Abstract:
Apparatus for removing bulk material from dumps, mixed-bed installations or the like. The apparatus includes two horizontally spaced apart, parallel endless roller chains which have side bars and form substantially horizontal upper and lower courses. The chains are driven so that the lower courses move in a predetermined horizontal direction. A plurality of carrying elements are disposed between the chains, each carrying element comprises a frame secured to both chains at respective side bars thereof and a bottom secured to the lower courses to protrude from the frame substantially horizontally opposite to the predetermined horizontal direction and close to the bottom of the next adjacent carrying element. The frame and bottoms of the carrying elements define spaces which are open on both sides.
Abstract:
A hydrostatic driving gear is described comprising a primary unit rotationally driven by a driving engine and a secondary unit rotationally driving an actuator. Each unit comprises a variable displacement hydraulic engine, in particular an axial piston engine. They cooperate in an open circuit. The primary unit and secondary unit each have a displacement adjusting device and can be continuously adjusted in respect of their direction of displacement through a zero displacement center position in two directions of displacement. The displacement adjusting device of the primary unit has associated with it a pressure flow controller which holds the working pressure at a constant presettable value. The displacement adjusting device of the secondary unit has associated with it a speed of rotation detecting device, having a position sensor to detect the flow setting. The secondary unit also has associated with it a speed detecting device and an electronic controller is provided which detects the displacement setting of the secondary unit and its actual speed of rotation and compares it with a predetermined desired actual speed of rotation and adjusts the controller correspondingly. A secondary controlled hydrostatic driving gear in an open circuit is provided which makes four-quadrant operation possible.
Abstract:
In an axial piston machine of the swashplate or bent axis type having slot control and a pressure balancing passage at the inlet end of the high pressure (HP) control slot, erosion caused by the jet of the pressure balancing passage is prevented by providing at the inlet end of the HP-control slot an interference jet passage starting from the high pressure whose opening is arranged so that the directions of flow of the pressure balancing passage and the outlet of the interference jet passage intersect.
Abstract:
An adjusting arrangement for a hydraulic pump with a variable flow quantity, having an operating cylinder located in a neutral position through the intermediary of a positively-acting resetting device, the piston of which is adjustable dependent upon the actual discharge pressure and dependent upon a parameter proportional to the actual discharge flow quantity into a position corresponding to the rated discharge flow quantity with consideration being given to the limiting value for maximum power output, maximum discharge pressure, maximum discharge flow quantity and, as required, the flow direction. An electronic control arrangement receives electrical signals corresponding to the rated discharge flow quantity and the actual discharge flow quantity and the actual pressure, which processes these signals under calculation of the actual power output and the actual pressure, and generates corresponding setting signals for the adjustment of the operating cylinder.
Abstract:
A column disposed at the center of a circular track carries a first rocker, which is provided with first roller means. An outer support is movable on wheels along said truck and carries a second rocker, which is provided with second roller means. A bridge extends between said column and said outer support and has a length which exceeds the distance between said rockers and comprises an enclosure that extends virtually throughout the length of said bridge and defines therein a peripherally enclosed cavity. Said enclosure comprises a top wall formed with a slot which extends from a point near said column away from the latter and is adapted to be closed by a cover. An endless belt conveyor is arranged in said cavity and adapted to be charged through said slot with material to be loaded. Shifting means are operable to shift said bridge in its longitudinal direction.
Abstract:
A ball-jointed bearing arrangement of the piston heads in an axial piston machine within a drive flange wherein a bearing member formed of a material with good antifriction properties for receiving a piston head is seated in a recess of the drive flange whereby all bearing members are covered by a covering plate which is detachably fastened to the drive flange. The bearing member is formed of a spherically indented cup of a flat material, such as sheet metal, which is inserted into the respective recess, which recesses conform in shape, pitch circle and distribution to the piston heads, however, are constructed in conformance with the thickness of the respective spherical dished cup deeper and larger in diameter, and in which the covering plate is traversed by the piston heads and is fastened on the side of the drive flange towards the piston heads.
Abstract:
A bridge is movable transversely to its longitudinal direction. A carrier extends in the longitudinal direction and is mounted on the bridge to be movable in said longitudinal direction. An inclined pole is connected to the carrier and extends upwardly to a top end of the pole from a point of the carrier which is nearer to the mid-point than to each end point of the carrier. A plurality of lower rope holders are provided on the carrier on opposite sides of the mid-point and spaced apart in the longitudinal direction. A plurality of ropes are associated with and connected to respective ones of the lower rope holders. A plurality of vertically spaced apart upper rope holders are secured to the pole. One of the upper rope holders is disposed near the top end. Each of the upper rope holders is connected to two of the ropes which are connected to lower rope holders provided on opposite sides of the mid-point in such a manner that none of the ropes crosses another between the upper and lower rope holders. Drive devices are provided for reciprocating the carrier in the longitudinal direction.
Abstract:
An axial piston machine having a housing (1) the interior housing chamber of which includes a leakage chamber (37) and accommodates a stroke disc (3) and a rotatably mounted cylinder drum (6) having cylinders (26, 28) and pistons (29) reciprocally movable in the cylinders, the ends of which pistons projecting out of the cylinders (26, 28) bear on the stroke disc (3). In order to avoid piston seizures, while maintaining the efficiency of the axial piston machine, there is provided a cooling circuit.
Abstract:
In an axial piston pump of fixed or adjustable displacement having a two-part housing, namely a housing part accommodating the pistons and a connecting part through which the pressure passage and the suction passage extend, the suction passage having a suction opening with a larger cross-section than that of the pressure passage, the connecting part can be mounted to the housing part as desired in two positions turned substantially through 180.degree. about the center axis of the axial piston engine. This construction enables the pump to be adapted to operate with either direction of displacement with little trouble and expense.
Abstract:
A torque control device for an adjustable hydropump is described which is based on an output control device in which the output control is determined as a function of the output pressure of the hydropump and a pressure in a working pressure control line. For this purpose a torque valve is provided whose closure power is determined by a measuring spring or set of springs connected with the pump control member and pretensioned depending on the output setting. The torque valve connects the working pressure control line with the pressureless outlet depending on the pressure in the working pressure control line and the pretension of the measuring spring. The torque valve can be fixed on to the hydropump as a separate unit and the control characteristic can be changed from outside by adjustment of the measuring spring.