2results about How to "Reduce overhang length" patented technology

The application relates to the technical field of grinding equipment, and particularly discloses an electric tool output shaft mandrel positioning grinding equipment. The electric tool output shaft mandrel positioning grinding equipment comprises a spindle box and a grinding device, the spindle box is provided with a spindle, the spindle is provided with a self-centering clamping mechanism, the grinding device comprises a rack, a first driving device and a second driving device, the rack is provided with a rotating disc through a hollow shaft base, a plurality of sliding grooves are arranged on the rack, sliding seats are arranged in the sliding grooves, hollow guide pins and axles are arranged on the sliding seats, and a grinding wheel and a driven wheel are arranged on the axles; a guide groove matched with the hollow guide pins is arranged on the rotating disc, the rotating disc is driven by the second driving device, and all the driven wheels are driven by the first driving device. When fine grinding is carried out, the grinding wheel simultaneously works around the output shaft mandrel, the circumferential grinding cutting forces on the output shaft mandrel are offset, and the problems of position deviation, bending deformation and machining vibration caused by unilateral force on the output shaft mandrel are avoided, and the fine grinding precision is obviously improved.

This utility model discloses a grid structure for dredging and maintenance of an inverted siphon culvert. It includes a vertical shaft with a horizontal grid at the shaft opening. A debris-blocking opening is formed on the side wall of the shaft, and a debris-blocking grid is vertically installed inside the debris-blocking opening. The horizontal grid is composed of multiple sub-grid components to cover the shaft opening. A support beam is provided inside the shaft opening to support the sub-grid components. The length direction of the support beam is parallel to the length direction of the debris-blocking opening. The multiple sub-grid components are divided into a first sub-grid and a second sub-grid. The opposite ends of the first sub-grid are respectively installed on support steps opposite each other at the shaft opening. One end of the second sub-grid is installed on a support step on one side of the shaft opening, and its opposite end extends above the debris-blocking opening and is supported by the debris-blocking grid. This utility model can disassemble the horizontal grid into multiple sub-grids to reduce the weight of a single piece, and can also provide a central support beam to reduce the rigidity requirements of the sub-grids, thereby reducing thickness and weight, and facilitating manual handling.