DD151337A1 - AUTOMATIC ADJUSTMENT OF FOCUS ON MOBILE HOISTS, CRANES AND SIMILAR EQUIPMENT - Google Patents

Abstract

The invention relates to an automatic adjustment of the center of gravity on mobile hoists, cranes and similar equipment in all industries. The aim of the invention is to achieve a torque compensation in the superstructure with the automatic load or lastmomentabhaengigen correction of the center of gravity. Thus, the application and performance of the hoist can be increased significantly at a small footprint. According to the invention, the object is achieved by switching off a predetermined distance at the sensor 9 according to the desired tolerance of the center of gravity migration, a limit switch automatically deactivates the actuated operation "lifting" and switches the adjustment drive of the movable counterweight 8 to "extension". This process continues with the "hold" button pressed until the set larger moment on the sensor 9 has reached a desired minus tolerance. At this point, switching automatically takes place again to "lifting".

Description

Title of the invention ims

Automatic adjustment of the center of gravity on mobile hoists »Cranes and similar equipment»

The automatic adjustment of the center of gravity to increase stability is possible on all mobile hoists ₉ crane systems and similar equipment ^ which pick up, transport and set down their load without jettisoning «

Uach T'GL 30 350 sheets 4 and 11 "» 15 there is a requirement that a hoist must remain stable during load unloading. _E Thus, according to the usual construction method (festeryBallst as counterweight), the possible use, especially with larger outreaches, is greatly reduced « Additional claws can increase the stance moment, but the suspension is blocked «

With the automatic load- or load torque-dependent correction of the center of gravity position is a torque compensation. In the superstructure thus achieved the possibility of use and performance of the hoist can be substantially increased with a small footprint "Hilfsaljstützen can be omitted ©

With the invention, the center of gravity of the swiveling upper part z _o Bo of a hoist is kept in a narrow Toleransbereich the ideal center of gravity and thus reached a high Standsicherhe.it

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The superstructure must be supported at three or four points above or below the slewing ring »The support points one and two (front or rear) are bearing points. The third at three point support lying in the middle of the system or »the third and fourth at four point support against one and two lying support points are formed as an elastic connection Z ₀ B ₀ springs between the lower and upper

The path of the elastic connection is used to control the moment compensation. The overload on the elastic connections three or four from the setpoint (load admission) switches off the hoist and the adjustment drive of the movable counterweight · This working cycle is repeated until Balancing the load and counter-momentum "The change of the moment by operating the jib is compensated in the same way"

_ 3

A mobile hoist according to the invention with articulated superstructure., Movable .Weight B ^ elastic support 3 equipped and corresponding, modified, automatic switching sequence, is used as follows »

1e The load tested for permissible weight is broken down without damage _o

2 _e ! Mach warning signal, the "push" control pushbutton is pressed «

3 "The elastic support relaxes when the load is absorbed

4 * If a preset distance is used, at the encoder 9 $ corresponding to the desired tolerance of the center of gravity deviation, a limit switch automatically switches off the actuated operation "lifting" and the adjustment drive of the movable counterweight 8 to "extension". _E This operation starts continue to hold down the "Lift ¹ " key until the set, larger moment on the encoder 9 has reached a desired minus tolerance «

At this point, the switch automatically returns to "Lift."

These processes are repeated until the position of the movable counterweight 8, a torque compensation is available "Thus, the Rutlast be freed up," The same process takes place when the movable boom 4 is lowered or raised, whereby a change of the load torque occurs. Within the tolerance range complied with, it can be swiveled with released load and moved at suitable track conditions ₀

The discontinuation of the load is carried out in accordance with the reverse order _β

When the movable counterweight path is exhausted, operations which increase the torque are excluded. With this embodiment according to the invention a perfect overload - torque protection is ensured at the same time «The retention of the center of gravity in a narrow tolerance ensures a high stability ,,.

The most important prerequisite is the exclusion of unwanted load shedding by non-tapping of the load »With a Peinhubwerk the expedient to torque compensation. the equilibrium position can be sensitively produced,

Claims (2)

1e Automatic adjustment of the center of gravity on mobile hoists _$ Crane systems and similar equipment there. characterized by «, that .automatically adjusts a counter torque to a changed load torque, that the position of the center of gravity of the superstructure within a predetermined tolerance range holds * 2. lach point 1, characterized in that when exhausting a predetermined distance on the encoder (9) corresponding to the desired tolerance of gravity emigration, a limit switch automatically the actuated operation "lifting" off and the adjustment of the traverser counterweight (8) on "extending" turns on, According to point 1 + 2, characterized in that the automatic correction of the center of gravity in a given tolerance range, the performance and the application possibilities are increased in a small footprint and auxiliary supports can be omitted «, For this 1 page