A gyratory crusher main shaft assembly has a main shaft, an axially upper region of the main shaft including a tapered conical section with a protective sleeve friction fitted over the cone. To facilitate mounting and dismounting of the sleeve, at least one groove is indented within a radially external facing surface of the main shaft at the region of the cone to allow fluid to be introduced under pressure to the region between the sleeve and the cone.

A gyratory crusher main shaft assembly has a main shaft, an axially upper region of the main shaft including a tapered conical section with a protective sleeve friction fitted over the cone. To facilitate mounting and dismounting of the sleeve, at least one groove is indented within a radially external facing surface of the main shaft at the region of the cone to allow fluid to be introduced under pressure to the region between the sleeve and the cone.

The disclosure relates to a cone crusher, including a supporting device being arranged inside a cavity of a main shaft of the crusher. The supporting device is arranged to support a crushing head, and to be vertically displaceable for adjusting the width of a crushing gap. The supporting device has an upper portion enclosed by the crushing head, the upper portion being arranged to provide support to the crushing head. A lower portion extends downwards within the cavity of the main shaft, wherein the upper portion and the lower portion have different outer dimensions as defined transverse to the shaft axis. A pressure-active surface is formed at a transition between the upper portion and the lower portion so as to form a variable-volume compression chamber within the cavity below said pressure-active surface.

A method, crusher, computer program and crushing plant, in which bridging generated on an arm is detected in a crusher that has a body, an outer wear part fixed to the body, an outer wear part fixed to the body; a support cone rotatable inside the body via a main shaft); an inner wear part on a cone surface of the support cone; and a support of the support cone. The support contains a group of arms inside the body and extending inwards from the body; a main shaft radially supported to the arms; and a thrust bearer supported by the arms for supporting the main shaft and for axially supporting the support cone via the main shaft. The crusher crushes mineral material between the inner wear part and the outer wear part. Measurement information is received describing stress of the support of the support cone; and bridging formed onto an arm is detected from the measurement information.

A method, crusher, computer program and crushing plant, in which bridging generated on an arm is detected in a crusher that has a body, an outer wear part fixed to the body, an outer wear part fixed to the body; a support cone rotatable inside the body via a main shaft); an inner wear part on a cone surface of the support cone; and a support of the support cone. The support contains a group of arms inside the body and extending inwards from the body; a main shaft radially supported to the arms; and a thrust bearer supported by the arms for supporting the main shaft and for axially supporting the support cone via the main shaft. The crusher crushes mineral material between the inner wear part and the outer wear part. Measurement information is received describing stress of the support of the support cone; and bridging formed onto an arm is detected from the measurement information.

A rock crusher is provided that has a crusher cavity defined between a first part and a second part. A plurality of hydraulic cylinders are mounted between the first and second part, the hydraulic cylinders including a relief system. The relief system is included for reducing oil pressure within the hydraulic cylinders in the event uncrushables enter the crusher cavity, the relief system including a relief valve that is designed to open when hydraulic pressure in hydraulic cylinder reaches a predetermined level. This reduces the pressure in the hydraulic cylinder as oil pressure is dumped from the hydraulic cylinder via various oil passages.

A rock crusher is provided that has a crusher cavity defined between a first part and a second part. A plurality of hydraulic cylinders are mounted between the first and second part, the hydraulic cylinders including a relief system. The relief system is included for reducing oil pressure within the hydraulic cylinders in the event uncrushables enter the crusher cavity, the relief system including a relief valve that is designed to open when hydraulic pressure in hydraulic cylinder reaches a predetermined level. This reduces the pressure in the hydraulic cylinder as oil pressure is dumped from the hydraulic cylinder via various oil passages.

A cone crusher includes body installed on foundation with resilient dampers and having an outer cone and an inner cone. Unbalance weight is on the drive shaft of inner cone using a slide bushing, with center of gravity adjustable relative to rotation axis, slide damper of unbalance weight connected to transmission coupler, through which torque is transmitted. Transmission coupler is a disc coupler comprising a drive half-coupler, a driven half-coupler, and a floating disc between them. The driven half-coupler is rigidly connected to slide bushing, and the drive half-coupler, to gear rigidly connected to counterbalance weight. The drive half-coupler, gear and counterbalance weight are mounted on the slide bushing, and driving half-coupler, gear, counterbalance weight, and the slide bushing form one movable dynamic assembly, installed using a mounting disc, on fixed rotation axis, which rests upon flange rigidly fixed in the bottom part of body of the crusher.

A cone crusher includes body installed on foundation with resilient dampers and having an outer cone and an inner cone. Unbalance weight is on the drive shaft of inner cone using a slide bushing, with center of gravity adjustable relative to rotation axis, slide damper of unbalance weight connected to transmission coupler, through which torque is transmitted. Transmission coupler is a disc coupler comprising a drive half-coupler, a driven half-coupler, and a floating disc between them. The driven half-coupler is rigidly connected to slide bushing, and the drive half-coupler, to gear rigidly connected to counterbalance weight. The drive half-coupler, gear and counterbalance weight are mounted on the slide bushing, and driving half-coupler, gear, counterbalance weight, and the slide bushing form one movable dynamic assembly, installed using a mounting disc, on fixed rotation axis, which rests upon flange rigidly fixed in the bottom part of body of the crusher.

A pet toy for dispensing medicine, including an outer shell, an actuator assembly coupled to the outer shell, and an ingestible material initially disposed within the outer shell. Manipulation, by a pet, of the actuator assembly relative to the outer shell causes the ingestible material to exit the outer shell for ingestion by the pet.