CN111561000A - Hydraulic control circuit, hydraulic circuit control method and engineering machinery - Google Patents
Hydraulic control circuit, hydraulic circuit control method and engineering machinery Download PDFInfo
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- CN111561000A CN111561000A CN202010455123.XA CN202010455123A CN111561000A CN 111561000 A CN111561000 A CN 111561000A CN 202010455123 A CN202010455123 A CN 202010455123A CN 111561000 A CN111561000 A CN 111561000A
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- valve group
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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
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
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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
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/425—Drive systems for dipper-arms, backhoes or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The embodiment of the invention provides a hydraulic control circuit, a hydraulic circuit control method and engineering machinery, and relates to the field of engineering machinery. The hydraulic control loop comprises an energy accumulator, a control valve group, a three-cavity hydraulic cylinder and a multi-way valve; the three-cavity hydraulic cylinder is provided with a first cavity, a second cavity and a third cavity which are separated from each other; the first cavity is connected with the third cavity through a control valve group, one of the first cavity and the third cavity is connected with the energy accumulator through the control valve group, and the other one of the first cavity and the third cavity is connected with the multi-way valve; the control valve group is used for controlling the first containing cavity to be communicated with the oil way of the third containing cavity, or is used for controlling the first containing cavity and the third containing cavity to be communicated with the oil way of the energy accumulator; the second cavity is connected with the multi-way valve; the multi-way valve is used for being connected with a hydraulic pump and a hydraulic oil tank of the engineering machinery respectively. The hydraulic control circuit, the hydraulic circuit control method and the engineering machinery can exert the energy-saving characteristic of the system, have good adaptability and do not need to change the structure of the movable arm machinery.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a hydraulic control circuit, a hydraulic circuit control method and engineering machinery.
Background
The hydraulic excavator as an important construction and mining device plays an important role in the fields of engineering construction, ore mining and the like, and more than 60% of the operations in the earth work in the world are completed by the excavator. However, a large amount of energy is wasted in the working process of the existing excavator, particularly, a movable arm of the excavator frequently lifts and descends in the working process, and a large amount of energy is lost through the energy-saving effect of a valve port.
At present, a mode of combining a three-cavity cylinder and an energy accumulator is adopted to recover gravitational potential energy when a movable arm descends. When the movable arm descends, the gravitational potential energy of the movable arm is stored in the energy accumulator, and when the movable arm is lifted, the energy accumulator releases the stored energy to assist the movable arm to lift and reduce the energy provided by the engine.
However, in this solution, the pressure in the accumulator always supports the boom, so that the working capacity of the boom is limited, and particularly in a deep-digging working condition, the digging force is significantly reduced, and the working requirement cannot be met.
Therefore, the prior art has certain limitations and the excavator has low adaptability.
Disclosure of Invention
The invention aims to provide a hydraulic control circuit, a hydraulic circuit control method and an engineering machine, which can exert the energy-saving characteristic of a system, have good adaptability, do not need to change the structure of a movable arm machine and have the characteristic of simple structure.
The embodiment of the invention is realized by the following steps:
in a first aspect, an embodiment of the present invention provides a hydraulic control circuit, which is used for an engineering machine, and includes an energy accumulator, a control valve group, a three-cavity hydraulic cylinder, and a multi-way valve;
the three-cavity hydraulic cylinder is used for being arranged on a movable arm of the engineering machinery and is provided with a first cavity, a second cavity and a third cavity which are separated from each other, wherein when the volume of the first cavity is increased, the volume of the second cavity is reduced, and the volume of the third cavity is increased;
the first cavity is connected with the third cavity through the control valve group, one of the first cavity and the third cavity is connected with the energy accumulator through the control valve group, and the other one of the first cavity and the third cavity is connected with the multi-way valve;
the control valve group is used for controlling the first cavity and the third cavity to be communicated with the oil way of the energy accumulator, or is used for controlling the connection part of the first cavity and the third cavity with the energy accumulator to be communicated with the oil way of the energy accumulator;
the second cavity is connected with the multi-way valve;
and the multi-way valve is used for being respectively connected with a hydraulic pump and a hydraulic oil tank of the engineering machinery.
In an alternative embodiment, the first cavity is connected to the accumulator through the control valve group, and the third cavity is connected to the multi-way valve;
the engineering machinery is provided with a first working mode and a second working mode, and the control valve group is used for controlling the first containing cavity to be communicated with the oil way of the energy accumulator under the first working mode so as to press hydraulic oil in the first containing cavity into the energy accumulator or release the hydraulic oil in the energy accumulator to the first containing cavity; the control valve group is further used for controlling the first containing cavity to be communicated with the third containing cavity in the second working mode.
In an alternative embodiment, the first chamber is connected to the multi-way valve, and the third chamber is connected to the accumulator through the control valve group;
the engineering machinery has a first working mode and a second working mode, and the control valve group is used for controlling the third cavity to be communicated with the oil way of the energy accumulator in the first working mode so as to press hydraulic oil in the third cavity into the energy accumulator or release the hydraulic oil in the energy accumulator to the third cavity; the control valve group is further used for controlling the first containing cavity to be communicated with the third containing cavity in the second working mode.
In an optional embodiment, the three-cavity hydraulic cylinder includes a cylinder body, a piston rod and a center rod, the center rod is disposed in the cylinder body, the piston rod is provided with the third containing cavity and is movably connected to the center rod, the piston rod divides the cylinder body into the first containing cavity and the second containing cavity, the first containing cavity is a rodless cavity, the second containing cavity is a rod cavity, the cylinder body is configured to be mounted on the engineering machinery, and the piston rod is configured to be in transmission connection with the movable arm.
In an alternative embodiment, the control valve set is a manual valve set, a solenoid valve set, a slide valve type valve set, or a ball valve type valve set.
In a second aspect, an embodiment of the present invention provides a hydraulic circuit control method that uses the hydraulic control circuit according to any one of the preceding embodiments, the hydraulic circuit control method including:
acquiring working condition information of the engineering machinery;
and controlling the control valve group according to the working condition information so as to enable the first cavity to be communicated with the third cavity or enable the first cavity to be communicated with the oil way of the energy accumulator.
In an optional embodiment, the step of controlling the control valve group according to the operating condition information to communicate the first cavity with the third cavity or the oil path of the accumulator includes:
judging whether the working condition represented by the working condition information is a working condition with larger excavating force or not;
and if the working condition represented by the working condition information is a working condition with larger excavating force, controlling the control valve group to enable the first cavity and the third cavity to be communicated with the oil path of the multi-way valve, so that the first cavity and the third cavity are communicated with the oil path of the multi-way valve.
In an optional embodiment, the step of controlling the control valve group according to the operating condition information to communicate the first cavity with the third cavity or the oil path of the accumulator further includes:
and if the working condition represented by the working condition information is not the working condition with larger excavating force, controlling the control valve group to enable the first cavity to be communicated with the oil way of the energy accumulator.
In a third aspect, an embodiment of the invention provides a working machine comprising a hydraulic control circuit as described in any one of the preceding embodiments.
The embodiment of the invention has the beneficial effects that: when the first cavity is connected with the energy accumulator or the third cavity through the control valve group, the control valve group can enable the first cavity to be communicated with the oil way of the energy accumulator or enable the first cavity to be communicated with the oil way of the third cavity.
When the first cavity is communicated with the oil way of the energy accumulator: if the movable arm descends, hydraulic oil output by the hydraulic pump enters the second containing cavity through one port of the multi-way valve, hydraulic oil in the third containing cavity returns through the other port of the multi-way valve, the hydraulic oil in the first containing cavity is pressed into the energy accumulator, the pressure of the energy accumulator rises, and gravitational potential energy of the movable arm is stored in the energy accumulator. If the movable arm is lifted, hydraulic oil output by the hydraulic pump enters the third containing cavity through a port of the multi-way valve, hydraulic oil in the second containing cavity returns through the other port of the multi-way valve, hydraulic oil released by the energy accumulator enters the first containing cavity to assist the movable arm to lift, energy output by the hydraulic pump is reduced, and an energy-saving effect is achieved.
When the first cavity is communicated with the third cavity oil way: if the movable arm is lifted, hydraulic oil output by the hydraulic pump is simultaneously communicated with the first containing cavity and the third containing cavity through the multi-way valve, and hydraulic oil in the second containing cavity returns through a port of the multi-way valve. If the movable arm descends, the hydraulic oil output by the hydraulic pump is communicated through the second containing cavity of the multi-way valve, and the hydraulic oil in the first containing cavity and the hydraulic oil in the third containing cavity return to the oil tank through the multi-way valve, so that the operation capacity of deep digging or the working condition with high digging force demand is ensured, and the working demand is met.
In summary, the hydraulic control circuit, the hydraulic circuit control method and the engineering machine provided by the invention can exert the energy-saving characteristic of the system, have good adaptability, do not need to change the structure of the movable arm machine, and have the characteristic of simple structure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a hydraulic control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a three-chamber hydraulic cylinder in a hydraulic control circuit according to an embodiment of the present invention;
FIG. 3 is a block diagram illustrating a flow chart of a hydraulic circuit control method according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a flow chart of the sub-steps of step S200 in fig. 3.
Icon: 100-a hydraulic control circuit; 110-an accumulator; 120-a control valve group; 130-three-cavity hydraulic cylinder; 131-a first volume; 132-a second cavity; 133-a third cavity; 134-cylinder body; 135-a piston rod; 136-a central rod; 140-multiple way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, a hydraulic control circuit 100 according to an embodiment of the present invention is shown.
The hydraulic control circuit 100 may be applied to a construction machine including a hydraulic device, for example, the hydraulic control circuit 100 may be applied to an excavator. At this time, the hydraulic control circuit 100 may be installed on a boom of an excavator, so that the gravitational potential energy of the excavator boom during the descent may be recovered, and the power output of the excavator boom may be ensured, thereby making the excavator have a stronger adaptability, i.e., not only reducing the system energy consumption, but also being adapted to a deep excavation or a working condition with a large excavation force demand.
In the present embodiment, the hydraulic control circuit 100 includes an accumulator 110, a control valve block 120, a three-chamber hydraulic cylinder 130, and a multiplex valve 140. The three-cavity hydraulic cylinder 130 is configured to be disposed on a movable arm of the engineering machine, and the three-cavity hydraulic cylinder 130 has a first cavity 131, a second cavity 132, and a third cavity 133 that are separated from each other, where when a volume of the first cavity 131 is increased, a volume of the second cavity 132 is decreased, and a volume of the third cavity 133 is increased. The first chamber 131 is connected to the third chamber 133 through the control valve group 120, one of the first chamber 131 and the third chamber 133 is connected to the accumulator 110 through the control valve group 120, and the other is connected to the multiplex valve 140. The control valve group 120 is used for controlling the oil passages of the first cavity 131 and the third cavity 133 to be communicated, or is used for controlling the oil passages of the first cavity 131 and the third cavity 133, which are connected with the energy accumulator 110, to be communicated with the energy accumulator 110. The second chamber 132 is connected to the multiplex valve 140. The multi-way valve 140 is used to connect to a hydraulic pump and a hydraulic oil tank of the construction machine, respectively.
It should be noted that the first chamber 131 and the third chamber 133 have at least two connection forms with the multiplex valve 140 and the accumulator 110:
first, the first chamber 131 is connected to the accumulator 110 through the control valve group 120, and the third chamber 133 is connected to the multiplex valve 140. The control valve group 120 is used for controlling the first cavity 131 to be in oil-way communication with the third cavity 133, or controlling the first cavity 131 to be in oil-way communication with the accumulator 110.
The second and third chambers 133 are connected to the accumulator 110 via the control valve group 120, and the first chamber 131 is connected to the multiplex valve 140. The control valve group 120 is used for controlling the first cavity 131 to be in oil-way communication with the third cavity 133, or controlling the third cavity 133 to be in oil-way communication with the accumulator 110.
It should be noted that the construction machine provided by the embodiment of the present invention has at least two operation modes, i.e., a first operation mode and a second operation mode. The first operation mode is an energy saving operation mode in which the hydraulic control circuit 100 can recover potential energy of lowering of the boom to the accumulator 110 and supply hydraulic oil of the accumulator 110 to the boom for lifting. The second working mode is a normal working mode, in this working mode, the first cavity 131 is in oil-way communication with the third cavity 133, and the energy accumulator 110 does not work, and can provide a larger power output for the movable arm, so as to adapt to a deep digging or a large digging force working condition.
Meanwhile, it should be noted that the hydraulic control circuit 100 provided in the embodiment of the present invention can flexibly adjust the two working modes, so that a user can give priority to the working capacity and the excavating force and store energy through the energy storage device 110 when the working condition of deep excavation or large excavating force is not required, thereby reducing energy consumption.
In the embodiment of the present invention, when the first cavity 131 is connected to the accumulator 110 through the control valve set 120, the control valve set 120 can control the first cavity 131 to be in oil-way communication with the accumulator 110 or the third cavity 133.
When the first cavity 131 is communicated with the oil path of the energy accumulator 110, the engineering machinery is in a first working mode, hydraulic oil in the first cavity 131 can be pressed into the energy accumulator 110, potential energy generated by descending of the movable arm is recovered, and when the movable arm lifts, the energy accumulator 110 is used for assisting energy supply. Thereby achieving the energy-saving effect.
When the first cavity 131 is communicated with the third cavity 133 in an oil way, the engineering machinery is in the second working mode, the first cavity 131 and the third cavity 133 can be communicated with the oil way of the multi-way valve 140, and hydraulic oil in the second cavity 132 returns through the multi-way valve 140. When the movable arm descends, hydraulic oil output by the hydraulic pump is simultaneously communicated with the second chamber 132 through the multi-way valve 140, and the hydraulic oil in the first chamber 131 and the third chamber 133 returns to the oil tank through the multi-way valve 140. When the requirement of deep digging or digging force is large, the influence of the energy accumulator 110 can not be caused, and the working requirement can be met.
When the first cavity 131 is connected to the energy accumulator 110 through the control valve group 120 and the third cavity 133 is connected to the multi-way valve 140, as described above, the control valve group 120 is configured to control the oil passage communication between the first cavity 131 and the energy accumulator 110 in the first working mode, so that the hydraulic oil in the first cavity 131 is pressed into the energy accumulator 110 or the hydraulic oil in the energy accumulator 110 is released to the first cavity 131; the control valve group 120 is further configured to control the communication between the first volume 131 and the third volume 133 in the second operation mode.
When the first cavity 131 is connected with the multi-way valve 140 and the third cavity 133 is connected with the energy accumulator 110 through the control valve group 120, the control valve group 120 is used for controlling the oil passage communication between the third cavity 133 and the energy accumulator 110 in the first working mode, so that the hydraulic oil in the third cavity 133 is pressed into the energy accumulator 110 or the hydraulic oil in the energy accumulator 110 is released to the third cavity 133; the control valve group 120 is further configured to control the communication between the first volume 131 and the third volume 133 in the second operation mode.
Referring to fig. 2, optionally, the three-cavity hydraulic cylinder 130 includes a cylinder body 134, a piston rod 135 and a center rod 136, the center rod 136 is disposed in the cylinder body 134, the piston rod 135 is provided with a third cavity 133 and movably connected to the center rod 136, the piston rod 135 divides the cylinder body 134 into a first cavity 131 and a second cavity 132, wherein the first cavity 131 is a rodless cavity, the second cavity 132 is a rod cavity, the cylinder body 134 is configured to be mounted on an engineering machine, and the piston rod 135 is configured to be in transmission connection with a movable arm.
Alternatively, the control valve assembly 120 may be a manual valve assembly, a solenoid valve assembly, a slide valve assembly, or a ball valve assembly. The specific structural form of the control valve group 120 is not limited in the embodiment of the present invention, as long as the first cavity 131 or the third cavity 133 can be connected to the energy accumulator 110, and the first cavity 131 is connected to the third cavity 133.
It should be particularly noted that, in the hydraulic control circuit 100 provided in the embodiment of the present invention, in an actual operation, a user may select the different operation modes according to an actual working condition. The method comprises the following steps of (1) preferably considering reduction of system oil consumption under a common working condition, namely the first working mode; under the working condition of deep excavation or large excavation force, the operation capacity and the excavation force are considered preferentially, namely the second working mode. On the premise of ensuring that the operation capacity is not changed, the energy-saving characteristic of the system is exerted as much as possible, and the adaptability and the characteristic are better.
Referring to fig. 3, an embodiment of the present invention provides a hydraulic circuit control method using the hydraulic control circuit 100 according to any one of the previous embodiments.
The hydraulic circuit control method includes the steps of:
step S100: acquiring working condition information of the engineering machinery;
step S200: according to the operating condition information, the control valve group 120 is controlled such that the first chamber 131 is in oil communication with the third chamber 133, or the first chamber 131 is in oil communication with the accumulator 110.
Referring to fig. 4, the step S200 may include the following sub-steps:
substep S210: judging whether the working condition represented by the working condition information is a working condition with larger excavating force or not;
if the working condition represented by the working condition information is a working condition with a large excavating force, the substep S220 is executed: the control valve group 120 is controlled such that the first chamber 131 and the third chamber 133 are in oil-line communication, and thus both the first chamber 131 and the third chamber 133 are in oil-line communication with the multi-way valve 140.
Otherwise, performing substep S230: the control valve group 120 is controlled such that the first capacity 131 is in oil-communication with the accumulator 110.
Furthermore, an embodiment of the present invention further provides a working machine including the hydraulic control circuit 100 according to any one of the foregoing embodiments, and the working machine includes, but is not limited to, an excavator.
Referring to fig. 1 to 4, a hydraulic control circuit 100, a hydraulic circuit control method, and a construction machine according to an embodiment of the present invention: when the first cavity 131 is connected to the accumulator 110 or the third cavity 133 through the control valve group 120, the control valve group 120 may be in oil-way communication between the first cavity 131 and the accumulator 110, or between the first cavity 131 and the third cavity 133.
When the first receptacle 131 is in oil-path communication with the accumulator 110: if the movable arm descends, hydraulic oil output by the hydraulic pump enters the second cavity 132 through one port of the multi-way valve 140, hydraulic oil in the third cavity 133 returns through the other port of the multi-way valve 140, the hydraulic oil in the first cavity 131 is pressed into the energy accumulator 110, the pressure of the energy accumulator 110 rises, and gravitational potential energy of the movable arm is stored in the energy accumulator 110. If the movable arm is lifted, the hydraulic oil output by the hydraulic pump enters the third cavity 133 through the port of the multi-way valve 140, the hydraulic oil in the second cavity 132 returns through the other port of the multi-way valve 140, the hydraulic oil released by the energy accumulator 110 enters the first cavity 131, the movable arm is assisted to be lifted, the energy output by the hydraulic pump is reduced, and the energy-saving effect is achieved.
When the first volume 131 is in oil-path communication with the third volume 133: if the movable arm is lifted, the hydraulic oil output by the hydraulic pump is simultaneously communicated with the first chamber 131 and the third chamber 133 through the multi-way valve 140, and the hydraulic oil in the second chamber 132 returns through a port of the multi-way valve 140. If the movable arm descends, the hydraulic oil output by the hydraulic pump is communicated with the second cavity 132 through the multi-way valve 140, and the hydraulic oil in the first cavity 131 and the third cavity 133 returns to the oil tank through the multi-way valve 140, so that the working capacity of deep digging or the working condition with large digging force demand is ensured, and the working demand is met.
In summary, the hydraulic control circuit 100, the hydraulic circuit control method, and the engineering machine provided by the present invention can exhibit the energy saving characteristic of the system, have good adaptability, do not need to change the structure of the boom machine, and have the characteristic of simple structure.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A hydraulic control circuit for a construction machine is characterized in that the hydraulic control circuit (100) comprises an energy accumulator (110), a control valve group (120), a three-cavity hydraulic cylinder (130) and a multi-way valve (140);
the three-cavity hydraulic cylinder (130) is used for being arranged on a movable arm of the engineering machinery, and the three-cavity hydraulic cylinder (130) is provided with a first cavity (131), a second cavity (132) and a third cavity (133) which are separated from each other, wherein when the volume of the first cavity (131) is increased, the volume of the second cavity (132) is reduced, and the volume of the third cavity (133) is increased;
the first cavity (131) is connected with the third cavity (133) through the control valve group (120), one of the first cavity (131) and the third cavity (133) is connected with the energy accumulator (110) through the control valve group (120), and the other is connected with the multi-way valve (140);
the control valve group (120) is used for controlling the oil way communication between the first cavity (131) and the third cavity (133), or is used for controlling the oil way communication between one of the first cavity (131) and the third cavity (133) which is connected with the energy accumulator (110) and the energy accumulator (110);
the second cavity (132) is connected with the multi-way valve (140);
the multi-way valve (140) is used for being respectively connected with a hydraulic pump and a hydraulic oil tank of the engineering machinery.
2. The hydraulic control circuit according to claim 1, characterized in that the first volume (131) is connected to the accumulator (110) through the control valve group (120), the third volume (133) being connected to the multiplex valve (140);
the engineering machinery is provided with a first working mode and a second working mode, and the control valve group (120) is used for controlling the first containing cavity (131) to be communicated with an oil way of the energy accumulator (110) in the first working mode so as to press hydraulic oil in the first containing cavity (131) into the energy accumulator (110) or release hydraulic oil in the energy accumulator (110) to the first containing cavity (131); the control valve group (120) is further configured to control the first cavity (131) to communicate with the third cavity (133) in the second operating mode.
3. The hydraulic control circuit according to claim 1, characterized in that the first volume (131) is connected to the multiplex valve (140), the third volume (133) being connected to the accumulator (110) through the control valve group (120);
the engineering machinery is provided with a first working mode and a second working mode, and the control valve group (120) is used for controlling the third containing cavity (133) to be communicated with an oil way of the energy accumulator (110) in the first working mode so as to press hydraulic oil in the third containing cavity (133) into the energy accumulator (110) or release hydraulic oil in the energy accumulator (110) to the third containing cavity (133); the control valve group (120) is further configured to control the first cavity (131) to communicate with the third cavity (133) in the second operating mode.
4. The hydraulic control circuit according to any one of claims 1 to 3, wherein the three-chamber hydraulic cylinder (130) comprises a cylinder body (134), a piston rod (135) and a center rod (136), the center rod (136) is disposed in the cylinder body (134), the piston rod (135) is provided with the third chamber (133) and is movably connected with the center rod (136), the piston rod (135) divides the cylinder body (134) into the first chamber (131) and the second chamber (132), wherein the first chamber (131) is a rodless chamber, the second chamber (132) is a rod chamber, the cylinder body (134) is configured to be mounted on the working machine, and the piston rod (135) is configured to be in transmission connection with the movable arm.
5. The hydraulic control circuit according to any one of claims 1-3, characterized in that the control valve block (120) is a manual valve block, a solenoid valve block, a slide valve block, or a ball valve block.
6. A hydraulic circuit control method that utilizes the hydraulic control circuit (100) according to any one of claims 1-5, characterized by comprising:
acquiring working condition information of the engineering machinery;
and controlling the control valve group (120) according to the working condition information so as to enable the first cavity (131) to be communicated with the third cavity (133), or enable the first cavity (131) to be communicated with an oil way of the energy accumulator (110).
7. The hydraulic circuit control method according to claim 6, wherein the step of controlling the control valve group (120) to place the first volume (131) in oil-communication with the third volume (133) or the accumulator (110) according to the operating condition information comprises:
judging whether the working condition represented by the working condition information is a working condition with larger excavating force or not;
and if the working condition represented by the working condition information is a working condition with larger excavating force, controlling the control valve group (120) to enable the first cavity (131) to be communicated with the oil path of the third cavity (133), so that the first cavity (131) and the third cavity (133) are communicated with the oil path of the multi-way valve (140).
8. The hydraulic circuit control method according to claim 7, wherein the step of controlling the control valve group (120) to place the first volume (131) in oil-line communication with the third volume (133) or the accumulator (110) according to the operating condition information further comprises:
and if the working condition represented by the working condition information is not a working condition with larger excavating force, controlling the control valve group (120) so as to communicate the first cavity (131) with the oil way of the energy accumulator (110).
9. A working machine, characterized in that it comprises a hydraulic control circuit (100) according to any one of claims 1-5.
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| CN202010455123.XA CN111561000A (en) | 2020-05-26 | 2020-05-26 | Hydraulic control circuit, hydraulic circuit control method and engineering machinery |
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| CN106193174A (en) * | 2016-08-31 | 2016-12-07 | 徐州徐工挖掘机械有限公司 | A kind of energy-conservation action system of Hydraulic Excavator's Boom |
| CN107061430A (en) * | 2017-04-10 | 2017-08-18 | 太原理工大学 | The hoisting system of minus flow hydraulic circuit control |
| CN110541448A (en) * | 2019-09-12 | 2019-12-06 | 三一重机有限公司 | Excavator movable arm hydraulic control system and excavator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5522212A (en) * | 1994-12-21 | 1996-06-04 | Kubik; Philip A. | Rod equal displacement cylinder in a rapid transfer and feed system |
| CN106193174A (en) * | 2016-08-31 | 2016-12-07 | 徐州徐工挖掘机械有限公司 | A kind of energy-conservation action system of Hydraulic Excavator's Boom |
| CN107061430A (en) * | 2017-04-10 | 2017-08-18 | 太原理工大学 | The hoisting system of minus flow hydraulic circuit control |
| CN110541448A (en) * | 2019-09-12 | 2019-12-06 | 三一重机有限公司 | Excavator movable arm hydraulic control system and excavator |
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