| 摘要 |
The disclosure is directed to a method and apparatus for determining the cumulative load stress on hoisting equipment. Generally, the apparatus according to the invention comprises a system of electronic components operable to measure and indicate the cumulative load stress handled by a particular hoisting installation. The apparatus includes a time signal generator, generating a series of constant time interval electrical signals, first electrical conductor means, selectively operable to conduct an electrical signal indicating operation of the hoisting equipment and a second electrical conductor means selectively operable to conduct an electrical signal corresponding to the value of the load being handled by the hoisting equipment. First and second circuit means are electrically associated with the time signal generator and first and second electrical conductor means. The circuit means are operated to calculate the cube of the value corresponding to the load during the time interval of each particular one of the series of constant time interval electrical signals generated by the time signal generator during the operation of the hoisting equipment. Electrical adding and storage means and electrical comparator means are electrically connected to the circuit means and are operable to determine the sum of all the cube values formulated by the circuit means and to compare the sum with a predetermined maximum value. The comparator means is arranged to actuate an indicator means when there is a predetermined relationship between the sum stored in the electrical adding and storage means and the predetermined maximum value. |
