Abstract: An apparatus for providing selectable multimodal vibration in a vibratory screen assembly to filter a bulk material of varying sizes. The vibratory screen assembly includes screen deck having a rigid portion and a flexible portion. The rigid portion formed by side plates, deck ends, and stability members. The flexible portion mounts within the rigid portion and includes flexible girders and support members. The support members are attached to the flexible girders and support a screen medium fixed to the rigid portion and covering the screen deck. The flexible girders include a tensioner and are held at varying tension levels to impact the vibratory frequencies of the screen deck at various locations. The vibratory screen assembly also includes a vibration-generator to provide vibration to the assembly. When vibrated, any bulk material on the screen deck experiences a range of linear and non-linear vibrational frequencies, increasing the effectiveness of filtration.

Abstract: An apparatus for use in replacing a compliant member of a vibratory screen assembly. In supporting the vibratory screen assembly, the compliant member is compressed between a screen base and a contact plate that is mounted on a screen frame of the vibratory screen assembly and potential energy is stored by the compliant member as a result of the compression. The apparatus includes an exchanging plate and connectors that hold the exchanging plate at a selectively adjustable distance away from the contact plate. The potential energy stored by the compliant member may be decreased by increasing the distance between the exchanging plate and contact plate by adjusting the connectors. The compliant member may be safely removed and exchanged by eliminating all compression in the compliant member using the exchanging plate.

Abstract: An impulse mechanism for use with a vibratory screen includes a rotatable shaft having exposed opposing ends terminating outside the vibratory screen, a stationary spindle surrounding the opposing ends of the shaft, and vibration generators located on each of the opposing ends of the shaft that generate vibrations when the shaft is rotated. Each vibration generator includes a bearing housing that rotates with the shaft, an exposed mass component mounted to the bearing housing is accessible from outside the bearing housing and rotates about the shaft to generate vibrations, and a bearing assembly located within the bearing housing transmits vibrations from the rotating mass component to the vibratory screen assembly.

Abstract: A vibratory screen assembly with improved structural bracing having a vibratory screen deck defined by pairs of side and end walls that are arranged in a rectangular configuration. Cross members are spaced along the length of the screen deck in parallel relationship with each other and extend between the side walls of the screen deck. Bracing components are mounted exclusively between adjacent pairs of cross members and increase the flexural frequency of the vibratory screen deck. Each bracing component includes a main segment configured to extend between adjacent cross members and end sections formed at each end of the main segment. The end sections are angled with respect to the main segment and are configured to mount to the cross members to brace the screen deck.