CN111549848A - Hydraulic system and control method of backhoe loader and backhoe loader - Google Patents
Hydraulic system and control method of backhoe loader and backhoe loader Download PDFInfo
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- CN111549848A CN111549848A CN202010418926.8A CN202010418926A CN111549848A CN 111549848 A CN111549848 A CN 111549848A CN 202010418926 A CN202010418926 A CN 202010418926A CN 111549848 A CN111549848 A CN 111549848A
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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
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention relates to the technical field of loaders, in particular to a hydraulic system of a loader-digger, a control method and the loader-digger. The hydraulic system of the loader-digger comprises an engine, a hydraulic pump, a loading end main valve and a digging end main valve; the engine is connected with the loading end main valve and the excavating end main valve through the hydraulic pump, and the output power of the engine and the output torque of the hydraulic pump are adjustable, so that the output power of the hydraulic pump is matched with the output power of the engine. When the excavating device works, the rotating speed of the engine is reduced so as to reduce the output power of the engine; the output torque of the hydraulic pump is improved to maintain the output power of the hydraulic pump unchanged, so that the output power of the hydraulic pump is matched with the output power of the engine, the power utilization rate of the engine is improved, and the oil consumption and the noise of the engine are obviously reduced. When the loading device works, the rotating speed of the engine is increased, so that the engine can output full power; the output torque of the hydraulic pump is reduced, so that the output power of the reactance plunger pump is kept unchanged.
Description
Technical Field
The invention relates to the technical field of loaders, in particular to a hydraulic system of a loader-digger, a control method and the loader-digger.
Background
At present, when the loader-digger works, the rotating speed, the pressure and the flow of a working pump are constant, and the power is also constant, but when a loading end and an excavating end of the loader-digger work respectively, the power utilization rate of an engine has great difference, wherein the power utilization rate of the excavating end is the lowest, so that extremely high fuel consumption is caused.
Disclosure of Invention
The invention aims to provide a hydraulic system and a control method of a loader-digger and the loader-digger, so as to improve the power utilization rate of an engine to a certain extent.
The invention provides a hydraulic system of a loader-digger, which comprises an engine, a hydraulic pump, a loading end main valve and an excavating end main valve, wherein the loading end main valve is arranged on the engine; an oil inlet of the hydraulic pump is connected with an oil tank, and an oil outlet of the hydraulic pump is connected with a loading device and an excavating device through the loading end main valve and the excavating end main valve respectively; the output end of the engine is connected with the input end of the hydraulic pump; the output power of the engine and the output torque of the hydraulic pump are adjustable.
Further, the hydraulic pump is an electrically controlled plunger pump.
Further, the engine has a first output power and a second output power, and the first output power is smaller than the second output power; the electrically controlled plunger pump has a first output torque and a second output torque; the first output torque corresponds to the first output power, and the second output torque corresponds to the second output power; the first output torque is greater than the second output torque.
Further, the device also comprises a control device; the control device is in communication connection with the engine and can control the rotating speed of the engine so as to enable the engine to switch between the first output power and the second output power.
Further, the control device is in communication connection with the electronic control plunger pump; the control device can control the input current of the electrically controlled plunger pump to switch the electrically controlled plunger pump between the first output torque and the second output torque.
Further, the device also comprises a state switch; the state switch is in communication connection with the loading device and the excavating device and is used for switching the working states of the loading device and the excavating device; the change-over switch is in communication connection with the control device.
Further, the displacement of the electric control plunger pump is 5-105L/r.
The invention also provides a hydraulic system control method of the loader-digger, which comprises the following steps:
200, when a loading device is used, increasing the rotating speed of the engine through a control device to increase the output power of the engine to a second output power; and inputting a small current to the electric control plunger pump through a control device, so that the output torque of the electric control plunger pump is reduced to a second output torque.
The invention also provides a backhoe loader comprising the hydraulic system of the backhoe loader.
Further, the device also comprises a walking device, and the walking device is connected with the engine through a gearbox.
Compared with the prior art, the invention has the beneficial effects that:
the hydraulic system of the loader-digger comprises an engine, a hydraulic pump, a loading end main valve and an excavating end main valve; the output end of the engine is connected with the input end of the hydraulic pump, the oil inlet of the hydraulic pump is communicated with the oil tank, and the oil outlet of the hydraulic pump is respectively communicated with the main valve at the excavating end and the main valve at the loading end of the loader-digger, so that hydraulic oil is conveyed to the excavating device and the loading device of the loader-digger through the hydraulic pump to drive the excavating device and the loading device to operate. The output power of the engine is adjustable, and the output torque of the hydraulic pump is adjustable, so that the output power of the hydraulic pump is matched with the output power of the engine.
When the excavating device works, the output power of the engine only needs to meet the consumption of a hydraulic system, and the rotating speed of the engine is reduced so as to reduce the output power of the engine; along with the reduction of the rotating speed of the engine, the output power of the hydraulic pump is reduced, the output torque of the hydraulic pump is improved to maintain the output power of the hydraulic pump unchanged, so that the output power of the hydraulic pump is matched with the output power of the engine, the power utilization rate of the engine is improved, and the oil consumption and the noise of the engine are obviously reduced.
When the loading device works, the output power of the engine needs to meet the consumption of a hydraulic system and the consumption of the whole machine during walking at the same time, the rotating speed of the engine is increased, and the engine is enabled to output full power; and a small current is input into the hydraulic pump to reduce the output torque of the hydraulic pump, so that the output power of the reactance plunger pump is kept unchanged.
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 description of the embodiments or the prior art 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 illustration of a hydraulic system of a backhoe loader provided in accordance with an embodiment of the present invention;
fig. 2 is a flowchart of a hydraulic system control method of the backhoe loader according to the embodiment of the present invention.
Reference numerals:
1-an electric control plunger pump, 2-an engine and 3-a control device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "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.
As used herein, the term "and/or" includes any one of the associated listed items and any combination of any two or more of the items.
For ease of description, spatial relationship terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.
Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.
The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
A hydraulic system of a backhoe loader, a control method, and a backhoe loader according to some embodiments of the present application will be described below with reference to fig. 1 and 2.
The application provides a hydraulic system of a loader-digger, which comprises an engine 2, a hydraulic pump, a loading end main valve and an excavating end main valve, as shown in figure 1; the output end of the engine 2 is connected with the input end of a hydraulic pump, an oil inlet of the hydraulic pump is communicated with an oil tank, and an oil outlet of the hydraulic pump is respectively communicated with a main valve at the excavating end and a main valve at the loading end of the loader-digger, so that hydraulic oil is conveyed to an excavating device and a loading device of the loader-digger through the hydraulic pump to drive the excavating device and the loading device to operate. Wherein the output power of the engine 2 is adjustable while the output torque of the hydraulic pump is adjustable so that the output power of the hydraulic pump matches the output power of the engine 2.
In this embodiment, it is preferable that the engine 2 has a first output power and a second output power, and the first output power is smaller than the second output power. When the loading device of the loader-digger operates, the output power of the engine 2 can meet the consumption of a hydraulic system and the walking consumption of the whole loader, at the moment, the engine 2 is enabled to output full power, and the output power of the engine 2 is larger second output power; when the excavating device of the backhoe loader is operated, the output power of the engine 2 is adjusted to the first output power which is smaller as long as the output power of the engine 2 satisfies the consumption of the hydraulic system.
Preferably, the adjustment of the output power of the engine 2 is achieved by adjusting the rotational speed of the engine 2, the engine 2 also having a first rotational speed and a second rotational speed corresponding to the first output power and the second output power of the engine 2; when the output power of the engine 2 needs to be adjusted to a first smaller output power, the rotating speed of the engine 2 is reduced to a corresponding first rotating speed, and when the engine 2 needs to be output at a second full output power, the rotating speed of the engine 2 is adjusted to a corresponding second rotating speed.
In this embodiment, preferably, the hydraulic pump is a large-displacement electronically controlled plunger pump 1, and the output torque of the electronically controlled plunger pump 1 is adjustable; the electrically controlled plunger pump 1 has a first output torque corresponding to a first output power of the engine 2; the electrically controlled plunger pump 1 has a second output torque corresponding to a second output power of the engine 2; the first output torque is larger than the second output torque, and the output power of the electrically controlled plunger pump 1 is unchanged at the first output torque and the second output torque.
It should be noted that the model number of the large-displacement electric control plunger pump 1 is HP5V105/AV10RC4S3MA-L1/1-E0-D1, and the displacement range is 5-105L/r.
Preferably, the adjustment of the output torque of the electronically controlled plunger pump 1 is achieved by adjusting the input current of the electronically controlled plunger pump 1. When the excavating device works, the output power of the engine 2 only needs to meet the consumption of a hydraulic system, and the rotating speed of the engine 2 is reduced to a first rotating speed so as to reduce the output power of the engine 2 to the first output power; along with the reduction of the rotating speed of the engine 2, the output power of the electronic control plunger pump 1 is reduced, a larger current is input into the electronic control plunger pump 1 at the moment to improve the output torque of the electronic control plunger pump 1 to a first output torque, and the electronic control plunger pump 1 with large displacement is selected, so that the output power of the hydraulic pump can be maintained unchanged, the hydraulic pump can stably provide hydraulic oil for the excavating device to drive the excavating device to stably run, the output power of the electronic control plunger pump 1 is matched with the output power of the engine 2, the power utilization rate of the engine 2 is improved, and the oil consumption and the noise of the engine 2 are obviously reduced.
When the loading device works, the output power of the engine 2 needs to meet the consumption of a hydraulic system and the consumption of the whole machine during walking at the same time, and the rotating speed of the engine 2 is increased to a second rotating speed, so that the engine 2 can output full power at the second output power; due to the adoption of the large-displacement electric control plunger pump 1, if the output torque of the electric control plunger pump 1 is still maintained at a first larger output torque which is the same as that of the excavating device, the output power of the electric control plunger pump 1 is overlarge when the loading device works; at this time, a small current is input into the electrically controlled plunger pump 1 to reduce the output torque of the electrically controlled plunger pump 1, so as to maintain the output power of the reactance plunger pump unchanged.
In this embodiment, preferably, as shown in fig. 1, the hydraulic system of the backhoe loader further includes a control device 3; the control device 3 can be in communication connection with the engine 2 and the electronically controlled plunger pump, respectively. The control device 3 can control the rotation speed of the engine 2, switch the rotation speed of the engine 2 between the first rotation speed and the second rotation speed, and further switch the output of the engine 2 between the first output and the second output. Different currents can be supplied to the electronically controlled plunger pump 1 by the control device 3, so that the output torque of the electronically controlled plunger pump is switched between a first output torque and a second output torque.
In this embodiment, the hydraulic system of the backhoe loader preferably further comprises a state switch communicatively coupled to the loader and the backhoe for controlling the operational state of the backhoe loader to switch between the loading end (loader work) and the backhoe end (backhoe work).
The state change-over switch is also in communication connection with the control device 3, when the loader-digger is switched to the digging end through the state change-over switch, the control device 3 receives a signal transmitted by the state change-over switch, the control device 3 reduces the rotating speed of the engine 2 to a first rotating speed so as to reduce the output power of the engine 2 to a first output power, and meanwhile, the control device 3 inputs a larger current to the electric control plunger pump 1 so as to improve the output torque of the electric control plunger pump 1, so that the output power of the electric control plunger pump 1 is kept unchanged, the output power of the electric control plunger pump 1 is matched with the output power of the engine 2, and the oil consumption and the noise of the engine 2 are reduced. Similarly, when the loader-digger is switched to the loading end through the state switch, the control device 3 receives the corresponding signal transmitted by the state switch, the control device 3 increases the rotation speed of the engine 2 to the second rotation speed, so that the engine 2 outputs at the second power and full power, and simultaneously the control device 3 inputs a smaller current to the electrically controlled plunger pump 1 to reduce the output torque of the electrically controlled plunger pump 1, thereby maintaining the output power of the electrically controlled plunger pump 1 unchanged.
The application provides a hydraulic system control method of a loader-digger, which comprises the following steps as shown in figure 2:
200, when the loading device is used, controlling the rotating speed of the engine through the control device to increase the rotating speed of the engine to a second rotating speed, and outputting the engine at a second output power with full power at the second rotating speed; meanwhile, a small current is input to the electric control plunger pump through the control device, and the output torque of the electric control plunger pump is reduced to a second output torque, so that the output power of the large-displacement electric control plunger pump is kept unchanged.
The application also provides a backhoe loader comprising the hydraulic system of the backhoe loader of any of the above embodiments.
In this embodiment, the backhoe loader includes the hydraulic system of the backhoe loader, and thus the backhoe loader has all the advantages of the hydraulic system of the backhoe loader, which will not be described in detail herein.
In this embodiment, preferably, the backhoe loader further comprises a traveling device, the traveling device is connected with the output end of the engine 2 through a gearbox, and when the backhoe loader is switched to the loading end operation, the output power of the engine 2 can meet the consumption of a hydraulic system of the loading device and the consumption of the traveling device, so that the backhoe loader can stably operate during the loading operation.
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 (10)
1. The hydraulic system of the loader-digger is characterized by comprising an engine, a hydraulic pump, a loading end main valve and an excavating end main valve;
an oil inlet of the hydraulic pump is used for being connected with an oil tank, and an oil outlet of the hydraulic pump is correspondingly connected with the loading device and the excavating device through the loading end main valve and the excavating end main valve respectively;
the output end of the engine is connected with the input end of the hydraulic pump;
the output power of the engine and the output torque of the hydraulic pump are adjustable.
2. The hydraulic system of a backhoe loader of claim 1, wherein the hydraulic pump is an electronically controlled plunger pump.
3. The hydraulic system of a backhoe loader of claim 2, wherein the engine has a first output power and a second output power, and the first output power is less than the second output power;
the electrically controlled plunger pump has a first output torque and a second output torque; when the engine is connected with the hydraulic pump at a first output power, the electric control plunger outputs a first output torque; when the engine is connected with the hydraulic pump at a second output power, the electronic control plunger outputs a second output torque; the first output torque is greater than the second output torque.
4. The hydraulic system of the backhoe loader of claim 3, further comprising a control device;
the control device is in communication connection with the engine and can control the rotating speed of the engine so as to enable the engine to switch between the first output power and the second output power.
5. The hydraulic system of a backhoe loader of claim 4, wherein the control device is communicatively coupled to the electronically controlled plunger pump;
the control device can control the input current of the electrically controlled plunger pump to switch the electrically controlled plunger pump between the first output torque and the second output torque.
6. The hydraulic system of the backhoe loader of claim 4, further comprising a status switch;
the state switch is in communication connection with the loading device and the excavating device and is used for switching the working states of the loading device and the excavating device;
the state switch is in communication connection with the control device.
7. The hydraulic system of a backhoe loader of claim 2, wherein the electronically controlled ram pump has a displacement of 5-105L/r.
8. A hydraulic system control method of a backhoe loader is characterized by comprising the following steps:
step 100, when the excavating device is used, reducing the rotating speed of an engine through a control device to reduce the output power of the engine to a first output power;
inputting a large current to an electric control plunger pump through a control device, so that the output torque of the electric control plunger pump is increased to a first output torque;
200, when a loading device is used, increasing the rotating speed of the engine through a control device to increase the output power of the engine to a second output power;
and inputting a small current to the electric control plunger pump through a control device, so that the output torque of the electric control plunger pump is reduced to a second output torque.
9. A backhoe loader comprising the hydraulic system of the backhoe loader of any of claims 1 to 7.
10. The backhoe loader of claim 9, further comprising a running gear; the walking device is connected with the engine through a gearbox.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010418926.8A CN111549848A (en) | 2020-05-18 | 2020-05-18 | Hydraulic system and control method of backhoe loader and backhoe loader |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010418926.8A CN111549848A (en) | 2020-05-18 | 2020-05-18 | Hydraulic system and control method of backhoe loader and backhoe loader |
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| CN111549848A true CN111549848A (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112459162A (en) * | 2020-11-25 | 2021-03-09 | 江苏徐工工程机械研究院有限公司 | Working condition adaptive power system, control method and loader-digger |
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Application publication date: 20200818 |
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