JP2002004339A - Control circuit for hydraulic backhoe - Google Patents
Control circuit for hydraulic backhoeInfo
- Publication number
- JP2002004339A JP2002004339A JP2000188353A JP2000188353A JP2002004339A JP 2002004339 A JP2002004339 A JP 2002004339A JP 2000188353 A JP2000188353 A JP 2000188353A JP 2000188353 A JP2000188353 A JP 2000188353A JP 2002004339 A JP2002004339 A JP 2002004339A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pilot
- speed
- boom
- bucket
- 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
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、油圧ショベルの
制御回路、特にブーム、アーム及びバケットを複合操作
する場合の油圧回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for a hydraulic shovel, and more particularly to a hydraulic circuit for a combined operation of a boom, an arm and a bucket.
【０００２】[0002]
【従来技術】従来は、図４に示すように押し付け掘削時
にはアームと旋回を同時操作する場合でも旋回を確保で
きるようにパラレル油路８’に旋回可変優先弁９’を設
け、該旋回可変優先弁９’のパイロット制御部９ａ’に
旋回パイロット弁１１’のパイロット圧を導出し、パラ
レル油路８’を絞ることにより旋回力を確保していた。
また、高速の床掘時にアーム閉じ速度を確保するためブ
ーム用方向制御弁２’でセンターバイパス油路３０’が
遮断されることによりパラレル油路８’から圧油の供給
が十分行われるように旋回可変優先弁９’の油路開放側
ポジション９ｄ’のパイロット制御部９ｂ’にブーム用
パイロット弁１３’のパイロット圧を作用させている。
しかし、この図４に示す従来の油圧回路ではバケット閉
じ、アーム閉じ及びブーム上げを同時操作した場合で特
殊アタッチメントの重量Ｗがバケットより重い場合はア
ーム及びバケットの駆動圧が低圧となり、ブーム用方向
制御弁２’、１９’がパラレル油路８’、２４’で夫々
アーム用方向制御弁４’、２１’及びバケット用方向制
御弁２０’に接続されているため回路圧がブーム上げの
圧まで上昇せず、ブームが上がらないという不具合が生
じた。2. Description of the Related Art Conventionally, as shown in FIG. 4, a swing variable priority valve 9 'is provided in a parallel oil passage 8' so that a swing can be secured even when an arm and a swing are simultaneously operated at the time of pressing excavation. The pilot pressure of the turning pilot valve 11 'is derived to the pilot control unit 9a' of the valve 9 ', and the turning force is secured by narrowing the parallel oil passage 8'.
Also, in order to secure the arm closing speed at the time of high-speed excavation, the center bypass oil passage 30 'is shut off by the boom directional control valve 2' so that the pressure oil is sufficiently supplied from the parallel oil passage 8 '. The pilot pressure of the boom pilot valve 13 'is applied to the pilot control unit 9b' at the oil passage open side position 9d 'of the turning variable priority valve 9'.
However, in the conventional hydraulic circuit shown in FIG. 4, when the weight of the special attachment is heavier than the bucket when the bucket is closed, the arm is closed, and the boom is raised at the same time, the driving pressure of the arm and the bucket becomes low and the boom direction is reduced. Since the control valves 2 'and 19' are connected to the arm direction control valves 4 'and 21' and the bucket direction control valve 20 'through parallel oil passages 8' and 24 ', respectively, the circuit pressure is increased to the boom raising pressure. There was a problem that the boom did not rise and did not rise.
【０００３】一方、図５に示す従来の油圧回路において
押し付け掘削をする場合は、図示していないアーム閉じ
パイロット圧、旋回パイロット圧及び主油圧ポンプ１の
吐出圧を圧力センサで検出し、これを制御装置で判断す
ることで電磁方向切換弁２６’を切り換え、パラレル油
路８’の旋回可変優先弁９’のパイロット制御部９ａ’
にパイロットポンプ２７’からのパイロット圧を作用さ
せ、パラレル油路８’を絞ることにより、旋回力を確保
している。この図５に示す従来の油圧回路においては、
先に説明した図４における不具合、すなわち、バケット
閉じ、アーム閉じ及びブーム上げの同時操作時にブーム
が上がらないという不具合に対しては、図６に示すよう
にパラレル油路２４’からバケット用方向制御弁２０’
の入力ポートへの分岐油路３１’に絞り弁３２’及び該
絞り弁３２’のパイロット制御部３２ａ’にブーム上げ
パイロット圧を導出する方向切換弁３３’を配設し、ア
ーム閉じ、ブーム上げを同時操作した場合前記分岐回路
３１’を絞ることにより、ブーム上げの圧を確保し、ブ
ーム上げを可能としている。しかし、この図５及び図６
に示す従来の油圧回路においては、バケット用方向制御
弁２０’への圧油の供給は前記絞り弁３２’が介在する
分岐油路３１’からのみ行われるので、同時操作時のバ
ケット用方向制御弁２０’へ十分な圧油が供給されず、
バケットの動きが悪くなると共に、バルブの数が増えコ
ストが高くなるという問題点があった。[0005] On the other hand, when pressing and excavating in the conventional hydraulic circuit shown in FIG. 5, an arm closing pilot pressure, a turning pilot pressure and a discharge pressure of the main hydraulic pump 1 (not shown) are detected by a pressure sensor, and these are detected. The control device makes a decision to switch the electromagnetic direction switching valve 26 ', and the pilot control unit 9a' of the turning variable priority valve 9 'of the parallel oil passage 8'.
The pilot pressure from the pilot pump 27 'acts on the parallel oil passage 8' to narrow the parallel oil passage 8 ', thereby ensuring the turning force. In the conventional hydraulic circuit shown in FIG.
For the problem described above with reference to FIG. 4, that is, the problem that the boom does not rise during the simultaneous operation of closing the bucket, closing the arm, and raising the boom, the bucket direction control from the parallel oil passage 24 'as shown in FIG. Valve 20 '
A throttle valve 32 'is provided in a branch oil passage 31' to an input port of the throttle valve 32 ', and a directional control valve 33' for deriving a boom raising pilot pressure is provided in a pilot control section 32a 'of the throttle valve 32', and the arm is closed and the boom is raised. Is operated simultaneously, by narrowing the branch circuit 31 ', the pressure for raising the boom is secured and the boom can be raised. However, FIGS. 5 and 6
In the conventional hydraulic circuit shown in FIG. 1, since the supply of the pressure oil to the bucket direction control valve 20 'is performed only from the branch oil passage 31' interposed with the throttle valve 32 ', the bucket direction control during simultaneous operation is performed. Not enough pressure oil is supplied to valve 20 '
There was a problem that the movement of the bucket became worse, and the number of valves increased and the cost increased.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記事実に鑑
みなされたものであり、その目的はバケット閉じ、アー
ム閉じ及びブーム上げを同時操作する場合においても、
ブーム上げに必要な圧油を十分確保してブームの上げを
良くし、作業性を向上させることを課題とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its object the purpose of simultaneously operating the bucket closing, arm closing and boom raising.
An object of the present invention is to secure sufficient pressure oil necessary for raising the boom, improve the boom raising, and improve workability.
【０００５】[0005]
【課題を解決するための手段】上記課題を達成するた
め、本発明ではブーム２速、旋回及びアーム１速の各方
向制御弁を含み、該方向制御弁を夫々パラレル接続した
第１油圧回路とブーム１速、バケット及びアーム２速の
各方向制御弁を含み、該方向制御弁を夫々パラレル接続
した第２油圧回路から構成される油圧回路において、前
記第１油圧回路のパラレル油路の旋回用方向制御弁の下
流に旋回可変優先弁を設け、該旋回可変優先弁の一方の
パイロット制御部を旋回用パイロット弁に連通し、該旋
回可変優先弁の他方のパイロット制御部をバケット用パ
イロット弁からのパイロット圧により切り換えられる方
向切換弁を介してブーム用パイロット弁に連通したこ
と、また、前記第１油圧回路と第２油圧回路において、
前記第１油圧回路のパラレル油路の旋回用方向制御弁の
下流に旋回可変優先弁を設け、該旋回可変優先弁のパイ
ロット制御部をバケット用パイロット弁と所定の信号に
より切り換わる電磁切換弁を介してパイロットポンプに
夫々接続したこと、更に、前記第１油圧回路と第２油圧
回路において、前記第１油圧回路のパラレル油路の旋回
用方向制御弁の下流に旋回可変優先弁を設け、該旋回可
変優先弁のパイロット制御部を旋回用パイロット弁とバ
ケット用パイロット弁に夫々接続したことを特徴とす
る。In order to achieve the above object, the present invention includes a first hydraulic circuit which includes boom second speed, swing and arm first speed directional control valves, and the directional control valves are respectively connected in parallel. A hydraulic circuit including a boom first speed, a bucket, and an arm second speed directional control valve, and a second hydraulic circuit in which the directional control valves are connected in parallel, respectively, for turning a parallel oil passage of the first hydraulic circuit. A turning variable priority valve is provided downstream of the directional control valve, one of the pilot control units of the turning variable priority valve communicates with the turning pilot valve, and the other pilot control unit of the turning variable priority valve is connected to the bucket pilot valve. Communicating with a boom pilot valve via a direction switching valve switched by a pilot pressure of the first hydraulic circuit and the second hydraulic circuit,
A turning variable priority valve is provided downstream of the turning direction control valve in the parallel oil passage of the first hydraulic circuit, and an electromagnetic switching valve that switches a pilot control unit of the turning variable priority valve to a bucket pilot valve by a predetermined signal. Connected to a pilot pump via the first hydraulic circuit and the second hydraulic circuit, and a turning variable priority valve is provided downstream of the turning direction control valve in the parallel oil passage of the first hydraulic circuit. The pilot control unit of the turning variable priority valve is connected to the turning pilot valve and the bucket pilot valve, respectively.
【０００６】[0006]
【発明の実施の形態】以下本発明の実施形態を図１乃至
図３に基づいて説明する。図１は本発明の第１実施形態
に係る油圧回路図を示し、図２は本発明の第２実施形態
に係る油圧回路図を示し、図３は本発明の第３実施形態
に係る油圧回路図を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a hydraulic circuit diagram according to a first embodiment of the present invention, FIG. 2 shows a hydraulic circuit diagram according to a second embodiment of the present invention, and FIG. 3 shows a hydraulic circuit diagram according to a third embodiment of the present invention. The figure is shown.
【０００７】図１において、第１油圧回路は主油圧ポン
プ１、ブーム２速用方向制御弁２、旋回用方向制御弁３
及びアーム１速用方向制御弁４を含み、主油圧ポンプ１
とブーム２速用方向制御弁２は吐出油供給油路５で接続
され、ブーム２速用方向制御弁２と旋回用方向制御弁３
及び旋回用方向制御弁３とアーム１速用方向制御弁４は
夫々タンデム接続され、ブーム２速用方向制御弁２は２
本のブームシリンダ６、６と、旋回用方向制御弁３は図
示していない旋回モータと、アーム１速用方向制御弁４
はアームシリンダ７と夫々接続されている。そして、前
記吐出油供給油路５から分岐したパラレル油路８は旋回
用方向制御弁３及びアーム１速用方向制御弁４の入力ポ
ートに夫々接続され、該パラレル油路８の旋回用方向制
御弁３の下流でアーム１速用方向制御弁４の上流には旋
回可変優先弁９が介装されている。該旋回可変優先弁９
の一方のパイロット制御部９ａはシャトル弁１０を介し
て旋回用パイロット弁１１に接続され、該旋回可変優先
弁９の他方のパイロット制御部９ｂは方向切換弁１２の
Ａポートに接続され、方向切換弁１２のＰポートはブー
ム上げ用パイロット弁１３にパイロット油路１４により
接続され、該ブーム上げ用パイロット弁１３のパイロッ
ト圧が前記旋回可変優先弁９の他方のパイロット制御部
９ｂに作用した場合に該旋回可変優先弁９は油路解放側
ポジション９ｄに切り換えられる。また、前記ブーム上
げ用パイロット弁１３はブーム２速用方向制御弁２のパ
イロット制御部にも接続され、方向切換弁１２のＴポー
トはタンク１５に接続され、該方向切換弁１２のパイロ
ット制御部１２ａはバケット用パイロット弁１６にパイ
ロット油路１７により接続されている。In FIG. 1, a first hydraulic circuit includes a main hydraulic pump 1, a boom second-speed directional control valve 2, and a turning directional control valve 3.
And the main hydraulic pump 1
And the boom second speed directional control valve 2 are connected by a discharge oil supply oil passage 5, and the boom second speed directional control valve 2 and the turning directional control valve 3
The turning direction control valve 3 and the arm first speed direction control valve 4 are connected in tandem, respectively, and the boom second speed direction control valve 2 is
The boom cylinders 6 and 6 and the turning direction control valve 3 are a turning motor (not shown) and an arm first speed direction control valve 4.
Are connected to the arm cylinder 7 respectively. The parallel oil passage 8 branched from the discharge oil supply oil passage 5 is connected to the input ports of the turning direction control valve 3 and the arm first speed direction control valve 4, respectively, to control the turning direction of the parallel oil passage 8. A turning variable priority valve 9 is interposed downstream of the valve 3 and upstream of the direction control valve 4 for the first speed arm. The turning variable priority valve 9
Is connected to a turning pilot valve 11 via a shuttle valve 10, and the other pilot control unit 9 b of the turning variable priority valve 9 is connected to an A port of a direction switching valve 12 to switch the direction. The P port of the valve 12 is connected to a boom raising pilot valve 13 by a pilot oil passage 14, and when the pilot pressure of the boom raising pilot valve 13 acts on the other pilot control unit 9 b of the swing variable priority valve 9. The turning variable priority valve 9 is switched to an oil passage release side position 9d. The boom raising pilot valve 13 is also connected to a pilot control unit of the boom second speed directional control valve 2, a T port of the directional control valve 12 is connected to a tank 15, and a pilot control unit of the directional control valve 12. Reference numeral 12a is connected to a pilot valve 16 for bucket by a pilot oil passage 17.
【０００８】次に、第２油圧回路は主油圧ポンプ１８、
ブーム１速用方向制御弁１９、バケット用方向制御弁２
０及びアーム２速用方向制御弁２１を含み、主油圧ポン
プ１８とブーム１速用方向制御弁１９は吐出油供給油路
２２で接続され、ブーム１速用方向制御弁１９とバケッ
ト用方向制御弁２０及びバケット用方向制御弁２０とア
ーム２速用方向制御弁２１は夫々タンデム接続され、ブ
ーム１速用方向制御弁１９は２本のブームシリンダ６、
６と、バケット用方向制御弁２０はバケットシリンダ２
３と、アーム２速用方向制御弁２１はアームシリンダ７
と夫々接続されている。そして、前記吐出油供給油路２
２から分岐したパラレル油路２４はバケット用方向制御
弁２０及びアーム２速用方向制御弁２１の入力ポートに
夫々接続され、前記ブーム上げ用パイロット弁１３はブ
ーム１速用方向制御弁１９のパイロット制御部に、ま
た、前記バケット用パイロット弁１６はバケット用方向
制御弁２０のパイロット制御部に夫々接続されている。Next, the second hydraulic circuit includes a main hydraulic pump 18,
Boom 1st speed directional control valve 19, bucket directional control valve 2
The main hydraulic pump 18 and the boom 1-speed directional control valve 19 are connected by a discharge oil supply oil passage 22, and the boom 1-speed directional control valve 19 and the bucket directional control 21 are included. The valve 20, the bucket directional control valve 20, and the arm second-speed directional control valve 21 are connected in tandem, respectively, and the boom first-speed directional control valve 19 is provided with two boom cylinders 6.
6 and the bucket directional control valve 20
3 and the arm second speed direction control valve 21
And are connected respectively. And the discharge oil supply oil passage 2
2 is connected to input ports of a bucket directional control valve 20 and an arm second-speed directional control valve 21, respectively. The boom raising pilot valve 13 is connected to a pilot of a boom first-speed directional control valve 19. The control unit and the bucket pilot valve 16 are connected to a pilot control unit of the bucket direction control valve 20, respectively.
【０００９】次に、図２において、第１油圧回路は主油
圧ポンプ１、ブーム２速用方向制御弁２、旋回用方向制
御弁３及びアーム１速用方向制御弁４を含み、主油圧ポ
ンプ１とブーム２速用方向制御弁２は吐出油供給油路５
で接続され、ブーム２速用方向制御弁２と旋回用方向制
御弁３及び旋回用方向制御弁３とアーム１速用方向制御
弁４は夫々タンデム接続され、ブーム２速用方向制御弁
２は２本のブームシリンダ６、６と、旋回用方向制御弁
３は図示していない旋回モータと、アーム１速用方向制
御弁４はアームシリンダ７と夫々接続されている。そし
て、前記吐出油供給油路５から分岐したパラレル油路８
は旋回用方向制御弁３及びアーム１速用方向制御弁４の
入力ポートに夫々接続され、該パラレル油路８の旋回用
方向制御弁３の下流でアーム１速用方向制御弁４の上流
には旋回可変優先弁９が介装され、該旋回可変優先弁９
のパイロット制御部９ａはシャトル弁２５を介して図示
してない制御装置からの信号で切り換わる電磁切換弁２
６のＡポートに接続され、該電磁切換弁２６のＰポート
はパイロットポンプ２７に、また、Ｔポートはタンク１
５に夫々接続され、前記シャトル弁２５はパイロット油
路２８によりバケット用パイロット弁１６に接続されて
いる。そして、前記旋回可変優先弁９のパイロット制御
部９ａに該バケット用パイロット弁１６又は前記パイロ
ットポンプ２７のパイロット圧が作用した場合に前記旋
回可変優先弁９は油路絞り側ポジション９ｃに切り換え
られる。Next, in FIG. 2, the first hydraulic circuit includes a main hydraulic pump 1, a boom second-speed directional control valve 2, a turning directional control valve 3, and an arm first-speed directional control valve 4. 1 and boom second speed direction control valve 2
The directional control valve 2 for the boom 2nd speed and the directional control valve 3 for turning and the directional control valve 3 for turning and the directional control valve 4 for the arm 1 speed are connected in tandem, respectively. The two boom cylinders 6 and 6, the turning direction control valve 3 are connected to a turning motor (not shown), and the arm first speed direction control valve 4 is connected to an arm cylinder 7, respectively. The parallel oil passage 8 branched from the discharge oil supply oil passage 5
Are connected to the input ports of the directional control valve 3 for turning and the directional control valve 4 for arm 1 speed, respectively, and downstream of the directional control valve 3 for turning and upstream of the directional control valve 4 for arm 1 speed in the parallel oil passage 8. Is provided with a turning variable priority valve 9.
Is controlled by a signal from a control device (not shown) via a shuttle valve 25.
6, the P port of the electromagnetic switching valve 26 is connected to the pilot pump 27, and the T port is connected to the tank 1
5, the shuttle valve 25 is connected to the bucket pilot valve 16 by a pilot oil passage 28. When the pilot pressure of the bucket pilot valve 16 or the pilot pump 27 acts on the pilot control section 9a of the swing variable priority valve 9, the swing variable priority valve 9 is switched to the oil path throttle side position 9c.
【００１０】次に、第２油圧回路は主油圧ポンプ１８、
ブーム１速用方向制御弁１９、バケット用方向制御弁２
０及びアーム２速用方向制御弁２１を含み、主油圧ポン
プ１８とブーム１速用方向制御弁１９は吐出油供給油路
２２で接続され、ブーム１速用方向制御弁１９とバケッ
ト用方向制御弁２０及びバケット用方向制御弁２０とア
ーム２速用方向制御弁２１は夫々タンデム接続され、ブ
ーム１速用方向制御弁１９は２本のブームシリンダ６、
６と、バケット用方向制御弁２０はバケットシリンダ２
３と、アーム２速用方向制御弁２１はアームシリンダ７
と夫々接続されている。そして、前記吐出油供給油路２
２から分岐したパラレル油路２４はバケット用方向制御
弁２０及びアーム２速用方向制御弁２１の入力ポートに
夫々接続され、前記バケット用パイロット弁１６はバケ
ット用方向制御弁２０のパイロット制御部に接続されて
いる。Next, the second hydraulic circuit includes a main hydraulic pump 18,
Boom 1st speed directional control valve 19, bucket directional control valve 2
The main hydraulic pump 18 and the boom 1-speed directional control valve 19 are connected by a discharge oil supply oil passage 22, and the boom 1-speed directional control valve 19 and the bucket directional control 21 are included. The valve 20, the bucket directional control valve 20, and the arm second-speed directional control valve 21 are connected in tandem, respectively, and the boom first-speed directional control valve 19 is provided with two boom cylinders 6.
6 and the bucket directional control valve 20
3 and the arm second speed direction control valve 21
And are connected respectively. And the discharge oil supply oil passage 2
2 is connected to the input ports of the directional control valve 20 for buckets and the directional control valve 21 for the second-speed arm, respectively, and the pilot valve 16 for buckets is connected to the pilot control unit of the directional control valve 20 for buckets. It is connected.
【００１１】次に、図３において、第１油圧回路は主油
圧ポンプ１、ブーム２速用方向制御弁２、旋回用方向制
御弁３及びアーム１速用方向制御弁４を含み、主油圧ポ
ンプ１とブーム２速用方向制御弁２は吐出油供給油路５
で接続され、ブーム２速用方向制御弁２と旋回用方向制
御弁３及び旋回用方向制御弁３とアーム１速用方向制御
弁４は夫々タンデム接続され、ブーム２速用方向制御弁
２は２本のブームシリンダ６、６と、旋回用方向制御弁
３は図示していない旋回モータと、アーム１速用方向制
御弁４はアームシリンダ７と夫々接続されている。そし
て、前記吐出油供給油路５から分岐したパラレル油路８
は旋回用方向制御弁３及びアーム１速用方向制御弁４の
入力ポートに夫々接続され、該パラレル油路８の旋回用
方向制御弁３の下流でアーム１速用方向制御弁４の上流
には旋回可変優先弁９が介装され、該旋回可変優先弁９
のパイロット制御部９ａはシャトル弁２９及びシャトル
弁１０を介して旋回用パイロット弁１１に接続され、更
に、前記シャトル弁２９はパイロット油路２８によりバ
ケット用パイロット弁１６に接続されている。そして、
前記旋回可変優先弁９のパイロット制御部９ａに該バケ
ット用パイロット弁１６又は前記旋回用パイロット弁１
１のパイロット圧が作用した場合に前記旋回可変優先弁
９は油路絞り側ポジション９ｃに切り換えられる。ただ
し、本発明はバケット閉じ、アーム閉じ及びブーム上げ
を同時操作する場合であるから、前記旋回用パイロット
弁１１は中立位置にあり、該旋回用パイロット弁１１の
パイロット圧が前記旋回可変優先弁９のパイロット制御
部９ａに作用する場合は想定していない。Next, in FIG. 3, the first hydraulic circuit includes a main hydraulic pump 1, a boom second speed directional control valve 2, a turning directional control valve 3, and an arm first speed directional control valve 4. 1 and boom second speed direction control valve 2
The directional control valve 2 for the boom 2nd speed and the directional control valve 3 for turning and the directional control valve 3 for turning and the directional control valve 4 for the arm 1 speed are connected in tandem, respectively. The two boom cylinders 6 and 6, the turning direction control valve 3 are connected to a turning motor (not shown), and the arm first speed direction control valve 4 is connected to an arm cylinder 7. The parallel oil passage 8 branched from the discharge oil supply oil passage 5
Are connected to the input ports of the directional control valve 3 for turning and the directional control valve 4 for arm 1 speed, respectively, and downstream of the directional control valve 3 for turning and upstream of the directional control valve 4 for arm 1 speed in the parallel oil passage 8. Is provided with a turning variable priority valve 9.
The pilot control unit 9a is connected to the turning pilot valve 11 via the shuttle valve 29 and the shuttle valve 10, and the shuttle valve 29 is connected to the bucket pilot valve 16 via the pilot oil passage 28. And
The pilot valve for bucket 16 or the pilot valve for turning 1 is provided to the pilot control section 9a of the turning variable priority valve 9.
When the pilot pressure of 1 acts, the turning variable priority valve 9 is switched to the oil path throttle side position 9c. However, since the present invention is a case in which the closing of the bucket, the closing of the arm and the raising of the boom are simultaneously performed, the turning pilot valve 11 is in the neutral position, and the pilot pressure of the turning pilot valve 11 is equal to the turning variable priority valve 9. Is not assumed.
【００１２】次に、第２油圧回路は主油圧ポンプ１８、
ブーム１速用方向制御弁１９、バケット用方向制御弁２
０及びアーム２速用方向制御弁２１を含み、主油圧ポン
プ１８とブーム１速用方向制御弁１９は吐出油供給油路
２２で接続され、ブーム１速用方向制御弁１９とバケッ
ト用方向制御弁２０及びバケット用方向制御弁２０とア
ーム２速用方向制御弁２１は夫々タンデム接続され、ブ
ーム１速用方向制御弁１９は２本のブームシリンダ６、
６と、バケット用方向制御弁２０はバケットシリンダ２
３と、アーム２速用方向制御弁２１はアームシリンダ７
と夫々接続されている。そして、前記吐出油供給油路２
２から分岐したパラレル油路２４はバケット用方向制御
弁２０及びアーム２速用方向制御弁２１の入力ポートに
夫々接続され、前記バケット用パイロット弁１６はバケ
ット用方向制御弁２０のパイロット制御部に接続されて
いる。Next, the second hydraulic circuit includes a main hydraulic pump 18,
Boom 1st speed directional control valve 19, bucket directional control valve 2
The main hydraulic pump 18 and the boom 1-speed directional control valve 19 are connected by a discharge oil supply oil passage 22, and the boom 1-speed directional control valve 19 and the bucket directional control 21 are included. The valve 20, the bucket directional control valve 20, and the arm second-speed directional control valve 21 are connected in tandem, respectively, and the boom first-speed directional control valve 19 is provided with two boom cylinders 6.
6 and the bucket directional control valve 20
3 and the arm second speed direction control valve 21
And are connected respectively. And the discharge oil supply oil passage 2
2 is connected to the input ports of the directional control valve 20 for buckets and the directional control valve 21 for the second-speed arm, respectively, and the pilot valve 16 for buckets is connected to the pilot control unit of the directional control valve 20 for buckets. It is connected.
【００１３】次に本発明の作用を説明する。先ず、図１
において、バケット用パイロット弁１６を操作しない場
合は、方向切換弁１２はポジション１２ｂにあり、ブー
ム用パイロット弁１３のパイロット圧は該方向切換弁１
２を介して前記旋回可変優先弁９のパイロット制御部９
ｂへ導出される。しかし、バケット用パイロット弁１６
を操作した場合、バケット用パイロット弁１６からのパ
イロット圧により方向切換弁１２はポジション１２ｃの
位置に切り換えられ、旋回可変優先弁９のパイロット制
御部９ｂへのブーム用パイロット弁１３からのパイロッ
ト圧は遮断され、旋回可変優先弁９は油路絞りポジショ
ン９ｃの位置に切り換えられる。そのため、バケット閉
じ、アーム閉じ及びブーム上げを同時に操作すると前記
パラレル油路８は絞られ回路圧が上昇し、ブーム２速方
向制御弁２からブームシリンダ６、６に供給されるた
め、バケット閉じ、アーム閉じ及びブーム上げを同時に
操作してもバケットの速度を著しく遅くすることはな
い。また、前記アーム１速用方向制御弁４の上流でパラ
レル油路８が絞られるためアーム１速用方向制御弁４へ
の圧油の供給が低下するがアームには図示していない再
生回路が設定されており、特に不具合は生じない。ま
た、方向切換弁１２のバネ１２ｄのバネ定数を変えるこ
とによりバケットフル操作時にだけパラレル油路８を絞
るようにすれば通常の作業においてはパラレル回路８は
開放されるから無駄な圧力損失を防止できる。Next, the operation of the present invention will be described. First, FIG.
, When the bucket pilot valve 16 is not operated, the direction switching valve 12 is at the position 12b, and the pilot pressure of the boom pilot valve 13 is
2 a pilot control unit 9 of the turning variable priority valve 9
b. However, the bucket pilot valve 16
Is operated, the directional control valve 12 is switched to the position 12c by the pilot pressure from the bucket pilot valve 16, and the pilot pressure from the boom pilot valve 13 to the pilot control unit 9b of the swing variable priority valve 9 is It is shut off, and the turning variable priority valve 9 is switched to the position of the oil passage throttle position 9c. Therefore, when the bucket closing, the arm closing and the boom raising are simultaneously operated, the parallel oil passage 8 is throttled to increase the circuit pressure, and is supplied from the boom second speed directional control valve 2 to the boom cylinders 6, 6, so that the bucket closing, Simultaneous operation of arm closing and boom raising does not significantly reduce the bucket speed. Further, since the parallel oil passage 8 is throttled upstream of the first-speed arm direction control valve 4, the supply of pressure oil to the first-speed arm direction control valve 4 is reduced. It is set, and no problem occurs. Also, by changing the spring constant of the spring 12d of the direction switching valve 12 so that the parallel oil passage 8 is throttled only when the bucket is fully operated, the parallel circuit 8 is opened in normal work, so that useless pressure loss is prevented. it can.
【００１４】次に、図２の場合は、バケット用パイロッ
ト弁１６からのバケット閉じパイロット圧をシャトル弁
２５を介して旋回可変優先弁９のパイロット制御部９ａ
に導出すると共に、該バケット閉じ側パイロット圧を圧
力センサで検出して、アーム閉じ、旋回パイロット圧力
センサの検出結果と合わせて制御装置で判断し、その信
号を電磁切換弁２６のソレノイド制御部２６ａに作用さ
せて、該電磁切換弁２６を介してパイロットポンプ２７
のパイロット圧を前記旋回可変優先弁９のパイロット制
御部９ａに作用させることにより旋回可変優先弁９は油
路絞りポジション９ｃの位置に保持され、パラレル油路
８は絞られ、バケット閉じ、アーム閉じ及びブーム上げ
を同時に操作した場合、回路圧が上昇しブーム２速方向
制御弁２からブームシリンダ６、６に供給されるため、
バケット閉じ、アーム閉じ及びブーム上げを同時に操作
してもバケットの速度が著しく遅くなることはない。Next, in the case of FIG. 2, the pilot control unit 9a of the turning variable priority valve 9 applies the bucket closing pilot pressure from the bucket pilot valve 16 via the shuttle valve 25.
The bucket closing side pilot pressure is detected by a pressure sensor, the arm is closed, and the control device determines the pilot pressure in accordance with the detection result of the turning pilot pressure sensor. The signal is sent to the solenoid control unit 26a of the electromagnetic switching valve 26. To the pilot pump 27 via the electromagnetic switching valve 26.
Is applied to the pilot control section 9a of the swing variable priority valve 9, whereby the swing variable priority valve 9 is held at the position of the oil passage throttle position 9c, the parallel oil passage 8 is throttled, the bucket is closed, and the arm is closed. When the boom raising operation is performed at the same time, the circuit pressure rises and is supplied from the boom second speed directional control valve 2 to the boom cylinders 6, 6,
The simultaneous operation of closing the bucket, closing the arm, and raising the boom does not significantly reduce the bucket speed.
【００１５】次に、図３において、バケット用パイロッ
ト弁１６からのバケット閉じパイロット圧をシャトル弁
２９を介して旋回可変優先弁９のパイロット制御部９ａ
に導出することにより旋回可変優先弁９は油路絞りポジ
ション９ｃの位置に保持され、前記パラレル油路８は絞
られ、バケット閉じ、アーム閉じ及びブーム上げを同時
に操作した場合、回路圧が上昇しブーム２速方向制御弁
２からブームシリンダ６、６に供給されるため、バケッ
ト閉じ、アーム閉じ及びブーム上げを同時に操作しても
バケットの速度が著しく遅くなることはなく、制御装置
やセンサを使用することなく前記図１に示す第１実施形
態及び図２に示す第２実施形態と同様の効果を得ること
ができる。Next, referring to FIG. 3, the pilot control unit 9a of the swing variable priority valve 9 applies the bucket closing pilot pressure from the bucket pilot valve 16 via the shuttle valve 29.
When the swing variable priority valve 9 is held at the position of the oil passage throttle position 9c, the parallel oil passage 8 is throttled, and when the bucket is closed, the arm is closed, and the boom is simultaneously operated, the circuit pressure increases. Since the boom cylinder 6 is supplied from the boom second speed directional control valve 2 to the boom cylinders 6, even if the bucket closing, arm closing and boom raising are simultaneously performed, the speed of the bucket does not significantly decrease, and the control device and the sensor are used. The same effects as those of the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 2 can be obtained without doing so.
【００１６】尚、本発明は、本発明の精神を逸脱しない
限り種々の改変を為すことができ、そして、本発明が該
改変されたものに及ぶことは当然である。The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.
【００１７】[0017]
【発明の効果】この発明は、上記実施形態に於いて詳述
した構成により、バケット閉じ、アーム閉じ及びブーム
上げを同時操作する場合においても、ブーム上げに必要
な圧油を十分確保してブームの上げを良くし、作業性を
向上させることができる等きわめて顕著な効果を奏す
る。According to the present invention, the configuration described in detail in the above embodiment ensures sufficient pressure oil necessary for raising the boom even when the bucket closing, arm closing and boom raising are simultaneously performed. And the workability can be improved.
【図１】 本発明の第１実施形態に係る油圧回路図を示
す。FIG. 1 shows a hydraulic circuit diagram according to a first embodiment of the present invention.
【図２】 本発明の第２実施形態に係る油圧回路図を示
す。FIG. 2 shows a hydraulic circuit diagram according to a second embodiment of the present invention.
【図３】 本発明の第３実施形態に係る油圧回路図を示
す。FIG. 3 shows a hydraulic circuit diagram according to a third embodiment of the present invention.
【図４】 従来の実施形態に係る油圧回路図を示す。FIG. 4 shows a hydraulic circuit diagram according to a conventional embodiment.
【図５】 従来の他の実施形態に係る油圧回路図を示
す。FIG. 5 shows a hydraulic circuit diagram according to another conventional embodiment.
【図６】 図５のＡ部詳細図を示す。6 shows a detailed view of a portion A in FIG.
１ 主油圧ポンプ ２ ブーム２速用方向制御弁 ３ 旋回用方向制御弁 ４ アーム１速用方向制御弁 ８ パラレル油路 ９ 旋回可変優先弁 １０ シャトル弁 １１ 旋回用パイロット弁 １２ 方向切換弁 １３ ブーム用パイロット弁 １６ バケット用パイロット弁 １８ 主油圧ポンプ １９ ブーム１速用方向制御弁 ２０ バケット用方向制御弁 ２１ アーム２速用方向制御弁 ２４ パラレル油路 ２５ シャトル弁 ２６ 電磁切換弁 ２７ パイロットポンプ ２９ シャトル弁 DESCRIPTION OF SYMBOLS 1 Main hydraulic pump 2 Boom 2nd-speed directional control valve 3 Swing directional control valve 4 Arm 1st-speed directional control valve 8 Parallel oil passage 9 Turning variable priority valve 10 Shuttle valve 11 Turning pilot valve 12 Direction switching valve 13 For boom Pilot valve 16 Pilot valve for bucket 18 Main hydraulic pump 19 Directional control valve for boom 1st speed 20 Directional control valve for bucket 21 Directional control valve for 2nd arm 24 Parallel oil passage 25 Shuttle valve 26 Electromagnetic switching valve 27 Pilot pump 29 Shuttle valve
Claims (3)
向制御弁を含み、該方向制御弁を夫々パラレル接続した
第１油圧回路とブーム１速、バケット及びアーム２速の
各方向制御弁を含み、該方向制御弁を夫々パラレル接続
した第２油圧回路から構成される油圧回路において、前
記第１油圧回路のパラレル油路の旋回用方向制御弁の下
流に旋回可変優先弁を設け、該旋回可変優先弁の一方の
パイロット制御部を旋回用パイロット弁に連通し、該旋
回可変優先弁の他方のパイロット制御部をバケット用パ
イロット弁からのパイロット圧により切り換えられる方
向切換弁を介してブーム用パイロット弁に連通したこと
を特徴とする油圧ショベルの制御回路。1. A first hydraulic circuit including boom second speed, swing and arm first speed directional control valves, and directional control valves connected in parallel with each other, and boom first speed, bucket and arm second speed directional control valves. In the hydraulic circuit comprising a second hydraulic circuit in which the direction control valves are connected in parallel, a turning variable priority valve is provided downstream of the turning direction control valve in the parallel oil passage of the first hydraulic circuit. One of the pilot control units of the swing variable priority valve communicates with the swing pilot valve, and the other pilot control unit of the swing variable priority valve is connected to the boom via a direction switching valve that is switched by the pilot pressure from the bucket pilot valve. A hydraulic shovel control circuit, which is in communication with a pilot valve.
向制御弁を含み、該方向制御弁を夫々パラレル接続した
第１油圧回路とブーム１速、バケット及びアーム２速の
各方向制御弁を含み、該方向制御弁を夫々パラレル接続
した第２油圧回路から構成される油圧回路において、前
記第１油圧回路のパラレル油路の旋回用方向制御弁の下
流に旋回可変優先弁を設け、該旋回可変優先弁のパイロ
ット制御部をバケット用パイロット弁と所定の信号によ
り切り換わる電磁切換弁を介してパイロットポンプに夫
々接続したことを特徴とする油圧ショベルの制御回路。2. A first hydraulic circuit including boom second speed, swing and arm first speed directional control valves, and directional control valves connected in parallel with each other, and boom first speed, bucket and arm second speed directional control valves. In the hydraulic circuit comprising a second hydraulic circuit in which the direction control valves are connected in parallel, a turning variable priority valve is provided downstream of the turning direction control valve in the parallel oil passage of the first hydraulic circuit. A control circuit for a hydraulic shovel, wherein a pilot control unit of the swing variable priority valve is connected to a pilot pump via a bucket pilot valve and an electromagnetic switching valve switched by a predetermined signal.
向制御弁を含み、該方向制御弁を夫々パラレル接続した
第１油圧回路とブーム１速、バケット及びアーム２速の
各方向制御弁を含み、該方向制御弁を夫々パラレル接続
した第２油圧回路から構成される油圧回路において、前
記第１油圧回路のパラレル油路の旋回用方向制御弁の下
流に旋回可変優先弁を設け、該旋回可変優先弁のパイロ
ット制御部を旋回用パイロット弁とバケット用パイロッ
ト弁に夫々接続したことを特徴とする油圧ショベルの制
御回路。3. A first hydraulic circuit including boom second speed, swing and arm first speed directional control valves, and directional control valves connected in parallel with each other, and boom first speed, bucket and arm second speed directional control valves. In the hydraulic circuit comprising a second hydraulic circuit in which the direction control valves are connected in parallel, a turning variable priority valve is provided downstream of the turning direction control valve in the parallel oil passage of the first hydraulic circuit. A control circuit for a hydraulic shovel, wherein a pilot control section of a swing variable priority valve is connected to a swing pilot valve and a bucket pilot valve, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000188353A JP3532833B2 (en) | 2000-06-22 | 2000-06-22 | Hydraulic excavator control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000188353A JP3532833B2 (en) | 2000-06-22 | 2000-06-22 | Hydraulic excavator control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002004339A true JP2002004339A (en) | 2002-01-09 |
| JP3532833B2 JP3532833B2 (en) | 2004-05-31 |
Family
ID=18688153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000188353A Expired - Fee Related JP3532833B2 (en) | 2000-06-22 | 2000-06-22 | Hydraulic excavator control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3532833B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008261373A (en) * | 2007-04-10 | 2008-10-30 | Kobelco Contstruction Machinery Ltd | Hydraulic control device of work machine |
| JP2011017135A (en) * | 2009-07-07 | 2011-01-27 | Sumitomo (Shi) Construction Machinery Co Ltd | Hydraulic circuit of construction machinery |
| WO2012121252A1 (en) | 2011-03-08 | 2012-09-13 | 住友建機株式会社 | Shovel and method for controlling shovel |
| CN111058509A (en) * | 2019-12-31 | 2020-04-24 | 山东临工工程机械有限公司 | Main control valve for realizing flow distribution of excavator bucket |
-
2000
- 2000-06-22 JP JP2000188353A patent/JP3532833B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008261373A (en) * | 2007-04-10 | 2008-10-30 | Kobelco Contstruction Machinery Ltd | Hydraulic control device of work machine |
| JP2011017135A (en) * | 2009-07-07 | 2011-01-27 | Sumitomo (Shi) Construction Machinery Co Ltd | Hydraulic circuit of construction machinery |
| WO2012121252A1 (en) | 2011-03-08 | 2012-09-13 | 住友建機株式会社 | Shovel and method for controlling shovel |
| US8972122B2 (en) | 2011-03-08 | 2015-03-03 | Sumitomo (S.H.I.) Construction Machinery Co., Ltd. | Shovel and method for controlling shovel |
| US9249556B2 (en) | 2011-03-08 | 2016-02-02 | Sumitomo(S.H.I.) Construction Machinery Co., Ltd. | Shovel and method for controlling shovel |
| CN111058509A (en) * | 2019-12-31 | 2020-04-24 | 山东临工工程机械有限公司 | Main control valve for realizing flow distribution of excavator bucket |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3532833B2 (en) | 2004-05-31 |
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