EE01529U1 - Rotating platform for walking excavator - Google Patents

Abstract

The disclosed rotary platform of a walking excavator has front part as a framework construction. The framework construction comprises a lower and an upper belt and a vertical steel plate mounted between these belts as longitudinal and transversal beams, and a circular beam, and additional reinforcing beams, wherein the longitudinal additional reinforcing beams are mounted substantially parallel to the longitudinal axis of the rotating platform and the transversal additional reinforcing beams are mounted perpendicularly to the transversal axis of the rotating platform.

Description

Technical field

The invention relates to a walking excavator slewing platform, more specifically, the invention relates to structural elements of the front part of a walking excavator slewing platform.

State of the art

The turntable is supported by the rollers of the support slewing device on the frame of the drive mechanism, relative to which the turntable rotates in a horizontal plane. Single-bucket excavators are essentially full-turn excavators, i.e. their turntable rotates 360 degrees. The main mechanisms and working equipment of the excavator are mounted on the turntable of this type of excavator. Therefore, the turntables of excavators must be sufficiently rigid.

A support turning device is known (SU1116130, NII TYAZHELOGO MASH, published 30.09.1984), which includes a turning platform, a support frame and a toothed belt mounted on it, a roller turning circle with rails and a central pin. The turning platform and the support frame are equipped with additional supports, which are horizontal beams connected to the vertical walls of the support frame and the turning platform. The disadvantage of this solution is that this solution can only be used during repair work on the excavator, but cannot be used during operation of the excavator.

The closest to the invention in terms of technical nature is the excavator ЭШ 19/90A No. 136 (PO Uralmash), in which the support-rotary device includes a rotary platform on which mechanisms and working equipment are mounted, and the rotary platform rests on the frame of the undercarriage. The power unit, hydraulic devices, control system, rotary mechanism, counterweight are placed on the rotary platform. Mechanical devices A, technological openings B, and a central pin C are placed on the front part of the rotary platform of the support-rotary device of the excavator ЭШ19/90A. Elements of the excavator console structure D are structurally connected to the rotary platform. The front part of the rotary platform is a truss structure, which includes a lower belt and an upper belt X1. Vertical steel plates are installed between these belts. The front part of the turntable includes four longitudinal beams M1-M4, five transverse beams L1-L5 and one circular beam Y. A support-rotation mechanism (rail slewing rings and

roller slewing ring), which in turn is mounted on a support frame. The disadvantage of this solution is that the rollers wear out during the operation of the excavator and, as a result, the slewing platform bends.

The essence of the invention

The aim of the invention is to reduce the deflection of the front part of the turntable and the wear of the rollers.

The front part of the slewing platform of the walking excavator presented comprises a truss structure. The truss structure comprises a lower belt and an upper belt and vertical steel plates installed between these belts, which are longitudinal and transverse beams, a circular beam and additional reinforcing beams, wherein the longitudinal additional reinforcing beams are substantially parallel to the longitudinal axis of the slewing platform and the transverse additional reinforcing beams are parallel to the transverse axis of the slewing platform.

The long longitudinal additional reinforcing beams are integral, zigzag shaped beams and are mirror images of each other, while the remaining additional reinforcing beams are straight beams. The installation locations of the additional reinforcing beams are determined by the locations of existing structural elements on the turntable.

List of drawings

The figure shows a schematic representation of the front part of the turntable and the elements of the cantilever structure.

Example of carrying out the invention

The front part of the slewing platform of the support-slewing device of the ЭШ19/90A walking excavator has mechanical devices A, technological openings B, a central pin C. The slewing platform is structurally connected to the excavator cantilever structure D. The front part of the slewing platform is a truss structure, which includes a lower belt and an upper belt X1. Vertical steel plates are installed between these belts. The front part of the slewing platform includes four longitudinal beams M1-M4, five transverse beams L1-L5 and one circular beam Y. The support-slewing mechanism (track slewing rings and roller slewing ring) is installed on the lower belt (not shown in the figure), which in turn is

mounted on a support frame. To increase the strength of the front part of the turntable, additional reinforcing beams M5, M6 and L6 are mounted on the front part of the turntable, wherein beams M5 and M6 are longitudinal beams, beam L6 is a transverse beam. Additional reinforcing beams M5, M6 are integral, zigzag-shaped beams consisting of parts of different lengths, which are interconnected to form an integral beam during installation on the turntable. For a better understanding of the nature of the invention, the additional reinforcing beam M5 is divided into parts a, b, c, d, e and the additional reinforcing beam M6 is divided into parts a’, b‘, c', d’, e’. The front part of the turntable, which receives the main weight of the excavator boom, is reinforced with additional reinforcing beams 1, 1', 2, 2', 3, 3', 4 and 5, with the parts of the beams 1, 2, 3 and 1', 2', 3' forming a complete beam. The installation locations of the additional reinforcing beams are determined by the locations of the existing structural elements on the turntable

and with the possibility of performing welding work. Additional reinforcing beams 1, 1', 2, 2', 4, 5 are installed between the existing beams M2 and M3 as follows: beams 1, 1' and 2, 2' are installed close to the mechanical devices A and these beams are mirror images of each other, with beams 1 and 1' being installed parallel to beams M2, M3, beams 2 and 2' being inclined from the middle of the mechanical devices A to the circular beam Y. Beams 3 and 3' are extensions of beams 2 and 2', covering the gaps between the circular beam Y and the transverse beam L1, and are connected to beams 6 and 6' of the cantilever structure D. Additional reinforcing beams 4 and 5 are installed between the additional reinforcing beams 1, 1' and 2, 2' to add rigidity to the beams 1, 1' and 2, 2'. Additional reinforcing beam 4 is installed parallel to the additional reinforcing beams 1 and 1' and beam 4 is connected to beam 7 of the cantilever structure D, additional reinforcing beam 5 is installed perpendicular to beams 1, 1' and 2, 2' and 4. Additional reinforcing beam L6 is installed under the technological openings B, parallel to the transverse axis of the turntable. Additional reinforcing beams

M5 and M6 are mirror images of each other and are substantially perpendicular to beam L6. Beams M5, M6 are installed near technological openings B. Parts of beams M5 and M6 are straight, but with different lengths and inclinations: parts a and a' are installed outside the upper

the belts X1 are perpendicular to the beam L1 and these parts a and a’ are installed up to the upper belt X1, parts b and b' are installed starting from the beam L1 and are inclined with respect to the beam L1, parts c and c' are parallel to the longitudinal axis of the turntable and are installed up to the beam L3, parts d and d’ are installed starting from the beam L3 and are inclined with respect to the beam L3 and these parts extend up to the circular beam Y. Starting from the circular beam Y, parts e and e’ are installed parallel to the longitudinal axis of the turntable and extend up to the beam L5.

During the operation of the excavator, the tension of the excavator boom, which can be up to 4500 tons/meter, is transferred through the superstructure of the column of the front cantilever structure of the excavator at point Z. If the slewing platform is not rigid enough, the slewing platform bends, as a result of which the load is unevenly distributed on the support-slewing device and causes premature wear of the support-slewing device tracks and rollers. The service life of the ЭШ19/90A excavator when removing the soil cover is approximately 2 years or 7-8 million cubic meters of moved soil. After installing additional reinforcing beams in the roller slewing ring and track slewing rings, the service life increases several times, and the speed of rotation of the fixed excavator increases by 25%. As a result, the productivity of the excavator increases by 8-10%.

List of symbols:

A -mechanical device;

B - technological opening;

C - central pin;

D- excavator cantilever structure;

X1- upper belt of the rotary platform;

L1-L5 - reinforcing beams parallel to the transverse direction of the turntable;

M1-M4- reinforcing beams parallel to the longitudinal direction of the turntable;

M5, M6 - additional reinforcing beams, which are substantially parallel to the longitudinal direction of the turntable;

L6 - additional reinforcing beam parallel to the transverse direction of the turntable;

1, 1'and 2, 2' - additional reinforcing beams;

3 and 3' - additional reinforcing beams covering the gaps between the circular beam Y and beam L1;

4, 5 - additional reinforcing beams;

6, 6', 7- beams of the cantilever structure D;

a, a', b, b', c, c’, d, d', e, e' - parts of additional reinforcing beams M5, M6.

Claims (4)

1. A swing platform for a walking excavator, wherein the front part of the swing platform comprises a truss structure comprising a lower belt and an upper belt (X1) and vertical steel plates arranged between them, which are longitudinal (M1-M4) and transverse (L1-L5) beams, and a circular beam (Y), characterized in that additional reinforcing beams (M5, M6, L6, 1, V, 2, 2', 3, 3', 4, 5) are arranged in the front part of the swing platform, wherein the additional reinforcing beams (M5, M6, 1, 1', 4) are longitudinal beams and arranged parallel to the longitudinal axis of the swing platform, the additional reinforcing beams (2 and 2') are arranged obliquely to the longitudinal axis of the swing platform, the additional reinforcing beams (L6, 5) are transverse beams and arranged parallel to the with a transverse axis, the additional reinforcing beams 3 and 3' are continuations of the additional reinforcing beams 2 and 2' and are intended to cover the gaps between the circular beam (Y) and the beam (L1). 2. A walking excavator slewing platform according to claim 1, characterized in that the additional reinforcing beams (M5, M6, 1, 1', 2, 2', 3, 3') are mounted in mirror image with respect to each other, wherein beam M5 is mirror image with beam M6, beam 1 is mirror image with beam 1', beam 2 is mirror image with beam 2', beam 3 is mirror image with beam 3'. 3. A walking excavator slewing platform according to claim 1, characterized in that the additional reinforcing beams (M5, M6) are integral beams with a zigzag shape, while the remaining additional reinforcing beams are straight beams. 4. A walking excavator turntable according to claim 1, characterized in that the locations of the additional reinforcing beams are determined by the locations of existing structural elements on the turntable.