The high shear screw can make some small particles which are not completely melted cross the gap between the auxiliary thread and the feed cylinder to be melted by high shear, and the melting rate is improved. The productivity of high shear screw is higher than that of low shear screw.

The extrusion pressure of low shear screw is greater than that of high shear screw

Low shear screw energy consumption is lower than high shear screw, can achieve low energy extrusion.

Materials with low viscosity are subject to small shear stress when entering high shear zone, while materials with high viscosity are subject to large shear stress, resulting in different frictional heat.

Shear, is the effect of distortion of objects, is the abbreviation of shear stress and shear strain.

Screw extruder, a device widely used in melting spinning, hot melt plastic molding, rubber products production. Composed of screw and sleeve, the material is transported, compressed, cut and measured in the middle to complete the heating and homogenization of transportation.

After the utility model discloses a shear screw screw shear fracture surface level off, smooth, including the base, on the base of blade, rotating set on the fixed knife and to match the fixed knife knife, hinged on the base of the tube and fixed on the base of the tube, the tube set on waist type hole, connection plate is moving blade on one side of the connection, setting of connection plate has a guide pin, guide pin, the waist shape hole on the tube, there hold the screw of the fixed knife set on shear, set up to accommodate the screw and the moving knife to match the constant shear mouth of dynamic shear, described the base through the torsional spring hinge with hook, fixed knife between the moving blade and hook, The upper pipe is provided with a push block that can push the supporting hook to rotate and can rotate the bending part of the supporting hook to a straight line with the fixed and dynamic shear ports. The advantages of the utility model are as follows: the screw is fixed by the support hook, so as to ensure that the screw will not rotate under the influence of shear torsion during shearing, so as to ensure the smooth and smooth fracture of the screw and improve the appearance and use of the screw.

Patent description: screw shears

Technical field

The utility model relates to a screw shear.

Background technology

common screw shear, including the base, on the base of blade, rotating set on the fixed knife and to match the fixed knife knife, hinged on the base of the tube and fixed on the base of the tube, the tube set on waist type hole, connection plate is moving blade on one side of the connection, setting of connection plate has a guide pin, guide pin, the waist shape hole on the tube, there hold the screw of the fixed knife set on shear, set up to accommodate the screw and the moving knife to match the constant shear mouth of dynamic shear. Cut the screw in the actual use of time, because the screw is in constant shear and dynamic shear mouth mouth, at the time of shear, screw torque by the shear, for shear and dynamic shear head in order to adapt to a variety of specifications of the screw, usually larger than the screw diameter, screw under the effect of shear torsion is easy to turn, so that after cutting, screw fracture will tilt and uneven, such influence is beautiful and the use of the screw.