Water-cooled back slide block VEGW (vertical electrogas welding) equipment with water-cooling pipe quick-change joint

The invention discloses a water-cooled back slide block VEGW equipment with a water-cooling pipe quick-change joint, which adopts the structure that a rectangular cooling water through-pipe means (6) is arranged on a rack body and is provided with two parallel cooling water passages therein extended horizontally; and the water-cooling pipe quick-change joint is sleeved at the front end of the rectangular cooling water through-pipe means (6) and comprises a rigid body (32), water pipe joints (26), a compress rod (31) and other devices. According to the invention, with the cooling water pipe quick-change joint, the quick, convenient and reliable connection between the rectangular cooling water through pipe and a circulation water tank water pipe is ensured, so as to realize reliable sealing connection of a cooling water input/output joint system. The VEWG water-cooled back slide block is reusable and can be mounted quickly and reliably under condition of different plate thicknesses so as to ensure the real-time