Mold heating device in production of thermoplastic cable protection pipe

Abstract

The utility model relates to the technical field of thermoplastic cable protection equipment, in particular to a mold heating device in thermoplastic cable protection pipe production, which comprises a mold, a heat preservation layer arranged on the outer layer of the mold and a heating device arranged outside the heat preservation layer, and is characterized in that the heating device comprises two semicircular ring frameworks with the same structure; the semi-circular ring frameworks are made of insulating materials, positioning holes are formed in the two ends of each semi-circular ring framework respectively, fixing bolts penetrate through the positioning holes to buckle the two semi-circular ring frameworks into a circular ring, a plurality of coil pieces are arranged on each semi-circular ring framework, and the coil pieces are arranged in a circumferential array along the axis center of the circular ring. Wherein the front coil piece and the rear coil piece are sequentially connected in series through a wire, and the coil pieces connected in series and an external power supply form a loop through a wire. By adopting the design of the concentric-square-shaped coil piece, the coil is more convenient to disassemble and assemble, and the defect that a winding type coil is difficult to disassemble and assemble is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of thermoplastic cable protection equipment, in particular to a mold heating device in the production of thermoplastic cable protection tubes. Background Art

[0002] At present, in the production and molding process of thermoplastic cable protection tubes, electric heating wire structure is usually used for heating, that is, a mica skeleton is used to wrap the heating wire, and then a mica sheet is covered to protect the heating wire, and finally it is wrapped with a metal layer.

[0003] This structure has the following shortcomings: 1. The heating wire is hidden inside and needs to pass through the insulating plate and metal layer before heating the object, which is inefficient; 2. The heating wire has a short lifespan and is coated with layers, which has poor heat dissipation and is prone to local overheating, which in turn causes local thermal runaway and damage to the heating plate. 3. The heating wire heats up through the insulating layer and the metal coating layer, and then transfers the heat to the heated component by conduction, which has low thermal efficiency and high energy consumption. At the same time, due to the long conduction path, the temperature control accuracy is poor.

[0004] Based on this, a mold heating device for the production of thermoplastic cable protection tubes is specially designed. Utility Model Content

[0005] The utility model aims to solve the above problem and provides a mold heating device for the production of thermoplastic cable protection tubes.

[0006] The utility model is realized through the following technical scheme: a mold heating device in the production of thermoplastic cable protection tubes, comprising a mold, an outer layer of the mold is provided with an insulation layer, and a heating device is provided outside the insulation layer, characterized in that the heating device comprises two semi-circular ring skeletons with the same structure, the semi-circular ring skeletons are made of insulating material, and positioning holes are respectively provided at both ends of each semi-circular ring skeleton, and fixing bolts pass through the positioning holes to buckle the two semi-circular ring skeletons into a circular ring, and each of the semi-circular ring skeletons is provided with a plurality of coil sheets, and the coil sheets are arranged in a circular array along the axial center of the circular ring, wherein the front and rear coil sheets are connected in series in sequence through wires, and the series-connected coil sheets form a loop with an external power supply through the wires.

[0007] Furthermore, the coil sheet adopts a U-shaped design.

[0008] The beneficial effect of the utility model is that the utility model is more convenient to disassemble and assemble by adopting the design of the U-shaped coil sheet, and avoids the disadvantage of difficult disassembly and assembly in the winding coil.

[0009] The utility model can make the coil sheet into various special-shaped structures, which can avoid the surface parts of the workpiece to be heated and effectively utilize the surface area of ​​the workpiece to be heated.

[0010] The utility model has high efficiency. Compared with the traditional electric heating wire heating, the efficiency of the utility model is improved by more than 25%.

[0011] The utility model arranges a heat preservation layer between the heating device and the mold tube, which can heat the workpiece in the heat preservation layer to avoid heat loss of the internal workpiece; on the other hand, the external heating coil is not affected by high temperature and maintains a low working temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 This is a schematic diagram of the structure of the heating device of the utility model.

[0014] In the accompanying drawings, 1 is a mold, 2 is a heat-insulating layer, 3 is a heating device, 301 is a semicircular ring skeleton, 302 is a positioning hole, 303 is a coil sheet, and 304 is a wire. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the technical solution of the present invention is further described below in conjunction with embodiments.

[0016] like Figure 1 to Figure 2 As shown, a mold 1 heating device 3 in the production of a thermoplastic cable protection tube comprises a mold 1, an outer layer of the mold 1 is provided with a heat-insulating layer 2, the heat-insulating layer 2 can effectively avoid heat loss, and a heating device 3 is provided outside the heat-insulating layer 2.

[0017] 1. The heating device 3 includes two semi-circular ring skeletons 301 with the same structure. Positioning holes 302 are respectively provided at both ends of each semi-circular ring skeleton. The fixing bolts pass through the positioning holes 302 to buckle the two semi-circular ring skeletons 301 into a circular ring and clamp them outside the insulation layer 2. Each semi-circular ring skeleton 301 is provided with a plurality of coil sheets 303. The coil sheets 303 are designed in a U-shaped shape. The coil sheets 303 are arranged in a circular array along the axis center of the circular ring, wherein the front and rear coil sheets 303 are connected in series in sequence through wires 304, and the series-connected coil sheets 303 form a loop with an external power supply through the wires 304.

[0018] The aforementioned semi-circular ring framework 301 is made of insulating material.

[0019] The utility model utilizes the principle of electromagnetic induction, that is, a coil is connected to an external high-frequency alternating current. When the current flows through the coil, the coil generates an alternating magnetic field. The object to be heated close to the coil will cut the magnetic lines of force and generate alternating current, i.e., eddy current, in the object to be heated. The eddy current causes the iron atoms inside the electric heating body to move at high speed and disorderly, and the atoms collide and rub against each other, thereby generating heat energy, which is used to heat the mold 1.

[0020] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art.

Claims

1. A mold heating device in the production of thermoplastic cable protection pipes, comprising a mold (1), an insulating layer (2) is provided on the outer layer of the mold (1), and a heating device (3) is provided outside the insulating layer (2). It is characterized in that the heating device (3) includes two semi-circular frames (301) with the same structure. The semi-circular frames (301) are made of insulating materials. Positioning holes (302) are respectively provided at both ends of each semi-circular frame. Fixed bolts pass through the positioning holes (302) to fasten the two semi-circular frames (301) into a ring. A number of coil sheets (303) are provided on each semi-circular frame (301). The coil sheets (303) are arranged in a circular array along the axis center of the ring. Among them, the front and rear coil sheets (303) are sequentially connected in series through wires (304). The connected coil sheets (303) form a loop with an external power supply through wires (304).

2. The mold heating device in the production of thermoplastic cable protection pipes according to claim 1 It is characterized in that the coil sheet (303) adopts a square-within-a-square design.

Images