Slewing circle

FIELD: mechanical engineering.

SUBSTANCE: invention relates to slewing circles of cranes and other load-lifting machines. Proposed slewing circle consists of fixed and movable upper and lower races interconnected by bolts, and solids of revolution placed in between. Lower movable race is connected with gasket made of high-strength material installed from lower side of race. Said gasket can be sectional, with butts located in non-loaded zones and can be secured by bolts or glue.

EFFECT: increased durability of slewing circle.

3 dwg

 

The invention relates to a support and turning circles cranes and other lifting machines.

The known reference-turntable lifting machines, as the USSR №265001, M CL E 02 F 9/12, comprising a fixed and movable upper and lower rings and installed in raceways (treadmills) body roll. The stationary ring of the circle is attached to the rotary part of the crane, moving to the rotary part. The transfer of loads to the load occurs through the upper movable ring circle on the rolling body and the stationary ring of the circle, then to the lower movable ring of the circle, and Vice versa. The load surfaces of the rings vary depending on the position of the circle in the working area. The most loaded obtained the ring of the lower movable, which takes most of the load in the nodes of the most stringent, which are docking sites outrigger frame and lifting machines (scientific technical report Vniitransmash on the topic EK-1191 "to Develop a method of calculating support-rotating circles of construction excavators and cranes", Moscow, 1980, p.72). The strength of the bottom rings of the rolling cross-section are different: the surface of the ring under the rolling bodies termoobrabotka and has a hardness of HRC 60 units, and the bottom surface has a hardness of up to 35 units. Therefore, when the maximum load is the destruction nignog the rolling ring, starting from the bottom surface, which leads to the destruction of rotation of the circle, to decrease its durability. It is a disadvantage of the known designs support-rotating circles.

An object of the invention is to develop a design that makes it possible to increase the durability of the rotation of the circle.

The technical result is achieved due to the presence of new elements bearing slewing range and their new relationships, namely the essence of the invention lies in the fact that in the turning circle, consisting of fixed and movable upper and lower rings fastened together by bolts, and rolling elements mounted between them, the lower movable ring is connected with a strip of high-strength material that is installed with its bottom side, and the strip may be sectional with the location of the joints in the unloaded zones, be fastened with screws or adhesive.

Figure 1 shows the location of the anchor-turntable in hoisting machine; figure 2 - cross section of the turntable; figure 3 is a fragment of the cross section of the treadmill bottom of the circle.

Bearing slewing rim consists of a fixed ring 1, is attached to the frame of the machine by means of bolts 9, bolted, 8 rings top 2 and bottom 3, between which on treadmills B move body kachani the 4 attached to the surface of the lower movable ring 3 high strength gasket 5. While the rolling body can be made in the form of balls, rollers, working with toroidal-spiral surface, etc.

In the process function of the turntable load on the rotary part of the valve 6 by means of rolling bodies 4 are transmitted on treadmills B rings and the material of the rings, attached to the lower rotary ring high-strength gasket 5, then to the rotary ring and the rotary part 7. The most loaded In the lower part of the lower rotary ring is unloaded at the expense attached to it a high-strength strip 5, thereby increasing the strength of the lower rotary ring and, consequently, to increase the durability of the turntable.

Bearing slewing rim, consisting of fixed and movable upper and lower rings fastened together by bolts, and rolling elements mounted between them, characterized in that the lower movable ring is connected with a strip of high-strength material that is installed on its bottom side, and the strip may be sectional with the location of the joints in the unloaded zones, be fastened with screws or adhesive.



 

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