A water tank welding tooling

Abstract

The present invention belongs to the technical field of welding tooling, and in particular relates to a water tank welding tooling, which includes a support base. An opening is provided on the lower surface of the support base, and two connecting rods are fixedly connected to the hole wall of the opening. The bottom ends of the two connecting rods are fixedly connected with a cross plate. The present invention enables the welding tooling to adapt to the welding positioning operation of a relatively thin water tank. It not only has the ability to automatically position the water tank components, but also can prevent the water tank from being deformed and damaged when clamped by the welding tooling. At the same time, the welding tooling has the function of arranging welding protective gas inside the water tank to assist welding, thereby effectively improving the reliability of the use of the welding tooling and the success rate of water tank welding. Moreover, the water tank welding tooling also has the functions of detecting the welding airtightness of the water tank and displaying the welding leakage points of the water tank, eliminating the need for workers to transfer the water tank to the airtightness detection station, saving time and effort, and greatly improving the convenience and efficiency of water tank welding processing.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding fixtures, and in particular relates to a water tank welding fixture. Background Art

[0002] At present, an air energy water heater stores and provides hot water through a circulating water tank. In order to reduce costs, reduce the weight of the equipment, and improve the heat transfer efficiency, the material of this circulating water tank is often made of stainless steel plates with a relatively thin thickness. In addition, in order to facilitate the installation of electronic devices for the operation of the circulating water tank, the water tank cover plate often uses a plastic cover plate. The plastic cover plate can be easily made into the shape required for the installation of electronic devices through a mold. At the same time, the plastic cover plate also has excellent insulation performance, avoiding the safety hazard of the entire water tank being electrified due to the leakage of the electronic devices on the circulating water tank cover plate.

[0003] At present, the welding process of the water tank bottom plate and the water tank body made of stainless steel still requires the assistance of a welding fixture. For example, the authorized announcement number is CN211966453U, which discloses a water tank welding fixture to ensure the quality of water tank welding. However, when the welding fixture is used for welding and positioning of a relatively thin water tank, there is an unreliable clamping situation, which is likely to cause deformation and damage of the relatively thin water tank, affecting the success rate of water tank welding processing. In addition, the existing water tank welding fixture does not have a weld airtightness detection, so the welded water tank needs to be transferred to other detection equipment, increasing the complexity of water tank welding processing and affecting the convenience and efficiency of water tank welding processing.

[0004] Therefore, we propose a water tank welding fixture to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a water tank welding fixture for the above problems.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A water tank welding fixture includes a support base. An opening is provided on the lower surface of the support base, and two connecting rods are fixedly connected to the hole wall of the opening. The bottom ends of the two connecting rods are fixedly connected to a cross plate. A moving block that cooperates with the opening is commonly sleeved on the rod walls of the two connecting rods. Two water tank positioning templates are movably connected to the upper surface of the moving block. A connecting cylinder is fixedly connected to the outer wall of the water tank positioning template, and a rectangular inner hole is provided in the inner wall of the connecting cylinder. A limiting card slot is provided on the outer wall of the connecting cylinder. A first electric push rod is fixedly connected to the top end of the cross plate, and the top end of the first electric push rod is fixedly connected to the lower surface of the moving block. A U-shaped frame is fixedly connected to the upper surface of the support base, and a template closing mechanism is fixedly connected to the outer wall of the U-shaped frame.

[0007] A second electric push rod is fixedly sleeved at the top end of the U-shaped frame. A connecting plate is movably sleeved on one outer wall of the U-shaped frame. The top end of the connecting plate is fixedly connected to the moving end of the second electric push rod. An air guiding mechanism is fixedly connected to the upper surface of the connecting plate;

[0008] A PLC controller and a weld seam airtightness detection mechanism are fixedly connected to the upper surface of the U-shaped frame.

[0009] In the above-mentioned water tank welding tooling, the template closing mechanism includes two cylinders fixedly connected to the outer walls on both sides of the U-shaped frame. Fixed through holes matching the outer walls of the cylinders are provided on the outer walls on both sides of the U-shaped frame. A sealing ring is movably connected to the inner wall of the cylinder. A connecting rod is fixedly connected to the inner wall of the sealing ring. The side end of the connecting rod passes through the connection hole of the cylinder and extends outwards. A rectangular block matching the rectangular inner hole of the connecting cylinder is fixedly connected to the outer side end of the connecting rod. A plurality of elastic sheets are fixedly connected to the outer wall of the rectangular block. An arc-shaped clamping block matching the limit clamping groove is fixedly connected to the side of the elastic sheet close to the connecting cylinder. Air pipes are fixedly communicated with the side ends of the two cylinders. The top ends of the two air pipes are fixedly communicated with an air pump together. The outer wall of the air pump is fixedly connected to the outer wall of the U-shaped frame. The top end of the lifting rod of the air pump is fixedly connected to the lower surface of the connecting plate.

[0010] In the above-mentioned water tank welding tooling, the air guiding mechanism includes a third electric push rod fixedly connected to the upper surface of the connecting plate. A fixed block is fixedly connected to the top end of the third electric push rod. A through hole is provided on the upper surface of the fixed block, and a rigid pipe is fixedly connected to the hole wall of the through hole. The bottom end of the rigid pipe passes through the lower surface of the connecting plate. An installation hole matching the rigid pipe is provided on the lower surface of the connecting plate. A pipe clamp is hermetically clamped at the bottom end of the rigid pipe. A support block is fixedly sleeved on the outer wall of the pipe clamp. A sealing rubber cover matching the water tank positioning template is fixedly connected to the outer wall of the support block. The outer wall of the sealing rubber cover is in sealed contact with the inner walls of the two water tank positioning templates. An input one-way valve is fixedly communicated with the top end of the rigid pipe. A micro solenoid valve and a pressure sensor are fixedly communicated with the pipe wall of the rigid pipe.

[0011] In the above-mentioned water tank welding tooling, the weld seam airtightness detection mechanism includes an air box, a display screen and an alarm fixedly connected to the upper surface of the U-shaped frame. A welding protective gas input valve is fixedly communicated with the outer wall of the air box. A micro one-way air extraction pump is fixedly communicated with the upper surface of the air box. The suction end of the micro one-way air extraction pump is fixedly communicated with a three-way reversing solenoid valve. One input end of the three-way reversing solenoid valve is fixedly communicated with the upper surface of the air box. The other input end of the three-way reversing solenoid valve is fixedly communicated with a leakage marking component. The output end of the micro one-way air extraction pump is fixedly communicated with a hose. The bottom end of the hose is fixedly communicated with the input end of the input one-way valve.

[0012] In the above-mentioned water tank welding tooling, the leakage marking assembly includes a suction pipe fixedly communicated with the input end of the three-way reversing valve. The outer wall of the suction pipe is fixedly sleeved with a hollow block. A pick-up hole is formed in the outer wall of the top end of the hollow block. The bottom end of the suction pipe passes through the inner wall of the top end of the hollow block and extends downward.

[0013] In the above-mentioned water tank welding tooling, the outer wall of the U-shaped frame is fixedly connected with a dry ice thermos bottle body and a master control panel. The top end of the dry ice thermos bottle body is threadedly and hermetically connected with a bottle cap.

[0014] In the above-mentioned water tank welding tooling, a spring is movably sleeved on the rod wall of the connecting rod. The two ends of the spring are respectively in contact with the inner wall of the cylinder and the outer wall of the sealing ring.

[0015] In the above-mentioned water tank welding tooling, the water tank positioning template is in a "U" shape, and the length dimension of one side of the water tank positioning template is 9 - 11 millimeters shorter than that of the other side.

[0016] Compared with the existing technology, the advantages of a water tank welding tooling are as follows:

[0017] 1. By setting the template closing mechanism, the water tank positioning template and the moving block, when the water tank bottom plate and the water tank body need to be welded, first place the water tank bottom plate and the water tank body between the two water tank positioning templates. Then, the second electric push rod is started. The second electric push rod makes the template closing mechanism work through the air pump and the connecting plate. The template closing mechanism pushes the two water tank positioning templates to close. When the water tank positioning templates are closed, they can automatically position the water tank bottom plate and the water tank body, and can also avoid damaging the thinner water tank. This mechanism enables the welding tooling to adapt to the welding positioning operation of thinner water tanks. It not only has the ability to automatically position the water tank components, but also can prevent the water tank from being deformed and damaged when clamped by the welding tooling.

[0018] 2. By means of the provided weld seam airtightness detection mechanism and air guiding mechanism, when the water tank welding fixture is in use, the welding protective gas is transported into the air box for storage through the welding protective gas input valve. Then, during welding, the weld seam airtightness detection mechanism and the air guiding mechanism transport the welding protective gas into the interior of the water tank. At this time, after the water tank bottom plate and the water tank body are squeezed and positioned by the water tank positioning template, the air leakage at the connection is relatively small, enabling the welding protective gas injected into the interior of the water tank to remain and generate air pressure. Additionally, the air pressure sensor can prevent the air pressure of the welding protective gas inside the water tank from being too high. Then, by arranging the welding protective gas with a certain air pressure inside the water tank, more comprehensive protection can be provided for the weld seam area, further reducing the adverse effects of oxidation and nitridation in the welding area. At the same time, the air pressure of the welding protective gas helps to control the flow and solidification of the molten pool, making the weld seam formation more beautiful, reducing defects such as undercut and lack of fusion. Additionally, the weld seam airtightness detection mechanism can also detect the airtightness of the welded water tank, enabling the welding fixture to not only have the function of assisting welding by arranging the welding protective gas inside the water tank.

[0019] 3. By means of the provided leakage marking assembly, when there is a leak point in the welding area after the water tank is welded, at this time, while the staff repeats the steps of detecting the airtightness of the water tank welding, an appropriate amount of dry ice is taken out from the dry ice thermos and placed inside the hollow block. Then, after the dry ice inside the hollow block comes into contact with the external environment, sublimation occurs and white mist is generated. The micro single-way air extraction pump inhales the air with white mist through the three-way reversing solenoid valve and the air suction pipe. The white mist air is transported into the interior of the water tank in a short time. Then, observe from which position of the water tank welding area the white mist leaks out. The position where the white mist leaks out is the leak point position of the water tank welding. Then, the staff promptly records this leak point position with a marker pen, which is convenient for the staff to perform subsequent repairs. This mechanism enables the water tank welding fixture to have the function of displaying the leak points of the water tank welding and facilitates the repair of defective water tanks by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a water tank welding fixture provided by the present invention;

[0021] Figure 2 is a schematic top view structural diagram of the water tank positioning template in a water tank welding fixture provided by the present invention;

[0022] Figure 3 is a schematic structural diagram of the weld seam airtightness detection mechanism in a water tank welding fixture provided by the present invention;

[0023] Figure 4 is a schematic structural diagram of the air guiding mechanism in a water tank welding fixture provided by the present invention;

[0024] Figure 5 is a schematic structural diagram of the elastic piece part in a water tank welding fixture provided by the present invention;

[0025] Figure 6 It is a schematic structural diagram of the spring part in a water tank welding tooling provided by the present invention.

[0026] In the figure: 1 support base, 2 connecting rod, 3 cross plate, 4 moving block, 5 PLC controller, 6 template closing mechanism, 61 cylinder, 62 sealing ring, 63 connecting rod, 64 rectangular block, 65 elastic sheet, 66 arc-shaped clamping block, 67 air pipe, 68 air pump, 7 air guiding mechanism, 71 third electric push rod, 72 fixed block, 73 rigid pipe, 74 pipe clamp, 75 support block, 76 sealing rubber cover, 77 input one-way valve, 78 micro solenoid valve, 79 air pressure sensor, 8 weld seam airtightness detection mechanism, 81 air box, 82 display screen, 83 alarm, 84 welding protective gas input valve, 85 micro one-way air extraction pump, 86 three-way reversing solenoid valve, 87 hose, 9 leakage marking component, 91 suction pipe, 92 hollow block, 93 picking and placing hole, 10 water tank positioning template, 11 connecting cylinder, 12 limit card slot, 13 first electric push rod, 14 U-shaped frame, 15 second electric push rod, 16 connecting plate, 17 dry ice thermos bottle body, 18 master control panel, 19 bottle cap, 20 spring. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Such as Figures 1-6As shown in the figure, a water tank welding tooling includes a support base 1. An opening is provided on the lower surface of the support base 1, and two connecting rods 2 are fixedly connected to the hole wall of the opening. The bottom ends of the two connecting rods 2 are fixedly connected to a cross plate 3. A moving block 4 that matches the opening is sleeved on the rod walls of the two connecting rods 2. Two water tank positioning templates 10 are movably connected to the upper surface of the moving block 4. The water tank positioning templates 10 are in a "U" shape, and the length dimension of one side of the water tank positioning template 10 is 10 millimeters shorter than that of the other side. After the two water tank positioning templates 10 are closed, a welding tooling seam will be jointly formed at the shorter position of the water tank positioning template 10. The welding working seam can facilitate the staff to use welding equipment to weld the water tank body. A connecting cylinder 11 is fixedly connected to the outer wall of the water tank positioning template 10, and a rectangular inner hole is provided on the inner wall of the connecting cylinder 11. A limiting card slot 12 is provided on the outer wall of the connecting cylinder 11. The top end of the cross plate 3 is fixedly connected to a first electric push rod 13, and the top end of the first electric push rod 13 is fixedly connected to the lower surface of the moving block 4. A U-shaped frame 14 is fixedly connected to the upper surface of the support base 1. A dry ice thermos bottle body 17 is fixedly connected to the outer wall of the U-shaped frame 14. The top end of the dry ice thermos bottle body 17 is threadedly and hermetically connected to a bottle cap 19. The dry ice thermos bottle body 17 can protect the dry ice and avoid excessive sublimation and waste of the dry ice.

[0029] A template closing mechanism 6 is fixedly connected to the outer wall of the U-shaped frame 14. The template closing mechanism 6 includes two cylinders 61 fixedly connected to the outer walls on both sides of the U-shaped frame 14. Fixed through holes that match the outer walls of the cylinders 61 are provided on the outer walls on both sides of the U-shaped frame 14. A sealing ring 62 is movably connected to the inner wall of the cylinder 61. A connecting rod 63 is fixedly connected to the inner wall of the sealing ring 62. A spring 20 is movably sleeved on the rod wall of the connecting rod 63. The two ends of the spring 20 are respectively in contact with the inner wall of the cylinder 61 and the outer wall of the sealing ring 62. When the connecting rod 63 extends outwards, the spring 20 is compressed to store energy. When the connecting rod 63 retracts, the compressed spring 20 can assist the connecting rod 63 to reset. The side end of the connecting rod 63 passes through the connecting hole of the cylinder 61 and extends outwards. A rectangular block 64 that matches the rectangular inner hole of the connecting cylinder 11 is fixedly connected to the outer side end of the connecting rod 63. A plurality of elastic sheets 65 are fixedly connected to the outer wall of the rectangular block 64. An arc-shaped clamping block 66 that matches the limiting card slot 12 is fixedly connected to the side of the elastic sheet 65 close to the connecting cylinder 11. Air pipes 67 are fixedly communicated with the side ends of the two cylinders 61. The top ends of the two air pipes 67 are fixedly communicated with an air pump 68. The outer wall of the air pump 68 is fixedly connected to the outer wall of the U-shaped frame 14. The top end of the lifting rod of the air pump 68 is fixedly connected to the lower surface of the connecting plate 16. This mechanism enables the welding tooling to adapt to the welding positioning operation of water tanks with relatively thin thicknesses. It not only has the ability to automatically position the water tank components but also can prevent the water tank from being deformed and damaged when clamped by the welding tooling.

[0030] A second electric push rod 15 is fixedly sleeved at the top end of the U-shaped frame 14. A connecting plate 16 is movably sleeved on one outer wall of the U-shaped frame 14. The top end of the connecting plate 16 is fixedly connected to the moving end of the second electric push rod 15. An air guiding mechanism 7 is fixedly connected to the upper surface of the connecting plate 16. The air guiding mechanism 7 includes a third electric push rod 71 fixedly connected to the upper surface of the connecting plate 16. The top end of the third electric push rod 71 is fixedly connected to a fixing block 72. A through hole is formed in the upper surface of the fixing block 72, and the inner wall of the through hole is fixedly connected to a rigid pipe 73. The bottom end of the rigid pipe 73 passes through the lower surface of the connecting plate 16. An installation hole matching with the rigid pipe 73 is formed in the lower surface of the connecting plate 16. A pipe clamp 74 is hermetically clamped at the bottom end of the rigid pipe 73. A support block 75 is fixedly sleeved on the outer wall of the pipe clamp 74. A sealing rubber cover 76 matching with the water tank positioning template 10 is fixedly connected to the outer wall of the support block 75. The outer wall of the sealing rubber cover 76 is in sealing contact with the inner walls of the two water tank positioning templates 10. An input one-way valve 77 is fixedly communicated with the top end of the rigid pipe 73. A micro solenoid valve 78 and a pressure sensor 79 are fixedly communicated with the pipe wall of the rigid pipe 73. This welding tooling also has the function of assisting welding with welding protective gas arranged inside the water tank, which can effectively improve the reliability of the use of the welding tooling and the success rate of water tank welding.

[0031] A PLC controller 5 and a weld seam airtightness detection mechanism 8 are fixedly connected to the upper surface of the U-shaped frame 14. The weld seam airtightness detection mechanism 8 includes an air tank 81, a display screen 82 and an alarm 83 fixedly connected to the upper surface of the U-shaped frame 14. A welding protective gas input valve 84 is fixedly communicated with the outer wall of the air tank 81. A micro one-way air extraction pump 85 is fixedly communicated with the upper surface of the air tank 81. The suction end of the micro one-way air extraction pump 85 is fixedly communicated with a three-way reversing solenoid valve 86. One input end of the three-way reversing solenoid valve 86 is fixedly communicated with the upper surface of the air tank 81. The other input end of the three-way reversing solenoid valve 86 is fixedly communicated with a leakage marking component 9. The leakage marking component 9 includes a suction pipe 91 fixedly communicated with the input end of the three-way valve. A hollow block 92 is fixedly sleeved on the outer wall of the suction pipe 91. A pick-and-place hole 93 is formed in the outer wall of the top end of the hollow block 92. The bottom end of the suction pipe 91 passes through the inner wall of the top end of the hollow block 92 and extends downward. This mechanism enables the water tank welding tooling to have the function of displaying the leakage points of water tank welding and facilitates the repair of defective water tanks by the staff. The output end of the micro one-way air extraction pump 85 is fixedly communicated with a hose 87. The bottom end of the hose 87 is fixedly communicated with the input end of the input one-way valve 77. This mechanism enables the water tank welding tooling to have the function of detecting the airtightness of water tank welding, eliminating the need for the staff to transfer the water tank to the airtightness detection station, saving time and effort, and improving the convenience and efficiency of water tank welding processing.

[0032] The outer wall of the U-shaped frame 14 is fixedly connected with a master control panel 18. The third electric push rod 71, the micro one-way air extraction pump 85, the three-way reversing solenoid valve 86, the second electric push rod 15 and the first electric push rod 13 are all electrically connected to the master control panel 18 through wires. The air pressure sensor 79 is electrically connected to the input end of the PLC controller 5 through a wire. The micro solenoid valve 78, the display screen 82 and the alarm 83 are all electrically connected to the output end of the PLC controller 5 through wires. The above electrical connections and energized devices are all prior arts and will not be elaborated here.

[0033] Now, the operation principle of the present invention is described as follows: When the circulating water tank is in welding production, first select the water tank positioning template 10 that matches the water tank, and install the water tank positioning template 10 on the template closing mechanism 6 through the connecting cylinder 11, the limit card slot 12, the rectangular block 64 and the arc-shaped clamping block 66. Then place the water tank bottom plate and the water tank body between the two water tank positioning templates 10. The water tank bottom plate contacts the upper surface of the moving block 4. Then start the second electric push rod 15 through the master control panel 18. The second electric push rod 15 pushes the lifting rod of the air pump 68 downward. Then the air inside the air pump 68 is transported to the two cylinders 61 through the air pipe 67. The air in the two cylinders 61 pushes the connecting rod 63 through the sealing ring 62. Finally, the connecting rod 63 pushes the two water tank positioning templates 10 to close through the rectangular block 64 and the connecting cylinder 11. When the water tank positioning templates 10 are closed, they can push the welding joints of the water tank body to be automatically aligned. At the same time, the water tank bottom plate is also automatically aligned with the water tank body, saving time and effort. After the water tank positioning templates 10 are closed, a welding working seam will be formed on the side with a shorter length dimension of the water tank positioning templates 10. The welding working seam can facilitate the staff to weld the water tank body through the welding equipment. During the welding process, the staff can not only weld the water tank body, but also fixedly weld the water tank bottom plate to the bottom of the water tank body, so that the water tank bottom plate and the water tank body will no longer have displacement changes. This welding tooling positioning method will not cause deformation damage to the relatively thin water tank. Immediately afterwards, the staff starts the first electric push rod 13 and the third electric push rod 71 through the master control panel 18. The first electric push rod 13 and the third electric push rod 71 contract simultaneously. The contraction of the first electric push rod 13 drives the moving block 4 to move downward. The contraction of the third electric push rod 71 pushes the water tank downward through the rigid pipe 73, the support block 75 and the sealing rubber cover 76, so that the welding position of the water tank bottom plate is exposed and it is convenient for the staff to perform welding treatment on the water tank bottom plate;

[0034] And when the water tank welding tooling is in use, the welding shielding gas is also transported into the gas tank 81 for storage through the welding shielding gas input valve 84. Then, during welding, the micro single-direction air extraction pump 85 is started through the master control panel 18. The micro single-direction air extraction pump 85 extracts the welding shielding gas in the gas tank 81 through the three-way reversing solenoid valve 86. The welding shielding gas is transported to the rigid pipe 73 through the hose 87 and the input check valve 77, and finally transported into the water tank. After the water tank bottom plate and the water tank body are squeezed and positioned by the water tank positioning template 10, the air leakage at the connection is small, so that the welding shielding gas injected into the water tank can remain and generate air pressure. In addition, the air pressure sensor 79 can prevent the air pressure of the welding shielding gas inside the water tank from being too high. When the air pressure of the welding shielding gas inside the water tank exceeds the warning air pressure preset by the air pressure sensor 79, the air pressure sensor 79 sends an electrical signal to the PLC controller 5. The PLC controller 5 controls the micro solenoid valve 78 to open for air leakage. And during the water tank welding process, by arranging the welding shielding gas with a certain air pressure inside the water tank, more comprehensive protection can be provided for the weld area, further reducing the adverse effects of oxidation and nitridation in the welding area. At the same time, the air pressure of the welding shielding gas helps to control the flow and solidification of the molten pool, making the weld formation more beautiful and reducing the defects of undercut and lack of fusion. This mechanism enables the welding tooling to adapt to the welding positioning operation of thin-walled water tanks. It not only has the ability to automatically position the water tank components, but also can prevent the water tank from being deformed and damaged when clamped by the welding tooling. In addition, this welding tooling also has the function of arranging welding shielding gas inside the water tank to assist welding, which can effectively improve the reliability of the welding tooling and the success rate of water tank welding.

[0035] When the water tank welding is completed, the three-way reversing solenoid valve 86 and the micro single-direction air extraction pump 85 are started through the master control panel 18. After the three-way reversing solenoid valve 86 is powered on, its conduction direction changes. Then, the micro single-direction air extraction pump 85 sucks the outside air into the rigid pipe 73 through the three-way reversing solenoid valve 86 and the air suction pipe 67, and finally the air is transported to the welded water tank. And the air supply stops before the air pressure inside the water tank reaches the warning air pressure of the air pressure sensor 79. During this process, the air pressure sensor 79 can detect the change of the air pressure inside the water tank in real time. The air pressure sensor 79 transports the air pressure inside the water tank to the PLC controller 5 in the form of an electrical signal. The PLC controller 5 then feeds back the air pressure data to the display screen 82 for display, which is convenient for the staff to view. After the micro single-direction air extraction pump 85 stops supplying air, the staff observes the data on the display screen 82 for 3 minutes. If the data on the display screen 82 does not change within 3 minutes, it means that the water tank welding is good without leakage points. If the data on the display screen 82 decreases within 3 minutes, it means that there are leakage points in the water tank welding, and the alarm 83 is controlled by the PLC controller 5 to send an alarm message, and repair is required. This mechanism enables the water tank welding tooling to have the function of detecting the welding airtightness of the water tank, eliminating the need for the staff to transfer the water tank to the airtightness detection station, saving time and effort, and improving the convenience and efficiency of water tank welding processing.

[0036] When there is a leak point in the welding area after the water tank is welded, at this time, while the staff repeats the above steps for detecting the sealing performance of the water tank welding, an appropriate amount of dry ice is taken out from the dry ice thermos 17 and placed in the hollow block 92. Then, after the dry ice in the hollow block 92 comes into contact with the external environment, it will sublimate and generate white mist. The micro single-way air pump 85 inhales the air with white mist through the three-way reversing solenoid valve 86 and the suction pipe 67. The white mist air is transported into the water tank within a short time. Then, observe from which position of the water tank welding area the white mist leaks out. The position where the white mist leaks out is the leak point position of the water tank welding. Then, the staff timely records the leak point position with a marker pen, which is convenient for the staff to perform subsequent repairs. This mechanism enables the water tank welding tooling to have the function of displaying the leak points of the water tank welding and is convenient for the staff to repair the defective water tanks.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water tank welding tooling, including a support base (1), characterized in that, The lower surface of the support base (1) is provided with an opening, and the hole wall of the opening is fixedly connected with two connecting rods (2). The bottom ends of the two connecting rods (2) are fixedly connected with a cross plate (3). A moving block (4) matching the opening is sleeved on the rod walls of the two connecting rods (2). The upper surface of the moving block (4) is movably connected with two water tank positioning templates (10). The outer wall of the water tank positioning template (10) is fixedly connected with a connecting cylinder (11), and a rectangular inner hole is opened on the inner wall of the connecting cylinder (11). A limiting card slot (12) is opened on the outer wall of the connecting cylinder (11). The top end of the cross plate (3) is fixedly connected with a first electric push rod (13), and the top end of the first electric push rod (13) is fixedly connected with the lower surface of the moving block (4). The upper surface of the support base (1) is fixedly connected with a U-shaped frame (14), and a template closing mechanism (6) is fixedly connected to the outer wall of the U-shaped frame (14); The top end of the U-shaped frame (14) is fixedly sleeved with a second electric push rod (15). A connecting plate (16) is movably sleeved on one outer wall of the U-shaped frame (14). The top end of the connecting plate (16) is fixedly connected with the moving end of the second electric push rod (15). A gas guiding mechanism (7) is fixedly connected to the upper surface of the connecting plate (16); A PLC controller (5) and a weld airtightness detection mechanism (8) are fixedly connected to the upper surface of the U-shaped frame (14); The template closing mechanism (6) includes two cylinders (61) fixedly connected to the outer walls on both sides of the U-shaped frame (14). Fixed through holes matching the outer walls of the cylinders (61) are opened on the outer walls on both sides of the U-shaped frame (14). A sealing ring (62) is movably connected to the inner wall of the cylinder (61). A connecting rod (63) is fixedly connected to the inner wall of the sealing ring (62). The side end of the connecting rod (63) passes through the connecting hole of the cylinder (61) and extends outwards. A rectangular block (64) matching the rectangular inner hole of the connecting cylinder (11) is fixedly connected to the outer side end of the connecting rod (63). A plurality of elastic sheets (65) are fixedly connected to the outer wall of the rectangular block (64). An arc-shaped clamping block (66) matching the limiting card slot (12) is fixedly connected to the side of the elastic sheet (65) close to the connecting cylinder (11). Air pipes (67) are fixedly communicated with the side ends of the two cylinders (61). The top ends of the two air pipes (67) are fixedly communicated with an air pump (68). The outer wall of the air pump (68) is fixedly connected with the outer wall of the U-shaped frame (14). The top end of the lifting rod of the air pump (68) is fixedly connected with the lower surface of the connecting plate (16); The air guiding mechanism (7) includes a third electric push rod (71) fixedly connected to the upper surface of the connecting plate (16). The top end of the third electric push rod (71) is fixedly connected with a fixing block (72). A through hole is formed in the upper surface of the fixing block (72), and a rigid tube (73) is fixedly connected to the hole wall of the through hole. The bottom end of the rigid tube (73) passes through the lower surface of the connecting plate (16). An installation hole matching with the rigid tube (73) is formed in the lower surface of the connecting plate (16). The bottom end of the rigid tube (73) is hermetically clamped with a tube clamp (74). A support block (75) is fixedly sleeved on the outer wall of the tube clamp (74). A sealing rubber cover (76) matching with the water tank positioning template (10) is fixedly connected to the outer wall of the support block (75). The outer wall of the sealing rubber cover (76) is in sealing contact with the inner walls of the two water tank positioning templates (10). The top end of the rigid tube (73) is fixedly communicated with an input one-way valve (77). A micro solenoid valve (78) and a pressure sensor (79) are fixedly communicated with the pipe wall of the rigid tube (73). The weld seam airtightness detection mechanism (8) includes an air tank (81), a display screen (82) and an alarm (83) fixedly connected to the upper surface of the U-shaped frame (14). A welding protective gas input valve (84) is fixedly communicated with the outer wall of the air tank (81). A micro one-way air extraction pump (85) is fixedly communicated with the upper surface of the air tank (81). The suction end of the micro one-way air extraction pump (85) is fixedly communicated with a three-way reversing solenoid valve (86). One input end of the three-way reversing solenoid valve (86) is fixedly communicated with the upper surface of the air tank (81). The other input end of the three-way reversing solenoid valve (86) is fixedly communicated with a leakage marking assembly (9). The output end of the micro one-way air extraction pump (85) is fixedly communicated with a hose (87). The bottom end of the hose (87) is fixedly communicated with the input end of the input one-way valve (77).

2. The water tank welding tooling according to claim 1, characterized in that, The leakage marking assembly (9) includes a suction pipe (91) fixedly communicated with the input end of the three-way reversing valve. A hollow block (92) is fixedly sleeved on the outer wall of the suction pipe (91). A pick-and-place hole (93) is formed in the outer wall of the top end of the hollow block (92). The bottom end of the suction pipe (91) passes through the inner wall of the top end of the hollow block (92) and extends downward.

3. A water tank welding tooling according to claim 1, characterized in that, A dry ice thermos bottle body (17) and a total control panel (18) are fixedly connected to the outer wall of the U-shaped frame (14). The top end of the dry ice thermos bottle body (17) is threadedly and hermetically connected with a bottle cap (19).

4. A water tank welding tooling according to claim 1, characterized in that, A spring (20) is movably sleeved on the rod wall of the connecting rod (63). The two ends of the spring (20) are respectively in contact with the inner wall of the cylinder (61) and the outer wall of the sealing ring (62).

5. The water tank welding tooling according to claim 1, characterized in that, The water tank positioning template (10) is in a "U" shape, and the length dimension of one side of the water tank positioning template (10) is 9-11 millimeters shorter than that of the other side.

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