Abstract: The present invention refers to a module (2) for assembly of a filter frame (1) for at least one filter disc (not shown) of a rotatable disc filter, which filter frame is provided for supporting at least two filter segments (not shown), which filter segments together form the outer part of said filter disc. The module (2) comprises an intermediate member (5) intended to beat least partially provided between two adjacent filter segments.

Abstract: A gyratory crusher comprises a first crushing shell mounted on a crushing head, and a second crushing shell mounted on a machine frame, a crushing gap being formed between said first and second crushing shells. A method of controlling the operation of said crusher comprises measuring a parameter being representative of the stresses to which the crusher is exposed during the crushing of material, determining an average value of said parameter, determining a deviation value of said parameter, calculating a peak value based on said average value and said deviation value, comparing said peak value to a reference value, and controlling the operation of the crusher in view of said comparison between said peak value and said reference value.

Abstract: A gyratory crusher has a crushing head on which a first crushing shell is mounted, a frame on which a second crushing shell is mounted, and a driving device, which is arranged with a rotating eccentric to cause the crushing head to execute a gyratory movement for crushing of material. The crushing head is connected to the frame of a rotation-restricting arrangement, which comprises a beater in a tank. Spinning of the crushing head is restricted by the beater being braked, during operation of the crusher, by a liquid contained in the tank.

Abstract: An inner shell has a first part of a lug-notch arrangement, which first part is arranged to co-operate with a second part of the arrangement to prevent rotation of the inner shell relative to a crushing head. The inner shell has a contact surface in its upper portion and is arranged to be pressed towards the lower portion of the crushing head by a pressing force which is obtained by tightening at least two threaded bolts, which are arranged in the upper portion of the crushing head such that their longitudinal direction is substantially parallel to the symmetry axis of the crushing head.

Abstract: A crusher has first and second crushing elements spaced apart to form a crushing gap therebetween. A measuring device is arranged to measure the instantaneous load on the crusher during at least one period to obtain a number of measured values. A calculation device is arranged to calculate a representative load value that is representative of the highest, measured instantaneous load during each such period of time. A control device is arranged to compare the representative load value with a desired value and to control the load on the crusher depending on the comparison.