3. Accomplishment Means

     Based on the foregoing development objectives, the selling points and accomplishment means of BR580JG were set as follows.

Safety and maintainability New crusher with upgraded functions is equipped.Operation sites, ambient environments, fed raw materials and other factors are persifying for mobile crushers operating in the field.

For this reason, the following two works have been necessitated, increasing the man-hours for conventional machines.

     i) Work to adjust crusher outlet clearance

     Before starting crushing work, the clearance of the crusher outlet needs to be adjusted to a suitable size according to the grain size after crushing.

      On the other hand, the tooth plate is worn as more work is performed and the outlet clearance as mentioned above be-comes larger than the initially adjusted size, requiring re-adjustment.

BR550JG required adjustment work by the following procedures.

(1) A gauge for measurement of the outlet clearance is inserted into the

 crushing  chamber from above the crusher to measure the outlet clearance A-1 at present and to determine any difference with the target clearance.

(2) The cylinder is operated to slide the toggle block and to open the space to mount and dismount the clearance adjustment plate.

      If a metal lump or a similar material is mixed in raw materials and fed to the crusher by error, such material is tenaciously jammed in the crusher teeth and the crusher stops its operation suddenly.

      In this case, the crusher components may get damaged. In the conventional machines, the toggle plate would buckle to prevent crusher from being damaged, especially on main bearing and frame.

      If this happens, the inside of the crushing chamber of the crusher will be filled with fed materials and will be blocked. This filled material must first be removed to resume crusher operation and this tenaciously jammed metal lump is removed by melting and cutting it. Then the buckled toggle plate must be changed with a new one. A long time (about one day) is required and tough work is required to fully restore operation.

      To solve these two problems, the structure of the equipped crusher was greatly reviewed to upgrade the ease of maintenance and restoration work, as well as safety.

      Easy adjustment of outlet clearance (Automatic adjustment mechanism)

The structure of the equipped crusher is shown . The upper side of the swing jaw is supported by the main

shaft (eccentric shaft) and the lower side, by the toggle plate. A rotary link and special lock cylinder are adopted as members to support the toggle plate. By operating the cylinder through the monitor panel, adjustment of tooth tip clearances can be made.

      A function has been added by installing a potentsensor inside the crusher to detect the rotating angle of the link mentioned above as a value of the outlet clearance, to calculate the sensor output signal and on the monitor panel.

      Because of this function, frequent maintenance work such as mounting and dismounting the clearance adjustment shims

became unnecessary, allowing automatic clearance adjustment by directly inputting clearance values as targets onto the monitor panel.

      In the clearance adjustment process, the movable teeth are pushed onto fixed teeth to reduce the clearance to 0mm, to make a 0-point correction in the system.

      This function corrects deviations in displayed values caused by wear of teeth plate.

      Thus, the work to measure tooth tip clearances that was necessary with conventional machines has become unnecessary.