Dust sealing

1 . A cone crusher, comprising:

a crusher head comprising a support cone;

a linear actuator for vertically moving the crusher head for setting adjustment and/or tramp iron release;

the support cone comprising a lower surface that at least in part defines a downwards opening annular cavity; the cone crusher further comprising:

a seal ring that is radially movably supported by the crusher head, and that forms a lip for the annular cavity; and

a slip ring extending into the annular cavity beyond the seal ring and forming a counter-surface for the seal ring;

wherein the slip ring at least in part defines:

a pressurised gas supply channel; and

an entry channeling;

wherein the entry channelling interconnects the pressurised gas supply channel to the annular cavity for allowing a perimetrically distributed entry of pressurized gas into the annular cavity; and

wherein the pressurised gas supply channel comprises a cover configured to be attached onto a surface of the slip ring.

2 . The cone crusher of claim 1 , wherein:

the slip ring at least in part defines a pressurised gas distribution passage, wherein the pressurised gas distribution passage interconnects the pressurised gas supply channel and the entry channelling.

3 . The cone crusher of claim 2 , wherein the pressurised gas distribution passage extends more than 30 degrees around the slip ring.

4 . The cone crusher of claim 2 , wherein the pressurised gas distribution passage consists of multiple separate sections and/or multiple independent channels.

5 . The cone crusher of claim 1 , wherein:

the slip ring comprises a skirt configured to seal with a lower frame of the cone crusher; and

the pressurised gas distribution passage resides at least partially in a recessed portion of the skirt.

6 . The cone crusher of claim 5 , wherein the pressurised supply channel at least partly passes through the skirt.

7 . The cone crusher of claim 5 , wherein:

the slip ring comprises an outwards sloping flange on top of the skirt;

and the pressurised gas supply channel extends through the flange.

8 . The cone crusher of claim 7 , wherein the pressurised gas distribution passage resides at least partially in the flange.

9 . The cone crusher of claim 7 , wherein:

the slip ring comprises a neck on top of the flange; and

the entry channelling extends through the neck and at least a portion of the flange.

10 . The cone crusher of claim 2 , wherein the pressurised gas supply channel conducts pressurised gas to the pressurised gas distribution passage.

11 . The cone crusher of claim 10 , wherein the supply channel comprises a cover configured to be attached onto a surface of the slip ring.

12 . The cone crusher of claim 7 , wherein the supply channel least partly passes through the flange.

13 . An arrangement for dust blocking in a cone crusher that comprises: a crusher head comprising a support cone; a linear actuator for vertically moving the crusher head for setting adjustment and/or tramp iron release; the support cone comprising a lower surface that at least in part defines a downwards opening annular cavity; and a seal ring that is radially movably supported by the crusher head, and that forms a lip for the annular cavity; the arrangement comprising:

a slip ring configured to extend into the annular cavity beyond the seal ring and forming a counter-surface for the seal ring;

wherein the slip ring at least in part defines:

a pressurised gas supply channel; and

an entry channelling;

and wherein the entry channelling interconnects the pressurised gas supply channel to the annular cavity for allowing a perimetrically distributed entry of pressurised gas into the annular cavity; and

wherein the pressurised gas supply channel comprises a cover configured to be attached onto a surface of the slip ring.

14 . A method for blocking entry of dust into a cone crusher, comprising:

supporting a crusher head by a support cone;

vertically moving, by a linear actuator, the crusher head for setting adjustment and/or tramp iron release;

defining, at least in part by a lower surface of the support cone, a downwards opening annular cavity;

radially movably supporting, by the crusher head, a seal ring; and

forming a lip for the annular cavity by the seal ring;

using a slip ring that extends into the annular cavity beyond the seal ring as a counter-surface for the seal ring;

defining, at least in part by the slip ring:

a pressurised gas supply channel; and

an entry channelling;

and interconnecting, by the entry channelling, the pressurised gas supply channel to the annular cavity for allowing a perimetrically distributed entry of pressurised gas into the annular cavity; and

wherein the pressurised gas supply channel comprises a cover configured to be attached onto a surface of the slip ring.

15 . A method for manufacturing a cone crusher, comprising:

providing a crusher head comprising a support cone; and

providing a linear actuator for vertically moving the crusher head for setting adjustment and/or tramp iron release;

providing a downwards opening annular cavity in a lower surface of the support cone;

providing a seal ring that is radially movably supported by the crusher head, and that forms a lip for the annular cavity;

providing a slip ring extending into the annular cavity beyond the seal ring and forming a counter-surface for the seal ring;

defining, at least in part by the slip ring:

a pressurised gas supply channel; and

an entry channelling;

and interconnecting, by the entry channelling, the pressurised gas supply channel to the annular cavity for allowing a perimetrically distributed entry of pressurised gas into the annular cavity; and

wherein the pressurised gas supply channel comprises a cover configured to be attached onto a surface of the slip ring.