阅读说明：本技术 动力系统及挖掘机 (Power system and excavator ) 是由 李树立 储海军 于 2020-05-28 设计创作，主要内容包括：本发明提供的一种动力系统及挖掘机,涉及挖掘机技术领域,以在一定程度上提升挖掘机在高速行走时的动力,实现挖掘机在紧急情况下的快速撤离。本发明提供的动力系统,用于工程机械设备,包括动力装置、第一离合器、紧急行走泵、多路阀以及启动开关；动力装置分别与多路阀和第一离合器相连接,紧急行走泵连接于第一离合器与多路阀之间,多路阀的输出端分别与行走油路、作业油路以及辅助油路相连通；启动开关能够控制第一离合器吸合以及切断辅助油路。(The invention provides a power system and an excavator, relates to the technical field of excavators, and aims to improve the power of the excavator during high-speed walking to a certain extent and realize quick evacuation of the excavator in emergency. The invention provides a power system for engineering mechanical equipment, which comprises a power device, a first clutch, an emergency walking pump, a multi-way valve and a starting switch, wherein the emergency walking pump is connected with the power device; the power device is respectively connected with the multi-way valve and the first clutch, the emergency traveling pump is connected between the first clutch and the multi-way valve, and the output end of the multi-way valve is respectively communicated with the traveling oil circuit, the operation oil circuit and the auxiliary oil circuit; the starting switch can control the first clutch to suck and cut off the auxiliary oil path.)

1. A power system is used for engineering mechanical equipment and is characterized by comprising a power device, a first clutch, an emergency traveling pump, a multi-way valve and a starting switch;

the power device is respectively connected with the multi-way valve and the first clutch, the emergency traveling pump is connected between the first clutch and the multi-way valve, and the output end of the multi-way valve is respectively communicated with a traveling oil path, an operation oil path and an auxiliary oil path;

the starting switch can control the first clutch to suck and control the multi-way valve to cut off the auxiliary oil way.

2. The power system of claim 1, wherein the power plant includes an engine and a supply pump;

the engine is respectively connected with the oil supply pump and the first clutch, the output end of the oil supply pump is connected with the multi-way valve, and the oil supply pump supplies oil to the walking oil path, the operation oil path and the auxiliary oil path through the multi-way valve.

3. The power system of claim 2, further comprising a joystick and a control valve;

the operating rod is connected with the control valve, the control valve is connected with the multi-way valve, and the operating rod can enable the multi-way valve to cut off the working oil way through the control valve, so that the oil supply pump only supplies oil to the walking oil way.

4. The power system of claim 3, wherein the multi-way valve is an integrated valve set comprising a travel oil control valve, a working oil control valve, and an auxiliary oil control valve.

5. The power system of claim 4, wherein the supply pump comprises a main pump and a pilot pump, a pilot valve is connected to the pilot pump, and the control valve is a solenoid valve;

when the operating lever is pushed to a high-speed gear, the pilot valve is driven by the electromagnetic valve to control the multi-way valve to cut off the working oil way.

6. The power system according to claim 1, wherein the emergency traveling pump is communicated with the multi-way valve through a first oil path, and a check valve is arranged on the first oil path to prevent oil from flowing back.

7. The power system of claim 1, wherein the working fluid circuit comprises a swing fluid circuit, a boom cylinder fluid circuit, an arm cylinder fluid circuit, and a bucket cylinder fluid circuit;

the operation of the engineering mechanical equipment is realized by matching the operation oil way with the walking oil way;

the auxiliary oil way is a cooling pump oil way.

8. The powertrain system of any of claims 1-7, further comprising a controller electrically connected to the start switch, the multiplex valve, and the first clutch, respectively;

when the starting switch is pressed, the starting switch transmits a signal to the controller, the controller controls the first clutch to suck, the emergency traveling pump supplies oil to the multi-way valve, and the controller controls the multi-way valve to cut off the oil supply of the operation oil path and the auxiliary oil path.

9. The power system of claim 8, further comprising a cooling device coupled to the power plant and including a second clutch and a compressor;

the second clutch is connected with the power device, the controller is electrically connected with the second clutch, and the controller can pull the second clutch in order to enable the power device to provide power for the compressor.

10. An excavator comprising a power system as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of excavators, in particular to a power system and an excavator.

Background

The hydraulic excavator is an earth moving machine which excavates materials higher or lower than a machine bearing surface by utilizing hydraulic drive of all joints to perform compound actions and transfers the excavated materials. The bucket type material loading and unloading machine mainly uses the bucket to load and unload materials, and is widely applied to the fields of construction industry, agricultural construction, transportation, national defense, military and the like. However, in some cases, the hydraulic excavator is also used for dismantling tall and big chimneys, water towers, high-risk buildings and the like, and in order to ensure the safety of drivers and equipment, the hydraulic excavator needs to be capable of being quickly evacuated from the site in case of danger.

However, the existing hydraulic excavator only has two gears of walking speed, so that the requirement of rapid and safe evacuation of personnel and equipment cannot be met and guaranteed.

Therefore, it is desirable to provide a power system and an excavator to solve the problems in the prior art to some extent.

Disclosure of Invention

The invention aims to provide a power system and an excavator, which can improve the power of the excavator during high-speed walking to a certain extent and realize quick evacuation of the excavator in emergency.

The invention provides a power system which is used for engineering mechanical equipment and comprises a power device, a first clutch, an emergency walking pump, a multi-way valve and a starting switch, wherein the emergency walking pump is connected with the power device; the power device is respectively connected with the multi-way valve and the first clutch, the emergency traveling pump is connected between the first clutch and the multi-way valve, and the output end of the multi-way valve is respectively communicated with a traveling oil path, an operation oil path and an auxiliary oil path; the starting switch can control the first clutch to suck and control the multi-way valve to cut off the auxiliary oil way.

Wherein the power plant comprises an engine and an oil supply pump; the engine is respectively connected with the oil supply pump and the first clutch, the output end of the oil supply pump is connected with the multi-way valve, and the oil supply pump supplies oil to the walking oil path, the operation oil path and the auxiliary oil path through the multi-way valve.

Specifically, the power system provided by the invention further comprises a control lever and a control valve; the operating rod is connected with the control valve, the control valve is connected with the multi-way valve, and the operating rod can enable the multi-way valve to cut off the working oil way through the control valve, so that the oil supply pump only supplies oil to the walking oil way.

Furthermore, the multi-way valve is an integrated valve group and comprises a walking oil way control valve, an operation oil way control valve and an auxiliary oil way control valve.

Furthermore, the oil supply pump comprises a main pump and a pilot pump, the pilot pump is connected with a pilot valve, and the control valve is an electromagnetic valve; when the operating lever is pushed to a high-speed gear, the pilot valve is driven by the electromagnetic valve to control the multi-way valve to cut off the working oil way.

The emergency walking pump is communicated with the multi-way valve through a first oil way, and a one-way valve is arranged on the first oil way to avoid oil liquid backflow.

The operation oil path comprises a rotary oil path, a movable arm oil cylinder oil path, a bucket rod oil cylinder oil path and a bucket oil cylinder oil path; the working oil way is matched with the walking oil way to realize the excavating operation of the excavator; the auxiliary oil way is a cooling pump oil way.

The power system further comprises a controller, wherein the controller is electrically connected with the starting switch, the multi-way valve and the first clutch respectively; when the starting switch is pressed, the starting switch transmits a signal to the controller, the controller controls the first clutch to suck, the emergency traveling pump supplies oil to the multi-way valve, and the controller controls the multi-way valve to cut off the oil supply of the operation oil path and the auxiliary oil path.

The power system further comprises a cooling device, wherein the cooling device is connected with the power device and comprises a second clutch and a compressor; the second clutch is connected with the power device, the controller is electrically connected with the second clutch, and the controller can pull the second clutch in order to enable the power device to provide power for the compressor.

Compared with the prior art, the power system provided by the invention has the following advantages:

the invention provides a power system for engineering mechanical equipment, which comprises a power device, a first clutch, an emergency walking pump, a multi-way valve and a starting switch, wherein the emergency walking pump is connected with the power device; the power device is respectively connected with the multi-way valve and the first clutch, the emergency traveling pump is connected between the first clutch and the multi-way valve, and the output end of the multi-way valve is respectively communicated with the traveling oil circuit, the operation oil circuit and the auxiliary oil circuit; the starting switch can control the first clutch to suck and control the multi-way valve to cut off the auxiliary oil way.

Because the power device in this application is connected with the multiple-way valve, and the output of multiple-way valve is linked together with walking oil circuit, operation oil circuit and auxiliary oil circuit respectively, consequently, power device can provide power to walking oil circuit, operation oil circuit and auxiliary oil circuit through the multiple-way valve, guarantees the normal operation of excavator. The actuation of the first clutch is controlled by the starting switch, and the multi-way valve is controlled to cut off the auxiliary oil way, so that the centralized oil supply and the supplementary oil supply to the walking oil way are realized.

During normal operation, the power device supplies oil to the traveling oil path, the operation oil path and the auxiliary oil path through the multi-way valve, and the first clutch is in a separated state, so that the emergency traveling pump cannot supplement hydraulic oil to the multi-way valve.

When the emergency traveling state needs to be switched, the oil supply to the auxiliary oil way can be stopped by pressing the starting switch, so that the oil supply of the power device can be intensively supplied into the traveling oil way, the starting switch is pressed, the first clutch is actuated, the power device can drive the emergency traveling pump to supply oil into the multi-way valve, and the oil supply of the traveling oil way is further improved.

In addition, the invention also provides an excavator which comprises the power system.

According to the technical scheme, the starting switch is pressed to control the on-off of the auxiliary oil way and the suction and separation of the first clutch, so that the oil supply of the power device can be centralized into the walking oil way, the hydraulic oil is further supplemented through the emergency walking pump, the power of the excavator during high-speed walking can be improved to a certain extent, and the excavator can be quickly evacuated in emergency.

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 overall structural diagram of a power system according to an embodiment of the present invention.

In the figure: 1-an engine; 2-main pump; 3-a pilot pump; 4-a first clutch; 5-emergency walking pump; 6-first oil way; 7-a one-way valve; 8-a multi-way valve; 9-start switch; 10-a controller; 11-a joystick; 12-a solenoid valve; 13-a walking oil path; 14-working oil circuit; 15-auxiliary oil circuit; 16-a second clutch; 17-compressor.

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.

Fig. 1 is a schematic overall structure diagram of a first view angle of a power system according to an embodiment of the present invention.

As shown in fig. 1, the present invention provides a power system for engineering machinery equipment, which comprises a power device, a first clutch 4, an emergency travel pump 5, a multi-way valve 8 and a start switch 9; the power device is respectively connected with the multi-way valve 8 and the first clutch 4, the emergency walking pump 5 is positioned between the first clutch 4 and the multi-way valve 8, and the output end of the multi-way valve 8 is respectively communicated with the walking oil circuit 13, the working oil circuit 14 and the auxiliary oil circuit 15; the starting switch 9 can control the first clutch 4 to be attracted and the multi-way valve 8 to cut off the auxiliary oil path 15.

The engineering mechanical equipment in the application is mainly an excavator.

Compared with the prior art, the power system provided by the invention has the following advantages:

in the power system provided by the invention, the power device supplies oil through the multi-way valve 8 to supply power to the walking oil path 13, the working oil path 14 and the auxiliary oil path 15, so that the normal operation of the excavator is ensured. The actuation of the first clutch 4 and the on-off of the auxiliary oil path 15 are controlled by the starting switch 9, so that the centralized oil supply and the supplementary oil supply to the walking oil path 13 are realized.

In normal operation, the power unit supplies oil to the travel oil passage 13, the working oil passage 14, and the auxiliary oil passage 15 through the multi-way valve 8, and the first clutch 4 is in the disengaged state, so that the emergency travel pump 5 does not supply hydraulic oil to the multi-way valve 8.

Since the purpose of emergency travel is to enable the excavator to be quickly evacuated, the operating lever 11 is necessarily in a high-speed gear position when the excavator is in an emergency travel state, and the multi-way valve 8 cuts off the oil supply to the working oil path 14 when the operating lever 11 is in the high-speed gear position to ensure maximum power input to travel.

Therefore, when the emergency traveling state needs to be switched, the starting switch 9 is pressed first, the oil supply of the power device to the auxiliary oil path 15 is cut off through the multi-way valve 8, the operating lever 11 is pushed to the high-speed gear, the multi-way valve 8 cuts off the working oil path, so that the oil supply of the power device can be intensively supplied into the traveling oil path 13, the starting switch 9 is pressed, the first clutch 4 is actuated, the power device can drive the emergency traveling pump 5 to supply oil into the multi-way valve 8, the oil supply of the traveling oil path 13 is further improved, and the traveling is faster than the high-speed traveling state.

It should be noted that, in the present application, the manner in which the starting switch 9 controls the first clutch 4 to be closed and the auxiliary oil path 15 to be cut off may be a circuit control manner, such that a circuit in which the starting switch 9 controls the first clutch 4 and a circuit in which the starting switch 9 controls and the auxiliary oil path 15 form an interlock circuit. When the starting switch 9 is pressed, the first clutch 4 is switched on and is attracted, and the auxiliary oil path 15 is switched off.

As shown in fig. 1, the power plant includes an engine 1 and an oil supply pump; the engine 1 is connected to an oil supply pump and the first clutch 4, respectively, the output end of the oil supply pump is connected to the multi-way valve 8, and the oil supply pump supplies oil to the traveling oil path 13, the working oil path 14, and the auxiliary oil path 15 through the multi-way valve 8.

During operation, the engine 1 drives the oil supply pump to supply oil to the multi-way valve 8, and the multi-way valve 8 supplies oil to the traveling oil path 13, the operation oil path 14 and the auxiliary oil path 15 according to different working conditions of the excavator, so that the excavator can operate.

Specifically, as shown in fig. 1, the power system provided by the invention further comprises a control lever 11 and a control valve; the joystick 11 can control the valve to cause the multi-way valve 8 to block the working oil passage 14 so that the oil supply pump supplies oil only to the traveling oil passage 13.

The control lever 11 in the present application is the control lever 11 for controlling the excavator to travel, and when the control lever 11 is pushed to a high-speed position, the control valve can cause the multi-way valve 8 to cut off the oil supply to the working oil path 14, thereby increasing the oil supply to the traveling oil path 13 and realizing high-speed traveling.

Further, the oil supply pump comprises a main pump 2 and a pilot pump 3, the pilot pump 3 is connected with a pilot valve, and the control valve is an electromagnetic valve 12; when the joystick 11 is pushed to the high gear, the solenoid valve 12 drives a pilot valve (not shown in the figure) to control the multi-way valve 8 to cut off the working oil path 14.

Preferably, the number of the main pumps 2 in the present application is two, the two main pumps 2 supply oil to the traveling oil path 13, the working oil path 14 and the auxiliary oil path 15 to provide power, when the operating lever 11 operates to a high-speed gear, the electromagnetic valve 12 receives a signal and drives the pilot valve, the pilot valve in the present application is also an integrated valve body in the multi-way valve 8, and the electromagnetic valve 12 makes the multi-way valve 8 cut off the oil supply to the working oil path 14, so as to realize high-speed traveling of the excavator.

It should be noted that, in the present application, the main pump 2 is preferably a variable displacement pump, and the pilot pump 3 and the emergency travel pump 5 are both fixed displacement pumps. Because the emergency running pump 5 supplements the oil supply to the running oil path 13 by using the allowance of the engine 1 in the emergency running state, the fixed displacement pump is selected, so that the allowance of the engine 1 can be matched, the overload problem of the engine 1 is avoided, and the oil supply to the running oil path 13 can be better supplemented in the emergency running state.

Furthermore, as shown in fig. 1, the emergency travel pump 5 is communicated with the multi-way valve 8 through a first oil path 6, and a check valve 7 is arranged on the first oil path 6 to prevent oil from flowing back.

Through set up check valve 7 on first oil circuit 6, can make hydraulic oil only can get into multiple unit valve 8 through urgent walking pump 5, when having guaranteed that whole hydraulic system is stable, also guaranteed to provide supplementary hydraulic oil to walking oil circuit 13 in the state of urgent walking.

As shown in fig. 1, the working oil path 14 includes a swing oil path, a boom cylinder oil path, an arm cylinder oil path, and a bucket cylinder oil path; the working oil passage 14 is matched with the traveling oil passage 13 to perform an excavating operation of the excavator, and the auxiliary oil passage 15 is a cooling pump oil passage.

The multi-way valve 8 is an integrated valve group and comprises a walking oil path 13 control valve, an operation oil path 14 control valve and an auxiliary oil path control valve.

The walking oil way control valve in the application is correspondingly communicated with the walking oil way 13 and comprises a reversing valve and an unloading valve. The operation oil path control valve comprises a stop valve, a rotary oil path control valve corresponding to the rotary oil path, an arm oil path control valve corresponding to an arm oil path, a movable arm oil path control valve corresponding to a movable arm oil path and a bucket oil path control valve corresponding to a bucket oil path, and in order to ensure that the arm, the movable arm and the bucket can realize excavation operation, the movable arm oil path control valve, the arm oil path control valve and the bucket oil path control valve all comprise reversing valves, unloading valves and holding valves. The auxiliary oil path control valve is a cooling pump oil path control valve corresponding to the cooling pump oil path.

In the normal operation mode, the excavator performs excavation work by the integrated valve group formed by the valve body, i.e., the multi-way valve 8. When the excavator needs to run emergently, the cut-off valve in the multi-way valve 8 is controlled by the starting switch 9 to cut off the oil supply to the auxiliary oil path 15, the operating lever 11 is pushed to a high-speed gear, the multi-way valve 8 cuts off the oil supply to the working oil path 14, so that the oil supply of the main pump 2 completely enters the running oil path 13, and then the emergency running pump 5 supplements the oil to the running oil path 13, so that the oil supply amount larger than that of the high-speed gear is realized, and the running speed of the excavator is improved.

As shown in fig. 1, the power system provided by the invention further includes a controller 10, and the controller 10 is electrically connected to the starting switch 9, the multi-way valve 8 and the first clutch 4 respectively; when the starting switch 9 is pressed, the starting switch 9 transmits a signal to the controller 10, the controller 10 controls the first clutch 4 to be attracted, so that the emergency traveling pump 5 supplies oil to the multi-way valve 8, and the controller 10 controls the multi-way valve 8 to cut off the oil supply of the working oil path 14 and the auxiliary oil path 15.

In the present application, the controller 10 can quickly start the emergency travel pump 5 and shut off the auxiliary oil passage 15. The controller 10 in the present application may adopt a control system provided in an existing excavator, and write a control mode into a control chip in the control system through a programming language, where the control chip may be a PLC or a single chip microcomputer.

When the hydraulic excavator is used, the starting switch 9 is pressed, the controller 10 receives a signal and controls the first clutch 4 to suck, the multi-way valve 8 is controlled to cut off the auxiliary oil way 15, and the operating rod 11 is pushed to a high-speed gear, so that the emergency walking function of the excavator is realized.

Specifically, as shown in fig. 1, the power system provided by the invention further includes a cooling device, wherein the cooling device is connected with the engine 1 and comprises a second clutch 16 and a compressor 17; the second clutch 16 is connected with the engine 1, the controller 10 is electrically connected with the second clutch 16, and the controller 10 can control the second clutch 16 to be closed so that the engine 1 can provide power for the compressor 17.

Can promote the comfort level of driver in hot operation environment through the heat sink in this application. When the excavator needs to be switched to the emergency traveling state, in order to ensure that the power of the engine 1 only supplies oil to the traveling oil passage 13 to a certain extent, the controller 10 enables the first clutch 4 to be closed, and the second clutch 16 to be opened, so that the engine 1 can only supply power to the emergency traveling pump 5 and the oil supply pump, other loads are eliminated, and the traveling speed of the excavator is further increased to a certain extent.

In addition, as shown in fig. 1, the invention also provides an excavator, which comprises the power system.

The excavator adopting the power system can quickly realize a higher walking state of the excavator only by pressing the starting switch 9 when meeting the emergency evacuation condition, so that the emergency evacuation capability of the excavator is improved to a certain extent, and the operation safety of drivers is ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.