Abstract: This invention relates to a method for easy installation and removal of a screen assembly for vibratory machinery and more particularly to shake table screening. The screen assembly comprises a screen frame, a screen cloth and a screen bed, whereby no clamping components are visible on top of the screen. Each assembly section can be controlled independently and clamping force is controlled by a pneumatic regulator located near an air line connection on the side of a shaker.

Abstract: A screen retention mechanism for use with vibratory separators is disclosed. The screen retention mechanism includes a structural frame mounted to a vibratory separator into which a plurality of lightweight and flexible screen elements are inserted into multiple tows of perforated screen supports. The perforated screen supports are bonded to the structural frame and are aligned parallel to the direction in which solids are conveyed by a vibratory motion. The invention further features an improved retention mechanism whereby screen elements are conveniently and selectively restrained.

Abstract: The present invention relates to an apparatus and method for the easy installation or removal of screen elements from a shaker table without the use of tools. Pneumatic cylinders are used to move hold down bars up and down to either allow for screen elements to be installed or removed from the screen bed section assembly, or to clamp them into the screen bed section assembly of a shaker so that the screen elements will not move during shaker operations.

Abstract: A system and method allow for the installation and removal of curved screen elements from a shaker table. Pneumatic cylinders are used to move hold down bars either up to allow for screen elements to be installed or removed from the screen bed section assembly, or down to clamp screen elements into the screen bed section assembly of a shaker so that the screen elements will not move during shaker operations. Each curved screen element may have a different radius. Self-adjusting hold down bars compensate for adjacent screen elements having edges that are parallel but at different elevations. The self-adjusting hold down bars also compensate for adjacent screen elements having edges that are not parallel.

Abstract: Methods of manufacturing screen elements for use with vibratory separators are disclosed. The screen elements include a curved structural frame with perforations therein, the perforations designed to maximize both open area and process liquid throughput. At least one layer of screen cloth is attached to the curved structural frame by means of fluidized powdered epoxy resin.

Abstract: The present invention relates to an apparatus and method for the easy installation or removal of screen elements from a shaker table without the use of tools. Pneumatic cylinders are used to move hold down bars up and down to either allow for screen elements to be installed or removed from the screen bed section assembly, or to clamp them into the screen bed section assembly of a shaker so that the screen elements will not move during shaker operations.

Abstract: Methods of manufacturing screen elements for use with vibratory separators are disclosed. The screen elements include a curved structural frame with perforations therein, the perforations designed to maximize both open area and process liquid throughput. At least one layer of screen cloth is attached to the curved structural frame by means of fluidized powdered epoxy resin.

Abstract: This invention relates to a method for easy installation and removal of a screen assembly for vibratory machinery and more particularly to shake table screening. The screen assembly comprises a screen frame, a screen cloth and a screen bed, whereby no clamping components are visible on top of the screen. Each assembly section can be controlled independently and clamping force is controlled by a pneumatic regulator located near an air line connection on the side of a shaker.

Abstract: A screening system including a vibratory screen separator having a resiliently mounted frame with a low frequency vibratory drive coupled to that frame. A taut screen is rigidly mounted in the frame and a vibration transmitter assembly is resiliently mounted to the frame and fixed to the taut screen. The vibration transmitter includes a planar ring compressed against the taut screen and vibration generators. The vibration generators are air turbines with eccentric weights. The frame includes support elements extending from the cylindrical outer housing sections of the separator to a concentrically mounted support ring. Compressed air is provided to the turbines through hollow structure within the frame. Valves control exhaust from the turbines. The low frequency vibratory drive operates in a range of about 8 Hz to 30 Hz while the vibration generators provided by the air turbines operate in a range of about 275 Hz to 600 Hz.

Abstract: A screen system employs a resiliently mounted housing, a vibration generator mounted to the housing, a mounting frame fixed to the resiliently mounted housing and a support surface. This system receives a screen including a screen frame and pre-tensioned screen cloth. The frame includes an inwardly extending mounting flange accessible from below the screen when placed in the housing. Clips pivotally mounted relative to the mounting frame include a first rounded lever extending upwardly to selectively engage the inwardly extending mounting flange. Second levers extend downwardly to cooperate with actuators. The actuators include inflatable bodies with contacts which, upon inflation, force the clips to engage the inwardly extending mounting flanges. This engagement retains the screen on a resiliently mounted housing and is able to further tension the screen in place.

Abstract: A screening system including a vibratory screen separator having a resiliently mounted frame with a low frequency vibratory drive coupled to that frame. A taut screen is rigidly mounted in the frame and a vibration transmitter assembly is resiliently mounted to the frame and fixed to the taut screen. The vibration transmitter includes a planar ring compressed against the taut screen and vibration generators. The vibration generators are air turbines with eccentric weights. The frame includes support elements extending from the cylindrical outer housing sections of the separator to a concentrically mounted support ring. Compressed air is provided to the turbines through hollow structure within the frame. Valves control exhaust from the turbines. The low frequency vibratory drive operates in a range of about 8 Hz to 30 Hz while the vibration generators provided by the air turbines operate in a range of about 275 Hz to 600 Hz.

Abstract: A screen system employs a resiliently mounted housing, a vibration generator mounted to the housing, a mounting frame fixed to the resiliently mounted housing and a support surface. This system receives a screen including a screen frame and pre-tensioned screen cloth. The frame includes an inwardly extending mounting flange accessible from below the screen when placed in the housing. Clips pivotally mounted relative to the mounting frame include a first rounded lever extending upwardly to selectively engage the inwardly extending mounting flange. Second levers extend downwardly to cooperate with actuators. The actuators include inflatable bodies with contacts which, upon inflation, force the clips to engage the inwardly extending mounting flanges. This engagement retains the screen on a resiliently mounted housing and is able to further tension the screen in place.

Abstract: A screen system employs a resiliently mounted housing, a vibration generator mounted to the housing, a mounting frame fixed to the resiliently mounted housing and a support surface. This system receives a screen including a screen frame and pre-tensioned screen cloth. The frame includes an inwardly extending mounting flange accessible from below the screen when placed in the housing. Clips pivotally mounted relative to the mounting frame include a first rounded lever extending upwardly to selectively engage the inwardly extending mounting flange. Second levers extend downwardly to cooperate with actuators. The actuators include inflatable bodies with contacts which, upon inflation, force the clips to engage the inwardly extending mounting flanges. This engagement retains the screen on a resiliently mounted housing and is able to further tension the screen in place.

Abstract: A vibratory screen separator having a resiliently mounted frame with a screen mounting to receive screens for material flow thereacross. Eccentric weight systems are rotationally mounted with effective axes of eccentric force coincident. The weight systems are symmetrical about a center plane through the separator for uniform vibration thereacross. The coincident axes extend through the center of gravity. A drive is coupled with both weight systems such that the direction of rotation of the weight systems are opposite to one another in one embodiment and opposite in another.

Abstract: A vibratory screen system including a screen assembly having screen cloth on both the top and the bottom of the frame. The screen cloth on the bottom has openings larger than and up to five times the size of the openings on the upper screen cloth. A pattern of dividers divide the screen into compartments. The screens are bonded to the frame and to the pattern of dividers.

Abstract: Screen assemblies having a plurality of supports assembled with peripheral screen frames with screen cloth extending fully over the assemblies. The supports are assembled with each other and with the screen frame using dovetail mechanisms. Each support includes a cell structure having walls defining open cells. The walls have an elongate cross section to provide thickness to the structure. A thin support grid is integrally formed with the walls with the top of the support grid and the top of the walls lying in the same plane. The top of the surrounding frame also lies in this plane. The walls and the frame each have energy directors for ultrasonic bonding to the screen cloth laid over the assembly. The lower edge of the walls and of the screen frame also lie within a plane and have energy directors for receipt of a larger mesh closure screen to retain self-cleaning sliders or elements within the cells. The cells have no straight edges in plan.

Abstract: A screening system having a resiliently mounted housing with a screen extending thereacross. The housing is vibrated by a low frequency vibratory drive using eccentric weights. About the peripheral frame of the screen, a high frequency drive or drives is employed to vibrate the screen in the range of 20,000 Hz. The high frequency vibration is generated at the peripheral frame about the screen. The screen may be responsive to the high frequency vibrations in a plate-like manner or as a membrane. With the high frequency drives mounted within the housing, a structure made of a sheet extends from a mounting flange inwardly to a mounting ring supporting the screen and the high frequency drives and inwardly to a collecting system including a trough and a central dome. The center of the dome may be fixed to the screen and include a high frequency drive.

Abstract: A counterweight assembly on a vertical, rotatably mounted shaft which is adjustable. First and second eccentric weight assemblies are fixed to the shaft. One of the eccentric weight assemblies includes a support fixed to the shaft to extend laterally of the shaft. The support has a ring of slots displaced laterally of the shaft. Two eccentric weights are rotatably mounted about the shaft and have pins extending to the ring of slots.

Abstract: A system for providing a self-cleaning function to rectangular vibratory screens which may be disposed on an incline in a vibratory separating system. Pans or screens defining flow-through support surfaces span across the frame of a screen parallel and displaced from the screen cloth. Sliders are positioned on the pans which have the capability of impacting the underside of the screen cloth when the vibratory system is in motion. Dynamic mechanisms for imparting circulatory motion to the sliders include mounting rods associated with the pans or screen frame members which extend laterally across same. Tubes capable of eccentric motion about the rods are mounted thereto such that the vibratory motion of the screening mechanism induces such movement for impacting against sliders to cause slider circulation. The sides of the pans are slightly flared outwardly to engage the screen frame for proper location of the system within each screen.