CN110541448A - Excavator movable arm hydraulic control system and excavator - Google Patents
Excavator movable arm hydraulic control system and excavator Download PDFInfo
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- CN110541448A CN110541448A CN201910850065.8A CN201910850065A CN110541448A CN 110541448 A CN110541448 A CN 110541448A CN 201910850065 A CN201910850065 A CN 201910850065A CN 110541448 A CN110541448 A CN 110541448A
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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
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
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- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
the disclosure provides an excavator movable arm hydraulic control system and an excavator, and relates to the field of mechanical equipment. The system comprises: the hydraulic excavator comprises a first hydraulic oil tank, an operating handle, a reversing valve, a first proportional valve, an energy accumulator, a second hydraulic oil tank and a three-cavity hydraulic oil cylinder for driving a movable arm of the excavator, wherein the operating handle is communicated with a pilot end of the reversing valve, a first working end of the reversing valve is used for communicating a first pilot end of the first proportional valve with the operating handle and communicating a second pilot end of the first proportional valve with the second hydraulic oil tank, a second working end of the reversing valve is used for communicating a first pilot end of the first proportional valve and a second pilot end of the first proportional valve with the second hydraulic oil tank, one side of the working end of the first proportional valve is communicated with a rodless cavity of the three-cavity hydraulic oil cylinder and the first pilot end of the first proportional valve, and the other side of the working end of the first proportional valve is communicated with the energy accumulator and the second pilot end of the first proportional valve. The present disclosure can improve energy recovery efficiency.
Description
Technical Field
The disclosure relates to the field of mechanical equipment, in particular to a movable arm hydraulic control system of an excavator and the excavator.
Background
The hydraulic excavator is an important mechanical device, during the operation process of the hydraulic excavator, the movable arm can be frequently lifted and lowered, the working device of the hydraulic excavator is heavy in weight and large in inertia, in order to prevent the upper cavity of the movable arm hydraulic cylinder from being emptied due to the fact that the movable arm descends too fast, during the process of controlling the movable arm to be lowered, most of gravitational potential energy of the movable arm is consumed and wasted in the form of heat energy, energy waste is caused, and the temperature of a system can be increased and the service life of hydraulic components can be shortened.
In the prior art, a storage battery or a super capacitor can be arranged in the excavator, so that gravitational potential energy generated when the movable arm is lowered is converted into electric energy to be stored, and the electric energy is converted when the movable arm is lifted. However, the storage battery has slow dynamic response, low power during charging and discharging, and the super capacitor has high cost, and the super capacitor needs to perform multiple energy conversion links, so that the efficiency of energy recovery is low, and the actual working requirements are difficult to meet.
Disclosure of Invention
The object of the present disclosure is to provide an excavator movable arm hydraulic control system and an excavator, so as to improve energy recovery efficiency.
In order to achieve the above purpose, the technical scheme adopted by the disclosure is as follows:
In a first aspect, the present disclosure provides an excavator boom hydraulic control system, the system comprising: the hydraulic excavator comprises a first hydraulic oil tank, an operating handle, a reversing valve, a first proportional valve, an energy accumulator, a second hydraulic oil tank and a three-cavity hydraulic oil cylinder for driving a movable arm of the excavator;
The operating handle is communicated with a pilot end of the reversing valve;
The first working end of the reversing valve is used for communicating the first pilot end of the first proportional valve with the operating handle and communicating the second pilot end of the first proportional valve with the second hydraulic oil tank, and the second working end of the reversing valve is used for communicating the first pilot end of the first proportional valve and the second pilot end of the first proportional valve with the second hydraulic oil tank;
One side of the working end of the first proportional valve is communicated with a rodless cavity of the three-cavity hydraulic oil cylinder and a first pilot end of the first proportional valve, and the other side of the working end of the first proportional valve is communicated with the energy accumulator and a second pilot end of the first proportional valve.
Optionally, the system further comprises a main pump and a multi-way valve, and the operating handle is further communicated with a pilot end of the multi-way valve;
The first working end of the multi-way valve is used for respectively communicating the oil outlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder, the oil inlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder, and the second working end of the multi-way valve is used for respectively communicating the oil outlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder, and the oil inlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder;
The main pump is connected in series between the multi-way valve and the oil outlet of the first hydraulic oil tank.
Optionally, the system further comprises a second proportional valve, a pilot end of the second proportional valve is communicated with the rod cavity of the three-cavity hydraulic oil cylinder, and a working end of the second proportional valve is respectively communicated with the rodless cavity of the three-cavity hydraulic oil cylinder and the oil inlet of the first hydraulic oil tank.
Optionally, the system further comprises a safety valve, an oil outlet of the safety valve is communicated with an oil inlet of the first hydraulic oil tank, and an oil inlet of the safety valve is arranged between the rodless cavity of the three-cavity hydraulic oil cylinder and the working end of the first proportional valve.
Optionally, the accumulator is further communicated with an oil outlet of the first hydraulic oil tank through the main pump, and the system further includes a first switch valve, and the first switch valve is connected in series between the accumulator and the main pump.
Optionally, the system further includes a first check valve connected in series between the accumulator and the main pump, and a direction of the first check valve is a direction in which the main pump flows to the accumulator.
Optionally, the system further comprises a second on-off valve in series with the accumulator.
optionally, the system further includes a second check valve, an oil inlet of the second check valve is communicated with the first hydraulic oil tank, and an oil outlet of the second check valve is disposed between the rodless cavity of the three-cavity hydraulic oil cylinder and the working end of the first proportional valve.
Optionally, the multi-way valve and the reversing valve are three-position four-way valves.
In a second aspect, the present disclosure also proposes an excavator comprising an excavator boom hydraulic control system according to any one of the first aspect.
In the embodiment of the disclosure, an operating handle 2 in an excavator boom hydraulic control system is communicated with a pilot end of a reversing valve 3, a first working end of the reversing valve 3 is used for communicating a first pilot end of a first proportional valve 4 with the operating handle 2 and communicating a second pilot end of the first proportional valve 4 with a second hydraulic oil tank 6, a second working end of the reversing valve 3 is used for communicating both the first pilot end of the first proportional valve 4 and a second pilot end of the first proportional valve 4 with the second hydraulic oil tank 6, one side of the working end of the first proportional valve 4 is communicated with a rodless cavity 71 of a three-cavity hydraulic oil cylinder 7 and a first pilot end of the first proportional valve 4, and the other side of the working end of the first proportional valve 4 is communicated with an energy accumulator 5 and a second pilot end of the first proportional valve 4. Therefore, in the process of lowering the movable arm of the excavator, the first proportional valve 4 can be controlled to be opened or closed according to the oil hydraulic pressure of the accumulator 5 and the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 through the operating handle 2 and the reversing valve 3, when the oil pressure of the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 is larger than the oil pressure of the energy accumulator 5, so as to store the oil in the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 to the energy accumulator 5, and correspondingly, during the lifting process of the movable arm of the excavator, the communication of the first proportional valve 4 can be controlled by the operating handle 2 and the reversing valve 3, thereby leading the oil liquid stored in the energy accumulator 5 to enter the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7, namely, realizing the energy recovery and utilization of the movable arm of the excavator through the energy accumulator 5, compared with the energy recovery by adopting a storage battery or a super capacitor, the energy recovery and utilization efficiency is improved.
additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
To more clearly illustrate the technical solutions of the present disclosure, the drawings needed for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure, and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 shows a structural schematic diagram of an excavator boom hydraulic control system provided by the present disclosure;
Fig. 2 shows a structural schematic diagram of an excavator boom hydraulic control system when an excavator boom is lowered, according to the present disclosure;
FIG. 3 is a schematic structural diagram illustrating an excavator boom hydraulic control system when an excavator boom is lifted according to the disclosure;
FIG. 4 illustrates a schematic structural diagram of another excavator boom hydraulic control system provided by the present disclosure;
Fig. 5 shows a schematic structural view of an excavator boom hydraulic control system when another excavator boom provided by the present disclosure is lowered;
FIG. 6 is a schematic structural diagram illustrating an excavator boom hydraulic control system when another excavator boom provided by the present disclosure is raised;
FIG. 7 illustrates a schematic structural diagram of another excavator boom hydraulic control system provided by the present disclosure;
FIG. 8 illustrates a schematic structural diagram of another excavator boom hydraulic control system provided by the present disclosure;
FIG. 9 illustrates a schematic structural diagram of another excavator boom hydraulic control system provided by the present disclosure;
FIG. 10 illustrates a schematic structural diagram of another excavator boom hydraulic control system provided by the present disclosure;
FIG. 11 illustrates a schematic structural diagram of another excavator boom hydraulic control system provided by the present disclosure;
Fig. 12 shows a schematic structural diagram of another excavator boom hydraulic control system provided by the present disclosure.
Icon: 1-a first hydraulic tank; 2-operating a handle; 3-a reversing valve; 4-a first proportional valve; 5-an accumulator; 6-a second hydraulic tank; 7-three-cavity hydraulic oil cylinder; 71-rodless cavity; 72-a rod cavity; 73-shaft cavity; 8-the main pump; 9-a multi-way valve; 10-a second proportional valve; 11-safety valve; 12-a first on-off valve; 13-a first one-way valve; 14-a second on-off valve; 15-second one-way valve.
Detailed Description
The technical solution in the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the present disclosure.
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.
before explaining the present disclosure in detail, an application scenario of the present disclosure will be described.
Fig. 1 is a schematic structural diagram of a hydraulic control system for a boom of an excavator according to the present disclosure. The system comprises: a first hydraulic oil tank 1, an operating handle 2 and a reversing valve 3, the hydraulic excavator comprises a first proportional valve 4, an energy accumulator 5, a second hydraulic oil tank 6 and a three-cavity hydraulic oil cylinder 7 for driving a movable arm of the excavator, an operating handle 2 is communicated with a pilot end of a reversing valve 3, a first working end of the reversing valve 3 is used for communicating a first pilot end of the first proportional valve 4 with the operating handle 2 and communicating a second pilot end of the first proportional valve 4 with the second hydraulic oil tank 6, a second working end of the reversing valve 3 is used for communicating the first pilot end of the first proportional valve 4 and a second pilot end of the first proportional valve 4 with the second hydraulic oil tank 6, one side of the working end of the first proportional valve 4 is communicated with a rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 and the first pilot end of the first proportional valve 4, and the other side of the working end of the first proportional valve 4 is communicated with the energy accumulator 5 and the second pilot end of the first proportional valve 4.
In order to reduce the problem of low energy recovery efficiency caused by slow dynamic response, low charging and discharging power and multiple energy conversions when a storage battery and a super capacitor are used for energy recovery, the disclosure provides an excavator movable arm hydraulic control system for energy recovery by using an energy accumulator 5.
The first hydraulic oil tank 1 may be used to store and provide oil in the excavator boom hydraulic control system, and the second hydraulic oil tank 6 may also be used to store oil in the excavator boom hydraulic control system.
the operating handle 2 can be used for controlling pilot oil to reach a pilot end of the reversing valve 3, so that the working end of the reversing valve 3 is controlled to work, and the movable arm of the excavator is controlled to lift up or lower down.
Alternatively, a pilot pump may be provided between the first hydraulic oil tank 1 and the operating handle 2 so that pilot oil is supplied to the operating handle 2 through the pilot pump.
Of course, in practical applications, the pilot oil may be input to the operating handle 2 in other manners, and the manner of inputting the pilot oil to the operating handle 2 in the embodiment of the present disclosure is not particularly limited.
The reversing valve 3 may include two working ends and a pilot end, and the pressure of the pilot oil acts on the pilot end to displace the spool of the reversing valve 3, so as to control the spool of the reversing valve 3 to move, thereby switching the working end currently working in the reversing valve 3.
Optionally, referring to fig. 1, the reversing valve 3 is a three-position four-way valve. Wherein the first working end is located at the left side of the reversing valve 3, and the second working end is located at the right side of the reversing valve 3. When the pilot oil reaches the pilot end on the right side of the reversing valve 3, the valve core of the reversing valve 3 moves to the left, the second working end works, when the pilot oil reaches the left side of the reversing valve 3, the valve core of the reversing valve 3 moves to the right, and the first working end works.
of course, in practical applications, the direction valve 3 may be of other types, for example, it may include more working ends, as long as it includes the first working end and the second working end of the direction valve 3 as described above.
The first proportional valve 4 may include a working end and a pilot end, wherein the pilot end may include a first pilot end and a second pilot end, and the working end and the non-working end may be disposed on a spool of the first proportional valve 4. The pilot end can displace under the pressure of pilot oil to control whether the working end of the first proportional valve 4 works or not.
The accumulator 5 can be used for storing or releasing oil, thereby achieving the purpose of energy recovery or release.
And the three-cavity hydraulic oil cylinder 7 can be used for driving a movable arm of the excavator to lift up or lower.
referring to fig. 2, when the boom of the excavator is controlled to be lowered, the operating handle 2 may be controlled to move in a first designated direction, and the pilot oil reaches the pilot end on the right side of the directional control valve 3. When the pilot oil reaches the pilot end on the right side of the reversing valve 3, the spool of the reversing valve 3 moves to the left, the second working end of the reversing valve 3 starts to work, the first pilot end of the first proportional valve 4 and the second pilot end of the first proportional valve 4 are both communicated with the second hydraulic oil tank 6, and because one side of the working end of the first proportional valve 4 is communicated with the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 and the first pilot end of the first proportional valve 4, and the other side of the working end of the first proportional valve 4 is communicated with the energy accumulator 5 and the second pilot end of the first proportional valve 4, whether the first proportional valve 4 is communicated or not depends on the oil pressure of the rodless cavities 71 of the energy accumulator 5 and the three-cavity hydraulic oil cylinder 7. At the initial stage of lowering the movable arm of the excavator, the oil pressure of the energy accumulator 5 is smaller than the oil pressure of the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7, so that the working end of the first proportional valve 4 works, the oil in the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 enters the energy accumulator 5 to be stored, and the energy for lowering the movable arm of the excavator is recovered.
Referring to fig. 3, when the boom of the excavator is controlled to be lifted up, the operating handle 2 may be controlled to move in a second designated direction, and the pilot oil reaches the pilot end on the left side of the directional control valve 3. When the pilot oil reaches the pilot end on the left side of the reversing valve 3, the valve core of the reversing valve 3 moves to the right, the first working end of the reversing valve 3 starts to work, the first pilot end of the first proportional valve 4 is communicated with the operating handle 2, the second pilot end of the first proportional valve 4 is communicated with the second hydraulic oil tank 6, the pilot oil reaches the first pilot end of the first proportional valve 4, at the moment, the oil pressure of the second pilot end of the first proportional valve 4 is larger than that of the first pilot end of the first proportional valve 4, therefore, the first proportional valve 4 is communicated, and the oil stored in the energy accumulator 5 enters the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7, so that the recovered energy is reused for lifting of the movable arm of the excavator.
It should be noted that the first designated direction and the second designated direction may be obtained by setting in advance, for example, the first designated direction and the second designated direction may be opposite directions.
in the embodiment of the disclosure, an operating handle 2 in an excavator boom hydraulic control system is communicated with a pilot end of a reversing valve 3, a first working end of the reversing valve 3 is used for communicating a first pilot end of a first proportional valve 4 with the operating handle 2 and communicating a second pilot end of the first proportional valve 4 with a second hydraulic oil tank 6, a second working end of the reversing valve 3 is used for communicating both the first pilot end of the first proportional valve 4 and a second pilot end of the first proportional valve 4 with the second hydraulic oil tank 6, one side of the working end of the first proportional valve 4 is communicated with a rodless cavity 71 of a three-cavity hydraulic oil cylinder 7 and a first pilot end of the first proportional valve 4, and the other side of the working end of the first proportional valve 4 is communicated with an energy accumulator 5 and a second pilot end of the first proportional valve 4. Therefore, in the process of lowering the movable arm of the excavator, the first proportional valve 4 can be controlled to be opened or closed according to the oil hydraulic pressure of the accumulator 5 and the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 through the operating handle 2 and the reversing valve 3, when the oil pressure of the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 is larger than the oil pressure of the energy accumulator 5, so as to store the oil in the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 to the energy accumulator 5, and correspondingly, during the lifting process of the movable arm of the excavator, the communication of the first proportional valve 4 can be controlled by the operating handle 2 and the reversing valve 3, thereby leading the oil liquid stored in the energy accumulator 5 to enter the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7, namely, realizing the energy recovery and utilization of the movable arm of the excavator through the energy accumulator 5, compared with the energy recovery by adopting a storage battery or a super capacitor, the energy recovery and utilization efficiency is improved.
Optionally, referring to fig. 4, the system further includes a main pump 8 and a multi-way valve 9, the operating handle 2 is further communicated with a pilot end of the multi-way valve 9, a first working end of the multi-way valve 9 is used for respectively communicating an oil outlet of the first hydraulic oil tank 1 with a rod cavity 72 of the three-cavity hydraulic oil cylinder 7, an oil inlet of the first hydraulic oil tank 1 with a rod cavity 73 of the three-cavity hydraulic oil cylinder 7, a second working end of the multi-way valve 9 is used for respectively communicating an oil outlet of the first hydraulic oil tank 1 with the rod cavity 73 of the three-cavity hydraulic oil cylinder 7, and an oil inlet of the first hydraulic oil tank 1 with the rod cavity 72 of the three-cavity hydraulic oil cylinder 7, and the main pump 8 is connected in series between the multi-way valve 9.
The main pump 8 may be used as a power element in an excavator boom hydraulic control system to provide oil to an oil circuit in the excavator boom hydraulic control system, including providing oil to the rod chamber 72 or the rod chamber 73 of the three-chamber hydraulic cylinder 7.
The multi-way valve 9 may include two working ends and a pilot end, the working ends may be disposed on a spool of the multi-way valve 9, and the pilot end may be displaced under the pressure of pilot oil to control the spool of the multi-way valve 9 to move, thereby switching the current effective working end in the multi-way valve 9.
Optionally, referring to fig. 4, the multi-way valve 9 is a three-position four-way valve. The first working end is located on the right side of the multi-way valve 9, the second working end is located on the left side of the multi-way valve 9, when the pilot oil reaches the pilot end on the right side of the multi-way valve 9, the spool of the multi-way valve 9 moves to the left, the first working end works, when the pilot oil reaches the pilot end on the left side of the multi-way valve 9, the spool of the multi-way valve 9 moves to the right, and the second working end works.
Of course, in practical applications, the multi-way valve 9 may be of other types, for example, it may include more working ends as long as the first working end and the second working end of the multi-way valve 9 are included.
referring to fig. 5, when the boom of the excavator is controlled to be lowered, the operating handle 2 may be controlled to move in a first designated direction, and the pilot oil reaches the right pilot end of the multi-way valve 9. When the pilot oil reaches the pilot end on the right side of the multi-way valve 9, the valve core of the multi-way valve 9 moves to the left, the first working end of the multi-way valve 9 starts to work, the oil outlet of the first hydraulic oil tank 1 is communicated with the rod cavity 72 of the three-cavity hydraulic oil cylinder 7, the oil inlet of the first hydraulic oil tank 1 is communicated with the rod cavity 73 of the three-cavity hydraulic oil cylinder 7, therefore, the oil can be conveyed to the rod cavity 72 of the three-cavity hydraulic oil cylinder 7 through the main pump 8, and the oil in the rod cavity 73 of the three-cavity hydraulic oil cylinder 7 flows back to the first hydraulic oil tank 1.
Referring to fig. 6, when the boom of the excavator is controlled to be lifted up, the operating handle 2 may be controlled to move in the second designated direction, and the pilot oil reaches the left pilot end of the multi-way valve 9. When the pilot oil reaches the pilot end on the left side of the multi-way valve 9, the valve core of the multi-way valve 9 moves to the right, the second working end of the multi-way valve 9 starts to work, the oil outlet of the first hydraulic oil tank 1 is communicated with the rod cavity 73 of the three-cavity hydraulic oil cylinder 7, the oil inlet of the first hydraulic oil tank 1 is communicated with the rod cavity 72 of the three-cavity hydraulic oil cylinder 7, therefore, the oil can be conveyed to the rod cavity 73 of the three-cavity hydraulic oil cylinder 7 through the main pump 8, and the oil in the rod cavity 72 of the three-cavity hydraulic oil cylinder 7 flows back to the first hydraulic oil tank 1.
optionally, referring to fig. 7, the system further includes a second proportional valve 10, a pilot end of the second proportional valve 10 is communicated with the rod cavity 72 of the three-cavity hydraulic cylinder 7, and a working end of the second proportional valve 10 is respectively communicated with the rodless cavity 71 of the three-cavity hydraulic cylinder 7 and the oil inlet of the first hydraulic oil tank 1.
In the process of lowering the movable arm of the excavator, whether the first proportional valve 4 is switched on or off can be determined by the oil pressure of the rod cavity 72 of the three-cavity hydraulic oil cylinder 7 and the oil pressure of the energy accumulator 5, and when the pressure of the rod cavity 72 of the three-cavity hydraulic oil cylinder 7 is smaller than or equal to the pressure of the energy accumulator 5, the first proportional valve 4 is closed so as to cut off the energy accumulation, so that the cutting-off process of the energy accumulation is more stable, the possibility that the lowering of the movable arm of the excavator is hindered due to the fact that the oil pressure of the rod cavity 72 of the three-cavity hydraulic oil cylinder 7 is larger is reduced, and the excavating force is increased, the second proportional valve 10 can be arranged, and the oil in the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 can.
The second proportional valve 10 may be opened when the pressure of the oil at the leading end reaches a first preset pressure, so that the oil in the rodless chamber 71 of the three-chamber hydraulic cylinder 7 may enter the first hydraulic oil tank 1 through the second proportional valve 10.
in practical application, the first preset pressure may be determined according to the excavator boom hydraulic control system, and the corresponding second proportional valve 10 may be selected.
In the process of lowering the movable arm of the excavator, oil stored in the energy accumulator 5 is gradually increased, and the oil pressure in the rod-free cavity 71 of the energy accumulator 5 and the three-cavity hydraulic oil cylinder 7 is also higher, so that the pressure in the rod-containing cavity 72 of the three-cavity hydraulic oil cylinder 7 is increased, the second proportional valve 10 is opened, and the oil in the rod-free cavity 71 of the three-cavity hydraulic oil cylinder 7 can enter the first hydraulic oil tank 1 through the second proportional valve 10.
Optionally, referring to fig. 8, the system further includes a safety valve 11, an oil outlet of the safety valve 11 is communicated with an oil inlet of the first hydraulic oil tank 1, and an oil inlet of the safety valve 11 is disposed between the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 and the working end of the first proportional valve 4.
Since a safety problem may occur in the excavator boom hydraulic control system when the oil pressure of the circuit in the excavator boom hydraulic control system is excessively high, a safety valve 11 may be provided in the system in order to further improve the safety of the excavator boom hydraulic control system.
The safety valve 11 can be opened when the oil pressure at the oil inlet is greater than a second preset pressure, so that the oil from the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 or the first proportional valve 4 can enter the first hydraulic oil tank 1.
In practical application, the second preset pressure may be determined according to the excavator boom hydraulic control system, and the corresponding relief valve 11 may be selected.
optionally, referring to fig. 9, the accumulator 5 is further communicated with the oil outlet of the first hydraulic oil tank 1 through the main pump 8, and the system further includes a first switch valve 12, and the first switch valve 12 is connected in series between the accumulator 5 and the main pump 8.
In order to supplement the accumulator 5 with oil and ensure that the lifting force can be better provided during the lifting process of the excavator boom, the accumulator 5 is also communicated with the oil outlet of the first hydraulic oil tank 1 through the main pump 8, and a first switch valve 12 can be connected between the accumulator 5 and the main pump 8 in series.
The first on-off valve 12 may be manually controlled.
when the accumulator 5 is replenished with oil, the first switching valve 12 may be opened, and then oil may be supplied to the accumulator 5 through the main pump 8.
When the accumulator 5 is replenished with the oil, the first proportional valve 4 may be closed.
Optionally, referring to fig. 10, the system further includes a first check valve 13, the first check valve 13 is connected in series between the accumulator 5 and the main pump 8, and a direction of the first check valve 13 is a direction of the main pump 8 flowing to the accumulator 5.
In order to prevent the oil in the accumulator 5 from flowing back into the first hydraulic tank 1 and from being sucked empty, a first non-return valve 13 may be provided between the accumulator 5 and the main pump 8, in the direction from the main pump 8 to the accumulator 5.
Optionally, referring to fig. 11, the system further comprises a second on-off valve 14 in series with the accumulator 5.
In order to facilitate the control and maintenance of the energy accumulator 5, providing the option of energy recovery or not, a second on-off valve 14 can be provided in series with the energy accumulator 5.
wherein the second on-off valve 14 can be opened or closed by manual control.
Optionally, referring to fig. 12, the system further includes a second check valve 15, an oil inlet of the second check valve 15 is communicated with the first hydraulic oil tank 1, and an oil outlet of the second check valve 15 is disposed between the rodless cavity 71 of the three-cavity hydraulic oil cylinder 7 and the working end of the first proportional valve 4.
In order to avoid the problem that the oil circuit of the excavator boom hydraulic control system may be vacuumized, that is, in order to prevent suction, a second check valve 15 may be disposed between the rodless cavity 71 of the three-cavity hydraulic cylinder 7 and the working end of the first proportional valve 4, so as to ensure that the oil of the first hydraulic oil tank 1 may enter the oil circuit of the excavator boom hydraulic control system when the pressure of the oil circuit is too small.
It should be noted that the oil inlet of the second check valve 15 may be connected with the oil outlet or the oil inlet of the first hydraulic oil tank 1.
Optionally, the system further comprises a pressure gauge, which may be arranged at any position of the oil circuit of the system, for example, between the accumulator 5 and the main pump 8.
The disclosure also provides an excavator, which comprises the excavator boom hydraulic control system as any one of the excavator boom hydraulic control systems.
The technical effect of the excavator can be the same as that of the excavator movable arm hydraulic control system, and the description is omitted here.
it is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. an excavator boom hydraulic control system, the system comprising: the hydraulic excavator comprises a first hydraulic oil tank, an operating handle, a reversing valve, a first proportional valve, an energy accumulator, a second hydraulic oil tank and a three-cavity hydraulic oil cylinder for driving a movable arm of the excavator;
the operating handle is communicated with a pilot end of the reversing valve;
The first working end of the reversing valve is used for communicating the first pilot end of the first proportional valve with the operating handle and communicating the second pilot end of the first proportional valve with the second hydraulic oil tank, and the second working end of the reversing valve is used for communicating the first pilot end of the first proportional valve and the second pilot end of the first proportional valve with the second hydraulic oil tank;
One side of the working end of the first proportional valve is communicated with a rodless cavity of the three-cavity hydraulic oil cylinder and a first pilot end of the first proportional valve, and the other side of the working end of the first proportional valve is communicated with the energy accumulator and a second pilot end of the first proportional valve.
2. the system of claim 1, further comprising a main pump and a multiplex valve, said operating handle further communicating with a pilot end of said multiplex valve;
the first working end of the multi-way valve is used for respectively communicating the oil outlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder, the oil inlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder, and the second working end of the multi-way valve is used for respectively communicating the oil outlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder, and the oil inlet of the first hydraulic oil tank with the rod cavity of the three-cavity hydraulic oil cylinder;
The main pump is connected in series between the multi-way valve and the oil outlet of the first hydraulic oil tank.
3. The system of claim 1 or 2, further comprising a second proportional valve, wherein a pilot end of the second proportional valve is communicated with the rod cavity of the three-cavity hydraulic oil cylinder, and a working end of the second proportional valve is respectively communicated with the rodless cavity of the three-cavity hydraulic oil cylinder and the oil inlet of the first hydraulic oil tank.
4. The system of claim 1 or 2, further comprising a relief valve having an oil outlet in communication with an oil inlet of the first hydraulic oil tank, the relief valve having an oil inlet disposed between the rodless chamber of the three-chamber hydraulic cylinder and the working end of the first proportional valve.
5. The system of claim 2, wherein said accumulator is also in communication with an oil outlet of said first hydraulic oil tank through said main pump, said system further comprising a first on-off valve connected in series between said accumulator and said main pump.
6. The system of claim 5, further comprising a first one-way valve connected in series between the accumulator and the main pump, the direction of the first one-way valve being the direction of flow of the main pump to the accumulator.
7. The system of claim 1 or 2, further comprising a second on-off valve in series with the accumulator.
8. The system of claim 1 or 2, further comprising a second one-way valve having an oil inlet in communication with the first hydraulic oil tank and an oil outlet disposed between the rodless chamber of the three-chamber hydraulic cylinder and the working end of the first proportional valve.
9. The system of claim 2, wherein the multiplex valve and the reversing valve are three-position, four-way valves.
10. An excavator, characterized in that the excavator comprises an excavator boom hydraulic control system according to any one of claims 1 to 9.
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| CN201910850065.8A CN110541448B (en) | 2019-09-12 | 2019-09-12 | Excavator movable arm hydraulic control system and excavator |
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| CN201910850065.8A CN110541448B (en) | 2019-09-12 | 2019-09-12 | Excavator movable arm hydraulic control system and excavator |
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| CN111561000A (en) * | 2020-05-26 | 2020-08-21 | 三一重机有限公司 | Hydraulic control circuit, hydraulic circuit control method and engineering machinery |
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| Publication number | Publication date |
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| CN110541448B (en) | 2022-03-01 |
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