The spoke-type load cell, as the name suggests, resembles a wheel. The spokes are symmetrically distributed in pairs between the hub and the wheel rims, with four spokes being the most common. The measurement range is mostly from 1t to 100t. It features low height and good stability. Strong resistance to eccentric and lateral loads; It has good linearity and repeatability. The elastic element is a symmetrical integral structure, and its thermal expansion is basically the same in all directions with a low temperature coefficient. By designing upper and lower annular diaphragms, welding sealing can be achieved, and it has good long-term stability. It features an overload protection capacity of up to 300% through an overload protection gap of about 0.2mm between the hub and the support bottom surface. It has been attracting the attention of electronic weighing instrument manufacturers in various countries since the 1970s and is also one of the more frequently chosen structural types. Due to the fact that traditional spoke-type elastic elements require the use of electrical discharge wire cutting technology and equipment in the mechanical processing of forming multiple pairs of spokes, the process difficulty is increased, the production efficiency is low and the cost is high. In addition, the stiffness design of the wheel hub and wheel rim is improper, resulting in the hysteresis error of the load cell

It is large and difficult to control. In order to overcome the above-mentioned shortcomings of the traditional spoke-type load cell, improve the mechanical processing method, enhance the manufacturing processability and reduce the production cost, the American interface Company conducted a mechanical analysis of the structure of the traditional spoke-type elastic element, improved the formation method of the spoke-type strain zone, and replaced the electrical discharge wire cutting processing technology with the precision drilling process to form the wheel

The spokes not only enhance work efficiency but also significantly improve the dimensional accuracy and surface finish of the spokes. The actual measurement results prove that since the spokes are formed by precise drilling technology, not only is the structural symmetry high, but also the stiffness at both ends of the spokes is increased, the linearity of the load cell is improved, and the hysteresis error is reduced. In the mechanical processing technology of the new type of spoke-type load cell, four pairs of double holes or double connected holes are symmetrically processed by precision drilling on the concentric circle of the integral elastic element structure, thus forming four spokes (i.e., two strain beams). At this point, the spokes attached to the single shear resistance strain gauge become strain beams with variable cross-sections. The root stiffness at both ends is large, ensuring that the middle strain zone remains in a pure shear stress state after loading, thereby enhancing the stability of shear strain in the strain zone. If the spokes are formed by double holes, the hole walls of the double holes also need to be cut to make them double connected holes. A new type of spoke-type load cell formed by double holes and double connected holes