CN108297377B - Heating device in double-wall corrugated pipe extrusion die head - Google Patents
Heating device in double-wall corrugated pipe extrusion die head Download PDFInfo
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- CN108297377B CN108297377B CN201810005424.5A CN201810005424A CN108297377B CN 108297377 B CN108297377 B CN 108297377B CN 201810005424 A CN201810005424 A CN 201810005424A CN 108297377 B CN108297377 B CN 108297377B
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- groove
- strip
- spiral
- heating element
- transition
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Classifications
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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
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/865—Heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
Abstract
The invention discloses a heating device in a double-wall corrugated pipe extrusion die head, which comprises a strip-shaped heating element and a temperature controller for controlling the temperature of the heating element, wherein a supporting pipe is inserted in a central channel of the extrusion die head, a water inlet and return pipeline is arranged in the supporting pipe in a penetrating manner, the outer side wall of the supporting pipe is provided with a containing groove and at least one spiral groove, the outer end of the spiral groove penetrates through the outer end surface of the supporting pipe, which is positioned outside the central channel, the heating element is embedded in the spiral groove, a temperature control element is embedded in the containing groove, and the heating element and the temperature control element are respectively and. The invention is convenient for installing the heater in the extrusion die head of the double-wall corrugated pipe with small pipe diameter, thereby being beneficial to improving the production efficiency and the yield of the double-wall corrugated pipe.
Description
Technical Field
The invention relates to the technical field of plastic molding machinery, in particular to an internal heating device of a double-wall corrugated pipe extrusion die head.
Background
The double-wall corrugated pipe is a novel pipe with an outer wall with an annular structure and a smooth inner wall, the working temperature of the double-wall corrugated pipe is between 40 ℃ below zero and 60 ℃, the double-wall corrugated pipe is high in strength and strong in anti-seismic performance, and the resistance of fluid in the pipe is small. Double-walled corrugated tubing is typically formed by extrusion, and in the prior art, internal heaters such as cast aluminum heaters or mica heaters are typically disposed within the central passage of an extrusion die used to produce double-walled corrugated tubing. However, when the diameter of the double-wall corrugated pipe is small, the size of the extrusion die head for producing the double-wall corrugated pipe is correspondingly reduced, and corresponding water inlet and return pipelines are required to be arranged in the central channel of the extrusion die head in a penetrating way, so that the central channel of the extrusion die head is difficult to arrange and install the existing internal heater such as a cast aluminum heater or a mica heater, and particularly, when the length of the central channel is long, the problem is more serious, and the yield and the production efficiency of the double-wall corrugated pipe are greatly influenced by the extrusion die head without the internal heater.
Disclosure of Invention
The invention aims to solve the problem that the yield and the production efficiency of a double-wall corrugated pipe are influenced due to the difficulty in arranging an internal heater in a double-wall corrugated pipe extrusion die head for forming the small-diameter double-wall corrugated pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
the heating device comprises a strip-shaped heating element and a temperature controller used for controlling the temperature of the heating element, a supporting pipe is inserted in a central channel of the extrusion die, a water inlet and return pipeline is arranged in the supporting pipe in a penetrating mode, a containing groove and at least one spiral groove are formed in the outer side wall of the supporting pipe, the outer end of the spiral groove penetrates through the outer end face, located outside the central channel, of the supporting pipe, the heating element is embedded in the spiral groove, a temperature control element is embedded in the containing groove, and the heating element and the temperature control element are respectively electrically connected with the temperature controller.
The invention arranges a supporting tube in the central channel of the extrusion die head, and arranges the spiral groove on the outer side wall of the supporting tube, thus, the strip heating element such as the electric heating strip can be embedded in the spiral groove conveniently, and then the supporting tube is inserted into the central channel of the extrusion die head, thereby greatly simplifying the installation of the heating element. Particularly, for the extrusion die head with smaller diameter and longer length, the technical scheme of the invention can ensure that the extrusion die head is conveniently provided with the internal heating device, and the support pipe can also be conveniently penetrated and arranged in the water inlet and return pipeline, and simultaneously, the direct contact between the heating element and the water inlet and return pipeline is avoided. Because the heating element is embedded in the spiral groove, the heating element can heat the extrusion die more uniformly. It can be understood that the heating temperature of the heating element can be accurately controlled by the action of the temperature control element and the temperature controller, and the temperature control element arranged in the accommodating groove on the outer side wall of the support tube can accurately sense the heating temperature of the heating element on the extrusion die head.
Preferably, the number of the spiral grooves is 2, the spiral grooves are distributed at intervals in the circumferential direction of the supporting tube, the inner end and the outer end of each spiral groove are respectively communicated with the inner end surface and the outer end surface of the supporting tube, the 2 spiral grooves are communicated with each other through transition grooves at positions close to the inner end surface of the supporting tube, the accommodating groove is located in the middle of the central channel in the length direction, a spiral guide groove is further arranged on the outer side wall of the supporting tube, one end of the guide groove is communicated with the outer end surface of the supporting tube, the other end of the guide groove is communicated with the accommodating groove.
Because the surface of the supporting tube is provided with 2 spiral grooves, the strip-shaped heating element can be embedded in one spiral groove from the outer end to the inner end of the supporting tube, and then is embedded in the other spiral groove after being bent at the transition groove, so that two control ends of the heating element are both positioned at the outer end of the supporting tube, the circuit arrangement is convenient, and the uniform heating of the heating element is facilitated. The temperature control element is connected with the temperature controller through the connecting lead spirally embedded in the guide groove on the surface of the support tube, so that a uniform distance is formed between the connecting lead and the heating element.
Preferably, the heating element is a glass fiber heating tape. The glass fiber heating belt has good insulating property and high temperature resistance, and can be conveniently bent and wound, thereby being beneficial to the arrangement on the surface of the supporting tube.
Preferably, a teflon high-temperature adhesive tape is wound on the outer side of the support tube. The Teflon high-temperature adhesive tape can bear the high temperature generated by the heating element and can form better insulation protection for the heating element, so that the heating element and the supporting pipe form a whole, and the supporting pipe is convenient to be inserted into the central channel of the extrusion die head.
Preferably, the cross section of the spiral groove is rectangular, a limiting groove corresponding to the spiral groove is arranged on the inner side wall of the central channel of the extrusion die head, an elastic insulating strip is embedded in the limiting groove, and the height of the insulating strip is greater than the depth of the limiting groove, so that one side of the insulating strip, which is higher than the limiting groove, is limited in the spiral groove and abuts against the heating element in the spiral groove.
In this scheme, set up the spacing groove that corresponds with the helicla flute of stay tube on the central channel inside wall to set up the insulated strip that highly is greater than the spacing groove degree of depth in the spacing groove, like this, the part that the insulated strip exceeds the spacing groove can get into to press heating element in the helicla flute that corresponds, can form good location and insulation to heating element, and the insulated strip of while cross-over between spacing groove and helicla flute is favorable to making and forms reliable location between stay tube and the extrusion die head.
Preferably, the insulation strip is installed in the limiting groove by the following method:
a. processing two spiral grooves and a transition groove on the outer side wall of the supporting tube, wherein the two spiral grooves are distributed at intervals in the circumferential direction of the supporting tube, the transition groove is arranged between the spiral grooves close to the inner end face of the supporting tube, and the two ends of the transition groove are in smooth transition connection with the spiral grooves;
b. molding and forming an insulating strip made of silicon rubber, wherein the insulating strip comprises two spiral crimping strips and a transition strip connected between the two crimping strips, the pitch diameter of the crimping strips is one half to three quarters of the pitch diameter of the spiral groove, the height of the crimping strips is greater than the depth of the limiting groove, and notches are formed in the outer sides of the transition strips, so that the height of the transition strips is smaller than that of the crimping strips;
c. embedding the heating element in the first spiral groove, bending and embedding the heating element in the transition groove, and bending and embedding the heating element in the second spiral groove;
d. opening a first crimping strip in the insulating strips and embedding the first crimping strip in a first spiral groove, then embedding a transition strip in a transition groove, then opening a second crimping strip in the insulating strips and embedding the second crimping strip in a second spiral groove, and by means of the elasticity of the insulating strips, the insulating strips shrink and tightly cover the heating element, and the crimping strips are higher than the spiral grooves, and the transition strips are sunk in the transition groove;
e. aligning the supporting tube with the central channel of the extrusion die head, aligning the crimping strip higher than the outer surface of the supporting tube with the limiting groove on the central channel, then rotating and axially moving the supporting tube forwards, and enabling the crimping strip on the supporting tube to enter the limiting groove at the moment;
f. when the supporting tube axially moves forwards and is in place, the outer side of the crimping strip is matched in the limiting groove, the inner side of the crimping strip, which is higher than the limiting groove, is limited in the spiral groove and abuts against the heating element in the spiral groove, and therefore the installation of the insulating strip is completed.
The invention forms the elastic insulating strip by a molding method, and the pitch diameter of the spiral crimping strip in the insulating strip is smaller than that of the spiral groove. Therefore, when the insulating strip is wound and embedded in the spiral groove on the surface of the supporting tube, the middle diameter of the crimping strip is expanded, so that the crimping strip is tightly stretched in the spiral groove of the supporting tube like a cowhide tendon, and the supporting tube is conveniently installed in the central channel in a spiral rotating mode. In particular, the present invention provides a gap in the outer side of the transition strip connecting the two crimping strips, so that when the insulating strip is embedded in the surface of the support tube, the surface of the transition strip is flush with or lower than the surface of the support tube, and when the support tube is installed in the central passage, the transition strip higher than the surface of the support tube is prevented from interfering.
Therefore, the invention has the following beneficial effects: the installation of the heater in the small-diameter double-wall corrugated pipe extrusion die head is facilitated, so that the production efficiency and the yield of the double-wall corrugated pipe are improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of a support tube.
Fig. 3 is another partial structural schematic of the present invention.
Fig. 4 is a schematic view of a structure of the insulating strip.
In the figure: 1. the extrusion die head 11, the central channel 12, the limiting groove 2, the supporting tube 21, the spiral groove 22, the accommodating groove 23, the transition groove 24, the guide groove 3, the heating element 4, the temperature control element 5, the water inlet and return pipeline 6, the insulating strip 61, the crimping strip 62, the transition strip 621 and the notch.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1 and 2, a heating device in a double-wall corrugated pipe extrusion die head has a cylindrical central channel 11 at the center of the extrusion die head, and specifically includes a strip-shaped heating element 3, a temperature control element 4 for sensing temperature, and a temperature controller (not shown in the figure) for controlling the temperature of the heating element, a cylindrical support pipe 2 is inserted into the central channel of the extrusion die head, a water inlet and return pipeline 5 is arranged in the support pipe in a penetrating manner, and the heating element and the temperature control element are both arranged on the outer side wall of the support pipe. It can be understood that the heating element has two control terminals, the control terminal of the heating element should be electrically connected to the thermostat, and the temperature control element has a signal output terminal, which should be electrically connected to the thermostat. Therefore, when the heating temperature is set on the temperature controller, the heating element can be started to generate heat, and the temperature control element outputs a corresponding electric signal to the temperature controller after sensing the temperature; when the temperature of the heating element reaches a set value, the temperature controller can control the working state of the heating element according to the received electric signal output by the temperature control element, so that the temperature of the heating element is controlled within a set range. Since the extrusion die and the corresponding heating element temperature control method for forming the double-wall corrugated pipe belong to the prior art, the description in this embodiment is not excessive.
For the convenience of installation, a containing groove 22 and at least one spiral groove 21 are arranged on the outer side wall of the support tube, the outer end of the spiral groove penetrates through the outer end face of the support tube, and the strip-shaped heating element is embedded in the spiral groove. In addition, the temperature control element is arranged in the accommodating groove, and the heating element and the temperature control element are respectively and electrically connected with the temperature controller through connecting wires. It should be noted that the cross section of the spiral groove is preferably rectangular, so as to facilitate the embedding of the heating element; the temperature control element can adopt a thermocouple, and the accommodating groove is preferably arranged at the midpoint position of the supporting tube corresponding to the length direction of the central channel, so that the heating temperature of the heating element can be accurately controlled. In this embodiment, the end of the support tube located inside the central passage is referred to as the inner end, and the end located outside the central passage is referred to as the outer end.
When the device is installed, heating elements such as electric heating wires are firstly spirally embedded in the spiral grooves on the surface of the supporting pipe, then the supporting pipe is inserted into the central channel of the extrusion die head, and the supporting pipe can penetrate through the water inlet and return pipeline.
Of course, as shown in fig. 2, two spiral grooves may be disposed on the surface of the support tube, and the two spiral grooves are distributed at intervals in the circumferential direction of the support tube, the inner end and the outer end of the spiral groove respectively penetrate through the inner end surface and the outer end surface of the support tube, and the two spiral grooves are communicated with each other near the inner end surface of the support tube through the transition groove 23. Therefore, the heating element can be embedded in the first spiral groove from the outer end to the inner end of the supporting tube, then the heating element is bent at the inner end of the spiral groove and then embedded in the transition groove, and then the heating element is bent and then embedded in the second spiral groove from inside to outside, so that two control ends of the heating element are both positioned at the outer end of the supporting tube, the arrangement and connection of connecting wires for connecting the heating element and the temperature controller are facilitated, the arrangement density of the heating element on the surface of the supporting tube is increased, and the uniform heating of the heating element is facilitated.
Similarly, a spiral guide groove 24 can be arranged on the outer side wall of the support tube, one end of the guide groove penetrates through the outer end face of the support tube, the other end of the guide groove is communicated with the accommodating groove, and a connecting lead for connecting the temperature control element and the temperature controller is arranged in the guide groove. Preferably, the pitch of the guide groove should be equal to the pitch of the helical groove, and the two helical grooves are evenly distributed in the circumferential direction of the support tube. The guide groove is arranged between the two spiral grooves, and the distance between the guide groove and the two spiral grooves is equal.
Preferably, the heating element can adopt a glass fiber heating tape, so that the heating element has good insulating property and high temperature resistance, and can be conveniently bent and wound on the surface of the support tube.
In addition, the Teflon high-temperature adhesive tape can be wound on the outer side of the supporting tube, so that the heating element and the temperature control element are equal to the supporting tube to form a whole, the supporting tube can be conveniently inserted into a central channel of the extrusion die head, and the high-temperature resistant Teflon high-temperature adhesive tape can form better insulation protection and fixation on the heating element and prevent the heating element from being separated from a spiral groove of the supporting tube.
As an alternative to Teflon high temperature adhesive tape, as shown in FIG. 3, a limiting groove 12 corresponding to the spiral groove may be provided on the inner sidewall of the central passage of the extrusion die, that is, the limiting groove and the spiral groove are combined together to form a spiral passage. The spacing inslot inlays and is equipped with elastic insulated strip 6, and the degree of depth that highly is greater than the spacing groove of this insulated strip to make the insulated strip exceed the inboard spacing at the helicla flute of spacing groove, the inboard of insulated strip supports the heating element who presses the helicla flute at this moment, makes heating element reliable positioning, and be favorable to improving heating element's insulating properties, because the inside and outside both sides of insulated strip cross over respectively at helicla flute and spacing inslot, consequently be favorable to making reliable axial positioning form between stay tube and the extrusion die head.
Further, the insulation strip can be installed in the limiting groove by the following method:
a. processing two spiral grooves and a transition groove on the outer side wall of the supporting tube, wherein the two spiral grooves are distributed at intervals in the circumferential direction of the supporting tube, and the transition groove is arranged between the spiral grooves close to the inner end surface of the supporting tube, preferably, the transition groove is semicircular, so that two ends of the transition groove are respectively in smooth transition connection with the spiral grooves;
b. the insulation bar made of silicone rubber is produced by molding, and as shown in fig. 4, the insulation bar comprises two helical crimp bars 61 and a transition bar 62 integrally connected between the ends of the two crimp bars, and the pitch diameter of the crimp bars is smaller than the pitch diameter of the spiral groove, preferably, the pitch diameter of the crimp bars is one half to three quarters of the pitch diameter of the spiral groove. In addition, the height of the crimping strip should be greater than the depth of the limiting groove, and preferably, the height of the crimping strip plus the thickness of the heating element should be equal to the depth of the limiting groove plus the depth of the spiral groove, so that the crimping strip can reliably press the heating element in the spiral groove;
c. embedding the heating element in the first spiral groove, bending the heating element, embedding the bent heating element in the transition groove, and bending the heating element and embedding the bent heating element in the second spiral groove;
d. opening a first crimping strip in the insulating strips and embedding the first crimping strip in a first spiral groove from outside to inside, then embedding a transition strip in a transition groove, then opening a second crimping strip in the insulating strips and embedding the second crimping strip in a second spiral groove from inside to outside, wherein the crimping strips shrink to generate elasticity so as to tightly cover the heating element in the spiral groove, and the crimping strips are higher than the spiral groove;
e. the inner end of the supporting tube is aligned to the central channel of the extrusion die head, the crimping strip higher than the outer surface of the supporting tube is aligned to the limiting groove on the central channel, then the supporting tube is axially moved forwards while rotating, and at the moment, the crimping strip on the supporting tube enters the spiral limiting groove. In order to avoid the interference of the transition strip, a notch 621 can be provided on the outer side of the transition strip, so that the height of the transition strip is smaller than that of the crimping strip, so as to ensure that the transition strip is completely sunk in the transition groove;
f. when the supporting tube axially moves forwards and is in place, the outer side of the crimping strip is matched in the limiting groove, the inner side of the crimping strip, which is higher than the limiting groove, is limited in the spiral groove and abuts against the heating element in the spiral groove, and therefore the installation of the insulating strip is completed.
Claims (4)
1. A heating device in an extrusion die head of a double-wall corrugated pipe comprises a strip-shaped heating element and a temperature controller for controlling the temperature of the heating element, and is characterized in that a supporting pipe is inserted in a central channel of the extrusion die head, a water inlet and return pipeline is arranged in the supporting pipe in a penetrating manner, the outer side wall of the supporting pipe is provided with a containing groove and at least one spiral groove, the outer end of the spiral groove penetrates through the outer end face of the supporting pipe outside the central channel, the heating element is embedded in the spiral groove, a temperature control element is embedded in the containing groove, the heating element and the temperature control element are respectively and electrically connected with the temperature controller, the cross section of the spiral groove is rectangular, a limiting groove corresponding to the spiral groove is arranged on the inner side wall of the central channel of the extrusion die head, an elastic insulating strip is embedded in the limiting groove, the height of the insulating strip is greater than the depth of the, the insulating strip is arranged in the limiting groove by the following method:
a. processing two spiral grooves and a transition groove on the outer side wall of the supporting tube, wherein the two spiral grooves are distributed at intervals in the circumferential direction of the supporting tube, the transition groove is arranged between the spiral grooves close to the inner end face of the supporting tube, and the two ends of the transition groove are in smooth transition connection with the spiral grooves;
b. molding and forming an insulating strip made of silicon rubber, wherein the insulating strip comprises two spiral crimping strips and a transition strip connected between the two crimping strips, the pitch diameter of the crimping strips is one half to three quarters of the pitch diameter of the spiral groove, the height of the crimping strips is greater than the depth of the limiting groove, and notches are formed in the outer sides of the transition strips, so that the height of the transition strips is smaller than that of the crimping strips;
c. embedding the heating element in the first spiral groove, bending and embedding the heating element in the transition groove, and bending and embedding the heating element in the second spiral groove;
d. opening a first crimping strip in the insulating strips and embedding the first crimping strip in a first spiral groove, then embedding a transition strip in a transition groove, then opening a second crimping strip in the insulating strips and embedding the second crimping strip in a second spiral groove, and by means of the elasticity of the insulating strips, the insulating strips shrink and tightly cover the heating element, and the crimping strips are higher than the spiral grooves, and the transition strips are sunk in the transition groove;
e. aligning the supporting tube with the central channel of the extrusion die head, aligning the crimping strip higher than the outer surface of the supporting tube with the limiting groove on the central channel, then rotating and axially moving the supporting tube forwards, and enabling the crimping strip on the supporting tube to enter the limiting groove at the moment;
f. when the supporting tube axially moves forwards and is in place, the outer side of the crimping strip is matched in the limiting groove, the inner side of the crimping strip, which is higher than the limiting groove, is limited in the spiral groove and abuts against the heating element in the spiral groove, and therefore the installation of the insulating strip is completed.
2. The heating device of claim 1, wherein the number of the spiral grooves is 2, and the spiral grooves are distributed at intervals in the circumferential direction of the support tube, the inner end and the outer end of each spiral groove respectively penetrate through the inner end surface and the outer end surface of the support tube, the 2 spiral grooves are communicated with each other near the inner end surface of the support tube through transition grooves, the accommodating groove is located at a middle position in the length direction of the central passage, a spiral guide groove is further arranged on the outer side wall of the support tube, one end of the guide groove penetrates through the outer end surface of the support tube, the other end of the guide groove is communicated with the accommodating groove, and a connecting wire for connecting the temperature control element and the.
3. The heating apparatus of claim 1, wherein the heating element is a fiberglass heating tape.
4. The heating device in an extrusion die head for double-wall corrugated pipes as claimed in claim 1, wherein a Teflon high-temperature adhesive tape is wound on the outer side of the support tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810005424.5A CN108297377B (en) | 2018-01-03 | 2018-01-03 | Heating device in double-wall corrugated pipe extrusion die head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810005424.5A CN108297377B (en) | 2018-01-03 | 2018-01-03 | Heating device in double-wall corrugated pipe extrusion die head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108297377A CN108297377A (en) | 2018-07-20 |
| CN108297377B true CN108297377B (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810005424.5A Active CN108297377B (en) | 2018-01-03 | 2018-01-03 | Heating device in double-wall corrugated pipe extrusion die head |
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| Country | Link |
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| CN (1) | CN108297377B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56120012A (en) * | 1980-02-27 | 1981-09-21 | Fujikura Ltd | Method of manufacturing crosslinked insulated cable |
| CN1586866A (en) * | 2004-09-28 | 2005-03-02 | 杭州波达塑业有限公司 | Process for producing large caliber hard polyvinyl chloride double wall corrugated pipe |
| CN205364281U (en) * | 2016-01-18 | 2016-07-06 | 东莞市众一新材料科技有限公司 | A granulator for producing nylon materials |
| WO2017078999A1 (en) * | 2015-11-04 | 2017-05-11 | Te Connectivity Corporation | Extruder for use in an additive manufacturing process |
| CN207983947U (en) * | 2018-01-03 | 2018-10-19 | 浙江双林机械股份有限公司 | Heating structure in a kind of double-wall corrugated pipe extrusion die |
-
2018
- 2018-01-03 CN CN201810005424.5A patent/CN108297377B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56120012A (en) * | 1980-02-27 | 1981-09-21 | Fujikura Ltd | Method of manufacturing crosslinked insulated cable |
| CN1586866A (en) * | 2004-09-28 | 2005-03-02 | 杭州波达塑业有限公司 | Process for producing large caliber hard polyvinyl chloride double wall corrugated pipe |
| WO2017078999A1 (en) * | 2015-11-04 | 2017-05-11 | Te Connectivity Corporation | Extruder for use in an additive manufacturing process |
| CN205364281U (en) * | 2016-01-18 | 2016-07-06 | 东莞市众一新材料科技有限公司 | A granulator for producing nylon materials |
| CN207983947U (en) * | 2018-01-03 | 2018-10-19 | 浙江双林机械股份有限公司 | Heating structure in a kind of double-wall corrugated pipe extrusion die |
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| Publication number | Publication date |
|---|---|
| CN108297377A (en) | 2018-07-20 |
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