JP2608194B2 - Backhoe hydraulic operation structure - Google Patents
Backhoe hydraulic operation structureInfo
- Publication number
- JP2608194B2 JP2608194B2 JP15125791A JP15125791A JP2608194B2 JP 2608194 B2 JP2608194 B2 JP 2608194B2 JP 15125791 A JP15125791 A JP 15125791A JP 15125791 A JP15125791 A JP 15125791A JP 2608194 B2 JP2608194 B2 JP 2608194B2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- control valve
- pilot
- oil passage
- boom
- 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.)
- Expired - Fee Related
Links
Landscapes
- Operation Control Of Excavators (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、バックホー装置のブー
ムを昇降駆動する油圧シリンダの圧油制御用の主制御弁
とは別に副制御弁を設け、各制御弁を油圧パイロット操
作式に構成するとともに、ブームの上昇操作用の油圧パ
イロット操作弁のパイロット油路を、前記各制御弁の上
昇側パイロット油室に接続してあるバックホーの油圧操
作構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a sub-control valve separately from a main control valve for controlling a hydraulic oil of a hydraulic cylinder for driving a boom of a backhoe apparatus up and down, and each control valve is constituted by a hydraulic pilot operation type. In addition, the present invention relates to a hydraulic operating structure of a backhoe in which a pilot oil passage of a hydraulic pilot operation valve for raising a boom is connected to an upward pilot oil chamber of each control valve.
【0002】[0002]
【従来の技術】上記バックホーの油圧操作構造におい
て、従来では、前記副制御弁のブーム下降操作用の油圧
パイロット操作弁のパイロット油路は、ドレン油路に接
続した状態で固定されていた。2. Description of the Related Art In the above-mentioned hydraulic operating structure of a backhoe, conventionally, a pilot oil passage of a hydraulic pilot operation valve for boom lowering operation of the sub-control valve is fixed while being connected to a drain oil passage.
【0003】[0003]
【発明が解決しようとする課題】上記従来構造は、掘削
作業する場合に、ブームの上昇速度を高速にさせ作業能
率を向上させるために、主油圧ポンプから主制御弁を介
して供給される圧油に加えて、他の油圧ポンプからの圧
油を副制御弁を介して合流するようにしたものであり、
又、ブームの下降作動の場合には、油圧操作力に対して
バックホー装置の大きな重量が加わるので、上昇操作と
同様に圧油を合流させると、速度が速くなり過ぎて、下
降中に停止した場合には大きなショックが生じるおそれ
が大で作業上危険であるから、下降時にはブーム操作速
度の増速は行わないようにしたものである。ところが、
バックホー装置においては、土砂等の掘削作業だけでな
く、例えば先端部のバケットに代えてブレーカを装着し
てコンクリートの破壊作業を行うような場合があり、こ
のような作業のときは、下降速度が遅くなって、却って
作業能率が悪いものになる欠点があった。本発明は、油
圧パイロット操作式の利点を有効に活かしながら、簡単
な構造改良で上記不具合点を解消することを目的として
いる。The above-mentioned conventional structure has a structure in which the pressure supplied from the main hydraulic pump via the main control valve is increased in excavation work in order to increase the boom ascending speed and improve work efficiency. In addition to oil, pressure oil from another hydraulic pump is joined via the sub-control valve,
Also, in the case of the lowering operation of the boom, since the backhoe device adds a large weight to the hydraulic operating force, when the hydraulic oil is joined in the same manner as the raising operation, the speed becomes too fast, and the vehicle stops during the lowering operation. In such a case, a large shock is likely to occur, which is dangerous for work. Therefore, the speed of the boom operation is not increased when the vehicle descends. However,
In the backhoe device, not only excavation work such as earth and sand, but also, for example, there is a case where a breaker is installed in place of a bucket at the tip to break concrete, and in such an operation, the descent speed is reduced. There was a disadvantage that the work became slower and the work efficiency became worse. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems with a simple structure improvement while effectively utilizing the advantages of the hydraulic pilot operation type.
【0004】[0004]
【課題を解決するための手段】本発明の特徴構成は、冒
頭に記載したバックホーの油圧操作構造において、前記
副制御弁のブーム下降側パイロット油室に連通する下降
側パイロット油路を、ドレン油路に接続する状態と、前
記主制御弁の下降操作用の油圧パイロット操作弁のパイ
ロット油路に分流用部材を介して接続する状態とに切り
換え自在に設けてある点にある。According to a feature of the present invention, in the hydraulic operating structure of the backhoe described at the beginning, the descending pilot oil passage communicating with the boom descending pilot oil chamber of the sub control valve is provided with a drain oil. It is provided so as to be freely switchable between a state in which it is connected to a passage and a state in which it is connected to a pilot oil passage of a hydraulic pilot operation valve for lowering the main control valve via a flow dividing member.
【0005】[0005]
【作用】ブームの下降速度を高速にする必要がない作業
を行う場合には、副制御弁のブーム下降操作用パイロッ
ト油路をドレン油路に接続しておくことで、下降操作時
には、主制御弁のみ操作され、圧油の合流がなく、比較
的低速でブームが下降する。又、コンクリート破壊作業
や杭打ち作業あるいはバケットによる盛土の叩き整地作
業等のようにブームを高速で下降させる必要があるよう
な場合には、副制御弁のブーム下降操作用パイロット油
路を主制御弁の下降操作用パイロット油路に分流用部材
を介して接続することで、下降操作時においても、主制
御弁のみならず副制御弁の操作に従って圧油が合流供給
されて高速で操作されることになる。When the boom lowering speed does not need to be increased, the pilot oil passage for the boom lowering operation of the sub-control valve is connected to the drain oil passage. Only the valve is operated, the pressure oil does not merge, and the boom descends at a relatively low speed. Also, when it is necessary to lower the boom at a high speed, such as in concrete breaking work, pile driving work, or ground leveling work with a bucket, the main control of the pilot oil passage for the boom lowering operation of the secondary control valve is performed. By connecting to the pilot oil passage for lowering operation of the valve via a diverting member, even at the time of lowering operation, pressure oil is merged and supplied according to the operation of not only the main control valve but also the sub-control valve to operate at high speed. Will be.
【0006】[0006]
【発明の効果】従って、副制御弁のブーム下降操作用パ
イロット油路を、ドレン油路あるいは分流用部材のいず
れかに接続切り換えするだけの構造で済むので、現行の
油圧構造の簡易な改良だけで対応することができて、特
殊な作業であっても作業性に優れたバックホーを提供で
きることとなった。As described above, a structure in which the pilot oil passage for the boom lowering operation of the sub-control valve is simply connected and switched to either the drain oil passage or the branching member is sufficient, so that only a simple improvement of the existing hydraulic structure can be achieved. This makes it possible to provide a backhoe with excellent workability even for special tasks.
【0007】[0007]
【実施例】以下、実施例を図面に基いて説明する。図3
にバックホーを示している。このバックホーは、左右一
対の油圧モータM1,M2により駆動されるクローラ走
行装置1を備えた走行機台2の上部に、旋回モータM3
により縦軸芯周りで全旋回自在に旋回台3を搭載し、こ
の旋回台3に原動部4、操縦部5を配設するとともに、
スイングシリンダC1の駆動によりスイングブラケット
6を介して縦軸芯周りで格納揺動自在にバックホー装置
7を連結してある。このバックホー装置7は、ブーム
8、アーム9及びバケット10から成り、夫々、ブーム
シリンダC2、アームシリンダC3、バケットシリンダ
C4により揺動駆動して掘削作業を行えるよう構成して
ある。Embodiments will be described below with reference to the drawings. FIG.
Shows the backhoe. The backhoe is provided with a turning motor M3 on an upper part of a traveling machine base 2 provided with a crawler traveling device 1 driven by a pair of left and right hydraulic motors M1 and M2.
The swivel 3 is mounted so that the swivel 3 can freely rotate around the vertical axis, and the driving unit 4 and the control unit 5 are arranged on the swivel 3.
A backhoe device 7 is connected via a swing bracket 6 so that it can be stored and oscillated about a longitudinal axis via a swing bracket 6 by driving a swing cylinder C1. The backhoe device 7 includes a boom 8, an arm 9, and a bucket 10, and is configured to be able to perform an excavation operation by swinging drive by a boom cylinder C2, an arm cylinder C3, and a bucket cylinder C4, respectively.
【0008】次に油圧回路構造について説明する。図1
に示すように、スイングシリンダ用油圧制御弁V1、旋
回モータ用油圧制御弁V2等をセンターバイパス型多連
弁に構成し、これらに対して第1油圧ポンプP1から圧
油を供給し、バケットシリンダ用油圧制御弁V3、ブー
ム8の主油圧制御弁V4、右側走行油圧モータ用油圧制
御弁V5夫々をセンターバイパス型多連弁に構成し、こ
れらに対して第2油圧ポンプP2から圧油を供給し、左
側走行油圧モータ用油圧制御弁V6、ブーム8の副油圧
制御弁V7、アームシリンダ用油圧制御弁V8等をセン
ターバイパス型多連弁に構成し、これらに対して第3油
圧ポンプP3から圧油を供給するよう油圧回路を構成し
てある。そして、バックホー装置7の駆動用各制御弁V
3,V4,V7,V8、旋回制御弁V2及びスイングシ
リンダ用制御弁V1の夫々を油圧パイロット操作式に構
成し、これらは左右一対の十字揺動式操作レバー11
R,11Lの操作により制御される。つまり、一方の操
作レバー11Rの所定方向の操作で油圧パイロット操作
弁PV1,PV2を介してアームシリンダC3を操作
し、他方向の操作で油圧パイロット操作弁PV3,PV
4を介して旋回モータM3あるいはスイングシリンダC
1を操作するよう油圧パイロット操作系を構成し、他方
の操作レバー11Lの所定方向の操作で、油圧パイロッ
ト操作弁PV5,PV6を介してブームシリンダC2を
操作し、他方向の操作で油圧パイロット操作弁PV7,
PV8を介してバケットシリンダC4を操作するよう油
圧パイロット操作系を構成してある。尚、旋回モータM
3とスイングシリンダC1の使い分けは切換弁12によ
り行う。Next, the hydraulic circuit structure will be described. FIG.
As shown in the figure, the hydraulic control valve V1 for the swing cylinder, the hydraulic control valve V2 for the swing motor, and the like are configured as a center bypass type multiple valve, and hydraulic oil is supplied from the first hydraulic pump P1 to these valves. Hydraulic control valve V3, the main hydraulic control valve V4 of the boom 8, and the hydraulic control valve V5 for the right traveling hydraulic motor are each configured as a center bypass type multiple valve, to which hydraulic oil is supplied from the second hydraulic pump P2. Then, the hydraulic control valve V6 for the left traveling hydraulic motor, the auxiliary hydraulic control valve V7 of the boom 8, the hydraulic control valve V8 for the arm cylinder, and the like are configured as a center bypass type multiple valve. A hydraulic circuit is configured to supply pressure oil. Then, each control valve V for driving the backhoe device 7
3, V4, V7, V8, the swing control valve V2 and the swing cylinder control valve V1 are each configured as a hydraulic pilot operation type, and these are a pair of left and right cross swing operation levers 11.
It is controlled by the operation of R and 11L. That is, the arm cylinder C3 is operated via the hydraulic pilot operation valves PV1 and PV2 by operation of the one operation lever 11R in a predetermined direction, and the hydraulic pilot operation valves PV3 and PV are operated by operation in the other direction.
4, the swing motor M3 or the swing cylinder C
1 is operated, the boom cylinder C2 is operated via the hydraulic pilot operation valves PV5, PV6 by operating the other operation lever 11L in a predetermined direction, and the hydraulic pilot operation is operated by operating in the other direction. Valve PV7,
A hydraulic pilot operation system is configured to operate the bucket cylinder C4 via the PV8. Note that the swing motor M
The switching valve 12 selectively uses the swing cylinder C1 and the swing cylinder C1.
【0009】そして、ブーム8の上昇操作用の油圧パイ
ロット操作弁PV5のパイロット油路L1を、前記主油
圧制御弁V4及び副油圧制御弁V7の上昇側パイロット
油室に接続してある。前記副制御弁V7のブーム下降側
パイロット油室に連通する下降側パイロット油路L2
を、ドレン油路L3に接続する状態と、前記主制御弁V
4の下降操作用のパイロット油路L4に分流用接手13
(分流用部材の一例)を介して接続する状態とに切り換
え自在に設けてある。詳述すると、図2に示すように、
副制御弁V7のブーム下降側パイロット油路L2を可撓
性のホース14で構成し、このホース14の他端側をド
レン油路L3を構成するドレンパイプ15に形成した接
続部16にネジ込み接続する状態と、主制御弁V4の下
降操作用パイロット油路L4の途中部に設けた分流用接
手13にネジ込み接続する状態とに付け替えできるよう
構成してある。尚、ドレン油路L3に接続するときに
は、前記分流用接手13の接続箇所は袋ナット等で塞
ぎ、又、分流用接手13に接続するときには、ドレンパ
イプ15の接続部16は袋ナット等で塞ぐのである。こ
のように構成すると、ブーム8の下降操作の際に、2つ
の油圧ポンプP2,P3からの圧油を合流して高速で下
降させることができる状態と、1つの油圧ポンプP2か
らの圧油だけが供給される低速操作状態とに容易に切り
換えることができる。The pilot oil passage L1 of the hydraulic pilot operation valve PV5 for raising the boom 8 is connected to the rising pilot oil chamber of the main hydraulic control valve V4 and the auxiliary hydraulic control valve V7. A descending pilot oil passage L2 communicating with the boom descending pilot oil chamber of the sub control valve V7.
Is connected to the drain oil passage L3 and the main control valve V
Diverting joint 13 in the pilot oil passage L4 for lowering operation 4
It is provided so as to be freely switchable to a state of connection via (an example of a flow dividing member). Specifically, as shown in FIG.
The boom lowering pilot oil passage L2 of the sub-control valve V7 is constituted by a flexible hose 14, and the other end of the hose 14 is screwed into a connection portion 16 formed in a drain pipe 15 constituting a drain oil passage L3. The connection state and the state where the main control valve V4 is screwed and connected to the branching joint 13 provided in the middle of the lowering pilot oil passage L4 of the main control valve V4 can be replaced. When connecting to the drain oil passage L3, the connecting portion of the branching joint 13 is closed with a cap nut or the like, and when connecting to the branching joint 13, the connecting portion 16 of the drain pipe 15 is closed with a cap nut or the like. It is. With such a configuration, when the boom 8 is lowered, the pressure oils from the two hydraulic pumps P2 and P3 can be combined and lowered at high speed, and only the pressure oil from one hydraulic pump P2 can be lowered. Can be easily switched to the low-speed operation state in which is supplied.
【0010】〔別実施例〕上記したように、前記副制御
弁V7のブーム下降側パイロット油路L2を可撓性のホ
ース14で構成するものに代えて、当該パイロット油路
L2に、前記分流用接手13に接続する状態とドレン油
路L3に接続する状態に切り換え自在な簡易な油路切換
具を設けるものでもよい。Alternative Embodiment As described above, the boom-lowering-side pilot oil passage L2 of the sub-control valve V7 is replaced with a flexible hose 14 and is connected to the pilot oil passage L2. A simple oil passage switching tool that can be switched between a state of connection to the diversion joint 13 and a state of connection to the drain oil passage L3 may be provided.
【0011】尚、特許請求の範囲の項に図面との対照を
容易にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。[0011] In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.
【図1】油圧回路図FIG. 1 is a hydraulic circuit diagram
【図2】油路切り換え部の側面図FIG. 2 is a side view of an oil passage switching unit.
【図3】バックホーの全体側面図FIG. 3 is an overall side view of the backhoe.
7 バックホー装置 8 ブーム 13 分流用部材 L1,L2,L4 パイロット油路 L3 ドレン油路 PV5,PV6 油圧パイロット操作弁 V4 主制御弁 V7 副制御弁 7 Backhoe device 8 Boom 13 Dividing member L1, L2, L4 Pilot oil passage L3 Drain oil passage PV5, PV6 Hydraulic pilot operation valve V4 Main control valve V7 Secondary control valve
Claims (1)
昇降駆動する油圧シリンダ(C2)の圧油制御用の主制
御弁(V4)とは別に副制御弁(V7)を設け、各制御
弁(V4),(V7)を油圧パイロット操作式に構成す
るとともに、ブーム(8)の上昇操作用の油圧パイロッ
ト操作弁(PV5)のパイロット油路(L1)を、前記
各制御弁(V4),(V7)の上昇側パイロット油室に
接続してあるバックホーの油圧操作構造であって、前記
副制御弁(V7)のブーム下降側パイロット油室に連通
する下降側パイロット油路(L2)を、ドレン油路(L
3)に接続する状態と、前記主制御弁(V4)の下降操
作用の油圧パイロット操作弁(PV6)のパイロット油
路(L4)に分流用部材(13)を介して接続する状態
とに切り換え自在に設けてあるバックホーの油圧操作構
造。An auxiliary control valve (V7) is provided separately from a main control valve (V4) for controlling hydraulic oil of a hydraulic cylinder (C2) that drives a boom (8) of a backhoe device (7) up and down. The valves (V4) and (V7) are configured as a hydraulic pilot operated type, and the pilot oil passage (L1) of the hydraulic pilot operated valve (PV5) for raising the boom (8) is connected to the control valve (V4). , (V7), the hydraulic operating structure of the backhoe connected to the rising pilot oil chamber, wherein the lower pilot oil passage (L2) communicating with the boom lowering pilot oil chamber of the sub-control valve (V7) is connected. , Drain oil passage (L
3) and a state in which the main control valve (V4) is connected to a pilot oil passage (L4) of a hydraulic pilot operation valve (PV6) for lowering the main control valve (V4) via a flow dividing member (13). Hydraulic operation structure of backhoe freely provided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15125791A JP2608194B2 (en) | 1991-06-24 | 1991-06-24 | Backhoe hydraulic operation structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15125791A JP2608194B2 (en) | 1991-06-24 | 1991-06-24 | Backhoe hydraulic operation structure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH051435A JPH051435A (en) | 1993-01-08 |
JP2608194B2 true JP2608194B2 (en) | 1997-05-07 |
Family
ID=15514714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15125791A Expired - Fee Related JP2608194B2 (en) | 1991-06-24 | 1991-06-24 | Backhoe hydraulic operation structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2608194B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100734350B1 (en) * | 2000-12-23 | 2007-07-03 | 엘지전자 주식회사 | device for displaying screen of color cathode ray tube |
-
1991
- 1991-06-24 JP JP15125791A patent/JP2608194B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH051435A (en) | 1993-01-08 |
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Legal Events
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LAPS | Cancellation because of no payment of annual fees |