A residual stress relieving device for a gas burner cylinder

Abstract

The utility model provides a kind of gas stove cylinder residual stress relieving device, belong to welding residual stress relieving technical field;Including cylinder barrel and the end cover of welding fixed in the end part of cylinder barrel, further include: track type heater, the tack weld of cylinder barrel and end cover is connected at the tack weld where track type heater is wrapped, and track type heater is wrapped with heat insulation cotton;Positioning mechanism, the positioning mechanism includes multiple steel belts wrapped on heat insulation cotton, the both ends of same steel belt are connected by bolt, multiple connecting belts are connected between adjacent two steel belts, and detection assembly is provided on the side of connecting belt away from heat insulation cotton.The utility model is wrapped outside heat insulation layer by setting steel belt and connecting belt, connecting belt is used to increase the contact area of steel belt and heat insulation layer, so that the contact of track type heater and cylinder barrel and end cover is more uniform, guarantee heating uniformly to the position around tack weld, so as to guarantee the elimination effect of residual stress after welding.

Description

Technical Field

[0001] This utility model relates to the field of welding residual stress relief technology, and in particular to a device for relieving residual stress in a gas furnace cylinder. Background Technology

[0002] A gas-fired boiler is a thermal power device that uses combustible gases such as natural gas and liquefied petroleum gas as fuel. It generates heat by mixing fuel with air through a burner, and then transfers the heat to water or other media inside the boiler through a heating surface, ultimately outputting high-temperature steam. The gas distribution cylinder of a gas-fired boiler can collect, buffer, and distribute the high-temperature steam produced by the boiler. The gas distribution cylinder mainly consists of a cylinder barrel and an end cover welded to the end of the cylinder barrel. After the cylinder barrel and the end cover are connected by welding, the weld seam needs to be heated by a tracked heater to eliminate the stress after welding through heat treatment.

[0003] When eliminating welding residual stress at the connection between the cylinder barrel and end cover of the gas distribution cylinder, a tracked heater is often wrapped around the weld, then a layer of insulation cotton is wrapped around the tracked heater, and then the tracked heater is clamped to the weld by wire. The welding residual stress is eliminated by heating. However, when fixing the tracked heater with wire, the wire diameter is small, making the contact between the tracked heater and the gas distribution cylinder relatively tight. However, the tracked heater between adjacent wires is difficult to fit tightly with the gas distribution cylinder, which can easily cause uneven heating around the weld and affect the elimination of post-weld residual stress. Therefore, this application provides a gas furnace cylinder residual stress elimination device to meet the requirements. Utility Model Content

[0004] This utility model provides a residual stress relief device for a gas furnace cylinder to solve the problem that fixing a tracked heater with wire can easily cause uneven heating around the weld, affecting the elimination of residual stress after welding.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A residual stress relief device for a gas furnace cylinder includes a cylinder barrel and an end cap welded and fixed to the end of the cylinder barrel, and further includes: A tracked heater, wherein the tracked heater is wrapped around the weld seam connecting the cylinder and the end cover, and the tracked heater is wrapped with insulation cotton. The positioning mechanism includes multiple steel strips wrapped around the insulation cotton. The two ends of the same steel strip are connected by bolts. Multiple connecting strips connect adjacent steel strips. A detection component is provided on the side of the connecting strip away from the insulation cotton.

[0006] Preferably, the detection assembly includes a cylinder fixed to the side of the connecting belt away from the insulation cotton, a ring slidably connected to the inner wall of the cylinder, a measuring rod fixed to the inner wall of the ring, one end of the measuring rod movably passing through the connecting belt and abutting against the outside of the insulation cotton, the other end of the measuring rod movably passing through the cylinder, a tension spring fixed between the ring and the connecting belt, the tension spring being sleeved on the measuring rod, and scale lines engraved on the measuring rod.

[0007] Preferably, a plane is formed on the circumferential surface of the measuring rod, and the scale lines are formed on the plane.

[0008] Preferably, an arc-shaped band is fixed between two adjacent connecting bands, and the arc-shaped band presses against the outside of the insulation cotton.

[0009] Preferably, the arc-shaped strip has a protrusion integrally formed at the middle position, and the protrusion presses against the outside of the insulation cotton.

[0010] Preferably, a connecting block is fixed to the side of the protrusion, and the connecting block is fixed to the side of the steel strip.

[0011] Preferably, the protrusion has a through groove.

[0012] Preferably, both ends of the arc-shaped strip are integrally formed with extensions, which are fixed to the side of the connecting strip.

[0013] Compared with the prior art, this utility model has at least the following beneficial effects: In the above scheme, by setting steel strips and connecting strips, the steel strips are bound to the outside of the insulation layer, and the connecting strips are used to increase the contact area between the steel strips and the insulation layer, so that the contact between the tracked heater and the cylinder and end cover is more uniform, ensuring uniform heating of the weld perimeter, thereby ensuring the elimination of residual stress after welding.

[0014] By setting up a measuring rod, with one end resting against the insulation layer and the other end protruding from the end of the cylinder, the pressure of the tracked heater at each connecting point can be determined by observing the values ​​corresponding to the cylinder end on the scale lines of different measuring rods. If the values ​​are inconsistent, adjustments can be made in time to further ensure the uniformity of heating around the weld.

[0015] By setting a plane, the scale lines are opened on the plane, preventing wear on the scale lines when the measuring rod extends or retracts, thereby improving the clarity of the scale lines and making it easier for personnel to observe.

[0016] By setting an arc-shaped belt, the contact area between the connecting belt and the insulation layer is increased, thereby making the contact between the tracked heater and the cylinder and end cover more uniform.

[0017] By setting up protrusions and connecting blocks, the contact area between the arc-shaped belt and the insulation layer is increased, making the contact between the tracked heater and the cylinder and end cover more uniform.

[0018] By providing an extension, the contact area between the curved belt and the connecting belt is increased, thereby improving the connection strength between the curved belt and the connecting belt. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the measuring rod of this utility model; Figure 3 This is a cross-sectional view of the thermal insulation cotton part of this utility model; Figure 4 For the present utility model Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is an enlarged three-dimensional view of the arc-shaped section of this utility model.

[0020] In the diagram: 1. Cylinder; 2. End cap; 3. Tracked heater; 4. Insulation cotton; 5. Positioning mechanism; 6. Steel belt; 7. Connecting belt; 8. Arc belt; 9. Protrusion; 10. Extension; 11. Connecting block; 12. Cylinder; 13. Measuring rod; 14. Plane; 15. Ring; 16. Tension spring.

[0021] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to the specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0022] The following is a detailed description of a residual stress relief device for a gas furnace cylinder provided by this utility model, in conjunction with the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; for some known technologies, those skilled in the art can also use other alternative methods to implement the invention. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.

[0023] like Figures 1-5 As shown, an embodiment of this utility model provides a residual stress relief device for a gas furnace cylinder, including a cylinder 1 and an end cap 2 welded and fixed to the end of the cylinder 1, and further including: Tracked heater 3, the tracked heater 3 is wrapped around the weld seam connecting cylinder 1 and end cover 2, and the tracked heater 3 is wrapped with thermal insulation cotton 4. The positioning mechanism 5 includes multiple steel strips 6 wrapped around the insulation cotton 4. The two ends of the same steel strip 6 are connected by bolts. Multiple connecting strips 7 connect adjacent steel strips 6. A detection component is set on the side of the connecting strip 7 away from the insulation cotton 4. The weld seam connecting the cylinder 1 and the end cover 2 is a residual stress concentration area. The tracked heater 3 directly wraps the weld seam to provide a uniform heat source for eliminating residual stress after welding. The insulation cotton 4 reduces heat loss and ensures stable temperature around the weld seam. The ends of the steel strips 6 are locked with bolts to tightly fix the tracked heater 3 and the insulation cotton 4 at the weld seam. The connecting strips 7 increase the contact area between the steel strip 6 and the insulation cotton 4, making the contact between the tracked heater 3 and the cylinder 1 and the end cover 2 more uniform, thereby ensuring the effect of eliminating residual stress after welding.

[0024] like Figures 2-4 As shown in this embodiment, the detection component includes a cylinder 12 fixed to the side of the connecting belt 7 away from the insulation cotton 4. A ring 15 is slidably connected to the inner wall of the cylinder 12. A measuring rod 13 is fixed to the inner wall of the ring 15. One end of the measuring rod 13 moves through the connecting belt 7 and abuts against the outside of the insulation cotton 4. The other end of the measuring rod 13 moves through the cylinder 12. A tension spring 16 is fixed between the ring 15 and the connecting belt 7. The tension spring 16 is sleeved on the measuring rod 13. The measuring rod 13 is engraved with scale lines. The cylinder 12 provides guidance for the measuring rod 13 and the ring 15 to ensure that the measuring rod 13 can extend and retract smoothly. The tension spring 16 makes the measuring rod 13 press against the insulation cotton 4 through the ring 15 to ensure accurate pressure detection. By observing the value of the measuring rod 13 corresponding to the end of the cylinder 12, it can be determined whether the pressure at each position is consistent. If the value is abnormal, the tightness of the bolts on the steel belt 6 can be adjusted to correct it, ensuring that the tracked heater 3 has uniform contact with the cylinder 1 and the end cover 2, and improving the stress relief effect.

[0025] like Figure 2 As shown in this embodiment, a plane 14 is provided on the circumferential surface of the measuring rod 13, and the scale lines are provided on the plane 14. The plane 14 provides a carrier for the scale lines, so as to avoid the scale lines from being worn and blurred due to friction of the circumferential surface when the measuring rod 13 extends or retracts.

[0026] like Figure 1 and Figure 4 As shown in this embodiment, an arc-shaped belt 8 is fixed between two adjacent connecting belts 7. The arc-shaped belt 8 presses on the outside of the insulation cotton 4. The arc-shaped belt 8 fills the gap between adjacent connecting belts 7, further expanding the contact area between the positioning mechanism 5 and the insulation cotton 4, so that the pressure on the track heater 3 is more uniform, and avoids uneven heating caused by poor local contact.

[0027] like Figure 1 and Figure 4As shown in this embodiment, a protrusion 9 is integrally formed in the middle of the arc-shaped belt 8. The protrusion 9 presses against the outside of the insulation cotton 4. A through groove is provided on the protrusion 9. The protrusion 9 increases the contact area between the arc-shaped belt 8 and the insulation cotton 4, making the track heater 3 fit more tightly with the weld perimeter.

[0028] like Figure 1 and Figure 4 As shown in this embodiment, a connecting block 11 is fixed to the side of the protrusion 9. The connecting block 11 is fixed to the side of the steel strip 6. The connecting block 11 firmly connects the arc-shaped strip 8 to the steel strip 6, making the connection between the protrusion 9 of the arc-shaped strip 8 and the steel strip 6 tighter and more secure.

[0029] like Figure 1 and Figure 4 As shown in this embodiment, both ends of the arc-shaped belt 8 are integrally formed with extensions 10. The extensions 10 are fixed to the side of the connecting belt 7. The extensions 10 increase the connection area between the arc-shaped belt 8 and the connecting belt 7, thereby improving the connection strength between the two.

[0030] Working principle: The tracked heater 3 is wrapped around the weld between the cylinder 1 and the end cover 2, and the outside is wrapped with insulation cotton 4 to achieve heat preservation. Multiple steel belts 6 of the positioning mechanism 5 are wrapped around the insulation cotton 4. The two ends of the steel belts 6 are connected by bolts to achieve locking and fixation. The connecting belts 7 between adjacent steel belts 6 increase the contact area between the steel belts 6 and the insulation cotton 4, so that the tracked heater 3 has more uniform contact with the cylinder 1 and the end cover 2. The arc-shaped strip 8 between adjacent connecting strips 7 presses on the insulation cotton 4. The protrusion 9 of the arc-shaped strip 8 and the side connecting block 11 further expand the contact area. The extensions 10 at both ends of the arc-shaped strip 8 are connected and fixed to the connecting strip 7 to improve the connection strength between the arc-shaped strip 8 and the connecting strip 7. Through the cooperation of the above multiple structures, the uniformity of heating of the weld seam by the track heater 3 is ensured. One end of the measuring rod 13 inside the cylinder 12 rests against the insulation cotton 4. The tension spring 16 keeps the measuring rod 13 in a tight state through the ring 15. By observing the scale line on the plane 14 of the measuring rod 13 corresponding to the value at the end of the cylinder 12, it can be determined whether the pressure at each position is consistent. If the value is abnormal, it can be corrected by adjusting the tightness of the bolt on the steel belt 6. Then, the tracked heater 3 is activated to heat the weld. The uniform contact between the tracked heater 3 and the weld periphery, along with the insulation design of the insulation cotton 4, ensures that the weld periphery is heated evenly, effectively eliminating residual stress after welding.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A residual stress relief device for a gas furnace cylinder, comprising a cylinder (1) and an end cap (2) welded and fixed to the end of the cylinder (1), characterized in that, Also includes: Tracked heater (3), the tracked heater (3) is wrapped around the weld seam connecting the cylinder (1) and the end cover (2), and the tracked heater (3) is wrapped with thermal insulation cotton (4). The positioning mechanism (5) includes multiple steel strips (6) wrapped on the insulation cotton (4). The two ends of the same steel strip (6) are connected by bolts. Multiple connecting strips (7) are connected between two adjacent steel strips (6). A detection component is provided on the side of the connecting strip (7) away from the insulation cotton (4).

2. The residual stress relief device for a gas furnace cylinder according to claim 1, characterized in that, The detection assembly includes a cylinder (12) fixed on the side of the connecting belt (7) away from the insulation cotton (4). A ring (15) is slidably connected to the inner wall of the cylinder (12). A measuring rod (13) is fixed to the inner wall of the ring (15). One end of the measuring rod (13) moves through the connecting belt (7) and abuts against the outside of the insulation cotton (4). The other end of the measuring rod (13) moves through the cylinder (12). A tension spring (16) is fixed between the ring (15) and the connecting belt (7). The tension spring (16) is sleeved on the measuring rod (13). The measuring rod (13) is engraved with scale lines.

3. The residual stress relief device for a gas furnace cylinder according to claim 2, characterized in that, The measuring rod (13) has a plane (14) on its circumference, and the scale lines are on the plane (14).

4. The residual stress relief device for a gas furnace cylinder according to claim 1, characterized in that, An arc-shaped band (8) is fixed between two adjacent connecting bands (7), and the arc-shaped band (8) presses against the outside of the insulation cotton (4).

5. The residual stress relief device for a gas furnace cylinder according to claim 4, characterized in that, The arc-shaped band (8) has a protrusion (9) integrally formed in the middle position, and the protrusion (9) is pressed on the outside of the insulation cotton (4).

6. The residual stress relief device for a gas furnace cylinder according to claim 5, characterized in that, A connecting block (11) is fixed to the side of the protrusion (9), and the connecting block (11) is fixed to the side of the steel strip (6).

7. The residual stress relief device for a gas furnace cylinder according to claim 6, characterized in that, A through groove is provided on the protrusion (9).

8. The residual stress relief device for a gas furnace cylinder according to claim 4, characterized in that, Both ends of the arc-shaped band (8) are integrally formed with extensions (10), and the extensions (10) are fixed to the side of the connecting band (7).

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