This equipment has several advantages: first, the walking track, walking device and spraying system carefully designed according to the shape and size of box girder can well meet the requirements of all-round spraying maintenance of box girder, greatly improve the maintenance quality and efficiency, and ensure the concrete strength of precast box girder. Secondly, the walking device will not reverse immediately after touching the limit switch at the end of the box beam, but will automatically delay for two seconds before going back, which greatly increases the service life of the motor and equipment. Thirdly, the timer is added to the control circuit, which can freely set the working time and stopping time of machine spraying every day, greatly reducing the tedious work of manual start-stop Fourth, greatly reduce the labor intensity. According to the beam speed of three beams in two days, the maintenance cycle is seven days, and two people are needed every day, and the maintenance needs 14 person-times. Both of them use spray system, and only one person needs to set the maintenance time range, carry out daily maintenance of the system and check whether the water supply is sufficient. Five, improve labor productivity, using automatic spray curing system, a spray beam to achieve all-round, all-wet curing quality standards, according to the weather, temperature and beam slab curing stage only 3-4 minutes. Six, the system parts procurement, installation and maintenance is convenient. The accessories required by the system can be bought in the general electrical components market and hardware market.

The electrical control part of spraying equipment is completely based on relay control system, which mainly uses contactor, intermediate relay and time relay to realize functions such as automatic round trip and delay waiting. It has the functions of power-on self-start and limit automatic protection (return). Under the control of the time-controlled switch, the automatic start-stop function can be realized without supervision, and the automatic, self-checking and self-starting functions of the equipment can be realized.