RU2450106C1 - Working attachments of single-bucket excavator - Google Patents

Working attachments of single-bucket excavator Download PDF

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Publication number
RU2450106C1
RU2450106C1 RU2010142335/03A RU2010142335A RU2450106C1 RU 2450106 C1 RU2450106 C1 RU 2450106C1 RU 2010142335/03 A RU2010142335/03 A RU 2010142335/03A RU 2010142335 A RU2010142335 A RU 2010142335A RU 2450106 C1 RU2450106 C1 RU 2450106C1
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RU
Russia
Prior art keywords
bucket
hydraulic cylinder
handle
cavities
excavator
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RU2010142335/03A
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Russian (ru)
Inventor
Владимир Семенович Исаков (RU)
Владимир Семенович Исаков
Юрий Валерьевич Максимов (RU)
Юрий Валерьевич Максимов
Георгий Михайлович Симилейский (RU)
Георгий Михайлович Симилейский
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Государственное образовательное учреждение высшего профессионального образования "Южно-Российский государственный технический университет (Новочеркасский политехнический институт)"
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Priority to RU2010142335/03A priority Critical patent/RU2450106C1/en
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Publication of RU2450106C1 publication Critical patent/RU2450106C1/en

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Abstract

FIELD: construction.
SUBSTANCE: working attachments of single-bucket excavator includes boom, lift arm, bucket, bucket control hydraulic cylinders connected to distribution valve and rope drive. At that working attachments arte equipped with adjustable choke and two hydraulic cylinders - drafts of variable length. The first hydraulic cylinder connects bucket with lift arm while the second one connects bucket with boom, at that cavities of each cylinder connect through distribution valve both in turn and simultaneously when cavities of the first hydraulic cylinders are connected through adjustable choke.
EFFECT: increase in excavator efficiency.
2 dwg

Description

The invention relates to earthmoving equipment such as bucket-wheel shovel excavators used for the development and loading of soil.

Known cable-type excavators have a bucket fixed to the handle by means of traction of a given length (see, for example, the EO-4112 excavator at http://www.t330.ru/eo4112.him). Industrial observations of the working process of digging with such excavators with working equipment such as a backhoe have shown that the main reason for reducing its operational productivity is the loss of part of the scooped soil at the site of lifting and transferring it to the place of unloading. This is due, first of all, to the structural features of the rigid attachment of the bucket to the handle, in which the position of the bucket is determined only by two angular coordinates: the angles of rotation of the boom - φ p and the handle - φ p . This, in principle, eliminates the possibility of a rational position of the bucket in the corresponding section of the trajectory (deepening, scooping, transporting, unloading). On hydraulic excavators, this problem is solved by hinging the bucket to the handle and controlling its rotation with an additional hydraulic cylinder, i.e. the position of the bucket in this case is already determined by three coordinates - φ p , φ p and the angle of rotation of the bucket - φ k . For excavators with cable suspension, the hinged mounting of the bucket to the handle requires an additional device for controlling its rotation. At the same time, it is practically impossible to reconcile the well-known schemes of external influence on the bucket with the existing design of working equipment.

The solution to this issue is possible only due to the additional kinematic connection of the bucket with the handle and / or boom and realizing internal forces due to the relative relative position of the boom and handle. A solution is known (archive of the Design Bureau of the Donetsk Excavator Plant, Donetsk, Rostov Region), where a rigid rod pivotally connects the bucket not with a handle, but with an arrow. In this case, when the handle is rotated relative to the boom, the rigid rod tends to deploy the bucket relative to the handle. Moreover, if work is carried out by the traction rope and the handle rotates clockwise with respect to the boom, then the bucket rotates in the same direction. This allows for more intensive scooping, and when leaving the face, have a bucket position in which it is maximally filled with the developed soil.

However, this solution has a significant drawback, namely, the inability to take soil at a distance of more than half of the maximum working radius of digging. This is due to the fact that at the maximum reach, a rigid draft turns the bucket to such an extent that instead of entering the ground with teeth, it rests on it with a traction unit.

This drawback did not allow to implement this scheme in practice.

Achieving the desired result is possible by combining the main advantages of the two considered schemes, for which it is necessary to simultaneously jointly connect the bucket with two rods of variable length. One rod with a handle, and the other with an arrow, and the rod should be able to intermediate length fixation, i.e. become tough if necessary. Obviously, the operation of the excavator with such a bucket fastening scheme can occur only in two cases - if both rods can simultaneously change their length or in the case when the length of one of them (any) is rigidly fixed. With a rigid fixation of both rods, work is impossible.

As rods of variable length, hydraulic cylinders can be used. They fully satisfy the given conditions: they are able to withstand a large load, change length (stroke), smoothly and clearly lock in any position, easy to control.

It is known working equipment odnokovshovogo excavator with cable drive A.S. USSR No. 1420116, which is taken as a prototype. According to this invention, an additional rotation of the bucket is carried out by means of a turning cylinder, which through the control valve is hydraulically connected to the hydraulic cylinder of the lifting mechanism and the accumulator. However, this solution is possible only for direct shovel excavators, where scooping is carried out on the surface of the stack deviating from the excavator, which does not preclude the placement of the hydraulic cylinder of the lifting mechanism. Digging with a backhoe is impossible according to such a design scheme for two reasons:

- the lifting hydraulic cylinder prevents the introduction of the bucket into the face (i.e. makes the digging process impossible in principle);

- since the digging force significantly exceeds the scooping force, for the possible rotation of the bucket in the face, the ratio of the diameters of the turning hydraulic cylinders and the lifting mechanism is much greater than the real design capabilities.

The objective of the invention is to increase the productivity of the excavator.

The technical result is achieved by the fact that it is equipped with an adjustable throttle and two hydraulic cylinders - rods of variable length, while the first hydraulic cylinder connects the bucket to the handle, and the second connects the bucket to the boom, and the cavities of each of the hydraulic cylinders can be connected to each other through the valve, either alternately, or simultaneously connecting the cavities of the first hydraulic cylinder through an adjustable throttle.

An advantage of the invention is:

1. The proposed scheme for additional manipulation of the bucket in accordance with the conditions of each stage of the digging workflow is completely autonomous and does not require an external energy source.

2. The simplicity of the proposed solution allows it to be implemented with minimal cost both on new and in-use equipment, which will significantly increase its competitiveness with respect to hydraulic excavators.

Figure 1 shows the working equipment with two hydraulic cylinders installed (rods of variable length), one of which connects the bucket to the handle, and the other connects the bucket to the boom. Figure 2 shows the hydrokinematic diagram of the working equipment.

The working equipment of the excavator contains an arrow 1, the lower part of which is connected to the platform of the excavator 2, and the upper part with the handle 3. In turn, the lower end of the handle 3 is pivotally connected to the bucket 4, and the upper end through the hoisting rope 5 with a lifting winch (not shown). The bucket 4 by means of a traction rope 6 is connected to a traction winch (not shown), and its outer surface is connected by a hydraulic cylinder (traction of variable length) 7 to the handle 3, and by means of a hydraulic cylinder (traction of variable length) 8 with an arrow 1. Cavities of each of the hydraulic cylinders 7 and 8 are interconnected via a 3-position valve 9. In the first position of the valve 9 (designated 1GR), the cavities of the hydraulic cylinder 8 are interconnected, and the cavities of the hydraulic cylinder 7 are open. In the second position of the control valve 9 (designated - 2GR), the cavities of the hydraulic cylinders 7 and 8 are respectively connected, and the connection of the cavities of the hydraulic cylinder 7 is carried out through an adjustable throttle 10. In the third position of the control valve 9 (designated - 3GR), the cavities of the hydraulic cylinder 8 are open, and the cavities of the hydraulic cylinder 7 are connected.

Figure 1 is also indicated by a thin line 11-12-13-14-15-11 - the trajectory of the front (cutting) edge of the bucket 4, where points 11, 12, 13, 14 and 15 show the most typical digging and unloading process bucket position.

Figure 2 marked: 7P1 and 7P2 - extreme position of the piston and rod of the hydraulic cylinder 7; 8P1 and 8P2 - extreme positions of the piston and rod of the hydraulic cylinder 8; 1GR, 2GR and 3GR - operating positions of the hydrodistributor 9.

The working equipment of the excavator operates as follows.

Management of working equipment (boom 1, handle 3, bucket 4) in the positioning section of the bucket 4 on the bottom - 11-12 is carried out by a lifting rope 5, while the position of the bucket 4 relative to the handle 3 is determined by the fixed "compressed" state of the hydraulic cylinder 7 (rod and piston position - 7P1), and the hydraulic cylinder 8 is in a free "floating" position. This is ensured by the location of the valve 9 in position 1GR.

On the site of digging (digging) - 12-13, the working equipment is controlled by the traction rope 6, the bucket 4 is still fixed in its original position (the hydraulic cylinder 7 is closed in the extreme compressed position, and the hydraulic cylinder 8 is open to ensure its free movement (change of length)) .

At the moment of greatest deepening (point 13), the valve is moved to position 2GR, at which the hydraulic cylinders 7 and 8 are open and further movement of the handle 3 is accompanied by simultaneous rotation of the bucket 4 relative to the handle 3 due to the effort of the traction rope 6, and the bucket is rotated gradually over the entire scooping area 13-14. Such a smooth rotation of the bucket 4 is due to the overflow of fluid in the hydraulic cylinder 7 with a backup through an adjustable throttle 9. In this case, the hydraulic cylinder 8 is compressed, and the hydraulic cylinder 7 is stretched. The scooping process ends when reaching point 14. The position of the bucket 4 in this case corresponds to its maximum filling.

To maintain this favorable position of the bucket 4 when lifting soil from the bottom (trajectory 14-15 is provided by lifting the boom 1 with a lifting rope 5), the bucket should be moved to control the hydraulic cylinder 8 (bucket-boom connection), for which it is fixed (closed) in the extreme compressed position (position of the stem and piston 8P2) by transferring the control valve 9 to the 3GR position.

After transferring the bucket 4 to the unloading point by turning the platform of the excavator 2, the winch of the traction rope 6 is released and the bucket is unloaded in section 15-11 by turning the handle with the lifting rope 5, while the hydraulic cylinder 8 fixed in position 8P2 (position 3GR of the hydraulic distributor 9) contributes to an additional turning the bucket 4 in the direction of unloading, which is, in turn, accompanied by "compression" of the hydraulic jack 7 to position 7P1.

After unloading the bucket 4, the control valve 9 is moved to position 1GR and the duty cycle is repeated.

Claims (1)

  1. The working equipment of a single-bucket excavator, containing an arrow connected to a handle, on the bottom of which a bucket is pivotally mounted, bucket position control cylinders connected to the valve, and a rope drive, characterized in that it is equipped with an adjustable throttle and two hydraulic cylinders - variable length rods, with the first hydraulic cylinder connects the bucket to the handle, and the second connects the bucket to the boom, and the cavities of each of the hydraulic cylinders can be connected to each other through the valve cheredno, or simultaneously with the compound of the cavities of the first hydraulic cylinder through a variable throttle.
RU2010142335/03A 2010-10-15 2010-10-15 Working attachments of single-bucket excavator RU2450106C1 (en)

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Application Number Priority Date Filing Date Title
RU2010142335/03A RU2450106C1 (en) 2010-10-15 2010-10-15 Working attachments of single-bucket excavator

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Application Number Priority Date Filing Date Title
RU2010142335/03A RU2450106C1 (en) 2010-10-15 2010-10-15 Working attachments of single-bucket excavator

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RU2450106C1 true RU2450106C1 (en) 2012-05-10

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH365679A (en) * 1957-07-30 1962-11-15 Koehring Co On a basic machine arranged shovels
CH435128A (en) * 1964-10-30 1967-04-30 Schakta Ab An apparatus for deep dredging
CH450304A (en) * 1964-03-23 1968-01-15 Landsverk Ab civil engineering excavator
US3843095A (en) * 1971-12-22 1974-10-22 Bucyrus Erie Co Hydraulic crowd cable take-up system
SU599025A1 (en) * 1976-10-11 1978-03-25 Уральский завод тяжелого машиностроения им.С.Орджоникидзе Excavator bucket control device
SU619584A1 (en) * 1975-08-08 1978-08-15 Предприятие П/Я Р-6702 Excavator working equipment
SU1263759A2 (en) * 1985-04-05 1986-10-15 Белорусский Ордена Трудового Красного Знамени Научно-Исследовательский Институт Мелиорации И Водного Хозяйства Working equipment of power shovel
SU1420116A1 (en) * 1986-11-21 1988-08-30 Карагандинский политехнический институт Working equipment of rope-operating power shovel
RU2029828C1 (en) * 1990-06-11 1995-02-27 Институт проблем транспорта энергоресурсов "ИПТЭР" Power shovel for uncovering pipelines

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH365679A (en) * 1957-07-30 1962-11-15 Koehring Co On a basic machine arranged shovels
CH450304A (en) * 1964-03-23 1968-01-15 Landsverk Ab civil engineering excavator
CH435128A (en) * 1964-10-30 1967-04-30 Schakta Ab An apparatus for deep dredging
US3843095A (en) * 1971-12-22 1974-10-22 Bucyrus Erie Co Hydraulic crowd cable take-up system
SU619584A1 (en) * 1975-08-08 1978-08-15 Предприятие П/Я Р-6702 Excavator working equipment
SU599025A1 (en) * 1976-10-11 1978-03-25 Уральский завод тяжелого машиностроения им.С.Орджоникидзе Excavator bucket control device
SU1263759A2 (en) * 1985-04-05 1986-10-15 Белорусский Ордена Трудового Красного Знамени Научно-Исследовательский Институт Мелиорации И Водного Хозяйства Working equipment of power shovel
SU1420116A1 (en) * 1986-11-21 1988-08-30 Карагандинский политехнический институт Working equipment of rope-operating power shovel
RU2029828C1 (en) * 1990-06-11 1995-02-27 Институт проблем транспорта энергоресурсов "ИПТЭР" Power shovel for uncovering pipelines

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Effective date: 20121016