Hoop type expandable pipeline welding seam heat treatment tool

Abstract

The hoop type expandable pipeline weld joint heat treatment tool comprises a first aluminum silicate felt, the inner side of the first aluminum silicate felt is fixedly connected with a plurality of crawler-type heaters, one end of the first aluminum silicate felt is fixedly connected with a fixing rod, the two ends of the fixing rod are fixedly connected with hose clamps, and the hose clamps are fixedly connected with the crawler-type heaters. The tool comprises a first connecting pipe, an opening is formed in the circumferential face of the first connecting pipe, and the first aluminum silicate felt penetrates through the opening in the axial direction of the first assembling rod, so that the first assembling rod is matched with the interior of the first connecting pipe; the end of the fixing rod is fixedly connected with a rope hook, and a rope is wound around the end of the rope hook and the end of the first connecting pipe so that the rope hook and the first connecting pipe can be fixed. The device is fixed on a pipeline, is simple to operate, and can be suitable for heat treatment of pipelines with different pipe diameters.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline welding, and in particular to a hoop-type expandable pipeline weld heat treatment tool. Background Art

[0002] Chromium-molybdenum alloy steel is a kind of alloy steel with chromium and molybdenum as the main elements. The addition of chromium can improve the oxidation resistance, corrosion resistance and wear resistance of steel, and molybdenum element helps to enhance the high temperature strength, toughness and creep resistance of steel. However, chromium-molybdenum steel pipelines are prone to cracks and other quality problems during construction. In order to ensure the construction quality of chromium-molybdenum steel pipelines, during the welding construction of chromium-molybdenum alloy steel pipelines, strict measures are taken in terms of welding material use and management, preheating before welding, control during welding, post-weld heat treatment and non-destructive testing, so as to ensure the welding quality of this type of alloy steel.

[0003] After welding, high-temperature tempering treatment of the pipeline can reduce the hardness of the weld joint, promote the escape of hydrogen from the welding area, stabilize the structure, and improve the mechanical and high-temperature properties. At the same time, high-temperature tempering can also eliminate the residual stress of the weld joint, that is, heat treatment can improve the quality of the pipeline weld.

[0004] The tools used in the welding heat treatment at the construction site are relatively simple. Heaters are pre-arranged on the side wall of the pipe, usually several heating wires with temperature monitoring thermocouples, and then wrapped with insulation materials, and finally tied with multiple steel wires. This operation method is not only difficult to operate, but also very easy to cause uneven thickness of insulation materials and misalignment of heaters due to the curved surface of the pipe, resulting in uneven heat treatment. Summary of the invention

[0005] In order to solve the above problems, the present invention discloses a hoop-type expandable pipeline weld heat treatment tool, comprising a first aluminum silicate felt, and a plurality of crawler heaters are fixedly connected to the inner side of the first aluminum silicate felt. The crawler heater is an existing device, so it is not introduced in detail. It is used for pipeline heating here, and the first aluminum silicate felt is used for heat preservation, so as to improve the quality of pipeline welding through heat treatment.

[0006] One end of the first aluminum silicate felt is fixedly connected to a fixing rod, and both ends of the fixing rod are fixedly connected to a throat clamp. The throat clamp is used to be tied to the pipeline. At this time, one end of the first aluminum silicate felt is fixed by the fixing rod, which is convenient for the other end to be wound on the pipeline.

[0007] The other end of the first aluminum silicate felt is fixedly connected to a first assembly rod. The tooling includes a first connecting tube. The circumferential surface of the first connecting tube is provided with an opening, and the first aluminum silicate felt passes through the opening along the axial direction of the first assembly rod, so that the first assembly rod fits inside the first connecting tube. The end of the fixing rod is fixedly connected to a rope hook, and a rope is wound around the rope hook and the end of the first connecting tube to fix the two. The other end of the first aluminum silicate felt is fixed by means of a rope with the help of the rope hook, so that the first aluminum silicate felt is tightly attached to the pipeline to ensure the thermal insulation performance.

[0008] Furthermore, the rope is passed around the first aluminum silicate felt for several turns to improve the binding effect of the first aluminum silicate felt.

[0009] Preferably, the crawler heater comprises a plurality of ceramic blocks, wherein heating wires and thermocouples are arranged inside the ceramic blocks. In order to ensure that the crawler heater is attached to the surface of the pipeline, a plurality of ceramic blocks are used for splicing, the heating wires are energized to generate heat, and the thermocouples are used to monitor the temperature.

[0010] Preferably, a cable is provided on one side of the ceramic block, and the cable is electrically connected to the heating wire and the thermocouple respectively. The cable has multiple strands, which are used for power supply and signal transmission respectively.

[0011] Preferably, the four corners of the crawler heater are provided with fixing buckles, and the crawler heater is connected to the first aluminum silicate felt by means of the fixing buckles. That is, with this arrangement, multiple crawler heaters are designed, and when heating pipes of different diameters, only the crawler heaters that fit the pipes can be activated, and the fixing buckles can also increase the required number of crawler heaters on the first aluminum silicate felt.

[0012] Preferably, the tooling also includes an extended thermal insulation coil, which includes a second aluminum silicate felt, and the two ends of the second aluminum silicate felt are respectively fixedly connected with a second connecting pipe and a second assembly rod, and the second connecting pipe has the same structure as the first connecting pipe, and the second assembly rod has the same structure as the first assembly rod. Due to the difference in pipe diameters, the first aluminum silicate felt cannot reach the insulation thickness after wrapping the pipe, so an extended thermal insulation coil is provided, and at the same time, the end structures of the first aluminum silicate felt and the second aluminum silicate felt can be spliced ​​with each other, which is convenient for use, and the extended thermal insulation coil ensures the thermal insulation effect of the pipeline heat treatment, thereby reducing energy consumption.

[0013] Preferably, both ends of the first connecting pipe are threadedly connected with nuts to prevent the first connecting pipe from falling off due to the expansion of the opening when the first aluminum silicate felt is pulled, and also prevent the rope from falling off from the end of the first connecting pipe.

[0014] Furthermore, the tooling also includes a device for supplying power to the tracked heater, and a temperature display and a temperature controller are provided on the device.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. Fix one end of the first aluminum silicate felt by a throat clamp and a fixing rod, which is conducive to winding it on the pipeline, and then use a rope to fix the rope hook and the first fixing pipe to achieve the fixation of the other end of the first aluminum silicate felt. This method has the advantages of simple operation, and the thickness of the first aluminum silicate felt coated on the pipeline is uniform. Further, by extending the thermal insulation coil, the coating thickness can be increased to ensure the thermal insulation effect.

[0017] 2. There are multiple crawler heaters set up and fixed on the inner side of the first aluminum silicate felt, which can ensure that when the first aluminum silicate felt covers the pipeline, the side wall of the pipeline can be attached to the crawler heater and the position is correct, ensuring the consistency of heating. Through this setting, post-weld heat treatment can also be performed on pipelines of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the application of the present invention;

[0019] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0020] Figure 3 This is a schematic diagram of the inner side of the first aluminum silicate felt of the present invention;

[0021] Figure 4 It is a schematic diagram of the extended thermal insulation coil of the present invention.

[0022] List of reference numerals:

[0023] 1. Pipeline; 2. Crawler heater; 3. First aluminum silicate felt; 4. First connecting pipe; 5. Hose clamp; 6. Nut; 7. Rope hook; 8. Fixing rod; 9. First assembly rod; 10. Extended insulation coil;

[0024] 21. Cable; 22. Ceramic block; 23. Heating wire; 24. Thermocouple; 25. Fixing buckle; 101. Second connecting tube; 102. Second aluminum silicate felt; 103. Second assembly rod. DETAILED DESCRIPTION

[0025] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0026] like Figures 1 to 3As shown, a hoop-type expandable pipeline weld heat treatment tool includes a first aluminum silicate felt 3, and a plurality of crawler heaters 2 are fixedly connected to the inner side of the first aluminum silicate felt 3. In actual use, the crawler heater 2 is attached to the pipeline 1, and the first aluminum silicate felt 3 is wrapped on the outside to play a role of heat preservation, which can reduce energy consumption and ensure the heat treatment effect.

[0027] One end of the first aluminum silicate felt 3 is fixedly connected to a fixing rod 8, from which the first aluminum silicate felt 3 can be pulled, and both ends of the fixing rod 8 are fixedly connected to a throat hoop 5. In actual construction, the throat hoop 5 is fixed to the pipeline 1 in advance, and the throat hoop 5 is tightened after the position is adjusted. Since one end of the first aluminum silicate felt 3 is fixed, the other end of the first aluminum silicate felt 3 can be pulled and tightly wound around the pipeline 1, and one end of the first aluminum silicate felt 3 is fixed, which reduces the difficulty of winding and ensures the winding effect.

[0028] The other end of the first aluminum silicate felt 3 is fixedly connected to a first assembly rod 9, and the tooling includes a first connecting tube 4, the circumferential surface of the first connecting tube 4 is provided with an opening, and the first aluminum silicate felt 3 passes through the opening axially along the first assembly rod 9, so that the first assembly rod 9 is fitted inside the first connecting tube 4, that is, the first connecting tube 9 can be pulled out from the end of the first aluminum silicate felt 3, and the end of the fixing rod 8 is fixedly connected to a rope hook 7, and a rope is used to be wound around the rope hook 7 and the end of the first connecting tube 4 to fix the two, that is, to achieve a fixed connection of the other end of the first aluminum silicate felt 3, and a further rope can be wound around the first aluminum silicate felt 3.

[0029] The track heater 2 includes several ceramic blocks 22 to ensure that the track heater 2 fits the side wall of the pipeline 1 as closely as possible. A heating wire 23 and a thermocouple 24 are arranged inside the ceramic block 22. The heating wire 23 generates heat when powered, while the thermocouple 24 is used to monitor the temperature. Furthermore, the heating wire 23 can generate heat by high-frequency current, and the pipeline 1 generates induced current.

[0030] A cable 21 is provided on one side of the ceramic block 22 , and the cable 21 is electrically connected to the heating wire 23 and the thermocouple 24 , that is, a plurality of wire cores are provided in the cable 21 , which are divided into two types: power supply and data transmission.

[0031] The four corners of the crawler heater 2 are provided with fixing buckles 25, and the crawler heater 2 is connected to the first aluminum silicate felt 3 by means of the fixing buckles 25. Since the outer diameters of the heat-treated pipes 1 are different, multiple crawler heaters 2 are provided to ensure that only the crawler heaters 2 that are in contact with the outer wall of the pipe 1 work. Due to the buckling method, the number of crawler heaters 2 can be increased or decreased according to the needs of the heat treatment.

[0032] like Figure 4As shown, the tooling also includes an extended thermal insulation coil 10, which is used to extend the first aluminum silicate felt 3 to ensure that the large-diameter pipe 1 can be covered with insulation. The extended thermal insulation coil 10 includes a second aluminum silicate felt 102, and the two ends of the second aluminum silicate felt 102 are respectively fixedly connected with a second connecting pipe 101 and a second assembly rod 13. The second connecting pipe 101 has the same structure as the first connecting pipe 4, and the second assembly rod 9 has the same structure as the first assembly rod 13. When the first aluminum silicate felt 3 and the second aluminum silicate felt 102 are spliced, the second connecting pipe 101 cooperates with the first assembly rod 9, and the second assembly pipe 103 cooperates with the first connecting pipe 101.

[0033] Both ends of the first connecting tube 4 are threadedly connected with nuts 6. This prevents the first connecting tube 4 from being subjected to excessive force, causing the opening to deform excessively, causing the first assembly rod 9 to directly detach from the opening, and also prevents the rope from slipping off the first connecting tube 4 when the rope is tied to the rope hook 7 and the end of the first connecting tube 4.

[0034] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A hoop-type expandable pipeline weld heat treatment tool, characterized in that: It comprises a first aluminum silicate felt (3), wherein a plurality of track-type heaters (2) are fixedly connected to the inner side of the first aluminum silicate felt (3); One end of the first aluminum silicate felt (3) is fixedly connected to a fixing rod (8), and both ends of the fixing rod (8) are fixedly connected to a throat clamp (5); The other end of the first aluminum silicate felt (3) is fixedly connected to a first assembly rod (9), and the tooling comprises a first connecting tube (4), the circumferential surface of the first connecting tube (4) is provided with an opening, and the first aluminum silicate felt (3) passes through the opening along the axial direction of the first assembly rod (9), so that the first assembly rod (9) fits inside the first connecting tube (4), and the end of the fixing rod (8) is fixedly connected to a rope hook (7), and a rope is wound around the rope hook (7) and the end of the first connecting tube (4) to fix the two.

2. The hoop-type expandable pipeline weld heat treatment tool according to claim 1, characterized in that: The crawler-type heater (2) comprises a plurality of ceramic blocks (22), wherein heating wires (23) and thermocouples (24) are arranged inside the ceramic blocks (22).

3. The hoop-type expandable pipeline weld heat treatment tool according to claim 2, characterized in that: A cable (21) is provided on one side of the ceramic block (22), and the cable (21) is electrically connected to a heating wire (23) and a thermocouple (24) respectively.

4. The hoop-type expandable pipeline weld heat treatment tool according to claim 2, characterized in that: The four corners of the track-type heater (2) are provided with fixing buckles (25), and the track-type heater (2) is connected to the first aluminum silicate felt (3) by means of the fixing buckles (25).

5. The hoop-type expandable pipeline weld heat treatment tool according to claim 1, characterized in that: The tooling also includes an extended thermal insulation coil (10), the extended thermal insulation coil (10) including a second aluminum silicate felt (102), the two ends of the second aluminum silicate felt (102) being respectively fixedly connected to a second connecting pipe (101) and a second assembly rod (103), the second connecting pipe (101) and the first connecting pipe (4) having the same structure, and the second assembly rod (103) and the first assembly rod (9) having the same structure.

6. The hoop-type expandable pipeline weld heat treatment tool according to claim 1, characterized in that: Both ends of the first connecting pipe (4) are threadedly connected with nuts (6).

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