A two-shaft shredder includes a shredder housing, a first cutter disc unit, and a second cutter disc unit. The first cutter disc unit has at a first axial end a first bearing unit (80) with a first bearing housing and at a second axial end a second bearing unit with a second bearing housing. A first cutter disc block is rotatably mounted about a first axis of rotation. The second cutter disc unit has at a first axial end a third bearing unit with a third bearing housing and at a second axial end a fourth bearing unit with a fourth bearing housing A second cutter disc block is rotatably mounted about a second axis of rotation. The shredder housing has a first maintenance hatch cover which, in a release position, permits removal of the first cutter disc unit together with the first and second bearing units.

An ammunition disposal system having a chute access portion; a collection chamber attached such that a chute access portion interior cavity is in fluid communication with a collection chamber interior cavity; a shredder assembly attached such that the collection chamber interior cavity is in fluid communication with a shredder assembly interior cavity, with one or more shredder blade assemblies positioned within the shredder assembly interior cavity; a hopper attached such that the shredder assembly interior cavity is in fluid communication with a hopper interior cavity; an extractor attached such that the hopper interior cavity is in fluid communication with an extractor interior cavity, and wherein an auger is positioned within at least a portion of the extractor interior cavity; and a liquid contained within at least a portion of the collection chamber interior cavity, the shredder assembly interior cavity, the hopper interior cavity, and the extractor interior cavity.

A shredding module of a shredding apparatus is disclosed. The shredding module includes a shredder cassette receiver and a shredder cassette received within the shredder cassette receiver. The shredding cassette includes two shredding shafts arranged in parallel and rotatable about respective rotation axes, and two sets of fingers that cooperate with the two shredding shafts to shred material. The shredder cassette is slidably movable in an axial direction of the respective rotation axes into and out of the shredder cassette receiver.

A cutting system for a grinding pump, including a cutting disc attached to the pump near an inlet and having a cutting surface with multiple cutting orifices, and a rotating cutter attached to the rotating shaft of the pump and having two cutting blades, each blade having a cutting edge on a forward-facing side of the rotating cutter. The rotating cutter is located on the upstream side of the cutting disc, and cooperates with the cutting orifices of the cutting disc to perform cutting actions. Each cutting orifice has a hole extending from the cutting surface through the cutting disc to form a feeding orifice, and a cutting protrusion protruding from the cutting surface and surrounding the hole region. The multiple cutting orifices define recessed areas of the cutting surface between the cutting orifices. The cutting system can prevent uncut floating matters from being trapped, and is effective and safe.

A dry ice freeze-pulverizer includes pulverizing container and pulverizer main body. The pulverizing container includes a container main body that includes a bottom plate and a side plate erected from a peripheral edge of the bottom plate, has an upper surface opening, and is provided with a pulverizing blade therein, and a lid that closes the upper surface opening and has a vent hole. The pulverizer main body includes a drive device configured to rotate the pulverizing blade. The side plate of the container main body is formed with a vacuum double structure that is obtained by evacuating an internal space formed by opposing metal plates.

A cutter assembly configured for a grinder pump and including a cutter wheel and a cutter disc that interact with each other. The cutter wheel includes a shaft portion that is configured to interact with a central hole of the cutter disc, a hub portion that is connected to the shaft portion and at least two main cutting edges that in the radial direction extend outwards from the hub portion and that are configured to interact with a set of cutting holes of the cutter disc. The shaft portion includes an axially extending cutting recess. The hub portion includes only one radially extending cutting recess. The cutter disc includes a suction side, a central hole that is configured to interact with the shaft portion of the cutter wheel and a set of cutting holes that open in the suction side radially outside the central hole.

An apparatus, system and method for hydraulically adjusting and setting a fixed position of an axially displaceable shaft and rotary chipper disc combination, without requiring an attachment to or obstruction of an end face of either end of the axially displaceable shaft. A rotary chipper disc recoil mechanism is also provided for the purpose of detection of unwanted axial and radial forces placed upon the rotating shaft caused by unintentional chipping of metal, and for limiting consequential damage caused by the unintentional chipping of metal and other non-wood materials.

A cutter assembly and high volume submersible shredder pump. These are for reducing the size of solids within a liquid which is to be pumped by chopping, grinding, shredding or cutting. An improvement over prior designs employs a cutting assembly and an associated shredder pump, wherein the cutting assembly has a centrally positioned dual sided plate cutter which engages first and second rotary cutters on alternate sides of a centrally positioned dual sided plate cutter. In operation the waste water contents have a much finer grind which improves efficient removal and reduces the likelihood of shredder pump clogging. The cutter assembly is adapted for mounting to an intake opening of a stationary volute, associated with a shredder pump. As a result, many more cutting surfaces are provided which more effectively and quickly shred the solid materials within the liquid to be expelled.

The present invention relates to an apparatus (1) for pulverizing a material. The apparatus comprises a stationary housing (3) having an interior space and at least one interior wall facing the interior space. At least one sawblade (9) is disposed in the interior space and arranged rotatable with respect to the stationary housing (3). The at least one sawblade (9) has a periphery (12) provided with a plurality of cutting teeth (15) for cutting the material and a plurality of collecting notches (17) for collecting the cut material. The apparatus comprises an inlet opening (19) for feeding material to the interior space, and an outlet opening (21) for dispatching pulverized material from the interior space. The interior wall (7) of the housing is provided with a plurality of recesses (23) facing the periphery (12) of the sawblade (9), arranged to receive the cut material from the collecting notches (17) of the sawblade (9), and to revert the cut material to the periphery (12) of the sawblade (9) so that the material will be cut multiple times before it is dispatched from the apparatus. The interior wall (7) surrounds a main part of the periphery (12) of the at least one sawblade (9), and the inlet opening (19) and the outlet opening (21) are arranged in the interior wall (7) and in direct communication with the interior space (5) so that the material enters and leaves the interior space (5) during one revolution of the at least one sawblade (9).

A reversible grinder pump with cutter plate and cutter blade, wherein the cutter plate is attached to an inlet of the reversible grinder pump and is located adjacent to the cutter blade, wherein the cutter plate includes pairs of angled openings, wherein each of the pair of angled openings extends through the cutter plate and has a shape which is a mirror image of the other angled opening of the pair of angled openings, when viewed from above a surface of the cutter plate. The cutter blade of the reversible grinder pump contains a pair of triangular cross section, prism-shaped cutting edges, which are congruent to each other and reflective, extending in opposite directions from each other.