Excavating – Ditcher – Wheel excavator
Patent
1989-06-15
1990-12-11
Reese, Randolph A.
Excavating
Ditcher
Wheel excavator
37189, E02F 508
Patent
active
049760513
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to earth moving particularly to rotary trench excavators.
Rotary trench excavators according to the present invention can be used for laying service and water pipelines, and mostly for running oil and gas trunk pipelines, especially in very hard and permafrost soils.
BACKGROUND OF THE INVENTION
Rotary trench excavators are known to find a wide application for digging long distance trenches in a range of soils.
The use of single-bucket excavators in combination with drilling and blasting operations, or the use of ladder-type trenching machines is less productive and reliable.
There are known rotary trench excavators making use of crawler-type or sometimes wheel tractor pivotably connected to the working multi-bucket member. The working member can have a single rotor, or several kinematically or rigidly interconnected rotors.
For developing a sufficiently high pull force, especially for digging trenches of substantial cross-sections in very hard soils, the tractor, and eventually the entire trenching machine, must be very heavy. The overall weight of such an excavator is normally 50% greater than that of the proposed machine.
Expansion in the range of application of rotary trench excavators and their use for digging hard and permafrost soils, along with a growth in the length of pipelines and cross-section of trenches necessitate an increase in the pull force to be developed by the tractor or prime mover consequently resulting in a greater weight of the excavator and more power required for its movement.
Therefore, the use of single-rotor trench excavators is disadvantageous, or sometimes impossible.
More advantageous for use with high power prime movers is a construction of a trench digging member consisting of several independent rotors.
A construction which bears the closest resemblance to one to be herein described resides in rotary trench excavator (SU, A, 1,113,483) which comprises a semi-trailing working member including a movable frame with a wheeled support, and rotors mounted on a carrying frame. The carrying frame is disposed between the rotors and has cantilevers with ends thereof accommodated in the interior of the rotors. Soil is dug by this excavator at two sides of the pipeline resting on the ground, whereas part of the ground under the frame is removed by a passive mechanism, whereby it is impossible to dig a full-profile trench. In addition, with two rotating rotors the working member of the excavator fails to ensure digging in a direction coinciding with the movement of the machine or counter to the movement of the machine, since the first causes a vertical component of the digging force directed upwards, and the second causes a vertical component force directed downwards, both resulting in a moment acting in the lateral plane and therefore a higher dynamic range of the working member.
This technical solution makes it possible, in the case of using an independent drive for each rotor, to provide a working member wherein adjacent rotors rotate in the opposite directions only if one more active rotor of the same dimensions is installed therebetween, which necessitates displacement of such a rotor longitudinally to result in excessive length of the working member. Also, offsetting the rotors longitudinally calls for the provision of additional means for evacuating the soil being dug.
SUMMARY OF THE INVENTION
The invention aims at providing a trench excavator having a working implement of rotary type so constructed as to ensure trench digging with minimum consumption of power of trenches of substantial cross-section especially in hard permafrost grounds, reduce loads exerted on the engine, as well as to reduce the weight and simplify assembly and servicing of the excavator.
These and other aims are attained by that in a rotary trench excavator comprising a prime mover pivotably connected to a main movable frame carrying a working member in the form of a system of drive rotors having each in its interior a support frame with guide and support
REFERENCES:
patent: 1246524 (1917-11-01), Bager
patent: 3412490 (1968-11-01), Reising
Kovalev Evgeny P.
Shpektorov Iosif N.
Shpektorov Vladimir N.
Sushkin Alexandr M.
Trubakov June V.
Olsen Arlen L.
Reese Randolph A.
Spetsialnoe Konstruktorskoe Buro "Gazstroimashina"
LandOfFree
Rotary trench excavator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotary trench excavator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary trench excavator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-382218