CN108691853A - A kind of device and method that gravitional force conversion recycles - Google Patents
A kind of device and method that gravitional force conversion recycles Download PDFInfo
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- CN108691853A CN108691853A CN201810735902.8A CN201810735902A CN108691853A CN 108691853 A CN108691853 A CN 108691853A CN 201810735902 A CN201810735902 A CN 201810735902A CN 108691853 A CN108691853 A CN 108691853A
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- reversal valve
- bit triplet
- accumulator group
- hydraulic
- piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G3/00—Other motors, e.g. gravity or inertia motors
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A kind of device that gravitional force conversion recycles, including:Two-bit triplet reversal valve I, two-bit triplet reversal valve II, two-bit triplet reversal valve III, two-bit triplet reversal valve IV, pressurized cylinder, reversal valve, check valve, piston accumulator group, shut-off valve, auxiliary gas cylinder or bladder type hydropneumatic accumulator group, lifting equipment hydraulic cylinder;It is characterized in that:The lifting chamber hydraulic fluid port of the hydraulic cylinder of lifting equipment is connected by sequence with two-bit triplet reversal valve I, two-bit triplet reversal valve II, check valve by circuit A, it is in parallel with piston accumulator group, it connects with two-bit triplet reversal valve IV, piston accumulator group is in parallel with auxiliary gas cylinder or bladder type hydropneumatic accumulator group, in parallel with the reversal valve of pressurized cylinder;Hydraulic oil after supercharged is directly incorporated into main system oil circuit through pressure piping C, participates in the stretching of the hydraulic cylinder of lifting equipment;It connects with auxiliary gas cylinder or bladder type hydropneumatic accumulator group the gas port of piston accumulator group;The oily port of piston accumulator group in parallel is connected with two-bit triplet reversal valve IV.
Description
Technical field
The present invention relates to recycling field of the hydraulic pressure class lifting means with energy in load decentralization process, specially one
The device and method that kind gravitional force conversion recycles.
Background technology
In oil gas field hydraulic pressure class lifting means, hydraulic energy-storing workover rig as a kind of energy-saving and emission-reduction novel workover rig
Warp has obtained the approval of oil field relevant departments, such as:" a kind of hydraulic energy accumulation petroleum workover rig ", the patent No.:91106336.6
It proposes hydraulic energy-accumulating concept, the gravitional force in going down process is converted to hydraulic energy and is utilized again, but never realize, it is existing
In so-called hydraulic energy-accumulating, only in main system a set of energy-storage system in parallel, completes going down process and neutralize other non-cutting times
The storage of energy output by pump in section, there is no complete mutually converting for gravitional force and hydraulic energy.Also hydraulic energy-accumulating has just been violated
The original intention of workover rig, only reduces installed power, the problem of avoiding " low load with strong power ", and energy saving purpose is not achieved,
Country is not met at present about energy-efficient principles and policies.
Invention content
The object of the present invention is to provide the device and methods that a kind of conversion of gravitional force recycles.Overcome above-mentioned prior art
The problem of existing energy loss, provides a kind of power-economizing method and auxiliary device for hydraulic lifting equipment.
The technical scheme is that be accomplished by the following way:
A kind of device that gravitional force conversion recycles, including:Two-bit triplet reversal valve I, two-bit triplet reversal valve II, two three
Logical reversal valve III, two-bit triplet reversal valve IV, pressurized cylinder, reversal valve, check valve, piston accumulator group, shut-off valve, auxiliary
Gas cylinder or bladder type hydropneumatic accumulator group, lifting equipment hydraulic cylinder;It is characterized in that:The lifting chamber hydraulic fluid port of the hydraulic cylinder of lifting equipment passes through
Lifting equipment hydraulic oil-returning pipeline A connects by sequence with two-bit triplet reversal valve I, two-bit triplet reversal valve II, check valve, with piston
Formula accumulator group is in parallel, connects with two-bit triplet reversal valve IV, piston accumulator group and auxiliary gas cylinder or bladder type hydropneumatic accumulator group
Parallel connection, it is in parallel with the reversal valve of pressurized cylinder;Hydraulic oil after supercharged is directly incorporated into main system oil circuit through pressure piping, participates in lifting
The stretching of the hydraulic cylinder of equipment;It connects with auxiliary gas cylinder or bladder type hydropneumatic accumulator group the gas port of piston accumulator group;In parallel
The oily port of piston accumulator group is connected with two-bit triplet reversal valve IV.
The hydraulic oil-returning pipe P of the hydraulic lifting equipment of the two-bit triplet reversal valve I, two-bit triplet reversal valve II go out
Mouthful, the outlet of the hydraulic oil-returning pipe B, two-bit triplet reversal valve IV of the hydraulic lifting equipment of two-bit triplet reversal valve III respectively with
Lifting equipment hydraulic oil-returning pipeline A is connected.
The piston accumulator group is composed of 1-30 piston accumulator in parallel;The auxiliary gas cylinder or
Bladder type hydropneumatic accumulator group assists gas cylinder or bladder type hydropneumatic accumulator to be composed by 1-30 in parallel or series, and the purpose is to according to liquid
The load condition of lifting equipment is pressed to be pressed into hydraulic oil by circuit B and two-bit triplet reversal valve two-bit triplet reversal valve IV to adjust
The pre-charging pressure of piston accumulator group and auxiliary gas cylinder or bladder type hydropneumatic accumulator group entirety closes correspondence after reaching desired pressure
Oily port shut-off valve, to achieve the effect that maximum conversion energy.
The piston accumulator group and auxiliary gas cylinder or bladder type hydropneumatic accumulator group, auxiliary gas cylinder can be by 1-40 bellows
It is replaced after accumulator parallel connection, realizes same function.
The pressurized cylinder is set as the bidirectional booster cylinder to be commutated by two-bit triplet reversal valve.
The auxiliary gas cylinder or the preliminary filling nitrogen pressure of bladder type hydropneumatic accumulator group are more than 4MPa.
A kind of method that gravitional force conversion recycles, it is characterised in that:It is recycled according to a kind of conversion of gravitional force
The gravitional force of device converts pipeline to realize:
When the descent of piston of lifting equipment hydraulic cylinder, the hydraulic oil of lifting equipment hydraulic oil-returning pipeline is through two-bit triplet reversal valve
I, two-bit triplet reversal valve II, check valve enter piston accumulator group, the piston stroking upward of piston accumulator group, lifting equipment
The gravitional force of load is converted to hydraulic energy and is stored in piston accumulator group, and the nitrogen of upper piston area is squeezed into auxiliary gas cylinder
Or bladder type hydropneumatic accumulator group, make the pressure rise of auxiliary gas cylinder or bladder type hydropneumatic accumulator group, when lifting equipment hydraulic cylinder piston uplink,
The IV commutations of two-bit triplet reversal valve, are connected pressurized cylinder pipeline, and hydraulic energy is by assisting gas cylinder or bellows in piston accumulator group
Pressurized cylinder reciprocating action is set to be pressurized under the pressure effect of accumulator group and under the action of reversal valve;Hydraulic oil warp after supercharged
The pressure piping of pressurized cylinder enters the main system oil circuit of lifting equipment, and the piston stroking upward of lifting equipment hydraulic cylinder completes storage storage
Gravitional force is converted into recycling for hydraulic energy, realizes lifting oil well pipe, avoids the damage of lower oil well pipe gravitional force
It loses, saves the hydraulic energy of lifting oil pipe.
Two-bit triplet reversal valve I and two three are equipped between the hydraulic cylinder and piston accumulator group of the lifting equipment
The outlet of logical reversal valve II, two-bit triplet reversal valve I meet lifting equipment hydraulic circuit P and two-bit triplet reversal valve II respectively, and two
The outlet of position three-way diverter valve II connects lifting equipment hydraulic oil-returning pipeline A and piston accumulator group respectively, when load acts on
When the pressure that lifting equipment hydraulic cylinder generates is less than the preliminary filling nitrogen pressure of piston accumulator group, two-bit triplet reversal valve II
Switching position is directly connected to lifting equipment hydraulic oil-returning pipeline, conversely, the direct switching positions of two-bit triplet reversal valve II pass through list
Enter piston accumulator group to valve.
Reversal valve is equipped between the piston type accumulation of energy group and pressurized cylinder, main function is existed according to hydraulic lifting equipment
When bill of lading root oil pipe, piston accumulator group and pressurized cylinder is connected, the pressure oil being stored in piston accumulator group is carried out
It is incorporated to main system after supercharging, completes the promotion of single oil pipe.
The principle of the invention and advantage are:
It, can will be in going down process by assisting gas cylinder or bladder type hydropneumatic accumulator group, piston accumulator group and the combination of pressurized cylinder group
Gravitional force when decentralization compresses the nitrogen of preliminary filling, in trip-out process, compressed nitrogen by acting on piston accumulator
Hydraulic oil extrusion is directly acted on pressurized cylinder by the piston acted in piston accumulator group, and pressurized cylinder exports high pressure liquid pressure oil
The hydraulic cylinder for injecting hydraulic lifting equipment lifts the single oil pipe to be gone into the well, and then reaches recycling for energy, avoids down
Oil well pipe gravitational potential loss of energy saves the hydraulic energy for lifting single oil pipe.
Description of the drawings:
The mounting structure schematic diagram of Fig. 1-present invention.
In figure, 1- two-bit triplet reversal valve I, 2- two-bit triplet reversal valve II, 3- two-bit triplet reversal valves III, 4- two
Three-way diverter valve IV, 5- pressurized cylinder, 6- reversal valves, 7- check valves, 8- piston accumulators group, 9- shut-off valves, 10- assist gas cylinder
Or bladder type hydropneumatic accumulator group, 11- lifting equipment hydraulic cylinders;A, B, P- lifting equipment hydraulic oil-returning pipeline, C- pressure pipings.
Specific implementation mode
Further to disclose technical scheme of the present invention, elaborated with reference to the accompanying drawings of the specification by embodiment:
A kind of device that gravitional force conversion recycles, including:Two-bit triplet reversal valve I 1, two-bit triplet reversal valve II 2,
Two-bit triplet reversal valve III 3, two-bit triplet reversal valve IV 4, pressurized cylinder 5, reversal valve 6, check valve 7, piston accumulator
Group 8, shut-off valve 9, auxiliary gas cylinder or bladder type hydropneumatic accumulator group 10, lifting equipment hydraulic cylinder 11;It is characterized in that:The liquid of lifting equipment
The lifting chamber hydraulic fluid port of cylinder pressure 11 is changed by lifting equipment hydraulic oil-returning pipeline A by sequence and two-bit triplet reversal valve I 1, two-bit triplet
It connects to valve II 2, check valve 7, it is in parallel with piston accumulator group 8, it connects with two-bit triplet reversal valve IV 4, piston type stores
Energy device group 8 is in parallel with auxiliary gas cylinder or bladder type hydropneumatic accumulator group 10, in parallel with the reversal valve 6 of pressurized cylinder 5;Hydraulic oil after supercharged
It is directly incorporated into main system oil circuit through pressure piping C, participates in the stretching of the hydraulic cylinder of lifting equipment;The gas of piston accumulator group 8
It connects with auxiliary gas cylinder or bladder type hydropneumatic accumulator group 10 port;The oily port of piston accumulator group 8 in parallel is changed with two-bit triplet
It is connected to valve IV 4.
Application process in practice is:Instantly when tubing string, when the descent of piston of lifting equipment hydraulic cylinder 11, lifting is set
The hydraulic oil of standby cylinder circuit A enters through two-bit triplet reversal valve I 1, two-bit triplet reversal valve II 2, check valve 7 lives
The gravitional force of plug accumulator group 8, the piston stroking upward of piston accumulator, lifting equipment load is converted to hydraulic energy storage
In piston accumulator, the nitrogen of upper piston area is squeezed into auxiliary gas cylinder or bladder type hydropneumatic accumulator group 10, makes auxiliary gas cylinder or capsule
The pressure rise of formula accumulator group 10, when bill of lading root oil pipe is docked with the upper end oil pipe of the tubing string of well head, lifting equipment
Hydraulic cylinder piston uplink, two-bit triplet reversal valve IV 4 commutate, and 5 pipeline of pressurized cylinder is connected, is converted in piston accumulator group 8
Hydraulic energy by keeping pressurized cylinder 5 past under the action of assisting the pressure effect of gas cylinder or bladder type hydropneumatic accumulator group 10 lower and reversal valve 6
Double action is pressurized;Hydraulic oil after supercharged enters the main hydraulic system of lifting equipment, lifting equipment hydraulic pressure through pressure piping C
The piston stroking upward of cylinder 11 completes storage storage gravitional force and is converted into recycling for hydraulic energy, realizes lifting oil pipe, avoid down
Oil well pipe gravitational potential loss of energy saves the hydraulic energy for lifting single oil pipe.A kind of dress that gravitional force conversion recycles
It sets, overcomes the problems, such as energy loss existing for prior art, a kind of power-economizing method and auxiliary device are provided for hydraulic lifting equipment.
Claims (9)
1. a kind of device that gravitional force conversion recycles, including:Two-bit triplet reversal valve I(1), two-bit triplet reversal valve II
(2), two-bit triplet reversal valve III(3), two-bit triplet reversal valve IV(4), pressurized cylinder(5), reversal valve(6), check valve(7), it is living
Plug accumulator group(8), shut-off valve(9), auxiliary gas cylinder or bladder type hydropneumatic accumulator group(10), lifting equipment hydraulic cylinder(11);It is special
Sign is:The hydraulic cylinder of lifting equipment(11)Lifting chamber hydraulic fluid port pass through lifting equipment hydraulic oil-returning pipeline(A)By sequence and two
Three-way diverter valve I(1), two-bit triplet reversal valve II(2), check valve(7)Series connection, with piston accumulator group(8)Parallel connection, with two
Position three-way diverter valve IV(4)Series connection, piston accumulator group(8)With auxiliary gas cylinder or bladder type hydropneumatic accumulator group(10)Parallel connection, with increasing
Cylinder pressure(5)Reversal valve(6)It is in parallel;Hydraulic oil after supercharged is through pressure piping(C)It is directly incorporated into main system oil circuit, participates in lifting
The stretching of the hydraulic cylinder of equipment;Piston accumulator group(8)Gas port and auxiliary gas cylinder or bladder type hydropneumatic accumulator group(10)Series connection;
Piston accumulator group in parallel(8)Oily port and two-bit triplet reversal valve IV(4)It is connected.
2. a kind of device that gravitional force conversion recycles according to claim 1, it is characterised in that:The two-bit triplet
Reversal valve I(1)Lifting equipment hydraulic oil-returning pipeline(P), two-bit triplet reversal valve II(2)Outlet, two-bit triplet reversal valve
III(3)Lifting equipment hydraulic oil-returning pipeline(B), two-bit triplet reversal valve IV(4)Outlet respectively with lifting equipment hydraulic pressure return
Oil pipe line(A)It is connected.
3. a kind of device that gravitional force conversion recycles according to claim 1, it is characterised in that:The piston type stores
It can device group(8), it is composed of 1-30 piston accumulator in parallel;The auxiliary gas cylinder or bladder type hydropneumatic accumulator group(10)By
1-30 auxiliary gas cylinder in parallel or bladder type hydropneumatic accumulator are composed, and are set by lifting according to the load condition of hydraulic lifting equipment
Standby hydraulic oil-returning pipeline(B)With two-bit triplet reversal valve two-bit triplet reversal valve IV(4)Indentation hydraulic oil carrys out regulating piston formula storage
It can device group(8)With auxiliary gas cylinder or bladder type hydropneumatic accumulator group(10)Whole pre-charging pressure closes correspondence after reaching desired pressure
Oily port shut-off valve(9), achieve the effect that maximum conversion energy.
4. a kind of device that gravitional force conversion recycles according to claim 1 or 3, it is characterised in that:The work
Plug accumulator group(8)With auxiliary gas cylinder or bladder type hydropneumatic accumulator group(10), can be by being replaced after 1-40 bladder type hydropneumatic accumulator parallel connection
Realize same function.
5. a kind of device that gravitional force conversion recycles according to claim 1, it is characterised in that:The pressurized cylinder
(5)It is set as the bidirectional booster cylinder to be commutated by two-bit triplet reversal valve.
6. a kind of device that gravitional force conversion recycles according to claim 1 or 4, it is characterised in that:Assist gas cylinder
Or bladder type hydropneumatic accumulator group(10)Preliminary filling nitrogen pressure be more than 4MPa.
7. a kind of method that gravitional force conversion recycles, it is characterised in that:It is recycled according to a kind of conversion of gravitional force
The gravitional force of device converts pipeline to realize:When lifting equipment hydraulic cylinder(11)Descent of piston when, lifting equipment hydraulic pressure
Oil return line(A)Hydraulic oil through two-bit triplet reversal valve I(1), two-bit triplet reversal valve II(2), check valve(7)Into piston
Formula accumulator group(8), piston accumulator group(8)Piston stroking upward, the gravitional force of lifting equipment load is converted to hydraulic energy
It is stored in piston accumulator group(8)Interior, the nitrogen of upper piston area is squeezed into auxiliary gas cylinder or bladder type hydropneumatic accumulator group(10), make auxiliary
Help gas cylinder or bladder type hydropneumatic accumulator group(10)Pressure rise, when lifting equipment hydraulic cylinder(11)When piston stroking upward, two-bit triplet changes
To valve IV(4)Pressurized cylinder is connected in commutation(5)Pipeline, piston accumulator group(8)Interior hydraulic energy is by assisting gas cylinder or bellows to store
It can device group(10)Pressure effect is lower and reversal valve(6)Under the action of make pressurized cylinder(5)Reciprocating action is pressurized;It is after supercharged
Hydraulic oil is through pressurized cylinder(5)Pressure piping(C)Into the main system oil circuit of lifting equipment, lifting equipment hydraulic cylinder(11)Work
It goes beyond the Great Wall, completes storage storage gravitional force and be converted into recycling for hydraulic energy, realize lifting oil well pipe, avoid lower oil well
Tubing string gravitational potential loss of energy, saves the hydraulic energy of lifting oil pipe.
8. a kind of method that gravitional force conversion recycles according to claim 1 or claim 7, it is characterised in that:The act
Rise the hydraulic cylinder of equipment(11)With piston accumulator group(8)Between be equipped with two-bit triplet reversal valve I(1)It commutates with two-bit triplet
Valve II(2), two-bit triplet reversal valve I(1)Outlet connect lifting equipment hydraulic circuit respectively(P)With two-bit triplet reversal valve II
(2), two-bit triplet reversal valve II(2)Outlet connect lifting equipment hydraulic oil-returning pipeline respectively(A)With piston accumulator group
(8), when load acts on lifting equipment hydraulic cylinder(11)The pressure of generation is less than piston accumulator group(8)Preliminary filling nitrogen pressure
When power, two-bit triplet reversal valve II(2)Switching position is directly connected to lifting equipment hydraulic oil-returning pipeline, conversely, two-bit triplet changes
To valve II(2)Direct switching position passes through check valve(7)Into piston accumulator group(8).
9. a kind of method that gravitional force conversion recycles according to claim 7, it is characterised in that:The piston type
Accumulation of energy group(8)And pressurized cylinder(5)Between be equipped with reversal valve(6), main function is according to hydraulic lifting equipment in bill of lading root oil pipe
When, piston accumulator group is connected(8)And pressurized cylinder(5), to being stored in piston accumulator group(8)In pressure oil increased
It is incorporated to main system after pressure, completes the promotion of single oil pipe.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810735902.8A CN108691853A (en) | 2018-07-06 | 2018-07-06 | A kind of device and method that gravitional force conversion recycles |
| CN201910442395.3A CN110067790A (en) | 2018-07-06 | 2019-05-25 | A kind of device and method that gravitional force conversion recycles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810735902.8A CN108691853A (en) | 2018-07-06 | 2018-07-06 | A kind of device and method that gravitional force conversion recycles |
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| Publication Number | Publication Date |
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| CN108691853A true CN108691853A (en) | 2018-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810735902.8A Pending CN108691853A (en) | 2018-07-06 | 2018-07-06 | A kind of device and method that gravitional force conversion recycles |
| CN201910442395.3A Pending CN110067790A (en) | 2018-07-06 | 2019-05-25 | A kind of device and method that gravitional force conversion recycles |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910442395.3A Pending CN110067790A (en) | 2018-07-06 | 2019-05-25 | A kind of device and method that gravitional force conversion recycles |
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| CN (2) | CN108691853A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281877A (en) * | 2018-12-12 | 2019-01-29 | 燕山大学 | A kind of high pressure accumulator and its control method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594262A (en) * | 2020-12-16 | 2021-04-02 | 徐州徐工挖掘机械有限公司 | Energy recovery system for construction machine and construction machine |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741755B (en) * | 2013-10-17 | 2015-09-23 | 南京工业大学 | Excavator energy recovery system |
| CN103615443B (en) * | 2013-12-03 | 2016-04-06 | 三一汽车制造有限公司 | A kind of energy recovery hydraulic system and engineering machinery |
| US9702118B2 (en) * | 2014-11-19 | 2017-07-11 | Caterpillar Inc. | Hydraulic regenerative and recovery parasitic mitigation system |
| CN104452850B (en) * | 2014-12-16 | 2017-05-31 | 山河智能装备股份有限公司 | Method and its control device that a kind of excavator swing arm potential energy is recycled |
| CN104514759A (en) * | 2014-12-30 | 2015-04-15 | 天津福云天翼科技有限公司 | High-flow separating accumulator group constant pressure regulating system |
| CN106321567A (en) * | 2015-06-29 | 2017-01-11 | 苏州盛恒兴自动化设备有限公司 | Method and implementation device for storing extra energy of hydraulic transmission system on line |
| JP6509651B2 (en) * | 2015-06-29 | 2019-05-08 | イーグル工業株式会社 | Fluid circuit |
| CN206467707U (en) * | 2016-08-31 | 2017-09-05 | 徐州徐工挖掘机械有限公司 | A kind of excavator energy regenerating and utilize system |
| CN107061377B (en) * | 2017-03-30 | 2018-07-17 | 徐州工业职业技术学院 | A kind of heavy duty lifting electrohydraulic control system |
| CN207161399U (en) * | 2017-08-01 | 2018-03-30 | 油威力液压科技股份有限公司 | A kind of potential energy reclaims hydraulic means |
-
2018
- 2018-07-06 CN CN201810735902.8A patent/CN108691853A/en active Pending
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2019
- 2019-05-25 CN CN201910442395.3A patent/CN110067790A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281877A (en) * | 2018-12-12 | 2019-01-29 | 燕山大学 | A kind of high pressure accumulator and its control method |
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| CN110067790A (en) | 2019-07-30 |
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