The safety load of the vice refers to the load of a pair of vice. The thickness of the lifting steel plate of the hydraulic jack company refers to the thickness of the safety lifting steel plate. The specific opening of the vice should exceed the thickness of the steel plate. The instructions and safety criteria for heavy tongs in horizontal lifting are as follows:

1. When the thickness of the lifting place exceeds the application field of the horizontal pliers, the horizontal pliers shall be removed and replaced. The screw jack company prohibits overweight application.

2. In specific application, a gap should be left between the steel plate and the floor, and the size of the gap should be slightly larger than the thickness of the bottom of the hanging pliers. Manually open the pliers tongue to the large opening, clamp the pliers on the steel plate, with one side of the steel plate touching the inside side of the pliers as a standard. Check before lifting. The key point of the steel plate should be located at the center of the irregular shape formed by the two sets of pliers. After lifting the steel plate, the steel plate should be level. When the Angle of intersection between the steel plate and the plane exceeds 7°, the cross-clamp part should be adjusted again. Especially in the situation of paying attention to the pillars of the material, then the Angle of the steel plate and the plane can not exceed 5 read, otherwise be sure to reload.