JPH0253623A - Travel vibration restraining and stabilizing circuit for wheeled contruction machine - Google Patents
Travel vibration restraining and stabilizing circuit for wheeled contruction machineInfo
- Publication number
- JPH0253623A JPH0253623A JP20118688A JP20118688A JPH0253623A JP H0253623 A JPH0253623 A JP H0253623A JP 20118688 A JP20118688 A JP 20118688A JP 20118688 A JP20118688 A JP 20118688A JP H0253623 A JPH0253623 A JP H0253623A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- switch
- pressure
- switching valve
- vibration suppression
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 230000000087 stabilizing effect Effects 0.000 title claims description 3
- 230000000452 restraining effect Effects 0.000 title 1
- 238000010276 construction Methods 0.000 claims abstract description 8
- 230000001629 suppression Effects 0.000 claims description 30
- 230000000694 effects Effects 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract 1
- 239000004576 sand Substances 0.000 description 11
- 238000009412 basement excavation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 206010011224 Cough Diseases 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/005—Suspension locking arrangements
-
- 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
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
-
- 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
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2200/00—Indexing codes relating to suspension types
- B60G2200/30—Rigid axle suspensions
- B60G2200/32—Rigid axle suspensions pivoted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/46—Means for locking the suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2300/00—Indexing codes relating to the type of vehicle
- B60G2300/08—Agricultural vehicles
- B60G2300/082—Tractors
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
【発明の詳細な説明】
産業上のjll用分野
この発明は、車両本体から突出する作業装置の基端部を
上下回動自在に車両本体に枢支し、かつ、油圧的振動抑
制装置を併設した油圧シリンダで支持する形式の無緩衝
、車輪式建設機械における走行振動防止装置の作用・不
作用を切換えるとき、作業装置が自重で下降することを
自動的に排除することのできる回路に関する。[Detailed Description of the Invention] Industrial JLL Field This invention provides a system in which the base end of a working device protruding from a vehicle body is pivoted to the vehicle body so as to be movable up and down, and is also equipped with a hydraulic vibration suppression device. The present invention relates to a circuit that can automatically prevent a working device from descending under its own weight when switching between activation and deactivation of a running vibration prevention device in a non-shocked, wheeled construction machine supported by a hydraulic cylinder.
従来の技術
従来、振動抑制装置は車輪式建設機械の車両本体から突
出する作業装置を支持する油圧シリンダの負荷側回路中
に、振動抑制装置を、開閉弁により開閉自在に設け、振
動が発生する走行中にのみ振動抑制装置が油圧シリンダ
の負荷側管路に介在するように操作していた。Conventional technology Conventionally, a vibration suppressing device is installed in the load side circuit of a hydraulic cylinder that supports a working device that protrudes from the vehicle body of a wheeled construction machine, so that it can be opened and closed by an on-off valve, and vibration is generated. The vibration suppression device was operated so as to be interposed in the load-side conduit of the hydraulic cylinder only while the vehicle was running.
例えば、車輪式建設機械の代表例として第2図に示すよ
うな車輪式トラクタショベルに設けられる走行振動抑制
装置の要部実施例は第3図の如くなっている。従って、
車輪式トラクタショベルが起伏のある路面上を走行する
と、作業装置7は前車軸よりも前方に突出しており、し
かも、その重量比率は大きく、車軸は無緩衝式で全体が
ゴムタイヤで支持されているので振動が発生し易い。For example, as a representative example of a wheeled construction machine, a wheeled tractor-shovel shown in FIG. 2 is equipped with an embodiment of a driving vibration suppressing device as shown in FIG. 3. Therefore,
When the wheeled tractor excavator travels on an uneven road surface, the working device 7 protrudes further forward than the front axle, and its weight ratio is large.The axle is non-buffered and is supported entirely by rubber tires. Therefore, vibration is likely to occur.
このときの振動エネルギを吸収して減衰振動とする目的
で、作業装置7を支持するリフトシリンダ8の負荷側の
管路15aを、絞り弁18a1チエツク弁18bからな
るスローリターン弁18およびアキュムレータ19で構
成される振動抑制装置20に、分岐管路16により連通
ずることにより作業装置7を車両本体と別個に振動させ
、減衰振動に導く。In order to absorb the vibration energy at this time and dampen the vibration, the load side pipe line 15a of the lift cylinder 8 that supports the working device 7 is connected to the slow return valve 18 consisting of a throttle valve 18a and a check valve 18b, and an accumulator 19. By communicating with the vibration suppressing device 20 configured through the branch pipe 16, the working device 7 is vibrated separately from the vehicle body, leading to damped vibration.
一方、車輪式トラクタシラペルは走行することのみでは
なく、作業装置7のバケットを地面に下し、機体の前進
力で土砂に刃先をくい込ませ、パケソI・に土砂を満載
してダンプシリンダ9により引起し、リフトシリンダ8
によって作業装置7全体を持上げ、他の地点で適当な高
さに調整し、再びダンプシリンダ9を作動させ、土砂を
ダンプするという作業が多い。このような掘削・積込作
業等における積込時、ダンプ時の走行速度は、超低速か
停止状態であって、振動は発生することなく、むしろ、
バケットが車両本体に対し一体的に保持されていないと
正確で安全な作業はできないので、このようなときは、
リフトシリンダ8は振動抑制装置20と遮断されていな
ければならず、反面、走行時には、逆に、連通している
ことが望ましい。On the other hand, the wheeled tractor Shirapel not only travels, but also lowers the bucket of the working device 7 to the ground, uses the forward force of the machine to dig the cutting edge into the earth and sand, and loads the Pakeso I with earth and sand to the dump cylinder 9. and lift cylinder 8
In many cases, the entire working device 7 is lifted up, adjusted to an appropriate height at another point, and the dump cylinder 9 is operated again to dump the earth and sand. The traveling speed during loading and dumping in such excavation and loading work is extremely low or at a standstill, and vibrations do not occur;
Accurate and safe work cannot be performed unless the bucket is held integrally with the vehicle body, so in such cases,
The lift cylinder 8 must be isolated from the vibration suppressor 20, but on the other hand, it is desirable that the lift cylinder 8 be in communication with the vibration suppressor 20 when the vehicle is running.
そのため、リフトシリンダ8の負荷側であるヘッド側油
室8aに通じる管路15aと振動抑制装置20とを連通
ずる分岐管路16の途中に開閉弁】7を介在させ、運転
席付近に設けたスイッチ6を選択的に操作していた。Therefore, an on-off valve [7] is interposed in the middle of a branch pipe 16 that communicates a pipe 15a leading to the head side oil chamber 8a, which is the load side of the lift cylinder 8, and the vibration suppressor 20, and is installed near the driver's seat. Switch 6 was being operated selectively.
発明が解決しようとする課題
作業時の掘削・移動・積込み・移動など、一連の動作中
では、少なくとも2回、また、移動距離が長くなったり
、走行路面、障害物の状況によっては更に回数を重ねて
、リフトシリンダと振動抑制装置との連通の開閉操作は
頻繁になる。このときの状況を具体的に記述するに、作
業装置7のバケットに土砂を積込むときは、スイッチ6
を開路し、開閉弁17は第3図のA位置にしであるので
、管路15aと振動抑制装置20とは遮断されている。Problems to be Solved by the Invention During a series of operations such as digging, moving, loading, and moving during work, it must be carried out at least twice, and more times depending on the distance traveled, the road surface, and obstacles. Moreover, the opening and closing operations of the communication between the lift cylinder and the vibration suppression device become frequent. To specifically describe the situation at this time, when loading earth and sand into the bucket of the work device 7, switch 6
Since the circuit is opened and the on-off valve 17 is in position A in FIG. 3, the pipe line 15a and the vibration suppressing device 20 are cut off.
この状態でバケットに土砂を積込み作業装置7を上昇さ
せると、リフトシリンダ8のヘッド側油室8aの回路圧
は、バケットの負荷に比例して高圧となる1次いで、土
砂の掘削動作を全て完了し、移動のため走行を開始する
に当り、走行中の振動抑制のため、スイッチ6を閉路し
振動抑制装置20と管路15aとを連通させると、アキ
ュムレータ19には管路15aの圧力まで蓄圧されてい
ないので、リフトシリンダ8のヘッド側油室8aの圧油
の一部は管路15a、分岐管路16、開閉弁17のB位
置通路、スローリターン弁18を通りアキュムレータ1
9に流入するので作業装置7は車両本体に対し降下する
。また、次いで移動をしたのち、所定の場所で土砂をダ
ンプするときは、車両のゆれを防止するため、スイ、チ
ロを再び開路して管路15aと振動抑制装置20との連
通を遮断し、ダンプシリンダ9を作動してバケットの土
砂を放出する。その結果、作業装置7の負荷は減少し、
管路15aの圧力はそれに伴ない低下する。この状態か
ら車両の移動を開始するのであるが、走行中、車両の振
動抑制のため、スイッチ6を閉路し、リフトシリンダ8
と振動抑制回路20を連通させると、アキエムレータ1
9には、土砂満載時の負荷に相当するヘッド側油室8a
の高圧がそのまま蓄圧されているため、開閉弁17がB
位置へ切換った瞬間に蓄圧されていた圧油の一部がリフ
トシリンダ8のヘッド側油室8aに流入し、作業装置7
を車両本体に対して上昇せしめる結果となる。In this state, when the bucket is loaded with earth and sand and the working device 7 is raised, the circuit pressure in the head side oil chamber 8a of the lift cylinder 8 becomes high in proportion to the load on the bucket.Then, all earth and sand excavation operations are completed. When the switch 6 is closed to connect the vibration suppression device 20 and the conduit 15a to start traveling, the pressure is accumulated in the accumulator 19 up to the pressure of the conduit 15a. Therefore, a part of the pressure oil in the head-side oil chamber 8a of the lift cylinder 8 passes through the pipe 15a, the branch pipe 16, the B position passage of the on-off valve 17, and the slow return valve 18 to the accumulator 1.
9, the working device 7 is lowered relative to the vehicle body. In addition, when dumping earth and sand at a predetermined location after the next move, in order to prevent the vehicle from shaking, the switch and chiro are opened again to cut off communication between the conduit 15a and the vibration suppression device 20. The dump cylinder 9 is operated to discharge the earth and sand from the bucket. As a result, the load on the working device 7 is reduced,
The pressure in the pipe line 15a decreases accordingly. The vehicle begins to move from this state, but in order to suppress vehicle vibration while driving, switch 6 is closed and lift cylinder 8 is closed.
When the vibration suppression circuit 20 is communicated with the
9 is a head side oil chamber 8a corresponding to the load when fully loaded with earth and sand.
Since the high pressure of B remains unchanged, the on-off valve 17 is
A part of the pressure oil that had been accumulated at the moment of switching to the position flows into the head side oil chamber 8a of the lift cylinder 8, and the working device 7
This results in the vehicle being raised relative to the vehicle body.
このように、開閉弁17がB位置に切換わる都度、運転
者の意志に反して作業装置7が僅かに上下回動じ、作業
中に要求される正確なパケット位置を保持することが困
難となり、迅速・安全作業の妨げとなる。In this way, each time the on-off valve 17 is switched to the B position, the working device 7 moves slightly up and down against the driver's will, making it difficult to maintain the accurate packet position required during work. This impedes speedy and safe work.
この発明は、かかる問題点に鑑み、振動抑制回路状態に
切換えるときには、リフトシリンダのヘッド側油室の圧
力とアキュムレータの蓄圧力とが常に、同一に保持され
、作業装置が車両本体に対し、無用の上下回動をしない
ようにする安定回路を安価に提供しようとするものであ
る。In view of this problem, the present invention has been developed so that when switching to the vibration suppression circuit state, the pressure in the head side oil chamber of the lift cylinder and the accumulated pressure in the accumulator are always maintained at the same level, so that the working device is useless against the vehicle body. The aim is to provide a stabilizing circuit that prevents vertical fluctuations at low cost.
課題を解決するための手段
上記課題を解決するため、この発明は次のような手段を
講する。すなわち、
イ、振動抑制装置と作業装置用のリフトシリンダの負荷
側油室とを接続する管路の途中に、外部からの電気信号
により開路する開閉弁と、口、油圧ポンプと作業装置用
の油圧切換弁とを接続する管路の途中にあって、信号に
より切換わり、油圧ポンプの吐出圧油を作業装置用油圧
切換弁に供給したり、振動抑制装置に直接、該装置内の
アキュムレータに所定の蓄圧がなされるまで供給したり
する第1切換弁と、
ハ、外部からの電気信号により、上記第1切換弁の一方
の受信部がタンクに通じる管路を、リフトシリンダの負
荷側油室に通じる管路に接続損えせしめる第2切換弁と
、
二、振動抑制装置に通じる管路の圧力が、リフトシリン
ダの、負荷側圧力におおむね等しいか、それ以上になる
と、リミットスイッチを作動させる例えばスイッチシリ
ンダの如き手段と、をそれぞれ備え、
ホ、開閉弁の受信部には、スイッチとスイッチシリンダ
で作動するリミットスイッチの作動により閉路し“、か
つ、閉路状態の保持機能を有するメーク接点を介して電
源を接続し、
へ、第2切換弁の受信部には、上記スイッチを経て、上
記メーク接点が作動すると同時に開路するブレーク接点
を介して電源を接続する。Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. In other words, in the middle of the pipe connecting the vibration suppression device and the load-side oil chamber of the lift cylinder for the work equipment, there is an on-off valve that opens in response to an external electric signal, a port, a hydraulic pump, and a valve for the work equipment. It is located in the middle of the pipeline that connects the hydraulic switching valve, and is switched by a signal to supply the pressure oil discharged from the hydraulic pump to the hydraulic switching valve for working equipment, directly to the vibration suppression device, or to the accumulator in the equipment. A first switching valve that supplies oil until a predetermined pressure is accumulated; and (3) A receiving part of one of the first switching valves connects the load side oil of the lift cylinder to the tank by an electric signal from the outside. a second switching valve that causes a connection failure to the pipe line leading to the chamber; and two, a limit switch that operates when the pressure of the pipe line leading to the vibration suppression device becomes approximately equal to or higher than the load side pressure of the lift cylinder. E. The receiving part of the on-off valve has a make contact which is closed by the operation of a limit switch operated by the switch and the switch cylinder, and which has a function of maintaining the closed circuit state. A power source is connected to the receiving portion of the second switching valve through the switch and a break contact which opens at the same time as the make contact is activated.
作 用
作業装置をリフトシリンダで上昇させ走行を開始すると
き、スイッチを閉路すると、電源は該スイッチ、ブレー
ク接点を介して第2切換弁の受信部に作用して該弁は切
換わり、第1切換弁の一方の受信部に通じる管路を、リ
フトシリンダの負荷側油室に通じる管路に接続する。こ
のとき、リフトシリンダの負荷側油室の圧力が、第1切
換弁から振動抑制装置に通じる管路の圧力よりも高いと
きは、第1切換弁は油圧ポンプの吐出圧油が振動抑制装
置の方へ供給される側に切換わっているので、振動抑制
装置のアキエムレータに蓄圧され、ぞの圧力がリフトシ
リンダの負荷側圧力にほぼ等しくなると、スイッチシリ
ンダの作用で、リミットスイッチが働き、メーク接点は
閉路し、かつ、閉路状態を保持−するの゛で、開閉弁の
受信部には電源が引続いて供給され、リフトシリンダの
負荷側油室と振動抑制装置とは、管路および開閉弁を介
して連通ずる。このとき、リフトシリンダの負荷側油室
の圧力と振動抑制装置め圧力とは、おおむね等しくなっ
ているので、開閉弁が開路しても作業装置はその位置を
保つ。Operation When the work equipment is raised by the lift cylinder and starts traveling, when the switch is closed, the power source acts on the receiving part of the second switching valve through the switch and the break contact, and the valve is switched. A pipe line leading to one receiving portion of the switching valve is connected to a pipe line leading to the load side oil chamber of the lift cylinder. At this time, when the pressure in the load-side oil chamber of the lift cylinder is higher than the pressure in the pipeline leading from the first switching valve to the vibration suppression device, the first switching valve allows the discharge pressure oil of the hydraulic pump to reach the vibration suppression device. Since the pressure is switched to the side where the supply is supplied to the side, pressure is accumulated in the achi emulator of the vibration suppression device, and when the pressure on the other side becomes almost equal to the load side pressure of the lift cylinder, the limit switch is activated by the action of the switch cylinder, and the make contact is closed. The circuit is closed and maintained in the closed state, so power is continuously supplied to the receiving part of the on-off valve, and the load-side oil chamber of the lift cylinder and the vibration suppression device are connected to the pipe line and the on-off valve. communicate via. At this time, since the pressure in the load-side oil chamber of the lift cylinder and the pressure in the vibration suppressor are approximately equal, the working device maintains its position even if the on-off valve is opened.
なお、メーク接点が作動すると直ちにブレーク接点が開
路して第2切換弁の作動は停止するので第19]換弁の
一方の受信部に通じる管路は、タンクに接続するので該
弁は切換り、油圧ポンプの吐出圧油は作業装置用の油圧
切換弁へと流入してゆく。In addition, as soon as the make contact is activated, the break contact is opened and the operation of the second switching valve is stopped, so the pipe line leading to one receiving part of the switching valve is connected to the tank, so the valve is switched, The pressure oil discharged from the hydraulic pump flows into the hydraulic switching valve for the working equipment.
かくして、走行中の車体の振動抑制効果が得られ、更に
作業装置の操作をすることも可能であるのは勿論である
が、開閉弁の作動時においても作業装置が不用意に下降
することはない。In this way, it is possible to obtain the effect of suppressing the vibration of the vehicle body while driving, and it is also possible to operate the working equipment, but it also prevents the working equipment from inadvertently descending even when the on-off valve is activated. do not have.
次に、主として掘削、掬込み、放出などの動作をすると
きは、振動抑制装置を作用させない方が確実で安全な操
作ができるが、このときはスイッチを開路しておくこと
により、リフトシリンダの負荷側油室と振動抑制装置と
は開閉弁で遮断されるので、作業装置の強力で確実な作
動が実現する。Next, when performing operations such as excavating, scooping, and discharging, it is more reliable and safe to operate without the vibration suppressor, but in this case, by leaving the switch open, the lift cylinder Since the load-side oil chamber and the vibration suppression device are isolated by an on-off valve, powerful and reliable operation of the work equipment is achieved.
なお、このとき、第2切換弁は第1切換弁の一方の受信
部に通じる管路をタンクに通じさせているので、油圧ポ
ンプの吐出圧油は、第1切換弁を介して、全量、作業装
置用の油圧切換弁に向は流入する。At this time, since the second switching valve connects the pipe line leading to one of the receiving parts of the first switching valve to the tank, the entire amount of pressure oil discharged from the hydraulic pump is transferred through the first switching valve. Direction flows into the hydraulic switching valve for the working equipment.
実施例 この発明の実施例を図に基づいて説明する。Example Embodiments of this invention will be described based on the drawings.
第1図は車輪式建設機械の代表例としての車輪式トラク
タショベルに、通常の振動抑制装置と本発明にかかる走
行振動抑制安定回路とを設けたときの電気・油圧系統図
である。FIG. 1 is an electrical/hydraulic system diagram when a wheeled tractor excavator, which is a typical example of a wheeled construction machine, is equipped with a normal vibration suppression device and a running vibration suppression stabilization circuit according to the present invention.
図において、8,9は作業装置用のリフトシリンダ、ダ
ンプシリンダ、10はタンク、11は油圧パワーユニッ
ト中の作業装置などの作動用油圧ポンプ、12はダンプ
シリンダ9用の油圧切換弁であり、該油圧切埠弁12に
管路14a、14bを介してダンプシリンダ9のヘッド
側油室9a、ロッド側油室9bが接続され、13はリフ
トシリンダ8用の油圧切換弁であり、該油圧切換弁13
に管路15a、15bを介してリフトシリンダ8のヘッ
ド側油室8a、ロッド側油室8bが接続しである。さら
に、リフトシリンダ8において、作業装置による負荷側
の油室、すなわちヘッド側油室8aに接続された管路1
5aの途中に分岐管路16を設け、この分岐管路16は
、開閉弁17を介して絞り弁18aとチエツク弁18b
とからなるスローリターン弁18に接続し、このスロー
リターン弁18は、更に、アキュムレータ19に接続し
である。上記の開閉弁17は、常時は内蔵のばねの付勢
力により、分岐管路16を閉路しており、その受信部に
電気信号が入力されると開路して分岐管路16を、スロ
ーリターン弁18とアキエムレータ19とからなる振動
抑制装置20に連通させるようになっている。また、ア
キュムレータ19としては通常プラグ形アキュムレータ
が用いられ、負荷の大小、作業条件、設置空間などの関
係から単数または複数としたり、或いは、開閉弁17、
振動抑制値!20を含めて単数または複数など各種組合
わせて使用されることもありうる。In the figure, 8 and 9 are lift cylinders and dump cylinders for working equipment, 10 is a tank, 11 is a hydraulic pump for operating the working equipment in the hydraulic power unit, and 12 is a hydraulic switching valve for the dump cylinder 9. A head-side oil chamber 9a and a rod-side oil chamber 9b of the dump cylinder 9 are connected to the hydraulic cut-off valve 12 via pipes 14a and 14b, and 13 is a hydraulic switching valve for the lift cylinder 8; 13
A head side oil chamber 8a and a rod side oil chamber 8b of the lift cylinder 8 are connected to each other via pipes 15a and 15b. Further, in the lift cylinder 8, a pipe line 1 connected to the oil chamber on the load side by the working device, that is, the head side oil chamber 8a.
A branch pipe line 16 is provided in the middle of the pipe 5a, and this branch pipe line 16 is connected to a throttle valve 18a and a check valve 18b via an on-off valve 17.
The slow return valve 18 is further connected to an accumulator 19. The above-mentioned on-off valve 17 normally closes the branch pipe 16 by the biasing force of a built-in spring, and when an electric signal is input to its receiving section, it opens and closes the branch pipe 16 as a slow return valve. 18 and a vibration suppressor 20 consisting of an Akiemulator 19. Further, as the accumulator 19, a plug type accumulator is usually used, and depending on the load size, working conditions, installation space, etc., one or more may be used, or the on-off valve 17,
Vibration suppression value! It may be used in various combinations such as singular or plural including 20.
なお、21はメインリリーフ弁、22,23゜24はそ
れぞれ管路14a 、 14b 、 15aに連通
する回路のオーバロードリリーフ弁、25.26.27
.28はキャビテーション防止用のチエツク弁である。In addition, 21 is a main relief valve, 22, 23, and 24 are overload relief valves of the circuits communicating with the pipes 14a, 14b, and 15a, respectively, 25.26.27
.. 28 is a check valve for preventing cavitation.
また、図の1はメーク接点2、ブレーク接点3、電源開
閉用のスイッチ6などを有するリレー回路で、メーク接
点2は、常時は開路しているが、スイッチ6が閉路状態
の下で、リミットスイッチ5により電線39力に一度閉
路されると開閉弁17の受信部に通じる電線40に電源
を引続き供給し、スイッチ6を開路しない限り、この状
態を保持し、ブレーク接点3は、常時は閉路しているが
、リミットスイッチ5の開閉に関係なく、電線40が通
電状態の間は開路するようになっている既知技術の電気
回路であり、4はヘッド側油室4aとスプリングを内蔵
したロッド側油室4bとを備えたスイッチシリンダで、
常時はスプリングの付勢力で収縮しているが、油室4a
の圧力が上昇してゆき、油室4bの圧力に略々等しくな
ると伸長し、そのロンドの先端部がリミットスイッチ5
の作動子に作用して、該リミットスイッチ5の内部電気
回路を閉路するようにしであるとともに、上記ヘッド側
油室4aには、前述の開閉弁17と振動抑制装置1E2
0とを接続する管路から分岐した管路33を、管路34
を介して導き、ロッド側油室4bには、管路15aを延
長した管路35が導いである。In addition, 1 in the figure is a relay circuit that has a make contact 2, a break contact 3, a switch 6 for opening and closing the power supply, etc. The make contact 2 is normally open, but when the switch 6 is closed, the limit is reached. Once the electric wire 39 is closed by the switch 5, power is continuously supplied to the electric wire 40 leading to the receiving part of the on-off valve 17, and this state is maintained unless the switch 6 is opened, and the break contact 3 is normally closed. However, it is an electrical circuit of known technology that is designed to be open while the electric wire 40 is energized regardless of whether the limit switch 5 is opened or closed, and 4 is a rod containing a head side oil chamber 4a and a spring. A switch cylinder equipped with a side oil chamber 4b,
Although it is normally contracted by the biasing force of the spring, the oil chamber 4a
As the pressure increases, and when it becomes approximately equal to the pressure in the oil chamber 4b, it expands, and the tip of the iron reaches the limit switch 5.
The above-mentioned on-off valve 17 and the vibration suppressor 1E2 are arranged in the head side oil chamber 4a to close the internal electric circuit of the limit switch 5.
The pipe line 33 branched from the pipe line connecting to the pipe line 34
A conduit 35, which is an extension of the conduit 15a, leads to the rod-side oil chamber 4b.
さらに、油圧ポンプ11の圧油が油圧切換弁12.13
からなる油圧切換弁群に流入する管路32の途中には、
管路37に発生する信号圧によりC位置に、または管路
41に発生する信号圧によりD位置に切換る第1切換弁
30を設けてあり、この第1切換弁30がC位置にある
ときは、油圧ポンプ11の吐出圧油はチエツク弁29を
介して管路33へ、D位置に切換ると、管路33への通
路は遮断され、管路32へと導かれるようになっており
、管路37.41内の圧力がおおむね等しいときは、該
弁はC位置を保持する。Furthermore, the pressure oil of the hydraulic pump 11 is
In the middle of the pipe line 32 flowing into the hydraulic switching valve group consisting of
A first switching valve 30 is provided which switches to the C position by the signal pressure generated in the conduit 37 or to the D position by the signal pressure generated in the conduit 41, and when the first switching valve 30 is in the C position The pressure oil discharged from the hydraulic pump 11 is directed to the pipe line 33 via the check valve 29, and when the position is switched to the D position, the passage to the pipe line 33 is blocked and the oil is guided to the pipe line 32. , the valve remains in the C position when the pressures in lines 37, 41 are approximately equal.
31は電磁式の第2切換弁であり、その受信部には、ブ
レーク接点3を経由して電源に通じる電線38が導いて
あり、常時はばねの付勢力によりE位置にあって管路3
7をタンク10に通じさせているが、励磁されるとF位
置に切換わり、管路37を管路35から分岐した管路3
6に通じさせる。Reference numeral 31 designates a second electromagnetic switching valve, and an electric wire 38 leading to the power supply via the break contact 3 is led to the receiving part of the valve.
7 is connected to the tank 10, but when it is energized, it is switched to the F position, and the pipe 37 is branched from the pipe 35.
6.
次に、以上の構成からなるこの発明の作動について説明
する。Next, the operation of the present invention having the above configuration will be explained.
車輪式トラクタショベルを停止、または、超低速走行の
下に土砂の掘削、掬込み、作業装置の上昇、下降などの
作動をするときは、スイッチ6を開路したまま油圧切換
弁12.13を操作して所要の動作をなさしめるのであ
るが、このときは、開閉弁17、第2切換弁31は何れ
も励磁されないので、開閉弁17はA位置にあり分岐管
路16と振動抑制装置20との連通を遮断し、第2切換
弁31はE位置にあって管路37をタンク10に通じさ
せている。一方、油圧ポンプ11は既に作動し、その吐
出圧油は第1切換弁30のC位置通路、チエツク弁29
、管路33、スローリターン弁18を通りアキュムレー
タ19に流入するが、有限の容積であるから直ちに充満
し、管路33の圧力は上昇し、同時に管路41の圧力も
管路37のそれよりも高(なり、その結果第1切換弁3
0はスプリングの付勢力に抗してD位置に切換えられ、
その位置を保持し、油圧ポンプ11の吐出圧油は第1切
換弁30のD位置通路、管路32を経て油圧切換弁12
.13に流入し、該切換弁を操作することにより、リフ
トシリンダ8、ダンプシリンダ9を伸縮させる。従って
、この状態下では、作業装置7は、リフトシリンダ8に
より車両本体に対して確実に支持され、通常の機械と同
様、油圧切換弁12.13の操作に従い、正確な作動を
行う。When stopping the wheeled tractor excavator, or when operating the excavation and scooping of earth and sand, raising and lowering the working equipment while running at extremely low speed, operate the hydraulic selector valves 12 and 13 with the switch 6 open. At this time, neither the on-off valve 17 nor the second switching valve 31 is energized, so the on-off valve 17 is in the A position, and the branch pipe 16 and the vibration suppressor 20 are connected to each other. The second switching valve 31 is in the E position and allows the pipe line 37 to communicate with the tank 10. On the other hand, the hydraulic pump 11 is already in operation, and its discharge pressure oil is sent to the C position passage of the first switching valve 30 and the check valve 29.
, the pipe 33 and the slow return valve 18 to flow into the accumulator 19, but since it has a finite volume, it immediately fills up, and the pressure in the pipe 33 rises, and at the same time the pressure in the pipe 41 also becomes higher than that in the pipe 37. is also high (as a result, the first switching valve 3
0 is switched to the D position against the urging force of the spring,
While maintaining that position, the discharge pressure oil of the hydraulic pump 11 is passed through the D position passage of the first switching valve 30 and the pipe 32 to the hydraulic switching valve 12.
.. 13, and by operating the switching valve, the lift cylinder 8 and dump cylinder 9 are expanded and contracted. Therefore, under this condition, the working device 7 is reliably supported with respect to the vehicle body by the lift cylinder 8, and performs accurate operation in accordance with the operation of the hydraulic switching valves 12, 13, like a normal machine.
パケットに土砂の掬込みを完了し、起伏のある運搬路上
の走行開始に当っては、先づスイ・ノチ6を閉路した上
で油圧切換弁12.13を操作して走行姿勢を整える。After completing the scooping of earth and sand into the packet, when starting to travel on the undulating transport road, first close the sui-nochi 6 and then operate the hydraulic switching valves 12 and 13 to adjust the travel attitude.
この間において、電源はスイッチ6、ブレーク接点3、
電線38を通り、第2切換弁31の受信部に作用するの
で、咳弁はE位置からF位置に切換り、それまでタンク
10に通じていた管路37を管路36に通じさせ、るの
で、第1切換弁30は管路37、すなわち管路16aの
圧力が管路41、すなわちアキュムレータ19の圧力よ
りも高いときはC位置を保持するが、油圧ポンプ11の
吐出圧油が管路33を経てアキュムレータ19に流入し
て蓄圧され、それにつれて管路41の圧力が管路37の
それ以上になるとD位置に切換ねり、油圧ポンプ11の
吐出圧油は管路32を通り、油圧切換弁12.13へ流
入する。During this time, the power supply is switched to switch 6, break contact 3,
It passes through the electric wire 38 and acts on the receiving part of the second switching valve 31, so that the cough valve is switched from the E position to the F position, causing the pipe 37 that was previously connected to the tank 10 to be connected to the pipe 36, and Therefore, the first switching valve 30 maintains the C position when the pressure in the pipe 37, that is, the pipe 16a is higher than the pressure in the pipe 41, that is, the accumulator 19, but the pressure oil discharged from the hydraulic pump 11 is 33, it flows into the accumulator 19 and the pressure is accumulated, and as the pressure in the pipe line 41 becomes higher than that in the pipe line 37, the pressure oil is switched to the D position, and the pressure oil discharged from the hydraulic pump 11 passes through the pipe line 32, and the pressure oil is switched to the D position. Flow into valve 12.13.
一方、スイッチシリンダ4のヘッド側油室4aに通じる
管路34は同時にアキュムレータ19の圧力に等しく、
ロンド側油室4bに通じる管路35はリフトシリンダ8
の負荷側であるヘッド側油室8aの圧力に等しく、上述
した油圧ポンプ11の吐−出圧油によりヘッド側油室4
aの圧力が次第に上昇してロンド側油室4bの圧力にほ
ぼ等しく、またはそれ以上になると、スイッチシリンダ
4は内蔵のスプリングの付勢力に抗して伸長し、そのロ
ンド先端はリミットスイッチ5の作動子に作用して、該
リミットスイッチ5の内部電気回路を閉路するので、電
線39は短絡状態となる。それにともない、スイッチ6
を通った電源は、リミットスイッチ5を経由してメーク
接点2を励磁するので、該メーク接点2は閉路し、これ
に連なる電線40を経て、開閉弁17の受信部に電源が
接続されるので該開閉弁17はA位置からB位置に切換
ねり、管路16は開閉弁17、スローリターン弁18を
介してアキュムレータ19に連通し、振動抑制効果を発
揮するのであるが、開閉弁17が切換わる時は、上述し
た如く、油室8aとアキュムレータ19との圧力が、お
おむね同一となっているので作業装置7が一時的に下降
することはない。On the other hand, the pressure of the pipe line 34 leading to the head side oil chamber 4a of the switch cylinder 4 is equal to the pressure of the accumulator 19,
A pipe line 35 leading to the rond side oil chamber 4b is connected to the lift cylinder 8.
The head side oil chamber 4 is equal to the pressure of the head side oil chamber 8a, which is the load side of
When the pressure in a gradually increases and becomes almost equal to or higher than the pressure in the rond side oil chamber 4b, the switch cylinder 4 expands against the biasing force of the built-in spring, and the rond tip touches the limit switch 5. Since it acts on the actuator to close the internal electric circuit of the limit switch 5, the electric wire 39 becomes short-circuited. Along with this, switch 6
The power passing through excites the make contact 2 via the limit switch 5, so the make contact 2 is closed, and the power is connected to the receiving part of the on-off valve 17 via the electric wire 40 connected thereto. The on-off valve 17 switches from the A position to the B position, and the pipe line 16 communicates with the accumulator 19 via the on-off valve 17 and the slow return valve 18 to exert a vibration suppressing effect. When changing, as described above, the pressures in the oil chamber 8a and the accumulator 19 are approximately the same, so the working device 7 does not temporarily lower.
なお、メーク接点2が閉路状態となり電線40に電源が
供給され始めると、リミットスイッチ5の開閉には関係
なく、該メーク接点2には保持機能が与えられているの
で、スイッチ6を開路しない限り閉路状態を続け、また
、電線40に電源が供給されるとブレーク接点3は開路
し、第2切換弁31は励磁されなくなるので、該弁は元
のE位置に切換るため、第1切換弁30は、管路33に
負荷圧がある限りD位置を保持し、作業装置の作動にも
支障を来すことはない。Note that once the make contact 2 is in a closed state and power begins to be supplied to the electric wire 40, the make contact 2 is given a holding function, regardless of whether the limit switch 5 is opened or closed, so unless the switch 6 is opened, When the closed circuit state continues and power is supplied to the electric wire 40, the break contact 3 opens and the second switching valve 31 is no longer energized, so the valve switches to the original E position, so the first switching valve 30 maintains the D position as long as there is load pressure in the pipe line 33, and does not interfere with the operation of the working device.
以上の作動を要約すると、スイッチ6を開路のまま、こ
の機械を運転するときは、走行振動抑制装置は作動せず
従来からの標準的な性能を発揮する。また、スイッチ6
を閉路すると、そのときの振動抑制装置のアキュムレー
タの内圧が、リフトシリンダの負荷側圧力よりも低いと
きは、自動的に、油圧ポンプの吐出圧油により、先づ、
アキュムレータに蓄圧をし、それら側圧力がおおむね同
圧にしたうえで、リフトシリンダの負荷側油室と振動抑
制装置とを接続させる。To summarize the above operation, when this machine is operated with the switch 6 open, the running vibration suppression device does not operate and the conventional standard performance is exhibited. Also, switch 6
When the circuit is closed, if the internal pressure of the accumulator of the vibration suppression device is lower than the load side pressure of the lift cylinder, the discharge pressure oil of the hydraulic pump automatically closes the
After accumulating pressure in the accumulator and making the pressures on both sides approximately the same, the load side oil chamber of the lift cylinder and the vibration suppression device are connected.
発明の効果
車輪式建設機械に備える油圧的手段の走行振動抑制回路
に、この発明にかかる安定回路を併設しておくと、通常
の作業状態の油圧回路から振動抑制効果を発揮する回路
に切換えようとするとき、先行して、自動的に、作業装
置支持用油圧シリンダの油室の油圧と振動抑制回路中の
アキュムレータに蓄圧される油圧とがおおむね同一とな
るため、切換時において作業装置が上下に揺動すること
はなく、また、アキュムレータの蓄圧圧力は自動的に作
業対称物を含む作業装置の重量に応じて対応するので、
特別な操作をも要せず、安全で安定した作業ができる。Effects of the Invention If the stability circuit according to the present invention is added to the running vibration suppression circuit of the hydraulic means provided in a wheeled construction machine, it will be possible to switch from the hydraulic circuit in normal working conditions to a circuit that exerts a vibration suppression effect. When switching, the hydraulic pressure in the oil chamber of the hydraulic cylinder for supporting the working equipment and the hydraulic pressure accumulated in the accumulator in the vibration suppression circuit automatically become approximately the same, so that the working equipment does not move up or down at the time of switching. In addition, the accumulator's accumulated pressure automatically corresponds to the weight of the work equipment including the object to be worked on.
No special operations are required, allowing safe and stable work.
第1図はこの発明の実施例を示す電気・油圧系統図、第
2図は車輪式トラクタショベルの外観側面図、第3図は
車輪式トラクタショベルに設けられる従来の走行振動抑
制装置の要部電気・油圧系統図である。
1・・・・・・・・ リレー回路
2・・・・・・・・メーク接点
3・・・・・・・・ブレーク接点
4・・・・・・・・ スイッチシリンダ5・・・・・・
・・ リミットスイッチ17・・・・・・・・開閉弁
20・・・・・・・・振動抑制装置
30・・・・・・・・第1切換弁
31・・・・・・・・第2切換弁
以上Fig. 1 is an electrical/hydraulic system diagram showing an embodiment of the present invention, Fig. 2 is an external side view of a wheeled tractor excavator, and Fig. 3 is a main part of a conventional running vibration suppression device installed in a wheeled tractor excavator. This is an electrical/hydraulic system diagram. 1... Relay circuit 2... Make contact 3... Break contact 4... Switch cylinder 5...・
... Limit switch 17 ...... Opening/closing valve 20 ...... Vibration suppressor 30 ...... First switching valve 31 ...... First 2 switching valves or more
Claims (1)
シリンダで支持する如き車輪式建設機械であって、上記
リフトシリンダの負荷側油室に通じる管路を、受信部に
信号が入力されると開路する開閉弁を介して振動抑制装
置に接続させた油圧的走行振動抑制回路において、各種
油圧アクチュエータなどの作動用油圧ポンプの吐出側管
路の途中に設け、信号により切換り、圧油をアクチュエ
ータ作動用油圧切換弁に供給したり、振動抑制装置に直
接、該装置内のアキュムレータに所定の蓄圧がなされる
まで供給したりする第1切換弁と、外部からの電気信号
により、上記第1切換弁が振動抑制装置に圧油を供給す
る側に切換わる信号を発する第2切換弁と、振動抑制装
置に通じる管路の圧力が、リフトシリンダの負荷圧力に
おおむね等しいか、それ以上になるとリミットスイッチ
を作動させる手段とを備え、開閉弁の受信部には、スイ
ッチとリミットスイッチの作動により閉路し、かつ、保
持機能を有するメーク接点を介して電源を接続し、第2
切換弁の受信部には、上記スイッチと、メーク接点が作
動すると同時に開路するブレーク接点とを介して電源を
接続したことを特長とする車輪式建設機械の走行振動抑
制安定回路。In a wheel-type construction machine in which a base end of a working equipment support member is pivotally supported on a vehicle body and supported by a lift cylinder, a signal is input to a receiving unit through a conduit leading to a load-side oil chamber of the lift cylinder. In a hydraulic running vibration suppression circuit connected to a vibration suppression device via an on-off valve that opens when The first switching valve supplies oil to the hydraulic switching valve for operating the actuator, or directly to the vibration suppression device until a predetermined pressure is accumulated in the accumulator in the device, and an electric signal from the outside. The first switching valve issues a signal to switch to the side that supplies pressure oil to the vibration suppression device, and the pressure in the pipe line leading to the vibration suppression device is approximately equal to or higher than the load pressure of the lift cylinder. When the limit switch is activated, the receiving part of the on-off valve is connected to a power source via a make contact which closes when the switch and the limit switch are activated and has a holding function.
A running vibration suppressing and stabilizing circuit for a wheeled construction machine, characterized in that a power source is connected to a receiving part of the switching valve via the switch and a break contact that opens at the same time as the make contact is activated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20118688A JP2724469B2 (en) | 1988-08-11 | 1988-08-11 | Running vibration suppression and stabilization circuit for wheeled construction machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20118688A JP2724469B2 (en) | 1988-08-11 | 1988-08-11 | Running vibration suppression and stabilization circuit for wheeled construction machines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0253623A true JPH0253623A (en) | 1990-02-22 |
JP2724469B2 JP2724469B2 (en) | 1998-03-09 |
Family
ID=16436774
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20118688A Expired - Lifetime JP2724469B2 (en) | 1988-08-11 | 1988-08-11 | Running vibration suppression and stabilization circuit for wheeled construction machines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2724469B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5690159A (en) * | 1995-09-07 | 1997-11-25 | Ryobi Ltd. | Casting apparatus and casting method for producing cylinder block |
-
1988
- 1988-08-11 JP JP20118688A patent/JP2724469B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5690159A (en) * | 1995-09-07 | 1997-11-25 | Ryobi Ltd. | Casting apparatus and casting method for producing cylinder block |
Also Published As
Publication number | Publication date |
---|---|
JP2724469B2 (en) | 1998-03-09 |
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