JPH01158123A - Oil-pressure circuit device for oil-pressure excavator - Google Patents
Oil-pressure circuit device for oil-pressure excavatorInfo
- Publication number
- JPH01158123A JPH01158123A JP31603687A JP31603687A JPH01158123A JP H01158123 A JPH01158123 A JP H01158123A JP 31603687 A JP31603687 A JP 31603687A JP 31603687 A JP31603687 A JP 31603687A JP H01158123 A JPH01158123 A JP H01158123A
- Authority
- JP
- Japan
- Prior art keywords
- boom
- arm
- switching valve
- valve
- switching
- 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
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 35
- 238000009412 basement excavation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
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
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は建設車両め油圧掘削作業機の油圧回路装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a hydraulic circuit device for a hydraulic excavator for a construction vehicle.
ブーム、アーム、パケットを含む油圧掘削作業機の油圧
回路にあっては第２図、第３図に示すように２つの油圧
ポンプ１，２のそれぞれの吐出回路３，４にブーム昇降
作動用のブーム切換弁５Ａ、５Ｂと、アーム屈伸作動用
のアーム切換弁６Ａ、６Ｂを設け、これら切換弁５Ａ。As shown in Figs. 2 and 3, in the hydraulic circuit of a hydraulic excavating machine including a boom, arm, and packet, the discharge circuits 3 and 4 of the two hydraulic pumps 1 and 2 are connected to a pump for raising and lowering the boom. Boom switching valves 5A and 5B and arm switching valves 6A and 6B for arm bending and extension operation are provided, and these switching valves 5A.
５Ｂ、及び６Ａ、６Ｂをパイロット圧油により順次に切
換作動のうえ、２つの油圧ポンプ１゜２の圧油を合流し
、１対のブームシリンダ７及び１体のアームシリンダ８
を駆動するようにしている。5B, 6A, and 6B are sequentially switched by pilot pressure oil, and the pressure oil of the two hydraulic pumps 1.2 is combined to form a pair of boom cylinders 7 and one arm cylinder 8.
I like to drive.
上記の場合、ブームシリンダ７及びアームシリンダ８は
２つの油圧ポンプ１，２で強力に駆動されるので、重掘
削の場合は良いが、重掘削作業後の比較的に力を必要と
しない中級掘削作業及びブーム、アームシリンダ７．８
の作動速度を遅くしての整正なならし作業等を行う場合
には、２つの油圧ポンプ１，２の合流油を、ブーム、ア
ーム切換弁５Ａ、５Ｂ、６Ａ、６Ｂの切換ストロークを
調整操作のうえシリンダ流入流量を絞って行なわなけれ
ばならず、操作が繁雑で一定せず初心オペレータにとっ
ては操縦が難しいものになっていた。In the above case, the boom cylinder 7 and arm cylinder 8 are powerfully driven by the two hydraulic pumps 1 and 2, so it is good for heavy excavation, but it is suitable for intermediate excavation that requires relatively little force after heavy excavation work. Work and boom, arm cylinder 7.8
When performing straightening and leveling work by slowing down the operating speed, adjust the combined oil of the two hydraulic pumps 1 and 2 and the switching stroke of the boom and arm switching valves 5A, 5B, 6A, and 6B. In addition to the operation, the cylinder inflow flow rate must be throttled, and the operation is complicated and inconsistent, making it difficult for novice operators to operate.
本発明は上記の事情に鑑みなされたものであって、その
目的とするところは、ブーム、アームシリンダへの２つ
の油圧ポンプの供出流量を変えることで、ブーム、アー
ムシリンダの力及び速度を制御することができて、作業
機操作が簡単になり初心オペレータにとって操縦を容易
ならしめる油圧掘削作業機の油圧回路装置を提供するこ
とにある。The present invention has been made in view of the above circumstances, and its purpose is to control the force and speed of the boom and arm cylinder by changing the supply flow rate of two hydraulic pumps to the boom and arm cylinder. To provide a hydraulic circuit device for a hydraulic excavating work machine, which enables easy operation of the work machine and makes it easy for a novice operator to operate the work machine.
上記の目的を達成するために本発明は、一方の油圧ポン
プ２１の油圧回路に設けられて切換作動によりアームシ
リンダ３４の伸縮操作を行うアーム低速切換弁２９と、
他方の油圧ポンプ２２の油圧回路に設けられて切換作動
によりブームシリンダ４０の伸縮操作を行うブーム低速
切換弁３７と、一方の油圧ポンプ２１の油圧回路に設け
られて切換作動により油圧ポンプ２１の吐出油をブーム
シリンダ４０のボトム側に供給するブーム高増速切換弁
２５と、他方の油圧ポンプ２２の油圧回路に設けられて
切換作動により油圧ポンプ２２の吐出油をアームシリン
ダ３４に供給するアーム高増速切換弁４２と、ブーム操
作レバー６５に連動して前記ブーム高増速切換弁２５と
ブーム低速切換弁３７との切換操作を行うブーム操作Ｐ
ＣＣ弁５４と、アーム操作レバー６６に連動して前記ア
ーム高増速切換弁４２とアーム低速切換弁２９との切換
操作を行うアーム操作ＰＣＣ弁５２と、前記ブーム高増
速切換弁２５の切換パイロット回路に設けられてこの切
換パイロット回路の開閉を行うブーム操作モード切換弁
６３と、前記アーム高増速切換弁４２の切換パイロット
回路に設けられてこの切換パイロット回路の開閉を行う
アーム操作モード切換弁６０とを備えた構成にしである
。In order to achieve the above object, the present invention includes an arm low-speed switching valve 29 that is provided in the hydraulic circuit of one of the hydraulic pumps 21 and performs a switching operation to extend and retract the arm cylinder 34;
A boom low-speed switching valve 37 is provided in the hydraulic circuit of the other hydraulic pump 22 and performs a switching operation to extend and retract the boom cylinder 40, and a boom low-speed switching valve 37 is provided in the hydraulic circuit of one hydraulic pump 21 and performs a switching operation to extend and retract the boom cylinder 40. A boom high speed increase switching valve 25 that supplies oil to the bottom side of the boom cylinder 40 and an arm height switch valve that is provided in the hydraulic circuit of the other hydraulic pump 22 and supplies oil discharged from the hydraulic pump 22 to the arm cylinder 34 by switching operation. A boom operation P that performs a switching operation between the boom high speed increase changeover valve 25 and the boom low speed changeover valve 37 in conjunction with the speed increase changeover valve 42 and the boom operation lever 65.
Switching of the CC valve 54, the arm operation PCC valve 52 which performs switching operation between the arm high speed increase switching valve 42 and the arm low speed changeover valve 29 in conjunction with the arm operation lever 66, and the boom high speed increase switching valve 25. A boom operation mode switching valve 63 that is provided in the pilot circuit and opens and closes this switching pilot circuit; and an arm operation mode switching valve that is provided in the switching pilot circuit of the arm high speed increase switching valve 42 and opens and closes this switching pilot circuit. The configuration includes a valve 60.
ブーム操作モード切換弁６３及びアーム操作モード切換
弁６０を作動せずに、ブーム操作レバー６５を操作して
ブーム操作ＰＣＣ弁５４を作動しブーム高増速切換弁２
５及びブーム低速切換弁３７を切換えて一方の油圧ポン
プ２１の圧油及び他方の油圧ポンプ２２の圧油をそれぞ
れブームシリンダ４０のボトム側に供給してブームシリ
ンダ４０を伸長作動する。Without operating the boom operation mode switching valve 63 and arm operation mode switching valve 60, the boom operation lever 65 is operated to operate the boom operation PCC valve 54, and the boom high speed increase switching valve 2 is activated.
5 and boom low-speed switching valve 37 to supply pressure oil from one hydraulic pump 21 and pressure oil from the other hydraulic pump 22 to the bottom side of the boom cylinder 40, thereby extending the boom cylinder 40.
そして、ブーム操作モード切換弁６３を切換えることに
よりブーム高増速切換弁２５へのパイロット圧を遮断し
、ブーム高増速切換弁２５からブームシリンダ４０への
油の供給を止めブームシリンダ４０への圧油の供給を他
方の油圧ボフン２２からのみ行う。またアーム操作レバ
ー６６を操作してアーム操作ＰＣＣ弁５２を作動しアー
ム高増速切換弁４２及びアーム低速切換弁２９を切換え
て一方の圧油ポンプ２１の圧油及び他方の油圧ポンプ２
２の圧油をそれぞれアームシリンダ３４のボトム側に供
給してアームシリンダ３４を伸長作動する。Then, by switching the boom operation mode switching valve 63, the pilot pressure to the boom high speed increase switching valve 25 is cut off, and the oil supply from the boom high speed increase switching valve 25 to the boom cylinder 40 is stopped. Pressure oil is supplied only from the other hydraulic buff 22. In addition, the arm operation lever 66 is operated to operate the arm operation PCC valve 52, and the arm high speed increase switching valve 42 and the arm low speed switching valve 29 are switched to switch the pressure oil of one pressure oil pump 21 and the other hydraulic pump 2.
The two pressure oils are respectively supplied to the bottom side of the arm cylinder 34 to cause the arm cylinder 34 to extend.
そして、アーム操作モー切換弁６０を切換えることによ
りアーム高増速切換弁４２へのパイロット圧を遮断し、
アーム高増速切換弁４２からアームシリンダ３４への油
の供給を止めアームシリンダ３４への圧油の供給を一方
の油圧ポンプ２１からのみ行う。Then, by switching the arm operation mode switching valve 60, the pilot pressure to the arm high speed increase switching valve 42 is cut off,
The supply of oil from the arm high speed increase switching valve 42 to the arm cylinder 34 is stopped, and pressure oil is supplied to the arm cylinder 34 only from one hydraulic pump 21.
以下、本発明の実施例を第１図に基づいて説明する。 Embodiments of the present invention will be described below with reference to FIG.
図面中２０は固定容量形のパイロットコントロールポン
プ、２１，２２は可変容量形の油圧ポンプである。In the drawing, 20 is a fixed displacement pilot control pump, and 21 and 22 are variable displacement hydraulic pumps.
一方の油圧ポンプ２１の吐出側は管路２３゜２４を介し
てブーム高増速切換弁２５のポート２５ａ、２５ｂに接
続してあり、管路２３にチエツク弁２６が設けである。The discharge side of one hydraulic pump 21 is connected to ports 25a and 25b of a boom high speed increase switching valve 25 via pipes 23 and 24, and a check valve 26 is provided in the pipe 23.
ブーム高増速切換弁２５のポート２５ｃはタンク２７に
通じており、ポート２５ｄは管路２８を介してアーム低
速切換弁２９のポート２９ａに接続しである。The port 25c of the boom high speed increase switching valve 25 communicates with the tank 27, and the port 25d is connected to the port 29a of the arm low speed switching valve 29 via a conduit 28.
また前記油圧ポンプ２１の吐出側は管路３０を介してア
ーム低速切換弁２９のポート２９ｂに接続してあり、こ
の管路３０にチエツク弁３１が設けである。アーム低速
切換弁２９のポート２９ｃ、２９ｄは管路３２，３３を
介してアームシリンダ３４に接続してあり、アーム低速
切換弁２９のポート２９ｅ、２９ｆはタンク２７に通じ
ている。Further, the discharge side of the hydraulic pump 21 is connected to the port 29b of the arm low-speed switching valve 29 via a conduit 30, and this conduit 30 is provided with a check valve 31. Ports 29c and 29d of the arm low-speed switching valve 29 are connected to the arm cylinder 34 via pipes 32 and 33, and ports 29e and 29f of the arm low-speed switching valve 29 communicate with the tank 27.
他方の油圧ポンプ２２の吐出側は管路３５゜３６を介し
てブーム低速切換弁３７のポート３７ａ、３７ｂに接続
してあり、管路３５にチエツク弁３６′が設けである。The discharge side of the other hydraulic pump 22 is connected to ports 37a and 37b of a boom low-speed switching valve 37 via lines 35 and 36, and the line 35 is provided with a check valve 36'.
ブーム低速切換弁３７のポート３７．ｃはタンク２７に
通じており、ポー）３７ｄ、３７ｅは管路３８，３９を
介してブームシリンダ４０に接続しである。またブーム
低速切換弁３７のポート３７ｆは管路１１とチエツク弁
４３を有する管路４４を介してアーム高増速切換弁４２
のポート４２ａ、 ４２ｂに接続しである。また前記油
圧ポンプ２２の吐出側は管路４５を介してアーム高増速
切換弁４２のポート４２ｂに接続しである。アーム高増
速切換弁４２のボード４２ｃ、４２ｄは管路４６゜４７
を介してアームシリンダ３４に接続してあり、アーム高
増速切換弁４２のポート４２ｅ。Port 37 of boom low speed switching valve 37. C is connected to the tank 27, and ports 37d and 37e are connected to the boom cylinder 40 via pipes 38 and 39. Also, the port 37f of the boom low-speed switching valve 37 is connected to the arm high-speed switching valve 42 via a pipe 11 and a pipe 44 having a check valve 43.
It is connected to ports 42a and 42b of. Further, the discharge side of the hydraulic pump 22 is connected to the port 42b of the arm high speed increase switching valve 42 via a conduit 45. Boards 42c and 42d of the arm high speed increase switching valve 42 are connected to pipes 46° and 47.
It is connected to the arm cylinder 34 via the port 42e of the arm high speed increase switching valve 42.
４２ｆはタンク２７に通じている。42f communicates with tank 27.
また前記管路４７にチエツク４８が設けてあり、前記ブ
ーム高増速切換弁２５のポート２５ｅは管路４９を介し
てブームシリンダ４０のボトム側に接続してあり、この
管路４９にチエツク弁５０が設けである。Further, a check 48 is provided in the pipe 47, and the port 25e of the boom high speed increase switching valve 25 is connected to the bottom side of the boom cylinder 40 via a pipe 49. 50 is the default.
前記パイロットコントロールポンプ２０の一方の吐出管
路５１にアーム操作ＰＰＣ弁５２が、他方の吐出管路５
３にブーム操作ＰＰＣ弁５４がそれぞれ設けてあり、吐
出管路５１．５３はアキュームレータ５５に通じている
。An arm-operated PPC valve 52 is connected to one discharge pipe line 51 of the pilot control pump 20, and an arm-operated PPC valve 52 is connected to one discharge pipe line 51 of the pilot control pump 20.
3 are each provided with a boom-operated PPC valve 54 , and the discharge line 51 , 53 leads to an accumulator 55 .
前記アーム操作ＰＰＣ弁５２のパイロットボート５２ａ
はパイロット管路５６．５７を介してアーム高増速、低
速切換弁４２．２９の一方のパイロットポート４２ｇ、
２９ｇに接続してあり、アーム操作ＰＰＣ弁５２のパイ
ロ・ットボート５２ｂはパイロット管路５８．５９を介
してアーム高増速、低速切換弁４２．２９の他方のパイ
ロットポート４２ｉ、２９ｉに接続してあり、パイロッ
ト管路５８にアーム操作モード切換弁６０が設けである
。Pilot boat 52a of the arm-operated PPC valve 52
is one pilot port 42g of the arm high speed increase/low speed switching valve 42.29 via the pilot pipe 56.57,
The pilot boat 52b of the arm operation PPC valve 52 is connected to the other pilot port 42i, 29i of the arm high speed increase/low speed switching valve 42.29 via the pilot line 58.59. An arm operation mode switching valve 60 is provided in the pilot conduit 58.
また、前記ブーム操作ＰＰＣ弁５４のパイロットポート
５４ａはパイロット管路６１．６２を介してブーム高増
速、低速切換弁２５．３７のパイロットポート２５ｇ、
３７ｇに接続してあり、パイロット管路６１にブーム操
作モード切換弁６３が設けてあり、ブーム操作ＰＰＣ弁
５４のパイロットポート５４ｂはパイロット管路６４を
介してブーム低速切換弁３７のパイロットポート３７ｉ
に接続しである。Further, the pilot port 54a of the boom operation PPC valve 54 is connected to the pilot port 25g of the boom high speed increase/low speed switching valve 25.37 via the pilot pipe 61.62.
37g, a boom operation mode switching valve 63 is provided in the pilot line 61, and the pilot port 54b of the boom operation PPC valve 54 is connected to the pilot port 37i of the boom low speed switching valve 37 via the pilot line 64.
It is connected to.
次に作動を説明する。Next, the operation will be explained.
ブーム操作し／（−６５を上げ側に操作すると、ブーム
操作ＰＰＣ弁５４が作動してブーム高増速切換弁２５の
パイロットポート２５ｇ及びブーム低速切換弁３７のパ
イロットポート３７ｇにそれぞれパイロット圧が立ち、
ブーム高増速、低速切換弁２５．３７がそれぞれ切換え
られる。When the boom is operated/(-65 is operated to the upward side, the boom operation PPC valve 54 is activated and pilot pressure is established at the pilot port 25g of the boom high speed increase switching valve 25 and the pilot port 37g of the boom low speed switching valve 37. ,
The boom high speed increase and low speed switching valves 25 and 37 are respectively switched.
このために、油圧ポンプ２２の吐出油はブーム低速切換
弁３７、管路３８を経てブームシリンダ４０のボトム側
に入り、また油圧ポンプ２１の吐出油はブーム高増速切
換弁２５、管路４９を経てブームシリンダ４０のボトム
側に入るためにブームシリンダ４０は伸長される。For this purpose, the oil discharged from the hydraulic pump 22 enters the bottom side of the boom cylinder 40 via the boom low-speed switching valve 37 and the pipe line 38, and the oil discharged from the hydraulic pump 21 passes through the boom high-speed switching valve 25 and the pipe line 49. The boom cylinder 40 is extended to enter the bottom side of the boom cylinder 40 through.
また、ブーム操作モード切換弁６３を切換えることによ
りブーム高増速切換弁２５のパイロットポート２５ｇへ
のパイロット圧を遮断し、ブーム高増速切換弁２５を中
立に切換えることにより、ブームシリンダ４０には油圧
ポンプ２２からの吐出油のみを流す。In addition, by switching the boom operation mode switching valve 63, the pilot pressure to the pilot port 25g of the boom high speed increase switching valve 25 is cut off, and by switching the boom high speed increase switching valve 25 to neutral, the boom cylinder 40 Only the oil discharged from the hydraulic pump 22 is allowed to flow.
ブーム操作レバー６５を下げ側に操作すると、ブーム操
作ＰＰＣ弁５４が上記とは逆方向に作動してブーム低速
切換弁３７のパイロットポート３７１にパイロット圧が
立ち、ブーム低速切換弁３７が切換えられて油圧ポンプ
２２の吐出油はブームシリンダ４０のロッド側に流れて
、このブームシリンダ４０は縮小する。When the boom operation lever 65 is operated to the lower side, the boom operation PPC valve 54 operates in the opposite direction to the above, pilot pressure is established in the pilot port 371 of the boom low speed switching valve 37, and the boom low speed switching valve 37 is switched. The oil discharged from the hydraulic pump 22 flows to the rod side of the boom cylinder 40, and the boom cylinder 40 contracts.
アーム操作レバー６６を上げ側に操作すると、アーム操
作ＰＰＣ弁５２が作動してアーム高増速切換弁４２のパ
イロットポート４２１及びアー・ム低速切換弁２９のパ
イロットポート２９ｉにそれぞれパイロット圧が立ち、
アーム高増速、低速切換弁４２．２９がそれぞれ切換え
られる。When the arm operation lever 66 is operated to the upward side, the arm operation PPC valve 52 is activated, and pilot pressure is established in the pilot port 421 of the arm high speed increase switching valve 42 and the pilot port 29i of the arm low speed switching valve 29, respectively.
The arm high speed increase and low speed switching valves 42 and 29 are respectively switched.
このために、油圧ポンプ２１の吐出油はアーム低速切換
弁２９、管路３２を経てアームシリンダ３４のボトム側
に入り、また油圧ポンプ２２の吐出油はアーム高増速切
換弁４２、管路４６を経てアームシリンダ３４のボトム
側に入るためにアームシリンダ３４は増速速度で伸長さ
れる。For this purpose, the oil discharged from the hydraulic pump 21 enters the bottom side of the arm cylinder 34 via the arm low-speed switching valve 29 and the pipe line 32, and the oil discharged from the hydraulic pump 22 passes through the arm high-speed switching valve 42 and the pipe line 46. The arm cylinder 34 is extended at an increasing speed in order to enter the bottom side of the arm cylinder 34 through the .
また、アーム操作モード切換弁６０を切換えることによ
りアーム高増速切換弁４２のパイロットポート４２ｉへ
のパイロット圧を遮断し、アーム高増速切換弁４２を中
立に切換えることにより、アームシリンダ３４には油圧
ポンプ２１からの吐出油のみを流す。In addition, by switching the arm operation mode switching valve 60, the pilot pressure to the pilot port 42i of the arm high speed increase switching valve 42 is cut off, and by switching the arm high speed increase switching valve 42 to neutral, the arm cylinder 34 is Only the oil discharged from the hydraulic pump 21 is allowed to flow.
アーム操作レバー６６を下げ側に操作すると、アーム操
作ＰＰＣ弁５２が上記とは逆方向に作動してアーム高増
速、低速切換弁４２．２７のパイロットポート２９ｇ、
４２ｇにパイロット圧が立ち、アーム高増速、低速切換
弁４２．２７が切換えられて油圧ポンプ２１の吐出油は
アームシリンダ３４のロッド側に流れて、このアームシ
リンダ３４は縮小する。When the arm operation lever 66 is operated to the lower side, the arm operation PPC valve 52 operates in the opposite direction to the above, and the pilot port 29g of the arm high speed increase/low speed switching valve 42.27,
The pilot pressure is set at 42g, the arm high speed increase/low speed switching valve 42.27 is switched, and the oil discharged from the hydraulic pump 21 flows to the rod side of the arm cylinder 34, and this arm cylinder 34 is contracted.
以上詳述したように本発明に係る油圧掘削作業機の油圧
回路装置は、一方の油圧ポンプ２１、ニー油圧回路に設
けられて切換作動によりアームシリンダ３４の伸縮操作
を行うアーム低速切換弁２９と、他方の油圧ポンプ２２
の油圧回路に設けられて切換作動によりブームシリンダ
４０の伸縮操作を行うブーム低速切換弁３７と、−方の
油圧ポンプ２１の油圧回路に設けられて切換作動により
油圧ポンプ２１の吐出油をブームシリンダ４０のボトム
側に供給するブーム高僧４切換弁２５と、他方の油圧ポ
ンプ２２の油圧回路に設けられて切換作動により油圧ポ
ンプ２２の吐出油をアームシリンダ３４に供給するアー
７・１′名増速切換弁４２と、ブーム操作レバー６５に
連動して前記ブーム高増速切換弁２５とブーム低速切換
弁３７との切換操作を行うブーム操作ＰＰＣ弁５４と、
アーム操作レバー６６に連動して前記アーム高増速切換
弁４２とアーム低速切換弁２９との切換操作を行うアー
ム操作ＰＰＣ弁５２と、前記ブーム高増速切換弁２５の
切換パイロット回路に設けられてこの切換パイロット回
路の開閉を行うブーム操作モード切換弁６３と、前記ア
ーム高増速切換弁４２の切換パイロット回路に設けられ
てこの切換パイロット回路の開閉を行うアーム操作モー
ド切換弁６０とを備えたことを特徴とするものである。As described in detail above, the hydraulic circuit device for a hydraulic excavation work machine according to the present invention includes one hydraulic pump 21, an arm low-speed switching valve 29 that is provided in the knee hydraulic circuit, and performs an extension/retraction operation of the arm cylinder 34 by a switching operation. , the other hydraulic pump 22
A boom low-speed switching valve 37 is provided in the hydraulic circuit of the hydraulic pump 21 on the negative side to extend and retract the boom cylinder 40 by switching operation, and a boom low-speed switching valve 37 is provided in the hydraulic circuit of the hydraulic pump 21 on the negative side and transfers the discharge oil of the hydraulic pump 21 to the boom cylinder by switching operation. A boom high priest 4 switching valve 25 that supplies the oil to the bottom side of the hydraulic pump 40 and a switch valve 25 that is provided in the hydraulic circuit of the other hydraulic pump 22 and supplies the oil discharged from the hydraulic pump 22 to the arm cylinder 34 by switching operation. a boom operating PPC valve 54 that performs a switching operation between the boom high speed increase switching valve 25 and the boom low speed switching valve 37 in conjunction with the speed switching valve 42 and the boom operating lever 65;
An arm operating PPC valve 52 that performs a switching operation between the arm high speed increasing switching valve 42 and the arm low speed switching valve 29 in conjunction with the arm operating lever 66 and the boom high speed increasing switching valve 25 are provided in a switching pilot circuit. A boom operation mode switching valve 63 that opens and closes a lever switching pilot circuit, and an arm operation mode switching valve 60 that is provided in the switching pilot circuit of the arm high speed increase switching valve 42 and opens and closes this switching pilot circuit. It is characterized by:
したがって、ブーム操作モード切換弁６３及びアーム操
作モード切換弁６０を作動せずに、ブーム操作レバー６
５を操作してブーム操作ＰＰＣ弁５４を作動しブーム高
増速切換弁２５及びブーム低速切換弁３７を切換えて一
方の油圧ポンプ２１の圧油及び他方の油圧ボン・プ２２
の圧油をそれぞれブームシリンダ４０のボトム側に供給
してブームシリンダ４０を伸長作動する。Therefore, without operating the boom operation mode switching valve 63 and the arm operation mode switching valve 60, the boom operation lever 6
5 to operate the boom operation PPC valve 54 and switch the boom high speed increase switching valve 25 and the boom low speed switching valve 37 to control the pressure oil of one hydraulic pump 21 and the other hydraulic pump 22.
Pressure oil is supplied to the bottom side of the boom cylinder 40 to extend the boom cylinder 40.
そして、ブーム操作モード切換弁６３を切換えることに
よりブーム高増速切換弁２５へのパイロット圧を遮断し
、ブーム高増速切換弁２５からブームシリンダ４０への
油の供給を止めブームシリンダ４０への圧油の供給を他
方の油圧ポンプ２２からのみ行う。またアーム操作レバ
ー６６を操作してアーム操作ＰＰＣ弁５２を作動しアー
ム高増速切換弁４２及びアーム低速切換弁２９を切換え
て一方の油圧ポンプ２１の圧油及び他方の油圧ポンプ２
２の圧油をそれぞれアームシリンダ３４のボトム側に供
給してアームシリンダ３４を伸長作動する。Then, by switching the boom operation mode switching valve 63, the pilot pressure to the boom high speed increase switching valve 25 is cut off, and the oil supply from the boom high speed increase switching valve 25 to the boom cylinder 40 is stopped. Pressure oil is supplied only from the other hydraulic pump 22. In addition, the arm operation lever 66 is operated to operate the arm operation PPC valve 52, and the arm high speed increase switching valve 42 and the arm low speed switching valve 29 are switched to switch the pressure oil of one hydraulic pump 21 and the other hydraulic pump 2.
The two pressure oils are respectively supplied to the bottom side of the arm cylinder 34 to cause the arm cylinder 34 to extend.
そして、アーム操作モード切換弁６０を切換えることに
よりアーム高増速切換弁４２へのパイロット圧を遮断し
、アーム高増速切換弁４２からアームシリンダ３４への
油の供給を止めアームシリンダ３４への圧油の供給を一
方の油圧ポンプ２１からのみ行う。Then, by switching the arm operation mode switching valve 60, the pilot pressure to the arm high speed increase switching valve 42 is cut off, and the supply of oil from the arm high speed increase switching valve 42 to the arm cylinder 34 is stopped. Pressure oil is supplied from only one hydraulic pump 21.
このように、ブーム高増速切換弁２５、ブーム低速切換
弁３７を同時に切換作動して２つの油圧ポンプ２１．２
２の吐出油をブームシリンダ４０に供給し、選択的にブ
ーム低速切換弁３７のみを切換作動して１つ−の油圧ポ
ンプ２２の吐出圧油をブームシリンダ４０に供給するこ
とができるしまた、アーム高増速切換弁４２、アーム低
速切換弁２９を同時に切換作動して２つの油圧ポンプ２
１，２２の吐出圧油をアームシリンダ３４に供給し、選
択的にアーム低速切換弁２９のみを切換作動して１つの
油圧ポンプ２１の吐出圧油をアームシリンダ３４に供給
することができ、ブーム、アームシリンダ４０．３４へ
の油圧ポンプ２１．２２の供出流量を変えることで、ブ
ーム、アームシリンダ４０．３４の力及び速度を制御す
ることができる。In this way, the boom high speed increase switching valve 25 and the boom low speed switching valve 37 are switched simultaneously to operate the two hydraulic pumps 21.2.
The pressure oil discharged from one hydraulic pump 22 can be supplied to the boom cylinder 40 by selectively switching and operating only the boom low-speed switching valve 37. The arm high speed increase switching valve 42 and the arm low speed switching valve 29 are switched simultaneously to operate the two hydraulic pumps 2.
1 and 22 are supplied to the arm cylinder 34, and by selectively switching only the arm low-speed switching valve 29, the discharge pressure oil of one hydraulic pump 21 can be supplied to the arm cylinder 34, and the boom By varying the flow rate of the hydraulic pump 21.22 to the arm cylinder 40.34, the force and speed of the boom and arm cylinder 40.34 can be controlled.
このために、作業機操作が簡単になり初心オペレータに
とって操縦が容品になる。This simplifies the operation of the work machine and makes it easy for novice operators to operate it.
第１図は本発明一実施例の構成説明図、第２図は従来の
油圧掘削作業機の油圧回路装置におけるアームシリンダ
操作回路の構成説明図、第３図は同ブーム操作回路の構
成説明図である。
２１．２２は油圧ポンプ、２５はブーム高増速切換弁、
２９はアーム低速切換弁、３７はブーム高増速切換弁、
４２はアーム高増速切換弁、５２はアーム操作ＰＣＣ弁
、５４はブーム操作ｐｐｃ弁、６０はアーム操作モード
切換弁、６３はブーム操作モード切換弁。
出願人 株式会社 小 松 製 作 所代理人 弁
理士 米 原 正 章Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the configuration of an arm cylinder operation circuit in a hydraulic circuit device of a conventional hydraulic excavation work machine, and Fig. 3 is an explanatory diagram of the configuration of the boom operation circuit. It is. 21.22 is a hydraulic pump, 25 is a boom high speed increase switching valve,
29 is an arm low speed switching valve, 37 is a boom high speed increasing switching valve,
42 is an arm high speed increase switching valve, 52 is an arm operating PCC valve, 54 is a boom operating PPC valve, 60 is an arm operating mode switching valve, and 63 is a boom operating mode switching valve. Applicant Komatsu Manufacturing Co., Ltd. Representative Patent Attorney Masaaki Yonehara
Claims (1)
動によりアームシリンダ３４の伸縮操作を行うアーム低
速切換弁２９と、他方の油圧ポンプ２２の油圧回路に設
けられて切換作動によりブームシリンダ４０の伸縮操作
を行うブーム低速切換弁３７と、一方の油圧ポンプ２１
の油圧回路に設けられて切換作動により油圧ポンプ２１
の吐出油をブームシリンダ４０のボトム側に供給するブ
ーム高増速切換弁２５と、他方の油圧ポンプ２２の油圧
回路に設けられて切換作動により油圧ポンプ２２の吐出
油をアームシリンダ３４に供給するアーム高増速切換弁
４２と、ブーム操作レバー６５に連動して前記ブーム高
増速切換弁２５とブーム低速切換弁３７との切換操作を
行うブーム操作ＰＣＣ弁５４と、アーム操作レバー６６
に連動して前記アーム高増速切換弁４２とアーム低速切
換弁２９との切換操作を行うアーム操作ＰＣＣ弁５２と
、前記ブーム高増速切換弁２５の切換パイロット回路に
設けられてこの切換パイロット回路の開閉を行うブーム
操作モード切換弁６３と、前記アーム高増速切換弁４２
の切換パイロット回路に設けられてこの切換パイロット
回路の開閉を行うアーム操作モード切換弁６０とを備え
たことを特徴とする油圧掘削作業機の油圧回路装置。An arm low-speed switching valve 29 is provided in the hydraulic circuit of one hydraulic pump 21 to extend and retract the arm cylinder 34 through a switching operation, and an arm low-speed switching valve 29 is provided in the hydraulic circuit of the other hydraulic pump 22 to extend and retract the boom cylinder 40 through a switching action. Boom low speed switching valve 37 to be operated and one hydraulic pump 21
Hydraulic pump 21 is installed in the hydraulic circuit of
The boom high speed increase switching valve 25 supplies the discharge oil to the bottom side of the boom cylinder 40, and the boom high speed increase switching valve 25 is provided in the hydraulic circuit of the other hydraulic pump 22 and supplies the discharge oil of the hydraulic pump 22 to the arm cylinder 34 by switching operation. An arm high speed increase changeover valve 42, a boom operation PCC valve 54 that performs a switching operation between the boom high speed increase changeover valve 25 and the boom low speed changeover valve 37 in conjunction with the boom operation lever 65, and an arm operation lever 66.
An arm operation PCC valve 52 that performs a switching operation between the arm high speed increase switching valve 42 and the arm low speed changeover valve 29 in conjunction with the boom high speed increase switching valve 25 is provided in the switching pilot circuit of the boom high speed increase switching valve 25. A boom operation mode switching valve 63 that opens and closes the circuit, and the arm high speed increase switching valve 42
1. A hydraulic circuit device for a hydraulic excavating machine, comprising: an arm operation mode switching valve 60 provided in a switching pilot circuit for opening and closing the switching pilot circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31603687A JPH0826554B2 (en) | 1987-12-16 | 1987-12-16 | Hydraulic circuit device of hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31603687A JPH0826554B2 (en) | 1987-12-16 | 1987-12-16 | Hydraulic circuit device of hydraulic excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01158123A true JPH01158123A (en) | 1989-06-21 |
| JPH0826554B2 JPH0826554B2 (en) | 1996-03-13 |
Family
ID=18072544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31603687A Expired - Fee Related JPH0826554B2 (en) | 1987-12-16 | 1987-12-16 | Hydraulic circuit device of hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0826554B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991000396A1 (en) * | 1989-06-30 | 1991-01-10 | Kabushiki Kaisha Komatsu Seisakusho | Device for operating traveling and working machines of hydraulic excavator |
| US7207175B2 (en) * | 2004-12-16 | 2007-04-24 | Doosan Infracore Co., Ltd. | Hydraulic control device for controlling a boom-arm combined operation in an excavator |
| EP1743980A3 (en) * | 2005-07-15 | 2013-12-04 | Kobelco Construction Machinery Co., Ltd. | Hydraulic control apparatus for hydraulic excavators |
| CN109103805A (en) * | 2018-06-29 | 2018-12-28 | 国家电网公司 | Foreign matter removing is cut |
| CN110762065A (en) * | 2019-10-30 | 2020-02-07 | 燕山大学 | Digital hydraulic actuator system for closed pump valve composite speed regulation and control method thereof |
-
1987
- 1987-12-16 JP JP31603687A patent/JPH0826554B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991000396A1 (en) * | 1989-06-30 | 1991-01-10 | Kabushiki Kaisha Komatsu Seisakusho | Device for operating traveling and working machines of hydraulic excavator |
| US7207175B2 (en) * | 2004-12-16 | 2007-04-24 | Doosan Infracore Co., Ltd. | Hydraulic control device for controlling a boom-arm combined operation in an excavator |
| EP1743980A3 (en) * | 2005-07-15 | 2013-12-04 | Kobelco Construction Machinery Co., Ltd. | Hydraulic control apparatus for hydraulic excavators |
| CN109103805A (en) * | 2018-06-29 | 2018-12-28 | 国家电网公司 | Foreign matter removing is cut |
| CN110762065A (en) * | 2019-10-30 | 2020-02-07 | 燕山大学 | Digital hydraulic actuator system for closed pump valve composite speed regulation and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0826554B2 (en) | 1996-03-13 |
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