Metal hose connector shielded welding device

[0033] Embodiment one

[0034] This embodiment is a protective welding device for metal hose joints used in cookers, and its basic structure is as follows: figure 1 As shown, it includes a ventilation interface 1, a closed cavity unit 2, a joint assembly positioning unit 3, a welding torch telescopic positioning unit 5, and a metal bellows unit 4 is placed in the joint assembly positioning unit 3 for welding positioning.

[0035] combine figure 2 It can be seen that the cylindrical hollow airtight chamber 205 as the main body of the airtight chamber unit 2 is supported on the vertical brackets 201 at its two ends, the front side has a welding observation port 204 for inserting the arc filter eyepiece 203, and the upper part is supported by a powerful magnetic block 206 The welding torch gasket 207 is fixed, and the middle part of the welding torch gasket 207 has a welding torch insertion hole. The two ends of the airtight chamber 205 are respectively equipped with a positioning end cap 202 and an insertion end cap 210 through a gasket 208, wherein the insertion end cap 210 has a central perforation equipped with a diaphragm rubber gasket 209, and the diaphragm rubber gasket 209 consists of a set of The long side as the outer end is fixed on the central perforation circle, and the short side is used as the inner end to elastically close the trapezoidal rubber sheet. The adjacent waists of each trapezoidal rubber sheet are matched with each other, and the short sides of each trapezoidal rubber sheet enclose the closed aperture. The insertion hole of the positioning slider matching the outer diameter of the positioning core rod; in this way, the elastic deformation of each trapezoidal rubber sheet allows the positioning slider to pass through, and once it passes through, because its closed diameter after elastic reset matches the positioning core rod, Therefore, an ideal airtight chamber can be formed, which is convenient for filling with protective gas. The positioning end cap 202 is fixed to a guide core rod 303 protruding from the insertion hole of the positioning end cap through the airtight chamber. In addition, the positioning end cap 202 is equipped with a ventilation interface 1 for introducing protective gas, and the ventilation interface 1 is composed of image 3 The shielding gas system shown provides shielding gas such as argon or nitrogen on demand, and the gas source 101 of the system passes through the pressure gauge 102, pressure regulator 103, flow meter 104 and solenoid valve 105 in sequence, and enters through the ventilation interface 1 The airtight cavity unit 2 plays a protective role in the welding process.

[0036] Joint assembly positioning unit 3 such as Figure 4 and Figure 5 As shown, it includes a guide core rod 303 , a locking nut 301 , and a pipe thread positioning slider 302 . The outer circle of the guide core rod 303 matches the passage of the metal bellows. The left end of the guide core rod 303 has threads, and is fixed at the center of the positioning end cap 202 by a lock nut 301 .

[0037] The pipe thread positioning slide block 302 is sleeved on the guide core rod 303, forming a horizontal movement pair with it. The lower side of the guide core rod 303 has an axially extending keyway, and the positioning slider 302 has a moving fit protruding key structure embedded in the keyway, so the positioning slider 302 can only slide relative to each other in the axial direction and cannot rotate in the circumferential direction. The positioning slider 302 is composed of a slider body 3021 and a positioning ring 3022 embedded in the center hole of the slider body to act as an axial limiter. The upper part of the outer section of the slider body 3021 is open, and the lower part has a shaft that matches the shape of the joint assembly to be welded. The centering depression toward the limit position can conveniently put the joint assembly 401 to be welded into it and center the limit position, avoiding movement interference welding during the nut welding process, and after the welding is completed, the positioning slider can be pulled out of the closed cavity with the metal bellows, Realize repeated welding operations.

[0038] The telescopic positioning unit 5 of the welding torch is placed on one side of the closed cavity unit 2, such as Image 6 As shown, it contains an argon arc welding torch 501, a welding torch clamp block 502, and a three-axis telescopic cylinder 505 (purchased from AirTAC Company TCM10×20 type). In the hole, the welding torch at the middle part of the welding torch sealing pad 207 is inserted into the hole at the gun head.

[0039] The welding torch clamping block 502 is installed on the telescopic moving end of the three-axis telescopic cylinder 505 through the bolt 504, and can move as required along the welding torch insertion hole of the welding torch gasket 207 under the drive of the telescopic cylinder.

[0040] The metal hose to be welded in this embodiment is a metal bellows with G1/2 thread connection structure, as shown in 7, including G1/2 joint assembly 401, socket type threaded joint assembly 405, bellows 403, buckle ring 402, PVC coating Layer 404, G1/2 joint assembly 401 is composed of welded pipe 4011 and G1/2 nut 4012, 2-3 waves are reserved at both ends, the buckle ring 402 is inserted before welding, and the ring wave at the end of the bellows is connected with the welded pipe 4011. Butt girth welding.

[0041] When using the shielded welding device for metal hose joints for cooking appliances in this embodiment to carry out welding, first place the fixed-length corrugated pipe assembly coated with plastic on the corrugated pipe on the welding workbench, take out one end of the corrugated pipe assembly and put a buckle ring on it to cover Layer end, so that the end of the buckle ring fits with the end of the cladding layer and exposes 2-3 complete waves for welding, pull out the positioning slider to the rightmost end of the guide core rod, and put the assembled joint assembly into in the semicircular locating recess at the right end of the locating slider (see Figure 8 ). Next, align one end of the assembled corrugated pipe with the tail end of the welded pipe in the semi-circular positioning depression, move the corrugated pipe assembly toward the closed cavity to the position where the positioning end cover of the closed cavity is positioned, and start the telescopic positioning unit of the welding torch to make the welding torch automatically Descending to the butt weld position of the welded nipple and the bellows (see Figure 9 ), through the shielding gas for welding pre-protection. After that, start argon arc welding butt welding spot welding. After the spot welding is completed, rotate the bellows body assembly for 360° circular welding. After welding, close the argon arc welding, stay in the closed chamber for 1-3 seconds, and then raise the welding torch. Turn off the shielding gas, pull out the welded metal bellows at one end along the guide core rod, and bring out the positioning slider from the sealed cavity at the same time. Then turn around and repeat the above process to carry out the welding of the other end.

[0042] Embodiment two

[0043] The basic structure of the shielded welding device for metal hose joints used in cooktops in this embodiment is the same as that of the embodiment, except that the metal hoses to be welded are such as Figure 10 As shown, it is a metal bellows with a socket threaded connection structure, which includes a socket threaded joint assembly 405, a bellows 403, a buckle ring 402, and a PVC coating 404. The socket thread assembly 405 is composed of a socket thread 4052 and a welded joint 4051. The corrugated pipe 403 is covered with a layer of PVC coating 404 and 2-3 corrugations are reserved at both ends. Before the two ends are welded, the crimping ring 402 is inserted. For this reason, its joint assembly positioning unit 3 such as Figure 11 and Figure 12 As shown, it includes a guide core rod 303, a lock nut 301, and a socket-type positioning slider 304, so the slider body of the positioning slider 304 is slightly different from that of the first embodiment.

[0044] Practice has shown that the protective welding device for metal hose joints for cooktops in this embodiment above has the following advantages:

[0045] 1. The metal bellows welding is carried out by using the joint protection welding process, and the multiple processes of protection welding, fast clamping and feeding, and automatic positioning are integrated to realize the rapid replacement of metal hose tooling for stoves with two joint component structures, which effectively improves Welding quality and positioning accuracy. Compared with the traditional welding process, the shielded welding device provides precise automatic positioning technology, atmosphere protection atmosphere in the welding process and fast feeding mechanism of joint components, which solves the problem of poor quality of traditional welding seam, high degree of oxidation, welding torch Difficult positioning, low welding efficiency and other problems.

[0046] 2. The special structural design of the pipe thread and socket thread positioning slider mechanism cleverly solves the feeding problem of the joint assembly, realizes the feeding process of the pipe body and brings the joint assembly into the closed cavity, and the semi-circular structure can be finished after welding Finally, it can be pulled out together, and at the same time, it can also ensure that the nut does not move during the welding process and interfere with the welding.

[0047] 3. Relying on the ventilation interface mechanism, the functions of active gas protection during welding, rapid cooling during welding, and automatic gas cut-off after welding can be realized. Cheap protective gases such as nitrogen can be used to reduce the cost of protective gas, while ensuring the appearance quality of product welding.

[0048] 4. The specially designed airtight cavity unit has real-time observation of the welding process. The entrance of the welding torch is sealed and protected by flexible silicon rubber skin. The entrance of the pipe body adopts a diaphragm structure to solve the feeding and sealing problems of large joint nuts and small pipe bodies. And the minimum chamber design scheme is adopted to realize the minimum leakage of shielding gas and the maximum shielded welding during the welding process.