CN110939171A - Hydraulic system, excavator and control method - Google Patents
Hydraulic system, excavator and control method Download PDFInfo
- Publication number
- CN110939171A CN110939171A CN201911375142.5A CN201911375142A CN110939171A CN 110939171 A CN110939171 A CN 110939171A CN 201911375142 A CN201911375142 A CN 201911375142A CN 110939171 A CN110939171 A CN 110939171A
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- oil
- hydraulic system
- valve
- engine
- stop valve
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims abstract description 150
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 18
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
- E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
-
- 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
-
- 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
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
Abstract
The embodiment of the invention provides a hydraulic system, an excavator and a control method, and relates to the technical field of engineering equipment. The embodiment of the invention provides a hydraulic system which comprises a controller, a power pump, an electric control stop valve, an oil inlet pipe and an oil tank. The electric control stop valve is arranged on a pipeline of the power pump and the oil tank, the oil inlet pipe is communicated with the power pump, hydraulic oil in the oil tank is pumped into the oil inlet pipe through the power pump, and the oil inlet pipe is communicated with the breaking hammer so as to supply oil to the breaking hammer. When needing to be maintained, the oil tank can be separated from the pipeline only by closing the electric control stop valve, the hydraulic oil of the whole machine does not need to be extracted, the secondary pollution to the hydraulic oil in the maintenance process can be effectively avoided, and the maintenance is more convenient and faster. The controller is electrically connected with the electric control stop valve, and the controller is used for controlling the electric control stop valve, so that the foolproof and mistake-proofing problems in the use process of a user are solved by intelligently controlling the opening and closing of the electric control stop valve through the controller.
Description
Technical Field
The invention relates to the technical field of engineering equipment, in particular to a hydraulic system, an excavator and a control method.
Background
The excavator is one of the most widely used engineering machines in engineering construction, and the excavator mainly works in a hydraulic driving mode.
The existing excavator needs to extract hydraulic oil of the whole excavator when maintenance personnel maintain the whole excavator in the maintenance and repair process, the maintenance time is wasted, and secondary pollution of the hydraulic oil is easily caused in the process of disassembling an oil tank.
Disclosure of Invention
The object of the present invention consists, for example, in providing a hydraulic system which is capable of improving the technical problem of the prior art that the maintenance of excavators is time-consuming.
The invention also aims to provide an excavator, which comprises the hydraulic system.
The object of the invention is also to provide a control method for controlling a hydraulic system.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a hydraulic system, which is used for hydraulically controlling a breaking hammer and comprises a controller, a power pump, an electric control stop valve, an oil inlet pipe and an oil tank, wherein the controller is connected with the power pump; the electric control stop valve is arranged on the pipelines of the power pump and the oil tank; the oil inlet pipe is communicated with the power pump, the power pump is used for pumping hydraulic oil in the oil tank into the oil inlet pipe, and the oil inlet pipe is communicated with the breaking hammer; the controller is electrically connected with the electric control stop valve and is used for controlling the electric control stop valve.
Optionally, the controller is electrically connected to the power pump, so that the controller controls the electrically controlled stop valve according to the working state of the power pump.
Optionally, the power pump includes a pump body and an engine, the engine is in transmission connection with the pump body, and the engine is used for driving the pump body to operate; the engine is electrically connected with the controller; the pump body is communicated with the oil tank through the electric control stop valve.
Optionally, the hydraulic system further includes a main valve disposed on the oil inlet pipe, and the main valve has an oil outlet communicated with the oil tank; the hydraulic system further comprises a switching pipeline communicated with the main valve, and the switching pipeline is used for switching the main valve between an oil inlet state and an oil return state; when the main valve is in an oil inlet state, the oil inlet pipe is used for communicating the power pump with the breaking hammer; when the main valve is in an oil return state, the power pump is communicated with the oil tank through the main valve.
Optionally, the switching pipeline includes a pilot pump and an electromagnetic valve, and the electromagnetic valve is respectively communicated with the pilot pump and the main valve; the solenoid valve is electrically connected with the controller.
Optionally, the hydraulic system further includes an oil return pipe and an overflow valve; two ends of the oil return pipe are respectively communicated with the breaking hammer and the oil tank; and two ends of the overflow valve are respectively communicated with the oil inlet pipe and the oil return pipe.
Optionally, the hydraulic system further includes a safety overload valve, and two ends of the safety overload valve are respectively communicated with the oil inlet pipe and the oil return pipe.
Optionally, the hydraulic system further includes a radiator disposed on the oil return pipe.
The embodiment of the invention also provides the excavator. The excavator comprises a breaking hammer and the hydraulic system.
The embodiment of the invention also provides a control method. The control method is used for controlling the hydraulic system. The hydraulic system comprises an ignition switch, an engine, a pump body, an electronic control stop valve and an oil tank, wherein the pump body is communicated with the oil tank through the electronic control stop valve, and the engine is in transmission connection with the pump body so as to drive the pump body to operate; the ignition switch is electrically connected with the engine;
the control method comprises the following steps:
acquiring the working state of the engine;
judging whether the ignition switch is powered on or not;
when the engine is in a flameout state and the ignition switch is not electrified, controlling the electronic control stop valve to be in a closed state; and when the engine is in a flameout state and the ignition switch is electrified, controlling the electric control stop valve to be in an opening state.
The hydraulic system, the excavator and the control method provided by the embodiment of the invention have the beneficial effects that:
embodiments of the present invention provide a hydraulic system for hydraulically controlling a demolition hammer. The hydraulic system comprises a controller, a power pump, an electric control stop valve, an oil inlet pipe and an oil tank. The electric control stop valve is arranged on a pipeline of the power pump and the oil tank, the oil inlet pipe is communicated with the power pump, hydraulic oil in the oil tank is pumped into the oil inlet pipe through the power pump, and the oil inlet pipe is communicated with the breaking hammer so as to supply oil to the breaking hammer. Because be provided with automatically controlled stop valve between power pump and the oil tank, consequently only need close automatically controlled stop valve can break away from oil tank and pipeline when needs maintenance, need not to extract the hydraulic oil of complete machine, the oil tank passes through automatically controlled stop valve and seals moreover, can effectively avoid causing secondary pollution to hydraulic oil in the maintenance process, maintains convenient and fast more. The controller is electrically connected with the electric control stop valve, and the controller is used for controlling the electric control stop valve, so that the foolproof and mistake-proofing problems in the use process of a user are solved by intelligently controlling the opening and closing of the electric control stop valve through the controller.
The embodiment of the invention also provides an excavator, which comprises the hydraulic system. Because this excavator includes foretell hydraulic system, consequently also have and to make the maintenance convenient and fast more, avoid causing secondary pollution to hydraulic oil in the maintenance process, solved the beneficial effect of the foolproof mistake proofing problem in the user's use simultaneously.
The embodiment of the invention also provides a control method for controlling the hydraulic system, which comprises the steps of acquiring the working state of the engine; judging whether the ignition switch is electrified or not; when the engine is in a flameout state and the ignition switch is not electrified, the electronic control stop valve is controlled to be in a closed state, and when the engine is in a flameout state and the ignition switch is electrified, the electronic control stop valve is controlled to be in an open state. The opening and closing of the electric control stop valve are controlled according to the states of the engine and the ignition switch, so that the problem of cavitation of the power pump caused by the fact that the power pump is pumped to empty due to the fact that the electric control stop valve is in a closed state after maintenance is completed is avoided.
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 schematic overall structural diagram of a hydraulic system according to an embodiment of the present invention;
fig. 2 is a step diagram of a control method according to an embodiment of the present invention.
Icon: 100-a hydraulic system; 110-a fuel tank; 121-a controller; 122-an electrically controlled stop valve; 123-a main valve; 124-overflow valve; 125-safety overload valve; 126-a filter; 127-an accumulator; 128-a heat sink; 129-pilot switch; 130-a power pump; 131-an engine; 132-a pump body; 140-switching the pipeline; 141-an electromagnetic valve; 142-a pilot pump; 151-oil inlet pipe; 152-oil return pipe; 160-breaking hammer.
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 if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Fig. 1 is a schematic diagram of an overall structure of a hydraulic system 100 according to the present embodiment. Referring to fig. 1, the present embodiment provides a hydraulic system 100, and accordingly, an excavator (not shown) is provided.
The hydraulic system 100 includes a controller 121, a power pump 130, an electrically controlled shutoff valve 122, an oil inlet pipe 151, and an oil tank 110. The electrically controlled stop valve 122 is disposed on a pipeline between the power pump 130 and the oil tank 110, the oil inlet pipe 151 is communicated with the power pump 130, hydraulic oil in the oil tank 110 is pumped into the oil inlet pipe 151 through the power pump 130, and the oil inlet pipe 151 is used for being communicated with the breaking hammer 160, so as to supply oil to the breaking hammer 160. Because be provided with automatically controlled stop valve 122 between power pump 130 and the oil tank 110, consequently only need to close automatically controlled stop valve 122 and can break away from oil tank 110 and pipeline when needs maintenance, need not to extract the hydraulic oil of complete machine, oil tank 110 seals through automatically controlled stop valve 122 moreover, can effectively avoid causing secondary pollution to hydraulic oil in the maintenance process, and the maintenance is convenient and fast more. Controller 121 is connected with automatically controlled stop valve 122 electricity, and controller 121 is used for controlling automatically controlled stop valve 122 to through the switching of controller 121 intelligent control automatically controlled stop valve 122, solve the foolproof mistake proofing problem in the user's use.
The excavator comprises the hydraulic system 100, and the excavator further comprises a breaking hammer 160 and an excavator body (not shown), wherein the hydraulic system 100 and the breaking hammer 160 are both arranged on the excavator body, and oil is supplied to the breaking hammer 160 through the hydraulic system 100 so as to realize hydraulic control of the breaking hammer 160.
The hydraulic system 100 provided in the present embodiment is further explained below:
referring to fig. 1, in the embodiment, the controller 121 is electrically connected to the power pump 130, so as to automatically control the opening and closing of the electrically controlled stop valve 122 according to the working state of the power pump 130, thereby avoiding the situation that the power pump 130 is started when the electrically controlled stop valve 122 is in the closed state, and further avoiding the situation that the cavitation problem is caused by the air suction of the power pump 130.
Specifically, the power pump 130 includes a pump body 132 and an engine 131. The engine 131 is drivingly connected with the pump body 132, so that the engine 131 provides power for the operation of the pump body 132, i.e., the engine 131 drives the pump body 132 to operate. The pump body 132 is communicated with the oil tank 110 through the electrically controlled shutoff valve 122, and an outlet of the pump body 132 is communicated with the oil inlet pipe 151, so that hydraulic oil in the oil tank 110 is pumped into the oil inlet pipe 151 by operation of the pump body 132 when the electrically controlled shutoff valve 122 is in an open state. Further, the number of the pump bodies 132 is two, and the two pump bodies 132 are in transmission connection with the engine 131, so that the rotation and the stop of the two pump bodies 132 are synchronously controlled by the engine 131. The oil inlet pipe 151 comprises a main pipe, a first branch pipe and a second branch pipe, the first branch pipe is communicated with the outlet of one of the pump bodies 132, the end of the first branch pipe, which is far away from the main pipe, is communicated with the outlet of the other pump body 132, and therefore oil can be synchronously supplied to the oil inlet pipe 151 through the two pump bodies 132, and stable oil pressure in the oil inlet pipe 151 is guaranteed.
The engine 131 is electrically connected to the controller 121, so that the controller 121 can acquire the operating state of the engine 131. Specifically, the controller 121 is a PLC (programmable logic controller) provided in the excavator itself, and the controller 121 can control the electrically controlled stop valve 122 according to the operating state of the engine 131 by editing a program of the PLC. Optionally, a crankshaft speed sensor is disposed on the engine 131, and the crankshaft speed sensor is used to detect a speed of a crankshaft (not shown) of the engine 131 to obtain working state information of the engine 131 in a flameout state or an operating state, so as to ensure that the electronically controlled stop valve 122 is in an open state when the engine 131 operates, thereby preventing the pump body 132 from being sucked empty. It will be appreciated that the operating state of the engine 131 may be obtained in other ways as desired in other embodiments.
The hydraulic system 100 further includes an ignition switch (not shown) electrically connected to the controller 121, and the controller 121 determines whether the ignition switch is powered on. When the engine 131 is in a flameout state and the ignition switch is not powered on, the controller 121 controls the electrically controlled stop valve 122 to be in a closed state, so as to avoid an oil leakage situation during shutdown; when the engine 131 is in a flameout state and the ignition switch is powered on, the controller 121 controls the electrically controlled stop valve 122 to be in an open state, so that after the engine 131 is started, the pump body 132 can smoothly pump the hydraulic oil in the oil tank 110 into the oil inlet pipe 151. Optionally, the electronically controlled stop valve 122 is a normally closed valve, that is, when the engine 131 is in a flameout state and the ignition switch is not powered on, the controller 121 controls the electronically controlled stop valve 122 to be powered off; when the engine 131 is in a flameout state and the ignition switch is powered on, the controller 121 controls the electrically controlled shutoff valve 122 to be powered on.
Further, the hydraulic system 100 further includes a display screen (not shown) electrically connected to the controller 121, when the engine 131 is in a key-off state and the ignition switch is powered on, the controller 121 controls the electrically controlled stop valve 122 to be powered on, but when the electrically controlled stop valve 122 is not switched to the on state, the controller 121 controls the engine 131 not to be normally started and the display screen gives an alarm to indicate that the electrically controlled stop valve 122 is out of order.
Referring to fig. 1, in the present embodiment, the hydraulic system 100 further includes a main valve 123 disposed on the oil inlet pipe 151 and a switching pipeline 140 communicated with the main valve 123, and the switching pipeline 140 is used for controlling the main valve 123 to switch between the oil inlet state and the oil return state. The main valve 123 has an oil outlet communicating with the oil tank 110, and when the main valve 123 is in an oil return state, the main valve 123 communicates the oil inlet pipe 151 with the oil tank 110, so that hydraulic oil pumped into the oil inlet pipe 151 by the power pump 130 returns to the oil tank 110 through the main valve 123; when the main valve 123 is in the oil-in state, the main valve 123 communicates the oil inlet pipe 151 with the breaking hammer 160, so that the hydraulic oil in the oil inlet pipe 151 is smoothly supplied to the breaking hammer 160, thereby controlling the operation of the breaking hammer 160.
Further, the switching line 140 includes a pilot pump 142 and an electromagnetic valve 141, the electromagnetic valve 141 is disposed between the pilot pump 142 and the main valve 123, when the electromagnetic valve 141 is in an open state, the electromagnetic valve 141 connects the pilot pump 142 and the main valve 123, and hydraulic oil is pumped into the main valve 123 through the pilot pump 142, so that the main valve 123 is in an oil-in state; when the electromagnetic valve 141 is in the closed state, the electromagnetic valve 141 connects the pilot pump 142 to the oil tank 110, the hydraulic oil pumped by the pilot pump 142 into the electromagnetic valve 141 is directly returned to the oil tank 110, and the main valve 123 is switched to the oil return state. Specifically, the controller 121 is electrically connected to the pilot switch 129 of the hammer 160, the controller 121 is electrically connected to the electromagnetic valve 141, and when the pilot switch 129 inputs a pilot signal for controlling the operation of the hammer 160 to the controller 121, the electromagnetic valve 141 controls the electromagnetic valve 141 to switch to the open state, so that the main valve 123 is switched to the oil-in state. In this embodiment, the fuel tanks shown in fig. 1 are the same fuel tank.
Referring to fig. 1, in the present embodiment, the hydraulic system 100 further includes an oil return pipe 152 and a relief valve 124. Both ends of the oil return pipe 152 are respectively communicated with the breaking hammer 160 and the oil tank 110, so that the hydraulic oil pumped into the breaking hammer 160 by the pump body 132 through the oil inlet pipe 151 can flow back to the oil tank 110 through the oil return pipe 152. The two ends of the overflow valve 124 are respectively communicated with the oil inlet pipe 151 and the oil return pipe 152, and the pressure of the breaking hammer 160 is controlled by the overflow valve 124, so that the hydraulic stability is ensured. Further, the hydraulic system further includes a safety overload valve 125, two ends of the safety overload valve 125 are respectively communicated with the oil inlet pipe 151 and the oil return pipe 152, and the oil pressure is stabilized by the safety overload valve 125 when the oil pressure is too large or the overflow valve 124 fails, so as to ensure the normal operation of the breaking hammer 160.
It should be noted that, in this embodiment, the outlet of the relief valve 124 is communicated with the oil return pipe 152, and the hydraulic oil entering the relief valve 124 returns to the oil tank 110 through the oil return pipe 152, it is understood that, in other embodiments, the outlet of the relief valve 124 may be directly communicated with the oil tank 110 according to requirements.
Further, the hydraulic system 100 further includes a radiator 128 disposed on the oil return pipe 152, and the radiator 128 cools the hydraulic oil flowing out of the breaking hammer 160, so as to prevent the high-temperature hydraulic oil from entering the oil tank 110. Specifically, the hydraulic system further includes a first pipeline communicating the overflow valve 124 with the oil return pipe 152 and a second pipeline communicating the overload relief valve 125 with the oil return pipe 152, and the radiator 128 is disposed between the second pipeline and the oil tank 110, so as to ensure that the hydraulic oil flowing from the oil return pipe 152 to the oil tank 110 is cooled by the radiator 128 before entering the oil tank 110.
Further, the hydraulic system 100 further includes a filter 126 disposed on the oil return pipe 152, the filter 126 is disposed between the radiator 128 and the breaking hammer 160, and the hydraulic oil is filtered by the filter 126. Further, the hydraulic system further comprises an accumulator 127 arranged on the return pipe 152, the accumulator 127 being arranged between the filter 126 and the breaking hammer 160, the hydraulic stability being ensured by the accumulator 127.
According to the hydraulic system 100 provided in the present embodiment, the operation principle of the hydraulic system 100 is as follows:
when the hydraulic oil pump is used, the controller 121 automatically controls the electrically controlled stop valve 122 to be electrically opened, and the pump pumps hydraulic oil in the oil tank 110 into the oil inlet pipe 151 under the driving of the engine 131. A pilot control signal is sent to the controller 121 through the pilot switch 129, the controller 121 controls the solenoid valve 141 to open after receiving the pilot control signal, the pilot pump 142 pumps hydraulic oil into the main valve 123 to switch the main valve 123 to the oil inlet state, the hydraulic oil in the oil inlet pipe 151 flows to the breaking hammer 160 after passing through the main valve 123, so that the breaking hammer 160 is hydraulically controlled to operate, the hydraulic oil flowing out of the breaking hammer 160 flows back to the oil tank 110 through the oil return pipe 152, and the hydraulic oil sequentially passes through the filter 126 and the radiator 128 before returning to the oil tank 110. After the use is finished, when the controller 121 detects that the engine 131 is in a flameout state and the ignition switch is not powered on, that is, when the excavator stops, the controller 121 controls the electric control stop valve 122 to be powered off and closed, so that an oil leakage phenomenon is prevented from occurring during the stop, and secondary pollution to hydraulic oil in the oil tank 110 during maintenance is avoided.
The hydraulic system 100 provided by the present embodiment has at least the following advantages:
the embodiment of the invention provides a hydraulic system 100, wherein an electric control stop valve 122 is arranged between an oil tank 110 and a pump body 132, so that the electric control stop valve 122 is controlled by a controller 121, secondary pollution to hydraulic oil in the oil tank 110 is prevented by closing the electric control stop valve 122 in the maintenance process, the maintenance is more convenient and quicker, after the maintenance is finished, the controller 121 automatically controls the electric control stop valve 122 to open in the use process of an excavator, the condition that the pump body 132 is sucked empty due to forgetting to open the electric control stop valve 122 is avoided, and the problems of fool-proofing and mistake-proofing in the use process are solved.
The embodiment also provides an excavator, which comprises the hydraulic system 100, so that the excavator is convenient and quick to maintain, secondary pollution to hydraulic oil in the oil tank 110 can be avoided, the situation that the pump body 132 is sucked empty due to forgetting to open the electric control stop valve 122 is avoided, and the beneficial effects of foolproof and mistake proofing problems in the use process are solved.
Fig. 2 is a step diagram of the control method provided in this embodiment. Referring to fig. 2, the present embodiment also provides a control method, which is executed by the controller 121 of the hydraulic system 100 to control the hydraulic system 100. Specifically, the control method comprises the following steps:
SO 1: the operating state of the engine 131 is acquired.
The operating state information of the engine 131 is acquired by detecting an operating parameter of the engine 131, such as the rotational speed of the crankshaft, to determine that the engine 131 is in a key-off state or an operating state.
S02: and judging whether the ignition switch is electrified or not.
S03: when the engine 131 is in a flameout state and the ignition switch is not electrified, controlling the electrically controlled stop valve 122 to be in a closed state; when the engine 131 is in a flameout state and the ignition switch is powered on, the electronically controlled shutoff valve 122 is controlled to be in an open state.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A hydraulic system for hydraulically controlling a breaking hammer (160), characterized in that the hydraulic system (100) comprises a controller (121), a power pump (130), an electrically controlled stop valve (122), an oil inlet pipe (151) and an oil tank (110); the electric control stop valve (122) is arranged on a pipeline between the power pump (130) and the oil tank (110); the oil inlet pipe (151) is communicated with the power pump (130), the power pump (130) is used for pumping hydraulic oil in the oil tank (110) into the oil inlet pipe (151), and the oil inlet pipe (151) is communicated with the breaking hammer (160); the controller (121) is electrically connected with the electric control stop valve (122), and the controller (121) is used for controlling the electric control stop valve (122).
2. The hydraulic system of claim 1, wherein the controller (121) is electrically connected to the power pump (130) such that the controller (121) controls the electrically controlled shut-off valve (122) in accordance with an operating state of the power pump (130).
3. The hydraulic system according to claim 2, characterized in that the power pump (130) comprises a pump body (132) and an engine (131), the engine (131) is in transmission connection with the pump body (132), and the engine (131) is used for driving the pump body (132) to operate; the engine (131) is electrically connected with the controller (121); the pump body (132) is communicated with the oil tank (110) through the electric control stop valve (122).
4. The hydraulic system of claim 1, wherein the hydraulic system (100) further comprises a main valve (123) disposed on the oil inlet pipe (151), the main valve (123) having an oil outlet communicating with the oil tank (110); the hydraulic system further comprises a switching line (140) in communication with the main valve (123), the switching line (140) being for switching the main valve (123) between a fuel-in state and a fuel-return state; the oil inlet pipe (151) is used for communicating the power pump (130) with the breaking hammer (160) when the main valve (123) is in an oil inlet state; when the main valve (123) is in an oil return state, the power pump (130) is communicated with the oil tank (110) through the main valve (123).
5. The hydraulic system according to claim 4, characterized in that the switching line (140) comprises a pilot pump (142) and a solenoid valve (141), the solenoid valve (141) being in communication with the pilot pump (142) and the main valve (123), respectively; the solenoid valve (141) is electrically connected to the controller (121).
6. The hydraulic system of claim 1, wherein the hydraulic system (100) further comprises a return line (152) and a spill valve (124); two ends of the oil return pipe (152) are respectively communicated with the breaking hammer (160) and the oil tank (110); and two ends of the overflow valve (124) are respectively communicated with the oil inlet pipe (151) and the oil return pipe (152).
7. The hydraulic system of claim 6, wherein the hydraulic system (100) further comprises a safety overload valve (125), and both ends of the safety overload valve (125) are respectively communicated with the oil inlet pipe (151) and the oil return pipe (152).
8. The hydraulic system of claim 6, wherein the hydraulic system (100) further comprises a radiator (128) disposed on the oil return pipe (152).
9. An excavator, characterized by comprising a breaking hammer (160) and a hydraulic system (100) according to any one of claims 1-8.
10. A control method for controlling a hydraulic system (100), wherein the hydraulic system (100) comprises an ignition switch, an engine (131), a pump body (132), an electrically controlled stop valve (122) and an oil tank (110), the pump body (132) is communicated with the oil tank (110) through the electrically controlled stop valve (122), and the engine (131) is in transmission connection with the pump body (132) to drive the pump body (132) to operate; the ignition switch is electrically connected with the engine (131);
the control method comprises the following steps:
acquiring the working state of the engine (131);
judging whether the ignition switch is powered on or not;
when the engine (131) is in a flameout state and the ignition switch is not electrified, controlling the electrically-controlled stop valve (122) to be in a closed state; when the engine (131) is in a flameout state and the ignition switch is powered on, the electronic control stop valve (122) is controlled to be in an opening state.
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| CN111705864A (en) * | 2020-06-23 | 2020-09-25 | 三一重机有限公司 | Air source auxiliary crushing system and engineering machinery |
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| CN110939171B (en) | 2024-01-26 |
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