Mineral material processing plant and a method for operating a processing plant

1. A mineral material processing plant comprising a mineral material processing apparatus and a first conveyor, the first conveyor being arranged to feed the processing apparatus during operation of said processing apparatus, the first conveyor comprising a first material transport part, a second material transport part and a pivot by which the second material transport part is fixed pivotably in relation to the first material transport part,

wherein the second material transport part is movable to an operation position in which the first material transport part and the second material transport part are parallel to each other such that the transported material is arranged to be fed via a discharge end of the second material transport part to the processing apparatus;

wherein the second material transport part is movable to a service position which is in a first pivoting direction in relation to the operation position, and wherein, in the service position, a projection of the discharge end of the second material transport part is arranged to leave free a lifting center of the processing apparatus when viewed from above; and

wherein the second material transport part is movable to a transport position which is in a second pivoting direction in relation to the operation position, wherein the second pivoting direction is opposite to the first pivoting direction, and wherein, in the transport position, the discharge end of the second material transport part is close to the processing apparatus and at a transport height which does not exceed a height which is defined by the highest point of the processing apparatus and a feed hopper of the processing apparatus during operation thereof.

2. The processing plant according to claim 1 , wherein the processing apparatus is a crusher or a screen, or includes both the crusher and the screen.

3. The processing plant according to claim 1 , comprising, as a first processing apparatus a crusher and as a second processing apparatus a screen.

4. The processing plant according to claim 1 , wherein the operation position between the transport position and the service position further comprises a feeding position of the second material transport part to a second conveyor which is connected in succession to the first conveyor and arranged to feed a second processing apparatus.

5. The processing plant according to claim 1 , comprising as the processing apparatus, a crusher and further a motor module which is beside the crusher and the material feeding by the second material transport part is arranged above the motor module.

6. The processing plant according to claim 5 , wherein in the service position the projection of the discharge end of the second material transport part is arranged to leave free a lifting centre of the motor module when viewed from above.

7. The processing plant according to claim 1 , wherein the first conveyor comprises a hydraulic actuator or a pair of hydraulic actuators which is arranged to pivot the second material transport part in relation to the first material transport part.

8. The processing plant according to claim 1 , wherein the first conveyor comprises a dust cover which is formed on the first and second material transport parts and which is foldable at the pivot.

9. The processing plant according to claim 1 , wherein the first conveyor comprises a feed hopper for feeding material to the processing plant.

10. The processing plant according to claim 1 , wherein the first conveyor comprises an endless transport member which is forming a continuing transport surface over the first material transport part and the second material transport part.

11. The processing plant according to claim 1 , wherein the first conveyor comprises a first endless transport member in the first material transport part and a second endless transport member in the second material transport part, said endless transport members are forming successive transport surfaces over the first conveyor.

12. The processing plant according to claim 1 , further comprising a processing apparatus feed hopper which comprises an open pivotable side, and wherein the discharge end of the first material transport part is set in the transport position in between the sides of the feed hopper through the open pivotable side.

13. The processing plant according to claim 1 , wherein the mineral material processing plant is a movable crushing plant.

14. A method for operating a mineral material processing plant comprising the following steps: providing a mineral material processing apparatus and a first conveyor by which the processing apparatus is fed during operation of said processing apparatus, the first conveyor comprising a first material transport part, a second material transport part and a pivot by which the second material transport part is fixed pivotably in relation to the first material transport part:

pivoting the second material transport part to an operation position for a time of operation, in which operation position the first material transport part and the second material transport part are parallel to each other such that the transported material is be fed via a discharge end of the second material transport part to the processing apparatus;

pivoting the second material transport part to a service position in a first pivoting direction in relation to the operation position, wherein the projection of the discharge end of the second material transport part leaves free the lifting center of the processing apparatus when viewed from above; and

pivoting the second material transport part for the time of the transport to a transport position which is, compared to the service position, in an second opposite pivoting direction of the second material transport part in relation to the operation position wherein the discharge end of the second material transport part is close to the processing apparatus and at a transport height which does not exceed a height which is defined by the highest point of the processing apparatus and a feed hopper of the processing apparatus during operation thereof.

15. The method according to claim 14 , wherein the processing plant is operated in a crushing mode with a crusher or in a screening mode with a screen, or is operated both in crushing and screening modes.

16. The method according to claim 14 , further comprising feeding in the operation position material by the second material transport part to a second conveyor which is connected in succession to the first conveyor and by which second conveyor is fed a second processing apparatus.

17. The method according to claim 14 , further comprising pivoting the second material transport part in relation to the first material transport part by a hydraulic actuator or a pair of hydraulic actuators.

18. The method according to claim 14 , further comprising opening an open pivotable side of a feed hopper comprised by the processing apparatus, and setting in the transport position the discharge end of the first material transport part in between the sides of said feed hopper through the open pivotable side.