WO2019054234A1 - Équipement de construction - Google Patents

Équipement de construction Download PDF

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Publication number
WO2019054234A1
WO2019054234A1 PCT/JP2018/032747 JP2018032747W WO2019054234A1 WO 2019054234 A1 WO2019054234 A1 WO 2019054234A1 JP 2018032747 W JP2018032747 W JP 2018032747W WO 2019054234 A1 WO2019054234 A1 WO 2019054234A1
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WO
WIPO (PCT)
Prior art keywords
discharge
pumps
pressure
pump
hydraulic
Prior art date
Application number
PCT/JP2018/032747
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English (en)
Japanese (ja)
Inventor
貴雅 甲斐
平工　賢二
宏政 高橋
哲平 齋藤
Original Assignee
日立建機株式会社
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Application filed by 日立建機株式会社 filed Critical 日立建機株式会社
Publication of WO2019054234A1 publication Critical patent/WO2019054234A1/fr

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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
    • 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
    • E02F9/24—Safety devices, e.g. for preventing overload
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

Definitions

  • the present invention relates to a construction machine such as a hydraulic shovel.
  • hydraulic closed circuit system In the hydraulic closed circuit, there is no pressure loss due to the control valve, and since the pump discharges only the necessary flow rate, there is no flow rate loss. In addition, it is possible to regenerate the position energy of the hydraulic actuator and the energy at the time of deceleration. For this reason, energy saving of a construction machine is attained by applying a hydraulic closed circuit system.
  • Patent Document 1 is an example of a hydraulic shovel equipped with a hydraulic closed circuit system. Patent Document 1 enables combined operation and high-speed operation of hydraulic actuators by selectively connecting each of a plurality of hydraulic pumps to any one of a plurality of hydraulic actuators via a switching valve in a closed circuit. The configuration is described.
  • a check valve (check valve) can not be provided in the flow path. Therefore, if, for example, both discharge pumps connected in a closed circuit to the boom cylinder fail, high pressure hydraulic oil in the cap chamber, which is the load holding side of the boom cylinder, flows back to the both discharge pumps, contrary to the operator's intention. As a result, the boom cylinder retracts and the boom may fall.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a construction machine capable of suppressing an unintended operation of a hydraulic actuator even when both discharge type pumps fail in a hydraulic closed circuit system. is there.
  • the present invention provides a plurality of dual discharge pumps, a plurality of hydraulic actuators connected so as to form a closed circuit selectively to the dual discharge pumps, and a plurality of dual actuators.
  • a plurality of switching valves connected between a discharge pump and the plurality of hydraulic actuators, for selectively closing the plurality of dual discharge pumps to the plurality of hydraulic actuators, and operation of the plurality of operation levers
  • Control device for performing the opening / closing control of the plurality of switching valves and the flow control of the plurality of dual discharge pumps according to the plurality of dual discharge pumps, respectively;
  • a construction machine having a drain port for returning, a pressure detector provided in each of the plurality of discharge pumps and detecting a drain pressure of hydraulic oil discharged from the drain port
  • the control device is provided with a device, and when there is a dual discharge pump whose drain pressure detected by the pressure detection device exceeds a predetermined pressure, among the multiple dual discharge pumps, the drain pressure Determines that both discharge pumps whose pressure exceeds a predetermined
  • connection is made to the failed dual discharge pumps. All switching valves being closed are closed. As a result, the backflow of the hydraulic fluid from the hydraulic actuator to the malfunctioning discharge pump is prevented, so that an unintended operation of the hydraulic actuator can be suppressed.
  • FIG. 7 is a diagram showing an example of a table defining the correspondence between each operation of the hydraulic shovel and the open / close command values of the first to fourth switching valves.
  • FIG. 1 is a side view showing a hydraulic shovel according to a first embodiment of the present invention.
  • the hydraulic shovel 100 has a lower traveling body 103 provided with crawler-type traveling devices 8 a and 8 b on both sides in the left-right direction, and an upper revolving structure 102 as a main body pivotally mounted on the lower traveling body 103. And have. On the upper revolving superstructure 102, a cab 101 is provided as an operation room on which an operator rides.
  • the lower traveling body 103 and the upper swing body 102 can be turned via a swing motor 7 as a hydraulic actuator.
  • a base end of a front work implement 104 which is an operating device for performing, for example, excavating work, is rotatably attached.
  • the front side refers to the direction (left direction in FIG. 1) in which the worker who gets on the cab 101 is facing.
  • the front work implement 104 includes a boom 2 on the front side of the upper swing body 102, in which a base end portion is rotatably connected in the vertical direction.
  • the boom 2 operates via a boom cylinder 1 which is a single rod hydraulic cylinder.
  • the tip of the rod 1 b of the boom cylinder 1 is rotatably connected to the upper swing body 102, and the base end of the cylinder tube 1 a of the boom cylinder 1 is rotatably connected to the middle of the boom 2.
  • the proximal end portion of the arm 4 is connected to the distal end portion of the boom 2 so as to be rotatable in the vertical and longitudinal directions.
  • the arm 4 operates via an arm cylinder 3 as a hydraulic actuator which is a single rod hydraulic cylinder.
  • the tip end of the rod 3b of the arm cylinder 3 is rotatably connected to the base end of the arm 4, and the base end of the cylinder tube 3a of the arm cylinder 3 is rotatably connected to the middle of the boom 2 .
  • the base end portion of the bucket 6 is connected to the tip end portion of the arm 4 so as to be rotatable in the vertical direction and the front-rear direction.
  • the bucket 6 operates via a bucket cylinder 5 which is a single rod hydraulic cylinder.
  • the tip of the rod 5b of the bucket cylinder 5 is rotatably connected to the base end of the bucket 6, and the base of the cylinder tube 5a of the bucket cylinder 5 is rotatably connected to the base of the arm 4 There is.
  • a boom control lever 30 (shown in FIG. 2) for operating the boom 2, the arm 4 and the bucket 6 constituting the front work machine 104, an arm control lever 31 (shown in FIG. 2), a bucket lever (Not shown) are arranged.
  • FIG. 2 is a schematic configuration diagram of a hydraulic closed circuit system mounted on the hydraulic shovel 100. As shown in FIG. In addition, in FIG. 2, only the part in connection with the drive of boom cylinder 1 and arm cylinder 3 is shown for simplification of description, and the part in connection with the drive of the other hydraulic actuator is abbreviate
  • the hydraulic closed circuit system 200 selectively connects the first and second pumps of both discharge type (hereinafter appropriately referred to as “both discharge type pumps”) 10 a and 10 b and the first and second pumps. Between the first pumps 10a and 10b and the hydraulic actuators 1 and 3. The hydraulic actuators 1 and 3 connected so as to form the control levers 30 and 31 as operating devices respectively corresponding to the hydraulic actuators 1 and 3 The first to fourth switching valves 11a, 11b, 12a, 12b are connected to selectively connect the first and second pumps 10a, 10b to the hydraulic actuators 1, 3 and 3, respectively, and the operation levers 30, 31.
  • a controller as a control device that performs opening / closing control of the first to fourth switching valves 11a, 11b, 12a, 12b and flow control of the first and second pumps 10a, 10b according to the operation. And a La 40.
  • the first and second pumps 10a and 10b are constituted by dual tilt hydraulic pumps and are driven by an engine (not shown).
  • the first and second pumps 10a and 10b are configured by both motor driven discharge pumps.
  • Both discharge type pumps 10a and 10b respectively adjust the inclination angles of the both tilt swash plate mechanisms 20a and 20b having a pair of supply and discharge ports as flow rate adjustment devices, and the swash plate 52 (shown in FIG. 3).
  • Regulators 21a and 21a for adjusting the displacement volume are provided.
  • the regulators 21 a and 21 b control the discharge direction and the discharge flow rate of both the discharge pumps 10 a and 10 b based on the pump discharge flow rate command value received from the controller 40.
  • both discharge type pumps 10a and 10b also have a function as a regenerative motor driven by hydraulic fluid discharged from the hydraulic actuators 1 and 3.
  • a piston 1c attached to the base end of the rod 1b is provided so as to be capable of reciprocating.
  • a cap chamber 1d is formed on the proximal side of the piston 1c in the cylinder tube 1a
  • a rod chamber 1e is formed on the distal side of the piston 1c in the cylinder tube 1a.
  • a piston 3c attached to the base end of the rod 3b is provided so as to be capable of reciprocating.
  • a cap chamber 3d is formed on the proximal side of the piston 3c in the cylinder tube 3a
  • a rod chamber 3e is formed on the distal side of the piston 3c in the cylinder tube 3a.
  • the switching valves 11a, 11b, 12a, 12b open and close according to the control signal received from the controller 40, and connect both discharge pumps 10a, 10b to the boom cylinder 1 or the arm cylinder 3 in a closed circuit.
  • one supply / discharge port of both discharge pumps 10a is connected to the cap chamber 3d of the arm cylinder 3 through the flow paths L1, L9, L7, and the other supply / discharge port is connected to the flow paths L2, L10, L8.
  • the flow paths L1, L9, L7, L8, L10, and L2 form a closed circuit.
  • one supply / discharge port of both discharge pumps 10b is connected to the cap chamber 1d of the boom cylinder 1 via the flow paths L5, L11, L3, and the other supply / discharge port is connected to the flow paths L6, L12, L4.
  • the flow paths L5, L11, L3, L4, L12, and L6 form a closed circuit, which is connected to the rod chamber 1e of the boom cylinder 1 via the through holes.
  • the oil passage L3 connected to the cap chamber 1d of the boom cylinder 1 and the oil passage L4 connected to the rod chamber 1e are connected to the tank 9 via the flushing valve 13a.
  • the flushing valve 13a absorbs the flow rate difference between the cap side and the rod side of the boom cylinder 1, which is a single rod hydraulic cylinder, by discharging excess hydraulic oil from the low pressure side of the oil passages L3, L4 to the tank 9. .
  • the oil passage L7 connected to the cap chamber 3d of the arm cylinder 3 and the oil passage L8 connected to the rod chamber 3e are connected to the tank 9 via the flushing valve 13b.
  • the flushing valve 13b absorbs the flow difference between the cap side and the rod side of the arm cylinder 3 which is a single rod hydraulic cylinder by discharging excess hydraulic oil to the tank 9 from the low pressure side of the oil passages L7 and L8. .
  • the controller 40 controls the switching valves 11a, 11b, 12a, 12b and the regulators 21a, 21b based on the operation amount of the operation levers 30, 31 and the pressure value of pressure sensors 62a, 62b described later.
  • the switching valve 11a is closed so that one discharge pump 10a is connected to the boom cylinder 1 in a closed circuit.
  • the regulator 21a is controlled so that the hydraulic oil having a flow rate corresponding to the operation amount of the boom operation lever 30 is discharged from the both discharge pumps 10a.
  • the switching valve is such that the two discharge pumps 10a and 10b are connected to the boom cylinder 1 in a closed circuit.
  • the switching valve 12b When the arm 4 is operated at low speed alone (when only the arm control lever 31 is operated small), the switching valve 12b is opened so that one discharge pump 10b is connected to the arm cylinder 3 in a closed circuit. And while closing the switching valve 11a, the regulator 21b is controlled so that the hydraulic oil of the flow volume according to the operation amount of the arm control lever 31 is discharged from the both discharge type pump 10b. On the other hand, when the arm 4 is operated independently at high speed (when only the arm operation lever 31 is operated largely), switching is performed so that the two discharge pumps 10a and 10b are connected to the arm cylinder 3 in a closed circuit.
  • valves 12a and 12b are opened and the switching valves 11a and 11b are closed, and the regulators 21a and 21b are controlled so that hydraulic oil at a flow rate corresponding to the operation amount of the arm operation lever 31 is discharged from both discharge type pumps 10a and 10b. Do.
  • both discharge pumps 10a are connected to the boom cylinder 1 in a closed circuit, and both discharge pumps 10b
  • the switching valves 11a and 12b are opened and the switching valves 12a and 11b are closed so that the closed circuit is connected to the arm cylinder 3, and the hydraulic fluid of the flow rate according to the operation amount of the boom control lever 30 is
  • the regulator 21a is controlled so as to be discharged, and the regulator 21b is controlled so that the hydraulic oil at a flow rate corresponding to the operation amount of the arm control lever 31 is discharged from the both discharge type pumps 10b.
  • Both discharge pumps 10a (10b) have a relief valve 22a (22b) for relieving hydraulic fluid to the other supply / discharge port when the pressure at one supply / discharge port exceeds a predetermined value, and a closed circuit pressure Hydraulic fluid when the discharge pressure of make-up check valves 23a and 24b (23a and 24b) and charge pump 25a (25b) and charge pump 25a (25b) for raising cavitation and becoming higher than a predetermined value
  • These units may be provided separately from the discharge pumps 10a and 10b, although they are integrally provided with a charge relief valve 26a (26b) for relieving the pressure.
  • FIG. 3 is a schematic cross-sectional view of both discharge pumps 10a and 10b.
  • both discharge type pumps 10a (10b) are provided with a casing 50a (50b) and a tilting and swash plate mechanism 20a (20b) disposed in the casing 50a (50b).
  • the both tilt swash plate mechanism 20a (20b) is composed of a shaft 51, a swash plate 52, a cylinder block 53, a plurality of pistons 54, a valve plate 55 and the like.
  • the charge relief valve 26a (26b) and the like are also arranged.
  • the shaft 51 is rotatably supported by the casing 50 a (50 b) via a bearing 56.
  • the swash plate 52 is provided around the shaft 51 so that the inclination angle with respect to the rotation axis of the shaft 51 can be changed.
  • the cylinder block 53 is non-rotatably coupled to the shaft 51 by, for example, spline fitting.
  • the cylinder block 53 has a plurality of cylinder chambers 57 formed around the shaft 51.
  • a piston 54 is provided in each cylinder chamber 57 so as to be capable of reciprocating.
  • Each cylinder chamber 57 intermittently communicates with the supply and discharge ports 58 and 59 through the valve plate 55 when the cylinder block 53 rotates.
  • Each piston 54 rotates around the shaft 51 together with the cylinder block 53, and reciprocates in each cylinder chamber 57 in accordance with the inclination angle of the swash plate 52.
  • the hydraulic oil is sucked from one of the supply and discharge ports 58 (59) and discharged as pressure oil from the other supply and discharge port 59 (58).
  • the inclination angle of the swash plate 52 is changed through the regulators 21a and 21b (shown in FIG. 2), the discharge direction and the discharge flow rate of both discharge pumps 10a (10b) change.
  • the casing 50a (50b) is provided with a drain port 60a (60b) for discharging the hydraulic oil.
  • the drain port 60a (60b) is connected to the tank 9 via a drain pipe 61a (61b).
  • a pressure sensor 62a (62b) as a pressure detection device for detecting the pressure (hereinafter referred to as "drain pressure") of the hydraulic oil discharged from the inside of the casing 50a (50b) to the tank 9 It is provided.
  • drain pressure the pressure of the hydraulic oil discharged from the inside of the casing 50a (50b) to the tank 9 It is provided.
  • the pressure sensor 62a (62b) be disposed closer to the drain port 60a (60b) of the drain pipe 61a (61b). As a result, the difference between the drain pressure detected at the time of failure and the drain pressure detected at the normal time becomes large, so that it is possible to improve the detection accuracy of the failure.
  • the pressure sensor 62a (62b) may be disposed in the casing 50a (50b).
  • FIG. 4 is a control block diagram of the controller 40.
  • the controller 40 includes an operation amount detection unit 41, a vehicle body control calculation unit 42, a pump signal output unit 43, a switching valve signal output unit 44, a pressure detection unit 45, and a failure determination unit 46. ing.
  • the operation amount detection unit 41 detects an operation amount (for example, a pilot pressure) of the boom control lever 30 and the arm control lever 31. Information on the detected amount of operation is sent to the vehicle body control calculation unit 42.
  • an operation amount for example, a pilot pressure
  • the vehicle body control calculation unit 42 sets the first to fourth switching valves 11a, 11b, 12a, 12b based on the operation amount of the boom operation lever 30 and the arm operation lever 31 and the determination result from the failure determination unit 46 described later.
  • the open / close command value and the discharge flow rate command value of the first and second pumps 10a and 10b are set.
  • Information on the set open / close command values of the first to fourth switching valves 11a, 11b, 12a, 12b is sent to the switching valve signal output unit 44.
  • Information on discharge flow rate command values of the set first and second pumps 10 a and 10 b is sent to the pump signal output unit 43.
  • the pump signal output unit 43 outputs a control signal corresponding to the discharge flow rate command value from the vehicle body control calculation unit 42 to the first and second regulators 21a and 21b, and the discharge flow rates of the first and second pumps 10a and 10b. Control.
  • the switching valve signal output unit 44 outputs a control signal corresponding to the open / close command value from the vehicle body control calculating unit 42 to the first to fourth switching valves 11a, 11b, 12a, 12b, and the first to fourth switching valve 11a. , 11b, 12a, 12b are opened and closed.
  • the pressure detection unit 45 detects the pressure values of the first and second pressure sensors 62a and 62b. Information on the detected pressure value is sent to the failure determination unit 46.
  • the failure determination unit 46 determines that the first and second pumps 10a and 10b are normal based on the pressure values of the first and second pressure sensors 62a and 62b (the drain pressures of the first and second pumps 10a and 10b). It is determined whether or not. Information on the determination result is sent to the vehicle control control unit 42.
  • FIG. 5 is a control flow diagram of the controller 40.
  • the control flow shown in FIG. 5 is started after the engine of the hydraulic shovel 100 starts and the controller 40 is powered on.
  • each step constituting the control flow will be described in order.
  • step S1 the failure determination unit 46 acquires the pressure values P1 and P2 of the first and second pressure sensors 62a and 62b from the pressure detection unit 45.
  • step S2 the failure determination unit 46 determines whether the pressure value P1 of the first pressure sensor 62a is larger than the pressure threshold P0.
  • the pressure threshold P0 is a threshold for determining the failure of the first and second pumps 10a and 10b, and is equal to or greater than the maximum drain pressure when the first and second pumps 10a and 10b are normal. Is also set to a slightly lower value.
  • step S3 the vehicle body control calculation unit 42 performs the first and third switching connected to the first pump 10a.
  • the open / close command values of the valves 11a and 12a are set to be closed.
  • the switching valve signal output unit 44 outputs a control signal (closing signal) corresponding to the opening / closing command value (closing) from the vehicle body control calculating unit 42 to the switching valves 11 and 12 to make the first and third switching valves 11a and 12a. Close
  • step S4 the vehicle body control calculating unit 42 sets the discharge flow rate command values of the first and second pumps 10a and 10b to zero (0).
  • the pump signal output unit 43 outputs a control signal corresponding to the discharge flow rate command value (0) from the vehicle body control calculation unit 42 to the regulators 21a and 21b, and the discharge flow rate of the first and second pumps 10a and 10b is zero ( Control to 0).
  • step S4 the controller 40 ends the control and stops the operation of the hydraulic shovel 100.
  • step S2 If it is determined in step S2 that the pressure value P1 is less than or equal to the pressure threshold P0 (NO), the failure determination unit 46 determines that the pressure value P2 of the second pressure sensor 62b is larger than the pressure threshold P0 in step S5. It is determined whether or not.
  • step S6 the vehicle body control calculation unit 42 performs the second and fourth switchings connected to the second pump 10b.
  • the open / close command values of the valves 11 b and 12 b are set to be closed.
  • the switching valve signal output unit 44 outputs a control signal (closing signal) corresponding to the opening / closing command value (closing) to the second and fourth switching valves 11b and 12b, and closes the second and fourth switching valves 11b and 12b. .
  • step S7 the vehicle body control calculation unit 42 sets the discharge flow rate command values of the first and second pumps 10a and 10b to zero (0).
  • the pump signal output unit 43 outputs a control signal corresponding to the discharge flow rate command value (0) to the regulators 21a and 21b to control the discharge flow rate of the first and second pumps 10a and 10b to zero (0).
  • the controller 40 ends the control and stops the operation of the hydraulic shovel 100.
  • step S5 If it is determined in step S5 that the pressure value P2 is less than or equal to the pressure threshold P0 (NO), the operation amount detection unit 41 detects the operation amount of the boom operation lever 30 and the arm operation lever 31 in step S8. .
  • step S9 based on the operation amount of boom operation lever 30 and arm operation lever 31, vehicle body control operation unit 42 opens / closes the first to fourth switching valves 11a, 11b, 12a, 12b and discharge flow rate command.
  • the switching valve signal output unit 44 outputs a control signal corresponding to the opening / closing command value to the first to fourth switching valves 11a, 11b, 12a, 12b, and opens / closes the first to fourth switching valves 11a, 11b, 12a, 12b. .
  • step S10 the vehicle body control calculating unit 42 sets the discharge flow rate command value based on the operation amount of the boom operation lever 30 and the arm operation lever 31.
  • the pump signal output unit 43 outputs a control signal corresponding to the discharge flow rate command value to the first and second regulators 21a and 21b to control the discharge flow rate of the first and second pumps 10a and 10b.
  • the boom 2 and the arm 4 of the hydraulic shovel 100 operate according to the operation of the boom control lever 30 and the arm control lever 31.
  • step S10 the controller 40 repeatedly executes the processes after step S1.
  • FIG. 6 is a diagram showing an operation of the hydraulic closed circuit system 200 when the first pump 10a breaks down while driving the boom cylinder 1 using the first pump 10a.
  • movement of the 1st pump 10a is shown for simplification of description, and the part in connection with operation
  • the first switching valve 11a is opened and the third switching valve 12a is closed (step S9 in FIG. 5).
  • the hydraulic fluid of the flow rate according to the operation amount of the boom operation lever 30 is discharged from the first pump 10a (step S10 in FIG. 5).
  • the boom cylinder 1 supports the weight of the front work implement 104, and the cap chamber 1d of the boom cylinder 1 has a high pressure.
  • FIG. 7 is a schematic configuration diagram of a hydraulic closed circuit system according to the present embodiment.
  • the hydraulic closed circuit system 200A further includes a monitor 33 as a display device and an operation button 32 as an instruction input device, and the controller 40A further includes a monitor output unit 47.
  • the monitor 33 and the instruction input device 32 are disposed in the cab 101.
  • FIG. 8 is a control block diagram of the controller 40A.
  • the operation amount detection unit 41 ⁇ / b> A detects an input signal from the operation button 32 in addition to the operation amounts of the boom operation lever 30 and the arm operation lever 31. Information of the detected operation amount and input signal is sent to the vehicle control control unit 42.
  • the vehicle body control calculation unit 42A is based on the operation amount of the boom operation lever 30 and the arm operation lever 31, the input signal from the operation button 32, and the determination result from the failure determination unit 46, the first to fourth switching valve 11a, The open / close command values of 11b, 12a, 12b and the discharge flow rate command values of the first and second pumps 10a, 10b are set.
  • 9A to 9C are control flow diagrams of the controller 40A.
  • step S5 In the control flow (shown in FIG. 5) in the first embodiment, after the failure of the first pump 10a is detected in step S2 and steps S3 and S4 are executed, or the failure of the second pump 10b is detected in step S5. Then, after executing steps S6 and S7, the controller 40 ends the control and decides to stop the operation of the hydraulic shovel 100, but in the control flow shown in FIGS. 9A to 9C, the second pump is performed after step S4.
  • a process steps SY1 to SY7) for adding the process (steps SX1 to SX6) for operating the hydraulic shovel 100 using only 10b and for operating the hydraulic shovel 100 using only the first pump 10a after step S7 ) Has been added.
  • each added step will be described in order.
  • the monitor output unit 47 outputs the failure information of the first pump 10a to the monitor 33.
  • FIG. 10 is a view showing an example of a display screen of the monitor 33. As shown in FIG.
  • FIG. 10 on the left side of the display screen 33a, a simplified diagram of the hydraulic circuit of the hydraulic closed circuit system 200A is displayed, and the failure location is shaded. Thus, the operator can confirm the failure point. Further, on the right side of the display screen 33a, a message indicating that a failure of the first pump 10a has been detected, and a message inquiring whether to shift from the normal mode to the degeneration mode are displayed.
  • the normal mode is a control mode in which the hydraulic shovel 100 is operated using all the dual discharge pumps 10a and 10b
  • the degenerate mode is a normal dual discharge without using a failed dual discharge pump. It is a control mode in which the hydraulic shovel 100 is operated using only the die pump. The operator can instruct the controller 40 to shift from the normal mode to the degeneration mode by operating the operation button 32.
  • step SX2 based on the information of the input signal from the instruction input device 32, the vehicle body control calculation unit 42 determines whether or not the transition from the normal mode to the degeneration mode is instructed.
  • step SX2 If it is determined in step SX2 that the transition from the normal mode to the degeneration mode is instructed (YES), the vehicle body control calculation unit 42 performs the first to fourth switching of each operation of the hydraulic shovel 100 in step SX3. From the table (a normal table described later) used when the first and second pumps 10a and 10b are both normal, a table defining the correspondence with the open / close command values of the valves 11a, 11b, 12a, 12b Switching to a table (a first degeneration table to be described later) used when one pump 10a breaks down.
  • a table a normal table described later
  • FIG. 11 is a diagram showing an example of a table defining the correspondence between each operation of the hydraulic shovel 100 and the open / close command values of the first to fourth switching valves.
  • the table 70 is a table used when both the first and second pumps 10a and 10b are normal (hereinafter referred to as a "normal table"), and the table 71 has a failure in the first pump 10a.
  • the table 72 is a table (hereinafter referred to as a “first degeneration table”) used in the case where the second pump 10 b fails, and the table 72 is a table (hereinafter referred to as a “second degeneration table”).
  • the first degeneration table 71 since the first pump 10a is not used, the open / close command values of the first and third switching valves 11a and 12a connected to the first pump 10a are closed regardless of the operation of the hydraulic shovel 100. It has become.
  • Each of the tables 70 to 72 is stored in advance in the controller 40, and is referred to by the vehicle control control unit 42.
  • step SX4 the vehicle body control calculation unit 42 acquires the operation amount of the boom operation lever 30 and the arm operation lever 31 from the operation amount detection unit 41.
  • step SX5 the vehicle body control calculation unit 42 refers to the first reduction table 71, and based on the operation amount of the boom operation lever 30 and the arm operation lever 31, the first to fourth switching valves 11a, 11b, 12a, Set the open / close command value of 12b.
  • the switching valve signal output unit 44 outputs a control signal corresponding to the opening / closing command value to the first to fourth switching valves 11a, 11b, 12a, 12b, and opens / closes the first to fourth switching valves 11a, 11b, 12a, 12b. .
  • step SX6 the vehicle body control calculating unit 42 sets the discharge flow rate command value of the second pump 10b based on the operation amount of the boom operation lever 30 or the arm operation lever 31.
  • the pump signal output unit 43 outputs a control signal corresponding to the discharge flow rate command value to the second regulator 21b to control the discharge flow rate of the second pump 10b.
  • the boom 2 and the arm 4 of the hydraulic shovel 100 operate according to the operation of the boom control lever 30 and the arm control lever 31.
  • the controller 40 repeatedly executes the processing of step SX4 and subsequent steps.
  • step SX2 If it is determined in step SX2 that transition from the normal mode to the degeneration mode is not instructed (NO), the controller 40 ends the control and stops the operation of the hydraulic shovel 100.
  • step SY1 to SY6 The process for operating the hydraulic shovel 100 with only the first pump 10a added after step S7 (steps SY1 to SY6) displays the failure of the second pump 10b at step SY1, and the second degeneration at step SY3.
  • the process is the same as steps SX1 to SX6 except that the table 72 is switched to and the second degeneration table 72 is referred to in steps SY5 and SY6, so the description will be omitted.
  • Example of this invention was explained in full detail, this invention is not limited to an above-described Example, A various modified example is included.
  • this invention is not restricted to this, It is applicable to the general construction machinery which drives a several hydraulic actuator by a hydraulic closed circuit.
  • the above-described embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.
  • operation button instruction input device
  • 33 ... monitor display device
  • 33a ... display screen 40, 40A ... controller, 41, 41A ... operation amount detection unit, 42, 42A ... vehicle body
  • Control arithmetic unit 43 Pump signal output unit 44: Switching valve signal output unit 45: Pressure detection unit 46: Failure determination unit 47: Monitor output unit 50a, 50b: Casing 51: shaft 52: Oblique Plate, 53: cylinder block, 54: piston, 55: valve plate, 56: bearing, 57: cylinder chamber, 58 59 ... supply / discharge port, 60a, 60b ... drain port, 61a, 61b ... drain piping, 62a ... first pressure sensor (pressure detection device), 62b ...
  • second pressure sensor pressure detection device
  • 70 normal table
  • 71 ... 1st degeneration table
  • 72 ... 2nd degeneration table
  • 100 ... hydraulic excavator, 101 ... cab, 102 ... upper revolving unit, 103 ... lower traveling unit, 104 ... front work machine, 200, 200 A ... hydraulic closed circuit system, L ⁇ L12 ... Flow path.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Operation Control Of Excavators (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

L'invention concerne un équipement de construction permettant de supprimer le fonctionnement involontaire d'un actionneur hydraulique, même lorsqu'une pompe à double refoulement tombe en panne dans un système à circuit fermé hydraulique. Le système à circuit fermé hydraulique (200) est muni de capteurs de pression (62a, 62b) destinés à détecter la pression d'évacuation de l'huile active évacuée à partir des orifices d'évacuation (60a, 60b) d'une pluralité de pompes à double refoulement (10a, 10b). Lorsque, parmi la pluralité de pompes à double refoulement, il existe une pompe à double refoulement dont la pression d'évacuation détectée par les capteurs de pression dépasse une pression prescrite, un dispositif de commande (40) détermine que la pompe à double refoulement dont la pression d'évacuation dépasse une pression prescrite est une pompe à double refoulement en panne et ferme toutes les vannes sélectrices, parmi une pluralité de vannes sélectrices (11a, 11b, 12a, 12b), reliées à la pompe à double refoulement en panne.
PCT/JP2018/032747 2017-09-12 2018-09-04 Équipement de construction WO2019054234A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017174669A JP2019049335A (ja) 2017-09-12 2017-09-12 建設機械
JP2017-174669 2017-09-12

Publications (1)

Publication Number Publication Date
WO2019054234A1 true WO2019054234A1 (fr) 2019-03-21

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WO (1) WO2019054234A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113216314A (zh) * 2020-01-21 2021-08-06 卡特彼勒路面机械公司 液压箱保护系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7096178B2 (ja) * 2019-02-08 2022-07-05 日立建機株式会社 建設機械

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6317421U (fr) * 1986-07-16 1988-02-05
JP2008196403A (ja) * 2007-02-14 2008-08-28 Hitachi Sumitomo Heavy Industries Construction Crane Co Ltd 油圧ポンプの異常判別装置
JP2017115994A (ja) * 2015-12-24 2017-06-29 日立建機株式会社 作業機械

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6317421U (fr) * 1986-07-16 1988-02-05
JP2008196403A (ja) * 2007-02-14 2008-08-28 Hitachi Sumitomo Heavy Industries Construction Crane Co Ltd 油圧ポンプの異常判別装置
JP2017115994A (ja) * 2015-12-24 2017-06-29 日立建機株式会社 作業機械

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113216314A (zh) * 2020-01-21 2021-08-06 卡特彼勒路面机械公司 液压箱保护系统
CN113216314B (zh) * 2020-01-21 2023-11-03 卡特彼勒路面机械公司 液压箱保护系统

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