JPH0434201A - Hydraulic circuit for construction machine - Google Patents

Hydraulic circuit for construction machine

Info

Publication number
JPH0434201A
JPH0434201A JP14057190A JP14057190A JPH0434201A JP H0434201 A JPH0434201 A JP H0434201A JP 14057190 A JP14057190 A JP 14057190A JP 14057190 A JP14057190 A JP 14057190A JP H0434201 A JPH0434201 A JP H0434201A
Authority
JP
Japan
Prior art keywords
valve
hydraulic
pilot
port
pressure control
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.)
Pending
Application number
JP14057190A
Other languages
Japanese (ja)
Inventor
Hiroshi Oshima
寛 大島
Yoshio Asayama
浅山 芳夫
Mikio Kawaguchi
幹雄 河口
Hiroshi Takada
洋 高田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP14057190A priority Critical patent/JPH0434201A/en
Publication of JPH0434201A publication Critical patent/JPH0434201A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/0422Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with manually-operated pilot valves, e.g. joysticks

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To make it possible to change over a hydraulic operation to an electric operation, by connecting an electric pressure control valve tank port to a hydraulic pilot valve side, a signal port to a pilot port, and a control valve pump port to a pilot hydraulic power source between the hydraulic pilot valve and a main valve pilot port. CONSTITUTION:In the case of manual operation, electric pressure control valves 41a, 41b are placed in manual operation position Q, and an operation lever 10 is operated in accordance with velocity of an actuator 34. Specified pressure is applied to pilot chambers 17a, 17b of a main valve 9 in accordance with operation quantity, a spool is made to operate by a specified quantity from the neutral position 9a of the main valve 9 to drive ports 9b or 9c, and pressure oil of a hydraulic pump 31 is sent to the actuator 34. At the time of driving by the electric pressure control valves 41a, 41b, a hydraulic pilot valve 5 is in the neutral position, pressures Pa, Pb in pipings 6a, 6b become tank pressure Po, and when command value is issued to the electric pressure control valve 41a or 41b, output pressure Pc is output in a piping 42a, or output pressure Pd is output in 42b according thereto, and the main valve 9 is driven. Manual and electric operation can be separately performed therefore.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、建設機械の油圧回路に係わり、特には、油圧
パイロット弁による手動操作の回路に、電気制御弁を加
え、自動運転や、ラジコン(リモコン)操作のような電
気的操作も切換可能な建設機械の油圧回路の改良に関す
る。
Detailed Description of the Invention (Industrial Application Field) The present invention relates to hydraulic circuits for construction machinery, and in particular, the present invention relates to hydraulic circuits for construction machinery, and in particular, by adding an electric control valve to a manually operated circuit using a hydraulic pilot valve, automatic operation and radio-controlled This invention relates to improvements in hydraulic circuits for construction machinery that can also switch electrical operations such as (remote control) operations.

(従来の技術) 従来、自動運転や、ラジコン(リモコン)操作のような
電気的操作も切換可能とする建設機械の油圧回路は第4
図に示すものが知られている。しかし、第4図は説明を
簡易化するために、アクチュエータを駆動する油圧ポン
プからメインバルブまでの油圧源回路あるいはメインバ
ルブからアクチュエータへの給排回路を省略して、1つ
の図示しないアクチュエータを駆動するためのメインバ
ルプを操作する操作回路が記載されたものであるが、実
際には複数のアクチュエータを駆動する給排回路あるい
はこれらを操作する操作回路が複数ある。操作回路は、
通常の手で手動する手動操作回路Aと、ラジコン(リモ
コン)操作(以下、電気的操作という。)のような電気
的操作回路Bと、からなる。手で手動する手動操作回路
Aを用いる場合には、駆M’hM1により駆動される油
圧ポンプ2がタンク3より油を吸引し、配管4.油圧パ
イo ット弁5、配管6a、6b、電磁弁7a17b1
配管8a、8bを介し°C、メインバフ1.ブ9に供給
するが、油圧パイロット弁5の操作レバー10を手で操
作することにより行う。電気的操作回路Bを用いる場合
には、油圧ポンプ2からの圧油は配管4から分岐された
配管11、電気圧力制御弁12、電磁弁7a、7b、配
管8a、8bを介して、メインバルブ9に供給するが、
電気圧力制御弁12の操作はスイッチを電気的操作によ
り操作することにより行う。また、配管4からの配管1
5にはリリーフ弁16が配設されている。油圧パイロッ
ト弁5は可変減圧弁であり、操作レバー10の操作量に
応じて所定の圧力がメインバルブのパイロット室17a
、17bに送られている。
(Conventional technology) Conventionally, hydraulic circuits for construction machinery that can switch between automatic operation and electrical operations such as radio-controlled (remote control) operation have been
The one shown in the figure is known. However, in order to simplify the explanation, FIG. 4 omits the hydraulic power source circuit from the hydraulic pump that drives the actuator to the main valve, or the supply/discharge circuit from the main valve to the actuator, and drives one actuator (not shown). Although an operating circuit for operating the main valve is described, in reality, there are multiple supply/discharge circuits for driving a plurality of actuators or a plurality of operating circuits for operating these. The operating circuit is
It consists of a manual operation circuit A for normal manual operation, and an electric operation circuit B for radio-controlled (remote control) operation (hereinafter referred to as electrical operation). When the manual operation circuit A is used, the hydraulic pump 2 driven by the drive M'hM1 sucks oil from the tank 3, and the piping 4. Hydraulic pipe valve 5, piping 6a, 6b, solenoid valve 7a17b1
°C via piping 8a, 8b, main buff 1. This is done by manually operating the operating lever 10 of the hydraulic pilot valve 5. When using the electrical operation circuit B, the pressure oil from the hydraulic pump 2 passes through the pipe 11 branched from the pipe 4, the electric pressure control valve 12, the solenoid valves 7a, 7b, and the pipes 8a, 8b to the main valve. 9, but
The electric pressure control valve 12 is operated by electrically operating a switch. Also, pipe 1 from pipe 4
5 is provided with a relief valve 16. The hydraulic pilot valve 5 is a variable pressure reducing valve, and a predetermined pressure is applied to the pilot chamber 17a of the main valve according to the amount of operation of the operating lever 10.
, 17b.

電磁弁7a、7bは2位置3ポートからなり、1位置は
手動ポート(M)と他の1位置はラジコン(リモコン)
操作ポート(N)であり、1ポートは油圧パイロット弁
5に、他の1ポートはメインバルブのパイロット室17
a、17bに、残りの1ポートは電気圧力制御弁I2に
接続されており2個の電磁弁7a、7bが配管6a、6
bにそれぞれ配設されている。電気圧力制御弁12は減
圧弁の原理よりなりソレノイドに加えられた電流に比例
した圧力を出力し、接続ポートは3ポートあり、1ポー
トは油圧ポンプ2に、他の1ポートはタンク3に、残り
の1ポートは電磁弁7a、7bに接続されており、2個
の電気圧力制御弁12が配管11にそれぞれ配設されて
いる。
The solenoid valves 7a and 7b consist of 2 positions and 3 ports, one position is a manual port (M) and the other position is a radio control (remote control) port.
These are operation ports (N), one port is connected to the hydraulic pilot valve 5, and the other port is connected to the pilot chamber 17 of the main valve.
a, 17b, and the remaining one port is connected to the electric pressure control valve I2, and the two electromagnetic valves 7a, 7b are connected to the pipes 6a, 6.
b, respectively. The electric pressure control valve 12 is based on the principle of a pressure reducing valve and outputs pressure proportional to the current applied to the solenoid, and has three connection ports, one port is connected to the hydraulic pump 2, the other port is connected to the tank 3, The remaining one port is connected to electromagnetic valves 7a and 7b, and two electric pressure control valves 12 are arranged in the piping 11, respectively.

上記構成において、手動操作する場合には、電磁弁7a
、7bを手動ポートMにして、操作レバー10を運転者
の意図するアクチュエータの速度に合わせて操作する。
In the above configuration, in the case of manual operation, the solenoid valve 7a
, 7b are set to manual ports M, and the operating lever 10 is operated in accordance with the speed of the actuator intended by the driver.

この操作レバー】口の操作量に応じて所定の圧力がメイ
ンバルブのパイロット室17a、17bに作動し、メ、
インバルブ9の図示しないスプールを所定量だけ作動さ
せ、図示しない油圧ポンプがらの圧油をアクチュエータ
に送る。
A predetermined pressure is applied to the pilot chambers 17a, 17b of the main valve according to the amount of operation of the main valve.
A spool (not shown) of the in-valve 9 is actuated by a predetermined amount, and pressure oil from a hydraulic pump (not shown) is sent to the actuator.

つぎに、電気的操作する場合には、電鍵弁7a7bをラ
ジコン操作ボー1− Nにし、図示しないスイッチを操
作して電気圧力制御弁12のツレ、ノイドにスーイッチ
の操作量に応じて電流を流し、所定の圧力を得る。電気
圧力制御弁12の作動により油圧ポンプ2からの圧油は
作動ポートTを経て、電磁弁7a、7bのラジコン操作
ポートNを経由してメインバルブ9のパイロット室17
a、J7bに作動しメインバルブ9の図示しないスプー
ルを所定量だけ作動させ、図示しない油圧ポンプからの
圧油をアクチュエータに送る。
Next, in the case of electrical operation, set the electric key valve 7a7b to the radio-controlled control button 1-N, operate the switch (not shown), and apply current to the electric pressure control valve 12 according to the operating amount of the switch. , obtain a predetermined pressure. Due to the operation of the electric pressure control valve 12, the pressure oil from the hydraulic pump 2 passes through the operation port T, and the radio-controlled operation port N of the solenoid valves 7a and 7b to the pilot chamber 17 of the main valve 9.
a, J7b to operate the spool (not shown) of the main valve 9 by a predetermined amount, and send pressure oil from a hydraulic pump (not shown) to the actuator.

(発明が解決しようとする課題) しかしながら、上記従来の建設機械の油圧回路では、手
動と電気的操作の切換のために電磁弁がアクチュエータ
毎に2個必要である。また、電気圧力制御弁からタンク
への配管、電気圧力制御弁から電磁弁への配管が増加す
る。第4図は、基本回路として、前記のように1個のメ
インバルブのみを記載したが、油圧ショベルの場合には
。ブーム、アーム、パケット、旋回、あるいは、走行等
の多数のメインバルブがあるため、部品点数が増加し、
場積が大きくなるとともに、組立工数の増大、コストが
増加するという問題がある。
(Problems to be Solved by the Invention) However, in the conventional hydraulic circuit of the construction machine described above, two solenoid valves are required for each actuator in order to switch between manual and electrical operation. Additionally, the number of piping from the electric pressure control valve to the tank and from the electric pressure control valve to the solenoid valve increases. Although FIG. 4 shows only one main valve as the basic circuit as described above, in the case of a hydraulic excavator. Since there are many main valves such as boom, arm, packet, swing, or travel, the number of parts increases.
As the space becomes larger, there is a problem in that the number of assembly steps and costs increase.

本発明は上記従来の問題点に着目し、建設機械の油圧回
路に係わり、特には、油圧パイロット弁による手動操作
の回路に、電気制御弁を加え、自動運転や、ラジコン(
リモコン)操作のよウナ!気的操作も切換可能とする簡
素な建設機械の油圧回路の改良を目的としている。
The present invention focuses on the above-mentioned conventional problems, and relates to hydraulic circuits for construction machinery. In particular, the present invention adds an electric control valve to a manually operated circuit using a hydraulic pilot valve to enable automatic operation, radio-controlled (
(Remote Control) Operation Una! The purpose of this project is to improve the hydraulic circuit of simple construction machinery by making it possible to switch between hydraulic operations.

(課題を解決するための手段) 上記目的を達成するためには、本発明に係わる発明では
油圧パイロット弁とメインバルブのパイロットポートの
間に電気圧力制御弁のタンクポートを油圧パイロット弁
側に、シグナルポートをメインバルブのパイロットポー
トに接続し、電気圧力制御弁のポンプポートをパイロッ
ト油圧源に接続することにより、油圧パイロット弁によ
る手動操作あるいは電気圧力制御弁による操作を行う。
(Means for Solving the Problem) In order to achieve the above object, in the invention according to the present invention, the tank port of the electric pressure control valve is placed on the hydraulic pilot valve side between the hydraulic pilot valve and the pilot port of the main valve. By connecting the signal port to the pilot port of the main valve and connecting the pump port of the electric pressure control valve to a pilot hydraulic power source, manual operation using the hydraulic pilot valve or operation using the electric pressure control valve is performed.

(作用) 上記構成によれば、電気圧力制御弁には油圧パイロット
弁と電気圧力制御弁を直列に接続するポートと、油圧ポ
ンプから圧油を並列に受けるポートとを設けているため
、油圧パイロット弁と電気圧力制御弁をそれぞれ個別に
操作することでメインバルブを駆動することができ、電
磁弁が不要になる。また、油圧パイロット弁を優先に使
用しているために電気圧力制御弁により自動操作中でも
、油圧パイロット弁を操作することにより自動操作から
手動操作に切り換えることができる。
(Function) According to the above configuration, the electric pressure control valve is provided with a port that connects the hydraulic pilot valve and the electric pressure control valve in series, and a port that receives pressure oil from the hydraulic pump in parallel. The main valve can be driven by operating the valve and the electric pressure control valve individually, eliminating the need for a solenoid valve. Moreover, since the hydraulic pilot valve is used preferentially, even when automatic operation is being performed by the electric pressure control valve, automatic operation can be switched to manual operation by operating the hydraulic pilot valve.

(実施例) 以下に、本発明にかかわる建設機械の油圧回路の実施例
につき、図面を参照して詳細に説明する。第1図は本発
明の第1実施例の油圧回路図である。なお、従来技術の
第4図と同一部品は同一符号を付し説明を省略する。第
1図において、エンジン、モータ等の駆動源1には、図
示しない建設機械の作業機を駆動する油圧、;ミンブ3
1と、作業機を操作する切換弁等の操作用の油圧ポンプ
2とが連結されている。油圧ポンプ31からの圧油は、
配管32を経て、メインバルブ9で中立ポート9aから
駆動ポート9b、9cに切り換えられて、配管33a、
33bを経てアクチュエータ34に行き、作業機を作動
する。操作回路は、従来と同一の手で手動する手動操作
回路Aと、電気的操作回路Cと、からなる。手で手動す
る手動操作回路Aを用いる場合には、駆動源1により駆
動される油圧ポンプ2がタンク3より油を吸引し、配管
4、油圧パイロット弁5、配管6a、6 b 、、 を
気圧力制御弁41a、41b、配管42a、42bを介
して、メインバルブ9に供給するが、油圧パイロ−1・
l・弁5の操作レバー10を手で操作することにより行
う。電気的操作回路Cを用いる場合には、油圧ポンプ2
からの圧油は配管4から分岐された配管43、電気圧力
制御弁41a、41b。
(Example) Hereinafter, an example of a hydraulic circuit for a construction machine according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a hydraulic circuit diagram of a first embodiment of the present invention. Incidentally, the same parts as in FIG. 4 of the prior art are given the same reference numerals, and explanations thereof will be omitted. In FIG. 1, a drive source 1 such as an engine or a motor includes a hydraulic pressure for driving a working machine of a construction machine (not shown);
1 is connected to a hydraulic pump 2 for operating a switching valve or the like for operating a working machine. The pressure oil from the hydraulic pump 31 is
Via the piping 32, the main valve 9 switches from the neutral port 9a to the drive ports 9b, 9c, and the piping 33a,
33b to the actuator 34 to operate the working machine. The operating circuit consists of a manual operating circuit A, which is operated manually as in the conventional case, and an electrical operating circuit C. When using manual operation circuit A, a hydraulic pump 2 driven by a drive source 1 sucks oil from a tank 3, and airs a pipe 4, a hydraulic pilot valve 5, and pipes 6a, 6b, . It is supplied to the main valve 9 via the pressure control valves 41a, 41b and piping 42a, 42b, but the hydraulic pyro-1.
This is done by manually operating the operating lever 10 of the valve 5. When using the electrical operation circuit C, the hydraulic pump 2
Pressure oil is supplied from a pipe 43 branched from the pipe 4, and electric pressure control valves 41a and 41b.

配管42a、42bを介して、メインバルブ9に供給に
供給するが、電気圧力制御弁41a、41bの操作はラ
ジコン、あるいは、コントローラを用いた自動制御の電
気的操作により操作することにより行う。油圧パイロッ
ト弁5は可変減圧弁であり、配管15に配設されたリリ
ーフ弁16の設定圧を減圧して、操作レバー10の操作
量に応じた所定の圧力がメインバルブのパイロット室j
7a、17bに送られている。電気圧力制御弁4】a、
41bは油圧パイロット弁5とメインバルブのパイロッ
トポー)17a、17bの間に挿入されソレノイドに加
えられた電流に比例した圧力を出力し、2位置3ポート
と考えると1位置は手動位置(Q)で他の1位置はラジ
コン位a (R)であり、便宜上3ポートのうちタンク
ポートtを配管6a、6bを介して油圧パイロ・リド左
側に、シグナルポートgを配管42a、42bを介して
メインバルブのパイロットポート則に、ポンプポートp
を配管43を介してパイロット油圧源を接続する。
The main valve 9 is supplied via pipes 42a and 42b, and the electric pressure control valves 41a and 41b are operated by radio control or automatically controlled electrically using a controller. The hydraulic pilot valve 5 is a variable pressure reducing valve, and reduces the set pressure of a relief valve 16 disposed in the piping 15 to maintain a predetermined pressure in accordance with the amount of operation of the operating lever 10 in the pilot chamber of the main valve.
7a and 17b. Electric pressure control valve 4]a,
41b is inserted between the hydraulic pilot valve 5 and the pilot port of the main valve (17a, 17b) and outputs pressure proportional to the current applied to the solenoid. Considering that there are 2 positions and 3 ports, the 1st position is the manual position (Q). The other position is radio control position a (R), and for convenience, tank port t is connected to the left side of the hydraulic pyro lid through piping 6a and 6b, and signal port g is connected to the main side through piping 42a and 42b. According to the valve pilot port rule, pump port p
A pilot hydraulic power source is connected via piping 43.

上記構成において、次に作動を説明する。手動操作する
場合には、電気圧力制御弁41a、41bには信号を送
らずに手動位置Qのままにして、操作レバー10を運転
者の意図するアクチュエータ34の速度に合わせて操作
する。この操作レバー10の操作量に応じて所定の圧力
がメインバルブ9のパイロット室17a、17bに作動
し、メインバルブ9を中立位置9aから駆動ポート9b
あるいは9cに図示しないスプールを所定量だけ作動さ
せ、油圧ポンプ31からの圧油をアクチュエータ34に
送る。
In the above configuration, the operation will be explained next. In the case of manual operation, the electric pressure control valves 41a and 41b are left in the manual position Q without sending any signals, and the control lever 10 is operated in accordance with the speed of the actuator 34 intended by the driver. A predetermined pressure is applied to the pilot chambers 17a, 17b of the main valve 9 according to the amount of operation of the operating lever 10, and the main valve 9 is moved from the neutral position 9a to the drive port 9b.
Alternatively, a spool (not shown) at 9c is actuated by a predetermined amount to send pressurized oil from the hydraulic pump 31 to the actuator 34.

つぎに、電気圧力制御弁4]a、41bによる駆動時は
、油圧パイロット弁5が中立位置にあるため、配管6a
の圧力Paおよび配管6bの圧力Pbはタンクに通じて
いるのでタンク圧Poとなっている。従って、電気圧力
制御弁41aあるいは41bに指令値を出すと、配管4
2aに出力圧Pcあるいは42bに出力圧Pdがその指
令値に応じて出力されメインバルブ9が駆動される。
Next, when the electric pressure control valves 4]a and 41b are driven, since the hydraulic pilot valve 5 is in the neutral position, the piping 6a
Since the pressure Pa of the pipe 6b and the pressure Pb of the pipe 6b communicate with the tank, they become the tank pressure Po. Therefore, when a command value is issued to the electric pressure control valve 41a or 41b, the piping 4
Output pressure Pc is output to 2a or output pressure Pd is output to 42b according to the command value, and the main valve 9 is driven.

このように事業の油圧回路により手動操作、および電気
操作の制御が個別に行われる。さらに、電気圧力制御弁
41a、41bで駆動中に手動操作(油圧パイロット弁
による操作)した場合について述べる。電気圧力制御弁
41aが駆動されてパイロット室17aに圧力Pcが出
力している場合に操作レバー10をW側に倒すと、油圧
パイロット弁5による圧力Paが電気圧力制御弁4ia
による圧力Pc以下の時はPcは電気圧力制御弁の減圧
弁の作用によりPcのままであり、PaがPCより高く
なるとPaがメインバルブ9のパイロット室17aに導
かれる。また、電気圧力制御弁17aが駆動されてパイ
ロット室17aに圧力PCが出力されている時に手動操
作レバーをY側に倒すと、同し量に応じ圧力Pbがパイ
ロj71−室17bに出力され、圧力Pdか圧力Pcと
等しい時にはメインバルブ9は中立位1I9aに戻り、
圧力Pdが圧力Pcより大ぎい時にはメインバルブ9は
駆動位1t9bから90に移動し、アクチュエータ34
は減速するか、停止するか、あるいは、反対力向に作動
する。従って、電気圧力側部″FP41a、41bで駆
動されている場合でも、操作レバー10を操作すると、
油圧パイロット弁5のパイロット油圧が電気圧力制御弁
41a、41bに重畳して出力されるため、コントロー
ラの暴走とか故障時の誤動作に対しても、手動割り込み
操作により危険を回避することが出来る。この機能につ
いては第3図のように油圧ポンプから油圧パイロット弁
Aと電気圧力制御弁Cどの分岐点に電磁弁りを配設する
ことにより手動操作と電気操作を分離し、電気操作中に
手動操作を受付ないようにも出来る。
In this way, manual and electrical operations are controlled separately by the hydraulic circuit of the project. Furthermore, a case will be described in which the electric pressure control valves 41a and 41b are manually operated (operated by a hydraulic pilot valve) while being driven. When the electric pressure control valve 41a is driven and the pressure Pc is output to the pilot chamber 17a, when the operating lever 10 is tilted to the W side, the pressure Pa from the hydraulic pilot valve 5 is changed to the electric pressure control valve 4ia.
When the pressure is below Pc, Pc remains at Pc due to the action of the pressure reducing valve of the electric pressure control valve, and when Pa becomes higher than PC, Pa is guided to the pilot chamber 17a of the main valve 9. Furthermore, when the electric pressure control valve 17a is driven and pressure PC is output to the pilot chamber 17a, if the manual operation lever is tilted to the Y side, pressure Pb is output to the pyro chamber 17b according to the same amount, When the pressure Pd is equal to the pressure Pc, the main valve 9 returns to the neutral position 1I9a,
When the pressure Pd is greater than the pressure Pc, the main valve 9 moves from the drive position 1t9b to 90, and the actuator 34
slows down, stops, or operates in the opposite direction. Therefore, even when driven by the electric pressure side parts "FP41a, 41b, when the operating lever 10 is operated,
Since the pilot oil pressure of the hydraulic pilot valve 5 is output in a superimposed manner to the electric pressure control valves 41a and 41b, danger can be avoided by manual interrupt operation even in the event of runaway of the controller or malfunction at the time of failure. Regarding this function, manual operation and electric operation are separated by installing a solenoid valve at the branch point of the hydraulic pilot valve A and electric pressure control valve C from the hydraulic pump, as shown in Figure 3, and manual operation and electric operation are separated. You can also prevent it from accepting operations.

第2図は油圧ショベルのブーム51、アーム52、バケ
ット53、旋回54の4つのアクチュエータを本発明の
方式により、手動による操作と、電気制御による操作も
行える油圧回路の実施例を示す。なお、必要に応じて、
右走行、左走行、あるいは、その他のアクチュエータの
回路にも適用ができる。
FIG. 2 shows an embodiment of a hydraulic circuit in which four actuators of a hydraulic excavator, including a boom 51, an arm 52, a bucket 53, and a swing 54, can be operated manually or by electrical control according to the method of the present invention. In addition, if necessary,
It can also be applied to right-hand travel, left-hand travel, or other actuator circuits.

(発明の効果) 以上説明したように、本発明によれば、電気圧力制御弁
には油圧パイロット弁と電気圧力制御弁を直列に接続す
るポートと、油圧ポンプから圧油を並列に受けるポート
とを設りたため、油圧パイロット弁あるいは電気圧力制
御弁をそれぞれ個別に操作することでメインバルブを駆
動することができ、電磁弁、配管が不要になるとともに
、場積が小さ(なり、組立工数の減少、並びにコストが
安価になる。また、油圧パイロット弁を優先に使用して
いるために電気圧力制御弁により自tJIN)作中でも
、油圧パイロット弁を操作することにより自動操作から
手動操作に切り換えれる簡素な建設機械の油圧回路が得
られる。
(Effects of the Invention) As explained above, according to the present invention, the electric pressure control valve has a port that connects the hydraulic pilot valve and the electric pressure control valve in series, and a port that receives pressure oil from the hydraulic pump in parallel. As a result, the main valve can be driven by operating the hydraulic pilot valve or electric pressure control valve individually, eliminating the need for solenoid valves and piping, and reducing space requirements (and reducing assembly man-hours). In addition, since the hydraulic pilot valve is used preferentially, the electric pressure control valve allows switching from automatic operation to manual operation by operating the hydraulic pilot valve even during operation. A simple hydraulic circuit for construction machinery can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の第1実施例建設@械の油圧回路図。 第2図は本発明を油圧ショベルのブーム、アーム、パケ
ット、旋回のアクチュエータに用いる油圧回路図。 第3図は本発明の第2実施例建表機械の油圧回路図。 第4図は従来の建設機械の油圧回路図。 ・駆動源、 ■・・・油圧ポンプ、 ・油圧パイロット弁、 ・・リリーフ弁、 17b・・・パイロット室、 41b・・・電気圧力制御弁−。 シグナルポート、 ポンプポー ト、 りニックポート 1 ・ ・ 2、3 5 ・ ・ 16 ・  7 al  1 al g ゛ ゛ p ° ° 。 t ・ ・ ・ 出願人  株式会社 小松製作所
FIG. 1 is a hydraulic circuit diagram of a construction machine according to a first embodiment of the present invention. FIG. 2 is a hydraulic circuit diagram in which the present invention is used in a boom, arm, packet, and swing actuator of a hydraulic excavator. FIG. 3 is a hydraulic circuit diagram of a construction machine according to a second embodiment of the present invention. Figure 4 is a hydraulic circuit diagram of a conventional construction machine. - Drive source, ■... Hydraulic pump, - Hydraulic pilot valve, ... Relief valve, 17b... Pilot chamber, 41b... Electric pressure control valve. Signal port, pump port, nick port 1, 2, 3, 5, 16, 7 al 1 alg ゛ ゛p ° °. t ・ ・ ・ Applicant Komatsu Ltd.

Claims (2)

【特許請求の範囲】[Claims] (1)油圧パイロット弁により、メインバルブのスプー
ルを操作する建設機械の油圧回路において、油圧パイロ
ット弁とメインバルブのパイロットポートの間に電気圧
力制御弁のタンクポートを油圧パイロット弁側に、シグ
ナルポートをメインバルブのパイロットポートに接続し
、電気圧力制御弁のポンプポートをパイロット油圧源に
接続することにより、油圧パイロット弁による手動操作
あるいは電気圧力制御弁による操作を行うことを特徴と
する建設機械の油圧回路。
(1) In the hydraulic circuit of a construction machine that operates the spool of the main valve using a hydraulic pilot valve, the tank port of the electric pressure control valve is connected to the hydraulic pilot valve side between the hydraulic pilot valve and the pilot port of the main valve, and the signal port is connected to the hydraulic pilot valve. A construction machine characterized in that manual operation using a hydraulic pilot valve or operation using an electric pressure control valve is performed by connecting the pump port of the electric pressure control valve to a pilot port of a main valve and the pump port of an electric pressure control valve to a pilot hydraulic power source. Hydraulic circuit.
(2)油圧パイロット弁、あるいは、電気圧力制御弁に
よりメインバルブのスプールを操作する建設機械の油圧
回路において、電気圧力制御弁の1つのポートを油圧パ
イロット弁に、1つのポートをメインバルブのパイロッ
トポートに、残りの1つのポートをパイロット油圧源に
接続する電気圧力制御弁を油圧パイロット弁とメインバ
ルブのパイロットポートとの間に配設することを特徴と
する建設機械の油圧回路。
(2) In a hydraulic circuit of a construction machine that operates the main valve spool using a hydraulic pilot valve or an electric pressure control valve, one port of the electric pressure control valve is used as the hydraulic pilot valve, and one port is used as the main valve pilot valve. A hydraulic circuit for construction machinery, characterized in that an electric pressure control valve connecting one remaining port to a pilot hydraulic pressure source is disposed between a hydraulic pilot valve and a pilot port of a main valve.
JP14057190A 1990-05-30 1990-05-30 Hydraulic circuit for construction machine Pending JPH0434201A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14057190A JPH0434201A (en) 1990-05-30 1990-05-30 Hydraulic circuit for construction machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14057190A JPH0434201A (en) 1990-05-30 1990-05-30 Hydraulic circuit for construction machine

Publications (1)

Publication Number Publication Date
JPH0434201A true JPH0434201A (en) 1992-02-05

Family

ID=15271785

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14057190A Pending JPH0434201A (en) 1990-05-30 1990-05-30 Hydraulic circuit for construction machine

Country Status (1)

Country Link
JP (1) JPH0434201A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05255948A (en) * 1992-03-13 1993-10-05 Kubota Corp Back hoe
JP2011231884A (en) * 2010-04-28 2011-11-17 Hitachi Constr Mach Co Ltd Control device of hydraulic working machine
JP2020002993A (en) * 2018-06-27 2020-01-09 株式会社クボタ Hydraulic system of work machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5222070A (en) * 1975-08-12 1977-02-19 Kuraray Co Polyvinyl chloride compound having improved interface between it and blood or reagent liquor
JPS61277723A (en) * 1985-06-03 1986-12-08 Kobe Steel Ltd Remote control circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5222070A (en) * 1975-08-12 1977-02-19 Kuraray Co Polyvinyl chloride compound having improved interface between it and blood or reagent liquor
JPS61277723A (en) * 1985-06-03 1986-12-08 Kobe Steel Ltd Remote control circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05255948A (en) * 1992-03-13 1993-10-05 Kubota Corp Back hoe
JP2011231884A (en) * 2010-04-28 2011-11-17 Hitachi Constr Mach Co Ltd Control device of hydraulic working machine
JP2020002993A (en) * 2018-06-27 2020-01-09 株式会社クボタ Hydraulic system of work machine

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