2results about How to "Improve impact absorption performance" patented technology

This invention provides a yarn holding force control device and method, including an upper yarn guide plate, a lower yarn guide plate, a yarn holding force adjustment device, and a controller. The yarn holding force adjustment device comprises at least one yarn holding force adjustment unit, an actuating rotary element, and a mounting frame. The yarn holding force adjustment unit is located on the mounting frame between the upper and lower yarn guide plates and includes a rotating shaft, a turntable, and a yarn holding assembly. The actuating rotary element and the rotating shaft are respectively disposed on both sides of the mounting frame. The actuating rotary element is connected to one end of the rotating shaft, and the turntable is disposed on the other end of the rotating shaft. The yarn holding assembly forms a zigzag yarn path with an adjustable bending angle on the turntable and the mounting frame. The controller controls the actuating rotary element to drive the rotating shaft and the turntable to rotate, automatically adjusting the yarn holding force passing through the zigzag yarn path. This ensures stable control of the yarn during high-speed winding and features a simple structure that is easy to maintain.

The present application relates to the technical field of plastic track, especially to the IPC E01C13 field, and more particularly to a prefabricated track coiled material and a preparation method thereof.The prefabricated track coiled material comprises a bottom adhesive (1) and a prefabricated coiled material (2), and the preparation of the prefabricated coiled material (2) comprises an A component and a B component, wherein the raw materials of the A component comprise 65-80 parts of polyether polyol, 20-35 parts of diisocyanate; the raw materials of the B component comprise 10-20 parts of polyether polyol, 8-15 parts of polyurethane crosslinking agent, 15-20 parts of plasticizer, 0.5 parts of color paste, 40-55 parts of filler and 2-5 parts of drier.The polyether polyol comprises polyether polyol with a molecular weight of 2000 and polyether polyol with a molecular weight of 5000, and the weight ratio of the polyether polyol with a molecular weight of 2000 to the polyether polyol with a molecular weight of 5000 in the A component is 1:(1.5-3), which can improve the tensile strength (1.24 MPa) and impact absorption performance (43%) of the coiled material.