Screw heating ring

Abstract

The utility model discloses a screw heating ring, and belongs to the technical field of screw heating devices. Comprising a left semi-circle wrapping heating mechanism and a right semi-circle wrapping heating mechanism which are identical in structure, and the two ends of the left semi-circle wrapping heating mechanism and the two ends of the right semi-circle wrapping heating mechanism are connected to form a complete barrel-shaped body structure. The machine is characterized in that the machine barrel left semicircle wrapping heating mechanism comprises an outer protective plate, an insulating heat-resisting layer, an electric heating wire, a high-heat-conduction insulating layer and a heat transfer plate which are arranged from outside to inside; a first leading-out terminal and a second leading-out terminal of the electric heating wire are located at the same end of the heating mechanism in parallel in the state of being perpendicular to the high-thermal-conductivity insulating layer and sequentially penetrate through the insulating heat-resisting layer and the outer protection plate from inside to outside to extend to the outside, and the middle of the electric heating wire is laid on the side, facing the high-thermal-conductivity insulating layer, of the insulating heat-resisting layer in a bent state. And one side, back to the electric heating wire, of the insulating heat-resistant layer is in contact with the outer protective plate. The utility model has the advantages that: excellent heat conductivity is exerted, and heat on one side back to the machine barrel can be prevented from being dissipated to the outside, so that an excellent energy-saving effect is embodied.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw heating devices, and particularly relates to a screw heating coil. Background Art

[0002] The screw is an important component of a screw extruder. Materials (such as rubber compounds) are heated and plasticized by the extrusion, shearing, and stirring actions of the screw, and finally continuously extruded through the die. The hot-feed screw extruder is an important plastic processing equipment. It advances the plastic raw materials through the rotation and forward movement of the screw. During this process, the plastic raw materials gradually melt under the extrusion pressure of the screw. Since the screw is provided with a heating coil (also called a "heating sleeve"), the temperature of the material increases during movement. This heating process transforms the polymer material from a solid state of particles or powder into a molten fluid state. The molten material is continuously conveyed to the front of the screw, passes through the filter screen and the distribution plate, and enters the head for shaping, so that the polymer melt has a certain shape.

[0003] In the publicly available Chinese patent documents, technical information related to screw heating coils can be found. For example, CN103057092A provides a "screw heating device for a screw extruder", which uses liquid as a medium for jacket heating; CN218053897U recommends a "heating device for a screw extruder". According to the description of the embodiment of this patent, it uses a heating coil located between the housing and the fitting plate to transfer heat to the fitting plate. Since the fitting plate hugs the screw barrel, the fitting plate conducts heat to the screw barrel; CN214294388U introduces a "heating device for a twin-screw extruder". The positive significance of this patent is that it uses the first, second, and third heating wires to adjust the heating temperature by changing the length of the heating wires.

[0004] Not only do the patents exemplified above have the problem of poor heat transfer effect to the screw, which is not conducive to energy saving, but also because there is no measure to block heat dissipation on the side facing away from the screw barrel, that is, the side facing the outside, it is also not conducive to achieving the desired energy-saving effect. Summary of the Utility Model

[0005] The task of the utility model is to provide a screw heating coil that not only helps the side facing the screw to have excellent thermal conductivity but also is conducive to the side facing away from the screw to exhibit good heat blocking from dissipating to the outside, thereby achieving excellent energy-saving effects.

[0006] The task of the present utility model is completed as follows. A screw heating coil includes a heating mechanism wrapped around the left semi-circle of a barrel and a heating mechanism wrapped around the right semi-circle of the barrel. The structures of the heating mechanisms wrapped around the left and right semi-circles of the barrel are the same and their two ends are connected to each other to form a complete cylindrical structure. It is characterized in that the heating mechanism wrapped around the left semi-circle of the barrel includes an outer protection plate, an insulating and heat-resistant layer, an electric heating wire, a high thermal conductivity insulating layer, and a heat transfer plate arranged from outside to inside. Among them, the first lead terminal of the electric heating wire and the second lead terminal of the electric heating wire are parallel to each other perpendicular to the high thermal conductivity insulating layer and are located at the same end of the heating mechanism, and successively pass through the insulating and heat-resistant layer and the outer protection plate from inside to outside and extend to the outside, while the middle part of the electric heating wire is laid in a bent state on the side of the insulating and heat-resistant layer facing the high thermal conductivity insulating layer, and the side of the insulating and heat-resistant layer facing away from the electric heating wire is in contact with the outer protection plate.

[0007] In a specific embodiment of the present utility model, the first lead terminal of the electric heating wire is connected to one end of the electric heating wire through an electrical connection piece of the first lead terminal of the electric heating wire, and the second lead terminal of the electric heating wire is connected to the other end of the electric heating wire through an electrical connection piece of the second lead terminal of the electric heating wire, and the electrical connection pieces of the first and second lead terminals of the electric heating wire correspond to each other front and back.

[0008] In another specific embodiment of the present utility model, the middle part of the electric heating wire refers to the part between the connection point where the electric heating wire is connected to the electrical connection piece of the first lead terminal of the electric heating wire as the starting point and the connection point where the electric heating wire is connected to the electrical connection piece of the second lead terminal of the electric heating wire as the ending point. The middle part of the electric heating wire is laid along the length direction of the side of the insulating and heat-resistant layer facing the high thermal conductivity insulating layer in a continuous cyclic alternating bending manner of one n-shaped and one u-shaped separated from each other, and forms a row or multiple rows that are parallel to each other and spaced apart in the width direction of the insulating and heat-resistant layer.

[0009] In yet another specific embodiment of the present utility model, the middle part of the electric heating wire refers to the part between the connection point where the electric heating wire is connected to the electrical connection piece of the first lead terminal of the electric heating wire as the starting point and the connection point where the electric heating wire is connected to the electrical connection piece of the second lead terminal of the electric heating wire as the ending point. The middle part of the electric heating wire is laid along the length direction of the side of the insulating and heat-resistant layer facing the high thermal conductivity insulating layer in a continuous cyclic repeated bending manner of s-shaped or w-shaped, and forms a row or multiple rows that are parallel to each other and spaced apart in the width direction of the insulating and heat-resistant layer.

[0010] In still another specific embodiment of the present utility model, a heat transfer plate front defining hem with a ┌-shaped cross-sectional shape is formed at the front edge portion in the length direction of the heat transfer plate. A heat transfer plate front embedding groove is formed between the heat transfer plate front defining hem and the outer side of the heat transfer plate facing outward. And a heat transfer plate rear defining hem with a ┐-shaped cross-sectional shape is formed at the rear edge portion in the length direction of the heat transfer plate. The heat transfer plate rear defining hem corresponds to the heat transfer plate front defining hem in an opposite direction. And a heat transfer plate rear embedding groove corresponding to the heat transfer plate front embedding groove is formed between the heat transfer plate rear defining hem and the outer side of the heat transfer plate facing outward. The front edge portion in the length direction of the outer protection plate, the heat insulation layer, and the high thermal conductivity insulation layer is embedded in the heat transfer plate front embedding groove, and the rear edge portion in the length direction is embedded in the heat transfer plate rear embedding groove.

[0011] In still another specific embodiment of the present utility model, a connection strip is welded and fixed at one end of the heat transfer plate and at a position on the right side corresponding to the electrical connection piece of the first lead terminal of the electric heating wire and the electrical connection piece of the second lead terminal of the electric heating wire while corresponding to the first lead terminal of the electric heating wire. One end of the heating mechanism wrapped by the right semi-circle of the barrel facing the connection strip is welded and connected to the connection strip. A group of first connection pin shaft seats are fixedly spaced at the other end of the heat transfer plate, and a group of second connection pin shaft seats are fixedly spaced at one end of the heating mechanism wrapped by the right semi-circle of the barrel facing the group of first connection pin shaft seats. The group of first connection pin shaft seats and the group of second connection pin shaft seats form an interdigitated mating relationship with each other and are connected by a pin shaft.

[0012] In yet another specific embodiment of the present utility model, at one end of the outer protection plate and at a position corresponding to the left side of the first lead terminal of the electric heating wire and the second lead terminal of the electric heating wire, a lead terminal protective cover locking seat is fixed. A protective cover locking screw hole is provided on the lead terminal protective cover locking seat. The right semi-circle of the barrel wrapping the heating mechanism includes an outer sealing plate having the same structure as the outer protection plate. The first connection terminal of the electric heating wire and the second connection terminal of the electric heating wire of the right semi-circle of the barrel wrapping the heating mechanism respectively correspond to the right sides of the first lead terminal of the electric heating wire and the second lead terminal of the electric heating wire. At a position on the outer sealing plate corresponding to the right sides of the first connection terminal of the electric heating wire and the second connection terminal of the electric heating wire, a protective cover hinge plate is fixed. A terminal protective cover for shielding the first lead terminal of the electric heating wire, the second lead terminal of the electric heating wire, the first connection terminal of the electric heating wire, and the second connection terminal of the electric heating wire is hinged on the protective cover hinge plate through a protective cover hinge pin shaft. At one end of the terminal protective cover facing the lead terminal protective cover locking seat, a protective cover fixing plate is formed. A protective cover fixing plate screw for locking or unlocking the terminal protective cover is provided at a position on the protective cover fixing plate corresponding to the protective cover locking screw hole. When the protective cover fixing plate screw is locked with the protective cover locking screw hole, the first and second lead terminals of the electric heating wire, the first connection terminal of the electric heating wire, and the second connection terminal of the electric heating wire are located in the terminal protective cover cavity of the terminal protective cover, and an external power source is introduced through a power cord inlet hole provided on the terminal protective cover.

[0013] In a further specific embodiment of the present utility model, the heat transfer plate is made of a stainless steel plate, a copper plate, or an aluminum alloy plate with a thickness of 0.5 - 1 mm; the electric heating wire is a flat nickel-chromium alloy electric heating wire with a rectangular cross-sectional shape.

[0014] In yet another further specific embodiment of the present utility model, the outer protection plate and the outer sealing plate are metal plates. Electric heating wire first lead terminal insulating sleeves and electric heating wire second lead terminal insulating sleeves are respectively provided at positions corresponding to the outer protection plate for the first lead terminal of the electric heating wire and the second lead terminal of the electric heating wire. Electric heating wire first connection terminal insulating sleeves and electric heating wire second connection terminal insulating sleeves are respectively provided at positions corresponding to the outer sealing plate for the first connection terminal of the electric heating wire and the second connection terminal of the electric heating wire.

[0015] In yet another further specific embodiment of the present utility model, the thickness of the high thermal conductivity insulating layer is 0.8 - 1.6 mm, and the thickness of the insulating heat-resistant layer is 2 to 3 times the thickness of the high thermal conductivity insulating layer; the high thermal conductivity insulating layer is a magnesium oxide layer or an aluminum nitride layer; the insulating heat-resistant layer is a mica layer or a glass fiber layer.

[0016] The technical effect of the technical solution provided by the present utility model lies in: due to the use of a high thermal conductivity insulating layer and an insulating heat-resistant layer, and the curved state of the middle part of the electric heating wire is laid on the side of the insulating heat-resistant layer facing the high thermal conductivity insulating layer, and the side of the insulating heat-resistant layer facing away from the electric heating wire is in contact with the outer protection plate, thus in the use state, when the left and right semi-circular barrel-wrapping heating mechanisms are wrapped around the barrel of the screw extruder, not only can excellent thermal conductivity be exerted, but also the side facing away from the barrel can prevent heat from dissipating to the outside and thus exhibit excellent energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 the installation schematic diagram of the terminal protection cover shown;

[0019] Figure 3 is Figure 1 the enlarged view of part A of

[0020] Figure 4 is Figure 1 the enlarged view of part B of

[0021] Figure 5 is Figure 1 the detailed structural diagram of the outer protection plate and the heat transfer plate shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to be able to more clearly understand the technical essence and beneficial effects of the present utility model, the applicant will make a detailed description below in the form of embodiments, but the descriptions of the embodiments are not limitations on the technical solution of the present utility model, and any formal but non-substantive equivalent transformation made based on the concept of the present utility model should be regarded as falling within the scope of the technical solution of the present utility model.

[0023] In the following descriptions, all concepts related to directions or orientations such as up, down, left, right, front and back are based on Figure 1 the position state shown, and thus cannot be understood as special limitations on the technical solution provided by the present utility model.

[0024] Please refer to Figure 1 and Figure 2 , which show a left semi-circular barrel-wrapping heating mechanism 1 and a right semi-circular barrel-wrapping heating mechanism 2 of a barrel. The structures of the left and right semi-circular barrel-wrapping heating mechanisms 1 and 2 of the barrel are the same and their two ends are connected to each other to form a complete cylindrical structure. Since the structure of the right semi-circular barrel-wrapping heating mechanism 2 of the barrel is the same as that of the left semi-circular barrel-wrapping heating mechanism 1 of the barrel, the applicant will only make a detailed description of the left semi-circular barrel-wrapping heating mechanism 1 of the barrel below.

[0025] The aforementioned left semi-circular barrel wrapping heating mechanism 1 includes an outer protection plate 11, an insulating heat-resistant layer 12, an electric heating wire 13, a highly heat-conductive insulating layer 14, and a heat transfer plate 15 arranged from outside to inside. Among them, the first lead terminal 131 and the second lead terminal 132 of the electric heating wire 13 are parallel to each other perpendicular to the highly heat-conductive insulating layer 14 and are located at the same end of the aforementioned heating mechanism 1, and sequentially pass through the insulating heat-resistant layer 12 and the outer protection plate 11 from inside to outside (forming insulation at the corresponding position of the outer protection plate 11) and extend to the outside world. The middle part of the electric heating wire 13 is laid in a bent state on the side of the aforementioned insulating heat-resistant layer 12 facing the highly heat-conductive insulating layer 14, and the side of the insulating heat-resistant layer 12 facing away from the electric heating wire 13 is in contact with the aforementioned outer protection plate 11.

[0026] As shown by Figure 1 the figure, the aforementioned first lead terminal 131 of the electric heating wire is connected to one end of the aforementioned electric heating wire 13 through the first lead terminal electrical connection piece 1311 of the electric heating wire, and the aforementioned second lead terminal 132 of the electric heating wire is connected to the other end of the electric heating wire 3 through the second lead terminal electrical connection piece 1321 of the electric heating wire. The first and second lead terminal electrical connection pieces 1311 and 1321 of the electric heating wire correspond to each other front and back.

[0027] The applicant needs to explain that: According to professional common sense, since the outer diameter of the barrel of the screw extruder, the length of each temperature zone, etc. are related to factors such as the material to be extruded and process elements, etc., in this embodiment, it is not necessary to particularly limit the length and / or unfolded width of the left and right semi-circular barrel wrapping heating mechanisms 1 and 2 of the barrel. For example, it is not necessary to particularly limit the radius and length of the heat transfer plate 15.

[0028] In this embodiment, the middle part of the aforementioned electric heating wire 13 refers to the part between the connection point where the electric heating wire 13 is connected to the first lead terminal electrical connection piece 1311 of the electric heating wire as the starting point and the connection point where it is connected to the second lead terminal electrical connection piece 1321 of the electric heating wire as the end point. The middle part of the electric heating wire 13 is laid along the length direction of the side of the aforementioned insulating heat-resistant layer 12 facing the highly heat-conductive insulating layer 14 in a continuous cyclic alternating bending manner with n-shaped and u-shaped parts alternating one by one, and forms multiple rows that are both parallel to each other and spaced apart in the width direction of the insulating heat-resistant layer 12. The aforementioned multiple rows refer to two or more rows. In this embodiment, six rows that are both parallel to each other and spaced apart are formed.

[0029] As another implementation manner, the middle part of the electric heating wire 13 can also be laid along the length direction of the side of the insulating heat-resistant layer 12 facing the highly heat-conductive insulating layer 14 in a continuous cyclic alternating bending manner with n-shaped and u-shaped parts alternating one by one, and form one row in the width direction of the insulating heat-resistant layer 12.

[0030] As another embodiment, the concept of the middle part of the aforementioned electric heating wire 13 is the same as described above, that is, the middle part of the electric heating wire 13 refers to the part between the connection point where the electric heating wire 13 is electrically connected to the aforementioned first lead terminal electrical connection piece 1311 of the electric heating wire as the starting point and the connection point where it is electrically connected to the aforementioned second lead terminal electrical connection piece 1321 of the electric heating wire as the end point. The middle part of the electric heating wire 13 is laid along the length direction of the aforementioned insulating and heat-resistant layer 12 towards the side of the aforementioned high thermal conductivity insulating layer 14 in an s-shaped or w-shaped continuous cyclic bending manner and forms a single row or multiple rows that are parallel to each other and spaced apart from each other in the width direction of the insulating and heat-resistant layer 12. The so-called multiple rows also means two or more rows.

[0031] Above, although the applicant has exemplified the bending methods of the electric heating wire 13 as: continuous cyclic alternation of u-shaped and n-shaped at intervals, s-shaped continuous cyclic repetition, and w-shaped continuous cyclic repetition, it does not mean excluding other bending methods of the electric heating wire 13 that are not mentioned.

[0032] Please refer to Figure 3 and Figure 5 And in combination with Figure 1 and Figure 2 , at the front edge part in the length direction of the aforementioned heat transfer plate 15, there is formed a heat transfer plate front limiting fold 151 with a ┌-shaped cross-sectional shape. A heat transfer plate front embedding groove 1511 is formed between the heat transfer plate front limiting fold 151 and the outward-facing side of the heat transfer plate 15. And at the rear edge part in the length direction of the heat transfer plate 15, there is formed a heat transfer plate rear limiting fold 152 with a ┐-shaped cross-sectional shape. The heat transfer plate rear limiting fold 152 corresponds to the aforementioned heat transfer plate front limiting fold 151, and a heat transfer plate rear embedding groove 1521 corresponding to the aforementioned heat transfer plate front embedding groove 1511 is formed between the heat transfer plate rear limiting fold 152 and the outward-facing side of the heat transfer plate 15. The front edge part in the length direction of the aforementioned outer protection plate 11, insulating and heat-resistant layer 12, and high thermal conductivity insulating layer 14 is embedded in the heat transfer plate front embedding groove 1511, and the rear edge part in the length direction is embedded in the heat transfer plate rear embedding groove 1521. In Figure 5 shows the outer protection plate arc cavity 112, which can also be called the outer arc plate semi-circular cavity. The aforementioned insulating and heat-resistant layer 12 is in contact (abutting) with the cavity wall of the outer protection plate arc cavity 112.

[0033] Continue to refer to Figures 1 to 3, at one end of the aforementioned heat transfer plate 15 and at a position on the right side corresponding to the first lead electrical connection piece 1311 of the electric heating wire corresponding to the first lead terminal 131 of the electric heating wire and the second lead electrical connection piece 1321 of the second lead terminal 132 of the electric heating wire, a connecting strip 153 is fixedly welded. One end of the heating mechanism 2 wrapped by the right semi-circle of the aforementioned barrel facing the connecting strip 153 is welded and connected to the connecting strip 153.

[0034] Please refer to Figure 4 And continue to combine with Figure 1 and Figure 2 , at the other end of the heat transfer plate 15, a set of first connecting pin shaft seats 154 are fixedly spaced. And at one end of the heating mechanism 2 wrapped by the right semi-circle of the aforementioned barrel facing the set of first connecting pin shaft seats 154, a set of second connecting pin shaft seats 21 are fixedly spaced. The set of first connecting pin shaft seats 154 and the set of second connecting pin shaft seats 21 form an interdigitated (also called "jagged") mating relationship with each other and are connected by a pin shaft not shown in the figure.

[0035] Please pay special attention to Figure 1 and Figure 2, at one end of the aforementioned outer protection plate 11 and at a position corresponding to the left side of the first lead terminal 131 and the second lead terminal 132 of the aforementioned electric heating wire, a lead terminal protective cover locking seat 111 is fixed. A protective cover locking screw hole 1111 is provided on the lead terminal protective cover locking seat 111. The right semi-cylindrical wrapping heating mechanism 2 of the machine barrel includes an outer sealing plate 22 having the same structure as the aforementioned outer protection plate 11. The first electric heating wire terminal 23 and the second electric heating wire terminal 24 of the right semi-cylindrical wrapping heating mechanism 2 of the machine barrel correspond to the right sides of the first lead terminal 131 and the second lead terminal 132 of the electric heating wire respectively. At a position on the aforementioned outer sealing plate 22 corresponding to the right sides of the first electric heating wire terminal 23 and the second electric heating wire terminal 24, a protective cover hinge plate 221 is fixed. A terminal protective cover 3 for shielding the first lead terminal 131, the second lead terminal 132, the first electric heating wire terminal 23, and the second electric heating wire terminal 24 of the electric heating wire is hinged on the protective cover hinge plate 221 through a protective cover hinge pin 2211. At one end of the terminal protective cover 3 facing the aforementioned lead terminal protective cover locking seat 111, a protective cover fixing plate 31 is formed. At a position on the protective cover fixing plate 31 corresponding to the aforementioned protective cover locking screw hole 1111, a protective cover fixing plate screw 311 for locking or unlocking the terminal protective cover 3 is provided. When the protective cover fixing plate screw 311 is locked with the protective cover locking screw hole 1111, the first and second lead terminals 131, 132 of the electric heating wire, the first electric heating wire terminal 23, and the second electric heating wire terminal 24 are located in the terminal protective cover cavity 32 of the terminal protective cover 3. The external power supply is introduced through a power cord inlet hole 33 provided on the terminal protective cover 3.

[0036] The thickness of the aforementioned heat transfer plate 15 is preferably made of a stainless steel plate with a thickness of 0.5 - 1 mm, more preferably 0.7 - 0.9 mm, and most preferably 0.8 mm. However, it can also be made of a copper plate, an aluminum alloy plate, or other metal plates with equivalent materials; the aforementioned electric heating wire 13 is a flat nickel-chromium alloy electric heating wire with a rectangular cross-sectional shape (i.e., a rectangular cross-section).

[0037] The aforementioned outer protection plate 11 and the aforementioned outer sealing plate 22 are metal plates. Electric heating wire first lead terminal insulating sleeves 1312 and electric heating wire second lead terminal insulating sleeves 1322 are respectively provided at positions corresponding to the outer protection plate 11 for the first lead terminal 131 and the second lead terminal 132 of the electric heating wire. Electric heating wire first wiring terminal insulating sleeves 231 and electric heating wire second wiring terminal insulating sleeves 241 are respectively provided at positions corresponding to the aforementioned outer sealing plate 22 for the first electric heating wire terminal 23 and the second electric heating wire terminal 24.

[0038] In this embodiment, the thickness of the aforementioned high thermal conductivity insulating layer 14 is preferably 0.8 - 1.6 mm, more preferably 1 - 1.4 mm, and most preferably 1.2 mm. In this embodiment, the thickness is 1.2 mm. The thickness of the aforementioned heat insulating layer 12 is preferably 1.6 mm, and most preferably 2.4 mm. In this embodiment, 2.4 mm is selected, and of course 3.2 mm can also be selected. In this embodiment, the aforementioned high thermal conductivity insulating layer 14 is a magnesium oxide layer, but it can also be an aluminum nitride layer or other equivalent materials. In this embodiment, the aforementioned heat insulating layer 12 is a mica layer, but it can also be a glass fiber layer or other equivalent heat insulating layer materials.

[0039] According to professional common sense, when the first lead terminal 131 of the electric heating wire and the first wiring terminal 23 of the electric heating wire are used as the power supply positive connection terminals, then the second lead terminal 132 of the electric heating wire and the second wiring terminal 24 of the electric heating wire are used as the power supply negative connection terminals, and vice versa, so as to form a power supply circuit.

[0040] When using the present utility model, the heat transfer plate 15 of the structural system that wraps the left semi-circle of the barrel of the heating mechanism 1 and the heat transfer plate 25 of the structural system that wraps the right semi-circle of the barrel of the heating mechanism 2 are clamped to the barrel of the screw extruder in a face-to-face manner, and the first and second connecting pin seats 154 and 21 are connected by the aforementioned pin shafts, so that the present utility model forms a complete cylindrical structure. When the electric heating wire 13 is energized, the heat generated by the electric heating wire 13 heats the heat transfer plate 15 through the high thermal conductivity insulating layer 14 (in a heating mode of heat transfer accompanied by heat radiation), and then the heated heat transfer plate 15 transfers the heat to the barrel of the screw extruder, thereby playing a role in heating and melting the materials in the barrel of the screw extruder. In the aforementioned process, the heat insulating layer 12 on the side opposite to the high thermal conductivity insulating layer 14 can play a good heat insulation role, thereby reflecting an excellent energy-saving effect. Comparative experiments conducted by the applicant show that compared with the prior art such as a single electric heating wire structure, the structure of the present application can save about 36% to 40% of energy, which is indeed an excellent technical solution.

[0041] In summary, the technical solution provided by the present utility model makes up for the deficiencies in the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. A screw heating coil, comprising a left semi-cylindrical barrel wrapping heating mechanism (1) and a right semi-cylindrical barrel wrapping heating mechanism (2). The structures of the left semi-cylindrical barrel wrapping heating mechanism (1) and the right semi-cylindrical barrel wrapping heating mechanism (2) are the same and their two ends are connected to each other to form a complete cylindrical structure, characterized in that: The left semi-circular barrel wrapping heating mechanism (1) includes an outer protection plate (11), a heat insulation layer (12), an electric heating wire (13), a high thermal conductivity insulation layer (14), and a heat transfer plate (15) arranged from outside to inside. Among them, the first lead terminal (131) and the second lead terminal (132) of the electric heating wire (13) are parallel to each other perpendicular to the high thermal conductivity insulation layer (14) and are located at the same end of the left semi-circular barrel wrapping heating mechanism (1) of the barrel, and sequentially pass through the heat insulation layer (12) and the outer protection plate (11) from inside to outside and extend to the outside. The middle part of the electric heating wire (13) is laid in a bent state on the side of the heat insulation layer (12) facing the high thermal conductivity insulation layer (14), and the side of the heat insulation layer (12) facing away from the electric heating wire (13) is in contact with the outer protection plate (11).

2. The screw heating coil according to claim 1, wherein: The first lead terminal (131) of the electric heating wire is connected to one end of the electric heating wire (13) through the first lead terminal electrical connection piece (1311) of the electric heating wire, and the second lead terminal (132) of the electric heating wire is connected to the other end of the electric heating wire (13) through the second lead terminal electrical connection piece (1321) of the electric heating wire. The first lead terminal electrical connection piece (1311) and the second lead terminal electrical connection piece (1321) correspond to each other front and back.

3. The screw heating coil according to claim 2, wherein: The middle part of the electric heating wire (13) refers to the part between the connection point where the electric heating wire (13) is connected to the first lead terminal electrical connection piece (1311) of the electric heating wire as the starting point and the connection point where it is connected to the second lead terminal electrical connection piece (1321) of the electric heating wire as the end point. The middle part of the electric heating wire (13) is laid along the length direction of the side of the heat insulation layer (12) facing the high thermal conductivity insulation layer (14) in a continuous cyclic alternating bending manner with an n-shape and a u-shape alternating one by one, and forms a column in the width direction of the heat insulation layer (12) or forms multiple columns that are parallel to each other and spaced apart from each other.

4. The screw heating coil according to claim 2, characterized in that: The middle part of the electric heating wire (13) refers to the part between the connection point where the electric heating wire (13) is connected to the first lead terminal electrical connection piece (1311) of the electric heating wire as the starting point and the connection point where it is connected to the second lead terminal electrical connection piece (1321) of the electric heating wire as the end point. The middle part of the electric heating wire (13) is laid along the length direction of the side of the heat insulation layer (12) facing the high thermal conductivity insulation layer (14) in a continuous cyclic repeated bending manner in an s-shape or a w-shape, and forms a column in the width direction of the heat insulation layer (12) or forms multiple columns that are parallel to each other and spaced apart from each other.

5. The screw heating coil according to claim 1, characterized in that: At the front edge part in the length direction of the heat transfer plate (15), a heat transfer plate front defining flange (151) with a ┌-shaped cross-section is formed. A heat transfer plate front embedding groove (1511) is formed between the heat transfer plate front defining flange (151) and the outward-facing side of the heat transfer plate (15). At the rear edge part in the length direction of the heat transfer plate (15), a heat transfer plate rear defining flange (152) with a ┐-shaped cross-section is formed. The heat transfer plate rear defining flange (152) corresponds to the heat transfer plate front defining flange (151) in an opposite direction. And a heat transfer plate rear embedding groove (1521) corresponding to the heat transfer plate front embedding groove (1511) is formed between the heat transfer plate rear defining flange (152) and the outward-facing side of the heat transfer plate (15). The front edge part in the length direction of the outer protection plate (11), the heat insulation layer (12), and the high thermal conductivity insulation layer (14) is embedded in the heat transfer plate front embedding groove (1511), and the rear edge part in the length direction is embedded in the heat transfer plate rear embedding groove (1521).

6. The screw heating coil according to claim 1, characterized in that: At one end of the heat transfer plate (15) and at a position on the right side corresponding to the first electrical connection piece (1311) of the first lead terminal of the electric heating wire and the second electrical connection piece (1321) of the second lead terminal of the electric heating wire, a connecting bar (153) is welded and fixed. One end of the machine barrel right semi-circular wrapping heating mechanism (2) facing the connecting bar (153) is welded and connected to the connecting bar (153). At the other end of the heat transfer plate (15), a group of first connecting pin shaft seats (154) are fixedly spaced. And at one end of the machine barrel right semi-circular wrapping heating mechanism (2) facing the group of first connecting pin shaft seats (154), a group of second connecting pin shaft seats (21) are fixedly spaced. The group of first connecting pin shaft seats (154) and the group of second connecting pin shaft seats (21) form an interdigitated mating relationship with each other and are connected by a pin shaft.

7. The screw heating coil according to claim 1, wherein: At one end of the outer guard plate (11) and at a position corresponding to the left side of the first lead terminal (131) and the second lead terminal (132) of the electric heating wire, a lead terminal protective cover locking seat (111) is fixed. A protective cover locking screw hole (1111) is formed in the lead terminal protective cover locking seat (111). The right semi-circle of the barrel wrapping the heating mechanism (2) includes an outer sealing plate (22) having the same structure as the outer guard plate (11). The first connection terminal (23) and the second connection terminal (24) of the electric heating wire of the right semi-circle of the barrel wrapping the heating mechanism (2) respectively correspond to the right sides of the first lead terminal (131) and the second lead terminal (132) of the electric heating wire. At a position on the outer sealing plate (22) corresponding to the right sides of the first connection terminal (23) and the second connection terminal (24) of the electric heating wire, a protective cover hinge plate (221) is fixed. A terminal protective cover (3) for shielding the first lead terminal (131), the second lead terminal (132), the first connection terminal (23) and the second connection terminal (24) of the electric heating wire is hinged on the protective cover hinge plate (221) through a protective cover hinge pin (2211). At one end of the terminal protective cover (3) facing the lead terminal protective cover locking seat (111), a protective cover fixing plate (31) is formed. At a position on the protective cover fixing plate (31) corresponding to the protective cover locking screw hole (1111), a protective cover fixing plate screw (311) for locking or unlocking the terminal protective cover (3) is provided. When the protective cover fixing plate screw (311) is locked with the protective cover locking screw hole (1111), the first lead terminal (131), the second lead terminal (132), the first connection terminal (23) and the second connection terminal (24) of the electric heating wire are located in the terminal protective cover cavity (32) of the terminal protective cover (3). The external power supply is introduced through a power cord inlet hole (33) formed in the terminal protective cover (3).

8. The screw heating coil according to claim 1 or 2 or 3, characterized in that: The heat transfer plate (15) is made of a stainless steel plate, a copper plate or an aluminum alloy plate with a thickness of 0.5 - 1 mm; the electric heating wire (13) is a flat nickel-chromium alloy electric heating wire with a rectangular cross-sectional shape.

9. The screw heating coil according to claim 7, wherein: The outer guard plate (11) and the outer sealing plate (22) are metal plates. At positions corresponding to the outer guard plate (11), a first lead terminal insulating sleeve (1312) and a second lead terminal insulating sleeve (1322) are respectively provided for the first lead terminal (131) and the second lead terminal (132) of the electric heating wire. At positions corresponding to the outer sealing plate (22), a first connection terminal insulating sleeve (231) and a second connection terminal insulating sleeve (241) are respectively provided for the first connection terminal (23) and the second connection terminal (24) of the electric heating wire.

10. The screw heating coil according to claim 1, wherein: The thickness of the high thermal conductivity insulating layer (14) is 0.8 - 1.6 mm, and the thickness of the insulating and heat-resistant layer (12) is 2 to 3 times the thickness of the high thermal conductivity insulating layer (14); the high thermal conductivity insulating layer (14) is a magnesium oxide layer or an aluminum nitride layer; the insulating and heat-resistant layer (12) is a mica layer or a glass fiber layer.

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