DE19507152A1 - Limitation of lowering movement for scoop of swivel-type excavator - Google Patents

Abstract

The lowering movement of the elevator mechanism (2) is automatically shut off shortly before the wheels (12) or other components can be touched when the scoop is turned fully to the left-hand or right-hand position. This movement is halted by the tripping of two contacts in series from recognition of the position of the elevator mechanism. The closing of both contacts causes closure of a relay supplying a current for a proportional control of the lowering movement. Alternatively the movement is controlled electrohydraulically.

Description

The invention relates to a lowering of the lifting device for a swivel shovel loader, for material transport or the like Operations.

In the case of known swiveling shovel loaders, operating errors can result cause the pivot tower when pivoting sideways and lowered lifting device causes damage to the vehicle. Known warning devices are also in this context (optical / acoustic) no reliable protection against operating errors.

The invention has for its object to a device create the swiveled with little technical effort Detects the position of the lifting device and a lowering movement switches off.

With regard to essential advantages and details of the invention will refer to the description below and the drawing referred.

The drawing shows:

Fig. 1 is a side view of a swing power shovel,

Fig. 2 is a plan view of the swing power shovel,

Fig. 3 front view of the swing power shovel,

Fig. 4 sensor on the swing arm,

Fig. 5 circuit diagram of the sensors.

In Fig. 1, Fig. 2 and Fig. 3, a generally designated 1 swivel shovel loader is illustrated in a schematic diagram, a lifting device 2 by means of one or more lifting cylinders 3 in different use positions according to the double arrow 4-4 ', and a load suspension device 5 can be moved via one or more tilting cylinders 6 into the respective use positions according to the double arrow 7-7 '.

The lifting device 2 and the load-carrying means 5 are located on a pivot tower 8 , which can be pivoted on both sides by a turntable 9 on the front end 10 in respective positions of use in accordance with the double arrow 11-11 '.

Kinematic requirements of the lifting device 2 make it inevitable that it can touch and thus damage one of the respective front wheels 12 in the pivoted state when lowering. To prevent this damage, the lowering movement is switched off when a certain swivel angle and a certain lowering height are exceeded.

In FIG. 4 and FIG. 5 shows the arrangement according to the invention illustrating the construction of switch contacts. The pivot angle is detected via a contact 14 on the slewing ring 9 of the pivot tower 8 . The contact closes when a defined angle is exceeded.

A downstream further contact 13 (advantageously implemented as a proximity contact) closes when a defined lowering height is exceeded. By closing both contacts 13 + 14 lying in series, the relay 15 is switched so that the power supply for the proportional control 16 interrupts the lowering movement.

In a further advantageous embodiment, at piloted versions of the oil flow lowering through a electrically operated hydraulic valve interrupted and the rest This prevents lowering.

Claims (2)

1. Lowering limit for a swivel bucket loader, characterized in that in the left or right swiveled state of the lifting device ( 2 ) the lowering movement of the lifting device ( 2 ) is briefly automatically switched off by touching the wheels ( 12 ) or other attachments. 2. Device according to claim 1, characterized in that by detecting the position of the lifting device ( 2 ) two series-connected contacts ( 13 , 14 ) trigger the shutdown of the lowering movement.