Bearing slewing rim

 

(57) Abstract:

Usage: the invention relates to the mechanisms of rotation of the platforms digging and lifting machines, and more particularly to a support and turning circles. The purpose of the invention: prevention point of contact between elements of the support - turntable (DIC) due to the redistribution of load occurs, the longitudinal - transverse deformations of the rail wheels. This is achieved by the PCR, including the top 1 and bottom 2 of the rail wheels with the support surface, the main liners 3 and 4, is provided with an additional liners 5 with two concave cylindrical surfaces 6 and 7, the symmetry axis which are mutually perpendicular and are located in parallel planes. Additional liners 5 are interoperable with their cylindrical surfaces 6 and 7 with liners 3 and 4, which ensures the preservation of a constant contact area regardless of the type of deformation of the rail wheels. Liners on one of the rails community, for example 1, fixed radially. The inserts 4 are provided stops to prevent slipping with additional inserts 5. Liners 3 and 4 and additional liners 5 are from the floor the e on the DIC when the occurrence of longitudinal and transverse strains in two mutually perpendicular planes, from the action of forces in various operations of the operating cycle of the machine. 3 Il.

The invention relates to the mechanisms of rotation of the platforms digging and lifting machines, and more particularly to a support and turning circles.

Known bearing slewing rim (PCR), including Central axle, skating circles and located between rollers, made in the form of the hub, forming with the non-rotating axle, a pair of slip, and the rim and hub with the rim are connected by an elastic coupling [1].

The lack of known design is the appearance of longitudinal-transverse deformations of the rim when the perception of stress and the appearance point of contact between elements of the defence industry.

The closest known designs is the PCR, including upper and lower rail circles with support surfaces and liners, interacting with each other [2].

The disadvantage of this device is the appearance point of contact between elements of the PCR when the longitudinal-transverse deformations of the rail wheels.

The purpose of the invention is the prevention point of contact between elements of the PCR due to the redistribution nagruzki, including upper and lower rail circles with support surfaces and liners, fitted with additional inserts with two concave cylindrical bearing surfaces, the axes of symmetry which are perpendicular to each other and are in parallel planes. Additional liners are installed with the possibility of interaction with inserts, and the inserts on one of the rail circles fixed radially.

The proposed PCR complies with the requirement of "inventive step", because in the known constructions of the inventive features, aimed at the achievement of the technical result is not revealed.

The essence of the invention lies in the fact that extra inserts between the upper and lower rail circles made with a cylindrical support surfaces for interaction with inserts ensures a constant contact area regardless of the type of deformation of the rail wheels. Perform additional inserts with cylindrical support surfaces, the axes of symmetry which are perpendicular to each other, and fastening inserts on one of the rail circles radially help to redistribute the loads acting nah, from the action of forces in various operations of the operating cycle of the machine.

The proposed design allows you to create a plan that between the contacting surfaces of the elements of the PCR, an additional degree of freedom. Ensuring constant area of contact between elements of the PCR results in the prevention of point contact and uniform pressure at the contact areas.

In Fig. 1 shows the design of the PCR; Fig. 2 - transverse strain; Fig. 3 - longitudinal strain.

Bearing slewing rim includes an upper 1 and lower 2 rail wheels with the support surface, the main liners 3 and 4, additional liners 5 installed between the upper 1 and lower 2 rail circles having a concave cylindrical surface 6 and 7. Liners 3 and 4 are interoperable with cylindrical surfaces 6 and 7 additional liners 5 and inserts on one of the rails community, such as liners 3 top rail circle 1 fixed radially. Liners and additional liners are either made of polymeric material or metal with a polymer coating. The inserts 4 are provided stops to prevent descalza the ing part, therefore, it is industrially applicable.

The device operates as follows.

During operation of the excavator on the PCR act load, causing deformation of both the upper and lower rail circles. These loads are divided into active - from the forces of gravity of the boom and bucket with soil from inertial forces, as well as from efforts in pulling and lifting ropes, and weight - gravity mechanisms and sites of metal, having a constant value. In addition, the deformation of the sections of the base frame, and therefore, the lower rail circle are greatly affected by its bearing on the ground.

The level of contact stresses depends on the contact area defined by the shape of the contacting bodies, and the load level on the contact connection. Digging excavator in the rotary platform, and therefore, the upper rail round 1 from the active forces and permanent weight loads occur longitudinal strain, and when the rotation of the bucket to discharge the base frame and, consequently, the lower rail round 2 encounter transverse deformation, since the support frame installed on uneven bottom, copy these irregularities. These deformations are the fact is rotating turntable relative to the reference frame of the excavator, between which is bearing slewing rim. The rotary platform is based through the top rail circle 1 with inserts 3, additional liners 5, which take the load from the turntable and transfer them to the lower rail circle 2, which are the inserts 4, the base frame of the excavator. Deformations are compensated by additional inserts 5, having two concave cylindrical surfaces 6 and 7, which are located in parallel planes and interact with liners 3 and 4 rail circles 1 and 2. Inserts one rail of a circle, for example 1, and are mounted thereon radially. When turning the turntable inserts 3 top rail circle, interacting with the cylindrical surface 6 additional inserts 5, move them together with the upper rail round 1. Additional liners 5 at the same time their cylindrical surfaces 7 are in interaction with inserts 4, which slide on the lower rail circle 2 with the rotation of the excavator.

This device provides a constant contact area on the mating cylindrical surfaces of the liners and more the redistribution of loads, existing rail circles in the emergence of spatial deformations of the base frame and turntable.

The advantage of the proposed design is that this device improves the reliability function of the turntable and the machine in General because it allows you to compensate for all kinds of deformations that occur on the upper and lower rail circles. Improves machine productivity by reducing downtime repairs associated with the failure of the PCR.

Compared with the prototype [2] this design improves the performance of the excavator-dragline 1.1-1.2 times.

Bearing SLEWING rim, including upper and lower rail circles with support surfaces and liners, characterized in that it is provided with extra liners made with two concave cylindrical bearing surfaces, the axes of symmetry which are perpendicular to each other and are in parallel planes, with additional liners are installed with the possibility of interaction with the main liners that on one of the rail circles fixed radially.

 

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