CN114607653A - Excavator hoisting working condition hydraulic system and control method thereof - Google Patents
Excavator hoisting working condition hydraulic system and control method thereof Download PDFInfo
- Publication number
- CN114607653A CN114607653A CN202210104742.3A CN202210104742A CN114607653A CN 114607653 A CN114607653 A CN 114607653A CN 202210104742 A CN202210104742 A CN 202210104742A CN 114607653 A CN114607653 A CN 114607653A
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- hydraulic
- control valve
- pilot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/82—Luffing gear
-
- 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
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/004—Fluid pressure supply failure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an excavator hoisting working condition hydraulic system and a control method thereof in the technical field of engineering vehicles, and aims to solve the problems that in the prior art, the excavator hoisting operation fails, a heavy object is suspended in a half-empty state and is detained to influence the personal safety of operating personnel, troubleshooting faults and the like. The device comprises a lifting module and a fault braking module; the fault braking module comprises a hydraulic control reversing valve, an emergency storage bin and a shuttle valve; the emergency storage bin is connected between the pilot pump and the pilot control valve, the main control valve is opened by using hydraulic oil stored in the emergency storage bin, and the batwing changing mechanism downwards extends and descends under the action of the gravity of a heavy object; the invention is suitable for the hoisting operation process of the excavator, and can ensure that the goods in the fault are safely lowered.
Description
Technical Field
The invention relates to a hydraulic system for a hoisting working condition of an excavator and a control method thereof, belonging to the technical field of engineering vehicles.
Background
In the process of hoisting operation of the excavator in the prior art, an engine is flameout and cannot be started or a hydraulic pump fails due to damage of a sensor and a transmission line, so that the excavator cannot work normally. The hung heavy object is suspended in the air, on one hand, the repeated long-time suspension of the heavy object can reduce the working performance of the excavator, and the service life of the excavator is shortened; on the other hand, the heavy object can not be descended, which brings more difficulty to troubleshooting and solving; the heavy object is hung in the half-empty space, and potential safety hazards can be brought to the operation personnel for troubleshooting.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an excavator hoisting working condition hydraulic system and a control method thereof.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
on one hand, the invention provides an excavator hoisting working condition hydraulic system which comprises a lifting module and a fault braking module; the lifting module comprises a hydraulic pump, a main control valve, a hydraulic oil cylinder, a pilot pump and a pilot control valve; a piston rod of the hydraulic oil cylinder is in transmission connection with the amplitude variation mechanism; the hydraulic pump and the pilot pump are respectively connected with an oil tank; one path of hydraulic oil output by the pilot pump enters the main control valve through the pilot control valve and the first lifting oil path and is used for opening the main control valve; hydraulic oil in the hydraulic pump enters a rod cavity of the hydraulic oil cylinder through a first oil inlet of a main valve and a second lifting oil way to realize lifting of the luffing mechanism; hydraulic oil in a rodless cavity of the hydraulic oil cylinder flows back to the oil tank from a second descending oil way and a main valve oil return port of the main control valve;
hydraulic oil output by the pilot pump enters the main control valve through the pilot control valve and the first descending oil way and is used for opening the main control valve; hydraulic oil of the hydraulic pump enters a rodless cavity of the hydraulic oil cylinder through a second oil port of a main valve and the second descending oil way, and the hydraulic oil in a rod cavity of the hydraulic oil cylinder flows back to the oil tank through the second lifting oil way and a main valve oil return port of the main control valve to realize the descending of the luffing mechanism;
the fault braking module comprises a hydraulic control reversing valve, an emergency storage bin and a shuttle valve; the emergency storage bin is connected between the pilot pump and the pilot control valve, and the main control valve is opened by using hydraulic oil stored in the emergency storage bin; the first branch on the first descending oil path is sequentially connected with a supercharger, a hydraulic control reversing valve and a shuttle valve; the shuttle valve is connected with the balance valve through a fourth branch and is used for opening the balance valve; the bat changing mechanism is downward under the gravity of the weight and extends out and descends.
Further, the balance valve is connected between the second lifting oil passages; and the shuttle valve is connected with the second descending oil way through a fifth branch and is used for opening the balance valve.
Further, a first oil outlet channel in the pilot control valve is connected with the oil tank; an electromagnetic reversing valve is connected between the emergency storage bin and the pilot control valve and is used for controlling the pilot control valve; and an oil drain port of a solenoid valve of the solenoid directional valve is connected with the first oil outlet path.
Further, a left check valve is connected between the pilot pump and the supercharger; the oil inlet of the left check valve is communicated with a control port of a hydraulic control reversing valve through a second branch circuit; and an oil outlet of the left one-way valve is connected with a second oil outlet of a hydraulic control reversing valve through a third branch.
Further, a right one-way valve is connected between the pilot pump and the emergency storage bin; and the oil outlet of the right one-way valve is communicated with the emergency oil outlet of the emergency storage bin.
Furthermore, the first descending oil path is connected with a second oil inlet of the supercharger through a first branch path.
Furthermore, a first oil outlet of a hydraulic control valve on the hydraulic control reversing valve is connected with the oil tank.
On the other hand, the invention provides a control method of a hydraulic system under the hoisting working condition of an excavator, which comprises one or more of the following control methods:
in a normal state:
the control method A comprises the following steps: controlling the pilot control valve, and opening the main control valve by using the hydraulic oil output by the pilot pump through the pilot control valve and the first lifting oil way; hydraulic oil output by the hydraulic pump sequentially enters a rod cavity of the hydraulic oil cylinder through the main control valve and the balance valve to realize lifting of the amplitude variation mechanism, and the hydraulic oil in the rodless cavity of the hydraulic oil cylinder enters the main control valve through the second descending oil way and flows back to the oil tank from a main valve oil return port of the main control valve;
the control method B comprises the following steps: the pilot control valve is controlled, and hydraulic oil output by the pilot pump passes through the pilot control valve and the first descending oil way to open the main control valve; hydraulic oil output by the hydraulic pump sequentially enters a rodless cavity of the hydraulic oil cylinder through the main control valve and a second oil port of the main control valve to realize the descending of the amplitude variation mechanism, and hydraulic oil in a rod cavity of the hydraulic oil cylinder enters the main control valve through a second lifting oil way and flows back to the oil tank from a main valve oil return port of the main control valve;
in a fault state, when the weight is suspended and half empty, the luffing mechanism descends:
and the control method C comprises the following steps:
the pilot control valve is controlled, hydraulic oil output by the emergency storage bin passes through the pilot control valve and the first descending oil way, and a first oil port of a main control valve of the main control valve is opened; meanwhile, hydraulic oil output by the emergency storage bin enters the supercharger through the first branch to be converted into high-pressure oil; and the high-pressure oil sequentially passes through the hydraulic control reversing valve and the shuttle valve, the high-pressure oil entering the shuttle valve enters and opens the balance valve through the fourth branch, and the hydraulic oil in the rod cavity of the hydraulic oil cylinder enters the main control valve through the second lifting oil way and flows back to the oil tank from the main valve oil return port of the main control valve, so that the descending of the luffing mechanism is realized.
Further, in a normal state, when the control method A or the control method B is adopted, the hydraulic oil output by the pilot pump is continuously supplied to the emergency storage bin.
Compared with the prior art, the invention has the following beneficial effects:
according to the excavator hoisting working condition hydraulic system provided by the invention, when a hoisted heavy object is suspended in the air, the whole excavator cannot work normally due to the fault of an engine or the fault of a hydraulic pump; for safety and convenient maintenance, the main control valve is opened by hydraulic oil stored in an emergency storage bin in the fault braking module under the combined action control of the arranged fault braking module and the lifting module; the hydraulic oil in the rod cavity flows back to the direction of the oil tank, impedance force is not generated when the piston rod moves rightwards, and the weight downwards pulls the luffing mechanism to stretch out and descend, so that the weight is lowered, the operation safety of personnel is ensured, and compared with the excavator which is half-empty due to failure stagnation in the prior art, the invention can prolong the service life of the excavator.
According to the control method of the hydraulic system under the hoisting working condition of the excavator, the excavator is lifted by the control method A and the control method B in a normal state; and in the fault state, when the weight is suspended to be half empty, the control method C is started, and the excavator can be adjusted to descend the weight to the ground.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic system under a hoisting condition of an excavator;
in the figure: 1. an oil tank; 2. a hydraulic pump; 3. a pilot pump; 4. a right check valve; 5. a left check valve; 6. a supercharger; 7. a pilot control valve; 8. a shuttle valve; 9. a master control valve; 10. an electromagnetic directional valve; 11. a pilot operated directional control valve 11; 12. a hydraulic cylinder; 13. a balancing valve; 14. emergency storage; 15. a rodless cavity; 16. a rod cavity; 17. a first lift oil path; 18. a second lift oil path; 19. a first descending oil path; 20. a second descending oil path; 21. a first oil outlet path 22 and a second oil outlet path; 23. a first shunt; 24. a second branch circuit; 25. a third branch circuit; 26. a fourth branch circuit; 27. a fifth branch circuit;
4a, a right check valve oil inlet; 4b, a right one-way valve oil outlet; 5a, a left check valve oil inlet; 5b, a left check valve oil outlet; 6a, a first oil inlet of the supercharger; 6b, a second oil inlet of the supercharger; 6c, a supercharger oil outlet; 7a, pilot control of a first oil inlet; 7b, a pilot control oil return port; 7c, pilot-controlling the first working oil port; 7d, pilot-controlling a second working oil port; 8a, a shuttle valve oil inlet; 8b, a shuttle valve oil outlet; 8c, a shuttle valve working oil port; 9a, a first oil inlet of a main valve; 9b, a main valve oil return port; 9c, a first main valve oil port; 9d, a main valve second oil port; 9e, a second oil inlet of the main valve; 9f, a third main valve oil inlet; 10a, an electromagnetic valve oil inlet; 10b, an electromagnetic valve oil outlet; 10c, an oil drainage port of the electromagnetic valve; 11a, a first oil outlet of a hydraulic control valve; 11b, a first oil inlet of a hydraulic control valve; 11c, a second oil outlet of a hydraulic control valve; 11d, a second oil inlet of the hydraulic control valve; 11e, a hydraulic control valve control opening; 13a, a balance valve oil inlet; 13b, a balance valve oil outlet; 13c, a balance valve working oil port; 14a and an emergency oil outlet.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The first embodiment is as follows:
referring to fig. 1, the embodiment provides an excavator hoisting working condition hydraulic system, which comprises a lifting module and a fault braking module. The lifting module comprises a hydraulic pump 2, a main control valve 9, a hydraulic oil cylinder 12, a pilot pump 3 and a pilot control valve 7. The piston rod in the hydraulic oil cylinder 12 is connected with the bats changing mechanism in a transmission way, the hydraulic oil cylinder 12 comprises a rod cavity 16 and a rodless cavity 15, and the piston rod is arranged in the rod cavity 16.
A first main valve oil inlet 9a and a main valve oil return port 9d of the main control valve 9 are respectively connected with the connecting oil tank 1; a main valve first oil port 9c of the main control valve 9 is connected with a rod cavity port of the rod cavity 16 through a second lifting oil way 18; a main valve second oil port 9d of the main control valve 9 is connected with a rodless cavity port of the rodless cavity 15 through a second descending oil path 20; a main valve second oil inlet 9e of the main control valve 9 is connected with a pilot control first working oil port 7c of the pilot control valve 7 through a first descending oil path 19 and used for reversing the main control valve 9; the main valve third oil inlet 9f of the main control valve 9 is connected to the pilot control second working oil port 7d of the pilot control valve 7 through a first lift oil passage 17.
The second lift oil path 18 is provided with a balance valve 13, and a balance valve oil inlet 13a and a balance valve oil outlet 13b are respectively connected to the second lift oil path 18. The shuttle valve in the faulty brake module is connected to the second descending oil path 20 through the fifth branch path 27, and the shuttle valve 8 is connected to the balancing valve 13 through the fourth branch path 26, both of which function to open the balancing valve 13 to facilitate smooth passage of the hydraulic oil through the balancing valve 13.
One path of hydraulic oil output by the pilot pump 3 enters the main control valve 9 through the pilot control valve 7 and the first lifting oil path 17, and is used for opening the main control valve 9. The hydraulic oil in the hydraulic pump 2 is led to the main control valve 9, passes through the second oil port 9d of the main valve, is led to the shuttle valve 8 through the second descending oil path 20 and the fifth branch path, is then conveyed to the shuttle valve working oil port 8c by the shuttle valve 8, passes through the balance valve working oil port 13c, and opens the balance valve 13. Meanwhile, hydraulic oil in the hydraulic pump 2 enters the rod cavity 16 through the first oil inlet 9a of the main valve, the second lifting oil way 18 and the balance valve 13, so that the lifting of the luffing mechanism is realized; the hydraulic oil in the rodless chamber 15 is returned to the oil tank 1 by the second descending oil passage 20 and the main valve oil return port 9 d.
The hydraulic oil output from the pilot pump 3 passes through the pilot control valve 7 and the first drop oil passage 19, and enters the main control valve 9 to open the main control valve 9. The hydraulic oil in the hydraulic pump 2 is led to the main control valve 9, passes through the second oil port 9d of the main valve, is led to the shuttle valve 8 through the second descending oil path 20 and the fifth branch path, is then conveyed to the shuttle valve working oil port 8c by the shuttle valve 8, passes through the balance valve working oil port 13c, and opens the balance valve 13. The hydraulic oil of the hydraulic pump 2 enters the rodless cavity 15 through the second main valve oil port 9d and the second descending oil path 20, and the hydraulic oil in the rod cavity 16 flows back to the oil tank 1 through the second lifting oil path 18, the balance valve 13 and the main valve oil return port 9d, so that the descending of the luffing mechanism is realized.
The fault braking module comprises a pilot operated directional control valve 11, an emergency reservoir 14 and a shuttle valve 8. An emergency oil outlet 14a of the emergency storage bin 14 is respectively connected with an oil outlet of the pilot pump 3 and a first oil inlet of the pilot control valve 7. The oil outlet path of the pilot pump 3 is connected with a first supercharger oil inlet 6a of the supercharger 6, and the hydraulic oil of the pilot pump 3 is sent into the supercharger 6 to be changed into high-pressure oil. The hydraulic oil changed into high-pressure oil enters the second descending oil path 20 through the second oil outlet 11c of the hydraulic control valve, the oil inlet 8a of the shuttle valve and the oil outlet 8b of the shuttle valve, and then enters the rodless cavity 15 to push the piston rod to move rightwards, namely, the bat changing mechanism descends. The main control valve 9 is opened by utilizing the hydraulic oil stored in the emergency storage bin 14, so that the first oil port 9c of the main valve of the main control valve 9 is opened, the hydraulic oil in the rod cavity 16 is reserved into the main control valve 9 under the action of weight and finally flows back to the oil tank 1, and the hydraulic oil in the rod cavity 16 is reserved back to the oil tank 1, so that the suspended object is pulled downwards to descend under the action of gravity under the condition that the piston rod is not obstructed.
Specifically, the balance valve 13 and the balance valve 13 can optimize the whole hydraulic system, provide the safety of operation and effectively prevent the batwing mechanism from descending in an overspeed mode under the condition that the balance valve 13 is not arranged. The shuttle valve working oil port 8c of the shuttle valve 8 is connected with the balance valve working oil port 13c of the balance valve 13 through the fourth branch 26, and in a fault state, hydraulic oil fed into the shuttle valve 8 from the pilot-controlled directional valve 11 enters the balance valve 13 through the fourth branch 26, the balance valve 13 is opened, and the hydraulic oil in the rod cavity 16 is ensured to smoothly flow back into the oil tank 1. Under normal conditions, hydraulic oil is sent into the second descending oil path 20 through the main control valve 9, is led to the fifth branch path 27 to enter the shuttle valve 8, and then enters and opens the balance valve through the shuttle valve 8 and the fourth branch path 26.
Preferably, a pilot control oil return opening 7b of the pilot control valve 7 is connected with the oil tank 1 through a first oil outlet path 21, an emergency oil outlet 14a of the emergency storage bin 14 is connected with an electromagnetic valve oil inlet 10a of the electromagnetic directional valve 10, an electromagnetic valve oil outlet 10b of the electromagnetic directional valve 10 is connected with the pilot control first oil inlet 7a, and the electromagnetic directional valve 10 is arranged to better control the pilot control valve 7 to operate. The electromagnetic valve oil drain port 10c of the electromagnetic directional valve 10 is connected with the first oil outlet path 21, so that the normal operation of the electromagnetic directional valve 10 can be effectively ensured. The electromagnetic directional valve 10 arranged between the emergency storage bin 14 and the pilot control valve 7 ensures the safety of operation and prevents risks caused by misoperation.
Preferably, a left one-way valve 5 is connected between the pilot pump 3 and the supercharger 6, an oil inlet 5a of the left one-way valve is connected with an oil outlet of the pilot pump 3, and an oil outlet 5b of the left one-way valve is connected with a first oil inlet 6a of the supercharger; the oil outlet 6c of the supercharger is connected with the second oil inlet 11d of the hydraulic control valve. The left check valve oil inlet 5a is connected with a pilot control valve control port 11e of the pilot control reversing valve 11 through a second branch 24, and is used for controlling the on-off of pilot oil, the pilot oil can be reasonably distributed according to actual needs, and the waste of hydraulic oil is avoided. The oil outlet 5b of the left one-way valve is connected with the second oil outlet 11c of the hydraulic control reversing valve 11 through the third branch 25, and the connection and disconnection of the high-pressure oil output by the supercharger 6 can be controlled through the connection method, so that the output high-pressure oil can be conveniently and flexibly controlled. The first oil outlet 11a of the hydraulic control valve is connected with the oil tank 1.
Preferably, a right non-return valve 4 is provided between the emergency reservoir 14 and the pilot pump 3. The right check valve oil inlet 4a is connected with the oil outlet of the pilot pump 3, the right check valve oil outlet 4b is connected with the emergency oil outlet 14a of the emergency storage bin 14, and the right check valve 4 can prevent the pilot pump 3 from entering the emergency storage bin 14 and the electromagnetic directional valve 10 to cause the backflow of hydraulic oil in one way, so that the operation of the whole hydraulic system is influenced.
The first drop oil path 19 is provided with a first branch path 23, the first branch path 23 is connected with a second oil inlet 6b of the supercharger 6, the first branch path 23 provides a low-pressure oil path for the supercharger 6, and low-pressure hydraulic oil output from the first branch path is converted into high-pressure oil through the supercharger 6. In case of failure, the converted high-pressure oil enters the rodless cavity 15, and the suspended semi-empty heavy object is ensured to descend quickly.
Preferably, the first oil inlet 11b of the hydraulic control reversing valve 11 is connected with the oil tank 1 through the second oil outlet path 22, and the pilot oil entering the hydraulic control reversing valve 11 flows back to the oil tank 1 through the second oil outlet path 22; the running hydraulic oil can be returned to the oil tank 1 for sufficient cooling.
Example two:
the embodiment provides a control method of an excavator hoisting working condition hydraulic system, and the excavator hoisting working condition hydraulic system provided by the embodiment can be operated by the method of the embodiment. The control method comprises a control method in a normal state and a control method C when the weight is suspended in a half empty state in a fault state. The control method A for realizing the lifting of the variable-bat mechanism and the control method B for realizing the descending of the variable-amplitude mechanism are included in the normal state.
In a normal state:
and the control method A is adopted to realize the lifting of the luffing mechanism, and the heavy object is pulled upwards. Controlling the pilot control valve 7, enabling the hydraulic oil output by the pilot pump 3 to pass through the pilot control valve 7 and the first lifting oil way 17, and opening the main control valve 9; the main control valve 9 is opened, so that the oil inlets and the oil outlets of the main control valve are conveniently opened, hydraulic oil output by the hydraulic pump 2 sequentially passes through the main control valve 9, the opened first oil path of the main control valve 9 and the balance valve 13 to enter the rod cavity 16 of the hydraulic oil cylinder 12, and the rod cavity 16 is pushed to move leftwards to drive the amplitude variation mechanism to lift. Meanwhile, the hydraulic oil in the rodless cavity 15 of the hydraulic oil cylinder 12 enters the main control valve 9 through the second descending oil path 20 and flows back to the oil tank 1 through the main valve oil return port 9d of the main control valve 9, so that the hydraulic oil in the rodless cavity 15 is prevented from moving leftwards to form an impedance force on the rod cavity 16.
And the control method B is adopted to realize that the amplitude variation mechanism descends and the gravity of the heavy object jointly draws downwards. The pilot control valve 7 is controlled, hydraulic oil output by the pilot pump 3 passes through the pilot control valve 7 and the first descending oil circuit 19, the main control valve 9 is opened, oil inlet and outlet ports on the main control valve 9 are opened, the hydraulic oil output by the hydraulic pump 2 sequentially passes through the main control valve 9 and a second oil port of the opened main control valve 9 to enter the rodless cavity 15 of the hydraulic oil cylinder 12, the rod cavity 16 is pushed to move rightwards, and the amplitude variation mechanism is driven to descend. Meanwhile, the hydraulic oil in the rod cavity 16 of the hydraulic oil cylinder 12 enters the main control valve 9 through the second lifting oil path 18 and flows back to the oil tank 1 through the main valve oil return port 9d of the main control valve 9, so that the hydraulic oil in the rod cavity 16 is prevented from generating resistance force on the rightward movement of the rod cavity 16.
Fault state when the weight is suspended half empty:
and the control method C comprises the following steps: and controlling the pilot control valve 7, enabling hydraulic oil output by the emergency storage bin 14 to pass through the pilot control valve 7 and the first descending oil path 19, and then entering from the second main valve oil inlet 9e to open the main control valve 9, so that the first main valve oil inlet 9a in the main control valve 9 is communicated with the second main valve oil port 9d, and the main valve oil return port 9b is communicated with the first main valve oil port 9 c. The hydraulic oil in the rod chamber 16 of the hydraulic cylinder 12 is discharged into the oil tank 1 through the second lift oil passage 18.
Hydraulic oil output by the emergency storage bin 14 enters the supercharger 6 through the first branch 23 and is converted into high-pressure oil; meanwhile, the high-pressure oil passes through the hydraulic control reversing valve 11 and the shuttle valve 8 in sequence, the high-pressure oil entering the shuttle valve 8 enters and opens the balance valve 13 through the fourth branch 26, and in order to enable the hydraulic oil in the rod cavity 16 of the hydraulic oil cylinder 12 to enter the main control valve 9 through the second lifting oil way 18 and to flow back to the oil tank 1 through the main valve oil return port 9d of the main control valve 9, the descending of the amplitude variation mechanism is realized.
By adopting the control method C, the weight hung in the half-space can be ensured to fall under the condition that the engine is flameout and cannot be started or the hydraulic pump fails due to the damage of the sensor and the transmission line, the overhaul safety of operators is ensured, and the service life of the excavator is prolonged.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A hydraulic system for hoisting working conditions of an excavator is characterized by comprising a lifting module and a fault braking module; the lifting module comprises a hydraulic pump, a main control valve, a hydraulic oil cylinder, a pilot pump and a pilot control valve; a piston rod of the hydraulic oil cylinder is in transmission connection with the amplitude variation mechanism; the hydraulic pump and the pilot pump are respectively connected with an oil tank; one path of hydraulic oil output by the pilot pump enters the main control valve through the pilot control valve and the first lifting oil path and is used for opening the main control valve; hydraulic oil in the hydraulic pump enters a rod cavity of the hydraulic oil cylinder through a first oil inlet of a main valve and a second lifting oil way to realize lifting of the luffing mechanism; hydraulic oil in a rodless cavity of the hydraulic oil cylinder flows back to the oil tank from a second descending oil way and a main valve oil return port of the main control valve;
hydraulic oil output by the pilot pump enters the main control valve through the pilot control valve and the first descending oil way and is used for opening the main control valve; hydraulic oil of the hydraulic pump enters a rodless cavity of the hydraulic oil cylinder through a second oil port of a main valve and the second descending oil way, and the hydraulic oil in a rod cavity of the hydraulic oil cylinder flows back to the oil tank through the second lifting oil way and a main valve oil return port of the main control valve to realize the descending of the luffing mechanism;
the fault braking module comprises a hydraulic control reversing valve, an emergency storage bin and a shuttle valve; the emergency storage bin is connected between the pilot pump and the pilot control valve, and the main control valve is opened by using hydraulic oil stored in the emergency storage bin; the first branch on the first descending oil path is sequentially connected with a supercharger, a hydraulic control reversing valve and a shuttle valve; the shuttle valve is connected with the balance valve through a fourth branch and is used for opening the balance valve; the bat changing mechanism is downward under the gravity of the weight and extends out and descends.
2. The excavator hoisting working condition hydraulic system according to claim 1; the balance valve is connected between the second lifting oil passages; and the shuttle valve is connected with the second descending oil way through a fifth branch and is used for opening the balance valve.
3. The excavator hoisting working condition hydraulic system according to claim 1; the first oil outlet channel in the pilot control valve is connected with the oil tank; an electromagnetic reversing valve is connected between the emergency storage bin and the pilot control valve and is used for controlling the pilot control valve; and an oil drain port of a solenoid valve of the solenoid directional valve is connected with the first oil outlet path.
4. The hydraulic system for hoisting working conditions of the excavator according to claim 1, wherein a left check valve is connected between the pilot pump and the supercharger; the oil inlet of the left check valve is communicated with a control port of a hydraulic control reversing valve through a second branch circuit; and the oil outlet of the left one-way valve is connected with the second oil outlet of the hydraulic control reversing valve through a third branch.
5. The hydraulic system for hoisting working conditions of the excavator according to claim 1, wherein a right check valve is connected between the pilot pump and the emergency storage bin; and the oil outlet of the right one-way valve is communicated with the emergency oil outlet of the emergency storage bin.
6. The hydraulic system for hoisting working conditions of the excavator according to claim 1, wherein the first descending oil path is connected with a second oil inlet of the supercharger through a first branch path.
7. The hydraulic system for hoisting working conditions of the excavator according to claim 1, wherein a first oil outlet of a hydraulic control valve on the hydraulic control reversing valve is connected with the oil tank.
8. A control method of a hydraulic system for a hoisting working condition of an excavator is characterized by comprising one or more of the following control methods:
in a normal state:
the control method A comprises the following steps: the pilot control valve is controlled, and the main control valve is opened by passing the hydraulic oil output by the pilot pump through the pilot control valve and the first lifting oil way; hydraulic oil output by the hydraulic pump sequentially enters a rod cavity of the hydraulic cylinder through the main control valve and the balance valve to realize lifting of the amplitude variation mechanism, and the hydraulic oil in the rodless cavity of the hydraulic cylinder enters the main control valve through a second descending oil way and flows back to the oil tank from a main valve oil return port of the main control valve;
the control method B comprises the following steps: the pilot control valve is controlled, and hydraulic oil output by the pilot pump passes through the pilot control valve and the first descending oil way to open the main control valve; hydraulic oil output by the hydraulic pump sequentially enters a rodless cavity of the hydraulic oil cylinder through the main control valve and a second oil port of the main control valve to realize the descending of the amplitude variation mechanism, and hydraulic oil in a rod cavity of the hydraulic oil cylinder enters the main control valve through a second lifting oil way and flows back to the oil tank from a main valve oil return port of the main control valve;
in a fault state, when the weight is suspended and half empty, the luffing mechanism descends:
and the control method C comprises the following steps:
the pilot control valve is controlled, and hydraulic oil output by the emergency storage bin passes through the pilot control valve and the first descending oil way, and a first oil port of a main control valve of the main control valve is opened; meanwhile, hydraulic oil output by the emergency storage bin enters the supercharger through the first branch to be converted into high-pressure oil; and the high-pressure oil sequentially passes through the hydraulic control reversing valve and the shuttle valve, the high-pressure oil entering the shuttle valve enters and opens the balance valve through the fourth branch, and the hydraulic oil in the rod cavity of the hydraulic oil cylinder enters the main control valve through the second lifting oil way and flows back to the oil tank from the main valve oil return port of the main control valve, so that the descending of the luffing mechanism is realized.
9. The method for controlling the hydraulic system for the hoisting working condition of the excavator according to claim 8, wherein in a normal state, when the control method A or the control method B is adopted, the hydraulic oil output by the pilot pump is continuously supplied to the emergency storage bin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210104742.3A CN114607653A (en) | 2022-01-28 | 2022-01-28 | Excavator hoisting working condition hydraulic system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210104742.3A CN114607653A (en) | 2022-01-28 | 2022-01-28 | Excavator hoisting working condition hydraulic system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114607653A true CN114607653A (en) | 2022-06-10 |
Family
ID=81859139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210104742.3A Pending CN114607653A (en) | 2022-01-28 | 2022-01-28 | Excavator hoisting working condition hydraulic system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114607653A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024036686A1 (en) * | 2022-08-17 | 2024-02-22 | 湖南星邦智能装备股份有限公司 | Aerial work platform emergency descent system and control method |
-
2022
- 2022-01-28 CN CN202210104742.3A patent/CN114607653A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024036686A1 (en) * | 2022-08-17 | 2024-02-22 | 湖南星邦智能装备股份有限公司 | Aerial work platform emergency descent system and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104477798B (en) | The principal arm luffing control system of crane and crane | |
| CN102874704B (en) | Hydraulic system, hoisting mechanism and engineering machinery | |
| CN206872378U (en) | A kind of aerial work platform hydraulic energy-saving system with no-load protection | |
| CN110700337A (en) | Excavator movable arm energy-saving control system and control method | |
| CN114607653A (en) | Excavator hoisting working condition hydraulic system and control method thereof | |
| CN203699758U (en) | Winch hydraulic system and engineering machinery | |
| CN108083116A (en) | A kind of hydraulic control system for crane | |
| CN203428881U (en) | Hydraulic control system of cantilever crane or ladder frame | |
| CN102059973B (en) | Lifting hydraulic integrated system for large-tonnage electric-wheel mining dumper | |
| CN108584739B (en) | Emergency overload protection system and working method thereof | |
| CN104444816A (en) | Hydraulic control system of hoisting machinery and hoisting machinery | |
| CN110963430B (en) | Hydraulic control device and hydraulic control method for winch | |
| CN112173994A (en) | Control valve unit, hydraulic control loop and engineering equipment with telescopic crane boom | |
| CN217107635U (en) | Cab lifting control oil way, hydraulic system and excavator | |
| CN201580876U (en) | Hydraulic station device for mine hoister | |
| CN110410386A (en) | Three-dimensional public transport garage hydraulic power jacking system | |
| CN203373114U (en) | Tube explosion resistant oil hydraulic circuit of vertical lifting mechanism | |
| CN201970903U (en) | Lifting hydraulic integration system of a large-ton electric-wheel mine dump truck | |
| CN108910648A (en) | A kind of hydraulic control circuit for the rope grip device for catching that breaks | |
| CN209890194U (en) | Forklift lifting hydraulic control system and forklift | |
| CN113582093A (en) | Luffing and leveling hydraulic control system of cantilever type aerial work platform | |
| CN210978066U (en) | Hydraulic system with integral box hopper with manual emergency lifting function | |
| CN112377474A (en) | Control method and control system for hydraulic system of vertical garbage compressor | |
| CN110862047A (en) | Hydraulic control device and method for explosion-proof synchronous circuit for elevator | |
| CN110671392A (en) | Hydraulic system with integral box hopper with manual emergency lifting function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |