Weld seam local heat treatment device for hydrogen fluoride acid storage tank

Abstract

The application discloses a local heat treatment device for a welding seam of a hydrofluoric acid storage tank, and relates to the field of welding technology.The local heat treatment device comprises a heating mechanism, the heating mechanism is installed at the bottom of a mounting frame, the mounting frame is slidingly arranged in a moving frame, a sliding block is connected to the upper surface of the moving frame, supports and a fixed plate are arranged on the upper surface of the moving frame, the fixed plate is connected to the supports on the two sides, a servo motor is installed below the fixed plate, a ventilation cavity is formed in the supports, and suction boxes are connected to the lower surfaces of the two ends of the supports.The local heat treatment device has the following advantages: a negative pressure suction structure composed of a vacuum pump, the ventilation cavity and an inner cavity is used in cooperation with a rubber sealing gasket to fix the device on the tank body, a screw rod is driven by the servo motor, and the heating mechanism is uniformly moved along the welding seam and heated by means of a sliding groove and the sliding block, so that the uniformity requirement of local heat treatment of the welding seam is met, the heating device does not need to be manually held by a worker for heating, the operation difficulty is reduced, and the work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a device for local heat treatment of weld seams in hydrofluoric acid storage tanks. Background Technology

[0002] The welding process of hydrofluoric acid storage tanks generates huge concentrated stresses, which significantly reduce the tank's fatigue resistance and resistance to stress corrosion cracking. Hydrofluoric acid environments, especially those containing moisture and impurities, are highly susceptible to stress corrosion cracking. Heat treatment is the most effective means of preventing this failure.

[0003] Existing technology requires heat treatment of the weld using a heating device;

[0004] However, the process requires personnel to manually heat the weld with a heating device, which makes it difficult to maintain uniform heating, resulting in high operational difficulty and low work efficiency. Therefore, we propose a local heat treatment device for the weld of hydrofluoric acid storage tanks. Summary of the Invention

[0005] The purpose of this invention is to provide a device for local heat treatment of weld seams in hydrofluoric acid storage tanks.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a local heat treatment device for weld seams of hydrofluoric acid storage tank, including a heating mechanism, wherein the heating mechanism is installed at the bottom of a mounting frame, the mounting frame is slidably disposed within a movable frame, and a slider is connected to the upper surface of the movable frame;

[0007] The upper surface of the movable frame is provided with a bracket and a fixing plate. The two sides of the fixing plate are connected to the bracket. A servo motor is installed under the fixing plate. A ventilation cavity is opened in the bracket. Adsorption boxes are connected to the lower surfaces of both ends of the bracket. An inner cavity is opened on the lower surface of the adsorption box and communicates with the ventilation cavity. A sliding groove is opened on the lower surface of the fixing plate. A screw is provided on the lower surface of the fixing plate. A slider is slidably arranged in the sliding groove. The slider is threadedly connected to the screw. The screw is connected to the drive shaft of the servo motor. A vacuum pump is installed on the upper surface of the fixing plate. The suction end of the vacuum pump is connected to the suction pipe. The other end of the suction pipe is connected to the bracket and communicates with the ventilation cavity.

[0008] As a further embodiment of the present invention: the movable frame has symmetrical movable grooves on its side, and a movable plate is slidably disposed in the movable groove. The movable plate has an I-shaped plate structure, and the side of the movable plate is fixedly connected to the mounting frame. The side of the mounting frame is rotatably connected to rollers.

[0009] As a further aspect of the present invention: a spring is fixedly connected to the lower surface of the movable frame, and the other end of the spring is fixedly connected to the upper surface of the mounting frame.

[0010] As a further aspect of the present invention: the slider has an I-shaped plate structure, and the lower end of the slider extends outside the groove.

[0011] As a further aspect of the present invention, the groove has a convex groove structure.

[0012] As a further aspect of the present invention: a sealing gasket is fixedly connected to the lower surface of the adsorption box, the sealing gasket is made of rubber material, and a cavity is provided inside the sealing gasket.

[0013] As a further aspect of the present invention: the number of elastic springs is two sets, which are symmetrically distributed on the left and right sides of the lower surface of the movable frame; the upper end of each set of elastic springs is welded and fixed to the lower surface of the movable frame, and the lower end is welded and fixed to the upper surface of the mounting frame; the elastic coefficient of the elastic spring is 2-5 N / mm, the maximum extension is 10-15 mm, and the axis of the elastic spring is perpendicular to the sliding direction of the mounting frame along the movable groove.

[0014] As a further aspect of the present invention: the length of the movable plate is the same as the length of the movable groove, and the fitting clearance between the movable plate and the inner wall of the movable groove is 0.05-0.1mm; there are two sets of rollers, which are rotatably connected to the front and rear sides of the mounting frame respectively, the rollers are made of heat-resistant rubber, the outer diameter of the rollers is 15-20mm, and the compression generated when the outer surface of the roller contacts the surface of the hydrofluoric acid storage tank is 1-2mm.

[0015] As a further aspect of the present invention: in the convex structure of the slide groove, the width of the upper groove is 20-25mm and the depth is 10-12mm, and the width of the lower groove is 10-12mm and the depth is 8-10mm; the width of the upper end of the slider is adapted to the width of the upper groove of the slide groove, and the width of the lower end of the slider is adapted to the width of the lower groove of the slide groove; the fitting clearance between the slider and the inner wall of the slide groove is 0.03-0.05mm, the length of the slider is 30-35mm, and the length of the lower end of the slider extending outside the slide groove is 15-18mm.

[0016] As a further aspect of the present invention: the suction pipe is made of polytetrafluoroethylene, with an inner diameter of 8-10 mm and a wall thickness of 2-3 mm; the connection between the suction pipe and the support is sealed with corrosion-resistant sealant, and the connection between the suction pipe and the suction end of the vacuum pump is a threaded connection; the cross-section of the ventilation cavity is rectangular, with a height of 15-20 mm and a width of 10-15 mm, and both ends of the ventilation cavity are connected to the inner cavities of the two adsorption boxes respectively.

[0017] Compared with the prior art, the beneficial effects of the present invention by adopting the above technical solution are as follows:

[0018] 1. This invention involves attaching the adsorption box of the device to the surface of the tank near the weld of a hydrofluoric acid storage tank. A vacuum pump is activated to extract air from the ventilation chamber and the inner cavity of the adsorption box through the extraction pipe, creating a negative pressure. This negative pressure, combined with the compression deformation of the rubber sealing gasket, causes the adsorption box to be fixed to the surface of the tank under atmospheric pressure. The elastic spring on the lower surface of the moving frame can elastically expand and contract according to the curvature or slight protrusions of the tank surface. The heating mechanism is activated to heat the weld. A servo motor is activated to drive the screw to rotate, causing the slider to slide in the groove. The slider drives the moving frame and the mounting frame to move synchronously, ultimately causing the heating mechanism to move evenly along the weld and heat it. The negative pressure adsorption structure composed of the vacuum pump, ventilation chamber, and inner cavity, combined with the rubber sealing gasket, fixes the device to the tank.

[0019] 2. This invention uses a servo motor to drive a screw, combined with a slide and a slider, to enable the heating mechanism to move at a constant speed along the weld and heat it, thus meeting the uniformity requirements of local heat treatment of the weld. It eliminates the need for personnel to hold the heating device, reducing operational difficulty and improving work efficiency.

[0020] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the device in an embodiment of the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of a portion of the device in an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0024] Figure 4 for Figure 2 Enlarged structural diagram at point B.

[0025] In the diagram: 1. Support; 2. Ventilation chamber; 3. Fixing plate; 4. Adsorption box; 5. Inner cavity; 6. Sealing gasket; 7. Servo motor; 8. Screw; 9. Vacuum pump; 10. Evacuation pipe; 11. Slide groove; 12. Slider; 13. Moving frame; 14. Spring; 15. Moving slot; 16. Moving plate; 17. Mounting frame; 18. Roller; 19. Heating mechanism. Detailed Implementation

[0026] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0027] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Please see the appendix Figure 1 - Appendix Figure 4 The local heat treatment device for weld seams of hydrofluoric acid storage tank of the present invention includes a heating mechanism 19, which is installed at the bottom of the mounting frame 17. The mounting frame 17 is slidably disposed in the movable frame 13. A slider 12 is connected to the upper surface of the movable frame 13. A support 1 and a fixing plate 3 are provided on the upper surface of the movable frame 13. The two sides of the fixing plate 3 are connected to the support 1. A servo motor 7 is installed under the fixing plate 3. A ventilation chamber 2 is opened in the support 1. An adsorption box 4 is connected to the lower surface of both ends of the support 1. An inner cavity 5 is opened on the lower surface of the adsorption box 4. The inner cavity 5 communicates with the ventilation chamber 2. A sliding groove 11 is opened on the lower surface of the fixing plate 3. A screw 8 is provided on the lower surface of the fixing plate 3. A slider 12 is slidably disposed in the sliding groove 11. The slider 12 is threadedly connected to the screw 8. The screw 8 is connected to the drive shaft of the servo motor 7. A vacuum pump 9 is installed on the upper surface of the fixing plate 3. The suction end of the vacuum pump 9 is connected to the suction pipe 10. The other end of the suction pipe 10 is connected to the support 1. The suction pipe 10 communicates with the ventilation chamber 2.

[0029] In practical use, the adsorption box 4 of the device is attached to the surface of the tank near the weld of the hydrofluoric acid storage tank, so that the fixing plate 3 is close to the weld. The vacuum pump 9 on the fixing plate 3 is started. The vacuum pump 9 draws air from the ventilation chamber 2 inside the bracket 1 and the inner cavity 5 of the adsorption box 4 through the air extraction pipe 10, so that the inner cavity 5 is negatively pressured. With the rubber sealing gasket 6 being squeezed and deformed, the adsorption box 4 is firmly fixed to the surface of the tank under atmospheric pressure. The elastic spring 14 on the lower surface of the moving frame 13 can elastically expand and contract according to the curvature or slight protrusions of the tank surface. The rollers 18 on the side of the mounting bracket 17 assist in the fitting and positioning. The heating mechanism 19 is started. The temperature control device in the heating mechanism 19 controls the resistance wire in the heating mechanism 19 to start heating. The heating mechanism 19 maintains a gap with the weld surface to heat the weld. The servo motor 7 is started to drive the screw 8 to rotate. The slider 12, which is threaded to the screw 8, slides in the slide groove 11. The slider 12 drives the moving frame 13 and the mounting bracket 17 to move synchronously. Finally, the heating mechanism 19 moves evenly along the weld to complete the local heat treatment.

[0030] Furthermore, the movable frame 13 has symmetrical movable grooves 15 on its side, and a movable plate 16 is slidably arranged in the movable groove 15. The movable plate 16 has an I-shaped plate structure, and the side of the movable plate 16 is fixedly connected to the mounting frame 17. The side of the mounting frame 17 is rotatably connected to a roller 18.

[0031] Specifically, the rollers 18 on the side of the mounting bracket 17 contact the surface of the tank, which helps the mounting bracket 17 to fit the tank and be positioned.

[0032] Furthermore, a spring 14 is fixedly connected to the lower surface of the movable frame 13, and the other end of the spring 14 is fixedly connected to the upper surface of the mounting frame 17.

[0033] Specifically, the elastic spring 14 between the movable frame 13 and the mounting frame 17 provides elastic support. The I-shaped movable plate 16 on the side of the movable frame 13 slides in the movable groove 15. When there are slight protrusions or arc changes on the surface of the tank, the spring can automatically extend and retract to compensate for the gap, thereby moving the mounting frame 17.

[0034] Furthermore, the slider 12 has an I-shaped plate structure, and the lower end of the slider 12 extends outside the groove 11;

[0035] Specifically, the exposed lower surface of the slider 12 is fixedly connected to the movable frame 13.

[0036] Furthermore, the groove 11 has a convex groove structure;

[0037] Specifically, the upper end of the slider 12 is locked in the slide groove 11, and the slider 12 slides along the slide groove 11.

[0038] Furthermore, a sealing gasket 6 is fixedly connected to the lower surface of the adsorption box 4. The sealing gasket 6 is made of rubber and has a cavity inside.

[0039] Specifically, the rubber sealing gasket 6 has good elasticity and can fit the tiny textures on the surface of the tank. Its built-in cavity can enhance the deformation ability of the sealing gasket 6, further fill the gap between the adsorption box 4 and the surface of the tank, effectively prevent negative pressure leakage after the vacuum pump 9 pumps air, and ensure that the adsorption box 4 is always firmly fixed on the tank during the heat treatment process.

[0040] In this invention, there are two sets of elastic springs 14, which are symmetrically distributed on the left and right sides of the lower surface of the movable frame 13. The upper end of each set of elastic springs 14 is welded and fixed to the lower surface of the movable frame 13, and the lower end is welded and fixed to the upper surface of the mounting frame 17. The elastic coefficient of the elastic spring 14 is 2-5 N / mm, the maximum extension is 10-15 mm, and the axis of the elastic spring 14 is perpendicular to the sliding direction of the mounting frame 17 along the movable groove 15.

[0041] In this invention, the length of the movable plate 16 is the same as the length of the movable groove 15, and the fitting clearance between the movable plate 16 and the inner wall of the movable groove 15 is 0.05-0.1mm; there are two sets of rollers 18, which are rotatably connected to the front and rear sides of the mounting frame 17 respectively. The rollers 18 are made of heat-resistant rubber, the outer diameter of the rollers 18 is 15-20mm, and the compression generated when the outer surface of the rollers 18 contacts the surface of the hydrofluoric acid storage tank is 1-2mm.

[0042] In this invention, in the convex structure of the slide groove 11, the width of the upper groove is 20-25mm and the depth is 10-12mm, and the width of the lower groove is 10-12mm and the depth is 8-10mm; the width of the upper end of the slider 12 is adapted to the width of the upper groove of the slide groove 11, and the width of the lower end of the slider 12 is adapted to the width of the lower groove of the slide groove 11; the fitting clearance between the slider 12 and the inner wall of the slide groove 11 is 0.03-0.05mm, the length of the slider 12 is 30-35mm, and the length of the lower end of the slider 12 extending outside the slide groove 11 is 15-18mm.

[0043] In this invention, the suction pipe 10 is made of polytetrafluoroethylene, with an inner diameter of 8-10 mm and a wall thickness of 2-3 mm. The connection between the suction pipe 10 and the support 1 is sealed with corrosion-resistant sealant, and the connection between the suction pipe 10 and the suction end of the vacuum pump 9 is a threaded connection. The cross-section of the ventilation chamber 2 is rectangular, with a height of 15-20 mm and a width of 10-15 mm. Both ends of the ventilation chamber 2 are connected to the inner cavities 5 of the two adsorption boxes 4, respectively.

[0044] Working principle:

[0045] First, the adsorption box 4 of the device is attached to the surface of the tank near the weld of the hydrofluoric acid storage tank. The vacuum pump 9 is started, drawing air from the ventilation chamber 2 inside the support 1 and the inner cavity 5 of the adsorption box 4 through the extraction pipe 10, creating negative pressure. This, combined with the compression deformation of the rubber sealing gasket 6, fixes the adsorption box 4 to the tank surface under atmospheric pressure. The elastic spring 14 on the lower surface of the moving frame 13 can elastically expand and contract according to the curvature or slight protrusions of the tank surface. The heating mechanism 19 is started to heat the weld. The servo motor 7 is started to drive the screw 8 to rotate, causing the slider 12 to slide within the groove 11. Block 12 drives the moving frame 13 and mounting frame 17 to move synchronously, ultimately causing the heating mechanism 19 to move evenly along the weld and heat it. Through the negative pressure adsorption structure composed of vacuum pump 9, ventilation chamber 2, and inner cavity 5, and with the rubber sealing gasket 6, the device is fixed on the tank. Servo motor 7 drives screw 8, which, together with slide groove 11 and slider 12, enables the heating mechanism 19 to move at a uniform speed along the weld and heat it, meeting the uniformity requirements of local heat treatment of the weld. There is no need for personnel to hold the heating device to heat it, reducing the difficulty of operation and improving work efficiency. At this point, the entire workflow is completed.

[0046] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on.

[0047] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0049] For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A device for local heat treatment of weld seams in a hydrofluoric acid storage tank, comprising a heating mechanism (19), characterized in that: The heating mechanism (19) is installed at the bottom of the mounting frame (17), the mounting frame (17) is slidably disposed in the movable frame (13), and the upper surface of the movable frame (13) is connected to a slider (12). The upper surface of the movable frame (13) is provided with a bracket (1) and a fixing plate (3). The two sides of the fixing plate (3) are connected to the bracket (1). A servo motor (7) is installed under the fixing plate (3). A ventilation chamber (2) is opened inside the bracket (1). An adsorption box (4) is connected to the lower surface of both ends of the bracket (1). An inner cavity (5) is opened on the lower surface of the adsorption box (4). The inner cavity (5) is connected to the ventilation chamber (2). A sliding groove (11) is opened on the lower surface of the fixing plate (3). A screw (8) is provided on the lower surface of the fixed plate (3), and a slider (12) is slidably provided in the groove (11). The slider (12) is threadedly connected to the screw (8), and the screw (8) is connected to the drive shaft of the servo motor (7). A vacuum pump (9) is installed on the upper surface of the fixed plate (3). The vacuum pump (9) is connected to the suction pipe (10) at the suction end, and the other end of the suction pipe (10) is connected to the bracket (1). The suction pipe (10) is connected to the ventilation chamber (2). The movable frame (13) has symmetrical movable slots (15) on its side. A movable plate (16) is slidably arranged in the movable slot (15). The movable plate (16) has an I-shaped plate structure. The side of the movable plate (16) is fixedly connected to the mounting frame (17). The side of the mounting frame (17) is rotatably connected to a roller (18). A spring (14) is fixedly connected to the lower surface of the movable frame (13), and the other end of the spring (14) is fixedly connected to the upper surface of the mounting frame (17). The number of elastic springs (14) is two sets, which are symmetrically distributed on the left and right sides of the lower surface of the movable frame (13); the upper end of each set of elastic springs (14) is welded and fixed to the lower surface of the movable frame (13), and the lower end is welded and fixed to the upper surface of the mounting frame (17); the elastic coefficient of the elastic spring (14) is 2-5 N / mm, the maximum extension is 10-15 mm, and the axis of the elastic spring (14) is perpendicular to the sliding direction of the mounting frame (17) along the moving groove (15).

2. The local heat treatment device for weld seams of a hydrofluoric acid storage tank according to claim 1, characterized in that: The slider (12) has an I-shaped plate structure, and the lower end of the slider (12) extends outside the groove (11).

3. The local heat treatment device for weld seams of a hydrofluoric acid storage tank according to claim 1, characterized in that: The groove (11) has a convex groove structure.

4. The local heat treatment device for weld seams of a hydrofluoric acid storage tank according to claim 1, characterized in that: A sealing gasket (6) is fixedly connected to the lower surface of the adsorption box (4). The sealing gasket (6) is made of rubber and has a cavity inside.

5. The local heat treatment device for weld seams of a hydrofluoric acid storage tank according to claim 1, characterized in that, The length of the movable plate (16) is the same as the length of the movable groove (15), and the fit clearance between the movable plate (16) and the inner wall of the movable groove (15) is 0.05-0.1mm; there are two sets of rollers (18), which are rotatably connected to the front and rear sides of the mounting frame (17). The rollers (18) are made of heat-resistant rubber, and the outer diameter of the rollers (18) is 15-20mm. The compression generated when the outer surface of the rollers (18) contacts the surface of the hydrofluoric acid storage tank is 1-2mm.

6. The local heat treatment device for weld seams of a hydrofluoric acid storage tank according to claim 3, characterized in that, In the convex structure of the slide groove (11), the upper groove has a width of 20-25mm and a depth of 10-12mm, and the lower groove has a width of 10-12mm and a depth of 8-10mm; the upper width of the slider (12) is adapted to the width of the upper groove of the slide groove (11), and the lower width of the slider (12) is adapted to the width of the lower groove of the slide groove (11); the fitting clearance between the slider (12) and the inner wall of the slide groove (11) is 0.03-0.05mm, the length of the slider (12) is 30-35mm, and the length of the lower end of the slider (12) extending outside the slide groove (11) is 15-18mm.

7. The local heat treatment device for weld seams of a hydrofluoric acid storage tank according to claim 1, characterized in that, The material of the suction pipe (10) is polytetrafluoroethylene, the inner diameter of the suction pipe (10) is 8-10mm and the wall thickness is 2-3mm; the connection between the suction pipe (10) and the bracket (1) is sealed with corrosion-resistant sealant, and the connection between the suction pipe (10) and the suction end of the vacuum pump (9) is a threaded connection; the cross section of the ventilation chamber (2) is rectangular, the height of the ventilation chamber (2) is 15-20mm and the width is 10-15mm, and the two ends of the ventilation chamber (2) are respectively connected to the inner cavity (5) of the two adsorption boxes (4).

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