SU1745820A1 - Working tool of wheel-type trenching machine - Google Patents

Abstract

Use: development of narrow trenches in the construction of pipelines. The essence of the invention: the screw of the transporting mechanism is located above the rotor at an angle to the latter with the possibility of alternately placing half the pitch of the screw surface of the screw in the cavity of the rotor buckets. Each of the buckets is made in the form of a sector of a circular ring. The mechanical connection of the rotor drives and the screw is made with a gear ratio that is a multiple of the number of rotor buckets. The angle of installation of the screw above the rotor is determined by a given ratio. A round of auger without impact enters the cavity of the buckets and moves the soil along the surface of the bucket to the subsequent turns of the auger, and then into the dump. This provides an increase in the productivity of the working body and expands the field of application in sticky and durable soils. 1 hp f-ly, 4 ill. Yo

Description

The invention relates to the field of excavation of soil and earth-moving machinery, more precisely to the working bodies of rotary excavators, and can be used in sticky and durable, frozen and ever-frozen soils during the construction of pipelines.

A working body of a rotor excavator is known, which includes a frame on which a driving rotor with buckets is mounted, an axle cleaner having working elements, and a conveyor located in the rotor cavity. The working elements of the cleaner are connected to the axle by means of brackets and hingedly connected with them, adjustable in length t. The gear ratio of the drives of the cleaner and the rotor is equal to the ratio of the number of rotor buckets to the number of workers.

elements of the cleaner, which is installed on the axis with the possibility of rotation with the rotor, and its working elements are made in the form of metal brushes.

A working body of a rotor excavator is known, comprising a frame on which a driving rotor with buckets is mounted and a transport mechanism in the form of an auger, the drive of which has a mechanical connection with a rotor drive.

The use of a known working tool in sticky and durable soils is inefficient, since in a known working body the gravitational unloading of the rotor buckets under the weight of the soil itself is carried out. Soil sticks and freezes on buckets that do not have a cleaner, and clogs them.

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This does not allow an increase in the rotational speed of the rotor and sharply reduces the productivity of the working member. In addition, the installation of a transport mechanism inside the rotor reduces the digging depth of the working body, which also limits its use in sticky and durable soils.

The purpose of the invention is to increase productivity and expand the field of application in sticky and durable soils.

The goal is achieved by the fact that in a working body of a rotary excavator, including a frame on which drive rotors with buckets are installed and a screw-like transport mechanism, the drive of which has a mechanical connection with the rotor drive, the auger is located above the rotor at an angle to the latter with the possibility of alternating placing half the pitch of the screw surface of the screw in the cavity of the rotor buckets, each of the buckets made in the form of a sector of a circular ring, and the mechanical connection of the rotor drives and the screw is made with ratio, a multiple of the rotor buckets.

The goal is achieved by the fact that the angle of the screw is determined from the relation:

a - arctg

2 Air T (Up Dp

-one.

where fUp is the rotor speed, s

sgr - rotation frequency of the transport mechanism,

t is the pitch of the screw blade of the transporting mechanism, m;

Dp is the diameter of the rotor with buckets, m; Fig. 1 shows a working body, a longitudinal section; figure 2 is the same cross section; Fig. 3 shows the layout of the axes; figure 4 is a graph of speeds.

The working body of a rotary excavator includes a frame 1, on which a driving rotor 2 with cleaned buckets 3 and a transporting mechanism 4 with a drive are mounted.

The transporting mechanism 4 is made in the form of a screw and is mounted above the rotor 2 on the shaft 5 so that half the pitch of the screw surface of the screw can be freely and alternately placed in the cavity of the buckets 3 of the rotor 2. The buckets 3 are made in the form of a circular ring sector: without side walls and with a cylindrical inner surface, the Rotor 2 has a shaft 6 mounted on the frame 1. From the same shaft

6, the transport mechanism 4 is transmitted through a gear system. The gear ratio between the rotor 2 and the transport mechanism A is a multiple of

buckets 3 of the rotor 2. If the rotor 2 has, for example, 10 buckets evenly placed around its circumference, the transport mechanism 4 in the form of an auger must make 10 turns per rotor rotation

2. The width of the bucket 3 of the rotor 2 should be less than half the pitch t of the screw surface of the screw, and the height of the bucket 3 should be less than the radius of the screw surface on less half the shaft diameter

5 (dtp) of the transport mechanism 4. For example, if the bucket 3 has a width B, then the screw pitch t must be t 2B. If the bucket height is 3 (h), then the diameter of the transport mechanism 4 should be DTp 2b + dip. Shaft

5 transporting mechanism 4 must be located at an angle and to the axis of the rotor. The angle "is determined from the ratio

25

and arctg

2 w t (Up Dp

0

-one.

where (Dp is the rotor speed, s;

  rotation frequency of the transport mechanism, s;

t is the pitch of the screw blade of the transporting mechanism, m;

Dp is the diameter of the rotor with buckets, m. The working body is equipped with a guiding chute 7, a selection shield 8 and a support 9

5 c has a hinge 10, with respect to which the shaft 5 of the transport mechanism 4 is rotated.

The working body works as follows.

0 From the power station, the drive shaft 6 of the rotor 2 is driven, and from it (through a gearbox) the shaft 5 of the transport mechanism 4 is in the form of a screw. Since the rotation of the rotor 2 and the screw is carried out from one leading

5 of the shaft 6, and the gear ratio of the rotational speeds of the rotor 2 and the screw is fixed, then the movements of the buckets 3 of the rotor 2 and the screw turn are synchronized.

The round screw without impact enters the cavity

0 bucket 3 and moves the soil along the cylindrical surface of the bucket 3 to the subsequent turns of the screw, and then to the dump.

Since the width of the bucket 3 is less than half a turn step, then for the first half turn

5 of the screw shaft 5, the bucket 3 is in cooperation with the screw auger, and for the other half-turn it passes freely under the screw shaft 5, since its height does not exceed half the diameter of the screw auger (minus half the diameter of the shaft 5). In order to prevent seizure of the screw and bucket 3, the screw shaft 5 is mounted rotated in a plane parallel to the shaft 6 of the rotor 2 at an angle a (Fig. 3). This arrangement of the rotor 2 shaft 6 and the auger shaft 5 ensures that the bucket 3 and the auger are in motion without jamming, since the surface farthest from the axis of rotation of the screw screw moves along the bucket 3, moving away from it as the bucket 3 runs.

During the rotation of the rotor 2 and the longitudinal feed buckets 3, equipped with incisors, develop soil. The soil picked up by the buckets 3 moves down the bottom from the bottom up. At the exit from the bottom, the ground gets into the guide groove 7 and along it to the auger.

When working at shallow depths to eliminate scattering of the soil from the bucket 3 at the exit from the downhole, the guide chute should be extended to touch the ground surface of the soil.

When developing heavy soils, part of the buckets 3 of the rotor can be equipped with reinforced cutters to the detriment of the capacity of the buckets 3.

The working member allows working at high cutting speeds of the soil, i.e. The rotor speed can be increased several times due to effective forced unloading of the buckets, and consequently, productivity can be increased.

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Claims (1)

1. A rotor excavator working body comprising a frame on which a driving rotor with buckets is mounted and a screw transporting mechanism driven by a mechanical connection with a rotor driving, characterized in that in order to increase productivity and expand the field of application in sticky and strong ground, the screw is located above the rotor at an angle to the last with the possibility of alternately placing half the pitch of the screw surface of the screw in the cavity of the rotor buckets, each of the buckets made in the form of a sector of circles the thrust ring, and the mechanical connection of the rotor and auger drives is made with a gear ratio that is a multiple of the pitch of the rotor buckets. 2, the operating member according to claim 1, characterized in that the angle of screw installation is determined from the ratio a arctg   t sor Dp where a) p is the rotor speed; - auger rotation frequency; t is the pitch of the screw auger blade; Dp is the diameter of the rotor with buckets. Have /// /// /// //// /// qous. four H TAJL Vrp / er-a)