CN115013373A - Hydraulic system control device for construction machine, construction machine provided with same, and method for same - Google Patents

Hydraulic system control device for construction machine, construction machine provided with same, and method for same Download PDF

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Publication number
CN115013373A
CN115013373A CN202210218219.3A CN202210218219A CN115013373A CN 115013373 A CN115013373 A CN 115013373A CN 202210218219 A CN202210218219 A CN 202210218219A CN 115013373 A CN115013373 A CN 115013373A
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CN
China
Prior art keywords
parking brake
hydraulic system
system control
working machine
hydraulic
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202210218219.3A
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Chinese (zh)
Inventor
金泰润
金基成
韩相勋
崔智皓
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Hyundai Doosan Yingweigao Co ltd
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Hyundai Doosan Yingweigao Co ltd
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Filing date
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Application filed by Hyundai Doosan Yingweigao Co ltd filed Critical Hyundai Doosan Yingweigao Co ltd
Publication of CN115013373A publication Critical patent/CN115013373A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/04—Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
    • E02F5/32—Rippers
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • 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
    • E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
    • F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F16H63/3416—Parking lock mechanisms or brakes in the transmission
    • F16H63/3483—Parking lock mechanisms or brakes in the transmission with hydraulic actuating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The present invention relates to a hydraulic system control device for a construction machine including a travel motor driven by hydraulic pressure supplied from a hydraulic pump and a parking brake for fixing the travel motor, the hydraulic system control device for a construction machine may include: a valve portion that supplies a release hydraulic pressure for releasing operation of the parking brake; and a control portion that controls opening/closing of the valve portion, the control portion being capable of controlling the valve portion so as to supply the release hydraulic pressure to the parking brake when operation of the working machine is sensed in a state where travel operation of the working machine is stopped.

Description

Hydraulic system control device for construction machine, construction machine provided with same, and method for same
Technical Field
The present invention relates to a hydraulic system control device for a construction machine, a construction machine including the same, and a method thereof.
Background
A construction machine such as an excavator is provided with a drive system for driving a vehicle, and the drive system includes a hydraulic pump for generating pressure oil using a diesel engine or a gasoline engine as a drive source, a hydraulic control valve for controlling the movement direction and flow rate of the pressure oil, a hydraulic actuator for performing a machine operation, and the like.
The drive system is provided with a running device for running the vehicle. The traveling device includes a traveling motor that generates a rotational force by pressure oil of a hydraulic pump, a traveling reducer that is connected to an output shaft of the traveling motor and reduces the rotational force of the traveling motor to a state suitable for traveling, and the like.
The travel motor has a function of preventing the excavator from being dragged by an external force (working force) in a longitudinal direction (longitudinal direction of the excavator) during an operation such as excavation, in addition to a travel function. In order to prevent the excavator from being dragged by an external force, a Parking Brake (Parking Brake) is provided inside the travel motor.
Disclosure of Invention
The present invention relates to a hydraulic system control device for a construction machine for preventing a load from accumulating in a travel reducer during heavy load work, a construction machine provided with the same, and a method thereof.
According to various embodiments of the present invention, a hydraulic system control apparatus for a construction machine including a travel motor driven by hydraulic pressure supplied from a hydraulic pump and a parking brake for fixing the travel motor may include: a valve portion that supplies a release hydraulic pressure for releasing operation of the parking brake; and a control portion that controls opening/closing of the valve portion, the control portion being capable of controlling the valve portion so as to supply the release hydraulic pressure to the parking brake when operation of the working machine is sensed in a state where travel operation of the working machine is stopped.
Preferably, a first release pressure supply flow path may be included that supplies hydraulic pressure to the parking brake in the work machine traveling state.
Preferably, a second release pressure supply flow path may be included that supplies hydraulic pressure to the parking brake in a stop-running state of the construction machine.
Preferably, the valve portion may include a traveling two-speed switching valve for shifting the rotation speed of the traveling motor to one speed or two speeds.
Preferably, the work machine may include a ripper.
Preferably, the first release pressure supply flow path may communicate with a drain flow path in a state where the construction machine stops running.
Preferably, the work machine may include a sensor unit including a first sensor for sensing an operation of the work machine and a second sensor for sensing a travel operation; the control portion may control opening/closing of the valve portion according to a sensing result of the sensor portion.
According to various embodiments of the present invention, a hydraulic system control method for a construction machine, in which a parking brake is operated to fix a travel motor when the construction machine is in a stopped travel state, may include: confirming whether the operation of the working machine and the running operation exist or not; and a step of supplying hydraulic pressure for releasing the operation of the parking brake if the operation of the working machine is sensed in a state where the working machine is in a stop operation.
Preferably, the work machine may include a ripper.
Preferably, it may include: and operating a hydraulic brake for stopping the work machine if the parking brake is released in a state where the work machine is in a stop operation.
The construction machine according to various embodiments of the present invention may include: a frame; a travel motor housing provided at one side of the frame; a discharge hose connected to one side of the travel motor housing; a second release pressure supply hose connected to the travel motor housing to supply a release hydraulic pressure to a parking brake; and a pressure oil removal hose provided so as to communicate a two-speed control valve with the discharge hose, wherein the two-speed control valve is disposed inside the travel motor casing.
Effects of the invention
The hydraulic system control apparatus and method of a construction machine according to various embodiments of the present invention may prevent an excessive load from being transmitted to a travel retarder by providing an additional release pressure supply path that can supply pressure for releasing operation to a parking brake when a working machine such as a ripper is used while traveling is stopped.
In addition, by using the traveling two-speed switching valve as a control member for controlling the supply of the release pressure, it is possible to improve the efficiency in manufacturing or operation.
Drawings
Fig. 1 is a hydraulic circuit diagram of a hydraulic system control device for a construction machine according to the related art.
Fig. 2 is a hydraulic circuit diagram of a hydraulic system control apparatus of a construction machine according to various embodiments of the present invention.
Fig. 3 is a block diagram of a hydraulic system control apparatus of a construction machine according to various embodiments of the present invention.
Fig. 4 is a diagram showing a construction machine to which a hydraulic system control device according to various embodiments of the present invention is applied.
Fig. 5 is a sequence diagram illustrating a hydraulic system control method of a working machine according to the present invention.
Description of the symbols
101: travel motor, 110: valve section, 115: second relief pressure supply flow path, 120: balanced valve, 125: first relief pressure supply flow path, 130: sensor portion, 131: first sensor, 132: second sensor, 140: control unit, 150: parking brake, 180: two-speed control valve, 185: a discharge flow path.
Detailed Description
Some embodiments of the invention are illustrated below by way of example for ease of explanation. In the description of the reference numerals for the components of the respective drawings, the same components are denoted by the same reference numerals as much as possible even when they are displayed on different drawings.
The terms or words used in the present specification and claims are not limited to the ordinary meaning or dictionary meaning, and should be interpreted as the meaning and concept conforming to the technical idea of the present invention based on the principle that "the inventor can appropriately define the concept of the terms in order to explain his own invention in the best way". In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), and the like may be used. Such terms are used only to distinguish one constituent element from another constituent element, and the nature, order, sequence, or the like of the respective constituent elements is not limited by the terms. When it is stated that a certain component is "connected" or "coupled" to another component, it is understood that: the component may be directly connected or coupled to the other component, but other components may be further "connected" or "coupled" between each component and the other component.
Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferable embodiments of the present invention, and do not fully represent the technical ideas of the present invention, and it is understood that various equivalents and modifications may be substituted for them at the time of the present application. In addition, well-known functions or constructions that may unnecessarily obscure the gist of the present invention are not described in detail.
A working machine such as a bucket or a ripper for performing various operations is connected to the front of the working machine. When excavating a hard ground such as a rock formation, an excavating force of 2 to 2.5 times or more is required as compared with excavating a ground made of silt, and particularly in countries such as china where blasting using explosives is prohibited, special equipment called rippers (rippers) is used to break the ground.
Fig. 1 is a hydraulic circuit diagram of a hydraulic system control device for a construction machine according to the related art. Referring to fig. 1, according to the conventional art, when the ripper is operated, the driving motor 1 is controlled to be fixed by the parking brake 50. Specifically, in a state where the construction machine stops running, the balance valve 20 is controlled to a neutral state without generating a hydraulic pressure, and in the neutral state, the release pressure supply line 5 that supplies the release hydraulic pressure to the parking brake 50 communicates with the drain line 85 so that the hydraulic pressure is not generated in the parking brake. Thus, the travel motor is elastically pressurized and fixed by a friction disc (not shown) of the parking brake 50.
In addition, conventionally, when the construction machine stops traveling, even when the front end working machine including the ripper is operated or the swing operation is performed, the parking brake 50 is not applied with the release pressure and the traveling motor is fixed by the parking brake as described above.
However, when the ground is scraped with the ripper, the travel motor is locked by the parking brake, and thus the corresponding load is directly transmitted to the travel reducer. In particular, in equipment of 80 tons or more, a high load due to the use of the ripper is transmitted to the motor side, and the running reduction gear is damaged due to accumulation of fatigue.
Accordingly, the present invention has been made in an effort to prevent a load from being accumulated in a travel reducer in a heavy load work such as a ripper work, and has been made to propose a hydraulic system control apparatus for a construction machine and a method thereof, which controls so as to release a parking brake in a ripper work.
The hydraulic system control device and method for construction machinery according to the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 is a hydraulic circuit diagram of a hydraulic system control apparatus of a construction machine according to various embodiments of the present invention, and fig. 3 is a block diagram of a hydraulic system control apparatus of a construction machine according to various embodiments of the present invention.
Referring to fig. 2 and 3, a hydraulic system control apparatus for a construction machine according to various embodiments of the present disclosure for controlling a hydraulic system of the construction machine may include a sensor portion 130, a valve portion 110, and a control portion 140, wherein the construction machine includes: a travel motor 101, the travel motor 101 being driven by hydraulic pressure supplied from a hydraulic pump; a speed reduction unit that transmits the driving force of the travel motor 101 to a travel unit; and a parking brake 150, wherein the parking brake 150 fixes the running motor 101.
The sensor part 130 may include: a first sensor 131, the first sensor 131 sensing operation of a work machine such as a ripper; a second sensor 132, the second sensor 132 sensing a travel operation of the construction machine. In addition, the sensor part 130 may further include a third sensor (not shown) sensing a swing motion.
In an embodiment, the first to third sensors may include pressure sensors that sense respective pilot pressures required for the operations. In the present invention, the control unit 140 may determine whether the construction machine is operated by the working machine, the swing operation, the travel operation, or the like, using the first to third sensors.
In an embodiment, the first sensor 131 may be provided on a hydraulic line supplying pressure oil required for a work and detect a work load (torque), or sense an electronic control signal generated when a joystick (not shown) is operated or a pilot hydraulic pressure applied when the joystick (not shown) is operated to sense the presence or absence of a work machine operation.
The sensed value of the work machine operation sensed by the first sensor 131 is supplied to the control portion, and the control portion may determine that the work machine operation is present when the received sensed value is equal to or greater than a preset value.
In an embodiment, the second sensor 132 may be provided on a hydraulic line supplying pressure oil required for traveling and detect a traveling load, or sense an electronic control signal generated when a joystick (not shown) is operated or a pilot hydraulic pressure applied when the joystick (not shown) is operated to sense the presence or absence of a traveling operation.
The sensed value of the running operation sensed by the second sensor 132 is supplied to the control portion, and the control portion may determine that the running operation is performed when the received sensed value is equal to or greater than a preset value.
In addition, the third sensor (not shown) may also sense the swing motion of the construction machine by the above-described method, and the sensed signal value may be supplied to the control part.
The control part 140 may receive the sensing result from the sensor part 130 and determine whether to release the parking brake 150 based thereon. The control part 140 may control the valve part 110, which will be described later, to supply the release hydraulic pressure to the parking brake 150 according to the sensing results of the first to third sensors.
In one embodiment, if the control unit 140 determines that the work machine is operated while the work machine is in the travel-stopped state, it may control the parking brake 150 to be supplied with the release hydraulic pressure to release the parking brake 150 from fixing the travel motor 101.
When the construction machine is in a running state, the balance valve 120 is switched to supply the release hydraulic pressure to the first release pressure supply passage 125 that supplies the release hydraulic pressure to the parking brake 150, and thus the brake is released. However, in the stopped state of the construction machine, the second release pressure supply passage 115 communicates with the drain passage 185 as described above, so that the release hydraulic pressure is not supplied and the brake is in the braking state.
Even in the stopped state, if the control unit of the present invention determines that the operation of the working machine for starting the working machine such as the ripper is performed, the control valve unit 110 is turned on (on) to control the supply of the cancellation hydraulic pressure to the parking brake 150. For this, according to various embodiments of the present invention, a second release pressure supply flow path 115 may be formed, the second release pressure supply flow path 115 being formed separately from the first release pressure supply flow path 125, and may supply a release hydraulic pressure to the parking brake 150. The second release pressure supply flow passage 115 may be formed to connect the valve portion 110 and the parking brake 150. In an embodiment, the second release pressure supply flow path 115 may be formed in a manner of merging to one side of the first release pressure supply flow path 125, but is not limited thereto, and the second release pressure supply flow path 115 may be provided to be connected to the parking brake 150 independently of the first release pressure supply flow path 125. On the other hand, a check valve 117 may be disposed in a portion where the second release pressure supply flow path 115 is connected to the first release pressure supply flow path 125.
On the other hand, at least one orifice 127 may be disposed in the first canceling pressure supply passage 125 at a position closer to the balancing valve 120 than the portion where the second canceling pressure supply passage 115 is connected. By disposing such an orifice 127, the hydraulic pressure flowing in from the second release pressure supply flow passage 115 can be supplied to the parking brake 150 side. The hydraulic pressure flowing from the second release pressure supply flow path 115 may be greater than the hydraulic pressure required to release the parking brake 150. In the exemplary embodiment, the hydraulic pressure supplied through second release pressure supply flow path 115 is approximately 40bar or so, and the hydraulic pressure required to release the parking brake is approximately 18bar or so. Therefore, since the orifice 127 is disposed in the first release pressure supply passage, a sufficient hydraulic pressure required to release the parking brake 150 can be supplied through the second release pressure supply passage 115 even in a state where the first release pressure supply passage 125 communicates with the drain passage 180 in the stopped state.
The valve portion 110 is on/off (on/off) controlled by the control portion 140, and at the time of the on (on) control, a releasing hydraulic pressure can be supplied to the parking brake 150 through the second releasing pressure supply flow path 115. In one embodiment, the valve portion 110 may be a traveling two-speed switching valve for shifting the rotation speed of the traveling motor 101 to one speed or two speeds. In the present invention, the pilot pressure supplied when the original traveling two-speed switching valve is switched can be used as the release hydraulic pressure of the parking brake 150 without providing a separate valve member.
In this case, however, the second-speed control valve 180 may be provided to communicate with the drain path 185 through the pressure oil removal path 181, wherein the second-speed control valve 180 receives pilot pressure supply from an existing traveling second-speed switching valve and controls the second-speed control cylinder in order to control the swash plate inclination angle of the traveling motor 101.
That is, according to various embodiments of the present invention, even when the working machine such as a ripper is operated in a high load state while the working machine is in a stopped state, the control unit 140 supplies the parking brake 150 with the release hydraulic pressure through the second release pressure supply passage 115 provided separately from the first release pressure supply passage 125, and thus can release the fixation of the travel motor 101.
Fig. 4 is a diagram showing a construction machine to which a hydraulic system control device according to various embodiments of the present invention is applied. Referring to fig. 4, a travel motor housing 201 may be provided at one side of a frame 10 of a construction machine, and working oil hoses H1, H2 may be connected to one side of the travel motor housing 201 so that working oil P1, P2 flows into the balance valve 120.
A second release pressure supply hose 215 forming the second release pressure supply flow path 115 may be connected to the travel motor housing 201 through a check valve 117. In addition, a drain hose 285 is connected to one side of the traveling motor case 201, wherein the drain hose 285 forms a drain flow path 185, and in this case, a pressure oil removing hose 281 may be disposed on the traveling motor case 201 side so as to communicate the second-speed control valve 180 with the drain hose 285, wherein the pressure oil removing hose 281 forms a pressure oil removing flow path 181 for removing pressure oil inside the second-speed control valve 180.
Fig. 5 is a sequence diagram illustrating a hydraulic system control method of a working machine according to the present invention. Referring to fig. 5, in a hydraulic system control method of a construction machine according to various embodiments of the present disclosure, the hydraulic system control method of a construction machine may include: a step (S310) for confirming whether the operation of the working machine and the operation of the traveling are performed; and a step (S320) of supplying a hydraulic pressure for releasing the operation of the parking brake 150 if an operation of the working machine is sensed in a state where the working machine is in a stop operation.
In one embodiment, the control method according to the present invention may be executed only when the operator selects the ripper option to use in the work machine, and may further include, before the step of determining whether the work machine and the travel operation are present: and a step (S301) of confirming whether the option of using the ripper is selected.
In the method for controlling a hydraulic system of a construction machine, in step S310 for confirming the presence or absence of a work machine operation and the presence or absence of a travel operation, the control unit 140 may first determine whether or not a travel stop operation is present based on the sensing result of the sensor unit 130, and when the travel stop operation is present, determine whether or not an operation of a work machine such as a ripper or a turning operation is present.
If the operation or the swing operation of the working machine is performed in the state where the traveling operation is stopped, the control unit 140 supplies a pressure for releasing the operation of the parking brake 150 in step S320 in order to prevent an excessive load from being applied to the decelerator due to the fixation of the traveling motor 101. Specifically, in the step S320, the control portion 140 controls the valve portion 110 to be opened, and supplies the hydraulic pressure to the parking brake 150 through the second release pressure supply flow path 115, thereby releasing the fixation of the travel motor 101.
In addition, in the present invention, the method may further include: and a step (S330) of activating the hydraulic brake to stop the travel of the construction machine when the parking brake 150 provided in the travel motor 101 is released to cut off the overload transmitted to the retarder.
As described above, according to various embodiments of the present invention, it is possible to prevent an excessive load from being transmitted to the travel retarder by providing an additional release pressure supply flow path that can supply pressure for release operation to the parking brake 150 when the work machine such as a ripper is used while traveling is stopped. In addition, by using the traveling two-speed switching valve as a control member for controlling the supply release pressure, it is possible to improve the efficiency in manufacturing or operation.
The above description is made of a case where all the constituent elements constituting the embodiment of the present invention are combined into one or combined and operated, but the present invention is not necessarily limited to such an embodiment. That is, all of these components may be selectively combined to operate at least one of them as long as they are within the object of the present invention. In addition, the terms "including", "constituting" or "having" described above mean that the corresponding constituent elements may be included unless otherwise specified, and therefore, it should be construed that other constituent elements are not excluded and may be included. All terms including technical terms or scientific terms, if not defined differently, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms generally used as terms defined in dictionaries should be interpreted as having a meaning consistent with the meaning of the context of the related art, and should not be interpreted in an excessive or excessive manner as a formal meaning unless explicitly defined in the present invention.
The above description is merely an exemplary description of the technical idea of the present invention, and various modifications and variations can be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to be limiting but to describe the technical idea of the present invention, and the scope of the technical idea of the present invention is not intended to be limited by such embodiments. The scope of the present invention should be construed in accordance with the accompanying claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the claims.

Claims (11)

1. A hydraulic system control device for a construction machine including a travel motor driven by hydraulic pressure supplied from a hydraulic pump and a parking brake for fixing the travel motor, the hydraulic system control device comprising:
a valve portion that supplies a release hydraulic pressure for releasing operation of the parking brake; and
a control portion that controls opening/closing of the valve portion,
the control portion controls the valve portion so as to supply the release hydraulic pressure to the parking brake when an operation of the working machine is sensed in a state where the working machine stops traveling.
2. The hydraulic system control apparatus for a working machine according to claim 1,
a first release pressure supply flow path is included that supplies hydraulic pressure to the parking brake in the work machine traveling state.
3. The hydraulic system control apparatus for a working machine according to claim 1,
a second release pressure supply flow path that supplies hydraulic pressure to the parking brake in a state where the construction machine stops traveling is included.
4. The hydraulic system control apparatus for a working machine according to claim 1,
the valve portion includes a traveling two-speed switching valve for shifting the rotation speed of the traveling motor to one speed or two speeds.
5. The hydraulic system control apparatus for a working machine according to claim 1,
the work machine includes a ripper.
6. The hydraulic system control apparatus of a working machine according to claim 2,
the first relief pressure supply flow path communicates with a drain flow path in a stop running state of the construction machine.
7. The hydraulic system control apparatus for a working machine according to claim 1,
includes a sensor unit including a first sensor for sensing an operation of the work machine and a second sensor for sensing a travel operation,
the control portion controls opening/closing of the valve portion according to a sensing result of the sensor portion.
8. A method for controlling a hydraulic system of a construction machine, in which a parking brake is operated to fix a travel motor when a travel state is stopped, the method comprising:
confirming whether the operation of the working machine and the running operation exist or not; and
and supplying a hydraulic pressure for releasing the operation of the parking brake if the operation of the working machine is sensed in a state where the working machine is in a stop operation.
9. The hydraulic system control method of a working machine according to claim 8,
the work machine includes a ripper.
10. The hydraulic system control method of a working machine according to claim 8,
and operating a hydraulic brake for stopping the work machine if the parking brake is released in a state where the work machine is in a stop operation.
11. A work machine, comprising:
a frame;
a travel motor housing provided at one side of the frame;
a discharge hose connected to one side of the travel motor housing;
a second release pressure supply hose connected to the travel motor housing so as to supply a release hydraulic pressure to a parking brake; and
and a pressure oil removal hose provided so as to communicate a second speed control valve with the discharge hose, wherein the second speed control valve is disposed inside the travel motor housing.
CN202210218219.3A 2021-03-03 2022-03-03 Hydraulic system control device for construction machine, construction machine provided with same, and method for same Pending CN115013373A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020210028448A KR20220124847A (en) 2021-03-03 2021-03-03 Hydraulic system control device for construction machinery, construction machinery having the same and method using the same
KR10-2021-0028448 2021-03-03

Publications (1)

Publication Number Publication Date
CN115013373A true CN115013373A (en) 2022-09-06

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Application Number Title Priority Date Filing Date
CN202210218219.3A Pending CN115013373A (en) 2021-03-03 2022-03-03 Hydraulic system control device for construction machine, construction machine provided with same, and method for same

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CN (1) CN115013373A (en)

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