Designing Of Stage Controlling System

The stage which can go up and down is mainly used to set up the background during performance. And an elevating orchestra is the place for the band stuff to perform. With a purpose of installing high-tech equipment for newly-built theatres and on the basis of the project of the newly-built telecasting studio of Chang Chun Municipal Broadcasting and Television Centre, this paper presents a design of an automatic controlling system for stage machinery equipment, elevating stage and orchestra, which is convenient, safe and reliable.The elevating stage is made up of several elevating blocks. A controlling system can make the blocks stay at any place from 3 meters under to 2 meters over the stage with a smooth starting and stopping , and with a tolerance less than 2mm. The elevating orchestra is a platform of steel structure used for orchestra to perform. A controlling system makes the elevating orchestra move and stop at any place between the underground and the surface of the stage. This system can also automatically be level with underground and the surface of the stage. The system requires that the operation of the system be safe and safety measures are provided in the designing of its electric equipment.In this design, a PC bus industrial controlling machine and a programmable controller are adopted as the main frame of the controlling system. Two independent systems are designed for controlling the elevating stage and the orchestra respectively.And a brake motor is adopted as a towing device of the elevating equipment. The speed governing of the motor is done by stepless speed regulating, which is a energy-saving frequency converting method. Besides, interlock and overtravel-limit switch are used in the electric equipment to ensure the safe operation of the stage machinery equipment, In Window2000 operating system, the development of the whole controlling system can be accessed with "C+Builder". The program of the controlling software is accessible to the user. By means of multiwire technique, precise controlling of the stage equipment is obtained. . The system is easy to use and no hard training is needed. After thecompletion of the design, the system has been in operation for some time with desirable precision and effect.In designing the stage controlling system, brake motors are used in place of traditional hydraulic power transmission, combined with frequency conversion technique, computer controlling technique, realizing the smooth control over the elevating orchestra. On-the-spot debugging and operation show that it is desirable in effect, reliable in operation, smooth in starting and stopping, accurate in leveling with the surface of the stage, thus, fulfilling the anticipated requirements.