CN111980103B - Excavator hydraulic system and breaking hammer operation mode switching method - Google Patents
Excavator hydraulic system and breaking hammer operation mode switching method Download PDFInfo
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- CN111980103B CN111980103B CN201910432588.0A CN201910432588A CN111980103B CN 111980103 B CN111980103 B CN 111980103B CN 201910432588 A CN201910432588 A CN 201910432588A CN 111980103 B CN111980103 B CN 111980103B
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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
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- 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
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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
- E02F9/2267—Valves or distributors
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- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to the technical field of excavators, in particular to an excavator hydraulic system and a breaking hammer operation mode switching method. The hydraulic system of the excavator comprises a hydraulic pump assembly, an actuating mechanism and a controller, wherein the hydraulic pump assembly is communicated with the actuating mechanism, and the controller is provided with an auxiliary operation mode and a non-auxiliary operation mode; when the controller is in an auxiliary operation mode, the controller can enable the hydraulic pump assembly to be in a communication state with the actuating mechanism so that the hydraulic pump assembly can input hydraulic oil to the actuating mechanism; the controller disconnects the hydraulic pump assembly from the actuator when the controller is in a non-assist mode of operation. The invention can effectively control the oil consumption of the excavator in the auxiliary operation mode.
Description
Technical Field
The invention relates to the technical field of excavators, in particular to an excavator hydraulic system and a breaking hammer operation mode switching method.
Background
At present, when some excavator operators use a breaking hammer on an excavator to carry out breaking operation in places such as mines or stone yards, a preset 'breaking mode' in a control system is not selected usually, but the operation is directly selected under an 'H-heavy load mode', and because the control mode of an engine is constant rotating speed control, in order to ensure that the rotating speed of the engine is not reduced and the power output is ensured, a system program controller enables the engine to continuously increase the fuel injection quantity, and the whole excavator is in a high fuel consumption running state, so that the condition that the fuel consumption of the excavator is higher is caused.
Disclosure of Invention
The invention aims to provide an excavator hydraulic system and a breaking hammer operation mode switching method, and aims to solve the technical problem that an excavator operator does not select a preset breaking mode in a control system but directly selects to operate in an H-heavy load mode to cause high oil consumption of the excavator to a certain extent.
The invention provides an excavator hydraulic system, which comprises a hydraulic pump assembly, an actuating mechanism and a controller, wherein the hydraulic pump assembly is communicated with the actuating mechanism;
when the controller is in an auxiliary operation mode, the controller can enable the hydraulic pump assembly to be in a communication state with the actuating mechanism so that the hydraulic pump assembly can input hydraulic oil to the actuating mechanism; the controller disconnects the hydraulic pump assembly from the actuator when the controller is in a non-assist mode of operation.
Further, the system also comprises a pilot control device and a multi-way valve assembly; the hydraulic pump assembly is also communicated with the pilot control device, and the hydraulic pump assembly is communicated with the actuating mechanism through the multi-way valve assembly; the pilot control device is used for controlling the main valve core of the multi-way valve assembly to change direction.
Further, the pilot control device comprises a first electromagnetic valve, a pilot control foot valve and at least one pilot oil source valve; the pilot oil source valve is communicated with the hydraulic pump assembly, the pilot oil source valve is communicated with the pilot control foot valve through a first electromagnetic valve, the pilot control foot valve is used for enabling a main valve core of the multi-way valve assembly to be capable of reversing, and the controller is used for controlling whether the first electromagnetic valve is electrified or not.
Further, the hydraulic pump assembly comprises a plunger pump and a pilot gear pump; the plunger pump is used for providing hydraulic oil for the multi-way valve assembly; the pilot gear pump is used for providing pilot pressure oil for the pilot control device.
Furthermore, the hydraulic pump assembly further comprises an overflow valve, and the pilot gear pump is communicated with the pilot control device through the overflow valve.
Further, the actuating mechanism is a breaking hammer.
Further, the filter further comprises an auxiliary filter assembly and a first bypass valve; and the breaking hammer is respectively communicated with an oil inlet of the auxiliary filter assembly and an oil inlet of the first bypass valve.
Further, the auxiliary filter assembly further comprises a hydraulic oil radiator, and an oil outlet of the auxiliary filter assembly and an oil outlet of the first bypass valve are respectively communicated with an oil inlet of the hydraulic oil radiator.
Further, still include hydraulic tank, the hydraulic pump assembly with hydraulic tank communicates.
The invention also provides a method for switching the operation modes of the breaking hammer, which comprises the following steps:
be linked together hydraulic pump assembly and quartering hammer to adopt the controller control hydraulic pump assembly and the break-make state between the quartering hammer, wherein:
when the controller is in an auxiliary operation mode, the controller enables the hydraulic pump assembly and the breaking hammer to be in a communication state, so that the hydraulic pump assembly can input hydraulic oil to the breaking hammer; the controller disconnects the hydraulic pump assembly from the demolition hammer when the controller is in a non-assisted mode of operation.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an excavator hydraulic system and a breaking hammer operation mode switching method, wherein a hydraulic pump assembly and a breaking hammer can be in a communication state only when a controller is in an auxiliary operation mode (such as a breaking mode), so that the hydraulic pump assembly can input hydraulic oil to an actuating mechanism (such as the breaking hammer), and the actuating mechanism can operate, therefore, an operator is forced to switch the operation mode of the controller, namely, the actuating mechanism can operate only when the controller is switched to the auxiliary operation mode, and the oil consumption of the excavator in the auxiliary operation mode is effectively controlled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an excavator hydraulic system provided by an embodiment of the invention;
fig. 2 is an electrical control schematic diagram of a two-position three-way electromagnetic valve in an excavator hydraulic system according to an embodiment of the invention.
Icon:
101-an engine; 102-a plunger pump; 103-pilot gear pump; 104-an overflow valve; 105-a pilot oil supply valve; 106-pilot control foot valve; 107-two-position three-way solenoid valve; 108-a multiplex valve assembly; 109-a first stop valve; 110-breaking hammer; 111-an auxiliary filter assembly; 112-a first bypass valve; 113-back pressure valve; 114-hydraulic oil radiator; 115-hydraulic oil tank; 116-a second shut-off valve; 117-a second bypass valve; 118-bridge plate switches; 119-engine controller.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
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, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, 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 and 2, an embodiment of the present invention provides a hydraulic system of an excavator, which includes a hydraulic pump assembly, an actuator, and a controller, wherein the hydraulic pump assembly is communicated with the actuator, and the controller has an auxiliary operation mode and a non-auxiliary operation mode; when the controller is in the auxiliary operation mode, the controller can enable the hydraulic pump assembly and the actuating mechanism to be in a communication state, so that the hydraulic pump assembly can input hydraulic oil to the actuating mechanism; the controller disconnects the hydraulic pump assembly from the actuator when the controller is in the non-assist mode.
Specifically, the actuator may be a breaking hammer 110; the auxiliary operating mode may be crushing mode B, i.e. the operation mode of the breaking hammer 110; while the non-auxiliary work modes may include a heavy load mode H, a standard mode S, and a light load mode L. The selection of the operating mode of the controller is a manual selection by the operator.
In an optional scheme of this embodiment, the excavator hydraulic system further includes a hydraulic oil tank 115, and the hydraulic pump assembly is communicated with the hydraulic oil tank 115. The hydraulic pump assembly supplies hydraulic oil in a hydraulic oil tank 115 to the breaking hammer 110 to cause the breaking hammer 110 to perform work.
In an optional scheme of the embodiment, the excavator hydraulic system further comprises a pilot control device and a multi-way valve assembly 108; the hydraulic pump assembly is also communicated with a pilot control device, and the hydraulic pump assembly is communicated with the actuating mechanism through a multi-way valve assembly 108; the pilot control device is used for controlling the main spool of the multi-way valve assembly 108 to change direction. Through the pilot control device and the multi-way valve assembly 108, the control of the actuating mechanism (namely, the breaking hammer 110) is realized by matching the controller.
Specifically, the hydraulic oil in the hydraulic oil tank 115 is supplied as pilot pressure oil to the pilot control device through the hydraulic pump assembly. The hydraulic pump assembly is communicated with the multi-way valve assembly 108, and the multi-way valve assembly 108 is communicated with the actuating mechanism, so that the oil circuit switching of the multi-way valve assembly 108 is controlled by the pilot control device, and the on-off of the oil circuit between the hydraulic pump assembly and the actuating mechanism is realized.
In an alternative solution of this embodiment, the pilot control device comprises a first solenoid valve, a pilot-controlled foot valve 106 and at least one pilot oil source valve 105; the pilot oil source valve 105 is communicated with the hydraulic pump assembly, the pilot oil source valve 105 is communicated with the pilot control foot valve 106 through a first electromagnetic valve, the pilot control foot valve 106 is used for enabling a main valve core of the multi-way valve assembly 108 to be capable of reversing so as to achieve oil circuit switching of the multi-way valve assembly 108, and the controller is used for controlling whether the first electromagnetic valve is electrified or not.
Specifically, the number of the pilot oil source valves 105 may be one, the pilot oil source valves 105 have 3 hydraulic branch oil paths, the 3 hydraulic branch oil paths are respectively controlled to be on and off by electromagnetic valves on valve bodies of the pilot oil source valves 105, and one of the hydraulic branch oil paths respectively supplies oil to the pilot handle, the pilot walking foot valve and the first electromagnetic valve; the other two hydraulic branch oil paths supply oil to the walking double-speed mechanism and the excavating force-increasing mechanism respectively. The first solenoid valve may be a two-position, three-way solenoid valve 107. An inlet P of the two-position three-way solenoid valve 107 is communicated with the pilot oil source valve 105, an outlet a1 of the two-position three-way solenoid valve 107 is communicated with an inlet P of the pilot control foot valve 106, and a discharge port T of the two-position three-way solenoid valve 107 and a discharge port T of the pilot control foot valve 106 are respectively communicated with the hydraulic oil tank 115. When the two-position three-way solenoid valve 107 is not energized, a communication state is formed between the outlet a1 of the two-position three-way solenoid valve 107 and the discharge port T of the two-position three-way solenoid valve 107, so that no pilot pressure oil is output to the pilot-controlled foot valve 106; when the two-position three-way solenoid valve 107 is energized, the outlet a1 of the two-position three-way solenoid valve 107 and the inlet P of the two-position three-way solenoid valve 107 are in a communication state, so that the outlet a1 of the two-position three-way solenoid valve 107 outputs pilot pressure oil to the pilot control foot valve 106, and at this time, an operator can realize the reversing of the main spool of the multi-way valve assembly 108 by controlling the pilot control foot valve 106, so as to realize that the hydraulic pump assembly supplies hydraulic oil to the breaking hammer 110.
In an alternative scheme of the embodiment, the hydraulic pump assembly comprises a plunger pump 102 and a pilot gear pump 103; the plunger pump 102 and the pilot gear pump 103 are respectively communicated with a hydraulic oil tank 115; the plunger pump 102 is used for providing hydraulic oil to the multi-way valve assembly 108; the pilot gear pump 103 is used for a pilot control device to supply pilot pressure oil.
Specifically, the plunger pump 102 is also used to provide a source of oil to the engine 101. After passing through the pilot oil source valve 105, the pilot pressure oil provided by the pilot gear pump 103 flows to the two-position three-way solenoid valve 107 through the pilot oil source valve 105, and then flows to the multi-way valve assembly 108 through the pilot control foot valve 106, so as to control the main spool of the multi-way valve assembly 108, and thus, the oil circuit switching in the multi-way valve assembly 108 is realized.
In an optional scheme of the embodiment, the hydraulic pump assembly further includes an overflow valve 104, and the pilot gear pump 103 is communicated with the pilot control device through the overflow valve 104.
In an optional scheme of the embodiment, the excavator hydraulic system further comprises an auxiliary filter assembly 111 and a first bypass valve 112; the breaking hammer 110 is respectively communicated with an oil inlet of the auxiliary filter assembly 111 and an oil inlet of the first bypass valve 112.
In an optional scheme of this embodiment, the excavator hydraulic system further includes a hydraulic oil radiator 114, and an oil outlet of the auxiliary filter assembly 111 and an oil outlet of the first bypass valve 112 are respectively communicated with an oil inlet of the hydraulic oil radiator 114.
Specifically, the excavator hydraulic system further includes a first shutoff valve 109, a second shutoff valve 116, a second bypass valve 117, and a back pressure valve 113; the inlet of the first stop valve 109 communicates with the multiplex valve assembly 108; an outlet of the first stop valve 109 is communicated with an oil inlet of the breaking hammer 110, an oil outlet of the breaking hammer 110 is communicated with an inlet of the second stop valve 116, and an outlet of the second stop valve 116 is respectively communicated with an oil inlet of the auxiliary filter assembly 111 and an oil inlet of the first bypass valve 112; the back pressure valve 113 and the hydraulic oil radiator 114 are connected in series and then connected in parallel with the second bypass valve 117; an oil outlet of the auxiliary filter assembly 111 is respectively communicated with an oil inlet of the second bypass valve 117 and an inlet of the back pressure valve 113; the oil outlet of the first bypass valve 112 is respectively communicated with the oil inlet of the second bypass valve 117 and the inlet of the backpressure valve 113; an outlet of the second bypass valve 117 is communicated with the hydraulic oil tank 115, and an oil outlet of the hydraulic oil radiator 114 is communicated with the hydraulic oil tank 115.
In an alternative scheme of this embodiment, the controller may be an engine controller 119(ECU), the excavator hydraulic system may further include a bridge plate switch 118, and the bridge plate switch 118 is electrically connected to the two-position three-way solenoid valve 107 after being connected in parallel with the controller, so that whether the two-position three-way solenoid valve 107 is powered or not may be controlled by the bridge plate switch 118, and whether the two-position three-way solenoid valve 107 is powered or not may be controlled by the engine controller 119. When the crush initiation side on the bridge plate switch 118 is depressed, the two-position, three-way solenoid valve 107 is energized.
Referring to fig. 1 and 2, the embodiment of the invention further provides a method for switching the operation mode of the breaking hammer 110, wherein the method for switching the operation mode adopts the hydraulic system of the excavator; the method includes communicating a hydraulic pump assembly with the demolition hammer 110 and controlling an on-off state between the hydraulic pump assembly and the demolition hammer 110 with a controller.
When the controller is in the auxiliary operation mode, the controller can enable the hydraulic pump assembly to be in a communication state with the breaking hammer 110, so that the hydraulic pump assembly can input hydraulic oil to the breaking hammer 110; specifically, the hydraulic pump assembly provides pilot pressure oil to the pilot oil source valve 105, the pilot pressure oil flows to the two-position three-way solenoid valve 107 through the pilot oil source valve 105, when an operator selects an auxiliary operation mode, the controller is in the auxiliary operation mode, the two-position three-way solenoid valve 107 is in an energized state, an outlet a1 of the two-position three-way solenoid valve 107 and an inlet P of the two-position three-way solenoid valve 107 form a passage state, so that the outlet a1 of the two-position three-way solenoid valve 107 outputs the pilot pressure oil to the pilot control foot valve 106, and the operator controls the pilot control foot valve 106 to enable the pilot pressure oil to flow to the multi-way valve assembly 108 through the pilot control foot valve 106, so as to achieve the reversing of the main spool of the multi-way valve assembly 108, and enable the hydraulic pump assembly to provide hydraulic oil to the hammer 110, thereby achieving the operation of the hammer 110.
When the controller is in the non-auxiliary operating mode, the controller disconnects the hydraulic pump assembly from the demolition hammer 110. Specifically, when the operator selects the non-assist operation mode, that is, the controller is in the non-assist operation mode, at this time, the two-position three-way solenoid valve 107 is not powered, so that the outlet a1 of the two-position three-way solenoid valve 107 and the discharge port T of the two-position three-way solenoid valve 107 are in a communication state, and thus no pilot pressure oil is output to the pilot control foot valve 106, in this case, since no pilot pressure oil enters the pilot control foot valve 106, the operator controls the pilot control foot valve at this time and does not work, that is, the pilot pressure oil cannot flow to the multi-way valve assembly 108 through the pilot control foot valve 106, and thus the operation of the hammer 110 cannot be realized.
According to the excavator hydraulic system and the operation mode switching method of the breaking hammer 110 provided by the embodiment of the invention, whether the two-position three-way electromagnetic valve 107 obtains an output instruction of the controller or not is mainly determined, only when the controller selects the breaking operation mode, an electric signal is sent to the two-position three-way electromagnetic valve 107, after the two-position three-way electromagnetic valve 107 is electrically switched, pilot pressure oil is communicated to the pilot control foot valve 106, and at the moment, the pilot control foot valve 106 is operated to have an effect. If the controller does not select the crushing operation mode, the two-position three-way solenoid valve 107 will not receive an electric signal, the pilot pressure oil will not be passed to the pilot-controlled foot valve 106, and the operation of the pilot-controlled foot valve 106 will not be effective.
In summary, the excavator hydraulic system and the method for switching the operation mode of the breaking hammer 110 according to the embodiments of the present invention can prevent the excavator operator from forgetting to switch the operation mode. The invention has the following advantages:
1. the control is simple: the pilot control device determines whether the pilot control foot valve 106 is communicated with pilot pressure oil or not through the switching state of the two-position three-way electromagnetic valve 107, whether the two-position three-way electromagnetic valve 107 is electrified or not is determined according to the selection of an operation mode on a controller or the position of a manual bridge plate switch 118 in an emergency state, and the control function principle is simple.
2. Energy conservation and consumption reduction: because the oil way of the pilot pressure oil is forcibly controlled when the crushing operation mode is selected, the preset power of the hydraulic system is set and reduced, and the control instruction sent to the engine controller 119 by the complete machine controller is matched, the engine is not operated in a high-load state any more during the crushing operation, and the fuel consumption of the engine 101 is effectively controlled.
3. Economic and reliable: in the hydraulic system design of forced implementation of the crushing mode, the two-position three-way reversing valve is low in application failure rate, safe and reliable.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The hydraulic system of the excavator is characterized by comprising a hydraulic pump assembly, an actuating mechanism, a controller, a pilot control device and a multi-way valve assembly, wherein the hydraulic pump assembly is communicated with the actuating mechanism, and the controller is provided with an auxiliary operation mode and a non-auxiliary operation mode;
when the controller is in an auxiliary operation mode, the controller can enable the hydraulic pump assembly to be in a communication state with the actuating mechanism so that the hydraulic pump assembly can input hydraulic oil to the actuating mechanism; the controller disconnects the hydraulic pump assembly from the actuator when the controller is in a non-assisted work mode;
the hydraulic pump assembly is also communicated with the pilot control device, and the hydraulic pump assembly is communicated with the actuating mechanism through the multi-way valve assembly; the pilot control device is used for controlling the main valve core of the multi-way valve assembly to change direction;
the pilot control device comprises a first electromagnetic valve, a pilot control foot valve and at least one pilot oil source valve; the pilot oil source valve is communicated with the hydraulic pump assembly, the pilot oil source valve is communicated with the pilot control foot valve through a first electromagnetic valve, the pilot control foot valve is used for enabling a main valve core of the multi-way valve assembly to be capable of reversing, and the controller is used for controlling whether the first electromagnetic valve is electrified or not;
the pilot oil source valve is provided with three hydraulic branch oil paths, and one hydraulic branch oil path respectively supplies oil to the pilot handle, the pilot walking foot valve and the first electromagnetic valve; and the other two hydraulic branch oil paths respectively supply oil to the walking double-speed mechanism and the excavating force-increasing mechanism.
2. The excavator hydraulic system of claim 1 wherein the hydraulic pump assembly includes a plunger pump and a pilot gear pump; the plunger pump is used for providing hydraulic oil for the multi-way valve assembly; the pilot gear pump is used for providing pilot pressure oil for the pilot control device.
3. The excavator hydraulic system of claim 2 wherein the hydraulic pump assembly further comprises an overflow valve through which the pilot gear pump communicates with the pilot control device.
4. The excavator hydraulic system of claim 1 wherein the actuator is a demolition hammer.
5. The excavator hydraulic system of claim 4 further comprising an auxiliary filter assembly and a first bypass valve; and the breaking hammer is respectively communicated with an oil inlet of the auxiliary filter assembly and an oil inlet of the first bypass valve.
6. The excavator hydraulic system of claim 5, further comprising a hydraulic oil radiator, wherein the oil outlet of the auxiliary filter assembly and the oil outlet of the first bypass valve are respectively communicated with an oil inlet of the hydraulic oil radiator.
7. The excavator hydraulic system of claim 1 further comprising a hydraulic oil tank, the hydraulic pump assembly being in communication with the hydraulic oil tank.
8. A method for switching the operation mode of a breaking hammer is characterized by comprising the following steps:
be linked together hydraulic pump assembly and quartering hammer to adopt the controller control hydraulic pump assembly and the break-make state between the quartering hammer, wherein:
when the controller is in an auxiliary operation mode, the controller enables the hydraulic pump assembly and the breaking hammer to be in a communication state, so that the hydraulic pump assembly can input hydraulic oil to the breaking hammer; the controller disconnecting the hydraulic pump assembly from the demolition hammer when the controller is in a non-assisted mode of operation,
the hydraulic pump assembly is also communicated with a pilot control device and is communicated with the actuating mechanism through a multi-way valve assembly; the pilot control device is used for controlling the main valve core of the multi-way valve assembly to change direction;
the pilot control device comprises a first electromagnetic valve, a pilot control foot valve and at least one pilot oil source valve; the pilot oil source valve is communicated with the hydraulic pump assembly, the pilot oil source valve is communicated with the pilot control foot valve through a first electromagnetic valve, the pilot control foot valve is used for enabling a main valve core of the multi-way valve assembly to be capable of reversing, and the controller is used for controlling whether the first electromagnetic valve is electrified or not;
the pilot oil source valve is provided with three hydraulic branch oil paths, and one hydraulic branch oil path respectively supplies oil to the pilot handle, the pilot walking foot valve and the first electromagnetic valve; and the other two hydraulic branch oil paths respectively supply oil to the walking double-speed mechanism and the excavating force-increasing mechanism.
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| CN201910432588.0A CN111980103B (en) | 2019-05-22 | 2019-05-22 | Excavator hydraulic system and breaking hammer operation mode switching method |
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| CN201910432588.0A CN111980103B (en) | 2019-05-22 | 2019-05-22 | Excavator hydraulic system and breaking hammer operation mode switching method |
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| CN113700075A (en) * | 2021-08-12 | 2021-11-26 | 上海三一重机股份有限公司 | Working machine, travel control system, and control method |
| CN114352592B (en) * | 2022-01-24 | 2023-09-22 | 三一重机有限公司 | Hydraulic control system and working machine |
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|---|---|---|---|---|
| JP2003049453A (en) * | 2001-08-07 | 2003-02-21 | Shin Caterpillar Mitsubishi Ltd | Hydraulic circuit of construction machine |
| JP2005036881A (en) * | 2003-07-14 | 2005-02-10 | Shin Caterpillar Mitsubishi Ltd | Oil temperature control method for hydraulic circuit |
| KR20100075299A (en) * | 2008-12-24 | 2010-07-02 | 두산인프라코어 주식회사 | Control system for autometically starting and stoping operation of breaker in excavator |
| CN202689078U (en) * | 2012-06-26 | 2013-01-23 | 合肥振宇工程机械有限公司 | Oil return control mechanism of hydraulic system of excavator |
| CN103174704A (en) * | 2013-03-29 | 2013-06-26 | 中联重科股份有限公司渭南分公司 | Hydraulic oil filtering system and hydraulic excavator |
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2019
- 2019-05-22 CN CN201910432588.0A patent/CN111980103B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003049453A (en) * | 2001-08-07 | 2003-02-21 | Shin Caterpillar Mitsubishi Ltd | Hydraulic circuit of construction machine |
| JP2005036881A (en) * | 2003-07-14 | 2005-02-10 | Shin Caterpillar Mitsubishi Ltd | Oil temperature control method for hydraulic circuit |
| KR20100075299A (en) * | 2008-12-24 | 2010-07-02 | 두산인프라코어 주식회사 | Control system for autometically starting and stoping operation of breaker in excavator |
| CN202689078U (en) * | 2012-06-26 | 2013-01-23 | 合肥振宇工程机械有限公司 | Oil return control mechanism of hydraulic system of excavator |
| CN103174704A (en) * | 2013-03-29 | 2013-06-26 | 中联重科股份有限公司渭南分公司 | Hydraulic oil filtering system and hydraulic excavator |
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