Welding seam preheating device

Abstract

The utility model discloses a weld preheating device, comprising a main pipe, a plurality of nozzles, a pipe connection, a hose and a gas regulating device, wherein the main pipe is a U-shaped pipe or a circular pipe that is not connected at the head and tail, a sealing plate is provided at the open end of the main pipe, a plurality of nozzles are arranged on the main pipe at intervals, the pipe connection connects the main pipe and the hose, the hose is connected to an external gas supply device, and the gas regulating device is used to regulate the amount of gas flowing from the hose to the pipe connection. In the utility model, the straight seam of the cylinder, the annular seam of the cylinder and the inserted pipe connection can be preheated without the need for multiple people to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, in particular to a welding seam preheating device. Background Art

[0002] In the welding and manufacturing of steel pressure vessels, it is often necessary to preheat and post-heat the weldment to prevent the occurrence of welding cracks, which is the key to the welding process. Preheating before welding can reduce the cooling rate of the weld, prevent the formation of hardened structure in the joint, and produce cold cracks; preheating weldments with large constraints can reduce shrinkage stress and prevent cracks. Post-heating can slow down the cooling of the welded joint or dehydrogenate the weld to diffuse the hydrogen in the weld and prevent hydrogen-induced cracks.

[0003] Commonly used preheating and post-heating methods include overall heating in the furnace, flame heating, infrared heating, and power frequency induction heating. Due to the complex structure of steel pressure vessels, considering the feasibility of welding operations, local flame heating is used. The commonly used heating tool for this method is a drying gun, which is heated by burning natural gas or oxyacetylene gas; the operator needs to hold the drying gun back and forth to bake. If the weld is long, multiple drying guns are often required to heat at the same time and multiple people are required to operate at the same time, which is very inconvenient. Utility Model Content

[0004] The purpose of the utility model is to solve the above technical problems and provide a weld preheating device.

[0005] The technical solution of the utility model is as follows: a weld preheating device, comprising a main pipe, a plurality of nozzles, a connecting pipe, a hose and a gas regulating device, wherein the main pipe is a U-shaped pipe or a circular pipe that is not connected at the head and tail, a sealing plate is provided at the open end of the main pipe, a plurality of nozzles are arranged on the main pipe at intervals, the connecting pipe connects the main pipe and the hose, the hose is connected to an external gas supply device, and the gas regulating device is used to regulate the amount of gas flowing from the hose to the connecting pipe.

[0006] Preferably, the gas regulating device includes a sleeve, two pressure plates and a driving device, one end of the connecting pipe and one end of the hose are both arranged in the sleeve, the two pressure plates are symmetrically arranged on the sleeve and can slide up and down relative to the sleeve, and the driving device is used to drive the pressure plates to move up and down.

[0007] Preferably, the sleeve is provided with two slide grooves, and one end of the pressing plate can slide in the slide grooves.

[0008] Preferably, the top of the pressure plate is an inclined surface; the driving device includes an outer tube, a screw cover and a pressure tube, the outer tube is sleeved on the sleeve, the screw cover is threadedly connected to the outer tube, a through hole is provided on the screw cover, the pressure tube is arranged in the screw cover and the inner wall surface of the pressure tube is an inclined surface.

[0009] Preferably, the screw cap is provided with anti-slip patterns.

[0010] The beneficial effect of the utility model is that the utility model can preheat the straight seam of the cylinder, the annular seam of the cylinder and the inserted pipe without the need for multiple people to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of the preferred embodiment of the utility model in which the main pipe is a U-shaped straight pipe connected to the gas regulating device;

[0012] Figure 2 It is a top view of the main pipe in the preferred embodiment of the utility model, which is a U-shaped straight pipe connected to the gas regulating device;

[0013] Figure 3 This is a front view of the preferred embodiment of the utility model in which the main pipe is a U-shaped arc pipe connected to the gas regulating device;

[0014] Figure 4 It is a front view of the connection between the main pipe, which is a circular pipe that is not connected end to end, and the gas regulating device in the preferred embodiment of the utility model;

[0015] Figure 5 It is a top view of the connection between the main pipe, which is a circular pipe that is not connected end to end, and the gas regulating device in the preferred embodiment of the utility model;

[0016] Figure 6 This is a schematic diagram of the gas regulating device in the preferred embodiment of the utility model;

[0017] Figure 7 It is a cross-sectional view of the connection between the sleeve and the pressing plate in the preferred embodiment of the utility model;

[0018] Figure 8 It is a schematic diagram of a compression tube in a preferred embodiment of the utility model.

[0019] Reference numerals: main pipe 10 , sealing plate 101 , nozzle 2 , connecting pipe 3 , hose 4 , sleeve 5 , slide groove 501 , pressing plate 6 , outer pipe 7 , screw cap 8 , pressing pipe 9 . DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Reference Figures 1 to 8A weld preheating device comprises a main pipe 10, a plurality of nozzles 2, a connecting pipe 3, a hose 4 and a gas regulating device, wherein the main pipe 10 is a U-shaped pipe or a circular pipe that is not connected at the head and tail, a sealing plate 101 is provided at the open end of the main pipe 10, a plurality of nozzles 2 are arranged on the main pipe 10 at intervals, the connecting pipe 3 connects the main pipe 10 and the hose 4, the hose 4 is connected to an external gas supply device, and the gas regulating device is used to adjust the amount of gas flowing from the hose 4 to the connecting pipe 3. In the utility model, when the cylinder weld is a straight seam, the main pipe 10 is a U-shaped pipe and a straight pipe, the external gas supply equipment supplies natural gas to the hose 4, the gas flows into the main pipe 10, and ignition can achieve heating. When the cylinder weld is a circumferential seam, the main pipe 10 is a U-shaped pipe and an arc-shaped pipe, the external gas supply equipment supplies natural gas to the hose 4, the gas flows into the main pipe 10, and ignition can achieve heating. When the cylinder is connected to the external pipeline, that is, an inserted pipe, the weld at the connection needs to be preheated, the main pipe 10 is a circular pipe that is not connected at the head and tail, and the main pipe 10 can be passed through the external pipeline. The external gas supply equipment supplies natural gas to the hose 4, the gas flows into the main pipe 10, and ignition can achieve heating. The gas regulating device regulates the amount of gas flowing from the hose 4 to the pipe 3, thereby regulating the size of the flame to control the size of the heating temperature. The device can preheat the cylinder straight seam, the cylinder circumferential seam and the inserted pipe, and does not require multiple people to operate.

[0022] As a preferred embodiment of the utility model, it may also have the following additional technical features:

[0023] In this embodiment, the gas regulating device includes a sleeve 5, two pressure plates 6 and a driving device. One end of the connecting pipe 3 and one end of the hose 4 are both arranged in the sleeve 5. The two pressure plates 6 are symmetrically arranged on the sleeve 5 and can slide up and down relative to the sleeve 5. The driving device is used to drive the pressure plates 6 to move up and down. When it is necessary to reduce the air intake of the regulating hose 4, the driving device drives the two pressure plates 6 to move closer to each other. The two pressure plates 6 squeeze the hose 4, and the internal channel of the hose 4 becomes smaller, thereby reducing the air intake of the hose 4. When it is necessary to increase the air intake of the regulating hose 4, the driving device drives the two pressure plates 6 to move in the opposite direction. The two pressure plates 6 move away from each other, and the internal channel of the hose 4 becomes larger due to the action of the gas, thereby increasing the air intake of the hose 4.

[0024] In this embodiment, two slide grooves 501 are provided on the sleeve 5 , and one end of the pressing plate 6 can slide in the slide groove 501 , and the pressing plate 6 can move up and down in the slide groove 501 .

[0025] In this embodiment, the top end of the pressing plate 6 is an inclined surface; the driving device includes an outer tube 7, a screw cover 8 and a pressing tube 9, the outer tube 7 is sleeved on the sleeve 5, the screw cover 8 is screwed to the outer tube 7, a through hole is provided on the screw cover 8, the pressing tube 9 is arranged in the screw cover 8 and the inner wall surface of the pressing tube 9 is an inclined surface, the top end of the pressing plate 6 abuts against the inner wall of the pressing tube 9 and is a matching inclined surface, the pressing tube 9 is moved to the left or right by rotating the screw cover 8, and then the pressing plate 6 is driven to move up and down, thereby realizing the control of the air intake amount of the hose 4.

[0026] In this embodiment, the screw cap 8 is provided with anti-slip grooves to facilitate the rotation of the screw cap 8.

[0027] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A weld preheating device, characterized in that: The invention comprises a main pipe (10), a plurality of nozzles (2), a connecting pipe (3), a hose (4) and a gas regulating device, wherein the main pipe (10) is a U-shaped pipe or a circular pipe whose ends are not connected, a sealing plate (101) is provided at the open end of the main pipe (10), a plurality of nozzles (2) are arranged at intervals on the main pipe (10), the connecting pipe (3) connects the main pipe (10) and the hose (4), the hose (4) is connected to an external gas supply device, and the gas regulating device is used to regulate the amount of gas flowing from the hose (4) to the connecting pipe. The gas regulating device comprises a sleeve (5), two pressure plates (6) and a driving device. One end of the connecting pipe (3) and one end of the hose (4) are both arranged in the sleeve (5). The two pressure plates (6) are symmetrically arranged on the sleeve (5) and can slide up and down relative to the sleeve (5). The driving device is used to drive the pressure plates (6) to move up and down. Two sliding grooves (501) are provided on the sleeve (5). One end of the pressure plate (6) can slide in the sliding groove (501).

2. A weld preheating device according to claim 1, characterized in that: The top end of the pressing plate (6) is an inclined surface; the driving device comprises an outer tube (7), a screw cover (8) and a pressing tube (9); the outer tube (7) is sleeved on the sleeve (5); the screw cover (8) is screwed to the outer tube (7); a through hole is provided on the screw cover (8); the pressing tube (9) is arranged inside the screw cover (8) and the inner wall surface of the pressing tube (9) is an inclined surface.

3. A weld preheating device according to claim 2, characterized in that: The screw cap (8) is provided with anti-slip patterns.

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