CN111456127A - Boom oil return regeneration control device, control system, control method and engineering machinery - Google Patents
Boom oil return regeneration control device, control system, control method and engineering machinery Download PDFInfo
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- CN111456127A CN111456127A CN202010289617.5A CN202010289617A CN111456127A CN 111456127 A CN111456127 A CN 111456127A CN 202010289617 A CN202010289617 A CN 202010289617A CN 111456127 A CN111456127 A CN 111456127A
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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
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/425—Drive systems for dipper-arms, backhoes or the like
Abstract
The invention provides a movable arm oil return regeneration control device, a control system, a control method and engineering machinery, relates to the technical field of engineering machinery, and aims to solve the problem that hydraulic energy consumption of the movable arm oil return regeneration control device is high in the descending process of a movable arm. The movable arm oil return regeneration control device comprises a movable arm control valve, wherein the movable arm control valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port is used for being communicated with a rod cavity of a movable arm oil cylinder, the second oil port is used for being communicated with a rodless cavity, the third oil port is used for being communicated with a hydraulic pump, and the fourth oil port is used for being communicated with an oil tank; the boom control valve is configured to have a first state, the first oil port and the second oil port are communicated through the regeneration check valve, the regeneration check valve is configured to be opened from the second oil port to the first oil port in a single direction, the second oil port is communicated to the fourth oil port in a single direction, and the first, second and fourth oil ports are all disconnected from the third oil port. The invention provides a movable arm return oil regeneration control device, a control system, a control method and engineering machinery.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a movable arm return oil regeneration control device, a control system, a control method and engineering machinery.
Background
In the independent and combined actions of the movable arm and the bucket rod of the engineering machinery, due to the action of self weight or inertia, when the movable arm descends, if oil cannot be supplemented in time, the suction of a hydraulic system is empty, and the action of the movable arm is temporarily stopped, so that the operation is not smooth. To eliminate this phenomenon, a boom return oil regeneration device is generally provided in the hydraulic system.
Fig. 1 is a schematic diagram of a boom oil return regeneration control apparatus according to the related art in a non-operation state of a boom cylinder 400 ', and fig. 2 is a schematic diagram of a boom oil return regeneration control apparatus according to the related art in a non-rod chamber oil regeneration operation state of the boom cylinder 400'. As shown in fig. 1 and 2, the boom oil return regeneration control apparatus provided by the prior art includes a hydraulic pump 100 ', a master check valve 200', and a boom control valve 300 ', wherein the boom control valve 300' is a three-position six-way valve. When the boom control valve 300 ' is at the neutral position, the boom cylinder 400 ' is stationary, and the oil output from the hydraulic pump 100 ' is directly supplied to the next joint spool; when the movable arm begins to descend, the movable arm control valve 300 ' is in the left position, the pressure of the rodless cavity of the movable arm oil cylinder 400 ' is greater than that of the rod cavity of the movable arm oil cylinder, oil in the rodless cavity of the movable arm oil cylinder 400 ' flows back to the rod cavity through the regeneration one-way valve 310 ' in the movable arm control valve 300 ', and at the moment, oil required by the descending action of the movable arm is completely regenerated by the oil in the rodless cavity; when the movable arm descends to the ground contact of the working device, at the moment, the pressure of the rodless cavity is smaller than that of the rod cavity, the regeneration one-way valve 310 ' cannot be opened for regeneration, and oil output by the hydraulic pump 100 ' flows to the rod cavity of the movable arm oil cylinder 400 ' through the master one-way valve 200 ' and the movable arm control valve 300 ' in sequence to realize the operation of supporting the vehicle; when the boom needs to be raised, the boom control valve 300 'is switched to the right position, and the oil output from the hydraulic pump 100' flows to the rodless chamber of the boom cylinder 400 'through the master check valve 200' and the boom control valve 300 'in sequence to drive the piston rod of the boom cylinder 400' to extend, and at the same time, the oil in the rod chamber of the boom cylinder 400 'flows back to the oil tank 500'.
Although the boom oil return regeneration apparatus can regenerate oil before the working device is not in contact with the ground, the hydraulic pump 100 'supplies oil to the rod chamber of the boom cylinder 400' during this process, and hydraulic energy consumption is high.
Disclosure of Invention
The first object of the present invention is to provide a boom oil return regeneration control device, so as to solve the technical problem that hydraulic energy consumption is high in a boom lowering process of a boom oil return regeneration control device in the prior art.
The invention provides a movable arm oil return regeneration control device which comprises a movable arm control valve, wherein the movable arm control valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port is used for being communicated with a rod cavity of a movable arm oil cylinder, the second oil port is used for being communicated with a rodless cavity of the movable arm oil cylinder, the third oil port is used for being communicated with a hydraulic pump, and the fourth oil port is used for being communicated with an oil tank;
the boom control valve is configured to have a first state in which the first oil port and the second oil port are communicated through a regenerative check valve, the regenerative check valve is configured to be opened unidirectionally from the second oil port to the first oil port, the second oil port is communicated in a direction of the fourth oil port, and the first oil port, the second oil port, and the fourth oil port are all disconnected from the third oil port.
The movable arm oil return regeneration control device has the beneficial effects that:
after the boom oil return regeneration control device is connected with the corresponding hydraulic pump, boom cylinder and oil tank, the third oil port for communicating with the hydraulic pump is set to be disconnected with the other three oil ports in the first state, hydraulic oil in the rodless cavity of the hydraulic cylinder flows into the boom control valve through the second oil port, part of the hydraulic oil flows back into the rod cavity through the regeneration check valve and the first oil port, and part of the hydraulic oil flows back into the oil tank through the fourth oil port, and at the moment, because the third oil port is disconnected with the other oil ports, the hydraulic oil generated by the hydraulic pump does not need to flow into the boom control valve and further flows into the boom cylinder. Therefore, it is possible to reduce the work load of the hydraulic pump when the boom is lowered to reduce the hydraulic energy consumption existing during the lowering of the boom.
In an optional embodiment, the boom control valve is configured to further have a second state and a third state, wherein in the second state, the third port is communicated in the direction of the second port, and the first port is communicated in the direction of the fourth port; and in the third state, the third oil port is communicated towards the direction of the first oil port, and the second oil port is communicated towards the direction of the fourth oil port.
In an optional embodiment, the boom control valve further includes a fifth oil port and a sixth oil port, and the boom control valve is configured to further have a fourth state in which the first oil port, the second oil port, the third oil port and the fourth oil port are all disconnected from each other, and the fifth oil port is communicated with the sixth oil port;
in the first state, the fifth oil port is communicated with the sixth oil port;
in the second state, the fifth oil port is disconnected from other oil ports, and the sixth oil port is disconnected from other oil ports;
and in the third state, the fifth oil port is disconnected from other oil ports, and the sixth oil port is disconnected from other oil ports.
In an alternative embodiment, a boom-down pressure relief valve and a boom-up pressure relief valve are further included, the boom-down pressure relief valve being in communication with the first control end of the boom control valve, the boom-up pressure relief valve being in communication with the second control end of the boom control valve.
In an alternative embodiment, a controller for controlling the pressures of the boom-down relief valve and the boom-up relief valve is further included.
In an optional embodiment, the hydraulic cylinder further comprises a pressure sensor and a controller, the pressure sensor is located on a pipeline of the second oil port communicated with the hydraulic cylinder, and the pressure sensor is electrically connected with the controller.
In an optional embodiment, the valve further comprises a throttle valve, the throttle valve is arranged on a passage between the second oil port and the fourth oil port, and the throttle valve is located between a connection point of the check valve and the passage and the fourth oil port.
A second object of the present invention is to provide a control system, so as to solve the technical problem that hydraulic energy consumption is high in the boom return oil regeneration control device in the prior art during the boom descending process.
In a second aspect, the present invention provides a control system, including a boom cylinder, a hydraulic pump, an oil tank, and any one of the boom oil return regeneration control devices described above; the rod cavity of the movable arm oil cylinder is communicated with the first oil port, the rodless cavity of the movable arm oil cylinder is communicated with the second oil port, the hydraulic pump is communicated with the third oil port, and the oil tank is communicated with the fourth oil port.
The movable arm oil return regeneration control system has the beneficial effects that:
since the control system provided by the present invention includes any one of the boom oil return regeneration control devices, the technical effects of any one of the boom oil return regeneration control devices are achieved, and details are not described herein.
A third object of the present invention is to provide a control method, so as to solve the technical problem in the prior art that hydraulic energy consumption of an engineering machine is high during a boom descending process.
The control method provided by the invention uses the control system, and comprises the following steps:
when the boom is driven to descend and before the boom is not in contact with the ground, the boom control valve is in the first state, hydraulic oil in a rodless cavity of the boom cylinder enters the boom control valve through the second oil port, partially flows into a rod cavity of the boom cylinder from the first oil port through the regeneration one-way valve, and partially flows into the oil tank through the fourth oil port.
The control method of the invention has the following beneficial effects:
because the control method provided by the aspect uses any one of the boom oil return regeneration control systems, the technical effects that any one of the boom oil return regeneration control systems can produce in the using process are achieved, and the details are not repeated herein.
A fourth object of the present invention is to provide a construction machine, so as to solve the technical problem in the prior art that hydraulic energy consumption of the construction machine is high during a boom descending process.
The engineering machinery provided by the invention comprises the control system.
The engineering machinery of the invention has the following beneficial effects:
since the engineering machine provided by the present aspect includes the boom oil return regeneration control system according to any one of the above descriptions, the technical effect of the boom oil return regeneration control system according to any one of the above descriptions is achieved, and details are not repeated herein.
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 diagram of a boom oil return regeneration control apparatus provided in the prior art in a non-operating state of a boom cylinder;
fig. 2 is a schematic diagram of a boom oil return regeneration apparatus provided in the prior art in a working state of boom cylinder rodless chamber oil regeneration;
fig. 3 is a schematic diagram of a boom control valve of the boom oil return regeneration control apparatus according to the embodiment of the present invention in a fourth state;
fig. 4 is a schematic diagram of a boom control valve of the boom oil return regeneration control apparatus according to the embodiment of the present invention in a first state;
fig. 5 is a schematic diagram of a boom control valve of the boom oil return regeneration control apparatus according to the embodiment of the present invention in a third state;
fig. 6 is a schematic diagram of a boom control valve of the boom oil return regeneration control apparatus according to the embodiment of the present invention in a second state.
Reference numerals:
100' -a hydraulic pump; 200' -a main check valve; 300' -boom control valve; 400' -boom cylinder; 500' -oil tank; 310' -a regenerative check valve;
100-a hydraulic pump; 200-a main check valve; 300-a boom control valve; 400-a boom cylinder; 500-oil tank; 600-secondary one-way valves; 700-a pressure sensor; 800-a controller;
310-a regenerative check valve; 320-boom down relief valve; 330-boom-up-and-down valves; 340-a throttle valve;
a-a first oil port; b-a second oil port; p-a third oil port; t-a fourth oil port; c-a fifth oil port; d-a sixth oil port.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present 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.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, which are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "connected" is to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be directly connected or may be connected through an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The first embodiment is as follows:
fig. 3 is a schematic diagram of a boom control valve 300 of the boom oil returning and regenerating control apparatus according to the embodiment of the present invention in a fourth state.
The boom oil return regeneration control device provided by the embodiment includes a boom control valve 300, where the boom control valve 300 includes a first oil port a, a second oil port B, a third oil port P, and a fourth oil port T, where the first oil port a is used to communicate with a rod cavity of a boom cylinder 400, the second oil port B is used to communicate with a rodless cavity of the boom cylinder 400, the third oil port P is used to communicate with a hydraulic pump 100, and the fourth oil port T is used to communicate with an oil tank 500;
the boom control valve 300 is configured to have a first state in which the first port a and the second port B are communicated through the regenerative check valve 310, the regenerative check valve 310 is configured to be opened unidirectionally from the second port B to the first port a, the second port B is communicated in the direction of the fourth port T, and all three of the first port a, the second port B, and the fourth port T are disconnected from the third port P.
After the boom oil return regeneration control apparatus of the present embodiment is connected to the corresponding hydraulic pump 100, the boom cylinder 400, and the oil tank 500, by setting the third oil port P for communicating with the hydraulic pump 100 to be disconnected from the other three oil ports in the first state, the hydraulic oil in the rodless chamber of the boom cylinder 400 flows into the boom control valve 300 through the second oil port B, partially flows back into the rod chamber through the regeneration check valve 310 and the first oil port a, and partially flows back into the oil tank 500 through the fourth oil port T, and at this time, because the third oil port P is disconnected from the other oil ports, the hydraulic oil generated by the hydraulic pump 100 does not need to flow into the boom control valve 300 and further into the boom cylinder 400. Therefore, it is possible to reduce the workload of the hydraulic pump 100 when the boom is lowered to reduce the consumption of hydraulic energy existing during the lowering of the boom.
In an alternative embodiment, the boom control valve 300 is configured to further have a second state in which the third port P is communicated in the direction of the second port B and the first port a is communicated in the direction of the fourth port T; in the third state, the third port P is connected to the first port a, and the second port B is connected to the fourth port T.
By setting the second state and the third state to the communication mode, when the boom control valve 300 is in the third state after the work equipment connected to the boom contacts the ground, the rod chamber may be directly driven to expand, and the piston may move to the side of the rodless chamber to retract the piston rod, thereby realizing the operation of supporting the vehicle. When the boom control valve 300 is in the second state, hydraulic oil may be made to flow into the rodless chamber to push the piston rod to extend, so that the boom performs a corresponding operation.
In an alternative embodiment, the boom control valve 300 further includes a fifth port C and a sixth port D, and the boom control valve 300 is configured to further have a fourth state in which the first port a, the second port B, the third port P, and the fourth port T are all disconnected from each other, and the fifth port C is communicated with the sixth port D;
in the first state, the fifth oil port C is communicated with the sixth oil port D;
in the second state, the fifth oil port C is disconnected with other oil ports, and the sixth oil port D is disconnected with other oil ports;
in the third state, the fifth port C is disconnected from other ports, and the sixth port D is disconnected from other ports.
By providing the fifth port C and the sixth port D disconnected from the first port a, the second port B, the third port P, and the fourth port T, hydraulic oil may pass through the boom control valve 300 to serve other hydraulic actuating devices when the boom is not actively operated in, for example, the first state and the fourth state, thereby reducing the possibility of requiring additional valve configuration.
In an alternative embodiment, a boom-down relief valve 320 and a boom-up relief valve 330 are further included, the boom-down relief valve 320 being in communication with a first control end of the boom control valve 300, the boom-up relief valve 330 being in communication with a second control end of the boom control valve 300. Specifically, the boom-down pressure reducing valve 320 in the present embodiment is a boom-down proportional pressure reducing solenoid valve, and the boom-up pressure reducing valve 330 in the present embodiment is a boom-up proportional pressure reducing solenoid valve.
By providing the boom-down pressure reducing valve 320 and the boom-up pressure reducing valve 330, an acting force required for movement of a spool in the boom control valve 300 may be controlled, so that a hydraulic pressure level when a corresponding passage may be opened in the boom control valve 300 may be controlled to ensure that a pressure level required for a corresponding operation is an appropriate pressure level.
In an alternative embodiment, a controller 800 is further included, and the controller 800 is used to control the pressures of the boom-down pressure reducing valve 320 and the boom-up pressure reducing valve 330.
By providing the controller 800, the pressures of the boom-down pressure reducing valve 320 and the boom-up pressure reducing valve 330 may be controlled, so that the pressure in the boom cylinder 400 may be conveniently controlled.
In an alternative embodiment, a pressure sensor 700 is further included, the pressure sensor 700 is located on a pipeline where the second port B communicates with the boom cylinder 400, and the pressure sensor 700 is electrically connected to the controller 800.
The pressure sensor 700 is arranged to monitor the pressure of the rodless cavity, so that the information of the grounding of the working device can be obtained, and further, the state of the boom control valve 300 is switched by controlling the pressures of the boom-down pressure reducing valve 320 and the boom-up pressure reducing valve 330, so that the hydraulic oil provided by the oil pump enters the rod cavity of the boom cylinder 400, and the vehicle supporting action is realized.
In an alternative embodiment, a throttle valve 340 is further included, the throttle valve 340 is disposed on the passage between the second port B and the fourth port T, and the throttle valve 340 is located between the fourth port T and a connection point of the check valve and the passage.
By providing the throttle valve 340, the flow rate of the hydraulic oil flowing out from the fourth port T in the first state can be restricted. Since the piston movement between the rod chamber and the rodless chamber causes the trade-off between the rod chamber and the rodless chamber, and the trade-off is in fixed proportion, the flow rate of the hydraulic oil flowing out from the fourth port T is necessarily in fixed proportion to the flow rate of the hydraulic oil flowing in from the second port B. Therefore, the speed of the hydraulic oil flowing out of the fourth oil port T is limited, the speed of the hydraulic oil flowing into the second oil port B is also limited, the moving speed of the piston of the boom cylinder 400 is also limited, and the reduction of the service life of the part due to the fact that the boom descends too fast and the working device impacts the ground is prevented.
Example two:
as shown in fig. 3 to 6, the present embodiment provides a control system including a boom cylinder 400, a hydraulic pump 100, an oil tank 500, and any one of the boom oil returning regeneration control devices described above; a rod chamber of the boom cylinder 400 is communicated with the first port a, a rodless chamber of the boom cylinder 400 is communicated with the second port B, the hydraulic pump 100 is communicated with the third port P, and the oil tank 500 is communicated with the fourth port T. The hydraulic pump 100 may be connected to other hydraulic devices through the sub check valve 600.
Since the control system provided in this embodiment includes any one of the boom oil return regeneration control devices, the technical effect of any one of the boom oil return regeneration control devices is achieved, and details are not described herein.
Example three:
the control method provided by the embodiment uses the control system, and comprises the following steps:
when the boom is driven to descend and before the boom is not in contact with the ground, the boom control valve 300 is in the first state, and the hydraulic oil of the rodless chamber of the boom cylinder 400 enters the boom control valve 300 through the second port B, and partially flows into the rod chamber of the boom cylinder 400 from the first port a through the regeneration check valve 310, and partially flows into the oil tank 500 through the fourth port T.
Since the control method provided by this embodiment uses any one of the boom oil return regeneration control systems, the technical effects that any one of the boom oil return regeneration control systems can produce in the use process are achieved, and details are not described herein.
Specifically, the control method provided in this embodiment includes the following steps:
when the boom is raised, the control system is brought into the second state shown in fig. 6. Specifically, the first port a is communicated with the fourth port T, the second port B is communicated with the third port P, and the fifth port C and the sixth port D are both in a disconnected state from the other ports.
Hydraulic oil output from the hydraulic pump 100 flows into the third oil port P through the main check valve 200, and flows into the rodless chamber of the boom cylinder 400 through the second oil port B, and pushes the piston rod to move toward the rod chamber, and the hydraulic oil in the rod chamber enters the boom control valve 300 through the second oil port B, and flows back to the cylinder through the fourth oil port T, thereby completing the boom raising operation.
When the boom is lowered, the control system is brought to a first state as shown in fig. 4. Specifically, the second port B is communicated with the first port a through the regenerative check valve 310 on the one hand, and is communicated with the fourth port T through the throttle valve 340 on the other hand, the third port P is in a state of being disconnected from other ports, and the fifth port C is communicated with the sixth port D.
The piston rod of the boom cylinder 400 receives the gravity of the boom and the working devices thereon, and transmits the pressure to the piston and the hydraulic oil in the rodless chamber, which is higher than the pressure of the hydraulic oil in the rod chamber. For example, when the pressure sensor 700 monitors that the pressure in the rodless chamber is greater than or equal to 2MPa, the controller 800 outputs a corresponding current, so that the pilot pressure output by the boom-down pressure reducing valve 320 pushes the spool to the position of the first state. Therefore, the hydraulic oil in the rodless chamber of the boom cylinder 400 flows out of the rodless chamber, flows into the boom control valve 300 through the second oil port B, a portion of the hydraulic oil flows into the rod chamber through the regeneration check valve 310 and the first oil port a, and a portion of the hydraulic oil flows into the oil tank 500 through the throttle valve 340 and the fourth oil port T, thereby achieving the boom lowering operation. In addition, since the fifth port C and the sixth port D are still in a communicated state, the hydraulic oil in the hydraulic pump 100 at this time may be oil for other hydraulic components of the vehicle.
When it is desired to use the boom truck, the control system is brought to a third state shown in fig. 5. Specifically, in this state, the second port B is directly communicated with the fourth port T without connecting the throttle valve 340 in series, the first port a is communicated with the third port P, and the fifth port C and the sixth port D are disconnected from the other ports.
After the working device contacts the ground, the pressure of the rodless chamber of the boom cylinder 400 is decreased, the pressure sensor 700 monitors that the pressure of the rodless chamber is less than 2MPa, and the controller 800 outputs a corresponding current, so that the boom-down pressure reducing valve 320 pushes the spool to a position where the boom control valve 300 maintains the third state. Hydraulic oil output from the hydraulic pump 100 flows into the boom control valve 300 through the main check valve 200 and the third port P, and then flows into the rod chamber through the first port a. The hydraulic oil in the rodless chamber flows into the boom control valve 300 through the second oil port B, and then flows into the oil tank 500 through the fourth oil port T.
When it is desired to maintain the position of the boom, the control system is brought to a fourth state shown in fig. 3. Specifically, in the fourth state, except that the fifth port C is communicated with the sixth port D, all the other ports are not communicated with each other.
When it is necessary to keep the boom at a certain position, such as when the vehicle body is lifted by the boom or when the boom drives the working device to work at a certain position, since the first port a, the second port B, the third port P, and the fourth port T are not connected, the hydraulic oil in the boom cylinder 400 does not flow, so that the piston and the piston rod may stop at a certain position. And the fifth port C and the sixth port D are communicated, so that other hydraulic devices can use the hydraulic oil output by the hydraulic pump 100.
Example four:
the engineering machine provided by the embodiment comprises the control system.
Since the engineering machine provided by the embodiment includes the boom oil return regeneration control system according to any one of the above descriptions, the technical effect of the boom oil return regeneration control system according to any one of the above descriptions is achieved, and details are not repeated herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The movable arm oil return regeneration control device is characterized by comprising a movable arm control valve (300), wherein the movable arm control valve (300) comprises a first oil port (A), a second oil port (B), a third oil port (P) and a fourth oil port (T), the first oil port (A) is used for being communicated with a rod cavity of a movable arm oil cylinder (400), the second oil port (B) is used for being communicated with a rodless cavity of the movable arm oil cylinder (400), the third oil port (P) is used for being communicated with a hydraulic pump (100), and the fourth oil port (T) is used for being communicated with an oil tank (500);
the boom control valve (300) is configured to have a first state in which the first oil port (a) and the second oil port (B) are communicated through a regeneration check valve (310), the regeneration check valve (310) is configured to be opened unidirectionally from the second oil port (B) to the first oil port (a), the second oil port (B) is communicated in a direction of the fourth oil port (T), and the first oil port (a), the second oil port (B), and the fourth oil port (T) are all disconnected from the third oil port (P).
2. The boom oil return regeneration control apparatus according to claim 1, wherein the boom control valve (300) is configured to further have a second state in which the third port (P) is communicated in the direction of the second port (B) and the first port (a) is communicated in the direction of the fourth port (T); and in the third state, the third oil port (P) is communicated towards the first oil port (A), and the second oil port (B) is communicated towards the fourth oil port (T).
3. The boom oil return regeneration control apparatus according to claim 2, wherein the boom control valve (300) further includes a fifth oil port (C) and a sixth oil port (D), the boom control valve (300) is configured to further have a fourth state in which the first oil port (a), the second oil port (B), the third oil port (P), and the fourth oil port (T) are all disconnected from each other, and the fifth oil port (C) is communicated with the sixth oil port (D);
in the first state, the fifth oil port (C) is communicated with the sixth oil port (D);
in the second state, the fifth oil port (C) is disconnected from other oil ports, and the sixth oil port (D) is disconnected from other oil ports;
and in the third state, the fifth oil port (C) is disconnected from other oil ports, and the sixth oil port (D) is disconnected from other oil ports.
4. The boom return oil regeneration control apparatus according to any one of claims 1 to 3, further comprising a boom-down relief valve (320) and a boom-up relief valve (330), the boom-down relief valve (320) communicating with a first control end of the boom control valve (300), the boom-up relief valve (330) communicating with a second control end of the boom control valve (300).
5. The boom return regeneration control apparatus according to claim 4, further comprising a controller (800), the controller (800) being configured to control pressures of the boom-down relief valve (320) and the boom-up relief valve (330).
6. The boom oil return regeneration control device according to claim 5, further comprising a pressure sensor (700), wherein the pressure sensor (700) is located on a pipe of the second oil port (B) communicating with the boom cylinder (400), and the pressure sensor (700) is electrically connected to the controller (800).
7. The boom return regeneration control apparatus according to any one of claims 1 to 3, further comprising a throttle valve (340), the throttle valve (340) being provided on a passage between the second port (B) and the fourth port (T), the throttle valve (340) being located between a connection point of the check valve and the passage and the fourth port (T).
8. A control system characterized by comprising a boom cylinder (400), a hydraulic pump (100), an oil tank (500), and the boom oil return regeneration control device according to any one of claims 1 to 7; a rod cavity of the boom cylinder (400) is communicated with the first oil port (A), a rodless cavity of the boom cylinder (400) is communicated with the second oil port (B), the hydraulic pump (100) is communicated with the third oil port (P), and the oil tank (500) is communicated with the fourth oil port (T).
9. A control method characterized by using the control system of claim 8, comprising the steps of:
when the boom is driven to descend and before the boom is not in contact with the ground, the boom control valve (300) is in a first state, hydraulic oil of the rodless chamber of the boom cylinder (400) enters the boom control valve (300) through the second oil port (B), partially flows into the rod chamber of the boom cylinder (400) from the first oil port (a) through the regeneration check valve (310), and partially flows into the oil tank (500) through the fourth oil port (T).
10. A working machine, characterized by comprising a control system according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010289617.5A CN111456127B (en) | 2020-04-14 | 2020-04-14 | Boom oil return regeneration control device, control system, control method and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010289617.5A CN111456127B (en) | 2020-04-14 | 2020-04-14 | Boom oil return regeneration control device, control system, control method and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111456127A true CN111456127A (en) | 2020-07-28 |
| CN111456127B CN111456127B (en) | 2022-02-25 |
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| CN111456127B (en) | 2022-02-25 |
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