuum holes 9 with semicircular structures, the tops of the third vacuum holes 9 are communicated with third suction holes 10, when the pipe expands in the third section cavity, the heights of the upper and lower ends of the third section cavity are unchanged, the widths of the two ends are only changed, the width of the upper half part of the third section cavity is always larger than the width of the lower half part until the upper half part reaches the required size, then the width of the lower half part catches up with the upper half part to form a complete circular structure, and the pipe also expands along with the change of the third section cavity.
As shown in fig. 1-7, a water source transportation pipe 11 is arranged between the adjacent third through holes 8 on the outer wall of the upper end of the third section of cavity, the inlet and outlet of the water source transportation pipe 11 penetrate through the top of the heat shrinkage pipe expansion die, the water source transportation pipe 11 can be used for warm water circulation, and the temperature of the expanded pipe is reduced by circulating warm water through the water source transportation pipe 11, so that the temperature of the upper half of the pipe is reduced after expansion is finished, the elasticity is reduced, deformation is not easy to occur, a semicircular ring structure is adopted for the inlet and outlet of the water source transportation pipe 11, and the pipelines of the water source transportation pipes 11 are communicated.
As shown in fig. 1-7, one end of the heat shrinkage tube expansion die is connected with a cooling circular plate 12, one end of the top of the cooling circular plate 12 is provided with a water inlet 13, the other end of the bottom of the cooling circular plate 12 is provided with a water outlet 14, a spiral tube 15 is spirally arranged between the water inlet 13 and the water outlet 14, cold water is input into the water inlet 13 and transported through the spiral tube 15, and finally flows out of the water outlet 14 to form a cold water circulation system, and then the fully expanded pipe is pre-cooled, so that the pipe can be initially shaped, and then the pipe separated from the cooling circular plate 12 quickly enters the cold water for cooling, and the temperature of the pipe is reduced due to pre-cooling work, the influence on the cold water is reduced after entering the cold water, so that the cooling effect of the cold water is better.
The heat conducting filler in the heat shrinking pipe is at least one selected from aluminum oxide, aluminum nitride, magnesium oxide and graphite.
As shown in figures 8-9, in the figure, P1 represents the height of the inner diameter of the upper half part of the pipe to be expanded, P2 represents the height of the inner diameter of the lower half part of the pipe to be expanded, P1 is equal to P2, A1 represents the change condition of the inner diameter of the upper half part of the expanding cavity 1, A2 represents the expansion condition of the inner diameter of the upper half part of the pipe, A1 reaches the point P1 earlier than A2, B1 represents the change condition of the inner diameter of the lower half part of the expanding cavity 1, B2 represents the expansion condition of the inner diameter of the lower half part of the pipe, and the time for B1 and B2 to reach the point P2 is longer than the time for A1, A2 and P3 to represent the width of the inner diameters of the two ends of the expanding cavity 1, C1 represents the change condition of the inner diameters of the two ends of the upper half part of the pipe, and C2 represents the change condition of the inner diameters of the two ends of the lower half part of the pipe.
Working principle: when the heat-shrinkable tube expansion mould is used, firstly, a plastic tube which is subjected to radiation crosslinking is heated to a high-elastic state, then the tube in the high-elastic state is transported to the inside of the heat-shrinkable tube expansion mould for expansion, the expansion is divided into three steps, when the tube is expanded in the first section of cavity, firstly, a vacuum pump is connected through a first suction hole 4, then the inside of the first section of cavity is pumped into vacuum through a first vacuum hole 3 and a first through hole 2, then under the action of atmospheric pressure, the tube wall of the heated tube is tightly attached to the inner wall of the first section of cavity, at the moment, the upper half part of the tube gradually begins to expand, the inner diameters of the upper end, the lower end, the left end and the right end of the first section of cavity gradually increase to be increased, and as the lower half part in the first section of cavity is in a sealed state, the lower half part of the tube is not expanded in the expansion process of the first section of the tube, and the first section of cavity is in an elliptic structure, the two ends of the first section cavity can support the pipe, the tendency that the upper half part of the pipe can drop downwards due to self gravity after being expanded can be reduced, when the pipe expands in the second section cavity, the vacuum pump is connected through the second suction hole 7, then the second section cavity is pumped into vacuum through the second vacuum hole 6 and the second through hole 5, then the pipe wall of the pipe can be tightly attached to the inner wall of the second section cavity under the action of atmospheric pressure, the inner diameters of the upper end, the lower end, the left end and the right end of the second section cavity are gradually increased, the inner diameters of the upper end, the lower end and the left end are also increased, the expansion degree of the upper half part of the second section cavity is larger than that of the lower half part, when the pipe expands in the third section cavity, the height of the upper end and the lower end of the third section cavity is unchanged, and the width of the two ends is only changed, the width of the upper half part of the third section cavity is always larger than that of the lower half part until the upper half part reaches the required size, then the width of the lower half part catches up with the upper half part to form a complete circular structure, the pipe material is expanded along with the change of the third section cavity, the water source conveying pipe 11 can be used for warm water circulation, the expanded pipe material is pre-cooled by circulating warm water through the water source conveying pipe 11, so that the temperature of the upper half part of the pipe material is reduced after the expansion is finished, the elasticity is reduced, deformation is not easy to occur, the inlet and the outlet of the water source conveying pipe 11 are of a semicircular structure, the pipes of the water source conveying pipe 11 are communicated, cold water is conveyed through the spiral pipe 15 after being input into the water inlet 13, finally flows out of the water outlet 14 to form a cold water circulation system, then the pipe material after being fully expanded is pre-cooled, the pipe material can be primarily shaped, then the pipe material which is separated from the cooling circular plate 12 is rapidly cooled inside the cold water, the influence on the cold water is reduced after the pipe material is cooled due to the pre-cooling work, and the effect on the cold water is reduced after the pipe material is cooled inside, and the cold water is cooled better.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A heat shrinkage pipe expanding method with a heat conduction function is characterized by comprising the following steps: the method comprises the following preparation steps:
step (1): mixing and granulating, namely weighing various raw materials according to a formula, uniformly stirring by using a high-speed stirrer, and then starting mixing and granulating, wherein the mixing and granulating are completed by a granulator, a cooling water tank, a blow dryer and a granulator together;
step (2): extruding and forming, namely putting a product produced by mixing and granulating into an extruder, transporting by double screws arranged in the extruder, extruding and forming under a certain temperature condition, and cooling and forming into a pipe;
step (3): the function of the under-beam transmission device is to continuously send the plastic pipe into and out of the electron accelerator, then the electron accelerator generates rays, the plastic pipe is irradiated to generate crosslinking, and after the winding times are determined, the required radiation dose can be obtained by controlling the beam current of the electron accelerator and the speed of the under-beam transmission device;
step (4): the method comprises the steps of expanding and shaping, namely heating a plastic pipe in a radiation cross-linked state to a high-elastic state, then conveying the pipe in the high-elastic state to the inside of a heat-shrinkable pipe expansion die for expansion, wherein the expansion is divided into three steps, firstly expanding the upper half part of the pipe, keeping the lower half part of the pipe unchanged, then expanding the upper half part of the pipe after the height and the width of the upper half part of the pipe are expanded for a period of time, wherein the expansion degree of the lower half part of the pipe is smaller than that of the upper half part of the pipe until the upper half part and the lower half part of the pipe are expanded to the required height, secondly, completing the expansion of the upper half part and the lower half part of the pipe, and only expanding the two ends of the pipe to the required size until the two ends of the upper half part of the pipe are expanded in the process, thirdly, conveying the pipe continuously after the expansion is completed, and then pre-shaping the pipe is performed through preliminary cooling, and rapidly cooling the pipe after the pipe is separated from the heat-shrinkable pipe expansion die, and in the second step, pre-cooling the upper half part of the pipe is performed through a warm water circulation system until the expansion of the pipe is completed, so that the expansion temperature of the upper half part of the pipe is not cooled down easily, and the expansion is easy to reduce after the expansion is completed.
2. The heat-shrinkable tube expanding device applied to the heat-shrinkable tube expanding method with the heat conduction function as claimed in claim 1, comprising a heat-shrinkable tube expanding die, and the heat-shrinkable tube expanding device is characterized in that: the inside of pyrocondensation pipe expansion mould has offered hole enlargement chamber (1), hole enlargement chamber (1) is from left to right by three sections die cavity composition.
3. The heat shrinkable tube expanding apparatus as defined in claim 2, wherein: the inner diameters of the upper end, the lower end, the left end and the right end of the first section cavity of the expanding cavity (1) are gradually increased, first through holes (2) are formed in the outer wall of the upper end of the first section cavity of the expanding cavity (1) at equal intervals, first vacuum holes (3) of a semicircular structure are communicated with the outer side of each first through hole (2), and first suction holes (4) are communicated with the top of each first vacuum hole (3).
4. The heat shrinkable tube expanding apparatus as defined in claim 2, wherein: the inner diameters of the upper end, the lower end, the left end and the right end of the second section cavity of the expanding cavity (1) are gradually increased, second through holes (5) are formed in the outer walls of the upper end and the lower end of the second section cavity of the expanding cavity (1) at equal intervals, second vacuum holes (6) with semicircular structures are communicated with the outer sides of the second through holes (5), and second suction holes (7) are communicated with the top of the second vacuum holes (6).
5. The heat shrinkable tube expanding apparatus as defined in claim 2, wherein: the inner diameters of the upper end and the lower end of the third section cavity of the expanding cavity (1) are kept unchanged, the inner diameters of the left end and the right end are gradually increased, third through holes (8) are formed in the outer walls of the upper end and the lower end of the third section cavity of the expanding cavity (1) at equal intervals, third vacuum holes (9) of a semicircular structure are communicated with the outer sides of the third through holes (8), and third suction holes (10) are communicated with the top of the third vacuum holes (9).
6. The heat shrinkable tube expanding apparatus as defined in claim 5, wherein: a water source transport pipe (11) is arranged between the third through holes (8) adjacent to the outer wall of the upper end of the third section cavity, and the inlet and outlet of the water source transport pipe (11) penetrate through the top of the heat shrinkage pipe expansion die.
7. The heat shrinkable tube expanding apparatus of claim 6, wherein: one end of the heat shrinkage pipe expansion die is connected with a cooling circular plate (12), a water inlet (13) is formed in one end of the top of the cooling circular plate (12), a water outlet (14) is formed in the other end of the bottom of the cooling circular plate (12), and a spiral pipe (15) is arranged between the water inlet (13) and the water outlet (14) in a spiral mode.
8. The heat shrinkage tube with the heat conduction function prepared by the heat shrinkage tube expanding method according to claim 1, wherein the heat shrinkage tube is characterized in that: the heat-conducting filler inside the heat-shrinkable tube is at least one selected from aluminum oxide, aluminum nitride, magnesium oxide and graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311168018.8A CN117103657A (en) | 2023-09-12 | 2023-09-12 | Heat-shrinkable tube with heat conduction function and diameter expansion method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311168018.8A CN117103657A (en) | 2023-09-12 | 2023-09-12 | Heat-shrinkable tube with heat conduction function and diameter expansion method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117103657A true CN117103657A (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311168018.8A Pending CN117103657A (en) | 2023-09-12 | 2023-09-12 | Heat-shrinkable tube with heat conduction function and diameter expansion method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117103657A (en) |
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2023
- 2023-09-12 CN CN202311168018.8A patent/CN117103657A/en active Pending
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