Self-locking folding hopper and a locking method thereof

1 . A folding feeder hopper for a bulk material processing apparatus comprising:

at least one side wall pivotably mounted to a support frame having a front end and a rear end, the side wall being mounted on the support frame via at least one pivot mount;

a rear wall mounted to the support frame at the rear end;

at least one support assembly of the side wall mounted on the support frame and including a first bracket housing a slide actuator and a second bracket housing a rotation actuator; and

a locking assembly including a first locking means provided at a lower surface of the side wall and a second locking means mounted at the support assembly such that the first locking means is configured to engage with the second locking means to immobilize the side wall, wherein the second locking means comprises a material which has a higher degree of elasticity a material of the first locking means, wherein the rotation actuator is configured to provide pivoting of the side wall between an unlocked transport position and an unlocked working position.

2 . The feeder hopper as claimed in claim 1 , wherein the support assembly includes a first guiding groove configured to receive a first pivot pin and a second guiding groove configured to receive a second pivot pin, the first guiding groove being parallel to the second guiding groove, wherein the first and the second pivot pins are configured to move synchronously in response to a translational actuation from the slide actuator.

3 . The feeder hopper as claimed in claim 1 , wherein the second locking means comprises an elastic member positioned between a front metal plate and a rear metal plate.

4 . The feeder hopper as claimed in claim 1 , wherein the side wall is provided with a pivot positioned axially above the first locking means.

5 . The feeder hopper as claimed in claim 1 , wherein the slide actuator is configured to provide translational movement to the side wall between a locked transport position and the unlocked transport position.

6 . The feeder hopper as claimed in claim 1 , wherein the first locking means is configured to engage with the second locking means when the slide actuator moves the side wall from the unlocked working position to a locked working position enabling the side wall to be locked in the locked working position.

7 . The feeder hopper as claimed in claim 1 , wherein the support assembly includes a first liner assembly mounted on the upper surface of the support assembly.

8 . The feeder hopper as claimed in claim 7 , wherein the first locking means is provided with a second liner assembly mounted on the lower surface of the first locking means.

9 . The feeder hopper as claimed in claim 8 , wherein the first liner assembly is configured to make a sliding contact with the second liner assembly when the slide actuator causes the side wall to move translationally between the unlocked working position and a locked working position.

10 . The feeder hopper as claimed in claim 9 , wherein a line of action of the sliding contact between the first liner assembly and the second liner assembly is parallel to a line of action of the slide actuator when it provides translational movement to the side wall between the unlocked working position and the locked working position.

11 . The feeder hopper as claimed in claim 1 , wherein the first locking means is in the form of a wedge protruding from the lower surface of the side wall.

12 . The feeder hopper as claimed in claim 8 , wherein the first and the second liner assemblies are made of a material having a friction coefficient lower than a friction coefficient of the material of the wall.

13 . The feeder hopper as claimed in claim 2 , wherein the locking assembly includes at least one retaining member mounted on the front end of the support frame and at least one retaining member mounted on the rear wall.

14 . The feeder hopper as claimed in claim 13 , wherein an engagement plane of the at least one retaining members is parallel to the first and the second guiding grooves.

15 . A method for locking at least one side wall of a feeder hopper of a bulk material processing apparatus, the method comprising the steps of:

providing the feeder hopper, the feeder hopper comprising:

at least one side wall pivotably mounted to a support frame having a front end and a rear end, the side wall being mounted on the support frame via at least one pivot mount;

a rear wall mounted to the support frame at the rear end;

at least one support assembly of the side wall mounted on the support frame and including a first bracket housing a slide actuator and a second bracket housing a rotation actuator; and

a locking assembly including a first locking means provided at a lower surface of the side wall and a second locking means mounted at the support assembly such that the first locking means is configured to engage with the second locking means to immobilize the side wall, wherein the second locking means comprises a material which has a higher degree of elasticity a material of the first locking means, wherein the rotation actuator is configured to provide pivoting of the side wall between an unlocked transport position and an unlocked working position;

a first translational movement by the slide actuator enabling the side wall to move from a locked transport position to the unlocked transport position;

a rotational movement by the rotation actuator enabling the side wall to move from the unlocked transport position to an unlocked working position; and

a second translational movement by the slide actuator enabling the side wall to move from the unlocked working position to a locked working position, wherein the locking assembly is configured to lock the side wall in the locked working position, wherein the locking assembly includes the first locking means provided at a lower portion of the side wall and the second locking means mounted at the support assembly, and wherein the first locking means mechanically engages with the second locking means when the slide actuator moves the side wall from the unlocked working position to the locked working position enabling the side wall to be locked in the locked working position.

16 . A mobile bulk material processing apparatus comprising:

a support frame;

a processing unit supported at the support frame;

tracks or wheels arranged to allow the apparatus to move over the ground;

a discharge conveyor;

a primary motor output; and

a folding feeder hopper arranged to contain material to be fed to the processing unit, the folding feeder hopper comprising:

at least one side wall pivotably mounted to a support frame having a front end and a rear end, the side wall being mounted on the support frame via at least one pivot mount;

a rear wall mounted to the support frame at the rear end;

at least one support assembly of the side wall mounted on the support frame and including a first bracket housing a slide actuator and a second bracket housing a rotation actuator; and

a locking assembly including a first locking means provided at a lower surface of the side wall and a second locking means mounted at the support assembly such that the first locking means is configured to engage with the second locking means to immobilize the side wall, wherein the second locking means comprises a material which has a higher degree of elasticity a material of the first locking means, wherein the rotation actuator is configured to provide pivoting of the side wall between an unlocked transport position and an unlocked working position.