CN112012268A - Double-pump confluence hydraulic system and excavator - Google Patents
Double-pump confluence hydraulic system and excavator Download PDFInfo
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- CN112012268A CN112012268A CN201910455104.4A CN201910455104A CN112012268A CN 112012268 A CN112012268 A CN 112012268A CN 201910455104 A CN201910455104 A CN 201910455104A CN 112012268 A CN112012268 A CN 112012268A
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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
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
Abstract
A double-pump confluence hydraulic system relates to the technical field of excavators and comprises a pumping module, a breaking hammer starting module, a main valve and a breaking hammer, wherein the pumping module comprises a first pumping mechanism and a second pumping mechanism; the breaking hammer starting module is communicated with a pilot oil pipeline which is respectively communicated with a flow merging valve and a negative flow signal cut-off valve in a main valve; the breaking hammer is communicated with a breaking hammer oil supply pipeline, the breaking hammer oil supply pipeline is communicated with a first pumping mechanism in the pumping module through a main valve, and the breaking hammer oil supply pipeline is communicated with a second pumping mechanism in the pumping module through a confluence valve. When the double-pump confluence hydraulic system supplies oil to the breaking hammer, the first pumping mechanism supplies oil through the main valve, the second pumping mechanism supplies oil through the confluence valve, the oil does not need to flow through the main valve, and the energy loss of oil is reduced while the oil supply amount is increased through double-pump oil supply.
Description
Technical Field
The invention relates to the field of excavators, in particular to a double-pump confluence hydraulic system and an excavator.
Background
The main working conditions of the excavator are shoveling, hoisting, land leveling and the like, the excavator can carry out crushing operation after the crushing hammer is replaced, and the excavator is applied to working conditions of mining, metallurgy, highway, railway, building and the like.
At present, a part of breaking hammers installed on an excavator adopts single-pump oil supply, and the other part adopts double-pump oil supply. If the breaking hammer adopts single pump oil supply, the breaking hammer of a smaller drill rod can only be configured on the excavator due to the limitation of single pump oil supply, and the oil supply requirement of the breaking hammer of a larger drill rod specification cannot be met. In order to solve the problems, part of the breaking hammers adopt double-pump oil supply, and two pumps in the main pump respectively supply oil to the breaking hammers through main valves, so that the oil supply amount is increased, and the excavator can be provided with the breaking hammers with larger drill rod sizes.
However, in the conventional two-pump oil supply system, the two pumps supply oil to the hammer through the main valve, and when the oil flows through the main valve, the internal pipe of the main valve is complicated, so that the pressure loss is large when the oil flows through the internal pipe of the main valve, the heat generation is large, and the energy waste is large.
Disclosure of Invention
The invention aims to provide a double-pump confluence hydraulic system which supplies oil for double-pump confluence when supplying oil to a breaking hammer, has large oil supply amount, and has small energy loss because one oil path does not pass through a main valve.
Another object of the present invention is to provide an excavator which supplies oil to a hammer in a double pump confluence manner with a large amount of oil supply, wherein one oil path does not pass through a main valve, and thus, energy loss is small.
The embodiment of the invention is realized by the following steps:
a double-pump confluence hydraulic system comprises a pumping module, a breaking hammer starting module, a main valve and a breaking hammer,
the pumping module comprises a first pumping mechanism and a second pumping mechanism, the first pumping mechanism is communicated with the first valve block group of the main valve, and the second pumping mechanism is communicated with the second valve block group of the main valve;
the breaking hammer starting module is communicated with a pilot oil pipeline, the pilot oil pipeline is respectively communicated with a flow-combining valve and a negative flow signal cut-off valve in a main valve, and the breaking hammer starting module is used for opening the pilot oil pipeline, so that the flow-combining valve is opened through pilot oil in the pilot oil pipeline, and the negative flow signal cut-off valve is closed;
the breaking hammer is communicated with a breaking hammer oil supply pipeline, the breaking hammer oil supply pipeline is communicated with a first pumping mechanism in the pumping module through a main valve, and the breaking hammer oil supply pipeline is communicated with a second pumping mechanism in the pumping module through a confluence valve.
In a preferred embodiment of the invention, the pilot oil line is provided with a start control valve, which is located between the main valve and the confluence valve.
In a preferred embodiment of the present invention, an inlet of an oil path in the confluence valve is communicated with an oil path between the second pumping mechanism and the main valve, and an oil inlet of an oil chamber in which a valve core of the confluence valve is located is communicated with the start control valve.
In a preferred embodiment of the present invention, the breaking hammer start module comprises a foot valve and a manual breaking button, and the foot valve and the manual breaking button are communicated with the pilot oil pipeline in parallel.
In a preferred embodiment of the present invention, the pilot oil pipeline is provided with an oil path switching valve, the oil path switching valve is connected to the manual crushing button, and the oil path switching valve is configured to control an oil path to flow to the foot valve or the manual crushing button.
In a preferred embodiment of the present invention, the pumping module is connected to an electromagnetic proportional pressure reducing valve, and the electromagnetic proportional pressure reducing valve is used for controlling a flow rate of the oil output by the pumping module.
In a preferred embodiment of the present invention, the oil supply control system further comprises an input module, wherein the input module is used for inputting a preset oil supply amount, and the input module is connected with the electromagnetic proportional pressure reducing valve through a control module.
In a preferred embodiment of the invention, the excavator further comprises a pressure switch, wherein the pressure switch is used for detecting the pressure in the pilot oil pipeline, and the pressure switch is used for being connected with a control system of the excavator.
An excavator comprises the double-pump confluence hydraulic system according to the technical scheme.
In a preferred embodiment of the invention, the excavator further comprises a control system, and the double-pump confluence hydraulic system is connected with the control system.
The embodiment of the invention has the beneficial effects that:
in the application provides a double pump confluence hydraulic system use, the user switches the system into crushing mode through quartering hammer start module for the quartering hammer fuel feeding. After the breaking hammer starting module is started, a part of pilot oil in the pilot oil pipeline flows to the negative flow signal cut-off valve in the main valve to push a valve core of the negative flow signal cut-off valve to move so as to close the negative flow signal cut-off valve, and after the negative flow signal cut-off valve is closed, the second pumping mechanism stops supplying oil to the second valve block group of the main valve. And the other part of pilot oil in the pilot oil pipeline flows to the confluence valve to push a valve core of the confluence valve to move so as to open the confluence valve, so that the oil liquid of the second pumping mechanism is supplied for the breaking hammer through the confluence valve. In addition, after the breaking hammer starting module is started, the first pumping mechanism supplies oil to the breaking hammer through the main valve, and oil of the first pumping mechanism and oil of the second pumping mechanism flow to the breaking hammer together after converging in the breaking hammer oil supply pipeline so as to supply oil to the breaking hammer.
From the above, when the double-pump confluence hydraulic system provided by the application supplies oil to the breaking hammer, the oil output by the first pumping mechanism and the oil output by the second pumping mechanism are both used for supplying oil to the breaking hammer, so that the oil supply amount is large; and the second pumping mechanism supplies oil to the breaking hammer through the confluence valve, compared with a main valve, the confluence valve has a simple internal pipeline structure, the oil has short flowing distance in the confluence valve, the energy loss is small, and the pressure loss is small.
To sum up, use the double pump confluence hydraulic system that this application provided for the quartering hammer fuel feeding, the fuel feeding volume is big, can satisfy the fuel feeding demand of the quartering hammer that has great size drill rod, and energy loss is little.
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 system diagram of a dual pump converging hydraulic system provided by an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the valve of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic diagram of the connections between the pumping module, the confluence valve and the start control valves of FIG. 1;
FIG. 5 is an enlarged view of a portion of the demolition hammer activation module of FIG. 1;
FIG. 6 is a schematic diagram illustrating the flow direction of oil in the excavating mode of the dual-pump converging hydraulic system according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of the flow of oil in the breaking hammer mode of the dual pump converging hydraulic system of the present invention;
FIG. 8 is a schematic diagram of the flow direction of the pilot oil and the first pumping mechanism of the dual-pump converging hydraulic system of the embodiment of the invention in the quartering hammer mode;
fig. 9 is a schematic diagram illustrating the flow direction of the pilot oil and the second pumping mechanism in the breaking hammer mode of the dual-pump confluence hydraulic system according to the embodiment of the present invention.
In the figure:
10-a main valve; 21-a foot valve; 22-manual break button;
30-a breaking hammer; 40-a flow-combining valve; 51-a first pumping mechanism;
52-a second pumping mechanism; 61-oil passage switching valve; 62-starting the control valve;
63-a pressure switch; 64-electromagnetic proportional pressure reducing 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 the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the product of the present invention is conventionally placed when in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred dual-pump combined flow hydraulic system or element 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", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but 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.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
Referring to fig. 1 to 5, the present embodiment provides a dual-pump converging hydraulic system, which includes a pumping module, a breaking hammer starting module, a main valve 10 and a breaking hammer 30, wherein:
the pumping module comprises a first pumping mechanism 51 and a second pumping mechanism 52, the main valve 10 comprises a first valve block set and a second valve block set, the first pumping mechanism 51 is communicated with the first valve block set of the main valve 10, and the second pumping mechanism 52 is communicated with the second valve block set of the main valve 10; in fig. 1, the first valve block set is a left row of valve blocks of the main valve 10, and the second valve block set is a right row of valve blocks of the main valve 10. Each valve block in the main valve 10 is used to communicate with a plurality of different mechanisms in the excavator to supply oil to the plurality of mechanisms in the excavator.
The breaking hammer starting module is communicated with a pilot oil pipeline, the pilot oil pipeline is respectively communicated with the confluence valve 40 and the negative flow signal cut-off valve in the main valve 10, the breaking hammer starting module is used for opening the pilot oil pipeline so as to open the confluence valve 40 through pilot oil in the pilot oil pipeline, as shown in fig. 3, the pilot oil flows into the main valve 10 through a control oil port 4pc2 of the main valve 10, and the negative flow signal cut-off valve is closed.
The breaking hammer 30 communicates with a breaking hammer supply line which communicates with a first pumping mechanism 51 in the pumping module via the main valve 10, and with a second pumping mechanism 52 in the pumping module via the confluence valve 40.
The dual-pump confluence hydraulic system provided in the present embodiment can be applied to an excavator, and when the dual-pump confluence hydraulic system provided in the present embodiment is applied to an excavator, the dual-pump confluence hydraulic system can be used to operate in an excavation mode and also can be used to operate in a crushing mode.
When the excavator is in the excavating mode, the first pumping mechanism 51 in the pumping module is used to supply oil to the first valve block group in the main valve 10 to supply oil to the mechanism in the excavator which is in communication with the valve blocks in the first valve block group; the second pumping mechanism 52 in the pumping module is used to supply oil to the second set of valve blocks in the main valve 10 to supply oil to the mechanisms in the excavator that are in communication with the valve blocks in the second set of valve blocks. Specifically, the first pumping mechanism 51 and the second pumping mechanism 52 may perform the oil supply operation alone or may perform the oil supply operation alone.
When the first pumping mechanism 51 and the second pumping mechanism 52 supply oil to the main valve 10 at the same time, the oil path is as shown in fig. 6.
When the excavator is in the crushing mode, as shown in fig. 7, the crushing hammer start module is started, so that the pilot oil in the pilot oil pipeline flows out of the crushing hammer start module, specifically, a part of the pilot oil in the pilot oil pipeline flows to the negative flow signal cut-off valve in the main valve 10, the spool of the negative flow signal cut-off valve is pushed to move to close the negative flow signal cut-off valve, and after the negative flow signal cut-off valve is closed, the second pumping mechanism 52 stops supplying oil to the second valve block group of the main valve 10. Another part of the pilot oil in the pilot oil pipeline flows to the confluence valve 40, and pushes a valve core of the confluence valve 40 to move so as to open the confluence valve 40, so that the oil liquid of the second pumping mechanism 52 supplies oil to the breaking hammer 30 through the confluence valve 40.
When the crushing hammer oil supply pipeline is specifically implemented, the pilot oil pipeline comprises a pilot oil main pipeline, a first pilot oil branch pipeline and a second pilot oil branch pipeline which are respectively communicated with the pilot oil main pipeline, and the crushing hammer oil supply pipeline comprises a crushing oil supply main pipeline, and a first crushing oil supply branch pipeline and a second crushing oil supply branch pipeline which are respectively communicated with the crushing oil supply main pipeline.
After the breaking hammer starting module is started, the pilot oil flows into the first pilot oil branch pipeline and the second pilot oil branch pipeline through the pilot oil main pipeline, as shown in fig. 8, the pilot oil flowing into the first pilot oil branch pipeline enters the main valve 10, and specifically enters the negative flow signal cut-off valve in the main valve 10 from the control oil port of the main valve 10 to push the spool of the negative flow signal cut-off valve to move, so that the negative flow signal cut-off valve is switched to the open position, and the second pumping mechanism 52 is stopped to supply oil to the second valve block group of the main valve 10. At the same time, the main valve 10 controls the first pumping mechanism 51 to supply oil to the first crushing oil supply branch line.
As shown in fig. 9, the pilot oil flowing into the second pilot oil branch line flows to the confluence valve 40 to push the valve core of the confluence valve 40 to move so that the confluence valve 40 opens a passage between the second pumping mechanism 52 and the second crushing oil branch line so that the oil outputted from the second pumping mechanism 52 can flow into the second crushing oil branch line.
As shown in fig. 7, the oil output from the first pumping mechanism 51 enters the first branch crushing oil supply line, the oil output from the second pumping mechanism 52 enters the second branch crushing oil supply line, and the oil in the first branch crushing oil supply line and the oil in the second branch crushing oil supply line join together in the main crushing oil supply line and then flow together to the hammer 30 to supply oil to the hammer 30.
In a preferred implementation of the embodiment of the invention the pilot oil line is provided with a start control valve 62, the start control valve 62 being located between the main valve 10 and the confluence valve 40. In use, the user first actuates the control valve 62 and then the demolition hammer actuation module, and the dual pump converging hydraulic system switches to a demolition mode. In addition to the above-described actuation manner, after the actuation control valve 62 is actuated, oil may be supplied to the actuation control valve 62 through the main valve 10, and the oil flows into the confluence valve through the actuation control valve 62 to actuate the confluence valve.
Further, as shown in fig. 1 and 4, in a preferred embodiment of the present embodiment, an oil path and an oil chamber are provided in the confluence valve 40, and the valve core is located in the oil chamber and can move to or away from the passage along the oil chamber to block or communicate the passage.
In an alternative embodiment, the inlet of the oil path in the confluence valve 40 is communicated with the oil path between the second pumping mechanism 52 and the main valve 10, and the oil inlet of the oil chamber where the valve core of the confluence valve 40 is located is communicated with the start control valve 62, so that the pilot oil flows into the oil chamber of the confluence valve 40 through the start control valve 62, thereby pushing the valve core to move, so that the oil path in the confluence valve 40 is communicated, and the oil output by the second pumping mechanism 52 can flow into the crushing oil supply line through the oil path of the confluence valve 40.
As shown in fig. 1 and 5, in one possible implementation of the present embodiment, the breaking hammer starting module includes a foot valve and a manual breaking button 22, and the foot valve and the manual breaking button 22 are communicated with the pilot oil line in parallel. With such an arrangement, during use, a user can select to start the crushing starting module by pressing the manual crushing button 22 or select to start the crushing hammer starting module by stepping on the foot valve 21.
Specifically, in an alternative embodiment, the pilot oil line is provided with an oil path switching valve 61, the oil path switching valve 61 is connected with the manual crushing button 22, and the oil path switching valve 61 is used for controlling the oil path to flow to the foot valve or the manual crushing button 22. In a specific application, if the user presses the manual crushing button 22, the manual crushing button 22 transmits a signal to the oil path switching valve 61, and the oil path switching valve 61 switches the internal oil path thereof, so that the pilot oil flows to the manual crushing button 22 through the oil path switching valve 61, flows out of the crushing start module through the manual crushing button 22, and flows to the main valve 10 or the confluence valve 40 through the pilot oil pipeline. When the manual crushing button 22 does not transmit a signal to the oil path switching valve 61, the oil path in the oil path switching valve 61 is in an initial state in which the pilot oil flows to the foot valve 21, and when the user steps on the foot valve 21, the oil path of the foot valve 21 is conducted, so that the pilot oil flowing to the foot valve 21 flows out of the crushing start module through the oil path of the foot valve 21 and flows to the main valve 10 or the confluence valve 40 through the pilot oil line.
In order to facilitate the control of the oil output by the pumping module, in a preferred embodiment, an electromagnetic proportional pressure reducing valve 64 is connected to the pumping module, and the electromagnetic proportional pressure reducing valve 64 is used for controlling the oil output by the pumping module. The electromagnetic proportional pressure reducing valve 64 can be connected with a control system of the excavator so as to operate under the control of the control system of the excavator, and the flow of the oil output by the pumping module can be adjusted according to the specific working condition of the excavator. Specifically, the electromagnetic proportional pressure reducing valve 64 is respectively connected to the first pumping mechanism 51 and the second pumping mechanism 52, and can simultaneously adjust the flow rates of the oil output by the first pumping mechanism 51 and the second pumping mechanism 52, or independently adjust the flow rates of the oil output by the first pumping mechanism 51 or the second pumping mechanism 52.
Or, the double-pump confluence hydraulic system further comprises an input module, the input module is used for inputting a preset oil supply amount, and the input module is connected with the electromagnetic proportional pressure reducing valve 64 through the control module. So set up, the user can change the flow of the fluid of pumping module output according to the demand, the user only need with numerical value via input module input can, input module will be about to input information conversion and export control module, by control module control electromagnetism proportional pressure relief valve 64 to change the flow of the fluid of pumping module output.
In a preferred embodiment of the present embodiment, as shown in fig. 1, the dual-pump confluence hydraulic system further comprises a pressure switch 63, wherein the pressure switch 63 is used for detecting the pressure in the pilot oil pipeline, and the pressure switch 63 is used for connecting with the control system of the excavator. The pressure switch 63 detects the pressure in the pilot oil pipeline and transmits information to the control system, the control system judges whether the breaking hammer starting module is started or not according to the information fed back by the pressure switch 63, if the breaking hammer starting module is started, the control system switches the excavator to a breaking mode, and if the breaking hammer starting module is not started, the control system controls the excavator to be in an excavating mode.
In summary, the dual-pump confluence hydraulic system provided by the embodiment has the following advantages:
because the electromagnetic proportional pressure reducing valve 64 is arranged in the double-pump confluence hydraulic system, the electromagnetic proportional pressure reducing valve 64 is used for adjusting the output flow of the pumping module in a crushing mode, when a user needs to adjust the striking frequency of the breaking hammer 30, the output flow of the pumping module can be set through the input module, so that the accurate adjustment of the flow of the double pumps can be realized, the requirement of the user on the accurate adjustment of the striking frequency of the breaking hammer 30 under different working conditions or during temperature change is met, the engine always works in a predesigned economic oil consumption rotating speed interval, the load rate of the engine is low, the reliability of the engine and the reliability of a hydraulic pump are relatively improved, and the oil consumption of the whole machine is greatly.
Due to the fact that the pressure switch 63 is arranged, the excavator with the double-pump confluence hydraulic system can achieve automatic switching between a crushing mode and an excavator mode under the control of the control system, the engine of the excavator works at a low rotating speed in the crushing mode, when the position of the excavator needs to be adjusted or the crushing hammer 30 needs to be adjusted to be aligned with a crushing object, the mode is switched to the excavator mode, the engine works at a high rotating speed, and the working requirement of the excavator mode is met.
Second embodiment
The present embodiment provides an excavator including the dual-pump confluence hydraulic system provided in the first embodiment described above.
Further, in the excavator provided by this embodiment, further include a control system, the control system is connected with the double-pump confluence hydraulic system.
Specifically, the control system is connected with a pressure switch in the double-pump confluence hydraulic system, and the pressure in the pilot oil pipeline is detected through the pressure switch, so that whether the pilot oil pipeline is communicated or not is judged, and whether the breaking hammer starting module is started or not is judged. When the breaking hammer starting module is started, the control system switches the excavator into a breaking mode, and when the breaking hammer starting module is not started, the control system switches the excavator into an excavating mode. Specifically, in the crushing mode, the control system controls an engine in the excavator to work at a low rotating speed; in the excavation mode, the control system controls an engine in the excavator to work at a higher rotation speed to meet the needs of the excavation mode. So set up for the excavator reduces engine load rate when satisfying broken demand, and the reliability of engine and pumping module all improves to some extent.
Further, the control system can be connected with a control module in the double-pump confluence hydraulic system so as to adjust the flow output by the pumping module by controlling the electromagnetic proportional pressure reducing valve. For example, the control system can accurately adjust the striking frequency of the breaking hammer according to the working condition of the excavator or according to the external temperature (namely according to the external temperature change) detected by the temperature detection mechanism on the excavator, so as to reduce the oil consumption while meeting the working requirement of the excavator.
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 (10)
1. A double-pump confluence hydraulic system is characterized by comprising a pumping module, a breaking hammer starting module, a main valve and a breaking hammer,
the pumping module comprises a first pumping mechanism and a second pumping mechanism, the first pumping mechanism is communicated with the first valve block group of the main valve, and the second pumping mechanism is communicated with the second valve block group of the main valve;
the breaking hammer starting module is communicated with a pilot oil pipeline, the pilot oil pipeline is respectively communicated with a flow-combining valve and a negative flow signal cut-off valve in a main valve, and the breaking hammer starting module is used for opening the pilot oil pipeline, so that the flow-combining valve is opened through pilot oil in the pilot oil pipeline, and the negative flow signal cut-off valve is closed;
the breaking hammer is communicated with a breaking hammer oil supply pipeline, the breaking hammer oil supply pipeline is communicated with a first pumping mechanism in the pumping module through a main valve, and the breaking hammer oil supply pipeline is communicated with a second pumping mechanism in the pumping module through a confluence valve.
2. The dual-pump converging hydraulic system of claim 1, wherein the pilot oil line is provided with a start control valve located between the main valve and the converging valve.
3. The dual-pump confluence hydraulic system of claim 2, wherein an inlet of an oil path in the confluence valve is in communication with an oil path between the second pumping mechanism and the main valve, and an oil inlet of an oil chamber in which a spool of the confluence valve is located is in communication with the start control valve.
4. The dual pump converging hydraulic system of claim 1 wherein the breaking hammer activation module comprises a foot valve and a manual break button, the foot valve and the manual break button in parallel communication with the pilot oil line.
5. The dual-pump confluence hydraulic system of claim 4, wherein the pilot oil line is provided with an oil path switching valve connected to the manual breaker button for controlling the flow of oil to the foot valve or the manual breaker button.
6. The dual-pump converging hydraulic system of claim 1, wherein an electromagnetic proportional pressure reducing valve is connected to the pumping module and is configured to control the flow of oil output by the pumping module.
7. The dual-pump converging hydraulic system of claim 6, further comprising an input module for inputting a preset oil supply, wherein the input module is connected to the electromagnetic proportional pressure reducing valve through a control module.
8. The dual pump converging hydraulic system of claim 1 further comprising a pressure switch for sensing pressure in the pilot oil line, the pressure switch for connection to a control system of an excavator.
9. An excavator comprising a dual pump converging hydraulic system as claimed in any one of claims 1 to 8.
10. The excavation machine of claim 9, further comprising a control system, wherein the dual pump converging hydraulic system is coupled to the control system.
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| EP2256351A2 (en) * | 2009-05-22 | 2010-12-01 | Volvo Construction Equipment Holding Sweden AB | Hydraulic system with improved complex operation |
| KR20100130034A (en) * | 2009-06-02 | 2010-12-10 | 볼보 컨스트럭션 이큅먼트 에이비 | Excavator with hammer device |
| CN203096806U (en) * | 2013-03-16 | 2013-07-31 | 常德市鼎城区升湘机械有限责任公司 | Excavator breaking hammer control device |
| CN103526796A (en) * | 2013-09-25 | 2014-01-22 | 中外合资沃得重工（中国）有限公司 | Excavator breaking hammer hydraulic motor flow control device |
| CN204491710U (en) * | 2015-03-12 | 2015-07-22 | 西安科技大学 | A kind of mini-excavator Dual-pump flow-converging hydraulic circuit |
| CN105317067A (en) * | 2015-11-30 | 2016-02-10 | 周驰军 | Double-pump valve outside flow-converging system suitable for breaking hammer of excavator |
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| Publication number | Publication date |
|---|---|
| CN112012268B (en) | 2023-02-28 |
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