KR200389672Y1 - Apparatus for preventing boom pitching in wheel typed loader - Google Patents

Apparatus for preventing boom pitching in wheel typed loader Download PDF

Info

Publication number
KR200389672Y1
KR200389672Y1 KR20-1999-0012338U KR19990012338U KR200389672Y1 KR 200389672 Y1 KR200389672 Y1 KR 200389672Y1 KR 19990012338 U KR19990012338 U KR 19990012338U KR 200389672 Y1 KR200389672 Y1 KR 200389672Y1
Authority
KR
South Korea
Prior art keywords
boom
valve
side chamber
bucket
head side
Prior art date
Application number
KR20-1999-0012338U
Other languages
Korean (ko)
Other versions
KR20010001832U (en
Inventor
김형석
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 KR20-1999-0012338U priority Critical patent/KR200389672Y1/en
Publication of KR20010001832U publication Critical patent/KR20010001832U/en
Application granted granted Critical
Publication of KR200389672Y1 publication Critical patent/KR200389672Y1/en

Links

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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover 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
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

본 고안은 휠로더의 붐상하반동방지장치에 관한 것으로, 특히 휠로더에서 버켓에 적재물을 적재하여 들어올린 상태에서 버켓덤프작동시 그 작업하중에 따른 붐의 상하반동현상을 방지하기 위하여, 버켓덤프동작시 최대하중을 받는 붐실린더(18)의 헤드측 체임버(18a)와 어큐물레이터(21)를 연결하는 제1분기라인(19c) 상에 차단밸브(23)를 설치하고, 이 차단밸브(23)는 리모트 콘트롤밸브(13)의 덤프 파이롯신호압을 받아 절환작동하여 상기 어큐물레이터(21)에서 붐실린더(18)의 헤드측 체임버(18a)쪽으로 또는 그 역방향으로 압유가 흐르는 것을 차단하도록 한 것이다.The present invention relates to a boom up and down rebound prevention device of the wheel loader, in particular, to prevent the boom up and down rebound phenomenon according to the work load when the bucket dump operation in the state of lifting the load on the bucket from the wheel loader, A shutoff valve 23 is provided on the first branch line 19c connecting the accumulator 21 and the head side chamber 18a of the boom cylinder 18 that receives the maximum load. Is switched to receive the dump pilot signal pressure of the remote control valve 13 to block the flow of the hydraulic oil from the accumulator 21 toward the head side chamber 18a of the boom cylinder 18 or in the reverse direction. will be.

Description

휠로더의 붐상하반동방지장치{ Apparatus for preventing boom pitching in wheel typed loader}Apparatus for preventing boom pitching in wheel typed loader}

본 고안은 휠로더의 붐 상하반동방지장치에 관한 것으로, 특히 휠로더에서 버켓에 적재물을 적재하여 들어올린 상태에서 버켓덤프작동시 그 작업하중에 따른 붐의 상하반동현상을 방지하는 장치에 관한 것이다.The present invention relates to a boom up and down rebound prevention device of the wheel loader, and more particularly to a device for preventing the up and down rebound phenomenon of the boom according to the work load when the bucket dump operation in the state of lifting the load on the bucket in the wheel loader.

휠 로더가 고르지않은 노면을 주행할 때 붐이 자중에 의해 상하로 진동하면서 휠로더 전체를 상하로 진동시키는 현상, 소위 피칭(pitching)현상이 발생하는 데, 이 피칭현상을 방지하기 위하여 휠로더에는 붐의 진동을 흡수완충하는 완충장치가 구비되어 있다.When the wheel loader travels on an uneven road, the boom vibrates up and down by its own weight, causing the entire wheel loader to vibrate up and down, so-called pitching phenomenon.In order to prevent this phenomenon, A shock absorber for absorbing and absorbing vibration is provided.

상기 종래의 휠로더는, 도 3의 유압회로도에 도시된 바와 같이, 유압펌프(31)와, 각각의 입구포트가 공급라인(32)을 통하여 상기 유압펌프(31)에 각각 연결되는 콘트롤밸브(33)의 버켓제어스풀(34) 및 붐제어스풀(35)과, 헤드측 체임버(36a)와 로드측 체임버(36b)를 구비하고 이들 각각의 체임버(36a,36b)는 제1압유라인(37a) 및 제2압유라인(37b)을 통하여 상기 버켓제어스풀(34)과 연결된 버켓실린더(36)와, 헤드측 체임버(38a)와 로드측 체임버(38b)를 구비하고, 상기 헤드측 체임버(38a)와 로드측 체임버(38b)는 제3압유라인(39a) 및 제4압유라인(39b)을 통하여 각각 붐제어스풀(35)에 연결된 버켓실린더(36) 및 상기 붐실린더(38)의 헤드측 체임버(38a)와 로드측 체임버(38b)에 연결된 상기 제3압유라인(39a) 및 제4압유라인(39b)에서 각각 분기된 제1분기라인(39c)과 제2분기라인(39d)에 설치된 완충장치(40)을 포함한 구성으로 되어 있다.The conventional wheel loader, as shown in the hydraulic circuit diagram of Figure 3, the hydraulic pump 31 and the control valve 33, each inlet port is connected to the hydraulic pump 31 through the supply line 32, respectively Bucket control spool 34 and boom control spool 35, head side chamber 36a and rod side chamber 36b, and each of these chambers 36a and 36b has a first pressure oil line 37a. And a bucket cylinder 36 connected to the bucket control spool 34 through the second oil pressure line 37b, a head side chamber 38a and a rod side chamber 38b, and the head side chamber 38a) and the rod side chamber 38b are a bucket cylinder 36 and the boom cylinder 38 connected to the boom control spool 35 through a third hydraulic oil line 39a and a fourth hydraulic oil line 39b, respectively. A first branch line 39c and a second branch line branched from the third hydraulic oil line 39a and the fourth hydraulic oil line 39b respectively connected to the head side chamber 38a and the rod side chamber 38b of the first side. Snow on 39d The shock absorber 40 is configured.

그리고 상기 완충장치(40)는 상기 제1분기라인(39c)에 연결설치되어 상기 제3압유라인(39a)의 라인압력을 일정하게 일정하게 유지해주는 어큐물레이터(41)와, 이 어큐물레이터(41)가 연결된 상기 제1분기라인(39c)에 설치되어 완충 선택스위치(도시안됨)가 온되는 경우에 상기 어큐물레이터(41)쪽으로 압유를 공급하도록 된 차단밸브(42)로 이루어져 있다.The shock absorber 40 is connected to the first branch line 39c to accumulate and maintain the line pressure of the third pressure oil line 39a at a constant level. It is composed of a shut-off valve 42 is installed in the first branch line (39c) connected to the oscillator 41 to supply pressure oil to the accumulator 41 when the buffer selection switch (not shown) is turned on. .

따라서 상기와 같이 구성된 종래의 휠로더를 정지시킨 상태에서 작업을 하고자 하는 경우에 작업자가 리모트콘트롤밸브를 좌우로 조작하면, 이 리모트 콘트롤밸브로부터 발생하는 파이롯신호압이 버켓제어스풀 또는 붐제어스풀의 좌우측에 선택적으로 가해져 버켓제어스풀 또는 붐제어스풀을 도면상 좌측 또는 우측으로 절환시키고, 이에 따라 펌프의 압유는 버켓실린더 또는 붐실린더의 체임버에 각각 공급되어 붐을 승강시키거나 버켓을 작동시키게 된다.Therefore, when the operator operates the remote control valve from side to side when the user wants to work in the state of stopping the conventional wheel loader configured as described above, the pilot signal pressure generated from the remote control valve becomes the bucket control spool or the boom control spool. It is selectively applied to the left and right sides to switch the bucket control spool or the boom control spool to the left or right in the drawing, accordingly, the pressure oil of the pump is supplied to the bucket cylinder or the chamber of the boom cylinder, respectively, to raise or lower the boom or to operate the bucket.

작업을 중지하고 주행을 하는 경우에는 붐실린더와 버켓실린더로 공급되는 압유를 차단하여 붐과 버켓을 고정시키고, 동시에 붐의 진동을 방지하기 위해 선택스위치를 온시켜 완충장치(40)를 작동시킨다. 이 경우 리모트콘트롤밸브에서 버켓제어스풀(34)과 붐제어스풀(35)쪽으로는 어떠한 파이롯압력이 작용하지 않으므로 상기 버켓제어스풀(34)과 붐제어스풀(35)는 중립위치에 있게 되어 유압펌프(31)에서 토출되는 압유가 공급라인(32)을 따라 탱크(T)로 드레인된다. When the operation is stopped and driving, the pressure oil supplied to the boom cylinder and the bucket cylinder is blocked to fix the boom and the bucket, and at the same time, the selection switch is turned on to prevent the vibration of the boom to operate the shock absorber 40. In this case, since no pilot pressure is applied to the bucket control spool 34 and the boom control spool 35 from the remote control valve, the bucket control spool 34 and the boom control spool 35 are in a neutral position and the hydraulic pressure is reduced. The pressure oil discharged from the pump 31 is drained to the tank T along the supply line 32.

그리고 선택스위치가 온되어 상기 차단밸브(42,43)가 절환되면 헤드측 체임버(38a)가 어큐물레이터(41)와 연통됨으로써 붐실린더(38)가 진동할 때, 그 진동범위(통상 100mm)에 대응하는 붐실린더의 변동유량을 어큐물레이터(41)가 흡수 또는 방출하여 붐실린더를 상하로 완충시켜준다.Then, when the selector switch is turned on and the shutoff valves 42 and 43 are switched, the head side chamber 38a communicates with the accumulator 41 so that the boom cylinder 38 vibrates, the vibration range of which is typically 100 mm. The accumulator 41 absorbs or discharges the fluctuation flow rate of the boom cylinder corresponding to the boom cylinder, thereby buffering the boom cylinder up and down.

그러나 상기와 같은 완충장치가 구비된 휠로더는 버켓에 작업물을 적재하여 버켓을 최고높이로 상승시킨 상태에서 트럭 등에 상차하기 위해 덤프하는 경우에는 그 덤프동작시 버켓의 관성모우멘트에 의해 붐실린더(38)에 최대 하중이 가해지게 되고, 이에 따라 붐실린더(38)의 헤드측 체임버(38a)의 압유가 어큐물레이터(41)쪽으로 역류함으로써 붐실린더(38)가 상하로 반동하여 버켓 하단이 트럭에 부딪히는 문제점이 있었다.However, when the wheel loader equipped with the above shock absorber is dumped for loading onto a truck in a state in which the bucket is loaded to the highest height by loading a workpiece into the bucket, the boom cylinder may be caused by the moment of inertia of the bucket during the dumping operation. 38), the maximum load is applied, and accordingly, the hydraulic pressure of the head side chamber 38a of the boom cylinder 38 flows back toward the accumulator 41, so that the boom cylinder 38 rebounds up and down, so that the bottom of the bucket There was an issue encountered.

이에 본 고안은 상기한 바와 같은 문제점을 해소하기 위해 제안된 것으로서, 휠로더에서 버켓에 적재물을 적재하여 들어올린 상태에서 버켓덤프작동시 그 작업하중에 따른 붐의 상하반동현상을 방지하는 장치를 제공함에 목적이 있다.The present invention is proposed to solve the above problems, to provide a device for preventing the up and down rebound of the boom according to the work load when the bucket dump operation in the state of lifting the load on the bucket from the wheel loader. There is a purpose.

상기 목적을 달성하기 위한 본 고안은 버켓덤프동작시 최대하중을 받는 붐실린더의 헤드측 체임버와 어큐물레이터를 연결하는 제1분기라인 상에 차단밸브를 설치하고, 이 차단밸브는 리모트 콘트롤밸브의 덤프 파이롯신호압을 받아 절환작동하여 상기 어큐물레이터에서 붐실린더의 헤드측 체임버쪽으로 또는 그 역방향으로 압유가 흐르는 것을 차단하도록 된 구성에 특징이 있는 것이다.The present invention for achieving the above object is to install a shut-off valve on the first branch line connecting the accumulator and the head-side chamber of the boom cylinder that is subjected to the maximum load during the bucket dump operation, the shut-off valve of the remote control valve It is characterized in that the configuration is configured to block the flow of the hydraulic oil from the accumulator to the head side chamber of the boom cylinder or to the reverse direction by receiving the pilot pilot signal pressure.

이러한 구조로 이루어진 본 고안은 휠로더에서 상차하기 위해 버켓덤프신호압를 보내면 이 버켓덤프신호압은 차단밸브를 절환시켜 상기 어큐물레이터에서 붐실린더의 헤드측 체임버쪽으로 또는 그 역방향으로 압유가 흐르는 것을 차단함으로써 덤프작동시 붐이 상하로 반동하는 현상을 방지한다.The present invention having such a structure sends a bucket dump signal pressure to be loaded from the wheel loader, and the bucket dump signal pressure switches the shutoff valve to block the flow of hydraulic oil from the accumulator to the head side chamber of the boom cylinder or the reverse direction. This prevents the boom from recoil up and down during the dump operation.

이하 본 고안의 실시예들을 첨부도면에 따라 자세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 고안의 제1실시예에 따른 장치를 나타낸 유압회로도이다. 1 is a hydraulic circuit diagram showing an apparatus according to a first embodiment of the present invention.

본 고안의 제1실시예가 적용된 휠로더는, 도 1에 도시된 바와 같이, 유압펌프(11)와, 각각의 입구포트가 공급라인(12)을 통하여 상기 유압펌프(11)에 각각 연결되고, 리모트 콘트롤밸브(13)로 부터 파이롯신호압을 받아서 절환하는 버켓제어스풀(14) 및 붐제어스풀(15)과, 헤드측 체임버(16a)와 로드측 체임버(16b)를 구비하고 이들 각각의 체임버(16a,16b)는 제1압유라인(17a) 및 제2압유라인(17b)을 통하여 상기 버켓제어스풀(14)과 연결된 버켓실린더(16)와, 헤드측 체임버(18a)와 로드측 체임버(18b)를 구비하고, 상기 헤드측 체임버(18a)와 로드측 체임버(18b)는 제1압유라인(19a) 및 제4압유라인(19b)을 통하여 각각 붐제어스풀(15)에 연결된 붐실린더(18) 및 상기 붐실린더(18)의 헤드측 체임버(18a)와 로드측 체임버(18b)에 연결된 상기 제3압유라인(19a) 및 제4압유라인(19b)에서 각각 분기된 제1분기라인(19c)에 설치된 완충장치(20)을 포함한다.In the wheel loader to which the first embodiment of the present invention is applied, as shown in FIG. 1, the hydraulic pump 11 and each inlet port are connected to the hydraulic pump 11 through a supply line 12, respectively, A bucket control spool 14 and a boom control spool 15 for receiving the pilot signal pressure from the control valve 13 and having a head side chamber 16a and a rod side chamber 16b are provided. 16a and 16b are bucket cylinders 16 connected to the bucket control spool 14 via the first oil pressure line 17a and the second oil pressure line 17b, the head side chamber 18a and the rod side. A chamber 18b is provided, and the head side chamber 18a and the rod side chamber 18b are respectively connected to the boom control spool 15 through the first pressure oil line 19a and the fourth pressure oil line 19b. In the connected boom cylinder 18 and the third hydraulic oil line 19a and the fourth hydraulic oil line 19b connected to the head side chamber 18a and the rod side chamber 18b of the boom cylinder 18, respectively. It comprises a buffer 20 provided in the first branch line branch (19c).

그리고 상기 완충장치(20)는 상기 제1분기라인(19c)에 연결설치되어 상기 제1압유라인(19a)의 라인압력을 일정하게 일정하게 유지해주는 어큐물레이터(21)와, 이 어큐물레이터(21)가 연결된 상기 제1분기라인(19c)에 설치되어 완충 선택스위치(S1)를 온 또는 오프시키는 경우에 상기 어큐물레이터(21)쪽으로 압유를 공급 또는 차단하도록 된 선택밸브(22)로 이루어져 있다.And the shock absorber 20 is connected to the first branch line (19c) and accumulator 21 for maintaining a constant constant line pressure of the first pressure oil line (19a) and the accumulator Selector valve 22 is installed in the first branch line 19c to which the oscillator 21 is connected to supply or shut off the pressurized oil toward the accumulator 21 when the buffer selection switch S1 is turned on or off. Consists of

또한 본 고안의 제1실시예는 상기 제1분기라인(19c)상에 차단밸브(23)가 연결설치되고, 이 차단밸브(23)는 상기 리모트콘트롤밸브(13)에서 파이롯라인(b)를 따라 발생되는 버켓덤프신호압에 의해 절환되어 상기 제1분기라인(19c)을 차단하게 되어 있다. In addition, according to the first embodiment of the present invention, a shutoff valve 23 is installed on the first branch line 19c, and the shutoff valve 23 is a pilot line b in the remote control valve 13. It is switched by the bucket dump signal pressure generated along the to block the first branch line (19c).

한편, 본 고안의 제2실시예는, 도 2에 도시된 바와 같이, 상기 완충장치(20)의 선택밸브(22)가 솔레노이드밸브로 이루어지고, 이 선택밸브(22)의 솔레노이드부(22a)는 압력스위치(S2)를 통하여 상기 선택스위치(S1)와 전기적으로 직렬연결되고, 상기 압력스위치(S2)는 상기 리모트콘트롤밸브(13)에서 파이롯라인(b)를 따라 발생되는 버켓덤프신호압에 의해 오프되는 구조로 되어 있는 것이다.On the other hand, in the second embodiment of the present invention, as shown in Figure 2, the selection valve 22 of the shock absorber 20 is composed of a solenoid valve, the solenoid portion 22a of the selection valve 22 Is connected in series with the selection switch (S1) via a pressure switch (S2), the pressure switch (S2) is a bucket dump signal pressure generated along the pilot line (b) in the remote control valve (13) It is a structure turned off by.

상기 본 고안의 제2실시예에 따르면, 상차작업시 상기 리모트콘트롤밸브(13)를 조작하여 버켓덤프신호압을 발생시키면, 이 버켓덤프신호압은 상기 압력스위치(S2)를 오프시켜 완충장치의 선택밸브(22)를 소자시키고, 이에 따라 선택밸브(22)는 붐실린더(18)의 헤드측 체임버(18a)와 어큐물레이터(21)를 서로 연결하는 제1분기라인(19c)를 차단시킴으로써 붐실린더(18)의 헤드측 체임버(18a)에서 어큐물레이터(21)쪽으로 압유가 흐르지 않도록 하기 때문에 붐실린더(18)가 상하반동하는 것을 방지하게 된다.According to the second embodiment of the present invention, if the bucket dump signal pressure is generated by operating the remote control valve 13 during the loading operation, the bucket dump signal pressure is turned off the pressure switch (S2) of the shock absorber By deselecting the selector valve 22, the selector valve 22 shuts off the first branch line 19c connecting the head side chamber 18a of the boom cylinder 18 and the accumulator 21 to each other. Since the hydraulic oil does not flow from the head side chamber 18a of the boom cylinder 18 toward the accumulator 21, the boom cylinder 18 is prevented from recoil up and down.

이상에서 설명한 바와 같이 본 고안의 장치에 따르면, 휠로더에서 상차하기 위해 버켓덤프신호압를 보내면 이 버켓덤프신호압은 차단밸브를 절환시켜 상기 어큐물레이터에서 붐실린더의 헤드측 체임버쪽으로 또는 그 역방향으로 압유가 흐르는 것을 차단함으로써 덤프작동시 붐이 상하반동하는 현상을 방지하므로, 상차작업시 버켓이 차량에 부딪히는 것을 막을 수 있다.As described above, according to the device of the present invention, when the bucket dump signal pressure is sent to be loaded from the wheel loader, the bucket dump signal pressure is switched to the shutoff valve and the accumulator is pressed from the accumulator to the head side chamber of the boom cylinder or vice versa. By blocking the flow of oil to prevent the boom from recoil up and down during the dump operation, it is possible to prevent the bucket from hitting the vehicle during the loading operation.

도 1 은 본 고안의 제1실시예에 따른 휠로더의 붐상하반동방지장치의 개략적인 유압회로도,1 is a schematic hydraulic circuit diagram of an apparatus for preventing boom up and down rebound of a wheel loader according to a first embodiment of the present invention;

도 2 는 본 고안의 제2실시예에 따른 휠로더의 붐상하반동방지장치의 개략적인 유압회로도,2 is a schematic hydraulic circuit diagram of an apparatus for preventing boom up and down rebound of a wheel loader according to a second embodiment of the present invention;

도 3 은 종래 휠로더의 붐상하반동방지장치의 개략적인 유압회로도이다.3 is a schematic hydraulic circuit diagram of a conventional boom up and down rebound prevention device of a wheel loader.

※ 도면의 주요부분에 대한 부호의 설명 ※ ※ Explanation of code about main part of drawing ※

11: 유압펌프 12: 공급라인11: hydraulic pump 12: supply line

13: 리모트 콘트롤밸브 b: 파이롯라인13: remote control valve b: pilot line

14: 버켓제어스풀 15: 붐제어스풀14: Bucket Control Spool 15: Boom Control Spool

16: 버켓실린더 16a: 헤드측 체임버16: bucket cylinder 16a: head side chamber

16b:로드측 체임버 17a: 제1압유라인16b: rod side chamber 17a: first pressure oil line

17b: 제2압유라인 17b: 2nd oil pressure line

18: 붐실린더 18a: 헤드측 체임버18: Boom cylinder 18a: Head side chamber

18b:로드측 체임버 19a: 제1압유라인18b: Rod side chamber 19a: First pressure oil line

19b: 제4압유라인 19c: 제1분기라인19b: fourth hydraulic oil line 19c: first branch line

19d: 제2분기라인 20: 완충장치19d: 2nd branch line 20: shock absorber

21: 어큐물레이터 22: 선택밸브21: Accumulator 22: Selection valve

22a: 솔레노이드부 S1: 완충 선택스위치22a: solenoid part S1: buffer selection switch

23: 차단밸브 31: 유압펌프23: shut-off valve 31: hydraulic pump

32: 공급라인 33: 리모트 콘트롤밸브32: supply line 33: remote control valve

34: 버켓제어스풀 35: 붐제어스풀34: Bucket control spool 35: Boom control spool

36: 버켓실린더36: bucket cylinder

36a: 헤드측 체임버 36b: 로드측 체임버36a: head side chamber 36b: rod side chamber

37a: 제1압유라인 37b: 제2압유라인37a: first hydraulic oil line 37b: second hydraulic oil line

38: 붐실린더 38a: 헤드측 체임버38: boom cylinder 38a: head side chamber

38b: 로드측 체임버 39a: 제3압유라인38b: Rod side chamber 39a: Third pressure oil line

39b: 제4압유라인 39c: 제1분기라인39b: fourth hydraulic oil line 39c: first branch line

39d: 제2분기라인 40: 완충장치39d: second branch line 40: shock absorber

41: 어큐물레이터 S1: 완충 선택스위치41: accumulator S1: buffer selection switch

42,43: 차단밸브42,43: shutoff valve

Claims (2)

붐실린더(18)의 헤드측 체임버(18a)와 붐 완충용 어큐물레이터(21)를 연결하는 제1분기라인(19c)상에 차단밸브(23)가 연결설치되어 상기 차단밸브(23)의 절환작동에 의해 상기 제1분기라인(19c)를 통하여 상기 붐실린더 헤드측 체임버(18a)와 어큐물레이터(21)의 압유흐름을 허용하거나 차단하도록 된 휠로더의 붐상하반동방지장치에 있어서, A shutoff valve 23 is connected to the first branch line 19c connecting the head side chamber 18a of the boom cylinder 18 and the boom buffer accumulator 21 to connect the shutoff valve 23. In the boom up and down rebound prevention device of the wheel loader to allow or block the hydraulic oil flow of the boom cylinder head side chamber 18a and the accumulator 21 through the first branch line (19c) by the switching operation , 상기 차단밸브(23)는 리모트콘트롤밸브(13)에서 발생되는 버켓덤프신호압(b)의 유무에 따라 상기 제1분기라인(19c)을 개방 또는 차단하게 된 것을 특징으로 하는 휠로더의 붐상하반동방지장치. The shutoff valve 23 is a boom up and down rebound of the wheel loader, characterized in that for opening or blocking the first branch line (19c) according to the presence or absence of the bucket dump signal pressure (b) generated from the remote control valve (13) Prevention device. 붐실린더(18)의 헤드측 체임버(18a)와 붐 완충용 어큐물레이터(21)를 상호 연결하는 제1분기라인(19c)상에 이 제1분기라인(19c)을 개폐하는 개폐밸브가 구비되어 상기 개폐밸브의 절환작동에 의해 상기 제1분기라인(19c)를 통하여 상기 붐실린더 헤드측 체임버(18a)와 어큐물레이터(21) 사이의 압유흐름을 허용하거나 차단하도록 된 휠로더의 붐상하반동방지장치에 있어서, An opening / closing valve for opening and closing the first branch line 19c is provided on the first branch line 19c connecting the head side chamber 18a of the boom cylinder 18 and the boom buffer accumulator 21 to each other. Boom up and down recoil of the wheel loader which permits or blocks the hydraulic oil flow between the boom cylinder head side chamber 18a and the accumulator 21 through the first branch line 19c by the switching operation of the on / off valve. In the prevention device, 상기 개폐밸브는 솔레노이드 선택밸브(22)로 구성되고, 상기 선택밸브(22)는 압력스위치(22)를 매개로 전원에 연결되며, 상기 압력스위치(22)는 리모트콘트롤밸브에서 발생되는 버켓덤프신호압(b)에 의해 상기 선택밸브(22)를 소자시켜 상기 제1분기라인(19c)을 차단하게 된 것을 특징으로 하는 휠로더의 붐상하반동방지장치. The on-off valve is composed of a solenoid selection valve 22, the selection valve 22 is connected to the power supply via the pressure switch 22, the pressure switch 22 is a bucket dump signal generated from the remote control valve A device for preventing boom up and down rebound of a wheel loader, characterized in that the first valve line (19c) is cut off by demagnetizing the selection valve (22) by pressure (b) .
KR20-1999-0012338U 1999-06-30 1999-06-30 Apparatus for preventing boom pitching in wheel typed loader KR200389672Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20-1999-0012338U KR200389672Y1 (en) 1999-06-30 1999-06-30 Apparatus for preventing boom pitching in wheel typed loader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20-1999-0012338U KR200389672Y1 (en) 1999-06-30 1999-06-30 Apparatus for preventing boom pitching in wheel typed loader

Publications (2)

Publication Number Publication Date
KR20010001832U KR20010001832U (en) 2001-01-26
KR200389672Y1 true KR200389672Y1 (en) 2005-07-14

Family

ID=43690939

Family Applications (1)

Application Number Title Priority Date Filing Date
KR20-1999-0012338U KR200389672Y1 (en) 1999-06-30 1999-06-30 Apparatus for preventing boom pitching in wheel typed loader

Country Status (1)

Country Link
KR (1) KR200389672Y1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100714182B1 (en) 2006-02-16 2007-05-04 주식회사 자동기 Oil pressure device of snowplow
EP4219838A4 (en) * 2021-01-29 2024-04-03 Shanghai Sany Heavy Machinery Ltd Damping system for movable arm of loading machine, and operation machinery

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100953809B1 (en) * 2002-12-27 2010-04-21 두산인프라코어 주식회사 Apparatus for suspending boom-pitching in wheel typed loader

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100714182B1 (en) 2006-02-16 2007-05-04 주식회사 자동기 Oil pressure device of snowplow
EP4219838A4 (en) * 2021-01-29 2024-04-03 Shanghai Sany Heavy Machinery Ltd Damping system for movable arm of loading machine, and operation machinery

Also Published As

Publication number Publication date
KR20010001832U (en) 2001-01-26

Similar Documents

Publication Publication Date Title
US4969562A (en) Apparatus for suppressing quaky movements of mobile type crane
WO2009123134A1 (en) Rotation drive controlling system for construction machine
JP4855783B2 (en) Driving vibration suppression device
KR900017833A (en) Displacement suppression device of mobile crane
KR100305742B1 (en) Device for regenerating of heavy equipment
JP3162384B2 (en) Hydraulic devices for working machines with working devices
US7197872B2 (en) Hydraulic circuit in work vehicle
KR101182513B1 (en) Load isolation apparatus for wheel typed loaders
KR200389672Y1 (en) Apparatus for preventing boom pitching in wheel typed loader
JP3153864B2 (en) Running vibration suppression device for wheel type construction vehicles
KR100655974B1 (en) A regeneration hydraulic circuit for the arm cylinder in an excavator
JPS63265023A (en) Vibration suppressor for vehicular construction machine
KR100402231B1 (en) Hydraulic circuit for excavator with an option device
KR100540445B1 (en) Driving vibration control device of construction machine
KR950001048B1 (en) Load suspension system of wheel type excavator
US7117670B2 (en) Control device
KR200184025Y1 (en) Apparatus for reducing shock on the wheel typed loader in travelling mode
KR100813782B1 (en) Apparatus for preventing shock by quick operation
JPH1181391A (en) Vibration controller for working machine
KR200389671Y1 (en) Apparatus for reducing shock on the bucket of wheel typed loader in float down mode
KR0152406B1 (en) Automatic tilting system for buck of construction machine
KR0132052Y1 (en) Apparatus for impact-absorbing for a heavy machine
KR100953809B1 (en) Apparatus for suspending boom-pitching in wheel typed loader
KR100387146B1 (en) Driving Vibration Attenuation System of Heavy Construction Equipment
KR20000021940A (en) Booster for work equipment of construction machine

Legal Events

Date Code Title Description
N231 Notification of change of applicant
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 20120705

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20130705

Year of fee payment: 9

EXPY Expiration of term