The invention belongs to the field of plastic
pipe manufacturing, and particularly discloses a vacuum spraying box with an automatic
water level control function. The vacuum spraying box comprises a vacuum spraying box body. The inner wall of the bottom end of the vacuum spraying box body is connected with a vertically-arranged partition, a sliding groove is formed in one side of the partition, asliding block is slidingly connected into the sliding groove, the side, away from the sliding groove, of the sliding block is connected with a connecting rod, the side, away from the sliding block, ofthe connecting rod is connected with a float
ball valve, the side, away from the connecting rod, of the float
ball valve is connected with a sleeve, the interior of the sleeve is connected with a spring, the end of the spring is connected with a mounting plate, the mounting plate stretches out of the sleeve, and a conductive wheel is rotationally connected between the inner walls of the two sidesof the mounting plate. The
water level in the vacuum spraying box can be guaranteed, thus, it is guaranteed that the change of the pressure and the stability of cooling water slightly fluctuates, thepercent of pass of production of plastic pipes is increased, a filter plate at the position of a water outlet of the spraying box can be cleaned through the device, blockage of the water outlet is avoided, and the vacuum spraying box is suitable for being popularized.