A variable diameter heating ring

Abstract

The present invention discloses a variable diameter heating ring, which is used to be installed in a heated body and to make heat-conducting contact with the inner wall surface of the heated body. The variable diameter heating ring includes: a heating ring body surrounded by a plurality of heating plates and a tensioning device arranged at the gaps surrounded by each adjacent heating plate; the tensioning device includes an adjusting component that can move axially relative to the heating ring body and a first connecting portion and a second connecting portion that are respectively arranged at the ends of two adjacent heating plates, and the adjusting component is configured to be able to push the first connecting portion away from the second connecting portion when subjected to axial power. By adding a tensioning device at the opening of the heating ring, not only the adjacent heating plates are matched and connected, but also the purpose of adjusting the diameter of the heating ring body is achieved by converting the axial displacement of the adjusting bolt into the circumferential and radial displacement of the first connecting portion, so that the heating ring body is pressed against the inner wall of the heated body, the heat energy of the heating ring is not wasted, and the service life of the heating ring is extended.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe molding, in particular to a diameter-variable heating ring. Background Art

[0002] In the prior art, plastic pipes are mostly made of pipe extrusion molding equipment, which is made by melting the polymer material, extruding it, and finally cooling it to form the pipe. The heating methods of pipe forming molds (such as PE molds) include external surface heating and internal heating; external surface heating is generally achieved by wrapping a ceramic or mica heating coil around the outer surface of the outer mold sleeve, and internal heating is generally achieved by placing a cast aluminum heating coil inside the core mold for heating; the cast aluminum heating coil is not easily damaged and can also be cooled by water. At present, PE molds with small diameters all use cast aluminum heating coils made into a full circle; PE molds with large diameters require cast aluminum heating coils with large external dimensions. Such large-sized cast aluminum heating coils are difficult to install as a whole inside the mold, and there is also the problem of not being able to fit tightly against the inner wall of the mold, which often results in a waste of heat energy from the heating coil, and the heating coil is also prone to burnout, reducing the service life of the heating coil. Summary of the invention

[0003] The problem to be solved by the present invention is that the outer diameter of the existing rigid heating coil cannot fit the inner wall of the heated cylinder.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a variable diameter heating ring, which is used to be installed in a heated body and to make heat-conducting contact with the inner wall surface of the heated body, and the variable diameter heating ring includes: a heating ring body surrounded by a plurality of heating plates and a tensioning device arranged at the enclosed gaps of each adjacent heating plate; the tensioning device includes an adjusting component that can move axially relative to the heating ring body and a first connecting part and a second connecting part respectively arranged at the ends of two adjacent heating plates, and the adjusting component is configured to be able to push the first connecting part away from the second connecting part when subjected to axial force.

[0005] In the above technical solution, it is further preferred that at least one of the first connecting part and the second connecting part has a sliding surface that changes simultaneously in the radial direction and the circumferential direction, and the adjusting part has a contact part that abuts against the sliding surface; when the adjusting part approaches or moves away from the heating coil body in the axial direction, the contact part can move along the sliding surface of the first connecting part or the second connecting part.

[0006] In the above technical solution, it is further preferred that the adjusting component is threadedly connected to one of the first connecting part or the second connecting part.

[0007] In the above technical solution, it is further preferred that the adjusting component includes a pair of adjusting bolts.

[0008] In the above technical solution, it is further preferred that the sliding surface is an arc surface or an inclined surface.

[0009] In the above technical solution, it is further preferred that the first connecting portion has a protrusion facing the second connecting portion, and the second connecting portion has a notch facing the first connecting portion, and the protrusion matches the notch.

[0010] In the above technical solution, it is further preferred that the heating coil body is cast by aluminum alloy.

[0011] In the above technical solution, it is further preferred that the heating coil further includes a plurality of electric heating tube assemblies, and the plurality of electric heating tube assemblies are arranged in the heating coil body and are configured to generate heat and heat the heating coil body after being energized.

[0012] In the above technical solution, it is further preferred that the first connecting portion and the second connecting portion of each of the tensioning devices are respectively formed integrally on adjacent ends of at least two of the heating plates.

[0013] In the above technical solution, it is further preferred that the lengths and curvatures of the plurality of heating plates are consistent.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention adds a tensioning device at the opening of the heating coil, which not only enables adjacent heating plates to be matched and connected, but also achieves the purpose of adjusting the diameter of the heating coil body by converting the axial displacement of the adjusting bolt into circumferential and radial displacement of the first connecting part, so that the heating coil body is tightly attached to the inner wall of the heated body, without wasting the heat energy of the heating coil and extending the service life of the heating coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a three-dimensional structure of the first embodiment of the present invention installed inside a heated body;

[0017] Figure 2 A front view of a first embodiment of the present invention;

[0018] Figure 3 It is a left side view of the first embodiment of the present invention;

[0019] Figure 4 for Figure 3 A local enlarged schematic diagram of point A;

[0020] Figure 5 It is a left side view of the second embodiment of the present invention;

[0021] Figure 6for Figure 5 A local enlarged schematic diagram of point B. DETAILED DESCRIPTION

[0022] In order to describe the technical content, structural features, achieved purposes and effects of the invention in detail, the technical solutions in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0023] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0024] In addition, in the present invention, spatial relative terms such as "under", "below", "under", "down", "above", "upper", "above", "higher", "side" (for example, as in "side wall"), etc., are used to describe the relationship between one element and another (other) element as shown in the drawings. The spatial relative terms are intended to include different orientations of the device in use, operation and / or manufacture other than the orientation depicted in the drawings. For example, if the device in the drawings is turned over, the elements described as "under" or "below" other elements or features will then be positioned as "above" the other elements or features. Therefore, the exemplary term "under" can include both above and below orientations. In addition, the device can be positioned otherwise (for example, rotated 90 degrees or at other orientations), so the spatial relative descriptors used herein are interpreted accordingly.

[0025] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0026] The present invention is a heating coil with a variable diameter, which is used to be arranged inside a heated body 4 to heat the heated body 4. The heating coil comprises a heating coil body 1, a tensioning device 2 and a plurality of electric heating tube assemblies 3, and the outer surface of the heating coil body 1 is in close contact with the inner wall surface of the heated body 4. The heating coil body 1 is surrounded by a plurality of heating plates 11 with the same arc and length, and the heating coil body 1 is cast by casting aluminum alloy. A plurality of electric heating tube assemblies 3 are arranged in the heating coil body 1, and the electric heating tube assemblies 3 can generate heat after being powered on to achieve the purpose of heating the heating coil body 1.

[0027] like Figures 1 to 4 In the first embodiment shown, the heating coil body 1 is formed by two semicircular heating plates 11 surrounded by a tensioning device 2 , and the two heating plates 11 are arranged inside the heated body 4 in an upper and lower opposed manner.

[0028] A pair of tensioning devices 2 are arranged at the left and right ends of the two heating plates 11, and the tensioning devices 2 include a pair of adjusting bolts 23 that can move axially relative to the heating coil body 1, and a first connecting portion 21 and a second connecting portion 22 that are respectively arranged at the adjacent ends of the two heating plates 11; the first connecting portion 21 and the second connecting portion 22 are respectively formed integrally on the adjacent ends of the two heating plates 11; in other embodiments, the first connecting portion 21 and the second connecting portion 22 can be respectively fixed on the adjacent ends of the two heating plates 11 by other types or combinations (welding, fasteners, adhesives).

[0029] The first connection part 21 has a protrusion 210 facing the second connection part 22, and a sliding surface 211 facing the second connection part 22 is formed on the protrusion 210; the second connection part 22 has a notch 220 facing the first connection part 21; the sliding surface 211 is an inclined surface, and the protrusion 210 and the notch 220 match.

[0030] A pair of adjusting bolts 23 are threadedly connected to the second connecting portion 22 in a relative manner, and the pair of adjusting bolts 23 also have a contact portion 231 abutting against the sliding surface 211; when the pair of adjusting bolts approach or move away from the heating coil body 1 axially, the contact portion 231 can move along the sliding surface 211, so that the first connecting portion 21 can move circumferentially and radially.

[0031] Rotate the pair of adjusting bolts 23. When the pair of adjusting bolts 23 moves away from the heating coil body 1, the first connecting portion 21 moves toward the second connecting portion 22 under the weight of the heating plate 11 and its own gravity until the pair of adjusting bolts 23 are hidden in the second connecting portion 22 and the protrusion 210 and the notch 220 are in contact. When the pair of adjusting bolts 23 moves toward the heating coil body 1, the abutted first connecting portion 21 moves away from the second connecting portion 22 under the axial thrust of the pair of adjusting bolts 23.

[0032] The working principle is that after placing the heating coil inside the heated body 4, rotate the adjusting bolts 23 on a pair of tensioning devices 2 to continuously move the first connection portion 21 and the second connection portion 22 away from each other until the outer surfaces of the two heating plates 11 are in close contact with the inner wall surface of the heated body 4, connect the wiring of several electric heating tube assemblies 3 to an external power source, and when the heated body 4 is in use, turn on the power supply to energize the electric heating tube assembly 3 to heat the heating coil body 1.

[0033] like Figure 5 , 6 In the second embodiment shown, the tensioning device 2' is arranged at the adjacent ends of a pair of oppositely arranged heating plates 11', and the sliding surface 211' of the tensioning device 2' is an arc surface, and the sliding surface 211' is formed on the protrusion 210' of the first connecting part 21' toward the second connecting part 22', and the protrusion 210' and the notch 220' of the second connecting part 22' match, and a pair of adjustment bolts 23' abut against the sliding surface 211'. The adjustment method and steps of the tensioning device 2' are the same as those of the tensioning device 2 of the first embodiment, and are not repeated here.

[0034] The present invention adds a tensioning device 2 at the opening of the heating coil, which not only enables adjacent heating plates 11 to be matched and connected, but also achieves the purpose of adjusting the diameter of the heating coil body 1 by converting the axial displacement of the adjusting bolt 23 into the circumferential and radial displacements of the first connecting portion 21, so that the heating coil body 1 is tightly attached to the inner wall of the heated body 4, without wasting the heat energy of the heating coil and extending the service life of the heating coil.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and the scope of protection of the present invention is defined by the attached claims, description and their equivalents.

Claims

1. A variable diameter heating ring, used for being installed in a heated body (4) and being in heat-conducting contact with the inner wall surface of the heated body (4), characterized in that: The variable diameter heating ring comprises: a heating ring body (1) formed by enclosing a plurality of heating plates (11), and a tensioning device (2) arranged at the enclosed gaps of adjacent heating plates (11); The tensioning device (2) comprises an adjusting component capable of axially moving relative to the heating coil body (1), and a first connecting portion (21) and a second connecting portion (22) respectively arranged at the ends of two adjacent heating plates (11), wherein the adjusting component is configured to be able to push the first connecting portion (21) away from the second connecting portion (22) when subjected to axial force; at least one of the first connecting portion (21) and the second connecting portion (22) has a sliding surface that changes simultaneously in the radial direction and the circumferential direction, and the adjusting component has a contact portion that abuts against the sliding surface; when the adjusting component approaches or moves away from the heating coil body (1) in the axial direction, the contact portion is able to move along the sliding surface of the first connecting portion (21) or the second connecting portion (22).

2. The variable diameter heating coil according to claim 1, characterized in that: The adjusting component is threadedly connected to one of the first connecting portion (21) or the second connecting portion (22).

3. The variable diameter heating coil according to claim 2, characterized in that: The adjustment component comprises a pair of adjustment bolts (23).

4. The variable diameter heating coil according to claim 1, characterized in that: The sliding surface is an arc surface or an inclined surface.

5. The variable diameter heating coil according to claim 1, characterized in that: The first connecting portion (21) has a protrusion (210) facing the second connecting portion (22), the second connecting portion (22) has a notch (220) facing the first connecting portion (21), and the protrusion (210) matches the notch (220).

6. The variable diameter heating coil according to claim 1, characterized in that: The heating coil body (1) is made by casting aluminum alloy.

7. The variable diameter heating coil according to claim 1, characterized in that: The heating coil further comprises a plurality of electric heating tube assemblies (3), wherein the plurality of electric heating tube assemblies (3) are arranged in the heating coil body (1) and are configured to generate heat and heat the heating coil body (1) when energized.

8. The variable diameter heating coil according to claim 1, characterized in that: The first connecting portion (21) and the second connecting portion (22) of each of the tensioning devices are respectively formed integrally on adjacent ends of at least two of the heating plates (11).

9. The variable diameter heating coil according to claim 1, characterized in that: The lengths and curvatures of the plurality of heating plates (11) are consistent.

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