Automatic submerged arc welding device and method for fused salt storage tank

Abstract

The invention belongs to the technical field of automatic welding devices, and provides an automatic submerged arc welding device and method for a fused salt storage tank, a first walking mechanism and a second walking mechanism are arranged between a circular track and a welding machine, and the problems of local welding skips and the like caused by desynchrony of the welding machine and the track are avoided; the welding gun is arranged on the welding machine through an adjusting mechanism, the adjusting mechanism comprises a controller, a second connecting plate, a supporting wheel arranged on the second connecting plate through a second telescopic rod, a first detection sensor and a second detection sensor, and the first detection sensor and the second detection sensor are arranged on the welding machine and used for detecting the surface radian of the fused salt storage tank. The controller adjusts the second telescopic rod according to the detected radian change condition of the surface of the fused salt storage tank, so that real-time adjustment of the distance between the welding gun on the second connecting plate and the surface of the fused salt storage tank is achieved, the distance between the welding gun and the welding face can be adjusted and changed in real time at the positions, locally uneven, of the surface of the fused salt storage tank and the radian change surface, and the welding quality of the fused salt storage tank is improved. And the welding uniformity is ensured, and the welding quality is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic welding devices, and particularly relates to a submerged arc automatic welding device and method for molten salt storage tanks. Background Art

[0002] As the most important equipment in the molten salt heat storage and heat exchange system of a solar thermal power plant, due to the particularity of the material and thickness of the molten salt storage tank, its welding is difficult, and welding defects are extremely likely to occur during the production welding process. The submerged arc SAW automatic welding technology can ensure the appearance forming and internal quality of the weld seam.

[0003] The inventor found that when currently performing submerged arc automatic welding on a molten salt storage tank, a temporary scaffolding is used for support, the slideway is single, and the welding machine and the track are not synchronized, which is extremely likely to cause local lack of welding; moreover, during the processing or transportation process, due to processing errors or collisions during transportation, etc., the curvature of the surface of the molten salt storage tank changes, resulting in uneven surfaces locally on the surface of the molten salt storage tank, or problems with curvature changes in a relatively large area; during the process of performing submerged arc automatic welding along a circular track by the welding equipment, with the circular track determined, the welding path of the welding torch is a standard circular trajectory. At the locally uneven surface of the molten salt storage tank and at the surface with curvature changes, the distance between the welding torch and the welding surface will change, resulting in uneven welding compared with other positions, affecting the overall welding uniformity of the molten salt storage tank, and even affecting the welding quality and stability due to the change in the welding distance. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a submerged arc automatic welding device and method for a molten salt storage tank. A first traveling mechanism and a second traveling mechanism are arranged between the circular track and the welding machine, avoiding problems such as local lack of welding caused by the non-synchronization of the welding machine and the track; a support wheel is arranged through a second telescopic rod, and a first detection sensor and a second detection sensor for detecting the surface curvature of the molten salt storage tank are arranged; the controller adjusts the second telescopic rod according to the detected change in the surface curvature of the molten salt storage tank, thereby realizing real-time adjustment of the distance between the welding torch on the second connecting plate and the surface of the molten salt storage tank. At the locally uneven surface of the molten salt storage tank and at the surface with curvature changes, the distance between the welding torch and the welding surface can be adjusted and changed in real time, ensuring welding uniformity and welding quality.

[0005] To achieve the above object, in the first aspect, the present invention provides a submerged arc automatic welding device for a molten salt storage tank, adopting the following technical solution:

[0006] A submerged arc automatic welding device for a molten salt storage tank includes a track, and a welding machine arranged on the track through a traveling mechanism;

[0007] The orbit is a circular orbit, and the traveling mechanism includes a first traveling mechanism and a second traveling mechanism respectively arranged at both ends of the welding machine;

[0008] A welding torch is arranged on the side of the welding machine through an adjusting mechanism; the adjusting mechanism includes a controller arranged on the welding machine, a second connecting plate arranged on the welding machine, a supporting wheel arranged on the second connecting plate through a second telescopic rod, and a first detection sensor and a second detection sensor arranged on the welding machine for detecting the surface curvature of the molten salt storage tank;

[0009] The welding torch is arranged on the second connecting plate; the first detection sensor, the second detection sensor and the second telescopic rod are connected to the controller, and the controller adjusts the second telescopic rod according to the detected change in the surface curvature of the molten salt storage tank.

[0010] Furthermore, the welding machine includes a flux hopper; a dust collector is arranged on the welding machine, and the dust collector is connected to the flux hopper through a dust suction pipe.

[0011] Furthermore, the adjusting mechanism further includes a first connecting plate arranged on the welding machine, connecting rods and a first telescopic rod arranged at both ends of the first connecting plate; both ends of the connecting rod are respectively hinged to the first connecting plate and the second connecting plate, and the first telescopic rod is hinged to the second connecting plate.

[0012] Furthermore, the first telescopic rod is connected to the controller, and the controller controls the telescopic degree of the first telescopic rod according to the inclination of the welding machine relative to the horizontal plane.

[0013] Furthermore, a support frame is arranged between the traveling mechanism and the welding machine; a buffer mechanism is arranged between the support frame and the welding machine.

[0014] Furthermore, the buffer mechanism includes a first buffer plate connected to the welding machine and a second buffer plate connected to the support frame; a plurality of elastic connecting pieces are arranged between the first buffer plate and the second buffer plate.

[0015] Furthermore, third telescopic rods and fourth telescopic rods are respectively arranged at both ends of the first buffer plate; a first top plate is hinged on the third telescopic rod, and a second top plate is hinged on the fourth telescopic rod; the first top plate is fixedly connected to the first buffer plate, and the second top plate is in contact with the first buffer plate.

[0016] Furthermore, the third telescopic rod and the fourth telescopic rod are connected to the controller, and the controller adjusts the third telescopic rod and the fourth telescopic rod according to the detected change in the surface curvature of the molten salt storage tank.

[0017] Further, the first traveling mechanism is a driving traveling mechanism, and the second traveling mechanism is a driven traveling mechanism.

[0018] To achieve the above object, in a second aspect, the present invention also provides a submerged arc automatic welding method for a molten salt storage tank, adopting the following technical solutions:

[0019] A submerged arc automatic welding method for a molten salt storage tank uses the submerged arc automatic welding device as described in the first aspect, including: the controller adjusts the second telescopic rod according to the detected change in the surface curvature of the molten salt storage tank.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In the present invention, a first traveling mechanism and a second traveling mechanism are arranged between the circular track and the welding machine, avoiding problems such as local missed welding caused by the asynchrony between the welding machine and the track; the welding torch is arranged on the welding machine through an adjusting mechanism, and the adjusting mechanism includes a controller arranged on the welding machine, a second connecting plate arranged on the welding machine, a supporting wheel arranged on the second connecting plate through a second telescopic rod, and a first detection sensor and a second detection sensor arranged on the welding machine for detecting the surface curvature of the molten salt storage tank; the controller adjusts the second telescopic rod according to the detected change in the surface curvature of the molten salt storage tank, so as to realize the real-time adjustment of the distance between the welding torch on the second connecting plate and the surface of the molten salt storage tank. At the surface of the molten salt storage tank with local unevenness and at the surface with curvature change, the distance between the welding torch and the welding surface can be adjusted and changed in real time, ensuring the welding uniformity and the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The schematic diagrams of the specification drawings forming a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments and descriptions thereof of this embodiment are used to explain this embodiment and do not constitute an improper limitation to this embodiment.

[0023] Figure 1 It is a schematic structural diagram of the device according to Embodiment 1 of the present invention;

[0024] Figure 2 It is a side view of the device according to Embodiment 1 of the present invention;

[0025] Figure 3 It is a schematic diagram of the adjusting mechanism according to Embodiment 1 of the present invention;

[0026] Figure 4 It is a schematic diagram of the angle adjustment according to Embodiment 1 of the present invention;

[0027] Figure 5 It is a schematic diagram of the buffer mechanism according to Embodiment 1 of the present invention;

[0028] Among them, 100 is a welding machine; 101 is a welding flux hopper; 102 is a welding torch; 200 is an adjusting mechanism; 201 is a controller; 202 is an outer cover; 203 is a first connecting plate; 204 is a connecting rod; 205 is a first telescopic rod; 206 is a second connecting plate; 207 is a second telescopic rod; 208 is a supporting wheel; 209 is a first detection sensor; 210 is a second detection sensor; 300 is a buffering mechanism; 301 is a first buffer plate; 302 is a second buffer plate; 303 is a third telescopic rod; 304 is a first top plate; 305 is a fourth telescopic rod; 306 is a second top plate; 307 is an elastic connecting piece; 400 is a support frame; 500 is a traveling mechanism; 501 is a first traveling mechanism; 502 is a second traveling mechanism; 600 is a track; 700 is a vacuum cleaner; 800 is a suction pipe; 900 is a molten salt storage tank. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further descriptions of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0031] Molten salt storage tank, molten salt heat storage tank: A steel tank used to store high-temperature molten salt.

[0032] Embodiment 1:

[0033] Solar thermal power generation is an important direction for the utilization of new energy. The greatest advantage of solar thermal power generation lies in the stable power output, which can be used as basic power and for peak shaving. In addition, its mature and reliable energy storage (heat storage) configuration can continuously generate electricity at night. It is a clean and renewable energy source that can replace traditional fossil fuels and reduce environmental pollution. This technology has received more and more attention in many regions. The molten salt storage tank of the molten salt heat exchange system in a solar thermal power plant is the most important equipment in the entire solar thermal power generation system. Due to the particularity of the material and thickness of the molten salt storage tank, it is difficult to weld, and welding defects are extremely likely to occur during the production welding process. The submerged arc SAW automatic welding technology can ensure the appearance forming and internal quality of the weld. The welding line energy is small, there is basically no deformation during the welding process, the operation is simple, the welding efficiency is high, and the requirements for the personal skill level of welders are not high. In order to accelerate the construction period of the molten salt storage tank, enhance the advantages of large-scale automatic welding construction, and improve the welding quality, this embodiment studies the submerged arc (SAW) automatic welding operation station technology for high-temperature large-volume molten salt storage tanks in solar thermal power generation.

[0034] As described in the background art, in the submerged arc (SAW) automatic welding operation station of high-temperature large-volume molten salt storage tanks, temporary scaffolding is conventionally used for support, the slideway is single, the automatic welding machine is not synchronized with the track, and local welding omission is extremely likely to occur, resulting in quality defects such as weld cracks and incomplete penetration; moreover, during the processing or transportation process, due to processing errors or collisions during transportation, etc., the curvature of the surface of the molten salt storage tank changes, local uneven surfaces occur on the surface of the molten salt storage tank, or problems of curvature change occur in areas with a relatively large area; during the submerged arc automatic welding process of the welding equipment along the circular track, the circular track is determined, and the welding path of the welding torch is a standard circular trajectory. At the local uneven surface of the molten salt storage tank and the surface with curvature change, the distance between the welding torch and the welding surface will change, resulting in uneven welding at other positions, affecting the overall welding uniformity of the molten salt storage tank, and even affecting the welding quality and stability due to the change in the welding distance.

[0035] To solve at least one of the above problems, as Figure 1 and Figure 2 shown, this embodiment provides a submerged arc automatic welding device for molten salt storage tanks, including a welding machine 100, an adjusting mechanism 200, a buffer mechanism 300, a support frame 400, a traveling mechanism 500, a track 600, a vacuum cleaner 700, a suction pipe 800, and a molten salt storage tank 900.

[0036] As Figure 1 shown, the welding machine 100 includes a flux hopper 101 for putting flux into the welding machine 100 and a welding torch 102 for performing welding actions; optionally, the flux hopper 101 is arranged at the upper end of the welding machine 100, and the welding torch 102 is arranged on the side of the welding machine 100 through the adjusting mechanism 200. The internal setting and working principle of the welding machine 100 can be realized by conventional welding equipment and will not be elaborated here; the "upper end" and "side" are for intuitive expression and are not limited in direction in the actual product Figure 1 relative to the attached drawings of the specification.

[0037] As Figure 3 shown, optionally, the adjusting mechanism 200 includes a controller 201 arranged on the welding machine 100, a second connecting plate 206 arranged on the welding machine 100, a supporting wheel 208 arranged on the second connecting plate 206 through a second telescopic rod 207, and a first detection sensor 209 and a second detection sensor 210 arranged on the welding machine 100 for detecting the surface curvature of the molten salt storage tank 900;

[0038] The welding torch 102 is arranged on the second connecting plate 206; the first detection sensor 209, the second detection sensor 210 and the second telescopic rod 207 are connected to the controller 201, and the controller 201 adjusts the second telescopic rod 207 according to the detected change in the surface curvature of the molten salt storage tank 900.

[0039] Optionally, the controller 201 can adopt a PLC controller or other controllers; the second connecting plate 206 can adopt a structure such as a rectangular metal plate; the second telescopic rod 207 can adopt a hydraulic telescopic rod, a pneumatic telescopic rod or an electric telescopic rod, etc. When welding, the support wheel 208 travels on the surface of the molten salt storage tank 900, improving the traveling stability of the entire welding machine 100.

[0040] The first detection sensor 209 and the second detection sensor 210 can be arranged on the upper and lower sides of the adjusting mechanism 200 through the outer cover 202. The first detection sensor 209 and the second detection sensor 210 can adopt an image sensor, etc. By extracting the arc features from the captured images and comparing them with the preset arc or the previous arc, it is possible to determine whether there are unevenness or arc changes, etc.

[0041] It can be understood that the first detection sensor 209 detects the surface to be welded in front, and the second detection sensor 210 detects the surface that the front traveling wheel is to pass through; even if the surface to be welded in front has an arc change, when the arc change of the surface that the front traveling wheel is to pass through is the same as the arc change of the surface to be welded, there is no need to control the second telescopic rod 207, and the support wheel 208 will travel on the changed surface, and the welding machine 100 will tilt automatically so that the distance between the welding torch 102 and the welding surface is equal. If the arc change of the surface that the front traveling wheel is to pass through is different from the arc change of the surface to be welded, it is necessary to control the second telescopic rod 207 to change the inclination degree of the welding machine 100 so that the welding distance of the welding torch 102 when passing through the arc change surface remains unchanged.

[0042] It can be understood that when it is detected that there is local unevenness on the surface of the molten salt storage tank 900 or the surface curvature of the molten salt storage tank 900 changes, the controller 201 adjusts the second telescopic rod 207 according to the detected change in the surface curvature of the molten salt storage tank 900, so as to realize the real-time adjustment of the distance between the welding torch 102 on the second telescopic rod 207 and the surface of the molten salt storage tank 900. At the local uneven surface of the molten salt storage tank 900 and the arc change surface, the distance between the welding torch 102 and the welding surface can be adjusted and changed in real time, ensuring welding uniformity and welding quality.

[0043] Such as Figure 3 and Figure 4As described above, the adjustment mechanism 200 further includes a first connecting plate 203 disposed on the welding machine 100, connecting rods 204 and a first telescopic rod 205 disposed at both ends of the first connecting plate 203; both ends of the connecting rod 204 are respectively hinged to the first connecting plate 203 and the second connecting plate 206, and the first telescopic rod 205 is hinged to the second connecting plate 206. The first telescopic rod 205 is connected to the controller 201, and the controller 201 controls the telescopic degree of the first telescopic rod 205 according to the inclination magnitude of the welding machine 100 relative to the horizontal plane. For example, when the entire welding machine 100 is inclined by an angle θ due to the retraction of the second telescopic rod 207, in order to ensure the base of the support wheel 208 on the surface of the molten salt storage tank 900, that is, to ensure that the axis of the support wheel 208 is parallel to the surface of the molten salt storage tank 900, at this time, by adjusting the first telescopic rod 205, the second connecting plate 206 is inclined by an angle θ in the direction opposite to the welding machine 100. On the basis of satisfying the adjustment of the distance between the welding torch 102 and the welding surface, the support stability of the support wheel 208 and the welding angle of the welding torch 102 are ensured.

[0044] Optionally, the first connecting plate 203 can be a rectangular metal plate; the first telescopic rod 205 can be a hydraulic telescopic rod, a pneumatic telescopic rod or an electric telescopic rod, etc.; the connecting rod 204 can be set as a telescopic rod.

[0045] As Figure 5 As shown, a support frame 400 is provided between the traveling mechanism 500 and the welding machine 100; a buffer mechanism 300 is provided between the support frame 400 and the welding machine 100. The buffer mechanism 300 includes a first buffer plate 301 connected to the welding machine 100 and a second buffer plate 302 connected to the support frame 400; a plurality of elastic connectors 307 are provided between the first buffer plate 301 and the second buffer plate 302; when the second telescopic rod 207 expands and contracts to cause the entire welding machine 100 to tilt, the influence on the welding machine 100 and its internal components can be reduced under the action of the plurality of elastic connectors 307 in the buffer mechanism 300.

[0046] Both ends of the first buffer plate 301 are respectively provided with a third telescopic rod 303 and a fourth telescopic rod 305; a first top plate 304 is hinged on the third telescopic rod 303, and a second top plate 306 is hinged on the fourth telescopic rod 305; the first top plate 304 is fixedly connected to the first buffer plate 301, and the second top plate 306 is in contact with the first buffer plate 301. When the welding machine 100 needs to be tilted, the fourth telescopic rod 305 shortens, separating the second top plate 306 from the first buffer plate 301, which is beneficial to tilting the welding machine 100 through the second telescopic rod 207; after the second telescopic rod 207 is adjusted, the fourth telescopic rod 305 elongates, bringing the second top plate 306 into contact with the first buffer plate 301, avoiding the shaking of the first buffer plate 301 and the welding machine 100 during the welding process.

[0047] The third telescopic rod 303 and the fourth telescopic rod 305 are connected to the controller 201, and the controller 201 adjusts the third telescopic rod 303 and the fourth telescopic rod 305 according to the detected change in the surface curvature of the molten salt storage tank 900; the adjustment of the third telescopic rod 303 and the fourth telescopic rod 305 can ensure that the welding height of the welding torch 102 remains unchanged, guaranteeing the welding quality.

[0048] Optionally, the support frame 400 can adopt a structure such as a metal frame; the first buffer plate 301, the second buffer plate 302, the first top plate 304, and the second top plate 306, etc. can adopt metal rectangular plates; the third telescopic rod 303 and the fourth telescopic rod 305 can adopt hydraulic telescopic rods, pneumatic telescopic rods, or electric telescopic rods, etc.; the elastic connecting member 307 can adopt a spring; the first top plate 304 and the second top plate 306 can be connected to the third telescopic rod 303 and the fourth telescopic rod 305 through ball joints or other hinge methods.

[0049] Optionally, the track 600 is a circular track that can be arranged circumferentially around the molten salt storage tank 900; as Figure 2 shown, the traveling mechanism 500 includes a first traveling mechanism 501 and a second traveling mechanism 502 respectively arranged at both ends of the welding machine 100; cooperating with the support wheels 208, it avoids problems such as local missed welding caused by the asynchrony between the welding machine 100 and the track 600. To further improve the stability, two adjusting mechanisms 200 can be arranged on the welding machine 100, and the welding torch 102 is arranged on one of the adjusting mechanisms 200.

[0050] The first traveling mechanism 501 is a driving traveling mechanism, and the second traveling mechanism 502 is a driven traveling mechanism. Optionally, the first traveling mechanism 501 may include a motor and wheels provided on the output shaft of the motor, and the wheels travel on the track 600.

[0051] As Figure 1 shown, a dust collector 700 is provided on the welding machine 100, and the dust collector 700 is connected to the flux hopper 101 through a suction pipe 800; dust and other impurities in the flux can be adsorbed through the dust collector 700, ensuring the quality of the flux and improving the welding quality.

[0052] Embodiment 2:

[0053] This embodiment provides a submerged arc automatic welding method for a molten salt storage tank, using the submerged arc automatic welding device described in Embodiment 1, including: the controller 201 adjusts the second telescopic rod 207 according to the detected change in the surface curvature of the molten salt storage tank 900.

[0054] The foregoing is only the preferred embodiment of this embodiment and is not intended to limit this embodiment. For those skilled in the art, this embodiment can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this embodiment shall be included within the protection scope of this embodiment.

Claims

1. A submerged arc automatic welding device for molten salt storage tanks, characterized in that: It comprises a track (600) and a welding machine (100) arranged on the track via a walking mechanism (500); The track (600) is a circular track, and the walking mechanism (500) comprises a first walking mechanism (501) and a second walking mechanism (502) respectively arranged at two ends of the welding machine; A welding gun (102) is arranged on the side of the welding machine (100) via an adjustment mechanism (200); the adjustment mechanism (200) comprises a controller (201) arranged on the welding machine (100), a second connecting plate (206) arranged on the welding machine (100), a supporting wheel (208) arranged on the second connecting plate (206) via a second telescopic rod (207), and a first detection sensor (209) and a second detection sensor (210) arranged on the welding machine (100) for detecting the curvature of the surface of the molten salt storage tank; The welding gun (102) is arranged on the second connecting plate (206); the first detection sensor (209), the second detection sensor (210) and the second telescopic rod (207) are connected to the controller (201), and the controller (201) adjusts the second telescopic rod (207) according to the detected curvature change of the surface of the molten salt storage tank.

2. A submerged arc automatic welding device for molten salt storage tanks according to claim 1, characterized in that: The welding machine (100) comprises a flux funnel (101); a dust collector (700) is provided on the welding machine (100), and the dust collector (700) is connected to the flux funnel (101) via a dust collection pipe (800).

3. A submerged arc automatic welding device for a molten salt storage tank as claimed in claim 1, characterized in that: The adjustment mechanism (200) further comprises a first connecting plate (203) arranged on the welding machine (100), a connecting rod (204) and a first telescopic rod (205) arranged at two ends of the first connecting plate (203); the two ends of the connecting rod (204) are respectively hinged to the first connecting plate (203) and the second connecting plate (206), and the first telescopic rod (205) is hinged to the second connecting plate (206).

4. A submerged arc automatic welding device for molten salt storage tanks as claimed in claim 3, characterized in that: The first telescopic rod (205) is connected to the controller (201), and the controller (201) controls the telescopic degree of the first telescopic rod (205) according to the inclination of the welding machine (100) relative to the horizontal plane.

5. The submerged arc automatic welding device for molten salt storage tank according to claim 1, characterized in that: A support frame (400) is provided between the walking mechanism (500) and the welding machine (100); and a buffer mechanism (300) is provided between the support frame (400) and the welding machine (100).

6. A submerged arc automatic welding device for a molten salt storage tank as claimed in claim 5, characterized in that: The buffer mechanism (300) comprises a first buffer plate (301) connected to the welding machine (100), and a second buffer plate (302) connected to the support frame (400); a plurality of elastic connecting members (307) are arranged between the first buffer plate (301) and the second buffer plate (302).

7. A submerged arc automatic welding device for a molten salt storage tank as claimed in claim 6, characterized in that: A third telescopic rod (303) and a fourth telescopic rod (305) are respectively provided at two ends of the first buffer plate (301); a first top plate (304) is hingedly connected to the third telescopic rod (303), and a second top plate (306) is hingedly connected to the fourth telescopic rod (305); the first top plate (304) is fixedly connected to the first buffer plate (301), and the second top plate (306) is in contact with the first buffer plate (301).

8. A submerged arc automatic welding device for a molten salt storage tank as claimed in claim 7, characterized in that: The third telescopic rod (303) and the fourth telescopic rod (305) are connected to the controller (201), and the controller (201) adjusts the third telescopic rod (303) and the fourth telescopic rod (305) according to the detected curvature change of the surface of the molten salt storage tank.

9. The submerged arc automatic welding device for molten salt storage tank according to claim 1, characterized in that: The first walking mechanism (501) is an active walking mechanism, and the second walking mechanism (502) is a passive walking mechanism.

10. A submerged arc automatic welding method for a molten salt storage tank, characterized in that: The submerged arc automatic welding device for a molten salt storage tank as claimed in any one of claims 1 to 9 is used, comprising: the controller (201) adjusting the second telescopic rod (207) according to the detected curvature change of the surface of the molten salt storage tank.

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