The motion mode of the screen box of the square swinging screen equipment

Square swing screen equipment in the width direction structure is symmetrical, so in the center of quality, the center of mass can be simplified to the vertical plane perpendicular to the screen surface. Swinging screen bearing parts for bearing the force of the screen box, need to try to retain its original structure shape, in order to truthfully reflect the actual force of the screen box, so the bearing parts can not be simplified or ignored. As the main function of the process trim is not to improve the structural strength, it can be ignored when building the finite element model.

The beam of the square swinging screen box and the spring support beam and the side plate are mainly connected with the flange through the rivets, in order to ensure the accuracy of the model in the dynamic analysis, the various parts of the model are connected together. The connection of each part of the swinging screen in the finite element model is realized through the public area, and the nodes of these public areas automatically coincide with each other to form the public node when the grid is divided. The swinging screen can be regarded as a composite structure of space plate and beam. Many swinging screens use shell element and beam element for grid division in the research, which can reduce the number of elements and nodes, and shorten the calculation time in the analysis.

However, since the element of the swinging screen beam is abstracted into a straight line in the finite element model, the contact surface between the beam and the side plate is also simplified into a point, which will lead to a sharp increase in the stress value of the contact site, resulting in inaccurate calculation results.

The motion form of the swinging screen is plane motion, according to the force of the swinging screen, the screen box should do linear vibration along the direction of the exciting force, but in the process of work, the swinging screen will be affected by many uncertain factors, resulting in three-dimensional motion of the screen box may be produced, so the finite element model must consider the lateral stiffness of the spring. Because the rubber spring and the support tube beam are connected through the hoop, so the spring unit is connected with the spring support tube beam by creating a rigid area method.