Abstract:
A comminution machine is provided for comminuting crushable materials such as rock, masonry and reinforced concrete, or shreddable materials such as motor vehicle tyres. The machine comprises a hopper having an open top (11) tapering to a narrower discharge opening (12). The hopper has a curved anvil wall (6) and a curved and reciprocally pivotable crushing jaw (7). Movement of the crushing jaw (7) is controlled by a two-way hydraulic ram (9). The shape of the crushing jaw (7) is generally that of a spiral away from its pivotal axis in a direction from the bottom to the top of the hopper, with the result that reciprocation of the crushing jaw (7) imparts a mixture of compressive and shear forces on comminutable material in the hopper, the sheer forces increasing in proportion nearer to the discharge opening of the hopper.
Abstract:
[0076] A blade (2) for a comminution machine of the type having interleaved counter-rotating blades (2) in the case of two shafts (1) or a single set of blades in the case of a single rotating shaft includes a carrier (20) with replaceable teeth (4) and wear plates (3). Each tooth (4) has to tooth tip (121) which projects from it and terminates in a bursting point (121), a forwardly raked receding surface (137) which recedes inwardly from the base of the tooth tip (121) and a receding surface (24) on the wear plates (3A, 3B) which extends inwardly from the base of the tooth (4) to a corner (9) at which it meets a trailing surface (24) on other wear plates (3C, 3D). Shear edges (83) are provided on the teeth (4), on the receding surfaces (24) where they meet the sides (22) of the wear plates (3A, 3D) and on the trailing surfaces where they meets the sides (22) of the wear plates (3C, 3D), and additional bursting points (149) may be provided on the receding surfaces. Two teeth (4) and associated receding and trailing surfaces are provided on each blade (2). The teeth (4) and wear plates (3) are connected to the carrier (20) using fasteners (56, 163) which are not subjected to significant forces of comminution.
Abstract:
A blade for a comminution machine includes a first attack face facing in a first direction to perform comminution when the blade is rotated about an axis of rotation in a first direction. The blade also includes a second attack face facing in a second direction to perform comminution when the blade is rotated about the axis of rotation in a second direction substantially opposite to the first direction. A radial exterior of the first attack face and a radial exterior of the second attack face are connected along an arc subtending at least 30 degrees and less than 110 degrees with respect to the axis of rotation.
Abstract:
An electric discharge shock breakdown apparatus for a reinforced concrete member and a method therefor, by which a reinforced concrete member can be automatically and safely broken down without cutting open an outside thereof. The apparatus comprises a liquid sealed box (40) to be filled with a liquid (30) so that a portion being broken down and a discharge electrode (21) are immersed in the liquid (30), a ground wire (22) for connection to reinforcements (12) of a reinforced concrete member (10) having the portion being broken down, and a high voltage pulse generating device (20) for applying a high voltage pulse between the discharge electrode (21) and the reinforcements (12).
Abstract:
Low temperature waste crushing system composed of a low temperature freezing section (30) for cooling waste material below their cold shortness transition temperature by receiving supply of cold heat from a cold heat source (10) and a crushing section (34) for crushing the material cooled in the low temperature freezing section (30) by taking advantage of cold shortness, so as to enable bringing efficiency to cooling by adopting stepwise cooling and enable effective removal of heat, whereby
the cold heat source (10) is configured as a binary refrigerating cycles (11,21) combining the first refrigerating cycle of ammonia refrigerant (11) for obtaining the first cold heat higher in temperature than the cold shortness transition temperature and the second refrigerating cycle of ethane refrigerant (21) for obtaining the second cold heat lower in temperature than the cold shortness transition temperature, the low temperature freezing section (30) is configured as a dual steps cooling section (32,33), the preceding and succeeding step, each of which receives cold heat of different temperatures, and the preceding step of the dual steps cooling section (32) is supplied with the higher temperature cold heat of the first refrigerating cycle (11) and the succeeding step (33) is supplied with the lower temperature cold heat of the second refrigerating cycle (21).
Abstract:
There is provided a screen crusher (SC) capable of preventing thrown waste materials from forcibly moving upward by increasing a discharging area through which crushed waste materials are discharged to increase the disposal amount of the waste materials, and capable of catching the thrown waste materials in by crushing plates using screens. In the screen crusher (SC) having a fixed crushing plate (55) and a movable crushing plate (56) which are provided to oppose each other, and a hydraulic mechanism (57) for moving the movable crushing plate (56) to crush waste materials, the fixed crushing plate (55) and the movable crushing plate (56) are respectively formed of screens each having plural mesh openings wherein crushing teeth (67A) provided on the fixed crushing plate (55) and the movable crushing plate (56) are formed of longitudinally extended teeth, and the movable crushing plate (56) is turned about an axis (58) of rotation to move a lower end (56A) downward (R), and further having a closing shutter (59) for opening and shutting a throwing opening (54A) provided at the lower end of a hopper (54), and stopper members (65) which extend laterally and provided on the fixed crushing plate (55) and the movable crushing plate (56).
Abstract:
An apparatus for crushing reinforced concrete elements and separating the crushed concrete from the reinforcements, the apparatus comprising a crusher for crushing the reinforced concrete elements into crushed concrete and reinforcements, the crusher (3) having at least two jaws (4,5), which jaws define the outlet (7) for discharging the crushed concrete and reinforcements, and being such that the trajectory of the crushed concrete and reinforcements on discharge is at an angle to the vertical, and a chute (13) for receiving the discharged reinforcements, the chute (13) being laterally spaced apart from the outlet (7).
Abstract:
A comminution machine is provided for comminuting crushable materials such as rock, masonry and reinforced concrete, or shreddable materials such as motor vehicle tyres. The machine comprises a hopper having an open top (11) tapering to a narrower discharge opening (12). The hopper has a curved anvil wall (6) and a curved and reciprocally pivotable crushing jaw (7). Movement of the crushing jaw (7) is controlled by a two-way hydraulic ram (9). The shape of the crushing jaw (7) is generally that of a spiral away from its pivotal axis in a direction from the bottom to the top of the hopper, with the result that reciprocation of the crushing jaw (7) imparts a mixture of compressive and shear forces on comminutable material in the hopper, the sheer forces increasing in proportion nearer to the discharge opening of the hopper.