Ceramic heater threading ceramic assembly for injection molding machine

Abstract

According to the ceramic heater wire penetrating ceramic assembly for the injection molding machine, a plurality of wire penetrating holes are formed in ceramic strips in the width direction, and the wire penetrating holes formed in all the ceramic strips are located in the same plane, so that heating wires can sequentially penetrate through the wire penetrating holes according to the arrangement sequence of the wire penetrating holes to form continuous U-shaped heating wires; the continuous U-shaped heating wire can be distributed on the whole side face of the wire penetrating ceramic assembly, the heat transfer contact area of the heating wire and the ceramic strip is increased, the heat transfer efficiency and the heat transfer effect are improved, the thickness of the ceramic strip can be reduced, assembling is convenient, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of injection molding machine heaters, and specifically relates to a wire-passing ceramic component of a ceramic heater for an injection molding machine. Background Art

[0002] As an important electric heater, the ceramic heating coil is widely used in the barrel heating of plastic injection molding machines. This heater uses a high-quality nickel-chromium alloy heating wire as the core heating element, and is made by threading the wire through ceramic strips, with the ceramic material as the medium for heat conduction. The traditional ceramic electric heating coil includes ceramic strips and heating wires. The ceramic body is usually formed by relatively rotatably connecting multiple adjacent ceramic components. On each ceramic body, there are "0"-shaped or "o"-shaped through holes for the heating wires to pass through, and the heating wires pass through these through holes in a spiral shape in sequence. This design has several defects in practical applications. First, due to the setting of the "0"-shaped or "o"-shaped through holes and the structure of the spiral heating wires, the overall thickness of the heating coil is relatively large, resulting in a relatively large overall external dimension. During the installation process of the injection molding machine barrel, it is easy to interfere with the barrel protective cover and the injection molding machine template, and even cause collision damage. Second, since the heating wire has a three-dimensional spiral structure, the center distance between it and the object to be heated is relatively far, resulting in a reduction in heat transfer efficiency. The reduction in heat transfer efficiency directly affects the heating effect, increases energy consumption at the same time, and reduces the energy utilization efficiency of the equipment. In addition, the relatively thick ceramic body not only increases the material usage but also raises the manufacturing cost, leading to a decline in the market competitiveness of the product. Content of the Utility Model

[0003] Aiming at the deficiencies existing in the prior art, the purpose of this application is to provide a wire-passing ceramic component of a ceramic heater for an injection molding machine to solve the problems raised in the above background art.

[0004] According to one aspect of the present application, a wire-passing ceramic component of a ceramic heater for an injection molding machine includes ceramic strips, heating wires, and a heat insulation layer. A plurality of the ceramic strips are provided. One side surface of each ceramic strip is an arc convex surface and the other side surface is an arc concave surface. The radius of the arc convex surface is the same as the radius of the arc concave surface, and the arc convex surfaces and the arc concave surfaces of every two adjacent ceramic strips are in rotational contact connection. A plurality of wire-passing holes are equidistantly arranged along the width direction of each ceramic strip, and each wire-passing hole extends along the length direction of the ceramic strip to both end faces of the ceramic strip. The wire-passing holes on all the ceramic strips are arranged on the same horizontal plane. The heating wires pass through the wire-passing holes in sequence according to the arrangement order of the wire-passing holes on all the ceramic strips to form a continuous U-shaped heating wire. A heat insulation layer that sequentially crosses all the ceramic strips is arranged at a position below the heating wires inside the ceramic strips. Protective covers are arranged at both ends of each ceramic strip, and the protective covers can cover the U-shaped ends of the continuous U-shaped heating wire that extend beyond the ceramic strips.

[0005] Preferably, two layers of wire-passing holes are arranged on each ceramic strip, and the wire-passing holes of the two layers are arranged in a staggered manner, so that the continuous U-shaped heating wires of the two layers are arranged in a staggered manner.

[0006] Preferably, the shape of the protective cover is the same as the shape of the ceramic strip, and an opening groove is formed on the side wall of each protective cover at a position where the continuous U-shaped heating wire passes through.

[0007] Preferably, annular grooves are formed on the circumferences of both ends of the ceramic strip, and the shape and size of the inner side wall of the protective cover are adapted to the shape and size of the annular grooves.

[0008] Preferably, the outer wall surface of the ceramic strip close to the heat insulation layer is a heat insulation wall surface, and the outer wall surface of the ceramic strip close to the heating wire is a heating wall surface.

[0009] Preferably, the heating wire is made of a flexible material.

[0010] Preferably, when the wire-passing ceramic component is installed on the metal shell of the ceramic heater, the bent edge of the metal shell wraps the protective covers at both ends of the ceramic strip, and the heating wall surface of the ceramic strip faces the inner opening of the metal shell, and the heat insulation wall surface of the ceramic strip faces the outer shell wall of the metal shell. Heat insulation cotton is arranged between the metal shell and the wire-passing ceramic component.

[0011] The advantages of this application compared with the prior art are as follows: For the wire-threading ceramic component of the ceramic heater for an injection molding machine in this application, through a plurality of wire-threading holes opened in the ceramic strip along the width direction, and all the wire-threading holes opened in the ceramic strips are on the same plane, so that the heating wire can pass through in sequence according to the arrangement order of the wire-threading holes to form a continuous U-shaped heating wire, and the continuous U-shaped heating wire can be distributed on the entire side surface of the wire-threading ceramic component, increasing the heat transfer contact area between the heating wire and the ceramic strip, improving the heat transfer efficiency and heat transfer effect, and also being able to reduce the thickness of the ceramic strip, facilitating assembly, and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. 6 is a perspective view of a wire-threading ceramic component of a ceramic heater for an injection molding machine according to an embodiment of the present application.

[0013] Figure 2 FIG. 10 is a perspective exploded view of a wire-threading ceramic component of a ceramic heater for an injection molding machine according to an embodiment of the present application.

[0014] Figure 3 FIG. 14 is a side cross-sectional view of a wire-threading ceramic component of a ceramic heater for an injection molding machine according to an embodiment of the present application.

[0015] Figure 4 FIG. 18 is a partial exploded view of a wire-threading ceramic component of a ceramic heater for an injection molding machine according to an embodiment of the present application.

[0016] Figure 5 FIG. 22 is a cross-sectional structural view of a continuous U-shaped heating wire of a wire-threading ceramic component of a ceramic heater for an injection molding machine according to an embodiment of the present application.

[0017] Figure 6 FIG. 26 is a perspective view of a continuous U-shaped heating wire of a wire-threading ceramic component of a ceramic heater for an injection molding machine according to an embodiment of the present application.

[0018] Figure 7 FIG. 30 is a perspective assembled view of a wire-threading ceramic component of a ceramic heater for an injection molding machine according to an embodiment of the present application.

[0019] Reference numerals: 1, ceramic strip; 101, arc convex surface; 102, arc concave surface; 103, heat insulation wall surface; 104, heating wall surface; 2, heating wire; 201, continuous U-shaped heating wire; 3, heat insulation layer; 4, protective cover; 401, opening groove; 5, annular groove; 6, metal shell; 7, heat insulation cotton. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the content of this application easier to be clearly understood, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the Figure 3 accompanying drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0021] As Figures 1 to 7 shown, a wire-passing ceramic component of a ceramic heater for an injection molding machine includes ceramic strips 1, heating wires 2 and a heat insulation layer 3. There are multiple ceramic strips 1. One side surface of each ceramic strip 1 is an arc convex surface 101 and the other side surface is an arc concave surface 102. The radius of the arc convex surface 101 is consistent with the radius of the arc concave surface 102, and the arc convex surfaces 101 and the arc concave surfaces 102 of every two adjacent ceramic strips 1 are in rotational contact connection. Each ceramic strip 1 is evenly provided with a plurality of wire-passing holes along its width direction, and each wire-passing hole extends along the length direction of the ceramic strip 1 to both end faces of the ceramic strip 1. The wire-passing holes on all the ceramic strips 1 are arranged on the same plane. The heating wires 2 pass through the wire-passing holes in sequence according to the arrangement order of the wire-passing holes on all the ceramic strips 1 to form a continuous U-shaped heating wire 201. The continuous U-shaped heating wire 201 can be distributed on the entire side surface of the wire-passing ceramic component, increasing the heat transfer contact area between the heating wire 2 and the ceramic strip 1, improving the heat transfer efficiency and heat transfer effect, and also being able to reduce the thickness of the ceramic strip 1, facilitating assembly and reducing the production cost. In a specific design, each ceramic strip 1 is provided with two layers of wire-passing holes, and the wire-passing holes of the two layers are arranged in a staggered manner, so that the continuous U-shaped heating wires 201 of the two layers are arranged in a staggered manner (as Figure 3As shown in the figure, this design can further increase the heat transfer contact area between the heating wire 2 and the ceramic strip 1, improving the heat transfer efficiency and effect. An insulating layer 3 that runs across all the ceramic strips 1 in sequence is provided at the position below the heating wire 2 inside the ceramic strip 1. The material of the insulating layer 3 can be selected as insulating cotton 7. The outer wall surface of the ceramic strip 1 close to the insulating layer 3 is an insulating wall surface 103, and the outer wall surface of the ceramic strip 1 close to the heating wire 2 is a heating wall surface 104. The heating wall surface 104 is used to contact the screw barrel of the injection molding machine. The setting of the above insulating layer 3 can reduce the heat transfer of the continuous U-shaped heating wire 201 towards the insulating wall surface 103, and thus make the heat of the heating wire 2 concentrated on the heating wall surface 104, enhancing the heat transfer efficiency of the continuous U-shaped heating wire 201 to the heating wall surface 104. In addition, protective covers 4 are provided at both ends of each ceramic strip 1. Annular grooves 5 are formed on the circumferential sides at both ends of the ceramic strip 1. The shape and size of the inner side wall of the protective cover 4 are adapted to those of the annular groove 5. The protective cover 4 is assembled to both ends of the ceramic strip 1 through the annular groove 5. The protective cover 4 can cover the U-shaped ends of the continuous U-shaped heating wire 201 that extend beyond the ceramic strip 1. Specifically, the shape of the protective cover 4 is consistent with that of the ceramic strip 1 to facilitate the rotational connection of adjacent ceramic strips 1. An opening groove 401 is formed on the side wall of each protective cover 4 at the position where the continuous U-shaped heating wire 201 passes through. In addition, the heating wire 2 is made of a flexible material to ensure that adjacent ceramic strips 1 can rotate relative to each other during the assembly of the wire-passing ceramic component, such as Figure 7 As shown in the figure, when assembling the wire-passing ceramic component onto the metal shell 6 of the ceramic heater, the bent edge of the metal shell 6 covers the protective covers 4 at both ends of the ceramic strip 1. The heating wall surface 104 of the ceramic strip 1 faces the inner opening of the metal shell 6, and the insulating wall surface 103 of the ceramic strip 1 faces the outer shell wall of the metal shell 6. An insulating cotton 7 is provided between the metal shell 6 and the wire-passing ceramic component.

[0022] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that without departing from the spirit and scope defined by the claims of the present application, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features.

Claims

1. A wire-threading ceramic component of a ceramic heater for an injection molding machine, comprising ceramic bars (1), heating wires (2) and a heat insulation layer (3). A plurality of the ceramic bars (1) are provided. One side surface of each ceramic bar (1) is an arc-shaped convex surface (101) and the other side surface thereof is an arc-shaped concave surface (102). The radius of the arc-shaped convex surface (101) is consistent with the radius of the arc-shaped concave surface (102). The arc-shaped convex surfaces (101) and the arc-shaped concave surfaces (102) of every two adjacent ceramic bars (1) are rotationally and contact-connected. It is characterized in that, Each of the ceramic strips (1) is provided with a plurality of wire threading holes at equal intervals along its width direction, and each of the wire threading holes extends along the length direction of the ceramic strip (1) to both end faces of the ceramic strip (1). The wire threading holes on all the ceramic strips (1) are arranged on the same plane. The heating wire (2) passes through the wire threading holes in sequence according to the arrangement order of the wire threading holes on all the ceramic strips (1) to form a continuous U-shaped heating wire (201). An insulating layer (3) that sequentially crosses all the ceramic strips (1) is arranged at a position below the heating wire (2) inside the ceramic strip (1). A protective cover (4) is arranged at both ends of each ceramic strip (1), and the protective cover (4) can cover the U-shaped ends of the continuous U-shaped heating wire (201) that extend beyond the ceramic strip (1).

2. The wire threading ceramic component of the ceramic heater for an injection molding machine according to claim 1, characterized in that, Each of the ceramic strips (1) is provided with two layers of wire threading holes, and the wire threading holes of the two layers are arranged in a staggered manner, so that the continuous U-shaped heating wires (201) of the two layers are arranged in a staggered manner.

3. The wire threading ceramic component of the ceramic heater for an injection molding machine according to claim 1, characterized in that, The shape of the protective cover (4) is consistent with the shape of the ceramic strip (1), and an opening groove (401) is formed on the side wall of each protective cover (4) at the position where the continuous U-shaped heating wire (201) passes.

4. A wire threading ceramic component of a ceramic heater for an injection molding machine according to claim 1, characterized in that, Annular grooves (5) are formed on the circumferences at both ends of the ceramic strip (1), and the shape and size of the inner side wall of the protective cover (4) are adapted to the shape and size of the annular grooves (5).

5. A wire threading ceramic component of a ceramic heater for an injection molding machine according to claim 1, characterized in that, The outer wall surface of the ceramic strip (1) close to the insulating layer (3) is an insulating wall surface (103), and the outer wall surface of the ceramic strip (1) close to the heating wire (2) is a heating wall surface (104).

6. The wire threading ceramic component of the ceramic heater for an injection molding machine according to claim 1, characterized in that, The heating wire (2) is made of a flexible material.

7. The wire threading ceramic component of the ceramic heater for an injection molding machine according to claim 5, characterized in that, When assembling the wire threading ceramic assembly onto the metal shell (6) of the ceramic heater, the bent edge of the metal shell (6) covers the protective covers (4) at both ends of the ceramic strip (1), and the heating wall surface (104) of the ceramic strip (1) faces the inner opening of the metal shell (6), and the insulating wall surface (103) of the ceramic strip (1) faces the outer shell wall of the metal shell (6). An insulating cotton (7) is arranged between the metal shell (6) and the wire threading ceramic assembly.

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