ASME B30.25-2007 pdf – Scrap and Material Handlers
ASME B30.25-2007 pdf – Scrap and Material Handlers.
25-1.2.3 Backward Stability Conditions With Front Removed
With the conditions as stated in para. 25-1.2.1, but with the front removed, the following shall be acceptable backward stability conditions:
(a) For crawler handlers, the horizontal distance from the center of gravity of the entire handler, less the front, to the axis of rotation shall not exceed 90% of the horizontal distance from the axis of rotation to the backward tipping axis in the least stable position.
(b) For wheel- and rail-mounted handlers, with the longitudinal axis of the upper-structure less the front perpendicular to the longitudinal axis of the carrier, the total load on all wheels on the side of the base supporting the least load shall not be less than 5% of the total weight of the handler.
SECTION 25-1.3: SWING MECHANISM
25-1.3.1 Swing Control
The swing mechanism shall start and stop smoothly with controlled acceleration and deceleration. Use of the swing brake or reversing the control lever to achieve this criteria is acceptable if it results in the ability to smoothly control the swing motion and is the normal operating procedure recommended by the manufactu rer.
25-1.3.2 Swing Braking Means and Locking Device
(a) All handlers shall have a means capable of holding the upper structure from rotating with respect to the lower structure. This means shall be capable of being set in the holding position and remaining so without further action being required by the operator. After being applied, the device shall not be dependent upon an exhaustible energy source.
(b) Means shall be provided to prevent the rotation of the upper structure during transport. This can be accomplished by a swing lock or swing brake.
(c) If the handler is not equipped with a swing lock, the swing brake shall be applied automatically when the engine stops.
SECTION 25-1.4: HANDLER TRAVEL
25-1.4.1 Travel Mechanism
(a) On rail-mounted handlers, when the travel mechanism must be temporarily deactivated in the normal course of the handler’s use, provision shall be made to disengage the travel mechanism from the cab or outside the handler body.
(b) On crawler-mounted handlers, travel performance shall be calculated and specified according to SAE J1309.
(c) All handlers shall be equipped with a travel alarm meeting the requirements of SAE J1446.
(d) On wheel-mounted handlers, the travel and steering mechanism shall be designed to permit a controlled stop in the event of the loss of engine power.
25-1.4.2 Travel Brakes
(a) Rail-mounted handlers shall be equipped with brakes capable of bringing the handler to a stop while descending the maximum grade recommended for travel. In addition, means shall be provided to engage brakes manually. Such engagement means shall be capable of holding the handler stationary on the maximum grade recommended for travel, and shall remain engaged in the event of loss of power.
(b) Crawler-mounted handlers shall be equipped with a service brake system, a secondary brake system, and a parking brake system that meet the brake performance requirements specified in ISO 10265. The brake systems may use common components; however, in the event of a failure of any single component, the remaining brake system(s) shall provide handler stopping capability meeting the secondary brake system performance requirements specified. After being applied, the parking brake system shall not be dependent upon an exhaustible energy source.
(c) Wheel-mounted handlers shall be equipped with a service brake system, a secondary brake system, and a parking brake system and meet the brake performance requirements defined in ISO 3450. The brake systems may use common components; however, in the event of a failure of any single component other than a tire, the remaining brake system shall provide handler stopping capability meeting the secondary brake system performance requirements specified. After being applied, the parking brake system shall not be dependent upon an exhaustible energy source.
(d) Prior to being placed in service, all new or modified handlers shall be tested by the manufacturer or assembler/modifier to verify that the brake systems meet the specifications in paras. 25-1.4.2(a), (b), and (c).
SECTION 25-1.5: CONTROLS
This Section describes two lever-type operating controls for wheel-mounted, crawler-mounted, or railmounted handlers on independent tracks.
(a) Primary controls are those that affect the handler’s basic functions and are used by the handler operator while at the operator station.