Classifications

• • 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
  • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
  • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
  • E02F3/432—Control 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
  • E02F3/433—Control 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, 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
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices 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
  • B66F9/065—Devices 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
  • B66F9/0655—Devices 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, 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
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices 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
  • B66F9/075—Constructional features or details
  • B66F9/20—Means for actuating or controlling masts, platforms, or forks
  • B66F9/22—Hydraulic 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)
• Mining & Mineral Resources (AREA)
• General Engineering & Computer Science (AREA)
• Fluid-Pressure Circuits (AREA)
• Operation Control Of Excavators (AREA)
• Jib Cranes (AREA)
• Forklifts And Lifting Vehicles (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=32923369

Family Applications (1)

Country Status (5)

Cited By (4)

Families Citing this family (15)

Citations (4)

Family Cites Families (4)

• 2004
  • 2004-02-27 KR KR1020057015504A patent/KR20050101351A/ko active IP Right Grant
  • 2004-02-27 CN CNA2004800053234A patent/CN1753831A/zh active Pending
  • 2004-02-27 EP EP04715501A patent/EP1600419A4/en not_active Withdrawn
  • 2004-02-27 JP JP2005502952A patent/JPWO2004076334A1/ja not_active Withdrawn
  • 2004-02-27 WO PCT/JP2004/002380 patent/WO2004076334A1/ja not_active Application Discontinuation

Patent Citations (4)

Non-Patent Citations (1)

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