Heating assembly

Abstract

A heating assembly for heating a tube and including an assembly cylinder, a coil spacer, and a coil assembly. The assembly cylinder has an outer surface and a mounting groove. The mounting groove is recessed radially inward from the outer surface. The assembly cylinder is for surrounding the tube. The coil spacer is disposed in the mounting groove. The coil assembly is disposed in the mounting groove along the coil spacer and for heating the tube.

Description

Technical Field

[0001] This invention relates to a heating assembly, and more particularly to a heating assembly for heating a feed tube. Background Technology

[0002] For example, injection molding equipment requires a heater to heat the plastic in the feed tube so that it can be injected in a molten state. In recent years, coil heaters have gradually replaced traditional resistance heaters or infrared heaters due to their higher heating efficiency.

[0003] However, if a coil heater is used, the coil needs to be wound turn by turn on the assembly cylinder before it can be installed into the feed tube. This results in a considerable amount of assembly time when assembling the coil heater into the feed tube. Summary of the Invention

[0004] The present invention provides a heating assembly comprising an assembly cylinder having a mounting groove to save time in assembling a coil assembly into the assembly cylinder.

[0005] An embodiment of the present invention discloses a heating assembly for heating a feed tube and includes an assembly cylinder, a coil isolator, and a coil assembly. The assembly cylinder has an outer surface and a mounting groove. The mounting groove is radially recessed inward from the outer surface. The assembly cylinder surrounds the feed tube. The coil isolator is disposed in the mounting groove. The coil assembly is disposed along the coil isolator in the mounting groove and is used to heat the feed tube. The assembly cylinder includes a first assembly portion and a second assembly portion. The first assembly portion and the second assembly portion are arranged in the circumferential direction of the assembly cylinder and are detachably assembled with each other. The first assembly portion and the second assembly portion together constitute the outer surface and the mounting groove. The coil isolator includes a first isolator portion and a second isolator portion. The first isolator portion and the second isolator portion are respectively disposed in the first assembly portion and the second assembly portion. The first isolator portion and the second isolator portion are arranged in the circumferential direction of the assembly cylinder and are detachably assembled with each other.

[0006] According to the heating assembly disclosed in the above embodiments, the assembly cylinder has a mounting groove that is radially recessed inward from its outer surface, and both the assembly cylinder and the coil isolator adopt a multi-piece design arranged in the circumferential direction (i.e., the assembly cylinder includes a first assembly portion and a second assembly portion arranged in the circumferential direction, and the coil isolator includes a first isolation portion and a second isolation portion arranged in the circumferential direction). Therefore, the coil assembly can be installed into the mounting groove in one go along the coil isolator, without having to be installed into the assembly cylinder by winding it turn by turn. In this way, the time for assembling the coil assembly into the assembly cylinder can be saved, thereby saving the time for assembling the heating assembly into the feed tube. Attached Figure Description

[0007] Figure 1This is a perspective view of a heating assembly according to a first embodiment of the present invention.

[0008] Figure 2 For along Figure 1 A partially enlarged view of the side section diagram of the heating assembly shown by the sectional line 2-2 in the figure.

[0009] Figure 3 for Figure 1 The front view of the heating components assembled into the feed tube.

[0010] Figure 4 and Figure 5 for Figure 1 An exploded perspective view of the coil isolator and assembly cylinder of the heating component.

[0011] Figure 6 for Figure 1 An exploded three-dimensional view of the assembly cylinder and thermal insulation support of the heating component.

[0012] Figure 7 for Figure 1 A partially enlarged exploded view of the three-dimensional exploded view of the assembly cylinder and mounting cylinder of the heating component.

[0013] Figure 8 For along Figure 2 A partially enlarged view of the side cross-sectional schematic diagram of the heating component.

[0014] Figure 9 This is a perspective view of a heating assembly according to a second embodiment of the present invention.

[0015] Figure 10 For along Figure 9 A partially enlarged view of the side section diagram of the heating assembly shown by section line 10-10 in the figure.

[0016] Figure 11 for Figure 9 A front view of the heating component.

[0017] Explanation of reference numerals in the attached figures:

[0018] 10, 10a: Heating components

[0019] 100: Assembly Cylinder

[0020] 101: Outer surface

[0021] 102: Mounting slot

[0022] 103: First outer surface

[0023] 104: Second outer surface

[0024] 105: First mounting slot

[0025] 106: Second mounting slot

[0026] 107: Inner surface

[0027] 108: First inner surface

[0028] 109: Second inner surface

[0029] 110: First Assembly Department

[0030] 111: First snap-fit ​​structure

[0031] 120: Second Assembly Section

[0032] 121: Second snap-fit ​​structure

[0033] 130: First sliding structure

[0034] 200: Coil Isolator

[0035] 210: First Isolation Department

[0036] 2101: Outer surface

[0037] 211: Third buckle structure

[0038] 220: Second Isolation Department

[0039] 240: Outer convex strip

[0040] 2400: Fixed side

[0041] 2401: Buckle side

[0042] 241: Card bump

[0043] 242: Guide ramp

[0044] 250: Coil Assembly

[0045] 300: Thermal insulation support component

[0046] 310: Second sliding structure

[0047] 320: piercing

[0048] 400, 400a: Mounting cylinder

[0049] 410: First Installation Department

[0050] 411:Inner convex strip

[0051] 412: Locking slot

[0052] 420: Second Installation Section

[0053] 430, 430a: Engagement hole

[0054] 431a: First engagement hole

[0055] 432a: Second engagement hole

[0056] 500, 500a: Magnet

[0057] 510, 531a: First plate section

[0058] 520, 532a: Second plate section

[0059] 530a: First magnet

[0060] 540a: Second magnet

[0061] 20: Material pipe

[0062] 30: Insulation sleeve

[0063] C: Circumferential direction

[0064] A: Axial direction

[0065] E1: Extension direction

[0066] W: Width Detailed Implementation

[0067] The following detailed description of the embodiments of the present invention outlines its features and advantages, sufficient to enable any person skilled in the art to understand the technical content of the embodiments and implement them accordingly. Furthermore, based on the disclosures, claims, and drawings in this specification, any person skilled in the art can easily understand the related objectives and advantages of the present invention. The following embodiments further illustrate the viewpoints of the present invention in detail, but are not intended to limit the scope of the invention in any way.

[0068] Please see Figures 1 to 3 . Figure 1 This is a perspective view of a heating assembly according to a first embodiment of the present invention. Figure 2 For along Figure 1 A partially enlarged view of the side section diagram of the heating assembly shown by the sectional line 2-2 in the figure. Figure 3 for Figure 1 The front view of the heating components assembled into the feed tube.

[0069] In this embodiment, the heating assembly 10 is used to heat a feed tube 20 and includes an assembly cylinder 100, a coil isolator 200, a coil assembly 250, a plurality of heat-insulating supports 300, a mounting cylinder 400, and a plurality of magnets 500. The coil isolator 200 and the coil assembly 250 are disposed in the assembly cylinder 100. The heat-insulating supports 300 and the mounting cylinder 400 are respectively disposed on opposite sides (e.g., the inner and outer sides) of the assembly cylinder 100, and the magnets 500 are disposed in the mounting cylinder 400.

[0070] Please see Figures 2 to 5 . Figure 4 and Figure 5 for Figure 1 An exploded perspective view of the coil isolator and assembly cylinder of the heating assembly. In this embodiment, the assembly cylinder 100 includes a first assembly portion 110 and a second assembly portion 120, and has an outer surface 101 and a mounting groove 102. The assembly cylinder 100 defines a circumferential direction C and an axial direction A. The first assembly portion 110 and the second assembly portion 120 are arranged along the circumferential direction C and are detachably assembled with each other for surrounding the feed tube 20. For example, the first assembly portion 110 has a plurality of first snap-fit ​​structures 111 arranged along the axial direction A. The second assembly portion 120 has a plurality of second snap-fit ​​structures 121 arranged along the axial direction A. These first snap-fit ​​structures 111 and these second snap-fit ​​structures 121 are, for example, snap-fit ​​grooves and snap-fit ​​protrusions that match each other. These first snap-fit ​​structures 111 engage with these second snap-fit ​​structures 121, thereby allowing the first assembly portion 110 to be detachably assembled with the second assembly portion 120. The mounting groove 102 is recessed radially inward from the outer surface 101, for example, in a spiral shape. The outer surface 101 and the mounting groove 102 are simultaneously formed in the first assembly portion 110 and the second assembly portion 120. Alternatively, a first outer surface 103 formed in the first assembly portion 110 and a second outer surface 104 formed in the second assembly portion 120 together constitute the outer surface 101, and a first mounting groove 105 formed in the first assembly portion 110 and a second mounting groove 106 formed in the second assembly portion 120 together constitute the mounting groove 102.

[0071] It should be noted that the present invention is not limited to the form and number of the first snap-fit ​​structure 111 and the second snap-fit ​​structure 121. In other embodiments, the number of both the first snap-fit ​​structure and the second snap-fit ​​structure may be one. In other embodiments, the forms of the first snap-fit ​​structure and the second snap-fit ​​structure may also be interchanged, and they may be a snap-fit ​​protrusion and a snap-fit ​​groove, respectively.

[0072] In this embodiment, the coil isolator 200 includes, for example, a first isolating portion 210 and a second isolating portion 220. The first isolating portion 210 and the second isolating portion 220 are respectively disposed in the first mounting groove 105 of the first assembly portion 110 and the second mounting groove 106 of the second assembly portion 120. The first isolating portion 210 and the second isolating portion 220 are arranged in the circumferential direction C and are detachably assembled with each other. For example, the first isolating portion 210 has a plurality of third snap-fit ​​structures 211 arranged in the axial direction A, and the second isolating portion 220 has a plurality of fourth snap-fit ​​structures 221 arranged in the axial direction A. These third snap-fit ​​structures 211 and these fourth snap-fit ​​structures 221 engage with each other, for example, as matching snap protrusions and snap-fit ​​grooves, thus the first isolating portion 210 is detachably assembled with the second isolating portion 220. The first isolating portion 210 and the second isolating portion 220 are, for example, spirally arranged together. Figure 2 As shown, the coil assembly 250 is disposed in the first mounting groove 105 of the first assembly portion 110 along the first isolation portion 210. It should be noted that, to avoid obscuring the focus of this invention due to the complex three-dimensional shape of the coil assembly 250, in... Figure 4 and Figure 5 The drawing of coil assembly 250 is omitted. Furthermore, Figure 2 The cross-sectional view exemplifies this, showing the coil assembly 250 disposed along the first isolation portion 210 in the first mounting groove 105 of the first assembly portion 110. Although not shown in the drawings, it should be understood that the coil assembly 250 is disposed in a similar manner along the second isolation portion 220 in the second mounting groove 106 of the second assembly portion 120. The coil assembly 250 is used to heat the feed tube 20. The feed tube 20 is made of a conductive material, such as metal, so that it can be heated by the coil assembly 250 through electromagnetic induction. The feed tube 20 can be used, for example, in an injection molding machine and is used to contain plastic. The coil assembly 250 is used to heat the plastic contained in the feed tube 20 to melt it.

[0073] In this embodiment, through the design of the mounting groove 102 and the multi-piece design of the assembly cylinder 100 and the coil isolator 200 arranged along the circumferential direction C, the coil assembly 250 can be installed into the mounting groove 102 in one go along the coil isolator 200, without having to be installed into the assembly cylinder 100 by winding it one turn at a time. In this way, the time for assembling the coil assembly 250 into the assembly cylinder 100 can be saved, thereby saving the time for assembling the heating assembly 10 into the feed tube 20.

[0074] It should be noted that the present invention is not limited to the form and number of the third snap-fit ​​structure 211 and the fourth snap-fit ​​structure 221. In other embodiments, the number of both the third snap-fit ​​structure and the fourth snap-fit ​​structure may be one. In other embodiments, the forms of the third snap-fit ​​structure and the fourth snap-fit ​​structure may also be interchanged, and they may be a snap-fit ​​groove and a snap-fit ​​protrusion, respectively.

[0075] Please see Figure 3 and Figure 6 . Figure 6 for Figure 1 An exploded perspective view of the assembly cylinder and heat insulation support members of the heating component. The assembly cylinder 100 also has an inner surface 107 opposite to the outer surface 101. The first assembly portion 110 and the second assembly portion 120 together constitute the inner surface 107. Alternatively, a first inner surface 108 formed in the first assembly portion 110 and a second inner surface 109 formed in the second assembly portion 120 together constitute the inner surface 107. These heat insulation support members 300 are detachably mounted on the inner surface 107. For example, the assembly cylinder 100 also includes a plurality of first sliding structures 130. These first sliding structures 130 are located on the first inner surface 108 and the second inner surface 109, respectively. Each heat insulation support member 300 has two second sliding structures 310, and the two second sliding structures 310 are located on opposite sides of the heat insulation support member 300, respectively. These first sliding structures 130 and these second sliding structures 310 are, for example, mutually mating grooves and sliders. For example, each of the two second sliding structures 310 of each thermal insulation support 300 engages with two adjacent and separate first sliding structures 130, so that the thermal insulation support 300 is slidably disposed on the inner surface 107 in the axial direction A. These thermal insulation supports 300 are arranged in the circumferential direction C to surround the feed tube 20. Furthermore, the side of these thermal insulation supports 300 away from the assembly cylinder 100 serves, for example, to abut against an insulating sleeve 30, which is then fitted onto the feed tube 20, thereby maintaining the function of supporting the feed tube 20. The insulating sleeve 30, for example, is elastic.

[0076] In this embodiment, the heat insulation support 300 is detachably mounted on the assembly cylinder 100. Therefore, when the heating assembly 10 needs to be installed onto a different sized tube 20 and a different sized heat insulation support 300 needs to be replaced, the heat insulation support 300 can be removed from the assembly cylinder 100 more efficiently. In this way, time can be saved when installing the heating assembly 10 onto the different sized tubes 20.

[0077] Furthermore, in this embodiment, each thermal insulation support 300 also has a perforation 320, for example. When the thermal insulation support 300 is installed on the assembly sleeve 100, the extension direction E1 defined by the perforation 320 is, for example, parallel to the axial direction A. The design of the perforation 320 allows the user to more easily grip the thermal insulation support 300, making it easier to detach and install the thermal insulation support 300 from the insulation sleeve 30. In other embodiments, the thermal insulation support may not require a perforation.

[0078] Furthermore, in this embodiment, the width W of each thermal insulation support 300 in the circumferential direction C gradually decreases from the side closer to the inner surface 107 to the side farther from the inner surface 107. This makes the thermal insulation support 300 more securely mounted on the insulation sleeve 30. In other embodiments, the width of the thermal insulation support in the circumferential direction may also be uniform.

[0079] In this embodiment, the heating assembly 10 includes a plurality of heat-insulating supports 300 arranged along the circumferential direction C to improve the efficiency of assembling and disassembling the heat-insulating supports 300 from the assembly cylinder 100, but the present invention is not limited thereto. In other embodiments, the heating assembly may also include only one heat-insulating support, in which case the heat-insulating support may have an annular shape. Furthermore, the present invention is not limited to the number and form of the first sliding structure 130 and the second sliding structure 310. In other embodiments, the number of the first sliding structure and the second sliding structure may both be one, and the forms of the first sliding structure and the second sliding structure may be interchanged, namely a slider and a groove, respectively.

[0080] Please see Figure 2 , 3 , Figure 7 and Figure 8 . Figure 7 for Figure 1 A partially enlarged exploded view of the three-dimensional exploded view of the assembly cylinder and mounting cylinder of the heating component. Figure 8 For along Figure 2 A partially enlarged view of the side cross-sectional schematic diagram of the heating component.

[0081] The mounting cylinder 400 is detachably disposed on and surrounds the assembly cylinder 100. For example, the mounting cylinder 400 includes a first mounting portion 410 and a second mounting portion 420 arranged in the circumferential direction C. The first mounting portion 410 and the second mounting portion 420 are detachably disposed on the first assembly portion 110 and the second assembly portion 120 in a similar manner, respectively. Therefore, the specific manner in which the first mounting portion 410 is detachably disposed on the first assembly portion 110 will be described below by way of example. In detail, the first isolation portion 210 and the second isolation portion 220 each also have a plurality of protruding strips 240 and a plurality of locking protrusions 241. The assembly method between the first isolation portion 210 and the first mounting portion 410 will be described below as an example, and the assembly method between the second isolation portion 220 and the second mounting portion 420 will not be repeated. The protruding strip 240 protrudes from an outer surface 2101 of the first isolation portion 210 and has a fixed side 2400 and a snap-fit ​​side 2401 adjacent to each other. The fixed side 2400 is connected to the outer surface 2101. These latching protrusions 241 protrude from the latching sides 2401 of these outer protrusions 240. The first mounting portion 410 has a plurality of inner protrusions 411. The inner protrusions 411 are located on the side of the first mounting portion 410 near the first assembly portion 110 and have an engagement groove 412. These latching protrusions 241 engage with the engagement grooves 412, thereby allowing the first mounting portion 410 to be detachably disposed in the first isolation portion 210. Furthermore, in this embodiment, each latching protrusion 241 has, for example, a guide ramp 242 to allow the latching protrusion 241 to engage more smoothly in the engagement groove 412.

[0082] In addition, such as Figure 8 As shown, in this embodiment, the coil assembly 250 includes, for example, multiple layers of copper wire. Each first mounting slot 105 may contain, for example, 10 layers of copper wire or 10 bundles of copper wire, where each bundle may contain 5 copper wires. In other embodiments, the number of copper wires in each first mounting slot can be adjusted according to actual needs.

[0083] Please refer to it again. Figure 2 and Figure 3 In this embodiment, the mounting cylinder 400 has, for example, a plurality of engaging holes 430. These engaging holes 430 are located in the first mounting portion 410 and the second mounting portion 420, respectively. These engaging holes 430 extend in the axial direction A and are arranged in the circumferential direction C. The magnets 500 are at least partially disposed in these engaging holes 430. Specifically, in this embodiment, each magnet 500 includes a first plate portion 510 and a second plate portion 520. The first plate portions 510 are located in these engaging holes 430. The second plate portion 520 protrudes from one side of the first plate portion 510 in a radial direction defined by the mounting cylinder 400 and is located outside the engaging hole 430, but the invention is not limited thereto. In other embodiments, the shape of the engaging hole may be modified so that the second plate portion is located within the engaging hole.

[0084] In this embodiment, the magnet 500 can alter the magnetic field generated by the coil assembly 250, allowing the coil assembly 250 to heat the feed tube 20 more effectively. In other embodiments, if there is no high requirement for the heating effect of the feed tube, the heating assembly may not need to include the mounting cylinder 400 and the magnet 500.

[0085] Other embodiments will be listed below for illustration. It must be noted that the following embodiments use the component reference numerals and some content from the foregoing embodiments, with the same reference numerals representing the same or similar components, and descriptions of identical technical content omitted. For explanations of the omitted parts, please refer to the foregoing embodiments; these will not be repeated in the following embodiments.

[0086] This invention is not limited to the form of a mounting sleeve and a magnet. Please refer to [link / reference]. Figures 9 to 11 . Figure 9 This is a perspective view of a heating assembly according to a second embodiment of the present invention. Figure 10 For along Figure 9 A partially enlarged view of the side section diagram of the heating assembly shown by section line 10-10 in the figure. Figure 11 for Figure 9 The heating assembly 10a is shown in the front view. In this embodiment, the heating assembly 10a includes an assembly cylinder 100, a coil isolator 200, a coil assembly 250, a plurality of heat-insulating supports 300, a mounting cylinder 400a, and a plurality of magnets 500a.

[0087] In this embodiment, the engaging holes 430a of the mounting cylinder 400a include a plurality of first engaging holes 431a and a plurality of second engaging holes 432a. The magnets 500a include a plurality of first magnets 530a and a plurality of second magnets 540a. The first engaging holes 431a are arranged along the circumferential direction C. The second engaging holes 432a are arranged along the circumferential direction C and radially adjacent to the first engaging holes 431a. The first magnets 530a are respectively disposed in the first engaging holes 431a. The second magnets 540a are respectively disposed in the second engaging holes 432a. Furthermore, in this embodiment, the first magnet 530a includes, for example, a first plate portion 531a and a second plate portion 532a. The first plate portion 531a and the second plate portion 532a are connected to each other and are not parallel to each other, for example, forming a V-shape together. The first plate portion 531a and the second plate portion 532a are located in the first engaging holes 431a. The second plate portion 532a is, for example, flat.

[0088] In this embodiment, the first magnet 530a is radially located outside the second magnet 540a, but the invention is not limited thereto. In other embodiments, the first magnet may also be radially located inside the second magnet. In this embodiment, the magnet 500a includes a set of radially separated first magnets 530a and a set of second magnets 540a, but the invention is not limited thereto. In other embodiments, the magnet may also include two or more radially separated sets of first magnets 530a, or two or more radially separated sets of second magnets 540a. It should be noted that in other embodiments, the magnet may also include only the first magnet 530a or the second magnet 540a.

[0089] According to the heating assembly disclosed in the above embodiments, the assembly cylinder has a mounting groove that is radially recessed inward from its outer surface, and both the assembly cylinder and the coil isolator adopt a multi-piece design arranged in the circumferential direction (i.e., the assembly cylinder includes a first assembly portion and a second assembly portion arranged in the circumferential direction, and the coil isolator includes a first isolation portion and a second isolation portion arranged in the circumferential direction). Therefore, the coil assembly can be installed into the mounting groove in one go along the coil isolator, without having to be installed into the assembly cylinder by winding it turn by turn. In this way, the time for assembling the coil assembly into the assembly cylinder can be saved, thereby saving the time for assembling the heating assembly into the feed tube.

Claims

1. A heating assembly for heating a feed tube and comprising: An assembly cylinder has an outer surface and a mounting groove that is radially recessed inward from the outer surface, the assembly cylinder being used to surround the feed tube; A coil isolator is provided in these mounting slots; and A coil assembly is disposed in the mounting slots along the coil isolator and is used to heat the feed tube; in, The assembly cylinder defines a circumferential direction and includes a first assembly part and a second assembly part. The first assembly part and the second assembly part are arranged along the circumferential direction and are detachably assembled with each other. The first assembly part and the second assembly part together constitute the outer surface and the mounting groove; and The coil isolator includes a first isolating part and a second isolating part, which are respectively disposed in the first assembly part and the second assembly part. The first isolating part and the second isolating part are arranged along the circumferential direction and are detachably assembled with each other.

2. The heating assembly as claimed in claim 1, wherein the first assembly portion has at least one first snap-fit ​​structure, the second assembly portion has at least one second snap-fit ​​structure, and the at least one first snap-fit ​​structure and the at least one second snap-fit ​​structure are matching concave-convex structures that engage with each other.

3. The heating assembly as claimed in claim 2, wherein the first isolation portion has at least one third snap-fit ​​structure, the second isolation portion has at least one fourth snap-fit ​​structure, and the at least one third snap-fit ​​structure and the at least one fourth snap-fit ​​structure are matching concave-convex structures that engage with each other.

4. The heating assembly as claimed in claim 1, wherein the mounting groove is spiral-shaped, and the first isolation portion and the second isolation portion are both spiral-shaped.

5. The heating assembly of claim 1 further includes at least one heat-insulating support member, the assembly cylinder having an inner surface opposite to the outer surface, the at least one heat-insulating support member being detachably mounted on the inner surface of the assembly cylinder, and the side of the at least one heat-insulating support member away from the assembly cylinder being disposed on the feed tube.

6. The heating assembly of claim 5, wherein the assembly cylinder further defines an axial direction and further includes at least one first sliding structure located on the inner surface, the at least one thermal insulation support having at least one second sliding structure, the at least one first sliding structure and the at least one second sliding structure being mutually matching concave-convex structures and engaging with each other, so that the at least one thermal insulation support is slidably disposed on the inner surface of the assembly cylinder along the axial direction.

7. The heating assembly of claim 6, wherein the at least one first sliding structure and the at least one second sliding structure are respectively a slide groove and a slider.

8. The heating assembly of claim 7, wherein the number of the at least one first sliding structure is two and the number of the at least one second sliding structure is two, the two first sliding structures are separated from each other, and the two second sliding structures are respectively located on opposite sides of the at least one heat insulation support and are respectively engaged with the two first sliding structures.

9. The heating assembly of claim 5, wherein the assembly cylinder further defines an axial direction, the at least one thermal insulation support has a through hole, and when the at least one thermal insulation support is installed in the assembly cylinder, an extension direction defined by the through hole is parallel to the axial direction.

10. The heating assembly of claim 5, wherein the width of the at least one thermal insulation support in the circumferential direction gradually decreases from the side closer to the inner surface to the side farther from the inner surface.

11. The heating assembly of claim 5, wherein the number of the at least one heat-insulating support member is multiple, and the heat-insulating supports members are arranged along the circumferential direction for surrounding the feed tube.

12. The heating assembly of claim 1, further comprising a mounting cylinder and at least one magnet, the mounting cylinder being detachably disposed on and surrounding the assembly cylinder, the at least one magnet being disposed on the mounting cylinder.

13. The heating assembly of claim 12, wherein the assembly tube further comprises an outer protrusion and a locking protrusion, the outer protrusion protruding from the outer surface and having a fixed side and a locking side adjacent to each other, the fixed side being connected to the outer surface, the locking protrusion protruding from the locking side, the mounting tube having an inner protrusion located on the side of the mounting tube near the assembly tube and having an engaging groove, the locking protrusion engaging in the engaging groove to detachably mount the mounting tube in the assembly tube.

14. The heating assembly of claim 13, wherein the card protrusion has a guide bevel.

15. The heating assembly of claim 12, wherein the assembly cylinder further defines an axial direction, the mounting cylinder has at least one engagement hole extending along the axial direction, and the at least one magnet is at least partially disposed in the at least one engagement hole.

16. The heating assembly of claim 15, wherein the at least one magnet includes a first plate portion and a second plate portion, the first plate portion being located in the at least one engagement hole, and the second plate portion protruding from one side of the first plate portion along a radial direction defined by the mounting cylinder and located outside the engagement hole.

17. The heating assembly of claim 15, wherein the at least one magnet includes a first plate portion and a second plate portion, the first plate portion and the second plate portion being connected to each other and not parallel to each other, and the first plate portion and the second plate portion being located in the at least one engagement hole.

18. The heating assembly of claim 15, wherein the number of the at least one engaging hole is plurality of the number of the at least one magnet is plurality of the number of the engaging holes arranged along the circumferential direction, and the magnets are respectively at least partially disposed in the engaging holes.

19. The heating assembly of claim 18, wherein the engaging holes include a plurality of first engaging holes and a plurality of second engaging holes, the magnets include a plurality of first magnets and a plurality of second magnets, the first engaging holes are arranged along the circumferential direction, the second engaging holes are arranged along the circumferential direction and radially separated from the first engaging holes, the first magnets are at least partially disposed in the first engaging holes, and the second magnets are at least partially disposed in the second engaging holes.

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