WO2021044526A1 - 多連バルブ装置およびその多連バルブ装置を備えた荷役装置 - Google Patents

多連バルブ装置およびその多連バルブ装置を備えた荷役装置 Download PDF

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Publication number
WO2021044526A1
WO2021044526A1 PCT/JP2019/034646 JP2019034646W WO2021044526A1 WO 2021044526 A1 WO2021044526 A1 WO 2021044526A1 JP 2019034646 W JP2019034646 W JP 2019034646W WO 2021044526 A1 WO2021044526 A1 WO 2021044526A1
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WO
WIPO (PCT)
Prior art keywords
line
pressure
valve device
pressure gauge
multiple valve
Prior art date
Application number
PCT/JP2019/034646
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English (en)
French (fr)
Japanese (ja)
Inventor
雅文 垣尾
Original Assignee
株式会社島津製作所
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 株式会社島津製作所 filed Critical 株式会社島津製作所
Priority to PCT/JP2019/034646 priority Critical patent/WO2021044526A1/ja
Priority to JP2021543846A priority patent/JP7248131B2/ja
Publication of WO2021044526A1 publication Critical patent/WO2021044526A1/ja

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering

Definitions

  • the present invention relates to a multiple valve device and a cargo handling device including the multiple valve device.
  • cargo handling devices such as forklifts that perform cargo handling work are equipped with multiple valve devices.
  • the multiple valve device used in the forklift is connected to the cylinder that operates the steering wheel and fork, and the multiple valve device switches the supply amount of the hydraulic fluid (hydraulic oil) to each device.
  • Cargo handling equipment is often used in factories and warehouses. Foreign matter such as metal powder and paper powder may be mixed in the working fluid of the multiple valve device. If the amount of foreign matter mixed in the hydraulic fluid of the multiple valve device increases, or if a large foreign substance is mixed in, an abnormality may occur in the multiple valve device and the cargo handling device may stop. Therefore, it is important to detect an abnormality in the multiple valve device at an early stage.
  • Patent Document 1 discloses a system for remotely detecting an abnormality in a vehicle. However, Patent Document 1 does not detect foreign matter mixed in the working fluid of the multiple valve device. In Patent Document 1, the cargo handling device may stop due to a foreign substance mixed in the working fluid of the multiple valve device.
  • An object of the present invention is to provide a multi-valve device capable of detecting foreign matter mixed in a working fluid and a cargo handling device including the multi-valve device.
  • the multiple valve device and the cargo handling device according to the present invention have the following configurations.
  • One aspect of the multiple valve device is a priority diversion valve that divides and discharges the hydraulic fluid into a preferential flow and a surplus flow, a first line through which the preferential flow flows, and a second line through which the surplus flow flows. And a throttle portion provided on at least one of the first line and the second line, and a first pressure gauge for measuring the pressure of the hydraulic fluid on the upstream side of the throttle portion in the first line and the second line. A control unit for determining whether foreign matter is mixed in the working fluid from the pressure value of the first pressure gauge is provided.
  • the pressure difference between the upstream and the downstream of the throttle portion becomes large, so that the foreign matter is contained in the hydraulic oil. I can judge. Unlike the conventional method, foreign matter in the hydraulic oil can be detected. Since the abnormality can be detected and resolved at an early stage, it is less likely that the cargo handling device will be stopped.
  • the priority diversion valve 12 and the directional control valves 14 and 16 are integrated.
  • a plurality of directional control valves 14 and 16 are provided, but the number of directional control valves 14 and 16 is not limited.
  • the directional control valves 14 and 16 supply and discharge the hydraulic fluid (hydraulic oil) to the lift cylinder LS and the tilt cylinder TS. And switch between stop and stop.
  • the number of directional control valves 14 and 16 may be changed, or the internal configuration of the directional control valves 14 and 16 may be changed.
  • the multiple valve device 10 measures the pressure on the upstream side of the throttle portion 20 in the priority flow valve 12, the first line L1, the second line L2, the first line L1, and the throttle portion 20 in the first line L1. It includes a first pressure gauge 22, a second pressure gauge 24 that measures the pressure on the downstream side of the throttle unit 20 in the first line L1, and a control unit 26 that determines an abnormality.
  • reference numeral P is a port serving as an introduction port for the hydraulic fluid (hydraulic oil) discharged from the pump
  • reference numeral T is a port serving as a discharge port to a tank for storing the hydraulic fluid.
  • the input side of the priority shunt valve 12 is connected to the port P, and the output side is connected to the first line L1 and the second line L2.
  • the hydraulic fluid sent from the pump is divided into a priority flow and a surplus flow by the priority distribution valve 12 and discharged.
  • the priority shunt valve 12 is combined with the steering valve at the bottom of the steering 28, and is usually in the state shown in FIG. 1 by an internal spring, and the priority flow port is connected to the first line L1. ..
  • the priority shunt valve 12 is in the state shown in FIG. 1, the priority flow port is connected to the first line L1, and the surplus flow port is connected to the second line L2.
  • the priority flow flows through the first line L1 and the surplus flow flows through the second line L2. If the levers LL and TL are operated without operating the steering 28, the state of the priority shunt valve 12 is switched from the state shown in FIG. 1, and the flow rate of the hydraulic fluid on the second line L2 increases. In this case, the flow rate of the working fluid flowing through the first line L1 is smaller than that in FIG.
  • the first line L1 is a flow path of the hydraulic fluid to the steering 28 of the forklift 18.
  • the first line L1 is connected to the port PF connected to the steering wheel 28.
  • the priority flow flows through the steering 28.
  • giving priority to the driving work leads to accident prevention.
  • the second line L2 is a flow path of the hydraulic fluid to the directional control valves 14 and 16.
  • the second line L2 is connected to the port T via the directional control valves 14 and 16.
  • the directional control valves 14 and 16 are valves for controlling the working device of the forklift 18, and include a directional control valve 14 for moving the fork NL up and down and a directional control valve 16 for changing the angle of the mast MT.
  • the directional control valves 14 and 16 are operated by the levers LL and TL of the forklift 18. When the lever LL is operated, the directional control valve 14 is operated.
  • the directional control valve 14 can control the flow to the port A1 connected to the lift cylinder LS.
  • the port X is not used, and the directional control valve 14 prevents the hydraulic fluid from flowing to the port X.
  • the directional control valve 16 is operated.
  • the directional control valve 16 can control the flow to the ports A2 and A3 connected to the tilt cylinder TS.
  • the hydraulic fluid is preferentially supplied to the first line L1 by the priority shunt valve 12, when the steering operation is performed, the hydraulic fluid is preferentially diverted from the total amount of the hydraulic fluid supplied to the priority shunt valve 12 to the second line L2.
  • the amount after deducting (surplus flow) flows. If the levers LL and TL are operated while the steering operation is stopped, the flow rate of the hydraulic fluid to the first line L1 is reduced, so that the flow rate of the hydraulic fluid to the second line L2 increases, and each cylinder LS, The movement of the TS becomes faster, and the movement of the fork NL and the mast MT becomes faster.
  • a throttle portion 20 is provided between the priority shunt valve 12 of the first line L1 and the port PF.
  • the throttle portion 20 reduces the flow rate of the working fluid.
  • a throttle valve is used for the throttle portion 20. By adjusting the opening and closing degree of the throttle valve, the flow rate of the hydraulic fluid is reduced. If no foreign matter is mixed in the working fluid, the pressure difference between the upstream and downstream of the throttle portion 20 falls within a certain range. When foreign matter enters the hydraulic fluid and is caught in the throttle portion 20, the pressure upstream of the throttle portion 20 increases and the pressure downstream of the throttle portion 20 decreases. If the pressure difference between the upstream and the downstream of the throttle portion 20 becomes larger than a certain range, it can be seen that foreign matter is caught in the throttle portion 20.
  • the throttle portion 20 is not limited to the throttle valve as long as the flow rate of the working fluid can be reduced.
  • the diameter of the first line L1 may be narrowed to form the throttle portion 20, or as shown in FIG. 4, a plate body 30 provided in the first line L1 may be narrowed in diameter to form the throttle portion 20. It may be 20.
  • the pressure of the hydraulic fluid upstream of the throttle portion 20 in the first line L1 is measured by the first pressure gauge 22.
  • the upstream of the throttle portion 20 is on the priority distribution valve 12 side of the throttle portion 20 in the first line L1.
  • the pressure of the working fluid downstream of the throttle portion 20 in the first line L1 is measured by the second pressure gauge 24.
  • the downstream side of the throttle portion 20 is on the port PF side of the throttle portion 20 in the first line L1.
  • the first pressure gauge 22 and the second pressure gauge 24 can use a Bourdon tube pressure gauge, a diaphragm type pressure gauge, or the like, but the first pressure gauge 22 and the second pressure gauge 24 are not particularly limited as long as the pressure of the hydraulic oil can be measured.
  • Control unit The pressure value of the first pressure gauge 22 and the pressure value of the second pressure gauge 24 are input to the control unit 26, and the control unit 26 determines that foreign matter is mixed in the working fluid using these pressure values.
  • the control unit 26 uses a small computer such as an IC.
  • the computer mounted on the forklift 18 may be used as the control unit 26.
  • the control unit 26 takes the difference between the pressure values measured by the first pressure gauge 22 and the second pressure gauge 24, and if the difference is within the above-mentioned certain range, there is no abnormality in the working fluid, and if the difference exceeds the certain range, the working fluid is normal. It is judged that there is an abnormality (mixture of foreign matter) in.
  • control unit 26 determines that there is an abnormality in the hydraulic oil, it is preferable to display it at an arbitrary place on the forklift 18 or output a voice. Notify the operator of the forklift 18 of the abnormality.
  • a third line L3 is provided in parallel with the second line L2.
  • the third line L3 is connected to the first line L1 and the second line L2 via pressure control valves 32 and 34.
  • the pressure control valves 32 and 34 are opened and the hydraulic fluid is flowed to the third line L3.
  • the pressure of the working fluids of the first line L1 and the second line L2 falls below a certain value.
  • a throttle valve 36 may be provided between the priority shunt valve 12 and the pressure control valve 32 to adjust the flow rate of the hydraulic fluid to the pressure control valve 32.
  • the priority flow valve 12 causes the priority flow of the hydraulic fluid to flow to the first line L1 and the excess flow to the second line L2.
  • the pressure of the hydraulic fluid upstream of the throttle portion 20 is measured by the first pressure gauge 22, and the pressure of the hydraulic fluid downstream of the throttle portion 20 is measured by the second pressure gauge 24. If the difference between the measured pressure values is within a certain range, the control unit 26 determines that no foreign matter is mixed in the multiple valve device 10. If the difference between the measured pressure values becomes larger than a certain range, the control unit 26 determines that foreign matter is mixed in the multiple valve device 10. Replace the hydraulic fluid at an early stage so that the forklift 18 does not stop abnormally.
  • the throttle portion 20 in the first line L1 in which the hydraulic fluid is preferentially flowing, the pressure difference between the upstream and the downstream of the throttle portion 20 is increased when a foreign substance is caught in the throttle portion 20. It can be determined that foreign matter is contained in the hydraulic oil by using the increase in size. Unlike the conventional method, foreign matter in the hydraulic oil can be detected. Since the abnormality can be detected and resolved at an early stage, the forklift 18 is less likely to be stopped. The throttle portion 20 does not stop the flow of the hydraulic fluid to the steering 28 and does not affect the steering operation.
  • the throttle portion 20, the first pressure gauge 22, and the second pressure gauge 24 may be provided on the second line L2.
  • a throttle portion 20 is provided between the priority diversion valve 12 and the directional control valve 14 in the second line L2.
  • the first pressure gauge 22 measures the pressure of the hydraulic fluid upstream of the throttle portion 20 in the second line L2
  • the second pressure gauge 24 measures the pressure of the hydraulic fluid downstream of the throttle portion 20 in the second line L2.
  • the control unit 26 determines an abnormality by using the difference between the pressure values measured by the first pressure gauge 22 and the second pressure gauge 24 as in the above embodiment.
  • throttle portions 20 are provided in both the first line L1 and the second line L2, and the pressures of the hydraulic oils upstream and downstream of each are the pressure gauges 22 and the second. It may be measured by the pressure gauge 24. An abnormality is determined by using the pressure difference between the upstream and downstream of the throttle portion 20 of each line L1 and L2. Since the number of diaphragms 20 is increased, it is easy to detect an abnormality.
  • the control unit 26 obtains information on the steering wheel 28 from the steering control device 72 that controls the steering wheel 28.
  • the information on the steering 28 includes the angle of the steering 28.
  • the pressure of the hydraulic fluid downstream of the throttle portion 20 can be known from the angle of the steering 28.
  • the control unit 26 stores the pressure downstream of the throttle unit 20 according to the angle of the steering 28 in a storage unit (not shown).
  • the control unit 26 determines an abnormality by taking the difference between the pressure obtained from the first pressure gauge 22 and the pressure according to the angle of the steering wheel 28.
  • the multi-valve device 80 provided with the communication unit 82 may be used.
  • the pressure value acquired by the control unit 26 is transmitted to the host computer 86 via the network 84.
  • Examples of the communication unit 82 include a device capable of performing mobile communication via the network 84, a device for wireless communication such as WiFi, and the like.
  • the measured value is transmitted by the communication unit 82 and stored in the storage means of the host computer 86.
  • the host computer 86 may determine the abnormality performed by the control unit 26.
  • the result determined by the host computer 86 may be displayed by the forklift 18 used by the operator via the network 84.
  • the multiple valve devices 50, 60, and 70 of FIGS. 5 to 7 may also have a configuration in which the communication unit 82, the network 84, and the host computer 86 are provided as in FIG.
  • the multiple valve device may be variously changed depending on the configuration of the forklift 18, and is not limited to the multiple valve device of the above-described embodiment.
  • the number of directional control valves 14 and 16 may be three or more.
  • a directional control valve for supplying the hydraulic fluid to the cylinder is added.
  • the cargo handling device is not limited to the forklift 18 as long as the multiple valve device described above is used.
  • a priority diversion valve that divides and discharges the hydraulic fluid into a priority flow and a surplus flow, a first line through which the priority flow flows, and a second line through which the surplus flow flows.
  • a throttle portion provided on at least one of the first line and the second line, and a first pressure gauge for measuring the pressure of the hydraulic fluid on the upstream side of the throttle portion in the first line and the second line.
  • a control unit for determining whether foreign matter is mixed in the working fluid from the pressure value of the first pressure gauge is provided.
  • the pressure value of the first pressure gauge rises due to foreign matter being caught in the throttle portion, and the control unit can determine an abnormality. It is possible to determine an abnormality in the hydraulic circuit, which was not possible in the past, and prevent the cargo handling device from stopping.
  • a second pressure gauge for measuring the pressure of the hydraulic fluid on the downstream side of the throttle portion is provided, and the control unit has a pressure value of the first pressure gauge and a second. Judge that foreign matter is mixed in the working fluid from the pressure value of the pressure gauge.
  • an abnormality can be determined by utilizing the fact that the pressure difference between the hydraulic fluid upstream and downstream of the throttle portion becomes large due to foreign matter being caught in the throttle portion.
  • the difference in pressure value gradually increases.
  • the continuous valve device can be repaired.
  • the cargo handling device of the present application includes the multiple valve device described in paragraphs 1 to 3.
  • the stop of the multiple valve device can be prevented, so that the stop of the cargo handling device can be prevented.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)
PCT/JP2019/034646 2019-09-03 2019-09-03 多連バルブ装置およびその多連バルブ装置を備えた荷役装置 WO2021044526A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2019/034646 WO2021044526A1 (ja) 2019-09-03 2019-09-03 多連バルブ装置およびその多連バルブ装置を備えた荷役装置
JP2021543846A JP7248131B2 (ja) 2019-09-03 2019-09-03 多連バルブ装置およびその多連バルブ装置を備えた荷役装置

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Application Number Priority Date Filing Date Title
PCT/JP2019/034646 WO2021044526A1 (ja) 2019-09-03 2019-09-03 多連バルブ装置およびその多連バルブ装置を備えた荷役装置

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PCT/JP2019/034646 WO2021044526A1 (ja) 2019-09-03 2019-09-03 多連バルブ装置およびその多連バルブ装置を備えた荷役装置

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WO (1) WO2021044526A1 (enrdf_load_stackoverflow)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62105318U (enrdf_load_stackoverflow) * 1985-12-23 1987-07-04
JPH02227110A (ja) * 1989-02-28 1990-09-10 Komatsu Ltd 油圧回路汚染度表示装置
JPH0651508U (ja) * 1991-11-18 1994-07-15 株式会社新潟鉄工所 フィルタの目詰り警報装置
JP2003095121A (ja) * 2001-09-25 2003-04-03 Kayaba Ind Co Ltd 車両用油圧制御装置
JP2003130012A (ja) * 2001-10-26 2003-05-08 Shimadzu Corp 液圧制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62105318U (enrdf_load_stackoverflow) * 1985-12-23 1987-07-04
JPH02227110A (ja) * 1989-02-28 1990-09-10 Komatsu Ltd 油圧回路汚染度表示装置
JPH0651508U (ja) * 1991-11-18 1994-07-15 株式会社新潟鉄工所 フィルタの目詰り警報装置
JP2003095121A (ja) * 2001-09-25 2003-04-03 Kayaba Ind Co Ltd 車両用油圧制御装置
JP2003130012A (ja) * 2001-10-26 2003-05-08 Shimadzu Corp 液圧制御装置

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JP7248131B2 (ja) 2023-03-29
JPWO2021044526A1 (enrdf_load_stackoverflow) 2021-03-11

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