Abstract: The two-stage soil sifting device comprises a support frame, an upper sifter, and a lower sifter. The support frame comprises a rectangular base with cross braces and four vertical uprights that support the upper sifter and the lower sifter at elevated positions. The upper sifter comprises an upper sifter frame and a first mesh having a first mesh spacing. The upper sifter is located above the lower sifter and may be pivotally inclined with respect to horizontal. The lower sifter comprises a lower sifter frame and a second mesh having a second mesh spacing. As unsifted soil placed upon the upper sifter is moved over the surface of the upper sifter some of it passed through the first mesh onto the lower sifter and then through the second mesh onto the ground, leaving debris on the first mesh and on the second mesh.

Abstract: A vibratory separator including a frame, a screen configured to connect to the frame, a first actuator coupled to the frame, and a second actuator coupled to the frame, wherein the first actuator imparts a high frequency motion to the frame, and wherein the second actuator imparts a low frequency acceleratory motion to the frame is disclosed. Also, a method for processing drilling waste including imparting a low frequency acceleratory motion to a frame of a vibratory separator and imparting a high frequency motion over the low frequency acceleratory motion is also disclosed.

Abstract: An oscillating screen comprises a screening container inside which a screening means is disposed lying on a determinate screening plane (P), coinciding or inclined with respect to a horizontal oscillation plane (X), and oscillation means to move the screening container with respect to a fixed supporting structure. The oscillation means comprises a first movement unit provided with a first rotary shaft associated with a first eccentric element cooperating with the screening container, and a second movement unit having at least a second rotary shaft provided with a second eccentric element cooperating with the screening container. A transmission means connects the first rotary shaft and the second rotary shaft with each other, so that they have the same angular velocity.

Abstract: A dynamic separator for the processing of minerals such as coal is provided. The dynamic separator includes two movable trays that are pivotally connected to each other and actuated by a specially constructed crankshaft. The positive motion of the trays makes it possible to obtain a uniform water pulse distribution, thereby preconditioning the stimulation of mineral processing. In addition, energy consumption for mineral processing is substantially reduced, structural design of the device is simplified, and the reliability thereof is significantly increased. Good technical results of mineral processing and high reliability and operability is thereby achieved.

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 method of manufacturing a large stationary, aggregate processing screening tower by fabricating weldment modules and preassembling them with aggregate processing equipment internal within the weldment modules, transporting the preassembled weldment modules to a field work site where the tower is to be erected on a foundation, aligning the modules and stacking the modules in layers and then bolting adjacent modules together. A large stationary, aggregate processing screening tower has weldment modules preassembled with aggregate processing equipment internal within the modules. The preassembled modules are stacked up on one another and secured together and can receive aggregate product at the top module and the product is processed by screening and sizing as it moves downwardly by gravity through the modules and their processing equipment for final clarification and collection of the product.

Abstract: A polymer bead recovery apparatus is provided comprising: a housing comprising a recovery tank having an internal cavity and an exterior surface, the recovery tank having at least one inlet and at least one outlet, the recovery apparatus having a least one circulation system for creating a force within the internal cavity of the recovery tank, the housing further comprising a walkway situated on the exterior surface of said recovery tank, the recovery tank comprising a shaker deck having a plurality of interchangeable screens and the walkway providing access to said screens, and wherein a mixture of solid particulate material, drilling fluids, polymer beads and drilled solids are separated by a first screen of the shaker deck and the remaining mixture of small materials, fluids and beads enters the recovery tank and are separated by the force created by the circulation system, the undesired small particulate materials are removed from the recovery tank and then separated and isolated by a second screen of the

Abstract: The invention provides a vibrator assembly (5) having a pair of vibrators (1) held in spaced apart relationship by a frame (10), screen assembly (1), having a screen (2, 3) extending between a pair of side plates (4), is securable between the vibrators (11) to the frame (10). The frame (10) transmits loadings transverse to the side plates (4) directly between the vibrators (11) to avoid undesirable stresses being absorbed by the screen assembly (1).

Abstract: An apparatus and method for sizing and separating particles of generally low-density materials includes a stand, a frame movably suspended on the stand by a plurality of suspension assemblies, and an elongated screen box mounted on the frame. The screen box receives material to be processed at an input end and includes openings at an output end for discharging processed material. The frame and screen box are disposed at an incline relative to a horizontal surface on which the stand rests, so that material travels downwardly in the screen box toward the output openings. A vibrator motor is mounted on the frame input end. The arrangement of the motor and suspensions results in imposition of a combination generally circular planar motion to the frame and screen box at the input end and a generally oblong linear reciprocating motion at the central portion and the output end of the apparatus.

Abstract: A screening machine of the type used to separate or classify mixtures of solid particles of different sizes includes a fixed base and a perforate screen deck mounted for movement relative to the base during a screening operation. Leaf springs connect the tail end of the screen deck to the fixed base so that the leaf springs support the tail end of screen deck for movement relative to the base. The leaf springs are oriented horizontally to avoid introducing vertical movement to the screen deck as it moves to and from the head and tail ends. The leaf springs are offset or deflected when the machine is at rest or in the neutral mid-point of its stroke. This arrangement advantageously utilizes the bias of the leaf springs to accelerate, assist or enhance movement of the screen deck during portions of its stroke and likewise to decelerate, hinder or retard the movement during other portions of its stroke. With an appropriate offset, an increase in the effectiveness of the screening process (i.e.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A sieving device and the operation of a sieving device are proposed. The sieving device has a supporting frame which can be made to vibrate and a vibration frame which is held so as to be able to vibrate freely in relation to said supporting frame. A simple, compact design which provides good sieving and conveying performance is achieved in that the vibration frame is spring-elastically coupled to the supporting frame by helical springs, with the main spring axes of the spring elements extending in the direction of vibration of the tension waves. Furthermore, guiding elements for movable bearing arrangement of the vibration frame on the supporting frame are provided. The sieving device is operated in particular at a vibration frequency of at least 850 vibrations per minute at an average speed of approx. 11 m/s and at an average acceleration of the vibration frame relative to the supporting frame of approx. 2.2 m/s2.

Abstract: An apparatus for feeding a granular catalyst to a destination such as a reactor at a constant feeding rate uniformly charges the catalyst material into the device. The granular catalyst is loaded into individual compartments of a hopper and is ejected at a discharge rate controlled by a gate. When a vibrator is activated, a trough is caused to vibrate in its obliquely upward direction and the granular material in the trough is smoothly conveyed toward outlets of granular material passages formed in the trough, and is introduced to reaction tubes of the reactor via sieves. Powdery waste of the granular catalyst produced by the vibration of the trough is removed by letting it fall the sieves made in the granular material passages.

Abstract: A transportable sorting machine frame formed of first and second frame sections which are hinged together is provided. The sorting machine is mounted to one frame section and an infeed conveyor is mounted to the other. A pair of elevational jacks located adjacent to the hinge assemblies are used to tilt the frame sections upward from a horizontal transport position to an elevated position wherein the sorting machine is angled up for proper operation.

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 large or square plansifter has a large number of sieve stacks with e.g. more than 20 sieve boxes. Such boxes are constructed without a supporting grating and design so as to be exchangeable in the covered state and so that they can be placed on or in the sieve frames. A free product fall-through space or discharge space is accordingly formed between the sieve screen and a flat base plate. The sieve cleaners are placed on or in the flat base plate. In a particularly preferred manner, the sieve frames are constructed as metal frames. The sieve cleaners clean the sieve screen and clear the product from the base plate. The sieve cleaners preferably have 2, 3 or 4 arms.

Abstract: In a screening machine comprising two screening frames (13 and 31) each having mutual oppositely located feed and discharge ends on which there is arranged an elastic screening lining (54) and which are caused to oscillate by independent oscillating drives wherein the two screening frames (13 and 31) are associated with each other at different heights in such a way that the lower region of the upper screening frame (31) and the upper region of the lower screening frame (13) lie in a common plane, that the elastic screening lining (54) is secured to the two screening frame (13, 31) in the common plane thereof and that the upper screening frame (31) is independently driven in a circular configuration at the feed end and the lower screening frame (13) is indepndently driven in a circular configuration at the discharge end.

Abstract: Apparatus for transferring heat between solid particles includes placing a first granular material composed of particles of a first size on the upper side of a downwardly sloping vibratory screen. The openings in the screen are sufficiently small to prevent passage therethrough of the particles of the first material. A second granular material composed of particles of a second size, smaller than the first size, is spread over the first material on the screen to mix with and sift through the first material as the screen is vibrated. The size of the particles of the second material is small enough to allow passage through the openings in the screen. The first and second materials are at different temperatures so that as the particles of the two materials mix, heat is transferred between the particles. After mixing and heat transfer, the first material flows off the lower edge of the screen where it can be gathered, and the second material flows through the screen where it likewise can be gathered.

Abstract: A universal modular screening, classifying, cleaning and sizing machine for dusty material, comprising a frame which supports a screen box by means of cables permitting the free oscillation of the box; the screen box containing spaced parallel screens and having passages for the material to enter the screen box and to discharge same at various levels, including air flow entry and outlet channels, and at the bottom of the screen box, a mechanism to produce the oscillation of the screen box; wherein the mechanism for producing oscillation of the screen box is composed of overlying counterweights which are capable of being moved relative to one another, opening and closing in the manner of a fan, releasably clamped between a holder which is driven at variable speed and a rotating hub whose support shaft is fixedly attached to the bottom of the screen box and the oscillating mechanism is located away from the center of gravity of the screen box at the head of the machine toward the material infeed, producing an o