WO2024085269A1 - Machine de travail - Google Patents

Machine de travail Download PDF

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Publication number
WO2024085269A1
WO2024085269A1 PCT/KR2022/015854 KR2022015854W WO2024085269A1 WO 2024085269 A1 WO2024085269 A1 WO 2024085269A1 KR 2022015854 W KR2022015854 W KR 2022015854W WO 2024085269 A1 WO2024085269 A1 WO 2024085269A1
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WO
WIPO (PCT)
Prior art keywords
working fluid
control valve
quick coupler
flow control
flow
Prior art date
Application number
PCT/KR2022/015854
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English (en)
Korean (ko)
Inventor
손영진
이창훈
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
손영진
이창훈
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.)
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Application filed by 볼보 컨스트럭션 이큅먼트 에이비, 손영진, 이창훈 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2022/015854 priority Critical patent/WO2024085269A1/fr
Publication of WO2024085269A1 publication Critical patent/WO2024085269A1/fr

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    • 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
    • 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

Definitions

  • the present disclosure relates to a working machine, and more specifically to a working machine equipped with a quick coupler.
  • Work machines that perform work by obtaining power from high-pressure fluid pressure are known. Some of these work machines are equipped with quick couplers for easy attachment and detachment of work tools that perform work.
  • Figure 1 is a diagram schematically showing a conventional quick coupler.
  • the quick coupler 100 may include a quick coupler cylinder 130.
  • the first wedge 128 moves to the right based on the drawing and the second wedge 129 moves to the left based on the drawing to form the quick coupler 100.
  • the work tool fastening pin 125 of the work tool
  • the first wedge 128 moves to the left based on the drawing and the second wedge 129 moves to the right based on the drawing to create a quick coupler.
  • the coupler 100 is uncoupled with the work tool (fastening pin 125 of the work tool) (uncoupling position).
  • the quick coupler 100 may be provided with an elastic member 142 that applies elastic force to couple the quick coupler 100 and the work tool (the fastening pin 125 of the work tool).
  • the elastic member 142 is located within the cylinder of the quick coupler 100 and applies elastic force to the rod 135 and the wedge fixture 137.
  • Non-illustrated reference numeral 121 denotes the body of the quick coupler 100
  • 124 denotes a hook
  • 139 denotes a support block
  • 140 denotes a guide
  • 141 denotes a pin.
  • a working machine includes a tank, a working fluid pump configured to receive fluid from the tank and pressurize it to discharge the working fluid, a coupling position coupled to a work tool, and the operation
  • a quick coupler configured to receive a first working fluid from a fluid pump and have an uncoupling position to be uncoupled from the work tool by the pressure of the first working fluid, between the working fluid pump and the tank. positioned between a neutral position allowing flow of the second working fluid returned from the working fluid pump to the tank and a non-neutral position blocking the flow of the second working fluid returning from the working fluid pump to the tank.
  • a flow control valve that is switched and configured to control the flow rate of the flow of the second working fluid returned from the working fluid pump to the tank according to the amount of change from the neutral position to the non-neutral position; the work tool;
  • An input unit that receives the uncoupling command of the quick coupler, and while the uncoupling command input to the input unit is maintained, the flow control valve is switched to the non-neutral position, and then moves from the neutral position to the non-neutral position.
  • a control unit that controls the flow control valve so that the switching amount of the flow control valve to a position is greater than 0 but decreased.
  • shock occurs due to the hydraulic pressure used to uncouple the quick coupler and fine manipulation is difficult, making it difficult to position the quick coupler in the correct position corresponding to the work tool. It has the advantage of being able to solve difficult problems.
  • control unit moves from the neutral position when a preset time elapses after the uncoupling command is input to the input unit while the uncoupling command input to the input unit is maintained. Control the flow control valve so that the switching amount of the flow control valve to the non-neutral position is reduced from the first switching amount to the second switching amount, where the first switching amount > the second switching amount. .
  • the preset time may be equal to or greater than the time required for the quick coupler to switch to the uncoupling position.
  • the second switching amount may be equal to or greater than the minimum switching amount required to keep the quick coupler in the uncoupling position.
  • the quick coupler includes an elastic member that applies force to couple the quick coupler and the work tool, and when the flow control valve is switched to the second switching amount, the first 1
  • the force due to the pressure of the working fluid may be at least greater than the force due to the elastic member.
  • the outlet pressure of the working fluid pump when the flow control valve is switched to the first switching amount, the outlet pressure of the working fluid pump is, when the flow control valve is switched to the second switching amount, the working fluid pump may be greater than the outlet pressure of
  • it additionally includes a driving unit that drives the working fluid pump, and the control unit, according to a preset relationship in which the second switching amount decreases as the rotational speed of the driving unit increases, the driving unit
  • the flow control valve can be controlled so that the size of the second switching amount varies depending on the rotation speed.
  • the switching amount of the flow control valve from the neutral position to the non-neutral position is greater than 0 but decreases. It may include a signal generator that generates a signal to operate the flow control valve.
  • the present disclosure additionally includes a pilot pump, the signal is a hydraulic signal, the signal generator is located between the pilot pump and the flow control valve, and the flow control valve is supplied from the pilot pump. Switched between a first position blocking the flow of the pilot fluid to the pump and a second position allowing the flow of the pilot fluid from the pilot pump to the flow control valve, from the first position to the second position It may include an electronic proportional pressure reducing valve that generates the hydraulic signal by adjusting the pressure of the pilot fluid flowing to the flow control valve according to the switching amount.
  • the amount of change from the first position to the second position is determined by an electrical signal applied to the electronic proportional pressure reducing valve, and the uncoupling command input to the input unit is maintained.
  • the current value of the electrical signal may be configured to be greater than 0 but decrease.
  • the current value of the electrical signal is It is configured to decrease from the first current value to the second current value, where the first current value > the second current value.
  • the second current value may be equal to or greater than the minimum current value required to keep the quick coupler in the uncoupling position.
  • the quick coupler includes an elastic member that applies force so that the quick coupler and the work tool are coupled, and the second current value is adjusted according to the magnitude of the force by the elastic member. It may be acceptable to set the size.
  • it additionally includes a driving unit that drives the working fluid pump, and the control unit, according to a preset relationship in which the second current value decreases as the rotational speed of the driving unit increases, It may additionally include an electronic control unit that controls the electronic proportional pressure reducing valve so that the size of the second current value varies depending on the rotation speed of the driving unit.
  • the signal generator further includes a signal application valve located between the electromagnetic proportional pressure reducing valve and the flow control valve to allow or block the hydraulic signal from being applied to the flow control valve. can do.
  • the signal application valve may allow the hydraulic signal to be applied to the flow control valve.
  • the coupler is located between the working fluid pump and the quick coupler, has a first position, and allows the flow of the first working fluid from the working fluid pump to the quick coupler to form the quick coupler.
  • the coupler may additionally include a quick coupling valve having a second position that allows the coupler to be uncoupled from the work tool.
  • the quick coupling valve when the uncoupling command is input to the input unit, the quick coupling valve allows the flow of the first working fluid from the working fluid pump to the quick coupler to use the work tool. Can be uncoupled from the quick coupler.
  • the quick coupler includes a quick coupler cylinder, and when the uncoupling command is input to the input unit, the quick coupling valve connects the quick coupler cylinder from the working fluid pump to the quick coupler cylinder.
  • the quick coupler cylinder can be operated so that the work tool is uncoupled from the quick coupler by allowing the flow of the first working fluid.
  • It additionally includes a flow path connecting the working fluid pump and the flow control valve, a swing actuator control valve connected to the flow path, and a swing actuator, and the swing actuator control valve is connected to the swing actuator to operate the fluid from the working fluid pump.
  • the flow rate supplied to the swing actuator can be controlled.
  • Figure 1 is a diagram schematically showing an example of a conventional quick coupler.
  • FIG. 2 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • Figure 3 is a graph showing the switching amount of the flow control valve and the outlet pressure of the working fluid pump in a working machine according to a comparative example.
  • Figure 4 is a graph showing the switching amount of the flow control valve and the outlet pressure of the working fluid pump in the working machine according to an example of the present disclosure.
  • FIG. 5 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • FIG. 6 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • Figure 7 is a graph showing the current value applied to the electronic proportional pressure reducing valve, the switching amount of the flow control valve, and the outlet pressure of the working fluid pump in the working machine according to an example of the present disclosure.
  • FIG. 8 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • FIG. 9 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • Figure 10 is a graph showing the results of adjusting the current value input to the electronic proportional pressure reducing valve according to the rotation speed setting of the driving unit.
  • FIG. 2 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • the working machines of the present disclosure may include various machines that perform work by obtaining power from hydraulic pressure, such as heavy equipment, especially construction equipment such as excavators, but the present disclosure is not limited thereto.
  • the working machine may include a tank 200, a working fluid pump 330, a quick coupler 100, a flow control valve 430, an input unit 700, and a control unit 500.
  • the working fluid pump 330 may receive fluid from the tank 200 and pressurize it to discharge the working fluid.
  • the quick coupler 100 may have a known structure, for example, the structure shown in FIG. 1 .
  • the quick coupler 100 in FIG. 1 is merely for illustrative purposes and may have many different structures. It should be noted that the structure of FIG. 1 is merely a simple example rather than a typical or representative example of the quick coupler 100 of the working machine of the present disclosure. Since the quick coupler 100 of a known structure exists in many different structures, a detailed description of each of them will be omitted. However, those of ordinary skill in the art will be able to apply the quick coupler 100 of various structures to the work machine of the present disclosure without difficulty.
  • the quick coupler 100 may have a coupling position and an uncoupling position. When the quick coupler 100 is in the coupling position, the quick coupler 100 may be coupled with a work tool. The quick coupler 100 receives the first working fluid from the working fluid pump 330 and can be uncoupled from the work tool by the pressure of the first working fluid (uncoupling position).
  • the term 'working device' is used to refer to a combination of, for example, a boom, arm, and bucket of an excavator, and the term 'working tool' is used to refer to, for example, a bucket coupled to the quick coupler 100.
  • 'work tool' may be used to refer to devices such as breakers, shears, augers, and drills.
  • the quick coupler 100 is fixed to the end of the arm, and a bucket is coupled to the quick coupler 100.
  • the present disclosure is not limited thereto.
  • quick coupler 100 may include a quick coupler 100 cylinder, as shown in FIG. 1 .
  • Figure 1 shows an example in which fluid is supplied to the bottom chamber of the quick coupler cylinder for coupling, and fluid is supplied to the rod side chamber of the quick coupler cylinder for uncoupling.
  • this is only a simple example and is not included in the present disclosure. Please note that the content is not limited to these examples.
  • the quick coupler 100 may include an elastic member, such as a spring, that applies force to couple the quick coupler 100 and the work tool, as shown in FIG. 1 .
  • Figure 1 shows an example in which an elastic member is located in the cylinder of the quick coupler 100 to apply elastic force to the piston (rod 135 and wedge fixture 137 in Figure 1), but the present disclosure is not limited thereto. Rather, in many different quick coupler (100) structures, an elastic member is installed on the outside of the quick coupler (100) cylinder to apply elastic force to components other than the piston.
  • an elastic member is installed on the outside of the quick coupler (100) cylinder to apply elastic force to components other than the piston.
  • the structure of the quick coupler 100 in FIG. 1 is merely an example, and the present disclosure is not limited to this example.
  • the flow control valve 430 is located between the working fluid pump 330 and the tank 200.
  • the flow control valve 430 can be switched between a neutral position and a non-neutral position.
  • the flow control valve 430 controls the second working fluid discharged from the working fluid pump 330 and returned to the tank 200. flow can be allowed.
  • the flow control valve 430 may block the flow of the second working fluid discharged from the working fluid pump 330 and returned to the tank 200.
  • the flow control valve 430 may control the flow rate of the second working fluid returned from the working fluid pump 330 to the tank 200 according to the amount of change from the neutral position to the non-neutral position.
  • the input unit 700 receives an uncoupling command for the work tool and the quick coupler 100.
  • the input unit 700 may be an operator input unit that receives an uncoupling command from the driver, but the present disclosure is not limited thereto.
  • the uncoupling command may be a direct command, such as turning on a switch, or it may be an indirect command that is interpreted as an uncoupling command and ultimately causes uncoupling of the work tool and the quick coupler.
  • the working machine supplies the working fluid to the quick coupler 100 just by turning on the switch of the input unit 700, for example, without operating the RCV lever (not shown) to create pressure for uncoupling, thereby forming the quick coupler ( 100) can be uncoupled.
  • the control unit 500 switches the flow control valve 430 to the non-neutral position while the uncoupling command input to the input unit 700 is maintained, and then switches the flow control valve from the neutral position to the non-neutral position. Control the flow control valve so that the amount is greater than 0 but decreased. That is, the control unit 500 is an execution unit that executes the uncoupling command input to the input unit 700.
  • Figure 3 is a graph showing the switching amount of the flow control valve and the outlet pressure of the working fluid pump in a working machine according to a comparative example.
  • the switching amount of the flow control valve 430 from the neutral position to the non-neutral position is It can be configured to be greater than 0. If the switching amount from the neutral position to the non-neutral position is greater than 0, that is, when the flow control valve 430 is switched from the neutral position to the non-neutral position, the flow rate returned to the tank 200 decreases as the switching amount increases, As a result, the pressure of the fluid in the passage 910 between the working fluid pump 330 and the flow control valve 430 and the pressure of the fluid in the passage 920 between the working fluid pump 330 and the quick coupler 100 increase. I do it.
  • the quick coupler 100 can be operated from the coupling position to the uncoupling position by using the increased pressure of the fluid in the passage 920 between the working fluid pump 330 and the quick coupler 100.
  • the swing actuator control valve 410 (see FIG. 9) is switched to supply working fluid from the working fluid pump 330 to the swing actuator 411 (see FIG. 9).
  • the neutral position is maintained while the uncoupling command input to the input unit 700 is maintained. It may be configured to reduce the amount of switching of the flow control valve 430 from to the non-neutral position.
  • Figure 4 is a graph showing the switching amount of the flow control valve and the outlet pressure of the working fluid pump in the working machine according to an example of the present disclosure.
  • the switching amount from the neutral position to the non-neutral position may be configured to decrease from the first switching amount (S1) to the second switching amount (S2).
  • the preset time T1 may be equal to or greater than the time it takes for the quick coupler 100 to switch to the uncoupling position. Until the quick coupler (100) is switched to the uncoupling position, a large switching amount of S1 is given so that the quick coupler (100) can be quickly switched to the uncoupling position, for example, to quickly respond to the driver's uncoupling command. Once the quick coupler 100 is switched to the uncoupling position, the switching amount is reduced from S1 to S2 to prevent the occurrence of the shock described above.
  • the second switching amount S2 may be equal to or greater than the minimum switching amount required to keep the quick coupler 100 in the uncoupling position. This is because when the second switching amount (S2) becomes smaller than the minimum switching amount, the quick coupler 100 can be switched to the coupling position.
  • the force due to the pressure of the first working fluid applied to the quick coupler 100 is at least the quick coupler 100 and the work tool. It may be greater than the force caused by the elastic member that applies force to couple.
  • the flow control valve 430 is switched to the second switching amount (S2), if the force due to the pressure of the first working fluid is smaller than the force due to the elastic member, the quick coupler 100 is moved by the force due to the elastic member. This is because it can be switched to the coupling position.
  • the outlet pressure (P2) of the working fluid pump 330 is changed to the first switching amount (S1).
  • the outlet pressure (P1) of the working fluid pump 330 may be smaller than the outlet pressure (P1) of the working fluid pump 330.
  • FIG. 5 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • control unit 500 may include a signal generator 530.
  • the signal generator 530 generates a signal such that the switching amount of the flow control valve 430 from the neutral position to the non-neutral position is greater than 0 but decreased while the uncoupling command input to the input unit 700 is maintained.
  • the flow control valve 430 can be operated.
  • FIG. 6 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • the signal generated by the signal generator 530 may be a hydraulic signal.
  • the signal generator 530 may include an electronic proportional pressure reducing valve 531.
  • the electronic proportional pressure reducing valve 531 may be located between the pilot pump (see FIG. 9) and the flow control valve 430.
  • the electronic proportional pressure reducing valve 531 has a first position that blocks the flow of pilot fluid from the pilot pump to the flow control valve 430 and a second position that allows the flow of pilot fluid from the pilot pump to the flow control valve 430. can be switched between.
  • the electronic proportional pressure reducing valve 531 can generate a hydraulic signal by adjusting the pressure of the pilot fluid flowing to the flow control valve 430 according to the amount of change from the first position to the second position.
  • FIG. 7 is a graph showing the current value applied to the electronic proportional pressure reducing valve 531, the switching amount of the flow control valve 430, and the outlet pressure of the working fluid pump in a working machine according to an example of the present disclosure.
  • the amount of change from the first position to the second position may be determined by an electrical signal applied to the electronic proportional pressure reducing valve 531.
  • the current value of the electric signal may be greater than 0 while the uncoupling command (UC) input to the input unit 700 is maintained. Additionally, while the uncoupling command (UC) input to the input unit 700 is maintained, the current value of the electric signal may be configured to decrease.
  • the current of the electrical signal may be configured to decrease from the first current value (I1) to the second current value (I2).
  • the second current value I2 may be equal to or greater than the minimum current value required to keep the quick coupler 100 in the uncoupling position.
  • FIG. 8 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • the working machine may include a quick coupling valve 600 positioned between the working fluid pump 330 and the quick coupler 100.
  • the quick coupling valve 600 is in a first position and allows the flow of first working fluid from the working fluid pump 330 to the quick coupler 100 so that the quick coupler 100 is connected to the work tool. It may have a second position that causes uncoupling.
  • FIG. 9 is a diagram schematically showing a working machine according to an example of the present disclosure.
  • the signal generator 530 is located between the electronic proportional pressure reducing valve 531 and the flow control valve 430 and is a signal that allows or blocks the hydraulic signal to be applied to the flow control valve 430. It may include a valve 533.
  • the signal application valve 533 receives a signal according to the request and allows the hydraulic signal from the electronic proportional pressure reducing valve 531 to be applied to the flow control valve 430. can do.
  • the quick coupling valve 600 receives a signal according to the request and controls the flow of the first working fluid from the working fluid pump 330 to the quick coupler 100. By allowing, the work tool can be uncoupled from the quick coupler 100.
  • the input unit 700 may be connected to the signal application valve 533 and the quick coupling valve 600, respectively.
  • the flow control valve 430 may be a straight travel valve. In some examples, it may include a swing actuator control valve 410 connected to a flow path connecting the working fluid pump 330 and the flow control valve 430.
  • the swing actuator control valve 410 is connected to the swing actuator 411 and can control the flow rate supplied to the swing actuator 411 from the working fluid pump 330.
  • the quick coupler 100 may include a quick coupler cylinder 130 as shown in FIG. 1 . While the uncoupling command (UC) input to the input unit 700 is maintained, the quick coupling valve 600 allows the flow of the first working fluid from the working fluid pump 330 to the quick coupler cylinder 130. Thus, the quick coupler cylinder 130 can be operated so that the work tool is uncoupled from the quick coupler 100.
  • UC uncoupling command
  • the working machine may include a drive unit 350 that drives the working fluid pump 330.
  • the driving unit 350 is a power source that drives the pump and may include, for example, an engine or an electric motor.
  • the size of the second switching amount may be configured to vary depending on the rotational speed of the driving unit 350. Therefore, when the preset rotation speed of the driving unit is large, the flow control valve 430 can be switched to a small second switching amount.
  • the working machine may include an electronic control unit 540.
  • the electronic control unit 540 allows the size of the second current value to vary depending on the rotation speed of the drive unit 350 according to a preset relationship in which the second current value decreases as the rotation speed of the drive unit 350 increases.
  • the electronic proportional pressure reducing valve 531 can be controlled. Therefore, if the rotation speed of the preset driving unit is large, a small second current value may be given to the electronic proportional pressure reducing valve 531. This will be explained in more detail below.
  • the manipulation signal from the input unit 700 may be transmitted to the electronic control unit 540.
  • 9 shows an example in which the quick coupling valve 600 and the signal application valve 533 are operated according to the operation signal from the input unit 700, but in some other examples, the operation signal received from the input unit 700 is shown.
  • the quick coupling valve 600 and the signal application valve 533 may be operated according to the control signal from the electronic control unit 540.
  • the working fluid pump 330 and the quick coupling valve 600 are connected, and the driver sends an uncoupling request to the input unit.
  • the pressure of the fluid supplied from the pilot pump 340 switches the flow control valve 430, and accordingly, from the working fluid pump 330 through the inside of the main control valve 400 to the tank 200.
  • the fluid supplied from the working fluid pump 330 is supplied to the quick coupler cylinder 130 of the quick coupler 100 through the quick coupling valve 600, thereby forming the quick coupler cylinder 130.
  • an electronic proportional pressure reducing valve 531 is installed on the signal line between the pilot pump 340 and the flow control valve 430, and the electronic control unit 540 is connected to the electronic proportional pressure reducing valve 531.
  • the input current value is adjusted after a certain time (T1) to lower the secondary pressure of the electronic proportional pressure reducing valve 531, thereby reducing the amount of switching by which the flow control valve 430 is switched.
  • T1 a certain time
  • the fluid supplied from the working fluid pump 330 is not completely blocked by the flow control valve 430 of the main control valve 400, and some of the flow is bypassed to the tank 200 and some of the flow is transferred to the quick coupler. It is delivered to (100) and configured to lower the outlet pressure of the working fluid pump (330).
  • the P2 pressure that drops after a certain time (T1) is caused by the quick coupler cylinder ( 130) may be pushed again into a coupling state, so set the pressure to a level that prevents that from happening.
  • the drive unit 350 when the rotation speed of the drive unit 350 is low, the supply flow rate of the working fluid pump 330 is small, and when the rotation speed of the drive unit 350 is high, the supply flow rate of the working fluid pump 330 is large, so that the drive unit 350 If the P2 pressure is set based on when the rotation speed of the drive unit 350 is high, the flow rate is high and the P2 pressure becomes high, causing a sudden operation problem. If the P2 pressure is set as a standard, the P2 pressure may become too low when the rotational speed of the drive unit 350 is low, which may cause a problem in which the quick coupler 100 is switched back to the coupling position due to the elastic force of the elastic member.
  • Table 1 shows the variation of P2 pressure according to the rotation speed of the driving unit 350.
  • the secondary pressure from the electronic proportional pressure reducing valve 531 is adjusted by adjusting the current value input to the electronic proportional pressure reducing valve 531 according to the rotation speed of the driving unit 350.
  • the opening area of the flow control valve 430 can be adjusted by adjusting the switching amount of the flow control valve 430 accordingly.
  • the opening area of the flow control valve 430 is formed to cope with the increase in flow rate due to the increase in RPM of the drive unit 350, so that the change in P2 pressure depending on the setting of the rotation speed of the drive unit 350 is minimized.
  • the current value adjustment amount and results input to the electronic proportional pressure reducing valve 531 according to this technology are shown in Table 2 and FIG. 10 below.
  • I1(mA) 1400 RPM settings I2(mA) One 1000 2 1000 3 950 4 950 5 950 6 900 7 900 8 850 9 850 P1(kgf/ cm2 ) 280 RPM settings P2(kgf/ cm2 ) One 50 2 45 3 52 4 47 5 53 6 45 7 50 8 52 9 55
  • Figure 10 is a graph showing the results of adjusting the current value input to the electronic proportional pressure reducing valve 531 according to the rotation speed setting of the driving unit 350.
  • 'a' represents the second current value in Table 1 input to the electronic proportional pressure reducing valve 531
  • 'b' represents the adjusted second current value in Table 2 input to the electronic proportional pressure reducing valve 531
  • 'c' represents the P2 pressure in Table 1
  • 'd' represents the P2 pressure in Table 2.
  • the quick coupler (100) has many different types of products from each company, and these products are available from each company. In most cases, the elasticity of elastic members varies depending on their characteristics. Some companies' products are set low, and some companies' products are set high. In this way, even when applying various products from each company, in order to avoid the above-mentioned problem when operating the swing actuator 411, for example, after uncoupling of the quick coupler 100, the electronic control unit 540 is adjusted from the value set when the equipment is first shipped.
  • the current value of the electronic proportional pressure reducing valve (531) can be adjusted to, for example, 90% or 110% of the initial set value through the adjustment mode, allowing smooth operation without problems in other quick couplers (100) for each country/region and company. It can be set to enable. In some examples, it may be acceptable to set the magnitude of the second current value according to the magnitude of the force exerted by the elastic member.
  • the working fluid pump 330 and the quick coupler 100 connected to the straight travel valve among the three working fluid pumps 310, 320, and 330 shown in FIG. 9 are connected, but similarly, the main The quick coupler 100 is connected to the working fluid pumps 310 and 320 connected to other center bypass valves of the control valve 400, and the pressure is supplied to the quick coupler 100 when the input unit 700 is switched on. possible.
  • swing of the upper body of the excavator is necessary to change the work tool, but in addition or instead of this, for example, a lifting motion of the arm or boom of the excavator may be required. Therefore, the present disclosure can be applied to a structure in which the quick coupler 100 is connected to the working fluid pumps 310 and 320 connected to the arm actuator control valve or the boom actuator control valve.
  • Comparative terms such as “below,” “above,” “above,” “further below,” “horizontal,” or “vertical” are used herein to describe the relationship of any element shown in the figures to another element. You can. These terms and the foregoing may include other orientations of the device as well as the orientation shown in the figures. When an element is said to be connected or combined with another element, this may include not only a direct connection, but also other intervening elements. On the other hand, when an element is said to be directly connected or coupled to another element, this means that no intermediate elements exist.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
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  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Cette machine de travail peut comprendre : un réservoir ; une pompe de fluide de travail configurée pour recevoir un fluide en provenance du réservoir, mettre sous pression le fluide et évacuer le fluide de travail ; un coupleur rapide comprenant une position de couplage, au niveau de laquelle le coupleur rapide est couplé à un outil de travail, et une position de découplage, au niveau de laquelle le coupleur rapide reçoit un premier fluide de travail en provenance de la pompe de fluide de travail et est découplé d'un outil de travail en raison de la pression du premier fluide de travail ; une soupape de régulation de flux située entre la pompe de fluide de travail et le réservoir et configurée pour assurer une commutation entre une position neutre, au niveau de laquelle le flux d'un second fluide de travail revenant de la pompe de fluide de travail au réservoir est autorisé, et une position non neutre, au niveau de laquelle le flux du second fluide de travail revenant de la pompe de fluide de travail au réservoir est bloqué, et réguler le débit du second fluide de travail revenant de la pompe de fluide de travail au réservoir selon la quantité de commutation de la position neutre à la position non neutre ; une unité d'entrée qui reçoit une instruction pour découpler l'outil de travail et le coupleur rapide ; et une unité de commande qui commande la soupape de commande de flux tandis que l'instruction de découplage entrée dans l'unité d'entrée est maintenue, la soupape de commande de flux étant commandée de telle sorte que la quantité de commutation de la soupape de commande de flux de la position neutre à la position non neutre est réduite à une valeur supérieure à zéro après que la soupape de commande de flux est commutée vers la position non neutre.
PCT/KR2022/015854 2022-10-18 2022-10-18 Machine de travail WO2024085269A1 (fr)

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PCT/KR2022/015854 WO2024085269A1 (fr) 2022-10-18 2022-10-18 Machine de travail

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PCT/KR2022/015854 WO2024085269A1 (fr) 2022-10-18 2022-10-18 Machine de travail

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WO2024085269A1 true WO2024085269A1 (fr) 2024-04-25

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960695A (en) * 1997-04-25 1999-10-05 Caterpillar Inc. System and method for controlling an independent metering valve
JP2007327291A (ja) * 2006-06-09 2007-12-20 Takeuchi Seisakusho:Kk 作業機械
KR20100075300A (ko) * 2008-12-24 2010-07-02 두산인프라코어 주식회사 건설기계 유압펌프의 선택 유량 제어장치
KR20130075661A (ko) * 2011-12-27 2013-07-05 두산인프라코어 주식회사 건설기계의 유압시스템
KR20150117480A (ko) * 2014-04-10 2015-10-20 두산인프라코어 주식회사 굴삭기의 퀵 커플러 제어 방법 및 이를 수행하기 위한 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960695A (en) * 1997-04-25 1999-10-05 Caterpillar Inc. System and method for controlling an independent metering valve
JP2007327291A (ja) * 2006-06-09 2007-12-20 Takeuchi Seisakusho:Kk 作業機械
KR20100075300A (ko) * 2008-12-24 2010-07-02 두산인프라코어 주식회사 건설기계 유압펌프의 선택 유량 제어장치
KR20130075661A (ko) * 2011-12-27 2013-07-05 두산인프라코어 주식회사 건설기계의 유압시스템
KR20150117480A (ko) * 2014-04-10 2015-10-20 두산인프라코어 주식회사 굴삭기의 퀵 커플러 제어 방법 및 이를 수행하기 위한 장치

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