SU891842A1 - Bucket-wheel excavator working member - Google Patents

Description

.I

The invention relates to earthmoving machinery, more specifically to mining rotary excavators used from open pit mining.

Known working bodies of rotary excavators, buckets which are rigidly mounted on the rotor GO.

Known working body of a rotary excavator, buckets which are rigidly fixed to the rotor. The rigid attachment of the buckets on the rotor, with its usual location not along the cutting radius, due to the constructive need for assembling the tip of the rotor boom, causes uneven wear of the angled teeth of the buckets. This is due to the fact that one of the bucket's angular teeth is located on a larger cutting radius relative to the j eHTpa rotation of the upper structure, and the second one on a smaller one. Therefore, when the lateral feed of the rotor in one direction, one tooth participates in the larger radius, and in the other case, both at once C2J.

However, depending on the position of the rotor boom in the vertical plane and the direction of the lateral feed of the rotor, the wear of the teeth, the workloads and the power consumption are different in magnitude. In addition, the working body with a rigid attachment of buckets on the rotor with horizontal oscillations

10 of the boom, a change in the width of the chip, and consequently, its area and cutting effort (circumferential and lateral), corresponding to an amplitude, occurs, which lead to an increase in the dynamic load of the working equipment.

The purpose of the invention is to increase durability and reduce dynamic loads.

Claims (2)

The goal is achieved by the fact that in a working body of a rotary excavator, including a rotor with buckets and a drive, each bucket is provided with a support frame mounted on the rotor between hinges located in the plane of the longitudinal symmetry of the rotor, while the support frame has lateral elastic elements to restrict rotation each bucket in the transverse plane. Figure 1 shows the working body, top view; Fig. 2 shows a soil cutting scheme. The working body of the excavator has a rotor 1, buckets 2, the rotor shaft 3, the drive k. Buckets are mounted on support frames 5t which, through the front and rear frames of coaxial hinge 6, located in the longitudinal plane of symmetry of the bucket and the plane of rotation of the rotor, are mounted on the rotor 1. Rotation of the bucket from the neutral position under the action of lateral cutting force is limited by side stops 7, made in the form of an elastic element, such as a spring. The elastic elements 7, prior to installation on the rotor, are pre-compressed with a slight force, under the action of which the bucket is stably maintained in a neutral position in an idle state. During the operation of the excavator under the action of lateral force, deviates from the neutral position to the side opposite to the direction of lateral feeding, while the angled tooth is from the non-working side, the bucket moves away from the nose and does not participate in cutting. When the bucket leaves the bottom, it becomes in the neutral position under the action of the elastic forces of the side stops and thus ensures good unloading of the buckets. Rotation of the bucket under the action of lateral forces allows eliminating an idle angular tooth from contact with the face, reducing its wear and energy consumption of the excavation process, and the difference in the magnitude of the working loads. 24 depending on the direction of the lateral feed of the rotor. When the rotor boom and, consequently, the rotor in the direction of lateral feeding, the bucket, with its teeth in the face and compressing the spring of the side stop, rotates relative to the rotor in the direction opposite to the direction of the oscillation, and when the rotor reverses, the spring returns the bucket initial position. This ensures minimal changes in the width of the chip, its area and cutting forces, and, consequently, reduces the dynamic loading of the working equipment. In addition, the installation of the side stops of the swiveling buckets in the form of an elastic element, such as a spring, reduces dynamic loads by damping horizontal vibrations. increase durability, and reduce dynamic loads, each bucket is equipped with a support frame mounted on the rotor by means of hinges located in the plane of the longitudinal symmetry of the rotor, while the supporting frame has kovye elastic members to limit rotation of each bucket in the transverse plane. Sources of information taken into account in the examination 1. USSR author's certificate number 293933, cl. E 02 F 3/2, 1969. 2. Authors certificate of the USSR (f 293102, CL E 02 F 3/2, 1969 (prototype.