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JP5802338B2 - Drive control system for construction equipment work equipment - Google Patents

Drive control system for construction equipment work equipment Download PDF

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Publication number
JP5802338B2
JP5802338B2 JP2014534449A JP2014534449A JP5802338B2 JP 5802338 B2 JP5802338 B2 JP 5802338B2 JP 2014534449 A JP2014534449 A JP 2014534449A JP 2014534449 A JP2014534449 A JP 2014534449A JP 5802338 B2 JP5802338 B2 JP 5802338B2
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control valve
boom
drive
control
bucket
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JP2014534386A (en
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ヘギュン ジョン
ヘギュン ジョン
ヨンボク ソン
ヨンボク ソン
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ボルボ コンストラクション イクイップメント アーベー
ボルボ コンストラクション イクイップメント アーベー
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    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover valves
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • 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
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/123—Drives or control devices specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3133—Regenerative position connecting the working ports or connecting the working ports to the pump, e.g. for high-speed approach stroke

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

Description

本発明は、建設機械用作業装置の駆動制御システムに係り、さらに詳しくは、作動圧力が異なる作業装置を同時に操作するとき（例えば、掘削機のブームとバケットなどの作業装置とを同時に駆動させることをいう）、並列（ｐａｒａｌｌｅｌ）流路と直列（ｔａｎｄｅｍ）流路とを同時に使用できるように流量を制御して制御弁内の圧力ロスを低減させるようにした建設機械用作業装置の駆動制御システムに関する。   The present invention relates to a drive control system for a construction machine work device, and more specifically, when simultaneously operating work devices having different operating pressures (for example, simultaneously driving a work device such as a boom and a bucket of an excavator). A drive control system for a construction machine working device that reduces the pressure loss in the control valve by controlling the flow rate so that a parallel flow channel and a tandem flow channel can be used simultaneously. About.

図１に示すように、従来の技術による建設機械用ブーム駆動制御システムは、
エンジン１と、
エンジン１に接続される可変容量型第１及び第２油圧ポンプ２、３（以下、「第１及び第２油圧ポンプ」と称する）並びにパイロットポンプ４と、
第１油圧ポンプ２の第１センターバイパス通路５に配設されて並列流路５ａにそれぞれ接続され、旋回モータ６の駆動を制御する旋回制御弁７と、アームシリンダ８の駆動を制御するアーム制御弁９と、左側走行モータ１０の駆動を制御する走行制御弁１１と、
第２油圧ポンプ３の第２センターバイパス通路１２に配設されて並列流路１２ａにそれぞれ接続され、ブームシリンダ１３の駆動を制御するブーム制御弁１４と、バケットシリンダ１５の駆動を制御するバケット制御弁１６と、右側走行モータ１７の駆動を制御する走行制御弁１８と、
操作量に対応する制御信号を出力する圧力発生装置１９、２０と、を備える。 As shown in FIG. 1, a conventional boom drive control system for construction machinery is
Engine 1 and
Variable displacement first and second hydraulic pumps 2 and 3 (hereinafter referred to as “first and second hydraulic pumps”) connected to the engine 1 and a pilot pump 4;
A swing control valve 7 disposed in the first center bypass passage 5 of the first hydraulic pump 2 and connected to the parallel flow path 5a and controlling the drive of the swing motor 6, and an arm control controlling the drive of the arm cylinder 8. A travel control valve 11 for controlling the drive of the valve 9 and the left travel motor 10;
A boom control valve 14 disposed in the second center bypass passage 12 of the second hydraulic pump 3 and connected to the parallel flow path 12a to control the drive of the boom cylinder 13, and a bucket control to control the drive of the bucket cylinder 15. A travel control valve 18 for controlling the driving of the right travel motor 17;
Pressure generating devices 19 and 20 that output control signals corresponding to the operation amount.

上述した圧力発生装置１９が中立位置に置かれているとき、第２油圧ポンプ３から吐き出される作動油は第２センターバイパス通路１２及び戻り流路２１を通過して油圧タンクＴに戻る。   When the pressure generator 19 described above is placed at the neutral position, the hydraulic oil discharged from the second hydraulic pump 3 passes through the second center bypass passage 12 and the return passage 21 and returns to the hydraulic tank T.

ブームを上昇させるために圧力発生装置１９を操作するとき、パイロットポンプ４からのパイロット信号圧が圧力発生装置１９を経てブーム制御弁１４に供給される。これにより、ブーム制御弁１４がブーム上昇位置に切り換えられる（図中の左側方向に切り換えられる）ため、第２油圧ポンプ３から吐き出される作動油はロードチェック弁２２及びブーム制御弁１４を経てブームシリンダ１３の大チャンバに供給される。これと同時に、ブームシリンダ１３の小チャンバから流出する作動油はブーム制御弁１４を経て油圧タンクＴに戻る。したがって、ブームシリンダ１３が伸張駆動するのでブームを上昇させることができる。   When operating the pressure generator 19 to raise the boom, the pilot signal pressure from the pilot pump 4 is supplied to the boom control valve 14 via the pressure generator 19. As a result, the boom control valve 14 is switched to the boom raising position (switched to the left side in the figure), so that the hydraulic oil discharged from the second hydraulic pump 3 passes through the load check valve 22 and the boom control valve 14 and is boom cylinder. To 13 large chambers. At the same time, the hydraulic oil flowing out from the small chamber of the boom cylinder 13 returns to the hydraulic tank T via the boom control valve 14. Therefore, since the boom cylinder 13 is driven to extend, the boom can be raised.

一方、ブームを下降するために圧力発生装置１９をブームダウン位置に操作するとき、パイロットポンプ４からのパイロット信号圧が圧力発生装置１９を経て、ブーム制御弁１４を図中の右側方向に切り換える。このため、第２油圧ポンプ３から吐き出される作動油は、ブーム制御弁１４を経てブームシリンダ１３の小チャンバに供給される。これと同時に、ブームシリンダ１３の大チャンバから流出する作動油は、ブーム制御弁１４及び背圧チェック弁２３を経て油圧タンクＴに戻る。したがって、ブームシリンダ１３が収縮駆動されるのでブームを下降することができる。   On the other hand, when the pressure generator 19 is operated to the boom down position in order to lower the boom, the pilot signal pressure from the pilot pump 4 switches the boom control valve 14 in the right direction in the figure through the pressure generator 19. For this reason, the hydraulic oil discharged from the second hydraulic pump 3 is supplied to the small chamber of the boom cylinder 13 through the boom control valve 14. At the same time, the hydraulic oil flowing out from the large chamber of the boom cylinder 13 returns to the hydraulic tank T through the boom control valve 14 and the back pressure check valve 23. Therefore, since the boom cylinder 13 is driven to contract, the boom can be lowered.

このとき、上述した背圧チェック弁２３には弁ばねが取り付けられることにより、流量が通過すると所定の圧力が形成される。なお、ブーム制御弁１４には再生ラインが配設されることにより、ブームダウン時にブームシリンダ１３の大チャンバから流出する流量を小チャンバに再生することができる。   At this time, a valve spring is attached to the back pressure check valve 23 described above, so that a predetermined pressure is formed when the flow rate passes. In addition, the boom control valve 14 is provided with a regeneration line, so that the flow out of the large chamber of the boom cylinder 13 when the boom is down can be regenerated into the small chamber.

上述したようにブームをダウンさせるとき、ブームが自重によってダウンするため低圧力が働くことになる。一方、ブームダウン作動と相対的に高い圧力が求められる作業装置（例えば、バケットをいう）の作動を同時に操作する場合、ブームとバケットの同時操作性を維持するためにブーム下降側制御スプール（ブーム制御弁１４をいう）の流量流入口側に絞り装置（ｔｈｒｏｔｔｌｅ ｄｅｖｉｃｅ）を配設する。   As described above, when the boom is lowered, the boom is lowered by its own weight, so that a low pressure is applied. On the other hand, when simultaneously operating the operation of a working device (for example, a bucket) that requires a relatively high pressure and the boom down operation, a boom lowering control spool (boom) is used to maintain simultaneous operation of the boom and the bucket. A throttle device is provided on the flow inlet side of the control valve 14.

一方、ブームを上昇させる圧力に比べて、相対的に低圧で作動する各作業装置の並列流路に絞り装置を配設することにより、ブーム上昇と他の作業装置の同時操作性を実現することが可能になる。   On the other hand, by providing a throttling device in the parallel flow path of each working device that operates at a relatively low pressure compared to the pressure that raises the boom, simultaneous operation of the boom raising and other working devices is realized. Is possible.

また、上述したブーム制御弁１４と並列に接続されるバケット制御弁１６及び走行制御弁１８には、第２センターバイパス通路１２を介して直列流路が形成されている。すなわち、バケットシリンダ１５の駆動を単独で制御するとき、第２油圧ポンプ３からの作動油は並列流路１２ａ及び直列流路を介して流れ込むことにより、並列流路１２ａにのみ通過させるときに発生する過度な圧力ロスを低減することが可能になる。   Further, a series flow path is formed through the second center bypass passage 12 in the bucket control valve 16 and the travel control valve 18 connected in parallel with the boom control valve 14 described above. That is, when the drive of the bucket cylinder 15 is controlled independently, the hydraulic oil from the second hydraulic pump 3 flows through the parallel flow path 12a and the serial flow path, and is caused to pass only through the parallel flow path 12a. It is possible to reduce excessive pressure loss.

一方、ブーム下降操作とバケットなどの作業装置の操作を同時に行うとき、ブーム下降側制御スプールによって第２センターバイパス通路１２が閉止され、バケットシリンダ１５への作動油の供給通路は、並列流路１２ａのみとなる。この場合、並列流路１２ａに配設される有線制御弁によって十分な流路を確保することができないため過大な圧力ロスを招き、エネルギーロスにつながるという問題点がある。   On the other hand, when the boom lowering operation and the operation of the working device such as the bucket are performed simultaneously, the second center bypass passage 12 is closed by the boom lowering side control spool, and the hydraulic oil supply passage to the bucket cylinder 15 is connected to the parallel flow passage 12a. It becomes only. In this case, since a sufficient flow path cannot be secured by the wired control valve disposed in the parallel flow path 12a, an excessive pressure loss is caused, resulting in an energy loss.

さらに、上述した並列流路１２ａの絞り装置２４として可変制御弁（図２参照）を配設することもあるが、このような絞り装置２４も流路を十分に確保するのに制限があるのが現状である。   Furthermore, a variable control valve (see FIG. 2) may be provided as the throttle device 24 of the parallel flow path 12a described above, but such a throttle device 24 is also limited in securing a sufficient flow path. Is the current situation.

本発明は、ブームダウン作動とバケット駆動のように作動圧力が異なる作業装置を同時に操作するとき、並列流路及び直列流路を介してバケット制御弁に作動油を流れ込ませて制御弁の内部に発生する不要な圧力ロスを低減することにより、エネルギーロスを低減させて油圧システムの効率を増大させるようにした建設機械用作業装置の駆動制御システムを提供することにその目的がある。   The present invention allows operation oil to flow into the bucket control valve via the parallel flow path and the serial flow path when operating work devices having different operation pressures such as boom down operation and bucket drive at the same time. It is an object of the present invention to provide a drive control system for a construction machine working device that reduces energy loss and increases the efficiency of a hydraulic system by reducing unnecessary pressure loss.

本発明の実施形態による建設機械用作業装置の駆動制御システムは、
エンジンと、
エンジンに接続される可変容量型第１及び第２油圧ポンプ並びにパイロットポンプと、
第１油圧ポンプの第１センターバイパス通路に配設されて並列流路にそれぞれ接続され、旋回モータの駆動を制御する旋回制御弁と、アームシリンダの駆動を制御するアーム制御弁と、左側走行モータの駆動を制御する走行制御弁と、
第２油圧ポンプの第２センターバイパス通路に配設されて並列流路にそれぞれ接続され、ブームシリンダの駆動を制御するブーム制御弁と、バケットシリンダの駆動を制御するバケット制御弁と、右側走行モータの駆動を制御する走行制御弁と、
操作量に対応する制御信号を出力する圧力発生装置と、
ブーム制御弁のブーム下降側制御スプールに形成され、圧力発生装置の操作によりブームをダウンさせるようにブーム制御弁を切り換えるときにも、第２センターバイパス通路を閉止することなく開放状態を維持するブリード流路（ｂｌｅｅｄ ｆｌｏｗ ｐａｔｈ）と、
第２センターバイパス通路の最下流側に配設され、ブーム制御弁を切り換える制御信号圧によって切り換えられるセンターバイパス切換弁と、を備えて、
ブームダウン作動と相対的に作動圧力の高い作業装置の作動とを同時に操作するとき、第２油圧ポンプからの作動油が第２センターバイパス通路に接続される並列流路及び直列流路を介してバケット制御弁に流れ込む。 A drive control system for a construction machine working device according to an embodiment of the present invention includes:
Engine,
Variable displacement first and second hydraulic pumps and pilot pumps connected to the engine;
A swing control valve disposed in the first center bypass passage of the first hydraulic pump and connected to the parallel flow path for controlling the drive of the swing motor, an arm control valve for controlling the drive of the arm cylinder, and a left traveling motor A travel control valve for controlling the driving of the vehicle,
A boom control valve disposed in the second center bypass passage of the second hydraulic pump and connected to the parallel flow path to control the drive of the boom cylinder, a bucket control valve for controlling the drive of the bucket cylinder, and a right traveling motor A travel control valve for controlling the driving of the vehicle,
A pressure generator that outputs a control signal corresponding to the operation amount;
A bleed that is formed on the boom lowering control spool of the boom control valve and maintains the open state without closing the second center bypass passage even when the boom control valve is switched so as to lower the boom by operating the pressure generator. A flow path (bleed flow path);
A center bypass switching valve disposed on the most downstream side of the second center bypass passage and switched by a control signal pressure for switching the boom control valve,
When simultaneously operating the boom down operation and the operation of the working device having a relatively high operating pressure, the hydraulic oil from the second hydraulic pump is connected to the second center bypass passage via the parallel flow path and the serial flow path. Flows into bucket control valve.

本発明の好適な実施形態によれば、上述した作業装置はバケットであり、作業装置を制御する制御弁はバケット制御弁である。   According to a preferred embodiment of the present invention, the working device described above is a bucket, and the control valve that controls the working device is a bucket control valve.

上述したように構成される本発明の実施形態による建設機械用作業装置の駆動制御システムは、下記のメリットを有する。   The drive control system for the construction machine working device according to the embodiment of the present invention configured as described above has the following merits.

ブームダウン作動とバケット駆動のように作動圧力が異なる作業装置を同時に操作するとき、作動油が並列流路と直列流路を介してバケット制御弁に流れ込むようにして直列流路に沿って通過する流量に見合う分だけ流路を確保することができる）制御弁の内部に発生する圧力ロスを低減してエネルギーロスを減らすことができる。   When operating work devices with different operating pressures, such as boom down operation and bucket drive, at the same time, hydraulic oil flows along the series flow path so as to flow into the bucket control valve via the parallel flow path and the series flow path. The flow path can be secured by an amount corresponding to the flow rate), and the energy loss can be reduced by reducing the pressure loss generated inside the control valve.

従来の技術による建設機械用作業装置の駆動制御システムの油圧回路図である。FIG. 6 is a hydraulic circuit diagram of a drive control system for a construction machine working device according to a conventional technique. 従来の技術による建設機械用作業装置の駆動制御システムに適用される絞り装置である優先制御弁の要部抜粋拡大図である。It is the principal part extraction enlarged view of the priority control valve which is a throttle device applied to the drive control system of the working apparatus for construction machines by the prior art. 本発明の一実施形態による建設機械用作業装置の駆動制御システムの油圧回路図である。1 is a hydraulic circuit diagram of a drive control system for a construction machine working device according to an embodiment of the present invention. 図３に示す油圧回路図のブーム制御弁のブリード流路の拡大図である。It is an enlarged view of the bleed flow path of the boom control valve of the hydraulic circuit diagram shown in FIG.

以下、添付図面に基づき、本発明の好適な実施形態について詳述するが、これは本発明が属する技術分野において、通常の知識を有する者が発明を容易に実施できる程度に詳細に説明するためのものであり、これにより本発明の技術的な思想及び範疇が限定されることはない。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to explain in detail to the extent that a person having ordinary knowledge can easily carry out the invention in the technical field to which the present invention belongs. Therefore, the technical idea and category of the present invention are not limited thereby.

図３及び図４に示す本発明の一実施形態による建設機械用作業装置の駆動制御システムは、
エンジン１と、
エンジン１に接続される可変容量型第１及び第２油圧ポンプ（以下、「第１及び第２油圧ポンプ」と称する。）２、３並びにパイロットポンプ４と、
第１油圧ポンプ２の第１センターバイパス通路５に配設されて並列流路５ａにそれぞれ接続され、旋回モータ６の駆動を制御する旋回制御弁７と、アームシリンダ８の駆動を制御するアーム制御弁９と、左側走行モータ１０の駆動を制御する走行制御弁１１と、
第２油圧ポンプ３の第２センターバイパス通路１２に配設されて並列流路１２ａにそれぞれ接続され、ブームシリンダ１３の駆動を制御するブーム制御弁１４ａと、バケットシリンダ１５の駆動を制御するバケット制御弁１６と、右側走行モータ１７の駆動を制御する走行制御弁１８と、
操作量に対応する制御信号を出力する圧力発生装置１９、２０と、
ブーム制御弁１４ａのブーム下降側制御スプールに形成され、圧力発生装置１９の操作によりブームをダウンさせるようにブーム制御弁１４ａを切り換えるときにも第２センターバイパス通路１２を閉止することなく開放状態を維持するブリード流路２５と、
第２センターバイパス通路１２の最下流側に配設され、ブーム制御弁１４ａを切り換える制御信号圧によって切り換えられるセンターバイパス切換弁２６と、を備えて、
ブームダウン作動と相対的に作動圧力の高い作業装置（例えば、バケットをいう）の作動を同時に操作するとき、第２油圧ポンプ３からの作動油が第２センターバイパス通路１２に接続される並列流路１２ａ及び直列流路を介してバケット制御弁１６に流れ込む。 A drive control system for a construction machine working apparatus according to an embodiment of the present invention shown in FIGS.
Engine 1 and
Variable displacement first and second hydraulic pumps (hereinafter referred to as “first and second hydraulic pumps”) 2, 3 connected to the engine 1 and a pilot pump 4;
A swing control valve 7 disposed in the first center bypass passage 5 of the first hydraulic pump 2 and connected to the parallel flow path 5a and controlling the drive of the swing motor 6, and an arm control controlling the drive of the arm cylinder 8. A travel control valve 11 for controlling the drive of the valve 9 and the left travel motor 10;
A boom control valve 14 a that is disposed in the second center bypass passage 12 of the second hydraulic pump 3 and is connected to the parallel flow path 12 a and controls the drive of the boom cylinder 13, and a bucket control that controls the drive of the bucket cylinder 15. A travel control valve 18 for controlling the driving of the right travel motor 17;
Pressure generators 19 and 20 for outputting a control signal corresponding to the operation amount;
The boom control valve 14a is formed on the boom lowering control spool, and when the boom control valve 14a is switched so that the boom is lowered by the operation of the pressure generator 19, the second center bypass passage 12 is not closed and the open state is not closed. Maintaining a bleed channel 25;
A center bypass switching valve 26 disposed on the most downstream side of the second center bypass passage 12 and switched by a control signal pressure for switching the boom control valve 14a,
A parallel flow in which hydraulic oil from the second hydraulic pump 3 is connected to the second center bypass passage 12 when simultaneously operating a boom down operation and an operation of a working device having a relatively high operating pressure (for example, a bucket). It flows into the bucket control valve 16 via the path 12a and the series flow path.

このとき、上述したブーム制御弁１４ａのブーム下降側制御スプールに形成され、ブームをダウンさせるようにブーム制御弁１４ａを切り換えても、第２センターバイパス通路１２を閉止することなく開放状態を維持するブリード流路２５と、第２センターバイパス通路１２の最下流側に配設され、ブーム制御弁１４ａを切り換える制御信号圧によって切り換えられるセンターバイパス切換弁２６を除く構成は、図１に示す建設機械用作業装置の駆動制御システムの構成と同様であるため、これらの構成および作動についての詳細な説明は省略し、重複する構成要素には同じ図面符号を付する。   At this time, it is formed on the boom lowering control spool of the boom control valve 14a described above, and the open state is maintained without closing the second center bypass passage 12 even if the boom control valve 14a is switched so as to lower the boom. The configuration excluding the bleed passage 25 and the center bypass switching valve 26 that is disposed on the most downstream side of the second center bypass passage 12 and is switched by a control signal pressure that switches the boom control valve 14a is shown in FIG. Since it is the same as the structure of the drive control system of a working apparatus, the detailed description about these structures and operation | movement is abbreviate | omitted, and the same drawing code | symbol is attached | subjected to the overlapping component.

以下、添付図面に基づき、本発明の一実施形態による建設機械用作業装置の駆動制御システムの使用例について詳細に説明する。   Hereinafter, a usage example of a drive control system for a construction machine working device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

図３及び図４に示すように、ブームダウン作動とバケット駆動でのように作動圧力が異なる作業装置を同時に操作するとき、上述した圧力発生装置１９の操作によって、パイロットポンプ４からのパイロット信号圧が圧力発生装置１９を経て、ブーム制御弁１４ａを図中の右側方向に切り換える。このため、第２油圧ポンプ３から吐き出される作動油は、ロードチェック弁２２（図1参照）及びブーム制御弁１４ａを経てブームシリンダ１３の小チャンバに供給される。これと同時に、ブームシリンダ１３の大チャンバから流出する作動油は、ブーム制御弁１４ａ及び背圧チェック弁２３を経て油圧タンクＴに戻る。したがって、ブームシリンダ１３が収縮駆動されるのでブームを下降させることができる。   As shown in FIGS. 3 and 4, when simultaneously operating work devices having different operating pressures, such as boom down operation and bucket drive, the pilot signal pressure from the pilot pump 4 is controlled by the operation of the pressure generator 19 described above. Goes through the pressure generator 19 and switches the boom control valve 14a to the right in the figure. Therefore, the hydraulic oil discharged from the second hydraulic pump 3 is supplied to the small chamber of the boom cylinder 13 through the load check valve 22 (see FIG. 1) and the boom control valve 14a. At the same time, the hydraulic oil flowing out from the large chamber of the boom cylinder 13 returns to the hydraulic tank T via the boom control valve 14a and the back pressure check valve 23. Therefore, since the boom cylinder 13 is driven to contract, the boom can be lowered.

このとき、上述した背圧チェック弁２３によって発生した圧力に起因して、ブームシリンダ１３の大チャンバから流出する一部の流量は、ブーム下降側制御スプール（ブーム制御弁１４ａをいう）に形成された再生ラインを介してブームシリンダ１３の小チャンバに再生される。   At this time, due to the pressure generated by the back pressure check valve 23 described above, a part of the flow rate flowing out from the large chamber of the boom cylinder 13 is formed in the boom lowering control spool (referred to as the boom control valve 14a). It is regenerated in the small chamber of the boom cylinder 13 through the regenerative line.

一方、第２油圧ポンプ３から吐き出される作動油は、第２センターバイパス通路１２、ブーム制御弁１４ａのブーム下降側制御スプールに形成されたブリード流路２５を通過して、バケット制御弁１６の入口側に供給される。このため、バケット制御弁１６のロードチェック弁２７を介してバケット制御弁１６のスプール通路に接続される。一方、並列流路１２ａに配設される優先制御弁を経た流量が、ロードチェック弁２７を経た流量と合流されてバケット制御弁１６のスプールに流れ込む。   On the other hand, the hydraulic oil discharged from the second hydraulic pump 3 passes through the bleed passage 25 formed in the second center bypass passage 12 and the boom lowering control spool of the boom control valve 14a, and enters the bucket control valve 16. Supplied to the side. For this reason, the bucket control valve 16 is connected to the spool passage of the bucket control valve 16 via the load check valve 27. On the other hand, the flow rate that has passed through the priority control valve disposed in the parallel flow path 12 a is merged with the flow rate that has passed through the load check valve 27 and flows into the spool of the bucket control valve 16.

このため、作動圧力が異なるブームとバケットを同時に操作するときに、第２油圧ポンプ３からの流量が並列流路１２ａを介してバケット制御弁１６のスプールに流れ込む。これと同時に、第２油圧ポンプ３からの流量が第２センターバイパス通路１２を介してもバケット制御弁１６のスプールに流れ込む。これにより、第２センターバイパス通路１２を通過してバケット制御弁１６のスプールに流れ込む流量に見合う分だけ圧力ロスが低減される（このような圧力ロスの減少は走行制御弁１８にも同様に適用可能である）。   For this reason, when simultaneously operating the boom and the bucket having different operating pressures, the flow rate from the second hydraulic pump 3 flows into the spool of the bucket control valve 16 via the parallel flow path 12a. At the same time, the flow rate from the second hydraulic pump 3 flows into the spool of the bucket control valve 16 via the second center bypass passage 12. As a result, the pressure loss is reduced by an amount commensurate with the flow rate passing through the second center bypass passage 12 and flowing into the spool of the bucket control valve 16 (this reduction in pressure loss is also applied to the travel control valve 18 as well. Is possible).

以上述べたように、本発明の一実施形態による建設機械用作業装置の駆動制御システムによれば、ブームダウン作動とバケット駆動のように作動圧力が異なる作業装置を同時に操作するとき、並列流路と直列流路を介してバケット制御弁に作動油が流れ込むようにして制御弁の内部に発生する圧力ロスを低減させて、油圧システムの効率を増大させることができる。なお、操作量は、運転者による図示しないジョイスティックの操作によって制御信号を出力する。また、各種制御弁は図示しない制御器によって制御される。   As described above, according to the drive control system for a construction machine work device according to an embodiment of the present invention, when operating work devices having different operation pressures such as a boom down operation and a bucket drive, In addition, the hydraulic oil flows into the bucket control valve via the serial flow path to reduce the pressure loss generated inside the control valve, thereby increasing the efficiency of the hydraulic system. The operation amount is output as a control signal by a driver operating a joystick (not shown). Various control valves are controlled by a controller (not shown).

１ エンジン
２ 可変容量型第１油圧ポンプ（第１油圧ポンプ）
３ 可変容量型第２油圧ポンプ（第２油圧ポンプ）
４ パイロットポンプ
５ 第１センターバイパス通路
５ａ 並列流路
６ 旋回モータ
７ 旋回制御弁
８ アームシリンダ
９ アーム制御弁
１０ 左側走行モータ
１１、１８ 走行制御弁
１３ ブームシリンダ
１２ 第２センターバイパス通路
１２ａ 並列流路
１３ ブームシリンダ
１４ （従来の）ブーム制御弁
１４ａ （本発明の）ブーム制御弁
１５ バケットシリンダ
１６ バケット制御弁
１７ 右側走行モータ
１９、２０ 圧力発生装置
２１ 戻り流路
２２ ロードチェック弁
２３ 背圧チェック弁
２４ 絞り装置
２５ ブリード流路
２６ センターバイパス切換弁
Ｔ 油圧タンク 1 Engine 2 Variable displacement type 1st hydraulic pump (1st hydraulic pump)
3 Variable displacement second hydraulic pump (second hydraulic pump)
4 Pilot pump
DESCRIPTION OF SYMBOLS 5 1st center bypass passage 5a Parallel flow path 6 Swing motor 7 Swing control valve 8 Arm cylinder 9 Arm control valve 10 Left side travel motor 11, 18 Travel control valve 13 Boom cylinder 12 2nd center bypass path 12a Parallel flow path 13 Boom cylinder 14 (Conventional) Boom Control Valve 14a (Invention) Boom Control Valve 15 Bucket Cylinder 16 Bucket Control Valve 17 Right Traveling Motor 19, 20 Pressure Generator 21 Return Flow Path 22 Load Check Valve 23 Back Pressure Check Valve 24 Throttle Device 25 Bleed flow path 26 Center bypass switching valve T Hydraulic tank

Claims (2)

エンジンと、
前記エンジンに接続される可変容量型第１及び第２油圧ポンプ並びにパイロットポンプと、
前記第１油圧ポンプの第１センターバイパス通路に配設されて並列流路にそれぞれ接続され、旋回モータの駆動を制御する旋回制御弁と、アームシリンダの駆動を制御するアーム制御弁と、左側走行モータの駆動を制御する走行制御弁と、
前記第２油圧ポンプの第２センターバイパス通路に配設されて並列流路にそれぞれ接続され、ブームシリンダの駆動を制御するブーム制御弁と、バケットシリンダの駆動を制御するバケット制御弁と、右側走行モータの駆動を制御する走行制御弁と、
操作量に対応する制御信号を出力する圧力発生装置と、
前記ブーム制御弁のブーム下降側制御スプールに形成され、前記圧力発生装置の操作によりブームをダウンさせるように前記ブーム制御弁を切り換えるとき、前記第２センターバイパス通路を閉止することなく開放状態を維持するブリード流路と、
前記第２センターバイパス通路の最下流側に配設され、前記ブーム制御弁を切り換える制御信号圧によって切り換えられるセンターバイパス切換弁と、を備えて、
ブームダウン作動と相対的に作動圧力の高い作業装置の作動とを同時に操作するとき、前記第２油圧ポンプからの作動油が前記第２センターバイパス通路に接続される前記並列流路及び直列流路を介して前記バケット制御弁に流れ込むことを特徴とする建設機械用作業装置の駆動制御システム。 Engine,
A variable displacement first and second hydraulic pump and a pilot pump connected to the engine;
A swing control valve disposed in the first center bypass passage of the first hydraulic pump and connected to each of the parallel flow paths to control the drive of the swing motor, an arm control valve to control the drive of the arm cylinder, and left side travel A travel control valve that controls the drive of the motor;
A boom control valve disposed in the second center bypass passage of the second hydraulic pump and connected to each of the parallel flow paths to control the drive of the boom cylinder; a bucket control valve to control the drive of the bucket cylinder; A travel control valve that controls the drive of the motor;
A pressure generator that outputs a control signal corresponding to the operation amount;
The boom control valve is formed on a boom lowering control spool and maintains the open state without closing the second center bypass passage when the boom control valve is switched so as to lower the boom by operating the pressure generating device. A bleed flow path,
A center bypass switching valve disposed on the most downstream side of the second center bypass passage and switched by a control signal pressure for switching the boom control valve;
When the boom down operation and the operation of the working device having a relatively high operating pressure are simultaneously operated, the hydraulic fluid from the second hydraulic pump is connected to the second center bypass passage. A drive control system for a construction machine working device, characterized by flowing into the bucket control valve via 前記作業装置はバケットであり、前記作業装置を制御する制御弁は前記バケット制御弁であることを特徴とする請求項１に記載の建設機械用作業装置の駆動制御システム。   2. The drive control system for a construction machine working device according to claim 1, wherein the working device is a bucket, and the control valve for controlling the working device is the bucket control valve.
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EP2772653A4 (en) 2015-10-21
JP2014534386A (en) 2014-12-18
KR20140074306A (en) 2014-06-17
WO2013051740A1 (en) 2013-04-11
EP2772653A1 (en) 2014-09-03
US20140238010A1 (en) 2014-08-28
CN103842663A (en) 2014-06-04

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