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一、产生超差的原因 架盘天平采用罗伯威尔结构原理制成。如图1所示,秤盘固定在带有与连杆相连接的吊架上（AA’、BB’）,其连杆的下端与拉带片（A’O’、B’O’）的两端支持点连接,使杠杆（俗称横梁）、连杆和拉带片构成一个平行四边形（矩型）,此时重物放在天平秤盘的任何位置时,杠杆总是平衡的。但在长期使用过程中,架盘天平在外力作用下,部分构件会产生相对位置的变动,构件之间的相互磨损和个别零件的弯曲变形,都会改变或破坏构件所构成的平行四边形,从而产生架盘天平1/2最大秤量秤盘四角误差的左差、右差、外差和内差（见图2a～d,
First, the reasons for the emergence of ultra-poor Scaffolding rack structure using the principle of making. As shown in FIG. 1, the weighing pan is fixed on a cradle (AA ’, BB’) with a connecting rod connected with the lower end of the connecting rod Support at both ends of the connection, so that the lever (commonly known as beams), connecting rods and pull the strip to form a parallelogram (rectangle), this time on the weighing scale weighing plate at any position, the lever is always balanced. However, during the long-term use, under the action of external force, the shelf and balance will have relative position changes. The mutual wear and tear of individual parts and the bending deformation of individual parts will change or destroy the parallelogram formed by the components, resulting in Rack pan balance weighing pan 1/2 the largest square error left, right, heterodyne and internal difference (see Figure 2a ~ d,