WO2004076334A1 - Hydraulic control device of hydraulic working machine - Google Patents

Hydraulic control device of hydraulic working machine Download PDF

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Publication number
WO2004076334A1
WO2004076334A1 PCT/JP2004/002380 JP2004002380W WO2004076334A1 WO 2004076334 A1 WO2004076334 A1 WO 2004076334A1 JP 2004002380 W JP2004002380 W JP 2004002380W WO 2004076334 A1 WO2004076334 A1 WO 2004076334A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
hydraulic
working machine
control device
boom
Prior art date
Application number
PCT/JP2004/002380
Other languages
French (fr)
Japanese (ja)
Inventor
Kensuke Sato
Tsukasa Toyooka
Original Assignee
Hitachi Construction Machinery Co., 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 Hitachi Construction Machinery Co., Ltd. filed Critical Hitachi Construction Machinery Co., Ltd.
Priority to JP2005502952A priority Critical patent/JPWO2004076334A1/en
Priority to EP04715501A priority patent/EP1600419A4/en
Publication of WO2004076334A1 publication Critical patent/WO2004076334A1/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F3/00Dredgers; Soil-shifting machines
    • E02F3/04Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28Dredgers; 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
    • E02F3/36Component parts
    • E02F3/42Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/065Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
    • B66F9/0655Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075Constructional features or details
    • B66F9/20Means for actuating or controlling masts, platforms, or forks
    • B66F9/22Hydraulic devices or systems

Definitions

  • the present invention provides an object capable of maintaining a vertical angle with respect to a vehicle body at a predetermined angle irrespective of the boom and the up-and-down angle of the boom.
  • a hydraulic control device for a hydraulic working machine such as a lift truck having a
  • Patent Document 1 As a hydraulic work machine, a vehicle for cargo handling work called a U-fat ultra-sock and a work vehicle for a work place are known.
  • a device as disclosed in Patent Document 1 can be publicly known.
  • the force that can be output by the hydraulic cylinder is expressed by the pressure receiving area X pressure.
  • the leveling correction operation is selected by the selection switch, and the leveling correction is performed separately.
  • the present invention has been made in view of the circumstances of the prior art as described above.
  • the purpose of the present invention is to reduce the operating speed of the boom raising compared to the conventional art.
  • the first means is that the m is a boom that is rotatably mounted on the fixed side as the rotation m And a S'J 15-boom that is rotatably attached to the first cylinder that rotates in the up-and-down direction, and that is rotatably attached to the front end of the boom.
  • Pressurized oil is supplied to the third cylinder and the first cylinder and the second cylinder, respectively, which maintain the vertical angle of the sociment at a preset angle.
  • a hydraulic pump, a directional control valve for controlling the flow of hydraulic oil supplied from the hydraulic pump to the first and second cylinders, and a switching operation of the directional control valve When the operating pressure of the first cylinder during the raising operation is higher than the predetermined pressure, U ⁇ characterized by comprising means for communicating the side on which the extension operation of the first cylinder is performed with the side on which the extension operation of the third cylinder is performed.
  • the second means is the first pipe and the m IE third cylinder in which the means for communicating in the first means is connected to the side on which the first cylinder performs the extension operation. No. connected to the side that performs the extension operation
  • the means for communicating in the second means performs a boom raising operation with the first switching valve provided in the third conduit.
  • the pressure of the first pipeline is introduced to the PV port of the first switching valve.
  • the second switching valve is characterized by 0.
  • the fourth means is that, in the third hand, the operating device is a hydraulic pipe P-slot type operating device, and the second switching valve is connected to the pilot port with a WJ self-hydraulic hydraulic port device. It is characterized in that the pressure is derived and the first switching valve is switched.
  • the fifth means is characterized in that, in the first means, the boom has a two-stage or more stretching mechanism.o
  • the sixth means is that the iu key is held at the first hand f
  • the seventh means is characterized in that it includes one of a bucket, a bucket and a bucket.
  • the seventh means is that the fixed side is the main body of the hydraulic working machine in the first means. 0
  • the eighth hand K3 ⁇ 4 is characterized in that the hydraulic working machine picks up any one of a lift truck «3D and a work vehicle in the fifth fl 1 or the seventh hand FX. .
  • the first cylinder is an undulating cylinder.
  • the second cylinder is a tilt cylinder 8
  • the third cylinder is a first and a second switching valve 21.
  • the hydraulic pump is at 10
  • the directional control valve is at 11
  • the operating device is at 13
  • the first switching valve is at the first switching valve 21
  • the second switching valve is at 2
  • the first pipe to the switching valve 20 is connected to the pipe 35
  • the second pipe is connected to the pipe 33
  • the third pipe is connected to the pipe 37.
  • the pressure oil discharged from the hydraulic pump when the operating pressure of the first cylinder is higher than the pressure applied in advance during the boom raising operation is lower than the pressure applied in advance. Since it is supplied to both the extension operation side of the first cylinder and the extension operation side of the third cylinder, the extension tension of the third cylinder is also reduced.
  • FIG. 1 is a circuit diagram of a hydraulic circuit provided in a hydraulic working machine according to an embodiment of the present invention.
  • FIG. 2 is a side view showing an example of the hydraulic working machine according to the embodiment of the present invention.
  • Fig. 2 shows an example of a U-fault truck as a hydraulic working machine according to the embodiment of the present invention.
  • the rack consists of a vehicle 1 having a wheel 2, a rear car booklet 3 and a driver's seat 4, and a telescoping vehicle 5 and a vehicle 5, which are rotatably mounted at their ends.
  • a fork such as a fork rotatably mounted at the tip of the vehicle, and a vehicle body 1 and a vehicle 5 are disposed between the vehicle body 1 and the vehicle 5 and are connected to the vehicle body 1.
  • the ax is placed between the up-and-down cylinder 7 for rotating the room 5 in the up-and-down direction (A-B direction) and the pool 5 and the switch 6, and the ax is placed on the boom 5.
  • the tilt cylinder 8 for rotating the touch panel 6 in the tilt direction (c-D direction) and the body 1 and the boom 5 are irfed between the body 1 and the boom 5.
  • the leveling cylinder 9 also preliminarily sets the relative monthly degree (tilt angle) of the vertical direction of the attachment 6 with respect to the vehicle body 1 to the mouth whose elevation angle of the program 5 with respect to the vehicle body 1 has been changed. This is for maintaining the set angle, and is connected to the tilt cylinder 8 via a pipe (not shown). If the boom 5 is raised and lowered, the leveling cylinder is used. The pressurized oil extruded from 9 is supplied to a tilt cylinder 8 to change the tilt angle of the atatomic tip 6 with respect to the plume 5.
  • the attachment 6 is a load «: luck A
  • buckets for excavating and leveling earth and sand, or baskets for lifting loads and people are used.
  • FIG. 1 shows a circuit diagram of a hydraulic circuit provided in the float truck having the above configuration.
  • the circuit diagram 1 ⁇ -in FIG. 1 has no relation to the description of the present invention because the circuit diagram 1 ⁇ -
  • the hydraulic circuit for expanding and contracting the air is omitted, the arm 5 can be expanded and contracted in multiple stages, for example, five stages. As can be seen from FIG.
  • the hydraulic circuit according to the present embodiment is configured such that the flow of the hydraulic oil supplied to the undulating cylinder 7 from the hydraulic pump 10 * — ⁇ Control valve 11 for controlling the flow of hydraulic oil supplied to tilt cylinder 8 from hydraulic pump 10 and operating device 13 for directional control valve 11 and directional control valve 11
  • the U-leaf valve 17 provided in the line connecting the outlet line 30 of the tank 0 and the tank 18 is provided. 13a 14a, a pressure reducing valve 13b 14b, and a pi-pump pump 40 for supplying a negative PV pressure.
  • the extension of the undulating cylinder 7 is achieved.
  • a pipe 37 connecting the operating pipe 35 to the extension pipe 3 3 of the repelling cylinder U 9 is provided.
  • the pipe 37 has a first switching valve 21 and an operation valve. It is switched by the boom-up operation of the device 13 and the port of the first switching valve 21
  • -2nd d is provided with a second switching valve 20 for supplying the pressure of the elongating cylinder 7 on the extension operation side of the undulating cylinder 7, and is provided for the first switching valve 21. If the constant pressure of the first switching valve 21 is changed to pX At by the return spring 21c obtained, if ⁇ is the switching SX constant pressure is slightly lower than the 5ML pressure of the UU valve 17 O 5
  • the means for communicating in the area B of the patent a is constituted by a combination of the first directional control valve 21 and the second directional control valve 20 described in J.
  • Operate the receiver Operate the lever 14a.
  • the directional valve 12 When the directional valve 12 is switched from the neutral position 12b to the position 12a by supplying the pit pressure to the V top port 12d, the / primary pressure pump 10
  • the pressure oil discharged from the cylinder is supplied to the P-so chamber 8b of the tilt cylinder 8 through the pipe 30 and the directional switching valve 12 and the pipe 32, so that the tilt cylinder 8 contracts.
  • the tilting lever 6 moves in the direction of rotation and rotates in the downward direction (D direction) .o
  • the tilting cylinder 8 is pushed from the pot chamber 8a of the tilting cylinder 8 as the cylinder 8 contracts.
  • the discharged hydraulic oil is supplied to the tank 18 through the power valve 16, the balance valve 16, the path 31, and the directional valve 12.
  • control lever is operated by the control lever 14 14 m and the power is supplied to the power port 12 e.
  • the pressure oil discharged from the hydraulic pump 10 is connected to the line 30, the directional control valve 12, the line 31, and the power supply-noise valve
  • the operator operates the operating lever 13a to supply the pilot pressure to the pilot port 11d, and moves the directional control valve 11 from the neutral position 1 1b to the position 1
  • the hydraulic oil discharged from the hydraulic pump 10 was released to the line 30, the directional valve 11, and the line 35.
  • the undulating cylinder 7 is supplied to the bottom chamber 7a of the undulating cylinder 7 through the valve 15a, so that the undulating cylinder 7 operates in the extension direction and 1 turns in the up direction (A direction). Hydraulic oil pushed out from the load chamber 7 of the up-and-down cylinder 7 with the extension movement of the up-and-down cylinder 7 flows through the pipe 36 and the directional valve 11. Returned to link 18 B
  • the operator operates the operation lever 13a to supply the pie port sort pressure to the pie port sort port 11e, and sets the directional control valve 11 to the room 1.
  • the undulating cylinder 7 is supplied to the P pod 7b, so that the undulating cylinder 7 operates in the contracting direction, and the bump 5 rotates in the lowering direction (the B direction).
  • Hydraulic oil pushed out from the port chamber 7a of the up-and-down cylinder 7 is a counterbalance valve 15, a pipeline 35 and a directional control valve 1.
  • the y-direction switching valve 11 is switched to the position 11a by the pilot pressure from the operating device 13.
  • the second switching valve 20 is switched to the position 20b, so that the pressure oil discharged from the hydraulic pump 10 is supplied to the pipeline 30 and the directional switching valve.
  • the operating pressure of the undulating cylinder 7 also acts on the outlet port 21d of the first switching valve 21 via the line 37.
  • the operating pressure of the undulating cylinder 7 increases as the weight of the luggage to be lifted by the anchor 6 increases.
  • the first switching valve 21 When the operating pressure of the undulating cylinder 7 is lower than the set pressure of the first switching valve 21 by U, the first switching valve 21 is held at the position 21a. The state of interruption to 37 and the state of communication between pipeline 31 and pipeline 33 are maintained. Therefore, also in this case, the operation for raising the boom 5 and the operation for adjusting the tilt angle of the attachment 6 accompanying the raising operation of the boom 5 are performed in the above-described procedure.
  • the operating pressure of the up / down cylinder 7 is lower than the set pressure of the first switching valve 21.In some cases, the first switching valve 21 is switched to the position 21b.
  • the pipe 3 3 and the pipe 3 5 are connected via the pipe 3 7 and the pipe 3 1 Is connected to evening 18. For this reason, the hydraulic oil discharged from the hydraulic pump 10 or b moves up and down the pipe 30 through the directional control valve 11 and the pipe 35.
  • the part is supplied to the bottom chamber 9a of the leveling cylinder 9 through the pipe 37 switching valve 21 and the pipe 33.
  • a force in the extension direction is generated on both the up-and-down cylinder 7 and the leveling cylinder 9, and these act as a force for rotating the boom 5 in the up direction.
  • the foot capacity of the hydraulic working machine is increased as compared to the case where the program 5 is rotated alone in the raising direction.
  • the working device 13 14 is exemplified by a hydraulic pad type.
  • an electrically operated type can be used.
  • the operating lever 13 a M is output by the operation, and the second directional control valve 20 is switched by the i output by the operation of the operation A-13a.
  • a pressure detector is provided in the port circuit that is connected to the port port 1 1d on the side that switches the direction control valve 11 to the up position. Pressure conversion is detected by the pressure detector, and
  • the switching means for connecting the pipe 37 with the first and second switching valves 21 and 20 is constituted.
  • the pipe 37 and the directional control valve 1 are provided. C on the side that switches 1 to the boom-up side. ⁇ Cut port
  • Pressure sensors are arranged in each of the pipe circuits connected to 11d, and the pressure in line 37 is greater than the preset pressure, and the directional control valve 11 is on the boom-up side.
  • the control device detects that switching has been performed by a signal from each pressure detector, the first switching valve 21 is switched according to the control signal from the control device.
  • the control signal from the control device is converted into pressure by an electro-hydraulic conversion valve, and the first switching valve 21 is switched. This is performed by applying pressure to the pipe port 21d.
  • the hydraulic working machine according to the present embodiment includes a pipe connecting the extension operation side pipe 35 of the undulating cylinder 7 and the extension operation side pipe 33 of the leveling cylinder 9.
  • the respective extension operation side pipes 33 and 35 are connected, and the pressure oil discharged from the hydraulic pump 10 is raised and lowered. Since it is supplied to both the extension operation side of the cylinder 7 and the extension operation side of the leveling cylinder 9, the extension tension of the leveling cylinder 9 is also used as a driving force for rotating the beam.
  • the lifting capacity of the hydraulic working machine can be increased by
  • a means for supplying the hydraulic oil discharged from the hydraulic pump 10 to the leveling cylinder 9 is provided by two switching valves 2.
  • the communicating means is constituted by the first switching valve 21 and the second switching valve 20.
  • the first cylinder during the raising operation of the pump is operated.
  • the operating pressure is the pressure set in advance.
  • a function is provided to connect the side that performs the extension operation of the first cylinder and the side that performs the extension operation of the third cylinder. If this is the case, the present invention is not limited to the combination of the above-mentioned switching valves 2 1 and 2 0, but can be appropriately measured as needed.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Jib Cranes (AREA)

Abstract

A hydraulic control device of a hydraulic working machine, comprising a derricking cylinder (7) rotating the free end of a boom in a derricking direction, an attachment rotatably fixed to the tip part of the boom, a tilt cylinder (8) vertically rotating the attachment relative to the boom, and a leveling cylinder (9) extending/retracting in conjunction with the derricking operation of the boom to hold the vertical angle of the attachment at a preset angle according to a variation in the derricking angle of the boom, wherein when the working pressure of the derricking cylinder (7) is increased to a pressure higher than a preset pressure in boom raising operation, a pipeline (35) for performing the extending operation of the derricking cylinder (7) is allowed to communicate with a pipeline (33) for performing the extending operation of the leveling cylinder (9). This communication is performed by a pipeline (37) installed between the pipelines (35) and (33) and first and second selector valves (21) and (20) switching the circuit of the pipeline (37).

Description

明 細 書 油圧作業機の油圧制御装置 技術分里  Description Hydraulic control equipment for hydraulic working machines
本発明は、 ブ一厶 と 、 当該ブ ―厶の起伏角度の如何に関わ り な く 車体に対する上下方向の角度を予め 定 した角度に維持可能なァタ The present invention provides an object capable of maintaining a vertical angle with respect to a vehicle body at a predetermined angle irrespective of the boom and the up-and-down angle of the boom.
、ンチメ ン 卜 と を備えた リ フ 卜 卜 ラ ソ クなどの油圧作業機の油圧制御 装置に関する And a hydraulic control device for a hydraulic working machine such as a lift truck having a
景技術  Landscape technology
従来よ り 、 油圧作業機と して 、 U フ 卜 卜 ラ ソ ク と呼ぱれる荷役作 業用の車両や问所作業車が知 られている 问所作業車と しては、 例 ば登録実用新案第 2 5 6 6 6 3 1 公報特許文献 1 に開示さ れて いるよ う な装置が公知でめる  Conventionally, as a hydraulic work machine, a vehicle for cargo handling work called a U-fat ultra-sock and a work vehicle for a work place are known. A device as disclosed in Patent Document 1 can be publicly known.
の種の高所作業車や U フ 卜 卜 ラ ッ クなどの油圧作業機にお いて は 、 U フ ト能力 、 即ち 、 どれだけの重 物を持ち上げられるかの性 能が重視される 油圧作業機の U フ 卜能力を问めるため には 、 ― ft又 に て 積  For hydraulic working machines such as this type of aerial work vehicles and U-fat trucks, hydraulic work in which the U-foot capacity, that is, the ability to lift heavy objects is important To increase the U-float capability of the aircraft,
、 起伏シ リ ンダと し 受圧面 がよ 大さな油圧シ リ ンダを用 い と う 手段がと られる  , Means to use a hydraulic cylinder with a large pressure-receiving surface as an up-and-down cylinder
しか しながら 、 油圧シ U ンダが出せる力 は受圧面積 X圧力で表さ れるので、 受圧面禾貝が大さな油圧シ U ンダを用 いれば油圧作業機の However, the force that can be output by the hydraulic cylinder is expressed by the pressure receiving area X pressure.
U フ 卜能力 を向上させる とがでさるが 、 油圧シ リ ンダの伸びス ピAlthough it is possible to improve the U-flot capability, the speed of the hydraulic cylinder
― は 、 圧油の流入流里 /受圧面積で表されるので、 受圧面積が大 さな油圧シ リ ンダを用 いる と 、 ブ ―厶上げのス ピ一 ドが遅く なる と い う 不都合が生 じる また 、 油圧シ リ ンダは 、 受圧面積が大き く な る ほど高価になるので、 受圧面積が大きな油圧シ リ ンダを用 いる と 、 油圧作業機がコ ス 卜高になる不都合も生 じる。 -Is expressed by the pressure oil inflow area / pressure receiving area.Therefore, if a hydraulic cylinder with a large pressure receiving area is used, the speed of raising the boom will be delayed. In addition, the hydraulic cylinder becomes more expensive as the pressure receiving area becomes larger. Therefore, if a hydraulic cylinder with a large pressure receiving area is used, the cost of the hydraulic working machine becomes higher. I will.
また、 前記従来技術では、 レべ リ ング修正動作を選択スィ ッ チで 選択するよ う に し、 レべ リ ング修正を別途行 う よ う に しているが、 ブーム上げの動作時の速度ゃ リ フ 卜能力 につ いては特に者慮さ れて いない o Further, in the above-mentioned prior art, the leveling correction operation is selected by the selection switch, and the leveling correction is performed separately.ゃ With regard to the lifting ability, Not o
本発明は のよ うな従来技術の 情に みてなされたもので その 的は 、 ブ ―厶上げの動作速度を従来よ リ 遅 く する こ とな < u フ 卜能力の高い油圧作業機の油圧制御装置を提供する と にあ る 発明の開示  SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances of the prior art as described above. The purpose of the present invention is to reduce the operating speed of the boom raising compared to the conventional art. DISCLOSURE OF THE INVENTION IN PROVIDING THE DEVICE
m記目 的を達成するため、 第 1 の手段は mが回動 mと して固 定側に回動可能に取 り 付け られたブ ―厶 と 記プ 厶の他 m側を 白 由 と して起伏方向 に回動させる第 1 のシ U ンダと 前記ブ ―厶 の 白 由端側の先 部に回動可能に取 V 付け られたァ夕 ソチメ ン 卜 と S'J 15ブ 厶 に対 して前記ァタ クチメ ン 卜 を上下方向 に回動させ る第 2 のシ リ ンダと 、 刖記ブームの起伏動作に連動 して伸縮 し 記プ 厶の起伏角度の変ィし ι<~ ι>ί して 記ァ夕 ソチメ ン 卜の上下方向 の角度を予め設定 した角度に保持する第 3 の シ U ンダと m言己第 1 及び第 2 のシ リ ンダにそれぞれ圧油を供給する油圧ポ ンプと 、 当該 油圧ポ ンプか ら 記第 1 及び第 2 の シ ンダにそれぞれ供給される 圧油の流れを制御する方向制御弁と 当該方向制御弁を切換操作す る操作装置と を え / 由圧作業機の油圧制御 鼠 に て 、 プ ―厶 上げ J 作時における 第 1 のシ ンダの作動圧が予め 定 した圧 力よ U も高く なつ た と き に 則 §己第 1 のシ リ ンダの伸び動作を行わ せる側と 前記第 3 のシ リ ンダの伸び動作を行わせる側とを連通させ る手段を備えている こ と を特徴とする  In order to achieve the purpose of the m mark, the first means is that the m is a boom that is rotatably mounted on the fixed side as the rotation m And a S'J 15-boom that is rotatably attached to the first cylinder that rotates in the up-and-down direction, and that is rotatably attached to the front end of the boom. On the other hand, a second cylinder for rotating the above-mentioned actuator in the up-down direction, and 伸縮 the expansion and contraction of the boom in response to the up-and-down movement of the boom, and the change in the up-and-down angle of the program. Pressurized oil is supplied to the third cylinder and the first cylinder and the second cylinder, respectively, which maintain the vertical angle of the sociment at a preset angle. A hydraulic pump, a directional control valve for controlling the flow of hydraulic oil supplied from the hydraulic pump to the first and second cylinders, and a switching operation of the directional control valve When the operating pressure of the first cylinder during the raising operation is higher than the predetermined pressure, U § characterized by comprising means for communicating the side on which the extension operation of the first cylinder is performed with the side on which the extension operation of the third cylinder is performed.
第 2 の手段は 第 1 の手段において 記連通させる手段が 前 記第 1 の シ リ ンダの伸び動作を行わせる側 に接 weされた第 1 の管路 ねよび m IE第 3 の シ リ ンダの伸び動作を行わせる側 に接 された第 The second means is the first pipe and the m IE third cylinder in which the means for communicating in the first means is connected to the side on which the first cylinder performs the extension operation. No. connected to the side that performs the extension operation
2 の管路を接続する第 3 の管路に設け られている と を特徴とす る It is provided in the third pipeline connecting the two pipelines.
第 3 の手段は 第 2 の手段において 記連通させる手段が 記第 3 の管路に設け られた第 1 の切換弁 と ブ 厶上げ操作を行う 則記操作装置の操作に応 じて切 リ 換? bれ 刖記第 1 の管路の圧力 を 記第 1 の切換弁のパィ P V 卜ポ ―卜 に導 < 第 2 の切換弁 とか ら なる こ とを特徴とする 0 In the third means, the means for communicating in the second means performs a boom raising operation with the first switching valve provided in the third conduit. Switch according to the operation of the operating device? b. The pressure of the first pipeline is introduced to the PV port of the first switching valve. The second switching valve is characterized by 0.
第 4 の手段は、 第 3 の手 において 記操作装置が油圧パィ P ソ 卜式の操作装置であ 記第 2 の切換弁は 記パイ ロ ッ 卜 ポ ― 卜 に WJ言己油圧パイ 口 ソ 卜圧を導き 記第 1 の切換弁の切換を行ラ と を特徴とする。  The fourth means is that, in the third hand, the operating device is a hydraulic pipe P-slot type operating device, and the second switching valve is connected to the pilot port with a WJ self-hydraulic hydraulic port device. It is characterized in that the pressure is derived and the first switching valve is switched.
第 5 の手段は、 第 1 の手段において 記ブ 厶が 2 段以上の伸 縮機構を備えている と を特徴とする o  The fifth means is characterized in that, in the first means, the boom has a two-stage or more stretching mechanism.o
第 6 の手段は、 第 1 の手 f又において iu記ァ夕 、ンチメ ン 卜が ホ The sixth means is that the iu key is held at the first hand f
―ク 、 バスケ ッ 卜 およびバケ ッ 卜の 1 つを含む とを特徴とする 0 第 7 の手段は、 第 1 の手段において 記固定側が前記油圧作業 機の本体部である こ とを特徴とする 0 -The seventh means is characterized in that it includes one of a bucket, a bucket and a bucket.- The seventh means is that the fixed side is the main body of the hydraulic working machine in the first means. 0
第 8 の手 K¾は、 5fl 1 ない し第 7 の ずれかの手 FXにおいて 前記 油圧作業機が リ フ ト 卜ラ ッ ク «3Dよび问所作業車の いずれかを a む とを特徴と する。  The eighth hand K¾ is characterized in that the hydraulic working machine picks up any one of a lift truck «3D and a work vehicle in the fifth fl 1 or the seventh hand FX. .
なね 、 以下の実施形態において 第 1 のシ U ンダは起伏シ U ンダ Note that, in the following embodiments, the first cylinder is an undulating cylinder.
7 に 、 第 2 の シ リ ンダはチル 卜 シ ンダ 8 に 第 3 のシ リ ンダは レ ベ U ングシ リ ンダ 9 に 連通する手 は第 1 及び第 2 切換弁 2 1 7, the second cylinder is a tilt cylinder 8, and the third cylinder is a first and a second switching valve 21.
1=1 1=1  1 = 1 1 = 1
2 0 に、 油圧ポ ンプは符 1 0 に 方向制御弁は符 1 1 に 操作 装置は符 1 3 に、 第 1 の切換弁は第 1 切換弁 2 1 に 、 第 2 の切換 弁は第 2 切換弁 2 0 に 第 1 の管路は管路 3 5 に 第 2 の管路は管 路 3 3 に 第 3 の管路は管路 3 7 に 第 1 の切換弁のパイ 口 ッ 卜ポ At 20, the hydraulic pump is at 10, the directional control valve is at 11, the operating device is at 13, the first switching valve is at the first switching valve 21, and the second switching valve is at 2 The first pipe to the switching valve 20 is connected to the pipe 35, the second pipe is connected to the pipe 33, and the third pipe is connected to the pipe 37.
―卜 は符 2 1 d にそれぞれ対応する 0 -0 corresponds to the mark 2 1 d respectively
本発明 によれば、 ブ ―厶上げ操作時において第 1 のシ リ ンダの作 動圧が予め B 疋 した圧力よ も高 < な た と さ に油圧ポ ンプか ら吐 出された圧油が第 1 のシ リ ンダの伸び動作側及び第 3 のシ リ ンダの 伸び動作側の双方に供給されるので 第 3 の シ U ンダの伸張力 も ブ According to the present invention, the pressure oil discharged from the hydraulic pump when the operating pressure of the first cylinder is higher than the pressure applied in advance during the boom raising operation is lower than the pressure applied in advance. Since it is supplied to both the extension operation side of the first cylinder and the extension operation side of the third cylinder, the extension tension of the third cylinder is also reduced.
―厶を回動さ せる駆動力 と して利用でさ 油圧作業機の リ フ 卜能力 を问める こ とができ る 0 図面の簡単な説明 It can be used as a driving force to rotate the arm. It can increase the lifting ability of the hydraulic working machine. 0 BRIEF DESCRIPTION OF THE FIGURES
図 1 は本発明の実施形態に係る油圧作業機に備え られる油圧回路 の回路図である  FIG. 1 is a circuit diagram of a hydraulic circuit provided in a hydraulic working machine according to an embodiment of the present invention.
図 2 は本発明の実施形態に係る油圧作業機の一例を示す側面図で め る 。 発明を実施するための最良の形態  FIG. 2 is a side view showing an example of the hydraulic working machine according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
以下 本発明を実施するための最良の形態につ いて 、 図面を参照 して説明する  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
図 2 は本発明の実施形態に係 油圧作業機と しての U フ 卜 卜 ラ ッ ク の一例を示す図 a? o の図よ り 明 らかなよ う に 本実施形態 に係る フ 卜 卜 ラ ッ ク は、 刖輪 2 、 後車冊 3 及び運転席 4 を有する車 体 1 と 車体 1 に —端が回動可能に取 り 付け られた伸縮可能なブ一 ム 5 と ブ一厶 5 の先端部に回動可能に取 付け られたフ ォ ーク な どのァ夕 ソ チメ ン 卜 6 と、 車体 1 と プ一厶 5 との間 に 置され、 車 体 1 に対 してブ一厶 5 を起伏方向 ( A - B 方向 ) に回動さ せる起伏 シ リ ンダ 7 と 、 プー厶 5 と ァ夕 ッチメ ン 卜 6 との間 に ax置され、 ブ ー厶 5 に対 してァ タ ツチメ ン 卜 6 をチル 卜方向 ( c ― D方向) に回 動さ せるチル 卜 シ リ ンダ 8 と 、 車体 1 と ブ - 厶 5 と の間 1に irf ¾ れ, ブーム 5 の起伏動作に連動 して伸縮される レベ リ ングシ リ ンダ 9 と を備えている。  Fig. 2 shows an example of a U-fault truck as a hydraulic working machine according to the embodiment of the present invention. The rack consists of a vehicle 1 having a wheel 2, a rear car booklet 3 and a driver's seat 4, and a telescoping vehicle 5 and a vehicle 5, which are rotatably mounted at their ends. For example, a fork such as a fork rotatably mounted at the tip of the vehicle, and a vehicle body 1 and a vehicle 5 are disposed between the vehicle body 1 and the vehicle 5 and are connected to the vehicle body 1. The ax is placed between the up-and-down cylinder 7 for rotating the room 5 in the up-and-down direction (A-B direction) and the pool 5 and the switch 6, and the ax is placed on the boom 5. The tilt cylinder 8 for rotating the touch panel 6 in the tilt direction (c-D direction) and the body 1 and the boom 5 are irfed between the body 1 and the boom 5. Interlock and expand and contract And a leveling cylinder 9.
レベ ングシ U ンダ 9 は 、 車体 1 に対する プ一厶 5 の起伏角度が 変更された 口 に も、 車体 1 に対する ァタ ッ チメ ン 卜 6 の上下方向 の相対的な月度 (チル 卜角度 ) を予め設定 した角度に保つための も のであ つ て 、 チル 卜 シ リ ンダ 8 と 図示 しない管路を介 して接続され てお り ブ一厶 5 が起伏操作された と さ 、 レベ リ ングシ リ ンダ 9 か ら押 し出された圧油をチル 卜 シ リ ンダ 8 に供給 して プー厶 5 に対 する ァタ ソ チメ ン 卜 6 のチル 卜角度を変更するよう になつ ている。 お、 の実施形態では、 ァタ ッチメ ン 卜 6 と して荷 «:運 A、 フ ォ ー ク を例示 しているが、 その他に、 土砂の掘削や整地を行 う バケ ッ ト 、 ある いは荷や人を上方に バスケ ッ 卜などが使用 される The leveling cylinder 9 also preliminarily sets the relative monthly degree (tilt angle) of the vertical direction of the attachment 6 with respect to the vehicle body 1 to the mouth whose elevation angle of the program 5 with respect to the vehicle body 1 has been changed. This is for maintaining the set angle, and is connected to the tilt cylinder 8 via a pipe (not shown). If the boom 5 is raised and lowered, the leveling cylinder is used. The pressurized oil extruded from 9 is supplied to a tilt cylinder 8 to change the tilt angle of the atatomic tip 6 with respect to the plume 5. In this embodiment, the attachment 6 is a load «: luck A, In addition, buckets for excavating and leveling earth and sand, or baskets for lifting loads and people are used.
図 1 に 記構成の フ 卜 卜 ラ ッ ク に備え られる油圧回路の回路図 を示す なお 、 図 1 の回路図 1<-あいては 、 本発明の説明 に直接関係 がないため ブ一厶 5 を伸縮させるための油圧回路が省略されてい るが プ ―厶 5 は複数段、 例えば 5 段で伸縮可能とな つ ている。 図 1 よ 明 らかなよ う に、 本実施形態に係る油圧回路は 、 油圧源 である油圧ポ ンプ 1 0 *— \ 油圧ポンプ 1 0 よ り 起伏シ ンダ 7 に供 給さ れる圧油の流れを制御する方向制御弁 1 1 と 、 油圧ポ ンプ 1 0 よ り チル 卜 ン リ ンダ 8 に供給される圧油の流れを制御する方向制御 弁 1 2 と 方向制御弁 1 1 の操作装置 1 3 と、 方向制御弁 1 2 の操 作衣置 1 4 と 、 方向制御弁 1 1 と起伏シ リ ンダ 7 と を接 iする管路 FIG. 1 shows a circuit diagram of a hydraulic circuit provided in the float truck having the above configuration. The circuit diagram 1 <-in FIG. 1 has no relation to the description of the present invention because the circuit diagram 1 <- Although the hydraulic circuit for expanding and contracting the air is omitted, the arm 5 can be expanded and contracted in multiple stages, for example, five stages. As can be seen from FIG. 1, the hydraulic circuit according to the present embodiment is configured such that the flow of the hydraulic oil supplied to the undulating cylinder 7 from the hydraulic pump 10 * — \ Control valve 11 for controlling the flow of hydraulic oil supplied to tilt cylinder 8 from hydraulic pump 10 and operating device 13 for directional control valve 11 and directional control valve 11 The pipe connecting the operating clothes 14 of the directional control valve 12 and the directional control valve 11 and the undulating cylinder 7
3 5 3 6 と 、 管路 3 5 (起伏シ リ ンダ 7 の伸び動作側管路) に設 け られた力 ク ンタ ― Λラ ンス弁 1 5 と 方向制御弁 1 2 とチル ト シ3 5 3 6 and the force provided on the pipe 3 5 (the pipe on the extension operation side of the up-and-down cylinder 7)-Permanent valve 15 and directional control valve 12 and tilt switch
U ンダ 8 とを接続する管路 3 1 3 2 と 、 管路 3 Ί (チル 卜 シ リ ン ダ 8 の伸び動作側管路 ) に設け られた力 1ク ンタ ーバラ :ンス弁 1 6 と 、 管路 3 1 と レベ リ ングシ リ ンダ 9 のポ 卜厶室 9 a とを接続する管路A conduit 3 1 3 2 for connecting the U Sunda 8, line 3 I force 1 click provided (chill Bok Shi Li down elongation operation side conduit da 8) pointer Bara: a Nsu valve 1 6, A pipe connecting the pipe 31 to the port chamber 9a of the leveling cylinder 9
( レベ U ングシ リ ンダ 9 の伸び動作側管路) 3 3 と、 管路 3 2 と レ ベ U ングシ U ンダ 9 の口 ッ ド室 9 b と を接続する管路 3 4 と 、 油圧 ポンプ Ί 0 の出口管路 3 0 と タ ンク 1 8 とを接続する管路に設け ら れた U リ ―フ弁 1 7 とか ら構成されてお リ 、 操作装置 1 3 1 4 は、 それぞれ操作 レバ ― 1 3 a 1 4 a と 減圧弁 1 3 b 1 4 b と、 ノ ィ P V 卜圧を供給するパイ P ッ 卜ポ ンプ 4 0 とか ら 成されてい ス 本実施形態では 起伏シ リ ンダ 7 の伸び動作側管路 3 5 と レペ リ ングシ U ンダ 9 の伸び動作側管路 3 3 とを接続する管路 3 7 が設け られ の管路 3 7 には、 第 1 切換弁 2 1 と、 操作装置 1 3 のブー 厶上げ操作によ つ て切 り 換え られ 、 第 1 切換弁 2 1 のパィ 口 ッ 卜ポ(The pipeline on the extension operation side of the leveling cylinder 9) 3 3, a pipeline 34 connecting the pipeline 32 to the opening chamber 9b of the leveling cylinder 9, and a hydraulic pump Ί The U-leaf valve 17 provided in the line connecting the outlet line 30 of the tank 0 and the tank 18 is provided. 13a 14a, a pressure reducing valve 13b 14b, and a pi-pump pump 40 for supplying a negative PV pressure. In the present embodiment, the extension of the undulating cylinder 7 is achieved. A pipe 37 connecting the operating pipe 35 to the extension pipe 3 3 of the repelling cylinder U 9 is provided.The pipe 37 has a first switching valve 21 and an operation valve. It is switched by the boom-up operation of the device 13 and the port of the first switching valve 21
―卜 2 1 d に起伏シ ンダ 7 の伸び動作側管路 3 5 の圧力を供給す る第 2 切換弁 2 0 とが設け られている なお、 第 1 切換弁 2 1 に備 え られた戻 しばね 2 1 c によ つ て pX At.される第 1 切換弁 2 1 の 定 圧 も し < は切換 SX定圧は U U フ弁 1 7 の 5 ML圧よ リ もやや低 い値に 5 される o なお 5 -2nd d is provided with a second switching valve 20 for supplying the pressure of the elongating cylinder 7 on the extension operation side of the undulating cylinder 7, and is provided for the first switching valve 21. If the constant pressure of the first switching valve 21 is changed to pX At by the return spring 21c obtained, if <is the switching SX constant pressure is slightly lower than the 5ML pressure of the UU valve 17 O 5
特許 a 求の皐 B囲 にい う 連通する手段は 目 'J記第 1 切換弁 2 1 と前記第 2 切換弁 2 0 と の組合せか ら構成され ている 0  The means for communicating in the area B of the patent a is constituted by a combination of the first directional control valve 21 and the second directional control valve 20 described in J.
才ぺ レ ―夕が操作 レバ ― 1 4 a を操作 し ハ。ィ □ V 卜ポ ―卜 1 2 d に ィ P ッ 卜圧を供給 して方向切換弁 1 2 を中立位置 1 2 b か ら 位置 1 2 a に切 り 換える と 、 /由圧ポンプ 1 0 か ら 吐出された圧油が 管路 3 0 方向切換弁 1 2 及び管路 3 2 を通つ てチル 卜 シ ンダ 8 の P ソ 室 8 b に供給されるので 、 チル 卜 シ リ ンダ 8 が縮み方向 に 動作 し ァ夕 ツチメ ン 卜 6 が下げ方向 ( D方向 ) に回動する o チル 卜 シ U ンダ 8 の縮 動作に伴つ てチル 卜 シ ンダ 8 のポ 卜厶室 8 a か ら押 し 出された作動油は 、 力 ゥ ンタ ―ノ、'ラ ンス弁 1 6 路 3 1 及び方向切換弁 1 2 を通つ てタ ンク 1 8 に庆される o  Operate the receiver. Operate the lever 14a. When the directional valve 12 is switched from the neutral position 12b to the position 12a by supplying the pit pressure to the V top port 12d, the / primary pressure pump 10 The pressure oil discharged from the cylinder is supplied to the P-so chamber 8b of the tilt cylinder 8 through the pipe 30 and the directional switching valve 12 and the pipe 32, so that the tilt cylinder 8 contracts. The tilting lever 6 moves in the direction of rotation and rotates in the downward direction (D direction) .o The tilting cylinder 8 is pushed from the pot chamber 8a of the tilting cylinder 8 as the cylinder 8 contracts. The discharged hydraulic oil is supplied to the tank 18 through the power valve 16, the balance valve 16, the path 31, and the directional valve 12.
れに対 して、 才ぺ レ ―夕が操作 レバ ― 1 4 a を m作 し パ □ ソ 卜ポ ―卜 1 2 e にパィ □ V 卜圧を供給 して方向切換弁 1 2 を位 On the other hand, the control lever is operated by the control lever 14 14 m and the power is supplied to the power port 12 e.
1 2 c に切 り 換えた ^ 口'には、 油圧ポンプ 1 0 か ら吐出された圧油 が管路 3 0 、 方向切換弁 1 2 管路 3 1 及び力 ゥ ン夕 ―ノ ラ ンス弁At the 口 port 'switched to 12 c, the pressure oil discharged from the hydraulic pump 10 is connected to the line 30, the directional control valve 12, the line 31, and the power supply-noise valve
1 6 に け られた 止弁 1 6 a を通つ てチル 卜 シ リ ンダ 8 のボ 卜 厶 室 8 a に供給されるので チル 卜 シ リ ンダ 8 が伸び方向 に動作 し ァ夕 ッ チメ ン 卜 6 が上げ方向 ( C方向 ) に回動する o チル 卜 シ U ン ダ 8 の伸び動作に伴つ てチル 卜 シ リ ンダ 8 の Π ッ 卜'室 8 b か ら押 し 出さ れた作動油は 管路 3 2 及び方向切換弁 1 2 を通つ て夕 ンク 1It is supplied to the bottom chamber 8a of the tilt cylinder 8 through the stop valve 16a provided to the cylinder 16 so that the tilt cylinder 8 operates in the extending direction and the tilt cylinder is operated. The tilt 6 rotates in the raising direction (C direction). O The tilt cylinder 8 is pushed out of the tilt chamber 8 b of the tilt cylinder 8 with the extension operation of the cylinder 8. Oil flows through line 3 2 and directional valve 12
8 に戻される o O returned to 8
また 才ペ レ 夕が操作 レバ 1 3 a を操作 し、 パィ P ッ 卜ポ ― 卜 1 1 d にパイ □ V 卜圧を供給 し 、 方向切換弁 1 1 を中立位置 1 1 b か ら位置 1 1 a に切 り 換える と 、 油圧ポンプ 1 0 から吐出された 圧油が管路 3 0 方向切換弁 1 1 、 管路 3 5 力 ゥ ン夕 ―バラ ンス 弁 1 5 に PRけ られた逆止弁 1 5 a 通フ て起伏シ リ ンダ 7 のボ 卜 厶 室 7 a に供給されるので 起伏シ リ ンダ 7 が伸び方向 に動作 し ブ 一厶 5 が上げ方向 ( A方向 ) に回動する。 起伏シ リ ンダ 7 の伸び動 作に伴つ て起伏シ リ ンダ 7 の ロ ッ ド室 7 か ら押 し出 された作動油 は 、 管路 3 6 、 方向切換弁 1 1 ¾通つ てタ ンク 1 8 に戻される。 ブIn addition, the operator operates the operating lever 13a to supply the pilot pressure to the pilot port 11d, and moves the directional control valve 11 from the neutral position 1 1b to the position 1 When switched to 1 a, the hydraulic oil discharged from the hydraulic pump 10 was released to the line 30, the directional valve 11, and the line 35. The undulating cylinder 7 is supplied to the bottom chamber 7a of the undulating cylinder 7 through the valve 15a, so that the undulating cylinder 7 operates in the extension direction and 1 turns in the up direction (A direction). Hydraulic oil pushed out from the load chamber 7 of the up-and-down cylinder 7 with the extension movement of the up-and-down cylinder 7 flows through the pipe 36 and the directional valve 11. Returned to link 18 B
―ム 5 が上げ方向 に回動さ れる と、 レベ リ ングシ リ ンダ 9 が強制的 に伸ばされ 、 レベ リ ングシ V ンダ 9 の P ッ ド室 9 b か ら作動油が押 し出 されるので、 その作動油が管路 3 4 及び管路 3 2 を通 てチル 卜 シ リ ンダ 8 の ロ ッ ド室 8 b に流 Λ し 、 チル 卜 シ リ ンダ 8 が縮み方 向 に動作 して、 アタ ッチメ ン 卜 6 が下げ方向 ( 1 D方向) に回動する。 チル 卜 シ U ンダ 8 の縮み動作に伴っ てチル 卜 シ リ ンダ 8 のポ 卜厶室-When the arm 5 is rotated in the upward direction, the leveling cylinder 9 is forcibly extended and the hydraulic oil is pushed out from the padding chamber 9 b of the leveling cylinder V 9. Then, the hydraulic oil flows into the rod chamber 8b of the tilt cylinder 8 through the pipes 34 and 32, and the tilt cylinder 8 operates in a contracting direction. Attachment 6 rotates in the downward direction (1D direction). The tilt chamber of the tilt cylinder 8 accompanies the shrinkage of the tilt cylinder 8
8 a か ら押 し出された作動油は、 カ ウ ンタ ーパラ ンス弁 1 6 、 管路8 The hydraulic oil pushed out from a is supplied to the counter balance valve 16
3 1 及び管路 3 3 を介 して レベ リ ングシ リ ンダ 9 のポ 卜厶室 9 a に 導かれる その結果、 ブー厶 5 の上げ 木作に応 じて、 車体 1 に対す る ァタ ツ チメ ン ト 6 の上下方向の相対的な角度が変更され 、 自動的 にブーム上げ操作前の状態に保持される It is led to the pot room 9a of the leveling cylinder 9 via the pipe 31 and the pipe 33. As a result, the ratchet for the car body 1 is formed in response to the raised wood of the boom 5. The relative angle of the chimney 6 in the vertical direction is changed and automatically maintained at the state before the boom raising operation
ブーム上げ用のパイ 口 ッ 卜圧が第 2 切換弁 2 0 のパイ 口 V 卜ポー 卜 2 0 d に作用 していない場 。 、 笛 ゥ 切換弁 2 0 は位置 2 0 a に保 持される この と き、 第 1 切換弁 2 1 のパィ 口 ッ トポー 卜 2 1 d に は.タ ンク圧 しか作用 しないので、 第 1 切換弁 2 1 は位置 2 1 a に保 持され、 管路 3 1 と管路 3 7 とが遮断される と ±t、 に管路 3 1 と管路 When the pie port pressure for raising the boom is not acting on the pie port V port 20 d of the second switching valve 20. The whistle ゥ switching valve 20 is held at the position 20a. At this time, only the tank pressure acts on the port port 21d of the first switching valve 21. Valve 21 is held in position 21a, and when lines 31 and 37 are cut off ± t, lines 31 and
3 3 とが第 1 切換弁 2 1 を介 して連通される。 3 3 is communicated via the first switching valve 21.
これに対 して、 才ぺ レー夕が操作 レ 一 1 3 a を操作 し 、 パイ 口 ソ 卜 ポー 卜 1 1 e にパイ 口 ソ ト圧を供給 し、 方向切換弁 1 1 を室 1 On the other hand, the operator operates the operation lever 13a to supply the pie port sort pressure to the pie port sort port 11e, and sets the directional control valve 11 to the room 1.
1 c に切 換えた場合には 、 油圧ボンプ 1 0 か ら 吐出された圧油が 管路 3 0 、 方向切換弁 1 1 及び管路 3 6 通つ て起伏シ リ ンダ 7 のWhen the pressure is switched to 1c, the hydraulic oil discharged from the hydraulic pump 10 passes through the pipe 30, the directional switching valve 11 and the pipe 36, and the hydraulic oil is discharged from the undulating cylinder 7 through the pipe 36.
P ッ ド至 7 b に供給されるので、 起伏シ リ ンダ 7 が縮み方向 に動作 し 、 ブ一ム 5 が下げ方向 ( B 方向) に回動する 起伏シ リ ンダ 7 の 縮み動作に伴っ て起伏シ リ ンダ 7 のポ 卜厶室 7 a か ら押 し出された 作動油は 、 カ ウ ンタ ーノ ラ ンス弁 1 5 、 管路 3 5 及び方向切換弁 1The undulating cylinder 7 is supplied to the P pod 7b, so that the undulating cylinder 7 operates in the contracting direction, and the bump 5 rotates in the lowering direction (the B direction). Hydraulic oil pushed out from the port chamber 7a of the up-and-down cylinder 7 is a counterbalance valve 15, a pipeline 35 and a directional control valve 1.
1 ¾ offlつ てタ ンク 1 8 に戻される。 ブ '一厶 5 が下げ方向 に回動され る と 、 レベ リ ングシ リ ンダ 9 が強制的 に縮め られ、 レべ リ ングシ リ ンダ 9 のボ トム 9 a か ら作動油が押 し出されるので、 その作動油 が管路 3 3 、 管路 3 1 及び力 ゥ ン夕一バラ ンス弁 1 6 の逆止弁 1 6 a を通つ てチル 卜 シ υ ンダ 8 のポ 卜厶室 8 a に流入 し チル ト シ リ ンダ 8 が伸び方向 に動作 して 、 ァ夕 ツチメ ン ト 6 が上げ方向 ( C方 向 ) に回動する チル 卜 シ リ ンダ 8 の伸び動作に伴つ てチル 卜 シ リ ンダ 8 の □ V ド室 8 b か ら押 し出 された作動油は、 管路 3 2 及び管 路 3 4 を介 して レベ リ ングシ リ ンダ 9 のロ ッ ド室 9 b に導かれる。 その結果 、 ブーム 5 の下げ操作に関わ り な く 、 車体 1 に対する ァタ ソチメ ン 卜 6 のチル 卜角度が自動的 にブーム上げ操作 の状態に保 たれる。 1 ¾ offl is returned to tank 18. When the vehicle 5 is rotated in the downward direction, the leveling cylinder 9 is forcibly contracted, and the leveling cylinder 9 is forcibly retracted. The hydraulic oil is pushed out from the bottom 9 a of the cylinder 9, and the hydraulic oil flows through the pipes 33, 31 and the check valve 16 a of the power balance valve 16. Then, it flows into the port chamber 8 a of the tilt cylinder 8, the tilt cylinder 8 operates in the extending direction, and the rotary clamp 6 rotates in the raising direction (the direction C). The hydraulic oil pushed out of the □ V chamber 8 b of the tilt cylinder 8 due to the extension operation of the tilt cylinder 8 passes through the pipes 32 and 34. To the loading chamber 9 b of the leveling cylinder 9. As a result, regardless of the operation of lowering the boom 5, the tilt angle of the battery 6 with respect to the vehicle body 1 is automatically maintained at the state of the boom raising operation.
才ペ レ一夕 によ 【リ ブ ―厶上げ操作が行われる と 、 操作装置 1 3 か らのパイ □ ッ 卜圧 によ y 方向切換弁 1 1 が位置 1 1 a に切 リ 換え ら れる と共 に第 2 切換弁 2 0 が位置 2 0 b に切 り 換え られる れ よ り 、 油圧ボンプ 1 0 か ら吐出された圧油が管路 3 0 、 方向切換弁 When the lift-up operation is performed, the y-direction switching valve 11 is switched to the position 11a by the pilot pressure from the operating device 13. At the same time, the second switching valve 20 is switched to the position 20b, so that the pressure oil discharged from the hydraulic pump 10 is supplied to the pipeline 30 and the directional switching valve.
1 1 、 管路 3 5 、 力 ゥ ン夕一バラ ンス弁 1 5 の逆止弁 1 5 a を; ιίつ て起伏シ リ ンダ 7 のボ 卜厶室 7 a に供給される と共に 第 2 切換弁11, pipeline 35, power valve balance valve 15, check valve 15 a, and supply to bottom chamber 7 a of up-and-down cylinder 7 and second switching valve
2 0 が位置 2 0 b に切 換え られている こ とか ら、 管路 3 5 の圧力Since 20 has been switched to position 20b, the pressure in line 35
(起伏シ リ ンダ 7 の作動圧) が管路 3 7 を介 して第 1 切換弁 2 1 の イ ロ ッ 卜 ポー 卜 2 1 d にも作用する。 起伏シ リ ンダ 7 の作動圧は、 ァ夕 ツ チメ ン 卜 6 によ つ て持ち上げよ う とする荷物の重量が大き い ほど大き く なる (The operating pressure of the undulating cylinder 7) also acts on the outlet port 21d of the first switching valve 21 via the line 37. The operating pressure of the undulating cylinder 7 increases as the weight of the luggage to be lifted by the anchor 6 increases.
起伏シ リ ンダ 7 の作動圧が第 1 切換弁 2 1 の設定圧よ U も低い場 には、 第 1 切換弁 2 1 が位置 2 1 a に保持されるので 、 管路 3 1 と管路 3 7 との遮断状態及び管路 3 1 と管路 3 3 との連通状態が維 持される 。 したがつ て この場合に も、 前記の手順でブ ―厶 5 の上 げ操作及びブ一厶 5 の上げ操作に伴う アタ ッ チメ ン ト 6 のチル ト角 度の調整操作が行われる  When the operating pressure of the undulating cylinder 7 is lower than the set pressure of the first switching valve 21 by U, the first switching valve 21 is held at the position 21a. The state of interruption to 37 and the state of communication between pipeline 31 and pipeline 33 are maintained. Therefore, also in this case, the operation for raising the boom 5 and the operation for adjusting the tilt angle of the attachment 6 accompanying the raising operation of the boom 5 are performed in the above-described procedure.
起伏シ リ ンダ 7 の作動圧が第 1 切換弁 2 1 の設定圧よ リ 局 レ、場 には、 第 1 切換弁 2 1 が位置 2 1 b に切 り 換え られるので、 管路 The operating pressure of the up / down cylinder 7 is lower than the set pressure of the first switching valve 21.In some cases, the first switching valve 21 is switched to the position 21b.
3 3 と管路 3 5 とが管路 3 7 を介 して接続される と共に 、 管路 3 1 と夕 ンク 1 8 とが接続される。 このため 油圧ポ ンプ 1 0 か b吐出 された圧油が管路 3 0 方向切換弁 1 1 管路 3 5 を Mつ て起伏シThe pipe 3 3 and the pipe 3 5 are connected via the pipe 3 7 and the pipe 3 1 Is connected to evening 18. For this reason, the hydraulic oil discharged from the hydraulic pump 10 or b moves up and down the pipe 30 through the directional control valve 11 and the pipe 35.
U ンダ 7 のポ 卜厶室 7 a に供給される と ±tに 管路 3 5 中の圧油のWhen supplied to the pot chamber 7a of the U
―部が管路 3 7 切換弁 2 1 、 管路 3 3 を通つ て レベ リ ングシ リ ン ダ 9 のボ 卜 厶室 9 a に供給 れる。 れによ 、 起伏シ リ ンダ 7 と レベ リ ングシ リ ンダ 9 の双方に伸び方向の力が生 じ これ らがブ一 厶 5 を上げ方向 に回動させる力 と して作用するので 起伏ン リ ンダ 単独でプ一厶 5 を上げ方向 に回動させる場 口 に比ベて 、 油圧作業機 の フ ト能力が高め られる The part is supplied to the bottom chamber 9a of the leveling cylinder 9 through the pipe 37 switching valve 21 and the pipe 33. As a result, a force in the extension direction is generated on both the up-and-down cylinder 7 and the leveling cylinder 9, and these act as a force for rotating the boom 5 in the up direction. The foot capacity of the hydraulic working machine is increased as compared to the case where the program 5 is rotated alone in the raising direction.
なお、 本 施形態では 作装置 1 3 1 4 は油圧パィ 口 ッ 卜方式 のものを例示 しているが 電気操作式のあのを使用する こ と もでき る この場合には 操作 レバー 1 3 a の操作によ り m が出力 され 、 操作 レ A― 1 3 a の操作によ つ て出力 された i によ つ て第 2 切換弁 2 0 を切 り 換ん *¾)よ に構成す  In this embodiment, the working device 13 14 is exemplified by a hydraulic pad type. However, an electrically operated type can be used. In this case, the operating lever 13 a M is output by the operation, and the second directional control valve 20 is switched by the i output by the operation of the operation A-13a.
また、 図 1 の構成において、 方向制御弁 1 1 のプ一厶上げ側へ切 換える側のパィ □ッ 卜 ポ一 卜 1 1 d に接祝されたパィ □ 卜 回路 に圧力検出器を設け の圧力検出器によ 圧力変換を検出 し 、 そ ヽ  In addition, in the configuration of FIG. 1, a pressure detector is provided in the port circuit that is connected to the port port 1 1d on the side that switches the direction control valve 11 to the up position. Pressure conversion is detected by the pressure detector, and
の検出信号 ( 信 を例えば電気油圧変換弁 によ り 圧力 に変換 して第 2 切換弁 2 0 のパィ ロ ッ 卜ポー 卜 2 0 d に導いて第 2 切換弁Is converted into pressure by, for example, an electro-hydraulic conversion valve, and is led to the pilot port 20 d of the second switching valve 20 to be switched to the second switching valve.
2 0 を切 リ 換える よ う に構成する こ と もでさ る It can be configured to switch 20
さ ら に、 本実施形態では 、 第 1 及び第 2 切換弁 2 1 , 2 0 によ つ て管路 3 7 を連通させる切換手段を構成 しているが 管路 3 7 と、 方向制御弁 1 1 を ブ一厶上げ側へ切 り 換える側のハ。ィ □ ッ 卜 ポ一 卜 Further, in the present embodiment, the switching means for connecting the pipe 37 with the first and second switching valves 21 and 20 is constituted. However, the pipe 37 and the directional control valve 1 are provided. C on the side that switches 1 to the boom-up side. □ Cut port
1 1 d に接続されたパィ Ρ ッ 卜回路と にそれぞれ圧力検出器を配置 し 管路 3 7 の圧力が予め設定 した圧力よ 大さ く かつ 方向制 御弁 1 1 がブ一厶上げ側 に切 り 換わつ た と をそれぞれの圧力検出 器か らの信号によ て制御装置が検出 した と さ に、 当該制御装置か らの制御信号によ つ て第 1 切換弁 2 1 を切 換えるよ う に構成する と もでき る なお の切 り 換えは 記制御装置か らの制御信 を例えぱ電気油圧変換弁によ り 圧力 に変換 し 、 第 1 切換弁 2 1 の パィ 口 ッ 卜ポ一 卜 2 1 d に圧力を印加する こ と によ り 行われる。 このよ ラ に 、 本実施形態に係る油圧作業機は、 起伏シ U ンダ 7 の 伸び動作側管路 3 5 と レベ リ ングシ リ ンダ 9 の伸び動作側管路 3 3 と を接 iする管路 3 7 に予め設定された圧力値で管路 3 5 , 3 3 と の連通状態を変更する手段 (切換弁 2 0 , 2 1 ) ¾:備え ブーム上 げ操作時における起伏シ リ ンダ 7 の作動圧が回路切換手段の設定圧 よ り も 向 < な た と さ に各伸び動作側管路 3 3 , 3 5 が連通されて, 油圧ポ ンプ 1 0 か ら吐出された圧油が起伏シ リ ンダ 7 の伸び動作側 及びレベ ングシ ンダ 9 の伸び動作側の双方に供給される ラ に したので 、 レベ リ ングシ リ ンダ 9 の伸張力 もブ一厶を回動させる駆 動力 と して利用する とが可能とな 、 <—れによ り 油圧作業機の リ フ 卜能力を问める し とができ る Pressure sensors are arranged in each of the pipe circuits connected to 11d, and the pressure in line 37 is greater than the preset pressure, and the directional control valve 11 is on the boom-up side. When the control device detects that switching has been performed by a signal from each pressure detector, the first switching valve 21 is switched according to the control signal from the control device. In this case, the control signal from the control device is converted into pressure by an electro-hydraulic conversion valve, and the first switching valve 21 is switched. This is performed by applying pressure to the pipe port 21d. As described above, the hydraulic working machine according to the present embodiment includes a pipe connecting the extension operation side pipe 35 of the undulating cylinder 7 and the extension operation side pipe 33 of the leveling cylinder 9. Means for changing the communication state with the pipelines 35 and 33 with the pressure value preset in 37 (switching valves 20 and 21) ¾: Provided Operation of the up-and-down cylinder 7 during the boom raising operation When the pressure is less than the set pressure of the circuit switching means, the respective extension operation side pipes 33 and 35 are connected, and the pressure oil discharged from the hydraulic pump 10 is raised and lowered. Since it is supplied to both the extension operation side of the cylinder 7 and the extension operation side of the leveling cylinder 9, the extension tension of the leveling cylinder 9 is also used as a driving force for rotating the beam. The lifting capacity of the hydraulic working machine can be increased by
また 、 油圧作業機の 0 フ 卜能力を犠牲にする こ とな < 起伏シ リ ン ダ 7 の受圧囬-積の小开画 化を図る し とが可能とな り 、 れによ リ 油圧 作業機の低コ ス 卜化を図る こ とがでさ る。  In addition, it is possible to reduce the pressure receiving area of the up-and-down cylinder 7 without sacrificing the zero-floating capacity of the hydraulic working machine. The cost of the machine can be reduced.
さ ら に 本例の油圧作業機 よ、 油圧ポンプ 1 0 か ら 吐出された圧 油を レベ U ングシ ンダ 9 に供給するための手段を 2 つの切換弁 2 Further, in the hydraulic working machine of this example, a means for supplying the hydraulic oil discharged from the hydraulic pump 10 to the leveling cylinder 9 is provided by two switching valves 2.
0 , 2 1 によ て構成 したので、 汎用品の組合せで構成する こ とが 可能とな Since it is composed of 0 and 21, it can be composed of a combination of general-purpose products.
なお 、 前記連通させる手段は、 本実施形態では第 1 切換弁 2 1 お よび第 2 切換弁 2 0 によ つ て構成されているが、 プ一厶上げ操作時 における第 1 のシ U ンダの作動圧が予め設定 した圧力 よ )咼 な つ たと さ に 、 第 1 のン ンダの伸び動作を行わせる側 と第 3 のシ リ ンダの伸び動作を行わせる側 とを連通させる機能を備えていれば前 記切換弁 2 1 2 0 の組み合わせに限定される ものではなく 、 必要 に応 じて適宜 B3Z.計する し とができる  In the present embodiment, the communicating means is constituted by the first switching valve 21 and the second switching valve 20. However, the first cylinder during the raising operation of the pump is operated. (The operating pressure is the pressure set in advance.) In addition, a function is provided to connect the side that performs the extension operation of the first cylinder and the side that performs the extension operation of the third cylinder. If this is the case, the present invention is not limited to the combination of the above-mentioned switching valves 2 1 and 2 0, but can be appropriately measured as needed.

Claims

請 求 の 範 囲  The scope of the claims
1 が固定側に回動可能に取 リ 付けられたプ 厶 と 1 is a fixedly rotatable program and
記ブ ―厶の他端側を 自 由端と して起伏方向 に回動させる第 1 の シ リ ンダと  A first cylinder that rotates in the undulating direction with the other end of the beam as a free end;
iu記プ ―厶の先端部に回動可能に取 リ 付け られたァタ ソチメ ン 卜 m記プ ―厶 に対 して m記ァ夕 ッチメ ン 卜 を上下方向 に回動さ せる 第 2 のン U ンダと  The second pivot is to vertically rotate the m-connection element with respect to the m-program, which is rotatably attached to the tip of the iu-program. And U
記ブ 厶の起伏動作に連動 して伸縮 し、 ブ ―厶の起伏角度 の変化に応 じて目 IJ記ァタ ッチメ ン 卜の上下方向の角度を予め 定 し た角度に保持する第 3 のシ リ ンダと  A third type that expands and contracts in conjunction with the up-and-down movement of the boom, and holds the vertical angle of the eye IJ attachment at a predetermined angle in response to a change in the up-and-down angle of the boom. With the cylinder
記第 1 及び第 2 のシ リ ンダにそれぞれ圧 》 '田 ¾供給する油圧ポン プと  Pressure on the first and second cylinders, respectively.
当該油圧ポンプか り m記第 1 及び第 2 の シ リ ンダにそれぞれ供給 される圧油の流れを制御する方向制御弁と、  A directional control valve for controlling the flow of pressure oil supplied to the first and second cylinders from the hydraulic pump;
当該方向制御弁を切換操作する操作装置と  An operating device for switching the directional control valve;
を備えた油圧作業機の油圧制御装置において Hydraulic control device for hydraulic working machine with
ブ ―厶上げ操作時における前 第 1 のシ リ ンダの作動圧が予め 定 した圧力 よ り も |¾ < /よ つたと さ に w\記第 1 のシ リ ンダの伸び動 作を行わせる側 と 則目己第 3 のシ ンダの伸び動作を行わせる側 と を 連通さ せる手段を備えている «_ と を特徴とする油圧作業機の油圧制 御装置  When the operating pressure of the first cylinder during the raising operation is lower than the predetermined pressure, the first cylinder is extended by || The hydraulic control device of the hydraulic working machine, characterized in that the hydraulic control device is provided with means for communicating the side and the side that performs the extension operation of the third cylinder.
2 記連通させる手段が  2 The means of communication
前記第 1 のシ リ ンダの伸び動作を行わせる側に接続された第 1 の 管路および 記第 3 のシ リ ンダの伸び動作を行わせる側に接 され た第 2 の管路を接続する第 3 の管路に設け られている と を特徴と する 求の In囲 1 記載の油圧作業機の油圧制御装置  A first pipe connected to a side of the first cylinder that performs the extension operation and a second pipe connected to the third cylinder that performs the extension of the cylinder are connected. The hydraulic control device for a hydraulic working machine according to claim 1, wherein the hydraulic control device is provided in a third pipeline.
3 記連通させる手段が  3 The means of communication
記第 3 の管路に設け られた 1 の切換弁 と、 ブ一厶上げ操作を フ 前記 ί 作 置の 作に応 じて切 り 換え れ、 記第 1 の管路の圧力を m記第 1 の切換弁のパイ □ソ 卜ポ ―卜 に導 < 第 2 の切換弁 と A switching valve provided in the third pipeline; The boom raising operation is switched in accordance with the operation of the above-described operation, and the pressure of the first pipeline is conducted to the pilot port of the first switching valve. 2 switching valve and
か らなる と を特徴とす 求の in囲 2 記載の油圧作業機の油圧制 御装置 2. The hydraulic control device for a hydraulic working machine according to claim 2, wherein the hydraulic control device comprises:
4 . 記 ί 作装置が油圧パィ □ッ 卜式の操作装置であ m記第 2 の切換弁は 記パィ Ρ ソ 卜ポ ―卜 に刖 sfi油圧パイ ロ ッ 卜圧を導さ - 第 1 の切換弁の切換を行う と を特徴とする請求の ΪΕ囲 3 記載 の油圧作業機の油圧制御装置  4. The operating device is a hydraulic pipe type operation device. The hydraulic control device for a hydraulic working machine according to claim 3, wherein the switching of the switching valve is performed.
5 . 記ブ ―厶が 2 段以上の伸縮機構を備えている こ と を特徴とす 5. The boom has two or more stages of expansion and contraction mechanism.
•6) 5 求の ia囲 1 記載の油圧作業機の油圧制御装置。 • 6) Hydraulic control device for hydraulic working machine described in ia box 1 of 5 above.
6 . 記ァタ ツチメ ン 卜が、 ホ ―ク 、 バスケ ッ 卜 およびバケ ッ 卜の 6. Make sure that the data is stored in the box, basket, and bucket.
1 つを含む <—とを特徴とする am求の範囲 1 記載の油圧作業機の油圧 制御装置 The hydraulic control device for a hydraulic working machine according to claim 1, wherein the hydraulic control device includes one.
7 . 記固 側が前記油圧作業機の -qS 部に設け られている こ と を 特徴とする 5 求の範囲 1 記載の油圧作業機の油圧制御装置  7. The hydraulic control device for a hydraulic working machine according to claim 1, wherein the stationary side is provided in a -qS section of the hydraulic working machine.
8 . 刖記油圧作業機が U フ 卜 卜 ラ ソ ク および高所作業車のいずれか を含む と を特徴とする 求の in囲 1 ない し 7 のいずれか 1 に記載 の油圧作業機の油圧制御  8. The hydraulic working machine according to any one of the above items 1 to 7, wherein the hydraulic working machine includes one of a U-thrust tank and an aerial work vehicle. Control
PCT/JP2004/002380 2003-02-27 2004-02-27 Hydraulic control device of hydraulic working machine WO2004076334A1 (en)

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* Cited by examiner, † Cited by third party
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KR100866633B1 (en) * 2007-05-30 2008-11-03 강남국 A oil pressure device and a alignment circling system thereof
KR101088752B1 (en) * 2009-05-22 2011-12-01 볼보 컨스트럭션 이큅먼트 에이비 hydraulic system with improvement complex operation
CN102030293B (en) * 2010-12-10 2012-09-19 徐州重型机械有限公司 Elevated operation vehicle and platform leveling hydraulic system thereof
CN102616707B (en) * 2011-01-30 2014-10-29 长沙中联消防机械有限公司 Work bucket leveling control device
CN103046590A (en) * 2013-01-30 2013-04-17 江苏柳工机械有限公司 Control method of hydraulic working system of loading machine
CN103629175B (en) * 2013-11-28 2016-05-04 长沙中联消防机械有限公司 Working bucket hydraulic control system and engineering truck
CN104728200B (en) * 2013-12-24 2018-05-15 卡特彼勒(青州)有限公司 Hydraulic system and the loading machine including the hydraulic system
JP6317656B2 (en) * 2014-10-02 2018-04-25 日立建機株式会社 Hydraulic drive system for work machines
JP6291394B2 (en) * 2014-10-02 2018-03-14 日立建機株式会社 Hydraulic drive system for work machines
WO2016186221A1 (en) * 2016-05-31 2016-11-24 株式会社小松製作所 Work machinery control system, work machinery, and work machinery control method
WO2018044871A1 (en) * 2016-08-30 2018-03-08 Clark Equipment Company Power lift
KR101980909B1 (en) * 2018-02-13 2019-05-21 강남국 Incoming auxiliary apparatus for high place working vehicle
CN109610537A (en) * 2018-11-20 2019-04-12 江苏徐工工程机械研究院有限公司 A kind of engineering truck scraper bowl levelling mechanism
DE102019129300A1 (en) * 2019-10-30 2021-05-06 Kramer-Werke Gmbh Power machine with a frame and a pivotable boom
CN112064698A (en) * 2020-08-21 2020-12-11 中联重科股份有限公司 Bucket automatic leveling control method and system based on angle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4822237A (en) * 1985-11-21 1989-04-18 The Gradall Company Extended reach materials handling apparatus
JPH0365765U (en) * 1989-10-27 1991-06-26
JPH061397U (en) * 1992-06-10 1994-01-11 株式会社タダノ Leveling equipment for aerial work vehicles
JP2003034494A (en) * 2001-07-19 2003-02-07 Aichi Corp Leveling device for high lift work vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3545185C1 (en) * 1985-12-20 1987-07-23 Krupp Gmbh Luffing-crane jib
DE4331777C2 (en) * 1993-09-18 1995-07-06 Schaeff Karl Gmbh & Co Wide-angle swivel drive for the basic boom of a loading machine
FR2731729B1 (en) * 1995-03-16 1997-06-06 Soc Et Et D Innovation Dans Le HYDRAULIC CONTROL SYSTEM FOR LOADER
ITBO20000572A1 (en) * 2000-10-03 2002-04-03 New Holland Italia Spa EARTH MOVING MACHINE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4822237A (en) * 1985-11-21 1989-04-18 The Gradall Company Extended reach materials handling apparatus
JPH0365765U (en) * 1989-10-27 1991-06-26
JPH061397U (en) * 1992-06-10 1994-01-11 株式会社タダノ Leveling equipment for aerial work vehicles
JP2003034494A (en) * 2001-07-19 2003-02-07 Aichi Corp Leveling device for high lift work vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1600419A4 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010137971A (en) * 2008-12-12 2010-06-24 Kayaba Ind Co Ltd Control circuit for working machine having travel mechanism
JP2017125353A (en) * 2016-01-14 2017-07-20 株式会社Kcm Loading apparatus for wheel loader
CN107061388A (en) * 2017-04-07 2017-08-18 临工集团济南重机有限公司 It is a kind of to prevent descending from shaking and turning to the lifting working platform Ye Qu mechanisms being emptied
CN107061388B (en) * 2017-04-07 2018-05-01 临工集团济南重机有限公司 It is a kind of to prevent descending from shaking and turning to the lifting working platform Ye Qu mechanisms being emptied
JP2021143510A (en) * 2020-03-11 2021-09-24 株式会社日立建機ティエラ Work machine
JP7165155B2 (en) 2020-03-11 2022-11-02 株式会社日立建機ティエラ working machine

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JPWO2004076334A1 (en) 2006-06-01

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