KR20170101492A - Floating System of Boom in Construction Equipment - Google Patents
Floating System of Boom in Construction Equipment Download PDFInfo
- Publication number
- KR20170101492A KR20170101492A KR1020160024071A KR20160024071A KR20170101492A KR 20170101492 A KR20170101492 A KR 20170101492A KR 1020160024071 A KR1020160024071 A KR 1020160024071A KR 20160024071 A KR20160024071 A KR 20160024071A KR 20170101492 A KR20170101492 A KR 20170101492A
- Authority
- KR
- South Korea
- Prior art keywords
- boom
- pressure
- head
- valve
- floating
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
The present invention relates to a boom floating system of a construction machine.
Construction machinery generally refers to construction and civil engineering machinery, and each structure such as roads, rivers, harbors, railways, and plants has a structure and performance suited to its characteristics. In other words, the construction equipment can be divided into excavation equipment, loading equipment, conveying equipment, loading equipment, compaction equipment, foundation equipment and the like due to the variety of work done in the industrial field. Specifically, the construction equipment can be classified into bulldozer, excavator, , Rollers, and the like.
The most basic work performed in the industrial field is digging. In the case of industrial construction, excavation works are mostly carried out by excavating the ground to a certain depth and installing various structures or laying pipes on the ground.
An excavator is a construction machine that performs excavation work for digging the ground in civil engineering, construction, construction site, loading work for carrying earthworks, crushing work for dismantling the building, stop work for arranging the ground (or flattening work) And an upper revolving body and a working device which are mounted on the traveling body and rotate 360 degrees.
The excavator is divided into an infinite track crawler excavator and a tire type wheel excavator according to the driving method of the traveling body. Crawler excavator is more widely used in each work site from 1 ton to more than 100 tons of equipment because it is stable and work productivity compared to wheel excavator. Wheel excavator is compared with crawler excavator It is used mainly in the work site where the work stability can be reduced but the road can be traveled and the work place can be moved without a trailer and frequently work and movement are required.
In addition, excavators can be used with appropriate working equipment depending on the state of the earth and rock, the type of work and the application. Buckets for general excavation and excavation, breakers for crushing hard ground, rocks, and crushers used for dismantling and crushing buildings.
The working mode of the excavator can be largely divided into a floating mode for planarization, a breaker mode for crushing or chopping, and a normal mode for other operations such as excavation, loading and turning.
In an operation using an excavator, a flattening operation of picking up the ground surface is often carried out while moving the bucket in the forward and backward directions. But at work, the operator has to control the boom, arm, and bucket every minute, so the fatigue he feels is high. To compensate for this, use the boom float function. The boom float function connects the load chamber and the head chamber of the boom cylinder to the tank to make them unloaded, and the boom moves freely according to the shape of the ground only by the operation of the arm. Therefore, it is possible to work with only the arm operation without a separate boom operation when the ground is grounded along the curved ground surface, thereby improving the operator's convenience.
However, when the force applied to the bucket by the bucket during the planarizing operation is too large, the bucket is likely to be pounded in the ground when the ground is relatively soft compared to the general ground, There are technical limitations.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a boom floating system for a construction machine that facilitates ground planarization regardless of the condition of the ground.
It is also an object of the present invention to provide a boom floating system for a construction machine capable of maintaining a load applied to the ground by a bucket constantly and holding the same, thereby achieving a more complete planarization operation.
A boom floating system of a construction machine according to an aspect of the present invention includes a main pump connected to an engine for driving a boom cylinder constituted by a head chamber and a load chamber and a main control valve for controlling the operation of the boom cylinder A boom floating system of a machine, comprising: a head valve for controlling pressure oil in the head chamber; A rod valve for controlling pressure oil in the load chamber; And a floating control device for supplying a separate pressurized oil to the head chamber in a boom floating mode so that the head chamber is maintained at a predetermined constant pressure.
Specifically, the floating control device includes: a gear pump that discharges the pressure oil so that the head chamber maintains the predetermined constant pressure; And a relief valve installed on the pressure oil line connected to the tank between the gear pump and the head valve.
Specifically, the floating control device includes: a gear pump that discharges the pressure oil so that the head chamber maintains the predetermined constant pressure; A check valve installed between the gear pump and the head valve; A first relief valve installed on a pressure line connecting between the check valve and the head valve by a tank; And a second relief valve installed on a pressure line connecting the check valve and the gear pump to the tank.
Specifically, the gear pump can be operated by receiving power from the engine.
Specifically, the head valve is a bidirectional flow port for flowing pressurized oil in both directions, a first port for bringing the floating function ON state in the boom floating mode; And a bi-directional shutoff port for blocking the flow of pressurized fluid, the second port allowing the floating function off state to be brought into the state.
Specifically, the rod valve is a bidirectional flow port for flowing pressurized oil in both directions, a first port for bringing the floating function ON state in the boom floating mode; And a check valve type port for allowing the pressurized oil to flow into the tank, the second port being a floating function off state.
The boom floating system of the construction machine according to the present invention can reduce the weight of the boom that can be received from the ground by relatively constructing the floating control device so as to apply predetermined pressure to the head chamber of the boom cylinder, It is possible to prevent the bucket from being pushed into the ground due to the weight of the boom even in the smooth ground condition, so that it is possible to smooth the ground planing operation irrespective of the condition of the ground and to secure the freedom to implement the boom floating function can do.
Further, in the boom floating system of the construction machine according to the present invention, the load applied to the ground by the bucket can be constantly maintained by using the floating control device, thereby achieving a more complete planarization operation.
1 is a side view of a construction machine operated by a boom float system of a construction machine according to an embodiment of the invention.
2 is a circuit diagram showing a boom floating system of a construction machine according to an embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a side view of a construction machine operated by a boom floating system of a construction machine according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a boom floating system of a construction machine according to an embodiment of the present invention.
Hereinafter, with reference to FIG. 1, a
As shown in FIG. 1, the
The
The
For example, when the
More specifically, among the operations using the
However, conventionally, when the force applied to the ground by the
The
The
The
Here, the pump connected to the
The traveling
2 is a circuit diagram showing a boom floating system of a construction machine according to an embodiment of the present invention.
2, the
1, and the
The
The
The
The
The
The
The
Specifically, when the
When the
The
The
Specifically, when the
The
The
This
That is, when the internal pressure of the
It goes without saying that the
The
The
The
The
The
The
This
That is, when the internal pressure of the
When the internal pressure of the
As described above, according to the present embodiment, the floating
In addition, in the present embodiment, the load applied to the ground by the
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art that various combinations and modifications may be made without departing from the scope of the present invention. Therefore, it should be understood that the technical contents related to the modifications and applications that can be easily derived from the embodiments of the present invention are included in the present invention.
100: Construction machine 110: Work machine
111: Boom 112: Boom cylinder
113: arm 114: arm cylinder
115: Bucket 116: Bucket cylinder
120: turning body 121: turning frame
123: cab 125: engine
127: Counter weight 130:
131: truck or track frame 133:
135: drive wheel 137: endless track
200: Boom floating system 201: Head side pressure roller
202: Rod side pressure line 204: Head side pressure return line
205: load side return line 206: tank
210: main pump 220: pilot pump
230: boom cylinder 231: head chamber
232: load chamber 233: safety valve
240: main control valve 250: remote control unit
260: valve for head 270: valve for rod
280: Floating control device 281: First relief valve
282: Check valve 283: Gear pump
284:
285b:
285d: Fourth pressure turret 290: Engine
Claims (6)
A head valve for controlling pressure oil in the head chamber;
A rod valve for controlling pressure oil in the load chamber; And
And a floating control device for supplying a separate pressurized oil to the head chamber to maintain the head chamber at a predetermined constant pressure in a boom floating mode.
A gear pump for discharging the pressure oil so that the head chamber maintains the preset constant pressure; And
And a relief valve installed on the pressure oil line connected to the tank between the gear pump and the head valve.
A gear pump for discharging the pressure oil so that the head chamber maintains the preset constant pressure;
A check valve installed between the gear pump and the head valve;
A first relief valve installed on a pressure line connecting between the check valve and the head valve by a tank; And
And a second relief valve installed on a pressure line connecting the check valve and the gear pump to the tank.
Wherein the boom is operated by receiving power from the engine.
A bidirectional flow port through which pressure fluid flows in both directions, the first port being in a floating function on state in the boom float mode; And
A bidirectional shut-off port for shutting off pressurized fluid, comprising a second port for bringing the floating function off state into a state.
A bidirectional flow port through which pressure fluid flows in both directions, the first port being in a floating function on state in the boom float mode; And
A check valve type port for allowing the pressurized oil to flow into the tank, and a second port for bringing the floating function into the off state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160024071A KR20170101492A (en) | 2016-02-29 | 2016-02-29 | Floating System of Boom in Construction Equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160024071A KR20170101492A (en) | 2016-02-29 | 2016-02-29 | Floating System of Boom in Construction Equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20170101492A true KR20170101492A (en) | 2017-09-06 |
Family
ID=59925263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020160024071A KR20170101492A (en) | 2016-02-29 | 2016-02-29 | Floating System of Boom in Construction Equipment |
Country Status (1)
Country | Link |
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KR (1) | KR20170101492A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115233767A (en) * | 2022-08-25 | 2022-10-25 | 徐州徐工挖掘机械有限公司 | Floating balance hydraulic system and excavator |
-
2016
- 2016-02-29 KR KR1020160024071A patent/KR20170101492A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115233767A (en) * | 2022-08-25 | 2022-10-25 | 徐州徐工挖掘机械有限公司 | Floating balance hydraulic system and excavator |
CN115233767B (en) * | 2022-08-25 | 2023-12-05 | 徐州徐工挖掘机械有限公司 | Floating balance hydraulic system and excavator |
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