KR20130074858A - Construction machinery with cylinder apparatus employing mr damper - Google Patents

Construction machinery with cylinder apparatus employing mr damper Download PDF

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Publication number
KR20130074858A
KR20130074858A KR1020110142920A KR20110142920A KR20130074858A KR 20130074858 A KR20130074858 A KR 20130074858A KR 1020110142920 A KR1020110142920 A KR 1020110142920A KR 20110142920 A KR20110142920 A KR 20110142920A KR 20130074858 A KR20130074858 A KR 20130074858A
Authority
KR
South Korea
Prior art keywords
cylinder
fluid
piston rod
damper
construction machine
Prior art date
Application number
KR1020110142920A
Other languages
Korean (ko)
Inventor
김진식
Original Assignee
두산인프라코어 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 두산인프라코어 주식회사 filed Critical 두산인프라코어 주식회사
Priority to KR1020110142920A priority Critical patent/KR20130074858A/en
Publication of KR20130074858A publication Critical patent/KR20130074858A/en

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Classifications

    • 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
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/755—Control of acceleration or deceleration of the output member

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

According to the present invention, a construction machine is connected to at least one of the hydraulic pump, the control valve and the work device is provided with a fluid from the hydraulic pump by the control of the control valve for the construction machine including a cylinder device for controlling the operation of the work device In the cylinder device 10, the cylinder (11) having a hollow in the longitudinal direction therein; A piston rod 12 inserted from the top of the cylinder 11; A piston valve (13) connected to the piston rod (12) to reciprocate in the cylinder (11); MR fluid (15) is filled in the hollow portion of the cylinder (11); A construction machine having a cylinder device to which an MAL damper is applied is provided in the piston valve 13 and includes a solenoid 16 for generating a magnetic field when supplying current to change the viscosity of the MAl fluid 15. .

Description

CONSTRUCTION MACHINERY WITH CYLINDER APPARATUS EMPLOYING MR DAMPER}

The present invention relates to a construction machine, and more particularly, the MAL damper is applied to the interior of the boom cylinder, arm cylinder and bucket cylinder device of the construction machine, respectively, the contact of the boom, arm and bucket through the flow of current through the boom, The present invention relates to a construction machine having a cylinder device to which an MAL damper can be applied to cushion a direct impact between an arm and a bucket and each cylinder device.

Generally, a hydraulic power control system is used for construction machinery such as an excavator, and the hydraulic system is a hydraulic load connected to an output shaft of an engine via a control valve, and a work load of a boom cylinder device, an arm cylinder device, a bucket cylinder device, and the like. It is designed to supply pressure oil to the.

Here, the cylinder devices can absorb direct impacts with the boom, arm and bucket when the pistons connected to the boom, arm and bucket move inside the cylinder, ie when the boom, arm and bucket are unfolded and folded during operation, respectively. Dampers are applied to dampen free vibrations by means of chassis springs. The damper converts energy of vertical motion or reciprocation motion into thermal energy to absorb free vibration of the chassis spring and to attenuate it quickly.

However, the conventional cylinder arrangements as described above simply damp the free vibration through the chassis spring only when the piston moves inside the cylinder, so that the elastic force of the chassis spring is weakened when used for a long time, thereby always vibrating and shocking. Due to the characteristics of the exposed cylinder, there is a problem in that stability and durability cannot be guaranteed for a long time, and when the life is shortened, a direct collision with the boom, the arm and the bucket occurs, and the construction machine cannot be normally operated.

The present invention has been made to solve the problems as described above, the MAL damper is applied to the cylinder of the construction machine and after sensing the contact of the boom, arm and bucket through the sensor viscosity of the MAL fluid through the flow of current It is an object of the present invention to provide a construction machine having a cylinder device to which the MD damper is applied to change the speed of the piston valve.

Meanwhile, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, according to the present invention, a cylinder device is connected to at least one of the hydraulic pump, the control valve and the working device to receive fluid from the hydraulic pump by the control of the control valve to control the operation of the working device ( In the construction machine comprising a 10), the cylinder device 10 includes a cylinder (11) having a hollow in the longitudinal direction therein; A piston rod 12 inserted from the top of the cylinder 11; A piston valve (13) connected to the piston rod (12) to reciprocate in the cylinder (11); MR fluid (15) is filled in the hollow portion of the cylinder (11); A construction machine having a cylinder device to which an MAL damper is applied is provided in the piston valve 13 and includes a solenoid 16 for generating a magnetic field when supplying current to change the viscosity of the MAl fluid 15. .

According to the construction machine having the cylinder device to which the MAL damper is applied as described above, the MAL damper is applied to the cylinder of the construction machine and the contact of the boom, arm and bucket is sensed through the sensor module, and the By changing the viscosity, the movement speed of the piston valve can be controlled to reduce the direct impact of the boom, arm and bucket and the cylinder, thereby increasing the sensitivity quality and extending the endurance life of the cylinder.

On the other hand, the effects of the present invention is not limited to the effects mentioned above, other effects that are not mentioned will be understood by those skilled in the art from the description of the claims.

1 is a view showing a construction machine having a cylinder to which the MR damper is applied according to a preferred embodiment of the present invention.
Figure 2 is a cross-sectional view showing a cylinder applied to the MR damper in the construction machine according to a preferred embodiment of the present invention.
3 is a view showing the resistance of the MR fluid in accordance with the supply of current in the MR damper of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a construction machine having a cylinder device is applied to the MD damper according to a preferred embodiment of the present invention, Figure 2 is a cross-sectional view showing a cylinder device is applied to the MR damper in a construction machine according to a preferred embodiment of the present invention 3 is a view showing the resistance of the MR fluid according to the supply of current in the MR damper of FIG.

As shown in Figures 1 to 3, a construction machine having a cylinder device to which the MD damper according to the preferred embodiment of the present invention is applied, a hydraulic pump, a control valve and a boom (1), an arm (2) and a bucket (3) And a hydraulic drive unit which is connected to each of the cylinders 10 for controlling the operation of the boom 1, the arm 2, and the bucket 3 by receiving fluid from the hydraulic pump under the control of the control valve. And, the cylinder device is applied to the LM (1), the arm (2) and the bucket (3) is a damper for preventing direct collisions through the flow of current when in contact with the cylinder.

Here, the cylinder device 10 is connected to a cylinder (11) having a hollow in the longitudinal direction therein, a piston rod (12) inserted from an upper portion of the cylinder (11), the piston rod (12) and a cylinder ( A piston valve 13 reciprocating in the interior 11, a guide rod 14 coupled to the upper end of the cylinder 11 to guide the reciprocation of the piston rod 12 while sealing the cylinder 11, the cylinder (11) Solenoid (16), the solenoid is provided in the MR fluid 15 to the hollow portion of the hollow, the piston valve 13 to generate a magnetic field when supplying current from the outside to change the viscosity of the MR fluid (15) A current that supplies current to the solenoid 16 when the boom 1, arm 2 and bucket 3, which are electrically connected to the 16 and connected to the end of the piston rod 12, contact the cylinder 11. The boom (1), the arm (2) by detecting the movement of the feeder and the piston rod 12 And a bucket (3) comprises a sensor module that determines whether or not to be in contact with the cylinder 11.

Herein, magnetorheological fluid (15), also called a magnetic fluid, is a solution in which particles having micron size magnets (15a) are dispersed in a nonconductive solvent such as silicone oil or mineral oil, and are free of magnetic field. In this case, the particles 15a move freely, but when a magnetic field is applied, the particles 15a are polarized and arranged in a direction parallel to the magnetic field, thereby having a shear force or a resistance to flow.

Therefore, the cylinder device 10 to which the MAL damper of the above-described configuration is applied, when the state of the boom 1, the arm 2 and the bucket 3 is detected as they come into contact with the end of the cylinder 11 When a current is applied to the solenoid 16 from the current supply device so that a magnetic field is formed in the transverse direction of the cylinder 11, the particles 15a of the MR fluid 15 are polarized in the transverse direction of the cylinder 11. By providing a resistance to the movement of the piston valve 13 it is possible to control the damping force according to the impact.

Here, the cylinder device 10, by detecting the movement of the piston rod 12 determines whether the boom (1), arm (2) and bucket 3 in contact with the cylinder (11) through the sensor module. The sensor module includes a distance sensor positioned at an end of the piston rod 12 and an end of the cylinder 11 connected to each of the boom 1, the arm 2 and the bucket 3, or It is provided in the guide rod 14 is composed of a relative displacement sensor for detecting the movement of the piston rod 12 in a non-contact manner and an acceleration sensor for sensing the acceleration in the vertical or horizontal direction of the cylinder (11).

Therefore, according to the cylinder device 10, the movement speed of the boom (1), the arm (2) and the bucket (3) through the sensor module to measure the movement speed of the solenoid (16) by the current supply device To control the large magnetic field to be generated through this, by increasing the viscosity of the MR fluid 15 can be a large damping force is generated.

On the other hand, in the cylinder device 10 according to a preferred embodiment of the present invention, after confirming the movement of the piston rod through the sensor module, the current is supplied to the solenoid 16 from the external current supply device through a wire or the like. However, after the piezoelectric elements are provided at both ends of the cylinder 11 instead of the current supply device, the inside of the cylinder 11 generated by the flow of the MR fluid 15 when the piston valve 13 moves. By the pressure, the current can be supplied from the piezoelectric element.

Therefore, it is not necessary to configure the sensor module and the current supply device as described above, it is possible to simplify the configuration and save cost.

Hereinafter, with reference to the drawings will be described the operation of the construction machine having a cylinder device to which the MD damper is applied according to a preferred embodiment of the present invention.

First, the boom 1, the arm 2 and the bucket which are extended by the piston rod 12 extending from the piston valve 13 which receives the fluid from the hydraulic pump under the control of the control valve and reciprocates the cylinder 11. When (3) is folded, respectively, whether the piston rod 12 is moved in the opposite direction of the cylinder 11 by the sensor module or the contact between the boom 1, the arm 2 and the bucket 3 and the cylinder 11 Whether it is detected.

Thereafter, when the piston rod 12 moves in the opposite direction of the cylinder 11 or when the boom 1, the arm 2 and the bucket 3 are determined to be in contact with the cylinder 11, the current supply device. The electric current is supplied from the solenoid 16 wound around the piston valve 13 to form a magnetic field in the transverse direction of the cylinder 11.

Thereafter, the particles 15a of the MAl fluid 15 are arranged in a direction parallel to the direction in which the magnetic field is formed by the magnetic field generated by the solenoid 16, thereby increasing the viscosity of the Mal fluid 15. As a result, a strong resistance force is generated when the piston valve 13 moves in the opposite direction of the cylinder 11.

Therefore, according to the construction machine having a cylinder device to which the MAL damper is applied as described above, the MAL damper 10 is applied to the cylinder 11 of the construction machine and the contact of the boom 1, the arm 2, and the bucket 3 is applied. Is detected through the sensor module, and by changing the viscosity of the M fluid (15) through the flow of current, by controlling the moving speed of the piston valve 13 can reduce the direct impact of the boom, arm, bucket and cylinder and Accordingly, it is possible to increase the sensitivity quality and to extend the durability life of the cylinder.

While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains have various permutations and modifications without departing from the spirit or essential features of the present invention. It is to be understood that the present invention may be practiced in other specific forms, since modifications may be made. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect.

Claims (2)

In the construction machine comprising a cylinder device (10) connected to at least one of the hydraulic pump and the control valve and the work device receives fluid from the hydraulic pump under the control of the control valve to control the operation of the work device,
The cylinder device 10,
A cylinder 11 having a hollow in the longitudinal direction therein;
A piston rod 12 inserted from the top of the cylinder 11;
A piston valve (13) connected to the piston rod (12) to reciprocate in the cylinder (11);
MR fluid (15) is filled in the hollow portion of the cylinder (11);
And a solenoid (16) provided in the piston valve (13) to generate a magnetic field when supplying current to change the viscosity of the MR fluid (15). According to claim 1, Sensor module for determining whether the working device is in contact with the cylinder 11 by detecting the movement of the piston rod (12); And
And a current supply device electrically connected to the solenoid 16 to supply a current to the solenoid 16 when the work device connected to the end of the piston rod 12 contacts the cylinder 11. Construction machinery having a cylinder device with MR dampers.
KR1020110142920A 2011-12-27 2011-12-27 Construction machinery with cylinder apparatus employing mr damper KR20130074858A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110142920A KR20130074858A (en) 2011-12-27 2011-12-27 Construction machinery with cylinder apparatus employing mr damper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110142920A KR20130074858A (en) 2011-12-27 2011-12-27 Construction machinery with cylinder apparatus employing mr damper

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KR20130074858A true KR20130074858A (en) 2013-07-05

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KR1020110142920A KR20130074858A (en) 2011-12-27 2011-12-27 Construction machinery with cylinder apparatus employing mr damper

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109519437A (en) * 2017-09-20 2019-03-26 上海梅山钢铁股份有限公司 A kind of small space oil cylinder quick replacement device and replacing options
KR20190042796A (en) 2017-10-17 2019-04-25 건양대학교산학협력단 Closed Shear Type MRG(Magneto Rheological-Grease Fluid) Damper

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109519437A (en) * 2017-09-20 2019-03-26 上海梅山钢铁股份有限公司 A kind of small space oil cylinder quick replacement device and replacing options
CN109519437B (en) * 2017-09-20 2020-10-23 上海梅山钢铁股份有限公司 Device and method for quickly replacing oil cylinder in narrow space
KR20190042796A (en) 2017-10-17 2019-04-25 건양대학교산학협력단 Closed Shear Type MRG(Magneto Rheological-Grease Fluid) Damper

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