Novel crawler-type resistance heater

Abstract

The utility model relates to a novel crawler-type resistance heater, which comprises an insulating wrapping belt, two sides of the bottom of the insulating wrapping belt are respectively connected with an insulating leading-in belt and an insulating leading-out belt, a leading-in resistance wire is arranged in the insulating leading-in belt, a leading-out resistance wire is arranged in the insulating leading-out belt, and a heating resistance wire is arranged in the insulating wrapping belt in a bending manner. The two ends of the heating resistance wire are connected with the leading-in resistance wire and the leading-out resistance wire respectively, and the diameter of the middle position of the heating resistance wire is smaller than that of the two edge positions. The diameter of the middle position of the heating resistance wire is half of the diameter of the two edge positions. And the diameter of the heating resistance wire is the same as that of the lead-in resistance wire and the lead-out resistance wire. And connecting ports communicated with the leading-in resistance wire and the leading-out resistance wire are arranged at the end parts of the insulating leading-in belt and the insulating leading-out belt. The heat treatment device is used for heat treatment of special weld joints with high weld joint hardness and low base metal hardness, and the effect that only the hardness of the weld joints is reduced and the hardness of the base metal is almost unchanged in heat treatment work is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of post-weld heat treatment, in particular to a novel crawler-type resistance heater. Background Art

[0002] At present, high alloy pipelines in thermal power plants, such as P91 / 92 main steam pipelines, need to be post-weld heat treated after welding to achieve uniform structure and reduce stress. The most direct manifestation of heat treatment effect is hardness. The purpose of heat treatment is only to reduce the hardness of the weld. However, the hardness of the weld is high while the hardness of the parent material is low. The existing heaters reduce the hardness of the parent material while processing the hardness of the weld, and cannot achieve the purpose of only reducing the hardness of the weld, resulting in a great impact on the quality of the parent material. Utility Model Content

[0003] The utility model aims to solve the deficiencies of the prior art and provides a novel crawler type resistance heater.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A novel crawler type resistance heater comprises an insulating wrapping belt, wherein both sides of the bottom of the insulating wrapping belt are respectively connected with an insulating lead-in belt and an insulating lead-out belt, an lead-in resistance wire is arranged in the insulating lead-in belt, an lead-out resistance wire is arranged in the insulating lead-out belt, a heating resistance wire is arranged in a bend in the insulating wrapping belt, both ends of the heating resistance wire are respectively connected with the lead-in resistance wire and the lead-out resistance wire, and the diameter of the middle position of the heating resistance wire is smaller than the diameter of the two edge positions.

[0006] The diameter of the middle position of the heating resistance wire is half of the diameter of the two edge positions.

[0007] The diameter of the heating resistance wire is the same as the diameter of the inlet resistance wire and the outlet resistance wire.

[0008] The ends of the insulating lead-in belt and the insulating lead-out belt are provided with connection ports which are connected with the lead-in resistance wire and the lead-out resistance wire.

[0009] The insulating wrap is a crawler-type structure consisting of a plurality of rows of heating belts connected in sequence from top to bottom, and each heating belt is composed of a plurality of heating plates.

[0010] The heating plates between adjacent heating belts are arranged in a staggered manner.

[0011] The beneficial effect of the utility model is that the utility model is used for heat treating special welds with high hardness of the weld and low hardness of the base material, and the heat treatment work only reduces the hardness of the weld, while the hardness of the base material remains almost unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the utility model when in use;

[0014] In the figure: 1-insulating wrapping tape; 2-insulating lead-in tape; 3-insulating lead-out tape; 4-lead-in resistance wire; 5-lead-in resistance wire; 6-heating resistance wire; 7-connection port; 8-heated pipe; 9-weld; 101-heating plate;

[0015] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0017] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] A new type of crawler type resistance heater, such as Figure 1 As shown, it includes an insulating wrapping tape 1, an insulating lead-in tape 2, an insulating lead-out tape 3, an lead-in resistance wire 4, an lead-in resistance wire 5, a heating resistance wire 6 and a connection port 7.

[0021] The insulating lead-in tape 2 and the insulating lead-out tape 3 are respectively connected to the two sides of the bottom of the insulating wrapping tape 1. The insulating lead-in tape 2 is provided with a lead-in resistance wire 4, and the insulating lead-out tape 3 is provided with a lead-out resistance wire 5. A heating resistance wire 6 is bent inside the insulating wrapping tape 1. The two ends of the heating resistance wire 6 are respectively connected to the lead-in resistance wire 4 and the lead-out resistance wire 5. The diameter of the middle position of the heating resistance wire 6 is smaller than the diameter of the two edge positions. The ends of the insulating lead-in tape 2 and the insulating lead-out tape 3 are provided with connection ports 7 connected to the lead-in resistance wire 4 and the lead-out resistance wire 5.

[0022] The insulating wrap 1 is a crawler-type structure composed of a plurality of rows of heating belts connected in sequence from top to bottom. Each heating belt is composed of a plurality of heating plates 101 , and the heating plates 101 between adjacent heating belts are arranged alternately.

[0023] The diameter of the middle position of the heating resistance wire 6 is half of the diameter of the two edge positions.

[0024] The diameter of the heating resistance wire 6 is the same as the diameter of the inlet resistance wire 4 and the outlet resistance wire 5 .

[0025] When the utility model is used, the insulating tape 1 is wrapped around the periphery of the heated pipe 8, the portion with a smaller diameter in the middle of the heating resistance wire 6 is arranged correspondingly outside the weld 9, and the portion with a larger diameter is arranged correspondingly on the portion of the parent material, such as Figure 2 As shown, the resistance of the middle part of the heating resistance wire 6 is about twice the edge resistance. Due to the series relationship, the power of the middle part is about twice the edge power during heating, and more heat is generated, so that the heat treatment is concentrated on the position of the weld 9 to avoid excessive treatment of other positions of the base material.

[0026] The utility model is used for heat treating a special weld with high hardness of the weld 9 and low hardness of the base material, and achieves the effect that the heat treatment work only reduces the hardness of the weld 9 and the hardness of the base material remains almost unchanged.

[0027] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A new type of crawler type resistance heater, characterized in that: The insulating wrapping tape (1) comprises an insulating lead-in tape (2) and an insulating lead-out tape (3) respectively connected to the two sides of the bottom of the insulating wrapping tape (1); an lead-in resistance wire (4) is arranged in the insulating lead-out tape (2); an lead-out resistance wire (5) is arranged in the insulating lead-out tape (3); a heating resistance wire (6) is arranged in a bend in the insulating wrapping tape (1); two ends of the heating resistance wire (6) are respectively connected to the lead-in resistance wire (4) and the lead-out resistance wire (5); and the diameter of the middle position of the heating resistance wire (6) is smaller than the diameter of the two edge positions.

2. A novel crawler-type resistance heater according to claim 1, characterized in that: The diameter of the middle position of the heating resistance wire (6) is half of the diameter of the two edge positions.

3. A novel crawler-type resistance heater according to claim 2, characterized in that: The diameter of the heating resistance wire (6) is the same as the diameter of the inlet resistance wire (4) and the outlet resistance wire (5).

4. A novel crawler-type resistance heater according to claim 3, characterized in that: The ends of the insulating lead-in belt (2) and the insulating lead-out belt (3) are provided with connection ports (7) which are in communication with the lead-in resistance wire (4) and the lead-out resistance wire (5).

5. A novel crawler-type resistance heater according to claim 4, characterized in that: The insulating wrapping tape (1) is a crawler-type structure composed of a plurality of rows of heating tapes connected in sequence from top to bottom, and each heating tape is composed of a plurality of heating plates (101).

6. A novel crawler-type resistance heater according to claim 5, characterized in that: The heating plates (101) between adjacent heating belts are arranged in a staggered manner.

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