CN114688111A - Gravitational potential energy recovery hydraulic system and excavator - Google Patents
Gravitational potential energy recovery hydraulic system and excavator Download PDFInfo
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- CN114688111A CN114688111A CN202210323611.4A CN202210323611A CN114688111A CN 114688111 A CN114688111 A CN 114688111A CN 202210323611 A CN202210323611 A CN 202210323611A CN 114688111 A CN114688111 A CN 114688111A
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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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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
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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
- 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
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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
- F15B21/14—Energy-recuperation means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention discloses a gravitational potential energy recovery hydraulic system and an excavator, wherein the gravitational potential energy recovery hydraulic system comprises: an oil tank; the hydraulic cylinder lifts the weight when the pressure oil is introduced into the first oil chamber, and lowers the weight when the pressure oil is introduced into the second oil chamber; a hydraulic pump; the energy-saving valve comprises a first oil port connected with the second oil cavity and a second oil port connected with the oil tank, a hydraulic control end is communicated with an energy-saving pipeline between the first oil port and the second oil cavity, the first oil port and the second oil port are disconnected at the first valve position, the first oil port and the second oil port are connected through a throttling hole at the second valve position, and the first oil port and the second oil port are communicated at the third valve position; and the reversing valve is provided with a third oil port connected with the first oil cavity, a fourth oil port connected with the second oil cavity, a fifth oil port connected with the oil tank, a sixth oil port connected with the first oil port and a seventh oil port connected with the hydraulic pump, and in the fifth valve position, the third oil port is communicated with the sixth oil port and the fourth oil port is communicated with the seventh oil port.
Description
Technical Field
The invention relates to the technical field of energy conservation of engineering machinery, in particular to a gravitational potential energy recovery hydraulic system and an excavator.
Background
In a construction machine, a hydraulic cylinder is often used for controlling lifting, descending, upward swinging, downward swinging and the like of some components, wherein some components are weights with larger mass, the gravity center of the weights descends in the moving descending or swinging descending process, the reduction of gravitational potential energy is larger, and the recovery of the gravitational potential energy of some weights in the descending process is of great significance for energy conservation. For example, basic operations of an excavator include swing up and swing down of a boom, swing up and swing down of an arm, inward and outward swinging of a bucket, and the like, in which the mass of the boom and the arm is large, the number of operations of the arm is large, the frequency of swing down is high, and it is worth studying on the recovery of gravitational potential energy of the arm during the swing down process.
Disclosure of Invention
The invention aims to provide a gravitational potential energy recovery hydraulic system capable of recovering gravitational potential energy of a descending heavy object.
The present invention discloses in a first aspect a gravitational potential energy recovery hydraulic system for lifting and lowering a heavy object, comprising:
an oil tank;
the hydraulic cylinder is used for being connected with the weight and comprises a piston rod, a cylinder barrel, a first oil cavity and a second oil cavity, wherein the first oil cavity and the second oil cavity are formed between the piston rod and the cylinder barrel;
the hydraulic pump is connected with the oil tank and used for pumping pressure oil to the hydraulic cylinder;
the energy-saving valve comprises a first oil port connected with the second oil cavity, a second oil port connected with the oil tank, and a hydraulic control end and a spring end which are positioned at two ends of the valve position and used for controlling the valve position of the energy-saving valve, wherein the hydraulic control end is communicated with an energy-saving pipeline between the first oil port and the second oil cavity, the energy-saving valve is provided with a first valve position, a second valve position and a third valve position, the first oil port is disconnected with the second oil port at the first valve position, the first oil port is connected with the second oil port through a throttling hole at the second valve position, the first oil port is communicated with the second oil port at the third valve position, when the oil pressure of the hydraulic control end is smaller than a first pressure, the energy-saving valve is positioned at the first valve position, when the oil pressure of the hydraulic control end is larger than the first pressure and smaller than a second pressure, the energy-saving valve is positioned at the second valve position, and when the oil pressure of the hydraulic control end is larger than the second pressure, the energy-saving valve is in a third valve position;
the reversing valve is provided with a third oil port connected with the first oil cavity, a fourth oil port connected with the second oil cavity, a fifth oil port connected with the oil tank, a sixth oil port connected with the first oil port and a seventh oil port connected with the hydraulic pump, the reversing valve is provided with a fourth valve position and a fifth valve position, the fourth valve position is provided with the third oil port communicated with the seventh oil port and the fourth oil port communicated with the fifth oil port, and the fifth valve position is provided with the third oil port communicated with the sixth oil port and the fourth oil port communicated with the seventh oil port.
In some embodiments, the energy-saving device further comprises a check valve, the check valve is arranged between the first oil port and the connection point of the hydraulic control end and the energy-saving pipeline, and the opening of the check valve faces the connection point of the hydraulic control end and the energy-saving pipeline.
In some embodiments, the cracking pressure of the opening of the one-way valve is adjustable.
In some embodiments, the reversing valve further has a sixth valve position in which the third port, the fourth port, the fifth port, and the sixth port are all disconnected.
In some embodiments, the piston rod is connected to the weight, the first oil chamber is a rod chamber, and the second oil chamber is a rodless chamber.
In a second aspect of the present invention, an excavator is disclosed, which includes an arm and any one of the gravitational potential energy recovery hydraulic systems, the piston rod is connected to the arm, when the directional control valve is switched to the fifth valve position, the hydraulic pump pumps pressure oil to the second oil chamber, the arm swings down, the energy-saving valve is in the first valve position in a first time period from t1 after the arm starts to swing down, the energy-saving valve is in the second valve position in a second time period from t1 to t2, and the energy-saving valve is in the third valve position in a third time period greater than t2, where t2 is greater than t 1.
Based on the gravitational potential energy recovery hydraulic system provided by the invention, an energy-saving valve with a plurality of valve positions and hydraulic control ends is connected between a hydraulic cylinder and an oil tank, when the valve position of a switching reversing valve pumps pressure oil into a second oil chamber to lower a weight, the weight drives a piston rod or a cylinder barrel connected with the weight to move at the beginning stage, so that the first oil chamber is reduced, the oil pressure in the second oil chamber is low, the pressure oil formed in the first oil chamber completely flows into the second oil chamber through the energy-saving valve at the first valve position, so that the second oil chamber can quickly feed oil, the gravitational potential energy of the weight is recovered, after a period of time and the oil pressure in the second oil chamber is raised, the energy-saving valve is switched to the second valve position, the pressure oil flowing out of the first oil chamber is partially discharged into the oil tank through a throttling hole, and partially flows back into the second oil chamber to be recovered, and at the last stage, the oil pressure in the second oil chamber is high, the energy-saving valve is switched to a third valve position, and all hydraulic oil in the first oil cavity flows out to the oil tank. The gravitational potential energy recovery hydraulic system can recover the gravitational potential energy when the weight descends reasonably and coordinately according to the oil pressure in the second oil cavity.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a hydraulic schematic diagram of a gravitational potential energy recovery hydraulic system according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. 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 discussed further in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the gravitational potential energy recovery hydraulic system of the present embodiment is used to raise and lower a heavy object, where the gravity center of the heavy object is raised or lowered, the gravitational potential energy of the heavy object is increased or decreased, and the lifting and lowering of the heavy object may be performed in a moving manner or in a swinging manner, that is, the heavy object may be in a moving lifting and moving lowering manner, or in a swinging lifting or swinging lowering manner.
As shown in fig. 1, the gravitational potential energy recovery hydraulic system includes an oil tank 1, a hydraulic cylinder 4, a hydraulic pump 2, an energy saving valve 3, and a direction change valve 5.
The hydraulic cylinder 4 is used for connecting with a heavy object, the hydraulic cylinder 4 comprises a piston rod 42, a cylinder 41, a first oil chamber 43 and a second oil chamber 44 which are formed between the piston rod 42 and the cylinder 41, when the first oil chamber 43 is filled with pressure oil, the hydraulic cylinder 4 drives the heavy object to be lifted, and when the second oil chamber 44 is filled with pressure oil, the heavy object is descended. I.e. the hydraulic cylinder 4 may be connected to the weight by means of a piston rod 42 or to the weight by means of a cylinder 41. The piston rod 42 may be a single rod type piston rod as shown in fig. 1, and then one of the corresponding first and second oil chambers 43 and 44 is a rod chamber, and the other is a rodless chamber. In some embodiments not shown, the piston rod 42 may also be a two-rod piston rod, and the corresponding first and second oil chambers 43 and 44 are each a rodless chamber. When the first oil chamber 43 is filled with pressure oil, the pressure oil drives the piston rod 42 and the cylinder 41 to generate relative movement, so that a heavy object connected with the piston rod 42 or the cylinder 41 is driven to lift. When the second oil chamber 44 is filled with pressure oil, at the beginning stage, the oil discharge path of the first oil chamber 43 is communicated, the heavy object drives the cylinder 41 or the piston rod 42 connected with the heavy object to move relative to the piston rod 42 or the cylinder 41, the first oil chamber 43 is reduced, and the hydraulic oil flows out. The reversing valve is used for switching valve positions to control the pressure oil pumped by the hydraulic pump 2 to be communicated into the second oil chamber 44 or the first oil chamber 43.
The hydraulic pump 2 is connected to the oil tank 1, and the hydraulic pump 2 is configured to supply pressure oil for operation of the hydraulic cylinder 4.
The energy-saving valve 3 comprises a first oil port a connected with the second oil chamber 44, a second oil port b connected with the oil tank 1, and a hydraulic control end and a spring end which are used for controlling the valve position of the energy-saving valve 3 and are positioned at the two ends of the energy-saving valve, and the hydraulic control end of the energy-saving valve 3 is communicated with the energy-saving pipeline 8 between the first oil port a and the second oil chamber 44. The energy-saving valve 3 has a first valve position, a second valve position, and a third valve position, and in the first valve position, the first oil port a and the second oil port b are disconnected, that is, the first oil port a and the second oil port b are not conducted at this time. In the second valve position, the first oil port a and the second oil port b are connected through the throttle hole, that is, at this time, the first oil port a and the second oil port b are communicated, but there is pressure loss between the first oil port a and the second oil port b. In the third valve position, the first oil port a is communicated with the second oil port b, namely, at the moment, no pressure loss or small pressure loss is conducted between the first oil port a and the second oil port b. The switching of the valve position of the energy-saving valve 3 is controlled by the hydraulic control end and the spring end, when the pressure of the hydraulic control end is greater than the pressure of the spring end, the valve core of the energy-saving valve 3 moves, and when the valve core moves for a certain displacement, the valve position of the energy-saving valve 3 is switched. When the oil pressure of the hydraulic control end is smaller than the first pressure, the energy-saving valve 3 is located at the first valve position, when the oil pressure of the hydraulic control end is larger than the first pressure and smaller than the second pressure, the energy-saving valve 3 is located at the second valve position, when the oil pressure of the hydraulic control end is larger than the second pressure, the energy-saving valve 3 is located at the third valve position, and the magnitude of the first pressure and the magnitude of the second pressure are determined by the rigidity and the deformation of a spring at the spring end.
The directional control valve 5 has a third port c connected to the first oil chamber 43, a fourth port d connected to the second oil chamber 44, a fifth port e connected to the oil tank 1, a sixth port f connected to the first port a, and a seventh port g connected to the hydraulic pump 2. The reversing valve 5 has a fourth valve position and a fifth valve position, in the fourth valve position, the third oil port c is communicated with the seventh oil port g, the fourth oil port d is communicated with the fifth oil port e, at this time, the pressure oil pumped by the hydraulic pump 2 enters the third oil port c through the seventh oil port g and enters the first oil chamber 43 through the third oil port c, the hydraulic oil in the second oil chamber 44 enters the fifth oil port e through the fourth oil port d and enters the oil tank 1 through the fifth oil port e, and the hydraulic cylinder 4 drives the weight to lift.
When the reversing valve 5 is switched to the fifth valve position, the third oil port c is communicated with the sixth oil port f, the fourth oil port d is communicated with the seventh oil port g, the pressure oil pumped by the hydraulic pump 2 enters the fourth oil port d through the seventh oil port g and enters the second oil chamber 44 through the fourth oil port d, the weight enters the descending mode, the weight drives the first oil chamber 43 to contract to generate pressure oil when beginning to descend, the pressure oil generated by the first oil chamber 43 enters the sixth oil port f through the third oil port c and enters the first oil port a through the sixth oil port f, because the pressure oil pressure in the second oil chamber 44 is small at the beginning stage, the pressure of the pressure oil in the energy-saving pipeline 8 is small and smaller than the first pressure, the energy-saving valve 3 is at the first valve position, the first oil port a is not communicated with the second oil port b, the pressure oil in the first oil port a flows into the second oil chamber 44, namely, the pressure oil discharged from the first oil chamber 43 at this time completely enters the second oil chamber 44, the gravitational potential of the falling weight is recovered and the pressurized oil in the second oil chamber 44 is replenished more quickly, which also helps prevent "blow-up" of the second oil chamber 44. After descending for a period of time, the oil pressure in the second oil chamber 44 is increased, when the oil pressure in the energy-saving pipeline 8 is greater than the first pressure, the energy-saving valve 3 is switched to the second valve position, the part of the pressure oil discharged from the first oil chamber 43 enters the first oil port a and enters the second oil port b through the orifice, then the pressure oil returns to the oil tank from the second oil port b, the other part of the pressure oil enters the energy-saving pipeline 8 and enters the second oil chamber 44, the pressure of the pressure oil discharged from the first oil chamber 43 is closer to the pressure of the pressure oil in the second oil chamber 44 at the moment, the first oil port a and the second oil port b communicated by the orifice can reasonably distribute one part of the pressure oil discharged from the first oil chamber 43 to enter the second oil chamber for recycling, and the other part of the pressure oil enters the oil tank 1 for discharging, so that energy is reasonably and effectively saved. When the heavy object continues to descend for a period of time, the oil pressure in the second oil chamber 44 continues to increase, when the oil pressure in the energy-saving pipeline 8 is greater than the second pressure, the energy-saving valve 3 is switched to the third valve position, the pressure oil discharged from the first oil chamber 43 enters the first oil port a and then completely enters the second oil port b, at this time, in order to enable the heavy object to descend at a reasonable speed, if the hydraulic oil discharged from the first oil chamber 43 continues to enter the second oil chamber 44, energy is not saved enough, and at this time, the oil pressure in the first oil chamber 43 is directly discharged into the oil tank 1.
In the hydraulic system for recovering gravitational potential energy of the embodiment, the energy-saving valve 3 with a plurality of valve positions and hydraulic control ends is arranged and connected between the hydraulic cylinder 4 and the oil tank 1, when the valve position of the switching reversing valve 5 pumps pressure oil into the second oil chamber 44 to lower a heavy object, the heavy object drives the piston rod 42 or the cylinder 41 connected with the heavy object to move at the beginning stage, so that the first oil chamber 43 is reduced, the oil pressure in the second oil chamber 44 is low, the pressure oil formed in the first oil chamber 43 completely flows into the second oil chamber 44 through the energy-saving valve 3 at the first valve position, so that the second oil chamber 44 can quickly feed oil to recover the gravitational potential energy of the heavy object, after a period of time, the oil pressure in the second oil chamber 44 is increased, the energy-saving valve 3 is switched to the second valve position, the pressure oil flowing out of the first oil chamber 43 is divided into the oil tank 1 by the throttling hole, and part of the pressure oil flows back into the second oil chamber 44 to be recovered, in the final stage, the oil pressure in the second oil chamber 44 is high, the energy saving valve 3 is switched to the third valve position, and the hydraulic oil in the first oil chamber 43 flows out to the oil tank 1. The gravitational potential energy recovery hydraulic system enables a reasonably coordinated recovery of the gravitational potential energy as the weight descends, depending on the oil pressure in the second oil chamber 44.
In some embodiments, as shown in fig. 1, the hydraulic system for recovering gravitational potential energy further includes a check valve 7, the check valve 7 is disposed between the first oil port a and a connection point 81 between the pilot-controlled end and the economizer line 8, and an opening of the check valve 7 faces the connection point between the pilot-controlled end and the economizer line 8. When the heavy object descends, the one-way valve 7 is arranged to prevent the hydraulic oil in the second oil chamber 44 from flowing back to the first oil chamber 43, so that the energy-saving effect is improved, and meanwhile, when the energy-saving valve 4 is in the first valve position, the one-way valve 7 needs to be opened first before the hydraulic oil discharged from the first oil chamber 43 enters the second oil chamber 44, and then the hydraulic oil enters the second oil chamber 44 through the one-way valve 7, namely, the pressure oil discharged from the first oil chamber 43 needs to be larger than the opening pressure of the one-way valve 7 and then can enter the second oil chamber 44. In some embodiments the opening pressure of the opening of the non return valve 7 is adjustable, in some embodiments the energy saving valve 3 comprises a non return valve 7, i.e. the non return valve 7 may be integrated in the energy saving valve 3.
In some embodiments, the economizer valve 3 is a proportional control valve.
In some embodiments, as shown in fig. 1, the directional valve 5 further has a sixth valve position in which the third port c, the fourth port d, the fifth port e, and the sixth port f are all disconnected. At this time, the first oil chamber 43 and the second oil chamber 44 of the hydraulic cylinder are both in a closed state, and the weight holding position is locked.
In some embodiments, the piston rod 42 is connected to the weight, the first oil chamber 43 is a rod chamber, and the second oil chamber 44 is a rodless chamber.
In some embodiments, the directional control valve 5 is a hydraulic control directional control valve, and the directional control valve 5 includes two hydraulic control ends, which are respectively connected to the handle control valve 6, and the valve position of the directional control valve 5 is controlled by two handles of the handle control valve. In some embodiments, the directional valve 5 is part of a multiplex valve.
In some embodiments, an excavator is further disclosed, the excavator comprises an arm and any one of the above gravitational potential energy recovery hydraulic systems, the piston rod 42 is connected with the arm, when the reversing valve 5 is switched to the fifth valve position, the hydraulic pump 2 pumps pressure oil to the second oil chamber 44, the arm swings and descends, the energy-saving valve 3 is in the first valve position in a first time period from t1 after the arm starts to swing and descend, the energy-saving valve 3 is in the second valve position in a second time period from t1 to t2, and the energy-saving valve 3 is in the third valve position in a third time period greater than t2, wherein t2 is greater than t 1.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (6)
1. A gravitational potential energy recovery hydraulic system for lifting and lowering a heavy object, comprising:
an oil tank;
the hydraulic cylinder is used for being connected with the weight and comprises a piston rod, a cylinder barrel, a first oil cavity and a second oil cavity, wherein the first oil cavity and the second oil cavity are formed between the piston rod and the cylinder barrel;
the hydraulic pump is connected with the oil tank and used for pumping pressure oil to the hydraulic cylinder;
the energy-saving valve comprises a first oil port connected with the second oil cavity, a second oil port connected with the oil tank, and a hydraulic control end and a spring end which are positioned at two ends of the valve position and used for controlling the valve position of the energy-saving valve, wherein the hydraulic control end is communicated with an energy-saving pipeline between the first oil port and the second oil cavity, the energy-saving valve is provided with a first valve position, a second valve position and a third valve position, the first oil port is disconnected with the second oil port at the first valve position, the first oil port is connected with the second oil port through a throttling hole at the second valve position, the first oil port is communicated with the second oil port at the third valve position, when the oil pressure of the hydraulic control end is smaller than a first pressure, the energy-saving valve is positioned at the first valve position, when the oil pressure of the hydraulic control end is larger than the first pressure and smaller than a second pressure, the energy-saving valve is positioned at the second valve position, and when the oil pressure of the hydraulic control end is larger than the second pressure, the energy-saving valve is in a third valve position;
the reversing valve is provided with a third oil port connected with the first oil cavity, a fourth oil port connected with the second oil cavity, a fifth oil port connected with the oil tank, a sixth oil port connected with the first oil port and a seventh oil port connected with the hydraulic pump, the reversing valve is provided with a fourth valve position and a fifth valve position, the fourth valve position is provided with the third oil port communicated with the seventh oil port and the fourth oil port communicated with the fifth oil port, and the fifth valve position is provided with the third oil port communicated with the sixth oil port and the fourth oil port communicated with the seventh oil port.
2. The gravitational potential energy recovery hydraulic system of claim 1, further comprising a check valve disposed between the first oil port and the connection point of the hydraulic control end and the economizer line, and having an opening facing the connection point of the hydraulic control end and the economizer line.
3. The gravitational potential energy recovery hydraulic system of claim 2, wherein an opening pressure of the opening of the check valve is adjustable.
4. The gravitational potential energy recovery hydraulic system of claim 1, wherein the directional control valve further has a sixth valve position in which the third port, the fourth port, the fifth port, and the sixth port are all disconnected.
5. The gravitational potential energy recovery hydraulic system of claim 1, wherein the piston rod is coupled to the weight, the first oil chamber is a rod chamber, and the second oil chamber is a rodless chamber.
6. An excavator comprising a boom and the hydraulic system for gravitational potential energy recovery according to any one of claims 1 to 5, wherein the piston rod is connected to the boom, when the directional control valve is switched to the fifth valve position, the hydraulic pump pumps pressure oil to the second oil chamber, the boom swings down, the energy-saving valve is in the first valve position during a first time period from t1 after the boom starts to swing down, the energy-saving valve is in the second valve position during a second time period from t1 to t2, and the energy-saving valve is in the third valve position during a third time period greater than t2, wherein t2 is greater than t 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210323611.4A CN114688111A (en) | 2022-03-30 | 2022-03-30 | Gravitational potential energy recovery hydraulic system and excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210323611.4A CN114688111A (en) | 2022-03-30 | 2022-03-30 | Gravitational potential energy recovery hydraulic system and excavator |
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| Publication Number | Publication Date |
|---|---|
| CN114688111A true CN114688111A (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210323611.4A Pending CN114688111A (en) | 2022-03-30 | 2022-03-30 | Gravitational potential energy recovery hydraulic system and excavator |
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| CN (1) | CN114688111A (en) |
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- 2022-03-30 CN CN202210323611.4A patent/CN114688111A/en active Pending
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