CN116039048A - Production process of crosslinked polyethylene pipe - Google Patents
Production process of crosslinked polyethylene pipe Download PDFInfo
- Publication number
- CN116039048A CN116039048A CN202310171424.3A CN202310171424A CN116039048A CN 116039048 A CN116039048 A CN 116039048A CN 202310171424 A CN202310171424 A CN 202310171424A CN 116039048 A CN116039048 A CN 116039048A
- Authority
- CN
- China
- Prior art keywords
- sizing
- sleeve
- pipe
- variable
- vacuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 38
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000004513 sizing Methods 0.000 claims description 232
- 238000009499 grossing Methods 0.000 claims description 72
- 239000000498 cooling water Substances 0.000 claims description 30
- 230000000670 limiting effect Effects 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 22
- 238000001179 sorption measurement Methods 0.000 claims description 21
- 238000002955 isolation Methods 0.000 claims description 18
- 230000009471 action Effects 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 9
- 238000013459 approach Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000013013 elastic material Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 210000001161 mammalian embryo Anatomy 0.000 description 15
- 230000007704 transition Effects 0.000 description 13
- 238000007493 shaping process Methods 0.000 description 6
- 230000008602 contraction Effects 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
- B29C48/9105—Heating, e.g. for cross linking of hollow articles
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—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
- B29L2023/00—Tubular articles
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention provides a production process of a crosslinked polyethylene pipe, which is applied to the field of plastic processing, and relates to a variable diameter sleeve and an extruder die orifice positioned at the left side of the variable diameter sleeve.
Description
Technical Field
The application relates to the field of plastic processing, in particular to a production process of a crosslinked polyethylene pipe.
Background
The cross-linked polyethylene pipe, called PEX pipe for short, is made of polyethylene material, and changes the linear molecular structure of polyethylene into three-dimensional network structure by means of physical and chemical method, so that the property of polyethylene can be raised, and can be extensively used in various fields.
In the process of forming the crosslinked polyethylene pipe, the temperature is still higher after the crosslinked polyethylene pipe is extruded from the die, and deformation can be generated as a result of dead weight and die-release expansion effect, so that cooling and shaping measures are required to ensure the dimensional and shape precision and good surface quality of the pipe.
In the prior art, a vacuum is pumped between the pipe blank and the sizing sleeve, so that the plastic pipe is tightly stuck to the inner wall of the sizing sleeve under the action of negative pressure to shape, but the cooling and shaping temperature and vacuum pressure of the pipe blank are constant in the shaping process, the adaptability to the temperature of the pipe blank is avoided, the outer wall of the pipe blank which initially enters the sizing sleeve is influenced by temperature difference and pressure to generate deformation nodules, and the shaping effect and the shaping quality of the pipe blank of the subsequent sizing sleeve are directly influenced.
Disclosure of Invention
The application aims at improving the temperature adaptability of cooling and shaping the pipe blank in the production process of the crosslinked polyethylene pipe, so as to avoid the occurrence of nodules on the outer wall of the pipe blank, and compared with the prior art, the production process of the crosslinked polyethylene pipe relates to a variable diameter sleeve and an extruder die opening positioned on the left side of the variable diameter sleeve, and specifically comprises the following steps:
s1, pre-cooling is carried out,
the two ends of the vacuum sizing sleeve in the variable diameter sleeve are simultaneously introduced with the equivalent circulating cooling water, so that the variable diameter sleeve is integrally cooled, the variable traction strip in the variable sleeve is kept in the maximum cold elongation state under the cooling effect of the cooling water, and one side of the flexible smoothing sleeve, which is close to the die opening of the extruder, is flared;
s2, cooling the steel plate in a step manner,
after the flexible smoothing sleeve is expanded, controlling the circulation quantity of cooling water entering one end of the vacuum sizing sleeve close to the die orifice of the extruder to be reduced, and forming a stepped growth state with the circulation quantity of cooling water at the other end of the vacuum sizing sleeve;
s3, vacuumizing the container to obtain a vacuum,
after the cooling step is formed, vacuumizing a vacuum sizing cavity of a vacuum sizing sleeve in the variable sizing sleeve, so that a sizing core pipe positioned in the vacuum sizing cavity can be exhausted outwards through a vacuum adsorption hole, and a vacuum adsorption effect is formed on a pipe blank extruded by a die orifice of the extruder;
s4, sizing and guiding the steel wire,
the extrusion machine extrudes the pipe billet from the die opening, along with the continuous movement of the pipe billet towards the variable sizing sleeve, the heat of the pipe billet can generate heat radiation to the flexible smoothing sleeve extending to the outer side of the variable sizing sleeve, and further in the heat transfer process, the variable traction strip generates heat shrinkage deformation, and further the flexible smoothing sleeve is subjected to necking deformation, so that the flexible smoothing sleeve gradually approaches to the outer end of the pipe billet, along with the continuous approach of the pipe billet, the heat is continuously transferred, the flexible smoothing sleeve is continuously attached to the wall surface of the pipe billet under the heat shrinkage action of the variable traction strip, and the flexible smoothing sleeve positioned in the variable embedding sleeve is used for sizing and guiding the pipe billet;
s5, sizing by temperature change,
along with the continuous entering of the pipe blank, sizing and guiding are continuously carried out on the wall surface of the pipe blank which enters in the follow-up process at the flexible smoothing sleeve, then the pipe blank which enters into the sizing core pipe is continuously cooled under the action of step cooling, and the pipe blank is continuously sized under the action of vacuum adsorption until the pipe blank is discharged from the variable sizing sleeve, so that the temperature-variable diameter-fixing process is completed.
Further, the variable diameter sleeve comprises a pair of sizing bottom plates, a vacuum sizing sleeve fixed between the two sizing bottom plates and a sizing core pipe fixed between the two sizing bottom plates, the vacuum sizing sleeve is sleeved outside the sizing core pipe, the left end of the sizing core pipe is embedded with a variable embedded cylinder sleeve, the left end of the variable embedded cylinder sleeve extends to the outer side of the sizing bottom plate positioned at the left side, the right inner wall of the variable embedded cylinder sleeve is fixedly connected with a flexible smoothing sleeve, the left end of the flexible smoothing sleeve extends to the outer side of the variable embedded cylinder sleeve, and the outer end of the flexible smoothing sleeve is fixedly connected with a plurality of variable traction strips uniformly distributed along the circumferential direction of the flexible smoothing sleeve;
a temperature sensing cavity is formed in the variable traction bar, a temperature sensing deformation bar is fixedly connected between the left inner wall and the right inner wall of the temperature sensing cavity, the left end of the variable embedded cylinder sleeve is rotationally connected with a plurality of guide double-ball bars corresponding to the variable traction bar, and the left end of the guide double-ball bars is rotationally connected with the left end of the variable traction bar.
Further, the temperature-sensing deformation strip is made of multi-section memory metal wires and is in a thermal contraction cold elongation deformation state.
Further, the specific process of sizing and guiding in the step S4 is as follows:
s41, approaching through heat induction, and primarily guiding the pipe blank by the flexible smoothing sleeve which is expanded in a horn shape before the pipe blank is extruded from the die opening to be continuously close to the flexible smoothing sleeve;
the heat transfer of the pipe blank can act on the temperature-sensing deformation strip through the variable traction strip, so that the temperature-sensing deformation strip generates first thermal contraction deformation, and the flexible smoothing sleeve is gradually driven to generate deformation close to the outer end of the pipe blank under the limitation of the guide double-club;
s42, deformation lamination, namely after the pipe blank is guided by the flexible smoothing sleeve to continuously advance, heat accumulation can continuously act, so that the temperature-sensing deformation strip generates second thermal contraction deformation, the flexible smoothing sleeve is driven to continuously generate deformation close to the outer end of the pipe blank under the limitation of the guide double-ball rod, and a lamination state is formed between the flexible smoothing sleeve and the outer end of the pipe blank;
s43, sizing guiding, namely after continuous extrusion of the pipe blank, continuously forming a fitting state by the flexible smoothing sleeve under the limitation of the temperature-sensing deformation strip due to the stability of heat transfer and the deformation of the temperature-sensing deformation strip, so as to realize continuous sizing guiding of the pipe blank.
Further, the temperature sensing cavity inner wall fixedly connected with a plurality of spacing snap rings, and spacing draw-in groove that cooperates with variable traction strip is seted up to spacing snap ring inner wall.
Further, the limiting snap ring is made of flexible materials, and the limiting snap ring deforms along the radial direction of the limiting snap ring.
Optionally, the flexible sizing sleeve inner wall fixedly connected with auxiliary sizing sleeve, auxiliary sizing sleeve adopts elastic material to make, and it is the arc bending state of high side by side under the state of no atress.
Further, the vacuum sizing cavity is formed in the vacuum sizing pipe sleeve, the left end and the right end of the outer end of the vacuum sizing pipe sleeve are fixedly connected with a pair of cooling water pipes communicated with the vacuum sizing cavity, the two cooling water pipes at the same end are respectively located on the upper side and the lower side of the vacuum sizing pipe sleeve, and the cooling water pipes can cool pipe blanks in the sizing process, so that the maintainability of sizing effect is effectively ensured.
Further, sizing core pipe outer end fixedly connected with a pair of division board, and two division boards are located left and right sides end condenser tube directness, and cut apart vacuum sizing chamber, make the vacuum sizing chamber that is located two division boards and keep away from one end mutually be the cooling water circulation district, the division board can be divided into regions with vacuum sizing chamber, the separation in cooling water circulation district and vacuum pumping district, not only the variable sizing cover sizing effect of guaranteeing, reduced its structure complexity, can also realize the regulation and control to the different cooling efficiency in cooling water circulation district, the effect of variable cooling of variable sizing cover has been realized, when guaranteeing variable sizing cover sizing cooling retention effect to the embryo, the quality influence of reduction difference in temperature is to the embryo, further improved crosslinked polyethylene pipe's production quality and suitability.
Further, a plurality of vacuum adsorption holes are formed in the outer end of the sizing core tube, the vacuum adsorption holes are distributed between the two isolation plates, the lower end of the vacuum sizing tube sleeve is fixedly connected with an exhaust tube communicated with the vacuum sizing cavity, the exhaust tube is located between the two isolation plates, the vacuum sizing cavity located between the two isolation plates is a vacuum pumping area, the sizing core tube is acted on through the vacuum adsorption holes, the vacuum sizing strength of the sizing core tube is controlled, the vacuum adsorption holes and the isolation plates are matched, the vacuum degree can be formed between the sizing core tube and the outer end of a tube blank, the sizing effect of the sizing core tube on the tube blank is effectively guaranteed, the sizing quality of the outer end face of the tube blank is improved, and the circumference precision of the outer wall of the crosslinked polyethylene tube is improved.
Compared with the prior art, the advantage of this application lies in:
(1) Through the cooperation of variable diameter sleeve, variable embedded cylinder sleeve, flexible smooth cover, variable traction strip and sizing guide step, can effectively realize forming the transition of cooling and sizing between variable diameter sleeve and the pipe embryo, realize the variability of variable diameter sleeve sizing parameter, make it have not only the transition of temperature, still have the transition guide of sizing size, and then effectively avoid the pipe embryo to make its outer wall produce deformation knot because of difference in temperature and diameter when just getting into variable diameter sleeve, effectively improved the design effect and the design precision of pipe embryo, improved the precision and the surface quality of cross-linked polyethylene pipe's size and shape, improved the production quality of cross-linked polyethylene pipe.
(2) The temperature sensing deformation strip is influenced by temperature to deform, the control of the left side shape of the flexible smoothing sleeve can be realized under the limit of the guide double-ball rod, and then the adaptive sizing guide of the variable sizing sleeve to the pipe blank is realized, so that the sizing quality of the pipe blank can be improved through transition, the probability of cold nodules at the outer end of the pipe blank can be reduced, the production quality of the crosslinked polyethylene pipe is ensured, and the development of the applicability of the crosslinked polyethylene pipe is promoted.
(3) Through the setting of multistage formula memory wire, can be when the pipe embryo gets into in the variable diameter cover just, carry out the approach sizing transition to the pipe embryo, not only realized variable diameter cover variability, can also avoid the pipe embryo head to cause deformation damage, when reducing crosslinked polyethylene pipe head loss, still reduced the sizing degree of difficulty of variable diameter cover, improved the flow that the pipe embryo advanced in variable diameter cover, and then effectively improved sizing efficiency, shortened crosslinked polyethylene pipe's production duration.
(4) Through the cooperation of flexible smooth cover, direction pair club and temperature sensing deformation strip, can be when the pipe embryo gets into in the variable fixed diameter cover just, reduce its resistance, difference in temperature and the footpath difference that gets into in the variable fixed diameter cover, avoid the outer terminal surface of pipe embryo to appear cold knot, improve the quality of pipe embryo head to can also carry out the sizing guide of laminating formula to follow-up pipe embryo in the continuous sizing in-process of pipe embryo, play the function of transition guide, guaranteed the sizing quality of pipe embryo.
(5) The limiting snap ring can limit the position of the variable traction strip in the variable embedded cylinder sleeve, so that the limiting linkage of the variable traction strip to the flexible smoothing sleeve is ensured, the dislocation deformation of the flexible smoothing sleeve can be avoided, and the circumferential precision of sizing of the pipe blank is kept.
(6) The deformation of the limiting snap ring along the radial direction can limit the temperature-sensing deformation position of the variable traction strip, so that transition deformation is avoided, the damage to the pipe blank caused by deformation is reduced, and the operation safety of the pipe blank is ensured.
(7) The auxiliary sizing sleeve not only can cooperate with the flexible smoothing sleeve to perform sizing work on the pipe blank and improve the surface quality of the outer end face of the pipe blank, but also can limit and guide the temperature-sensing deformation of the variable traction strip through the elastic deformation of the auxiliary sizing sleeve, so that the transitional effectiveness of the variable traction strip is ensured, and the end face damage of the pipe blank caused by the transitional shrinkage of the variable traction strip is avoided.
Drawings
FIG. 1 is a flow chart of the production process of the present application;
FIG. 2 is a flow chart of a sizing guidance process of the present application;
FIG. 3 is a sizing guide process state diagram of the present application;
FIG. 4 is a front cross-sectional view of the variable sizing sleeve sizing process of the present application;
FIG. 5 is an isometric view of a variable diameter sleeve of the present application;
FIG. 6 is a cross-sectional view of a variable diameter sleeve of the present application;
FIG. 7 is an exploded view of the variable sizing sleeve of the present application;
FIG. 8 is a cross-sectional view of a variable sleeve of the present application;
FIG. 9 is a cross-sectional view of a variable traction bar of the present application;
FIG. 10 is an exploded view of the variable traction bar of the present application;
fig. 11 is a schematic diagram of the temperature-sensing deformation guide of the temperature-sensing deformation strip.
The reference numerals in the figures illustrate:
the sizing sleeve comprises a variable diameter sleeve, a sizing bottom plate 11, a vacuum sizing sleeve 12, a vacuum sizing cavity 1201, a sizing core tube 13, a vacuum adsorption hole 1301, a separation plate 14, a variable sleeve 2, a flexible leveling sleeve 3, a guide double-club 4, an auxiliary sizing sleeve 5, a variable traction bar 6, a temperature sensing cavity 601, a temperature sensing deformation bar 602 and a limiting snap ring 7.
Detailed Description
The embodiments will be described in detail and throughout the specification with reference to the drawings, wherein, based on the embodiments in the application, all other embodiments obtained by persons skilled in the art without making creative efforts are within the scope of protection of the application.
Example 1:
the invention provides a production process of a crosslinked polyethylene pipe, referring to fig. 1-11, the production process relates to a variable sizing sleeve 1 and an extruder die orifice positioned at the left side of the variable sizing sleeve 1, and specifically comprises the following steps:
s1, pre-cooling is carried out,
the two ends of the vacuum sizing sleeve 12 in the variable diameter sleeve 1 are simultaneously introduced with the same amount of circulating cooling water, so that the variable diameter sleeve 1 is integrally cooled, the variable traction strip 6 in the variable sleeve 2 is kept in the maximum cold elongation state under the cooling effect of the cooling water, and the flexible smoothing sleeve 3 is expanded in a horn shape at one side close to the die opening of the extruder;
s2, cooling the steel plate in a step manner,
after the flexible smoothing sleeve 3 is expanded, the circulation quantity of cooling water entering one end of the vacuum sizing sleeve 12 close to the die orifice of the extruder is controlled to be reduced, and a stepped growth state is formed between the circulation quantity of cooling water entering the other end of the vacuum sizing sleeve 12 and the circulation quantity of cooling water entering the other end of the vacuum sizing sleeve;
s3, vacuumizing the container to obtain a vacuum,
after the cooling step is formed, vacuumizing a vacuum sizing cavity 1201 of a vacuum sizing sleeve 12 in the variable sizing sleeve 1, so that a sizing core pipe 13 positioned in the vacuum sizing cavity 1201 can be exhausted outwards through a vacuum adsorption hole 1301 to form a vacuum adsorption effect on a billet extruded from a die orifice of an extruder;
s4, sizing and guiding the steel wire,
the extruder extrudes the pipe billet from the die opening, along with the continuous movement of the pipe billet towards the inside of the variable sizing sleeve 1, the heat of the pipe billet can generate heat radiation to the flexible smoothing sleeve 3 extending to the outer side of the variable sizing sleeve 1, and then in the heat transfer process, the variable traction strip 6 generates heat shrinkage deformation, and further the flexible smoothing sleeve 3 is subjected to necking deformation, so that the flexible smoothing sleeve 3 gradually approaches the outer end of the pipe billet, along with the continuous approach of the pipe billet, the heat is continuously transferred, the flexible smoothing sleeve 3 is continuously attached to the wall surface of the pipe billet under the heat shrinkage action of the variable traction strip 6, and the flexible smoothing sleeve 3 positioned in the variable embedding sleeve 2 is subjected to sizing guide;
s5, sizing by temperature change,
with the continuous entering of the pipe blank, the flexible smoothing sleeve 3 continuously carries out sizing guide on the wall surface of the pipe blank which enters the sizing core pipe 13, then the pipe blank is continuously cooled under the action of step cooling, the pipe blank is continuously sized under the action of vacuum adsorption until the pipe blank is discharged from the variable sizing sleeve 1, the temperature-variable sizing process is completed, the cooling and sizing transition between the variable sizing sleeve 1 and the pipe blank can be effectively realized through the matching of the variable sizing sleeve 1, the variable embedding sleeve 2, the flexible smoothing sleeve 3, the variable traction strip 6 and the sizing guide step, the variable sizing parameters of the variable sizing sleeve 1 are changed, the variable sizing sleeve 1 has temperature transition and sizing transition guide, the pipe blank is further effectively prevented from generating deformed nodules on the outer wall of the pipe blank due to temperature difference and diameter difference when the pipe blank enters the variable sizing sleeve 1, the sizing effect and sizing precision of the pipe blank are effectively improved, and the sizing effect and the surface quality of the crosslinked polyethylene pipe are improved.
Referring to fig. 3-11, the variable diameter sleeve 1 comprises a pair of sizing bottom plates 11, a vacuum sizing sleeve 12 fixed between the two sizing bottom plates 11 and a sizing core tube 13 fixed between the two sizing bottom plates 11, the vacuum sizing sleeve 12 is sleeved outside the sizing core tube 13, the left end of the sizing core tube 13 is embedded with a variable sleeve 2, the left end of the variable sleeve 2 extends to the outside of the sizing bottom plates 11 positioned at the left side, the distance of the outside of the sizing bottom plates 11 at the extending position of the variable sleeve 2 is 0.1-0.2 times of the total length of the variable sleeve 2, the right inner wall of the variable sleeve 2 is fixedly connected with a flexible smoothing sleeve 3, the left end of the flexible smoothing sleeve 3 extends to the outside of the variable sleeve 2, the distance of the flexible smoothing sleeve 3 extends to the outside of the variable sleeve 2 is 0.2-0.4 times of the total length of the variable traction strips 6 uniformly distributed along the circumferential direction of the flexible smoothing sleeve 3;
the temperature sensing cavity 601 is formed in the variable traction strip 6, the temperature sensing deformation strip 602 is fixedly connected between the left inner wall and the right inner wall of the temperature sensing cavity 601, the left end of the variable embedded cylinder sleeve 2 is rotationally connected with a plurality of guide double-ball rods 4 corresponding to the variable traction strip 6, the left end of the guide double-ball rods 4 is rotationally connected with the left end of the variable traction strip 6, the temperature sensing deformation strip 602 deforms under the influence of temperature, the control of the left side shape of the flexible smoothing sleeve 3 can be realized under the limit of the guide double-ball rods 4, the adaptive sizing guide of the variable sizing sleeve 1 to a pipe blank is further realized, the sizing quality of the pipe blank can be improved through transition, the probability of cold nodules at the outer end of the pipe blank can be reduced, the production quality of a crosslinked polyethylene pipe is guaranteed, and the development of the applicability of the crosslinked polyethylene pipe is promoted.
Referring to fig. 3-11, the inner wall of the temperature sensing cavity 601 is fixedly connected with a plurality of limiting snap rings 7, limiting clamping grooves matched with the variable traction strips 6 are formed in the inner wall of the limiting snap rings 7, the limiting snap rings 7 can limit the positions of the variable traction strips 6 in the variable embedded cylinder sleeve 2, limiting linkage of the variable traction strips 6 to the flexible leveling sleeve 3 is guaranteed, dislocation deformation of the flexible leveling sleeve 3 can be avoided, and circumferential precision of sizing of a pipe blank is kept. Referring to fig. 3-11, the limiting snap ring 7 is made of flexible material, and the limiting snap ring 7 deforms along the radial direction, so that the deformation of the limiting snap ring 7 along the radial direction can limit the temperature-sensing deformation position of the variable traction bar 6, avoid transition deformation, reduce damage to the pipe blank caused by deformation, and ensure the operation safety of the variable traction bar.
Referring to fig. 3-11, when the temperature-sensing deformation bar 602 generates thermal contraction deformation, the temperature-sensing deformation bar 602 drives the left end of the variable traction bar 6 to generate radial deformation close to the center of a circle under the limitation of the guide double-club 4, drives the flexible smoothing sleeve 3 to generate necking deformation, and when the left side of the variable traction bar 6 generates deformation, the limiting snap rings 7 synchronously generate radial stretching deformation, the stretching amounts of the radial stretching deformation generated by the plurality of limiting snap rings 7 from left to right are gradually reduced, the radial deformation and the limiting clamping grooves further limit the deformation direction of the variable traction bar 6 and the deformation amount of the flexible smoothing sleeve 3, so that deformation deflection of the variable traction bar 6 is avoided, and the circumferential precision of the deformed flexible smoothing sleeve 3 is ensured; when the temperature-sensing deformation strip 602 is subjected to cold and generates cold elongation recovery deformation, the temperature-sensing deformation strip 602 can drive the left end of the variable traction strip 6 to generate radial deformation towards the direction away from the center of a circle under the limit of the guide double-club 4, the flexible smoothing sleeve 3 is driven to generate horn-shaped expansion deformation, and when the left side of the variable traction strip 6 is deformed, the limiting snap rings 7 positioned near the left side of the variable traction strip 6 synchronously generate radial shrinkage deformation, the shrinkage of the radial shrinkage deformation generated by the plurality of limiting snap rings 7 from left to right is gradually reduced, the radial deformation and the limiting clamping grooves of the limiting snap rings further limit the deformation direction of the variable traction strip 6 and the deformation of the flexible smoothing sleeve 3, so that the variable traction strip 6 is prevented from generating deformation deviation, and the circumferential precision of the deformed flexible smoothing sleeve 3 is ensured.
Referring to fig. 4-7, a vacuum sizing cavity 1201 is formed in the vacuum sizing sleeve 12, a pair of cooling water pipes communicated with the vacuum sizing cavity 1201 are fixedly connected to the left end and the right end of the outer end of the vacuum sizing sleeve 12, and two cooling water pipes located at the same end are respectively located on the upper side and the lower side of the vacuum sizing sleeve 12, and the cooling water pipes can cool a pipe blank in the sizing process, so that the maintainability of sizing effect is effectively ensured.
Referring to fig. 4-7, the outer end of the sizing core tube 13 is fixedly connected with a pair of isolation plates 14, and the two isolation plates 14 are located at the left end and the right end of the cooling water pipe directly and divide the vacuum sizing cavity 1201, so that the vacuum sizing cavity 1201 at the end, far away from the two isolation plates 14, is a cooling water circulation area, the isolation plates 14 can divide the vacuum sizing cavity 1201, the cooling water circulation area and the vacuum pumping area are separated, the sizing effect of the variable sizing sleeve 1 is ensured, the structural complexity of the variable sizing sleeve is reduced, the regulation and control of different cooling efficiencies of the cooling water circulation area can be realized, the variable cooling effect of the variable sizing sleeve 1 is realized, the quality influence of temperature difference on a pipe blank is reduced while the sizing cooling maintaining effect of the variable sizing sleeve 1 on the pipe blank is ensured, and the production quality and the applicability of the crosslinked polyethylene pipe are further improved.
Referring to fig. 4-7, a plurality of vacuum adsorption holes 1301 are formed in the outer end of the sizing core tube 13, the vacuum adsorption holes 1301 are distributed between two isolation plates 14, an exhaust pipe communicated with a vacuum sizing cavity 1201 is fixedly connected to the lower end of a vacuum sizing sleeve 12, and the exhaust pipe is located between the two isolation plates 14, so that the vacuum sizing cavity 1201 between the two isolation plates 14 is a vacuum pumping area, the vacuum adsorption holes 1301 act on the sizing core tube 13 to control the vacuum sizing strength of the sizing core tube 13, and the vacuum adsorption holes 1301 and the isolation plates 14 cooperate to form a vacuum degree between the sizing core tube 13 and the outer end of a pipe blank, thereby effectively ensuring the sizing effect of the sizing core tube 13 on the pipe blank, improving the sizing quality of the outer end face of the pipe blank and improving the circumference precision of the outer wall of the crosslinked polyethylene pipe.
Example 2:
the present invention provides a process for producing a crosslinked polyethylene pipe, wherein the same or corresponding parts as those in example 1 are denoted by the same reference numerals as those in example 1, and only the differences from example 1 are described below for the sake of brevity. This embodiment 2 is different from embodiment 1 in that: referring to fig. 1-11, the temperature-sensing deformation strip 602 is made of a multi-section memory wire, the number of sections of the memory wire can be selected according to actual needs, the number of sections of the memory wire is limited to be not less than two sections, the deformation trigger temperature of each section of the memory wire can be increased or decreased stepwise, the memory wire is in a thermal contraction cold elongation deformation state, when a pipe blank initially enters the variable diameter sleeve 1, the pipe blank can undergo approach sizing transition, so that the variability of the variable diameter sleeve 1 can be realized, deformation damage of the head of the pipe blank can be avoided, the sizing difficulty of the variable sizing sleeve 1 is reduced while the pipe head loss of the crosslinked polyethylene pipe is reduced, the advancing flow degree of the pipe blank in the variable sizing sleeve 1 is improved, the efficiency is effectively improved, and the production time of the crosslinked polyethylene pipe is shortened.
Referring to fig. 3-11, when the temperature-sensing deformation bar 602 is cooled to generate elongation deformation, it generates an pushing force to the left end of the variable traction bar 6, and the pushing force is converted into a deflection force due to the rotation limitation of the guiding double-ball rod 4, so that the temperature-sensing deformation bar 602 drives the flexible smoothing sleeve 3 to generate trumpet-shaped expansion deformation by controlling the variable traction bar 6; when the temperature-sensing deformation strip 602 is heated to generate shrinkage deformation, a pulling force is generated on the left end of the variable traction strip 6, and the pulling force is converted into a deflection force due to the rotation limitation of the guide double-ball rod 4, so that the temperature-sensing deformation strip 602 controls the flexible smoothing sleeve 3 to generate necking deformation through the variable traction strip 6.
Referring to fig. 1 to 11, the specific process of sizing guidance in step S4 is as follows:
s41, approaching through heat induction, and primarily guiding the pipe blank by the flexible smoothing sleeve 3 which is expanded in a horn shape originally when the pipe blank is extruded from a die opening and is continuously close to the flexible smoothing sleeve 3;
the heat transfer of the pipe blank acts on the temperature-sensing deformation strip 602 through the variable traction strip 6, so that the temperature-sensing deformation strip 602 generates first heat shrinkage deformation, and the flexible smoothing sleeve 3 is gradually driven to generate deformation close to the outer end of the pipe blank under the limitation of the guide double-ball rod 4;
s42, deformation lamination, namely after the pipe blank is guided by the flexible smoothing sleeve 3 to continuously advance, heat accumulation can continuously act, so that the temperature-sensing deformation strip 602 generates second heat shrinkage deformation, the flexible smoothing sleeve 3 is driven to continuously generate deformation close to the outer end of the pipe blank under the limitation of the guide double-ball rod 4, and a lamination state is formed between the flexible smoothing sleeve and the outer end of the pipe blank;
s43, sizing guiding, after continuous extrusion of the pipe billet, due to stability of heat transfer and deformation of the temperature-sensing deformation strip 602, the flexible smoothing sleeve 3 continuously forms a fitting state under the limitation of the temperature-sensing deformation strip 602, and further continuous sizing guiding of the pipe billet is achieved, the flexible smoothing sleeve 3, the guide double-ball rod 4 and the temperature-sensing deformation strip 602 are matched, the pipe billet can be guided in a approaching manner when initially entering the variable diameter sleeve 1, resistance, temperature difference and diameter difference of the pipe billet entering the variable diameter sleeve 1 are reduced, cold nodules are prevented from occurring on the outer end face of the pipe billet, the quality of the head of the pipe billet is improved, and the subsequent pipe billet can be guided in a fitting manner during continuous sizing of the pipe billet, so that the sizing quality of the pipe billet is guaranteed.
Example 3:
the present invention provides a process for producing a crosslinked polyethylene pipe, wherein the same or corresponding parts as those in example 1 are denoted by the same reference numerals as those in example 1, and only the differences from example 1 are described below for the sake of brevity. This embodiment 3 is different from embodiment 1 in that: referring to fig. 1-11, an auxiliary sizing sleeve 5 is fixedly connected to the inner wall of the flexible leveling sleeve 3, the auxiliary sizing sleeve 5 is made of an elastic material and is in an arc bending state with high left and low right in an unstressed state, the auxiliary sizing sleeve 5 not only can be matched with the flexible leveling sleeve 3 to perform sizing work on a pipe blank, the surface quality of the outer end face of the pipe blank is improved, but also can limit and guide the temperature sensing deformation of the variable traction strip 6 through the elastic deformation of the pipe blank, the transitional effectiveness of the variable traction strip 6 is ensured, and the end face damage caused by transitional shrinkage of the variable traction strip 6 on the pipe blank is avoided.
Referring to fig. 1-11, in the use process of the variable diameter sleeve 1, when the temperature-sensing deformation strip 602 is cooled to generate elongation deformation, the elastic state of the auxiliary sizing sleeve 5 assists the temperature-sensing deformation strip 602 to drive the flexible smoothing sleeve 3 to generate trumpet-shaped expansion deformation, deformation of the flexible smoothing sleeve 3 can be maintained in an auxiliary manner, and the guiding caliber of the flexible smoothing sleeve 3 is ensured; when the temperature-sensing deformation strip 602 is heated to generate shrinkage deformation, the elastic state of the auxiliary sizing sleeve 5 can be counteracted under the condition that the shrinkage pulling force of the temperature-sensing deformation strip 602 is continuously increased, deformation accompanied with the flexible flattening sleeve 3 is generated, and under the elastic recovery resistance of the auxiliary sizing sleeve 5 and the deformation limiting effect of the limiting snap ring 7 on the variable traction strip 6, the continuous shrinkage of the flexible flattening sleeve 3 is avoided, the continuous effect on the pipe blank is kept, the laminating sizing of the flexible flattening sleeve 3 is kept, and the sizing quality of the pipe blank is ensured.
The foregoing is merely a preferred embodiment of the present application, which is used in connection with the actual requirement, but the scope of the present application is not limited thereto.
Claims (10)
1. The production process of the crosslinked polyethylene pipe is characterized by involving a variable sizing sleeve (1) and an extruder die orifice positioned at the left side of the variable sizing sleeve (1), and specifically comprising the following steps of:
s1, pre-cooling is carried out,
the variable sizing sleeve (1) is integrally cooled by simultaneously introducing equal amount of circulating cooling water into two ends of a vacuum sizing sleeve (12) in the variable sizing sleeve (1), so that a variable traction strip (6) in the variable embedding sleeve (2) maintains a maximum cold elongation state under the cooling effect of the cooling water, and one side of a flexible smoothing sleeve (3) close to a die opening of an extruder is flared;
s2, cooling the steel plate in a step manner,
after the flexible smoothing sleeve (3) is expanded, controlling the circulation quantity of cooling water entering one end of the vacuum sizing sleeve (12) close to the die orifice of the extruder to be reduced, and forming a stepped growth state with the circulation quantity of cooling water at the other end of the vacuum sizing sleeve (12);
s3, vacuumizing the container to obtain a vacuum,
after the cooling step is formed, a vacuum sizing cavity (1201) of a vacuum sizing sleeve (12) in the variable sizing sleeve (1) is vacuumized, so that a sizing core pipe (13) positioned in the vacuum sizing cavity (1201) can be exhausted outwards through a vacuum adsorption hole (1301) to form a vacuum adsorption effect on a pipe blank extruded by a die orifice of an extruder;
s4, sizing and guiding the steel wire,
the extrusion machine extrudes the pipe billet from the die opening, as the pipe billet moves towards the variable sizing sleeve (1) continuously, heat of the pipe billet can generate heat radiation to the flexible smoothing sleeve (3) extending to the outer side of the variable sizing sleeve (1), and further in the heat transfer process, the variable traction strip (6) generates heat shrinkage deformation, and further the flexible smoothing sleeve (3) is subjected to necking deformation, so that the flexible smoothing sleeve (3) gradually approaches the outer end of the pipe billet, and as the pipe billet approaches continuously, heat is transferred continuously, the flexible smoothing sleeve (3) is attached to the wall surface of the pipe billet continuously under the heat shrinkage effect of the variable traction strip (6), and the flexible smoothing sleeve (3) positioned in the variable embedded cylinder sleeve (2) is used for sizing and guiding the pipe billet;
s5, sizing by temperature change,
along with the continuous entering of the pipe blanks, sizing and guiding are continuously carried out on the wall surfaces of the pipe blanks which enter the flexible smoothing sleeve (3), then the pipe blanks which enter the sizing core pipe (13) are continuously cooled under the action of step cooling, and the pipe blanks are continuously sized under the action of vacuum adsorption until the pipe blanks are discharged from the variable sizing sleeve (1), so that the temperature-variable diameter fixing process is completed.
2. The production process of the crosslinked polyethylene pipe according to claim 1, wherein the variable sizing sleeve (1) comprises a pair of sizing bottom plates (11), a vacuum sizing sleeve (12) fixed between the two sizing bottom plates (11) and a sizing core pipe (13) fixed between the two sizing bottom plates (11), the vacuum sizing sleeve (12) is sleeved outside the sizing core pipe (13), the left end of the sizing core pipe (13) is embedded with a variable embedded cylinder sleeve (2), the left end of the variable embedded cylinder sleeve (2) extends to the outer side of the sizing bottom plate (11) positioned at the left side, the right inner wall of the variable embedded cylinder sleeve (2) is fixedly connected with a flexible smoothing sleeve (3), the left end of the flexible smoothing sleeve (3) extends to the outer side of the variable embedded cylinder sleeve (2), and the outer end of the flexible smoothing sleeve (3) is fixedly connected with a plurality of variable traction strips (6) uniformly distributed along the circumferential direction of the variable embedded cylinder sleeve;
the variable traction bar (6) is internally provided with a temperature sensing cavity (601), a temperature sensing deformation bar (602) is fixedly connected between the left inner wall and the right inner wall of the temperature sensing cavity (601), the left end of the variable embedded cylinder sleeve (2) is rotationally connected with a plurality of guide double-ball bars (4) corresponding to the variable traction bar (6), and the left end of the guide double-ball bars (4) is rotationally connected with the left end of the variable traction bar (6).
3. The process for producing a cross-linked polyethylene pipe according to claim 2, wherein the temperature-sensitive deformation strip (602) is made of a multi-section memory wire and is in a heat-shrinkable cold-stretchable deformed state.
4. A process for producing a crosslinked polyethylene pipe according to claim 3, wherein the specific process of sizing and guiding in step S4 is as follows:
s41, approaching through heat induction, and primarily guiding the pipe blank by the flexible smoothing sleeve (3) which is expanded in a horn shape before the pipe blank is extruded from a die opening to be continuously close to the flexible smoothing sleeve (3);
the heat transfer of the pipe blank can act on the temperature-sensing deformation strip (602) through the variable traction strip (6), so that the temperature-sensing deformation strip (602) generates first heat shrinkage deformation, and the flexible smoothing sleeve (3) is gradually driven to generate deformation close to the outer end of the pipe blank under the limitation of the guide double-ball rod (4);
s42, performing deformation lamination, namely continuously generating action by heat accumulation after the pipe blank is guided by the flexible flattening sleeve (3) to continuously advance, so that the temperature-sensing deformation strip (602) generates second heat shrinkage deformation, and driving the flexible flattening sleeve (3) to continuously generate deformation close to the outer end of the pipe blank under the limit of the guide double-ball rod (4) and form a lamination state with the outer end of the pipe blank;
s43, sizing guiding, namely after continuous extrusion of the pipe blank, due to stability of heat transfer and deformation of the temperature-sensing deformation strip (602), the flexible smoothing sleeve (3) continuously forms a fitting state under the limitation of the temperature-sensing deformation strip (602), and further continuous sizing guiding of the pipe blank is achieved.
5. The production process of the crosslinked polyethylene pipe according to claim 2, wherein the inner wall of the temperature sensing cavity (601) is fixedly connected with a plurality of limiting snap rings (7), and limiting clamping grooves matched with the variable traction strips (6) are formed in the inner wall of the limiting snap rings (7).
6. The process for producing a crosslinked polyethylene pipe according to claim 5, wherein the retainer ring (7) is made of a flexible material, and the retainer ring (7) is deformed in a radial direction thereof.
7. The production process of the crosslinked polyethylene pipe according to claim 2, wherein an auxiliary sizing sleeve (5) is fixedly connected to the inner wall of the flexible smoothing sleeve (3), the auxiliary sizing sleeve (5) is made of an elastic material, and is in an arc-shaped bending state with high left and low right in an unstressed state.
8. The process for producing the crosslinked polyethylene pipe according to claim 2, wherein a vacuum sizing cavity (1201) is formed in the vacuum sizing pipe sleeve (12), a pair of cooling water pipes communicated with the vacuum sizing cavity (1201) are fixedly connected to the left end and the right end of the outer end of the vacuum sizing pipe sleeve (12), and two cooling water pipes positioned at the same end are respectively positioned on the upper side and the lower side of the vacuum sizing pipe sleeve (12).
9. The process for producing the crosslinked polyethylene pipe according to claim 8, wherein a pair of isolation plates (14) are fixedly connected to the outer end of the sizing core pipe (13), the two isolation plates (14) are positioned at the left end and the right end of the cooling water pipe directly, and the vacuum sizing cavity (1201) is divided, so that the vacuum sizing cavity (1201) positioned at the end, away from the two isolation plates (14), is a cooling water circulation area.
10. The production process of the crosslinked polyethylene pipe according to claim 9, wherein a plurality of vacuum adsorption holes (1301) are formed in the outer end of the sizing core pipe (13), the vacuum adsorption holes (1301) are distributed between the two isolation plates (14), an exhaust pipe communicated with the vacuum sizing cavity (1201) is fixedly connected to the lower end of the vacuum sizing pipe sleeve (12), the exhaust pipe is located between the two isolation plates (14), the vacuum sizing cavity (1201) located between the two isolation plates (14) is a vacuum pumping area, the vacuum sizing core pipe (13) is acted through the vacuum adsorption holes (1301), and the vacuum sizing strength of the sizing core pipe (13) is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310171424.3A CN116039048B (en) | 2023-02-27 | 2023-02-27 | Production process of crosslinked polyethylene pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310171424.3A CN116039048B (en) | 2023-02-27 | 2023-02-27 | Production process of crosslinked polyethylene pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116039048A true CN116039048A (en) | 2023-05-02 |
| CN116039048B CN116039048B (en) | 2023-10-31 |
Family
ID=86120202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310171424.3A Active CN116039048B (en) | 2023-02-27 | 2023-02-27 | Production process of crosslinked polyethylene pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116039048B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3218380A (en) * | 1961-02-10 | 1965-11-16 | Ici Ltd | Process and apparatus for the manufacture of thermoplastic film |
| GB1469646A (en) * | 1973-03-19 | 1977-04-06 | Graenges Essem Plast As | Method for the production of pipe lengths of varying cross- section of thermoplastics material and apparatus for carrying out the method |
| EP1803540A1 (en) * | 2005-12-29 | 2007-07-04 | INOEX GmbH | Continuously adjustable calibrating sleeve for extruded plastic pipes |
| CN101497235A (en) * | 2009-02-24 | 2009-08-05 | 广东联塑科技实业有限公司 | Production facility and production method of plastic pipeline for on-line diameter changing |
| CN101544058A (en) * | 2008-03-28 | 2009-09-30 | 北京化工大学 | Process and device for preparing biaxial-oriented plastic pipe |
| CN103568290A (en) * | 2012-08-11 | 2014-02-12 | 宁波康润机械科技有限公司 | Sizing sleeve with variable diameter |
| EP3124199A1 (en) * | 2015-07-27 | 2017-02-01 | INOEX GmbH | Infinitely adjustable calibration sleeve for extruded plastic pipes |
| CN110625905A (en) * | 2019-10-15 | 2019-12-31 | 吕延泉 | High-temperature low-expansion-ratio online axial-orientation-reinforced toughened PVC-C pipe extrusion device and method |
| CN211518457U (en) * | 2019-12-12 | 2020-09-18 | 咸阳新德安新材料科技有限公司 | Flexible composite sizing sleeve for high-pressure delivery pipe |
-
2023
- 2023-02-27 CN CN202310171424.3A patent/CN116039048B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3218380A (en) * | 1961-02-10 | 1965-11-16 | Ici Ltd | Process and apparatus for the manufacture of thermoplastic film |
| GB1469646A (en) * | 1973-03-19 | 1977-04-06 | Graenges Essem Plast As | Method for the production of pipe lengths of varying cross- section of thermoplastics material and apparatus for carrying out the method |
| EP1803540A1 (en) * | 2005-12-29 | 2007-07-04 | INOEX GmbH | Continuously adjustable calibrating sleeve for extruded plastic pipes |
| CN101544058A (en) * | 2008-03-28 | 2009-09-30 | 北京化工大学 | Process and device for preparing biaxial-oriented plastic pipe |
| CN101497235A (en) * | 2009-02-24 | 2009-08-05 | 广东联塑科技实业有限公司 | Production facility and production method of plastic pipeline for on-line diameter changing |
| CN103568290A (en) * | 2012-08-11 | 2014-02-12 | 宁波康润机械科技有限公司 | Sizing sleeve with variable diameter |
| EP3124199A1 (en) * | 2015-07-27 | 2017-02-01 | INOEX GmbH | Infinitely adjustable calibration sleeve for extruded plastic pipes |
| CN110625905A (en) * | 2019-10-15 | 2019-12-31 | 吕延泉 | High-temperature low-expansion-ratio online axial-orientation-reinforced toughened PVC-C pipe extrusion device and method |
| CN211518457U (en) * | 2019-12-12 | 2020-09-18 | 咸阳新德安新材料科技有限公司 | Flexible composite sizing sleeve for high-pressure delivery pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116039048B (en) | 2023-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4863365A (en) | Method and apparatus for deforming reformable tubular pipe liners | |
| CN104785563B (en) | Method with bottom long tubular workpiece precise extrusion molding | |
| NL1012032C2 (en) | Method for manufacturing a tube of biaxially oriented thermoplastic plastic material. | |
| CN106825341B (en) | A kind of band muscle larger ratio of height to diameter thin-walled ring jam combined shaping method | |
| CN102216000B (en) | For the manufacture of a kind of method being provided with the profiled member of a through hole | |
| CN203044648U (en) | Local quench hardening forming die for super-strength steel plate | |
| CN101642865A (en) | Deformation-free thermal extrusion method for helix slow-wave component preparation | |
| CN116039048B (en) | Production process of crosslinked polyethylene pipe | |
| CN102500710A (en) | Automatic tee shaping equipment and shaping method thereof | |
| CN108568471A (en) | The set group of method and punch and mould for manufacturing and being formed cartridge clip housing blank | |
| CN107309318B (en) | Plate radial direction differential temperature spinning apparatus and process | |
| US20040074275A1 (en) | Hot metal extru-bending machine | |
| CN114260327A (en) | Method for preparing axial variable cross-section pipe by radial continuous extrusion | |
| CN110328250A (en) | A kind of Equal Channel Angular Extrusion Processing method of tubing | |
| CN116371987A (en) | Integral forming device for coiled pipe for boiler | |
| CN104942170A (en) | Expansion head structure and tube expansion equipment provided with same | |
| CN112570482B (en) | Metal curvature section twisting extrusion forming device and method | |
| US3302241A (en) | Apparatus for preparation of plastic tubes | |
| WO1984001920A1 (en) | Method for orientation of the material of plastic tubes | |
| CN111014552B (en) | Blank making method and die for long-shaft forge pieces | |
| CN110587965A (en) | Multistage temperature control machining forming device and machining method for PVC-O pipe | |
| CN110323528A (en) | A kind of processing unit (plant) and its processing method of wedge-shaped rectangular waveguide | |
| CN204398315U (en) | A kind of lens forming machine | |
| RU2710198C1 (en) | Method of producing shells from square-shaped sheet workpieces | |
| CN213564198U (en) | Injection mold capable of being cooled rapidly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |