CN111716675A - Production line and manufacturing method of polyurethane thermal insulation plastic composite pipe with plastic outer protective pipe - Google Patents
Production line and manufacturing method of polyurethane thermal insulation plastic composite pipe with plastic outer protective pipe Download PDFInfo
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- CN111716675A CN111716675A CN202010542654.2A CN202010542654A CN111716675A CN 111716675 A CN111716675 A CN 111716675A CN 202010542654 A CN202010542654 A CN 202010542654A CN 111716675 A CN111716675 A CN 111716675A
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- polyurethane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
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- 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
- B29L2023/22—Tubes or pipes, i.e. rigid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a pipeline production line and a manufacturing method for building engineering. Aims to provide a production line and a manufacturing method of a polyurethane heat-preservation plastic composite pipe with a plastic outer protective pipe; the production line and the manufacturing method have the characteristics of continuous production, stable quality, environmental protection, safety and the like. The technical scheme is as follows: a production line of a polyurethane heat-insulation plastic composite pipe with a plastic outer protective pipe comprises a first plastic extruder for manufacturing an inner pipe; the method is characterized in that: the production line also comprises a polyurethane forming machine for manufacturing a polyurethane foaming layer on the outer surface of the inner pipe, a second plastic extruder for manufacturing an outer protective layer on the outer surface of the polyurethane foaming layer, a second traction machine for providing traction force for the composite pipe in the manufacturing process and a cutting machine for cutting the composite pipe according to the fixed length requirement in sequence.
Description
Technical Field
The invention relates to a pipeline production line and a manufacturing method for constructional engineering, in particular to a production line of a polyurethane heat-insulation plastic composite pipe with a plastic outer protective pipe and a manufacturing method of the composite pipe.
Background
Most of heating or air-conditioning heat-insulating pipelines adopted in the building construction industry at present are plastic outer protective pipe polyurethane heat-insulating plastic composite pipes (shown in figure 1), and the structure of the heat-insulating plastic composite pipes is that a polyurethane foaming layer 30 and a plastic outer protective layer 40 (outer pipe) are sequentially coated outside a tubular plastic inner pipe 20 from inside to outside. The manufacturing method is manual fixed-length production; inserting an inner pipe cut to about 4 meters into the center of an inner cavity of an outer pipe, placing a bracket between the inner pipe and the outer pipe to keep the coaxiality of the inner pipe and the outer pipe, then sealing two ends of the outer pipe, and drilling a material injection hole on the surface of the outer pipe; then the mixed polyurethane foaming raw materials are injected from the injection holes, so that polyurethane foaming is carried out between the inner pipe and the outer pipe to form the heat insulation layer. However, the manual fixed-length foaming production brings the following problems: 1) manual operation, the product quality is unstable; 2) the manual use is more, and the efficiency is low; 3) the occupied area of a production field is large; 4) toxic gas is discharged in chemical reaction, and the health of human body is affected.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a production line and a manufacturing method of a plastic outer protective pipe polyurethane heat-preservation plastic composite pipe; the production line and the manufacturing method have the characteristics of continuous production, stable quality, environmental protection, safety and the like.
The technical scheme provided by the invention is as follows:
a manufacturing method of a polyurethane heat-insulation plastic composite pipe with a plastic outer protective pipe comprises the following steps:
1) the plastic film continuously released by the unreeling device is coiled into a tubular shape by a collar forming device, then the plastic film is input into a horizontally arranged tubular shaping mold and moves forward by being close to the inner wall of the mold under the coordination of traction force;
2) the inner pipe continuously extruded by the first plastic extruder enters a collar former, is inserted into the center of a tubular plastic film and enters a shaping die along with the plastic film;
3) a polyurethane casting device arranged above the collar former continuously injects a polyurethane foaming material between the inner pipe and the plastic film, and then the polyurethane casting device and the plastic film are coated on the outer circumferential surface of the inner pipe together by the collar former and then enter a shaping mold together;
4) a constant temperature control device (5-8) arranged outside the shaping mold heats the polyurethane foaming material in the shaping mold, so that the polyurethane foaming material coated outside the inner tube is heated and foamed to form a primary product (20-1); then outputting from the shaping die;
5) the primary product enters a die of a second plastic extruding machine, and an outer protective layer is extruded outside the tubular plastic film by the second plastic extruding machine; and then cooling and cutting are carried out, thus finishing the process.
When the inner pipe in the step 2) enters the collar forming device, the brackets are installed on the outer surface of the inner pipe one by one at equal intervals, then the inner pipe is inserted into the center of the tubular plastic film, and the inner pipe and the plastic film enter a shaping mold together forward.
The plastic film in the step 2) is gradually released from the unreeling device and guided to the collar forming device through a plurality of guide wheels.
The heating temperature in the step 4) is 20-60 ℃.
A production line of a polyurethane heat-insulation plastic composite pipe with a plastic outer protective pipe comprises a first plastic extruder for manufacturing an inner pipe; the method is characterized in that: the production line also sequentially comprises a polyurethane forming machine for manufacturing a polyurethane foaming layer on the outer surface of the inner pipe, a second plastic extruder for manufacturing an outer protective layer on the outer surface of the polyurethane foaming layer, a second traction machine for providing traction force for the composite pipe in the manufacturing process and a cutting machine for cutting the composite pipe according to the fixed length requirement;
the polyurethane forming machine comprises a tubular forming die, a collar former, a polyurethane pouring device and a constant temperature control device, wherein the tubular forming die is horizontally arranged to control the outer diameter of a foaming material coated on the outer surface of an inner pipe, the collar former is used for rolling a plastic film into a tubular shape and enabling the plastic film to be close to and be fully distributed on the whole inner wall of the forming die by virtue of traction force, the polyurethane pouring device is arranged at the top of the collar former so as to pour the polyurethane foaming material between the inner pipe and the tubular plastic film, and the constant temperature control device is arranged on the forming die and is used for heating the polyurethane foaming material; alternatively, the first and second electrodes may be,
the polyurethane forming machine comprises a cylindrical forming die, a collar former, a polyurethane pouring device and a semicircular tube sheet type circulating forming machine, wherein the cylindrical forming die is horizontally arranged to control the outer diameter of a foaming material coated on the outer surface of an inner tube, the collar former is used for rolling a plastic film into a tube shape and enabling the plastic film to be close to and fully distributed on the whole inner wall of the cylindrical forming die by means of traction force, the polyurethane pouring device is arranged at the top of the collar former so as to pour a polyurethane foaming material between the inner tube and the cylindrical plastic film, and the semicircular tube sheet type circulating forming machine is arranged at the rear side of the cylindrical forming die so as to receive an.
The cylindrical shaping mold is a tubular body formed by two semicircles.
The constant temperature control device is arranged on the shaping mold to realize relay heating of the foaming material in the shaping mold.
And a first tractor is arranged between the first plastic extruder and the polyurethane setting machine, so that the inner pipe output by the first plastic extruder enters the polyurethane setting machine in order.
The first plastic extruder sequentially comprises an extrusion main machine, a forming die, a vacuum sizing box and a corona machine.
The semicircular tube sheet type circulating setting machine is provided with an air heater for heating the semicircular tube sheet.
The invention has the beneficial effects that:
1) the production line is operated continuously, so that the product quality is ensured;
2) the production is improved by times, and the labor is greatly reduced (only 1 worker needs to take supervision);
3) the occupied area of the production field is small (one third of the existing production equipment);
4) the foaming is automatic, and the toxic gas can be directly treated and then discharged; and ensures environmental friendliness.
Drawings
Fig. 1 is a schematic structural view of a polyurethane thermal insulation plastic composite pipe with a plastic outer protective pipe.
Fig. 2 is a schematic front view of the present invention.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
Fig. 4 is an enlarged schematic view of a portion B in fig. 2.
Fig. 5 is an enlarged schematic view of the portion C in fig. 2.
Fig. 6 is an enlarged schematic view of a portion D in fig. 2.
Fig. 7 is an enlarged schematic view of a portion E in fig. 2.
Fig. 8 is an enlarged schematic view of a portion F in fig. 2.
Fig. 9 is an enlarged schematic view of a portion G in fig. 2.
Fig. 10 is a perspective enlarged view schematically showing the structure of the neck collar former of the present invention.
Fig. 11 is a schematic view showing the fitting relationship of the inner tube and the neck collar former.
Fig. 12 is a schematic view illustrating an operation state when a plastic film discharged from an unwinding device passes through a collar forming machine.
Fig. 13 is a schematic layout of a semicircular tube sheet type circulating setting machine.
Fig. 14 is a schematic sectional structure view of H-H in fig. 13.
FIG. 15 is a schematic cross-sectional view of the inner tube of FIG. 6 positioned at the front of the polyurethane pourer.
Fig. 16 is a front view of the bracket of fig. 15.
Detailed Description
The following is a further description of the embodiments with reference to the drawings.
The production line of the plastic outer protective pipe polyurethane heat-preservation plastic composite pipe shown in the attached drawing comprises a first plastic extruder 1; the plastic extruder further comprises a polyurethane setting machine 5, a second plastic extruder 7, a second tractor 9 and a cutting machine 10 which are sequentially arranged behind the first plastic extruder; the polyurethane setting machine is used for manufacturing a polyurethane foaming layer 30 on the outer surface of the inner pipe 20; the second plastic extruder is used for manufacturing an outer protective layer 40 on the outer surface of the polyurethane foaming layer; the second tractor is used for providing traction force for the composite pipe in the manufacturing process, and the cutting machine cuts the manufactured composite pipe in a fixed length mode according to requirements.
In the above equipment, except the polyurethane setting machine 5, the rest is the existing conventional equipment.
The polyurethane setting machine; the tubular shaping die 5-1 is horizontally arranged and controls the outer diameter of the foaming material coated on the outer surface of the inner tube; the plastic film 5-6 is guided by a plurality of guide wheels 5-5 and is drawn to a collar former 5-2, the collar former rolls the plastic film 5-6 into a tubular shape, and the plastic film is close to and is distributed on the whole inner wall of the sizing die under the coordination of the traction force; a polyurethane casting device 5-3 (conventional equipment) is arranged at the top of the collar former, and a polyurethane foaming material is accurately cast between the inner pipe and the tubular plastic film; and 5-8 constant temperature control devices (conventional equipment) are arranged on the shaping mold and used for heating the polyurethane foaming material to enable the polyurethane foaming material to be foamed and molded.
As shown in fig. 10: the collar former (prior art) is a hollow pipe with two axes forming an acute angle and the pipe walls connected with each other, wherein, the first pipeline 5-21 is horizontally arranged, and the right end opening thereof is connected with the inner wall of the shaping mould; one end of the second pipe 5-22 intersects the first pipe, and the inner and outer surfaces of the mutual connection portion (intersection line portion) of the two pipes are seamlessly and smoothly transited. In use (see fig. 11 and 12), the plastic film 5-6 released by the unreeling device 5-7 is guided by the plurality of guide wheels 5-5 and moves upwards close to the outer part of the second pipeline (the plastic film is completely unfolded by the outer wall of the second pipeline in the moving process), then turns over to cross the connecting part of the two pipelines and moves rightwards through the inner cavity of the first pipeline, so that the plastic film is formed into a cylindrical shape and is completely drawn against the inner wall of the first pipeline to move.
Furthermore, the cylindrical shaping mould is a separable cylindrical pipeline consisting of two semicircles or an independent cylindrical pipeline; to facilitate manufacture and maintenance.
Further, the constant temperature control device (composed of a water jacket and a mold temperature controller) is arranged on the shaping mold to perform relay heating on the foaming material in the shaping mold so as to ensure the foaming effect. The heating temperature is usually selected to be 20-60 ℃ and is controlled by a mold temperature controller 5-9. .
Further, a first tractor 4 is arranged between the first plastic extruder and the polyurethane setting machine, so that the inner pipes output by the first plastic extruder sequentially enter the polyurethane setting machine at a constant speed.
The first plastic extruder sequentially comprises an extrusion main machine 1-2, a forming die 1-1, a vacuum sizing box 2 and a corona machine 3.
Further, the polyurethane setting machine can also adopt continuous type circulating operation equipment; the equipment is horizontally provided with a cylindrical shaping mold 5-1 for controlling the outer diameter of a foaming material coated on the outer surface of an inner pipe, a collar former for rolling a plastic film into a tubular shape and enabling the plastic film to be close to and be fully distributed on the whole inner wall of the cylindrical shaping mold by virtue of traction force, a polyurethane pouring device arranged at the top of the collar former for pouring a polyurethane foaming material between the inner pipe and the tubular plastic film, and a semi-circular tube sheet type circulating shaping machine arranged at the rear side of the cylindrical shaping mold for receiving an initial product output from the cylindrical shaping mold, heating and carrying out external shaping;
the semicircular tube sheet type circulating setting machine (in the prior art) comprises two semicircular tube sheet machines which are symmetrically arranged on a setting mould, wherein each tube sheet machine comprises a closed transmission chain capable of circularly moving, a plurality of semicircular tube sheets 21 driven by the transmission chain and a motor for driving the transmission chain; the part of the semicircular duct pieces continuously running to the middle position of the two semicircular duct pieces on each duct piece machine are mutually matched with the part of the semicircular duct pieces continuously running to the middle position of the two semicircular duct piece machines on the other duct piece machine to be spliced into a cylindrical shaping cylinder 22 (an air heater 21 is usually adopted to heat the semicircular duct pieces before splicing and folding so as to improve the heat preservation and shaping effects); the cylindrical shaping mold 5-1 is horizontally arranged, the outer diameter of the foaming material coated on the outer surface of the inner pipe is controlled, then the foaming material is conveyed to a cylindrical inlet of the semicircular pipe sheet type circulating shaping machine, and then the foaming material is subjected to heat preservation shaping treatment of the shaping cylinder of the semicircular pipe sheet type circulating shaping machine for a period of time, the shaping cylinder of the cylindrical structure is gradually separated at the other end of the equipment, the two separated semicircular pipe sheets are respectively driven by a transmission chain to circularly move, and the primary product subjected to heat preservation foaming shaping continuously moves forwards to the next procedure. The collar former 5-2 is used for rolling the plastic film 5-6 into a tubular shape as described above, and enabling the plastic film to be close to and spread over the whole inner wall of the sizing die under the cooperation of traction force; the polyurethane casting device 5-3 is arranged at the top of the collar forming device, and the polyurethane foaming material is accurately cast between the inner pipe and the tubular plastic film.
The working principle of the production line is as follows:
a first plastic extruder 1 extrudes a hot molten plastic hollow pipe through a forming die 1-1, the hot molten plastic hollow pipe enters a vacuum sizing box 2 for forming under the action of a first tractor 4, a formed plastic pipe (namely an inner pipe 20) is subjected to surface roughening treatment by a corona machine 3 and then is provided with a pair of brackets (the brackets are in the prior art and comprise an upper bracket 12-1 and a lower bracket 12-2 which are made of plastic materials, and the thickness of the brackets which is generally vertical to a paper surface of a figure 16 is 10-20 mm) at equal intervals (generally, the upper bracket and the lower bracket are buckled and fixed on the surface of the inner pipe, and the distance between every two pairs of brackets is kept, so that the coaxiality of the inner pipe and a cylindrical forming die or a forming cylinder formed after folding is ensured), and the plastic hollow pipe enters a collar forming device 5-2 through the first tractor; the plastic film 5-6 is discharged from an unreeling device 5-7 at the bottom of the polyurethane setting machine (the direction is an arrow M), is formed into a circular tube shape by a collar forming machine and is tightly attached to the inner wall of the setting mould 5-1. The upper part of the collar former is provided with a polyurethane casting machine 5-3, and the mixed polyurethane foaming material flows out under the action of pressure and is positioned between the plastic film and the inner pipe. The second tractor 9 pulls the plastic film and the inner pipe to move at a constant speed and enter the shaping die. The liquid raw material injected by the polyurethane pouring device 5-3 is rapidly foamed in the shaping mould to fill the cavity of the whole shaping mould. The foaming process is continuous, the injected raw materials and the fed inner pipe 20 continuously enter a shaping die to finish shaping of the foaming machine (or enter a semicircular pipe sheet type circulating shaping machine for shaping); and forming a polyurethane heat-insulating layer 30 on the outer circumferential surface of the inner pipe after shaping. The initial polyurethane heat-insulating pipe product 20-1 coming out of the sizing die at a constant speed (the direction is an arrow N) enters the inner cavity of the composite die 6 of the second plastic extruder 7, the molten plastic is extruded from the die orifice of the composite die and is coated on the outer surface of the polyurethane heat-insulating layer, and then the molten plastic enters the cooling box 8, so that the outer protective layer 40 of the polyurethane heat-insulating pipe is quickly sized and pulled out at a constant speed, and the traction force in the whole process is provided by the second tractor 9. The finished tubes from the second tractor may be cut to length by a cutter 10 and stacked (temporarily on a stacking table 11) or wound up for storage as required. Thus completing the production.
Claims (9)
1. A manufacturing method of a polyurethane heat-insulation plastic composite pipe with a plastic outer protective pipe comprises the following steps in sequence:
1) the plastic film continuously released by the unreeling device (5-7) is rolled into a cylinder shape by the collar forming device (5-2), then is input into a horizontally arranged cylinder-shaped shaping mold (5-1), and moves forward by being close to the inner wall of the mold under the coordination of traction force;
2) an inner pipe (20) continuously extruded by a first plastic extruder (1) enters a collar former, is inserted into the center of a cylindrical plastic film and enters a shaping die along with the plastic film;
3) a polyurethane casting device (5-3) arranged above the collar former continuously injects a polyurethane foaming material between the inner pipe and the plastic film, and then the polyurethane foaming material and the plastic film are coated on the outer circumferential surface of the inner pipe together by the collar former and then enter a shaping mould together;
4) a constant temperature control device (5-8) arranged outside the shaping mold is used for heating the polyurethane foaming material in the shaping mold, so that the polyurethane foaming material coated outside the inner tube is heated and foamed to form a primary product (20-1); then outputting from the shaping die;
5) the primary product enters a die of a second extruding machine, and an outer protective layer is extruded outside the cylindrical plastic film by the second extruding machine (7); and then cooling and cutting are carried out, thus finishing the process.
2. The manufacturing method of the polyurethane thermal insulation plastic composite pipe with the plastic outer protective pipe according to claim 1 is characterized in that: when the inner pipe in the step 2) enters the collar forming device, the brackets are installed on the outer surface of the inner pipe one by one at equal intervals, then the inner pipe is inserted into the center of the tubular plastic film, and the inner pipe and the plastic film enter a shaping mold together forward.
3. The manufacturing method of the polyurethane thermal insulation plastic composite pipe with the plastic outer protective pipe according to claim 2 is characterized in that: the plastic film in the step 2) is gradually released from the unreeling device (5-7) and guided to the collar forming device through a plurality of guide wheels (5-5).
4. The manufacturing method of the polyurethane thermal insulation plastic composite pipe with the plastic outer protective pipe according to claim 3 is characterized in that: the heating temperature in the step 4) is 20-60 ℃.
5. A production line of a polyurethane heat-insulation plastic composite pipe with a plastic outer protective pipe comprises a first plastic extruder (1) for manufacturing an inner pipe; the method is characterized in that:
the production line also comprises a polyurethane forming machine (5) for manufacturing a polyurethane foaming layer on the outer surface of the inner pipe, a second plastic extruder (7) for manufacturing an outer protective layer on the outer surface of the polyurethane foaming layer, a second traction machine (9) for providing traction force for the composite pipe in the manufacturing process and a cutting machine (10) for cutting the composite pipe at fixed length in sequence;
the polyurethane forming machine comprises a cylindrical forming die (5-1) which is horizontally arranged to control the outer diameter of a foaming material coated on the outer surface of an inner pipe, a collar former (5-2) which rolls a plastic film into a cylindrical shape and enables the plastic film to be close to and be fully distributed on the whole inner wall of the forming die by virtue of traction force, a polyurethane casting device (5-3) which is arranged at the top of the collar former to cast the polyurethane foaming material between the inner pipe and the cylindrical plastic film, and a constant temperature control device (5-8) which is arranged on the forming die and heats the polyurethane foaming material to enable the polyurethane foaming material to be formed; alternatively, the first and second electrodes may be,
the polyurethane forming machine comprises a cylindrical forming die, a collar former, a polyurethane pouring device and a semi-circular tube sheet type circulating forming machine, wherein the cylindrical forming die is horizontally arranged to control the outer diameter of a foaming material coated on the outer surface of an inner tube, the collar former is used for rolling a plastic film into a tubular shape and enabling the plastic film to be close to and be fully distributed on the whole inner wall of the cylindrical forming die by means of traction force, the polyurethane pouring device is arranged at the top of the collar former to pour a polyurethane foaming material between the inner tube and the tubular plastic film, and the semi-circular tube sheet type circulating forming machine is arranged at the rear side of the cylindrical forming die to receive an.
6. The production line of the plastic outer protective pipe and polyurethane thermal insulation plastic composite pipe according to claim 5 is characterized in that: the cylindrical shaping mould is a separable cylindrical pipeline consisting of two semicircles or an independent cylindrical pipeline.
7. The production line of the plastic outer protective pipe and polyurethane thermal insulation plastic composite pipe according to claim 6 is characterized in that: the constant temperature control device consists of a water jacket and a mold temperature controller.
8. The production line of the plastic outer protective pipe and polyurethane thermal insulation plastic composite pipe according to claim 7 is characterized in that: a first tractor (4) is arranged between the first plastic extruder and the polyurethane setting machine, so that the inner pipe output by the first plastic extruder enters the polyurethane setting machine in order.
9. The production line of the plastic outer protective pipe and polyurethane thermal insulation plastic composite pipe according to claim 8 is characterized in that: the first plastic extruder sequentially comprises an extrusion main machine (1-2), a forming die (1-1), a vacuum sizing box (2) and a corona machine (3).
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| CN202010542654.2A CN111716675A (en) | 2020-06-15 | 2020-06-15 | Production line and manufacturing method of polyurethane thermal insulation plastic composite pipe with plastic outer protective pipe |
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| CN202010542654.2A CN111716675A (en) | 2020-06-15 | 2020-06-15 | Production line and manufacturing method of polyurethane thermal insulation plastic composite pipe with plastic outer protective pipe |
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| CN208148463U (en) * | 2018-04-18 | 2018-11-27 | 四川金石东方新材料设备股份有限公司 | Temperature controllable sizing ring mechanism |
| CN208305762U (en) * | 2018-05-25 | 2019-01-01 | 唐山兴邦管道工程设备有限公司 | A kind of polyurethane thermal pipe outer jacket sided corona treatment calibration sleeve |
| CN109551776A (en) * | 2019-01-08 | 2019-04-02 | 浙江伟星新型建材股份有限公司 | Polyolefin based polyurethane composite insulating pipe one step processing equipment and technique |
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