Heat exchanger pipe joint welding preheating heat preservation windproof device

Abstract

The utility model relates to the field of auxiliary welding equipment for heat exchanger pipe joints made of large-diameter special materials in a low-temperature climatic environment, in particular to a preheating heat-preservation windproof device for welding of heat exchanger pipe joints, which comprises a plurality of roller carriers used for placing the heat exchanger pipe joints. The roller carriers are axially arranged along the pipe joint of the heat exchanger, and the device is characterized by further comprising a windproof heat preservation shed, and the roller carriers are all arranged in the windproof shed; two welding platforms are further arranged in the windproof heat preservation shed, the rolling wheel frame is arranged in the area between the two welding platforms, and grounding wires are arranged on the welding platforms. Rotation welding operation of the pipe joint of the heat exchanger is achieved through the welding platform, the temperature in the windproof greenhouse is kept through the arranged heating device, the windproof greenhouse is used for integrally surrounding the manufactured heat exchanger, the welding process is met, and the welding quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of welding auxiliary equipment for heat exchanger pipe joints made of large diameter special materials in a low temperature climate environment, and in particular to a heat exchanger pipe joint welding preheating, heat preservation and windproof device. Background Art

[0002] With the trend of large-scale pressure vessels and complex processes, the requirements for the types, specifications, materials and quality of heat exchangers are constantly increasing. In low-temperature climates, the following problems will occur when welding heat exchanger pipe joints made of large-diameter special materials (such as S22053 materials): The control of the interlayer temperature of the pipe joint welding is extremely important. The second layer of weld is heated to the first layer of weld. If the interlayer temperature exceeds the limit, σ phase is very likely to appear. The generation of σ phase will greatly reduce the corrosion resistance and ductility of the weld. Where possible, try to use low line energy and high heat input, so that the time spent above the ferrite solid solution line is too long, causing significant grain growth. The cooling rate can be controlled by preheating temperature to obtain the desired microstructure. The preheating temperature should not be lower than 15°C, but not higher than 38°C. The particularity of S22053 pipe joint welding designs a heat exchanger pipe joint welding preheating insulation and windproof device to avoid welding joint pores and ensure that the welding environment temperature is within the range of 15~38°C. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a heat exchanger pipe joint welding preheating insulation and windproof device with a simple structure, which can effectively prevent welding due to excessive wind speed and maintain the welding environment temperature to meet the process requirements.

[0004] The utility model discloses a heat exchanger pipe joint welding preheating insulation windproof device, comprising a plurality of roller frames for placing the heat exchanger pipe joints, the roller frames being arranged along the axial direction of the heat exchanger pipe joints, and also comprising a windproof insulation shed, wherein the roller frames are all arranged in the windproof shed;

[0005] Two welding platforms are also arranged in the windproof and heat-insulating shed, the roller frame is arranged in the area between the two welding platforms, grounding wires are arranged on the welding platforms, and the distance between the two welding platforms is greater than the length of the heat exchanger pipe joint;

[0006] A heating device is also provided in the area between the two welding platforms. The heating device includes a heating support platform, on which thermal insulation cotton is laid, a heating plate is provided on the thermal insulation cotton, and a thermocouple connected to a power supply is arranged on the heating plate.

[0007] Preferably, two roller frames are provided, and the heating device is provided between the two roller frames.

[0008] Preferably, the height of the welding platform is higher than the minimum distance between the heat exchanger pipe joint and the ground after the heat exchanger pipe joint is placed on the roller frame, and the height difference is not less than 100 mm.

[0009] Preferably, the height of the heating support platform is less than the minimum distance between the heat exchanger pipe joint and the ground after the heat exchanger pipe joint is placed on the roller frame.

[0010] Preferably, the windproof and heat-insulating shed comprises a plurality of supporting columns and a plurality of connecting rods connected to the tops of the supporting columns, and the peripheral surfaces of the supporting columns and the tops of the connecting rods are surrounded by tarpaulins to form a heat-insulating and windproof area.

[0011] The utility model utilizes a welding platform to realize the rotation welding operation of the heat exchanger pipe joint, utilizes a set heating device to realize the maintenance of the temperature in the windproof shed, and the windproof heat preservation shed is used for the heat exchanger manufactured by integrally surrounding, which is conducive to meeting the welding process and ensuring the welding quality.

[0012] The environmental temperature in the windproof shed of the utility model meets the requirements of the welding process. The utility model is easy to operate, convenient for welding, convenient for heating, and the temperature in the windproof shed can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model.

[0014] Figure 2 for Figure 1 Left view of .

[0015] Figure numerals: 1- windproof and heat-insulating shed, 2- workpiece to be processed, 3- roller frame, 4- welding platform, 5- heating support platform, 6- heat-insulating cotton, 7- heating plate, 8- thermocouple, 9- grounding wire. DETAILED DESCRIPTION

[0016] The utility model discloses a heat exchanger pipe joint welding preheating insulation windproof device, comprising a plurality of roller frames 3 for placing the heat exchanger pipe joints, the roller frames 3 being arranged along the axial direction of the heat exchanger pipe joints, and also comprising a windproof insulation shed 1, wherein the roller frames 3 are all arranged in the windproof shed;

[0017] Two welding platforms 4 are also arranged in the windproof and heat-insulating shed 1, and the roller frame 3 is arranged in the area between the two welding platforms 4. A grounding wire 9 is arranged on each welding platform 4, and the distance between the two welding platforms 4 is greater than the length of the heat exchanger pipe joint;

[0018] The area between the two welding platforms 4 is also provided with a heating device, which includes a heating support platform 5, on which thermal insulation cotton 6 is laid, on which a heating plate 7 is provided, and on which a thermocouple 8 connected to a power supply is arranged.

[0019] Two roller frames 3 are provided, and the heating device is provided between the two roller frames 3 .

[0020] The height of the welding platform 4 is higher than the minimum distance between the heat exchanger pipe joint and the ground after the heat exchanger pipe joint is placed on the roller frame 3, and the height difference is not less than 100 mm.

[0021] The height of the heating support platform 5 is smaller than the minimum distance between the heat exchanger pipe joint and the ground after the heat exchanger pipe joint is placed on the roller frame 3 .

[0022] The windproof and heat-insulating shed 1 comprises a plurality of supporting columns and a plurality of connecting rods connected to the tops of the supporting columns. The peripheral surfaces of the supporting columns and the tops of the connecting rods are surrounded by tarpaulins to form a heat-insulating and windproof area.

[0023] The working process of the utility model is:

[0024] The workpiece 2, i.e., the heat exchanger equipment, is placed on the roller frame 3 for free rotation, and the heat exchanger equipment and the roller frame 3 are enclosed as a whole by the windproof and heat-insulating shed 1. The welding platform 4 is directly opposite to the welding surface of the pipe head of the heat exchanger equipment placed on the roller frame 3. The height of the welding platform 4 is the height of the bottom of the flange of the tube sheet of the heat exchanger shell placed on the roller frame 3 from the ground plus 100mm, the length is 300mm on both sides of the heat exchanger diameter, and the width is 1500mm. No less than 2 grounding wires 9 are set under each leg of the welding platform 4. A heating support platform 5 is set, the height of the heating support platform 5 is less than the height of the welding platform 4, and insulation cotton 6 is placed on the support platform of the heating plate 7, and a heating plate 7 is placed on the insulation cotton 6. Two thermocouples 8 are arranged on each group of heating plates 7.

Claims

1. A heat exchanger pipe joint welding preheating insulation windproof device, comprising a plurality of roller frames for placing the heat exchanger pipe joints, the roller frames are arranged along the axial direction of the heat exchanger pipe joints, It is characterized in that It also includes a windproof and heat-insulating shed, in which the roller frames are arranged; Two welding platforms are also arranged in the windproof and heat-insulating shed, the roller frame is arranged in the area between the two welding platforms, grounding wires are arranged on the welding platforms, and the distance between the two welding platforms is greater than the length of the heat exchanger pipe joint; A heating device is also provided in the area between the two welding platforms. The heating device includes a heating support platform, on which thermal insulation cotton is laid, a heating plate is provided on the thermal insulation cotton, and a thermocouple connected to a power supply is arranged on the heating plate.

2. A heat exchanger pipe joint welding preheating insulation windproof device as claimed in claim 1, It is characterized in that The number of roller frames is two, and the heating device is arranged between the two roller frames.

3. A heat exchanger pipe joint welding preheating insulation windproof device as claimed in claim 2, It is characterized in that The height of the welding platform is higher than the minimum distance between the heat exchanger pipe joint and the ground after the heat exchanger pipe joint is placed on the roller frame, and the height difference is not less than 100 mm.

4. A heat exchanger pipe joint welding preheating insulation windproof device as claimed in claim 3, It is characterized in that The height of the heating support platform is less than the minimum distance between the heat exchanger pipe joint and the ground after the heat exchanger pipe joint is placed on the roller frame.

5. A heat exchanger pipe joint welding preheating insulation windproof device as claimed in claim 1, It is characterized in that The windproof and heat-insulating shed comprises a plurality of supporting columns and a plurality of connecting rods connected to the tops of the supporting columns. The peripheral surfaces of the supporting columns and the tops of the connecting rods are surrounded by tarpaulins to form a heat-insulating and windproof area.

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