Restraining of service access to HSI crusher chamber

A restraining apparatus for a horizontal shaft crusher that comprises a crushing chamber and a service hatch for opening and closing a service entry to the crushing chamber, the restraining apparatus comprising:

• a first restraint hinged to move along a first free trajectory between a blocking state and an access state in which the first restraint respectively restrains and allows opening of the service hatch;
• and
• a second restraint hinged to move along a second free trajectory between a running state and a control state, the second restraint comprising an engagement member;
• wherein when the second restraint is in the control state, the engagement member is in a use position for restraining rotation of the horizontal shaft;
• wherein when the second restraint is in the running state, the engagement member is in an idle position for not restraining the rotation of the horizontal shaft;
• wherein the first and second restraints are collectively configured to:
• prevent moving the first restraint from the blocking state to the access state if the second restraint is in the running state;
• prevent moving the second restraint from the control state to the running state if the first restraint is in the access state;
• allow moving the first restraint from the access state to the blocking state;
• and
• allow moving the second restraint from the running state to the control state,
• wherein the second restraint has a hinge axis that is perpendicular to a hinge axis of the first restraint.

A service access restraining method for a horizontal shaft crusher that comprises a crushing chamber and a service hatch for opening and closing a service entry to the crushing chamber, the method comprising:

• supporting a first restraint for movement along a first free trajectory between a blocking state and an access state in which the first restraint respectively restrains and allows opening of the service hatch;
• and
• supporting a second restraint for movement along a second free trajectory between a running state and a control state;
• supporting movably by the second restraint an engagement member so that:
• when the second restraint is in the control state, the engagement member is in a use position for restraining rotation of the horizontal shaft;
• and
• when the second restraint is in the running state, the engagement member is in an idle position for not restraining rotation of the horizontal shaft;
• wherein the first and second restraints collectively:
• prevent moving of the first restraint along the first free trajectory from the blocking state to the access state if the second restraint is in the running state;
• prevent moving of the second restraint along the second free trajectory from the control state to the running state if the first restraint is in the access state;
• allow moving the first restraint from the access state to the blocking state;
• and
• allow moving the second restraint from the running state to the control using the first restraint to block the second free trajectory unless the first restraint is in the blocking state.